CN111628479A - Over-temperature protection circuit, chip integrated module, control circuit and lighting device - Google Patents
Over-temperature protection circuit, chip integrated module, control circuit and lighting device Download PDFInfo
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- CN111628479A CN111628479A CN202010573189.9A CN202010573189A CN111628479A CN 111628479 A CN111628479 A CN 111628479A CN 202010573189 A CN202010573189 A CN 202010573189A CN 111628479 A CN111628479 A CN 111628479A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
本发明公开提供一种过温保护电路、芯片集成模块、控制电路及照明装置。本发明的过温保护电路中，相对现有技术需要分别设置两个引脚、两个电信号输入端，本发明的过温保护电路中过温保护触发模块和斜率确定模块共同连接一个电信号输入端，从而使得过温保护电路的输入端数量减少。因此，在将该过温保护电路组设成为芯片集成模块的一部分后，能够减少芯片集成模块的引脚数量。
The invention discloses and provides an over-temperature protection circuit, a chip integrated module, a control circuit and a lighting device. In the over-temperature protection circuit of the present invention, compared with the prior art, two pins and two electrical signal input terminals need to be set respectively, and the over-temperature protection trigger module and the slope determination module in the over-temperature protection circuit of the present invention are jointly connected to an electrical signal input terminals, thereby reducing the number of input terminals of the over-temperature protection circuit. Therefore, the number of pins of the chip integrated module can be reduced after the over-temperature protection circuit group is provided as a part of the chip integrated module.
Description
Technical Field
The application relates to the technical field of chip integration, in particular to an over-temperature protection circuit, a chip integrated module, a control circuit and a lighting device.
Background
The over-temperature protection is an important protection function in circuit application, and products with over-temperature protection requirements can design corresponding over-temperature protection circuits.
In an existing chip integrated module, in order to have an over-temperature protection function and determine a slope of a temperature-current/voltage curve after triggering the over-temperature protection, two pins need to be arranged on the chip integrated module, the two pins are respectively connected with an over-temperature protection triggering module and a slope determining module in the chip integrated module, the over-temperature protection triggering module is used for judging whether the over-temperature protection function is triggered or not for a first electrical signal input from one pin, and the slope determining module is used for determining the slope of the temperature-current/voltage curve for a second electrical signal input from the other pin.
Therefore, in the chip integrated module in the prior art, a large number of pins in the chip integrated module need to be occupied in order to realize the over-temperature protection function.
Disclosure of Invention
The invention discloses an over-temperature protection circuit, which aims to solve the technical problem that in a chip integrated module in the prior art, more pins of the chip integrated module are required to be occupied for realizing an over-temperature protection function. In addition, the invention also provides a chip integrated module, a control circuit and a lighting device.
In order to solve the problems, the invention adopts the following technical scheme:
in a first aspect, an over-temperature protection circuit is provided, including: the over-temperature protection device comprises an electric signal input end, an over-temperature protection triggering module and a slope determining module;
the electric signal input end is used for receiving a parameter setting electric signal;
the over-temperature protection triggering module is provided with an input end and an output end, the input end of the over-temperature protection triggering module is connected with the electric signal input end, and when the over-temperature protection function of the over-temperature protection triggering module is triggered by the parameter setting electric signal, the output end of the over-temperature protection triggering module outputs the over-temperature protection electric signal;
the slope determination module is provided with an input end and an output end, the input end of the slope determination module is connected with the input end of the electric signal, and the output end of the slope determination module outputs the electric signal which is corresponding to the parameter setting electric signal and represents the slope of the temperature-current/voltage curve.
In the over-temperature protection circuit, the over-temperature protection trigger module includes at least two over-temperature comparators, each of which includes an input end and an output end, the input end of each of the over-temperature comparators is connected to the input end of the electrical signal, each of the over-temperature comparators is provided with a different first reference electrical signal interval, the output end of each of the over-temperature comparators outputs a first level signal based on a comparison result between the parameter setting electrical signal and the first reference electrical signal interval, and the over-temperature protection trigger module determines a voltage or current interval in which the parameter setting electrical signal is located according to all the first level signals;
the slope determination module comprises at least two slope comparators, each slope comparator comprises an input end and an output end, the input end of each slope comparator is respectively connected with the input end of the electric signal, each slope comparator is respectively provided with a different second reference electric signal interval, the output end of each slope comparator respectively outputs each second level signal based on the comparison result of the parameter setting electric signal and the second reference electric signal interval, and the slope determination module acquires the voltage or current interval where the parameter setting electric signal is located according to each second level signal.
In the over-temperature protection circuit, any one of the first reference electrical signal intervals is not equal to any one of the second reference electrical signal intervals;
any of the second electrical reference signal intervals is a subset of the first electrical reference signal intervals, or any of the first electrical reference signal intervals is a subset of the second electrical reference signal intervals.
In the over-temperature protection circuit, an accumulation interval of first reference electrical signal intervals of all the over-temperature comparators is a first continuous interval; the accumulation interval of the second reference electric signal intervals of all the slope comparators is a second continuous interval; the first continuous interval and the second continuous interval have the same numerical range.
In the above-mentioned over-temperature protection circuit,
each over-temperature comparator comprises a section of first reference electric signal interval, and all the first reference electric signal intervals are not overlapped with each other; the number of sections of second reference electric signal intervals in each slope comparator is the same as that of the over-temperature comparators of the over-temperature protection triggering module, and all the second reference electric signal intervals are not overlapped with each other;
and/or
Each slope comparator comprises a section of second reference electric signal interval, and all the second reference electric signal intervals are not overlapped with each other; the number of sections of the first reference electric signal intervals in each over-temperature comparator is the same as that of the slope comparators in the slope determination module, and all the first reference electric signal intervals are not overlapped with each other.
In the over-temperature protection circuit, the lengths of the first reference electrical signal intervals of each section are completely the same, different or partially the same; the accumulated lengths of the second reference electric signal intervals of the slope comparators are completely the same, completely different or partially the same;
and/or
The accumulated lengths of the second reference electric signal intervals of the slope comparators are completely the same, completely different or partially the same; the lengths of the first reference electrical signal intervals are completely the same, completely different or partially the same.
In the over-temperature protection circuit, the electrical signal input end is a voltage signal input end, and the over-temperature comparator and the slope comparator are current comparators;
or
The electric signal input end is a current signal input end, and the over-temperature comparator and the slope comparator are voltage comparators.
In the over-temperature protection circuit, the over-temperature protection triggering module further comprises an over-temperature signal generating circuit; the over-temperature signal generating circuit comprises an input end and an output end, the input end of the over-temperature signal generating circuit is connected with the output ends of all the over-temperature comparators, and when the over-temperature protection function of the over-temperature protection triggering module is triggered by the adjustable signal, the output end of the over-temperature signal generating circuit outputs an over-temperature protection electric signal;
and/or
The slope determining module further comprises a slope selecting circuit, the slope selecting circuit comprises an input end and an output end, the input end of the slope selecting circuit is connected with the output ends of all the slope comparators, and the output end of the slope selecting circuit outputs an electric signal which is corresponding to the parameter setting electric signal and represents the slope of the temperature-current/voltage curve.
In a second aspect, a chip integrated module is provided, which includes a control pin and a logic control unit, the logic control unit includes the over-temperature protection circuit as described above, the control pin is connected to the electrical signal input end of the over-temperature protection circuit, the control pin is used for connecting an external resistor, and the magnitude of the parameter setting electrical signal changes with the resistance value of the external resistor.
The above chip integrated module further includes: the power supply comprises an alternating current input pin, a second grounding pin, a first grounding pin, a rectifying unit and a power supply voltage input pin, wherein the rectifying unit is provided with a rectifying input end, a rectifying output end and a common reference end, the alternating current input pin is connected with the rectifying input end, the first grounding pin is connected with the common reference end, and the second grounding pin is connected with the logic control unit; the power supply voltage input pin is connected with the rectification output end.
The chip integrated module further comprises a switch tube and a current signal sampling pin, the switch tube comprises a source electrode and a control electrode, the source electrode is connected with the current signal sampling pin and the logic control unit, and the logic control unit is connected with the control electrode to control the switch tube to be turned off or turned on.
In the chip integrated module, the chip integrated module further includes a freewheeling diode, an anode of the freewheeling diode is connected to the rectification output terminal, and a cathode of the freewheeling diode is connected to the power supply voltage input pin.
In a third aspect, a control circuit is provided, which includes an external resistor and the chip integrated module as described above, where one end of the external resistor is grounded, and the other end is connected to the control pin.
In a fourth aspect, a lighting device is provided, which includes a light emitting unit, and the control circuit as described above, the control circuit being configured to input a direct current to the light emitting unit.
Compared with the prior art, the invention has the following beneficial effects:
in the embodiment of the invention, the over-temperature protection triggering module is used for outputting an over-temperature protection electrical signal when the over-temperature protection function is triggered, and the slope determining module is used for outputting an electrical signal which represents the slope of a temperature-current/voltage curve and corresponds to the parameter setting electrical signal, so that after the over-temperature protection function is triggered, the over-temperature protection circuit determines the value of reducing the current/voltage according to the electrical signal which represents the slope of the temperature-current/voltage curve, and the over-temperature protection is realized. Compared with the prior art which needs to be provided with two pins and two electrical signal input ends respectively, the over-temperature protection triggering module and the slope determining module in the over-temperature protection circuit are connected with one electrical signal input end together, so that the number of the input ends of the over-temperature protection circuit is reduced. Therefore, after the over-temperature protection circuit group is formed as a part of the chip integrated module, the number of pins of the chip integrated module can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an over-temperature protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a chip integrated module according to a second embodiment of the present invention;
FIG. 3 is a block diagram of a logic control unit of the chip integrated module of FIG. 2;
fig. 4 is a schematic structural diagram of a control circuit according to a third embodiment of the present invention.
Reference numerals:
100-chip integrated module; 10-a logic control unit; 11-a temperature detection subunit; 12-a control subunit; 13-a drive subunit; 14-an over-temperature protection circuit; 141-electrical signal input; 142-an over-temperature protection triggering module; 1421-over-temperature comparator; 1422-over-temperature signal generating circuit; 143-slope determination module; 1431 — a slope comparator; 1432-slope selection circuit;
200-a control circuit; 210-a filter; 220-a chopper; 230-an alternating current module; 240-load.
UI1 — input of over temperature comparator; UI 2-input of slope comparator; UI3 — input of over-temperature signal generating circuit; UI 4-input of slope selection circuit;
UO 1-output terminal of over-temperature comparator; UO 2-output of slope comparator; UO 3-output end of over-temperature signal generating circuit; UO 4-output of slope selection circuit;
Voptd-Voptu: a first reference electrical signal interval; Vslpd-Vslpu: a second reference electrical signal interval;
ACIN-AC input pin; ACIN 1-AC first input pin; ACIN 2-AC second input pin;
GND 1-first ground pin; GND 2-second ground pin;
d1-a rectifying unit; d1 IN-rectifying input; d1IN 1-rectifying the first input; d1IN 2-a rectified second input terminal; d1 OUT-a rectification output end; d1 CG-common reference terminal; d2-freewheeling diode;
EC1 — first capacitance; EC2 — second capacitance; EC3 — third capacitance;
l1 — first inductance; l2 — second inductance;
VIN-supply voltage input pin;
ISEN-current signal sampling pin;
q-switching tube; QS-switch tube source; QD-switching tube drain electrode; QG-switching tube control electrode;
TH/SLP-control pin;
Rth/Rslp-external resistor; RL-parallel resistance; rcs — sampling resistor;
an LED-light emitting unit;
Drain-Drain pin;
an AC-AC source; fuse-fuses.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiment of the present invention, the chip integrated module may be an AC-DC integrated module, or other chip integrated modules that need to add a filter, which is not described herein again. The electromagnetic compatibility may be a requirement for emi (electromagnetic interference) electromagnetic compatibility, or other electromagnetic compatibility requirements.
Implement one
An embodiment of the present invention provides an over-temperature protection circuit 14, as shown in fig. 1, including: an electrical signal input 141, an over-temperature protection triggering module 142 and a slope determining module 143. The electrical signal input terminal 141 Is configured to receive a parameter setting electrical signal, which may be derived from a current source Is. The over-temperature protection trigger module 142 has an input end and an output end, the input end of the over-temperature protection trigger module 142 is connected to the electrical signal input end 141, the over-temperature protection trigger module 142 has an over-temperature protection function, and when the over-temperature protection function is triggered by the parameter setting electrical signal, the output end UO1 of the over-temperature protection trigger module 142 outputs an over-temperature protection electrical signal. The slope determining module 143 has an input end and an output end, the input end of the slope determining module 143 is connected to the electrical signal input end 141, and the output end of the slope determining module 143 outputs an electrical signal of a slope of a temperature-current/voltage curve corresponding to the parameter setting electrical signal.
In the embodiment of the present invention, the over-temperature protection triggering module 142 is configured to output an over-temperature protection electrical signal when the over-temperature protection function is triggered, and the slope determining module 143 is configured to output an electrical signal representing a slope of a temperature-current/voltage curve corresponding to the parameter setting electrical signal, so that after the over-temperature protection circuit triggers the over-temperature protection function, a value for reducing current/voltage is determined according to the electrical signal representing the slope of the temperature-current/voltage curve, so as to implement over-temperature protection. Compared with the prior art which needs to be provided with two pins and two electrical signal input ends 141 respectively, the over-temperature protection triggering module 142 and the slope determining module 143 in the over-temperature protection circuit implemented by the invention are connected with one electrical signal input end 141 together, so that the number of input ends of the over-temperature protection circuit is reduced. Therefore, after the over-temperature protection circuit group is formed as a part of the chip integrated module, the number of pins of the chip integrated module can be reduced.
The signal value (voltage value or current value) of the parameter setting electric signal is adjustable, for example, when the signal value is X, the over-temperature protection function of the over-temperature protection triggering module is not triggered; when the signal value is Y, the over-temperature protection function of the over-temperature protection triggering module is triggered, and the over-temperature protection of the over-temperature protection circuit can be considered as Y. Specifically, referring to fig. 1, in order to realize that the over-temperature protection threshold of the over-temperature protection circuit 14 Is adjustable, for example, the over-temperature protection circuit Is provided for one current source Is, the current source Is may be connected to the electrical signal input terminal 141, and an external resistor Rth/Rslp with an adjustable resistance value Is connected between the electrical signal input terminal 141 and the ground terminal, along with the change of the resistance value of the external resistor Rth/Rslp, the electrical signal input to the electrical signal input terminal 141 (i.e., the electrical signal set by the above parameter) also changes, so as to adjust the over-temperature protection threshold of the current source Is. Therefore, in the embodiment of the present invention, the over-temperature protection circuit 14 sets the over-temperature protection threshold of the current source Is and the slope of the temperature-current/voltage curve according to the magnitude of the received parameter setting electrical signal; in other words, as the magnitude of the parameter setting electrical signal changes, the over-temperature protection threshold of the over-temperature protection circuit to the current source Is, and the slope of the temperature-current/voltage curve also change. In practice, the parameter setting electrical signal may be a tunable electrical signal or a constant electrical signal.
The over-temperature protection triggering module 142 includes at least two over-temperature comparators 1421, each over-temperature comparator 1421 includes an input end UI1 and an output end UO1, the input ends UI1 of the over-temperature comparators 1421 are respectively connected to the electrical signal input ends 141, and each over-temperature comparator 1421 is respectively provided with a different first reference electrical signal interval Voptd-Voptu. At the output UO1 of each over-temperature comparator 1421, each first level signal is output based on the comparison result of the parameter setting electrical signal and the first reference electrical signal interval Voptd-Voptu, respectively. In the over-temperature protection triggering module 142, the voltage or current interval where the parameter setting electric signal is located is determined according to all the first level signals. The number of the over-temperature comparators 1421 in the over-temperature protection module may be three, four, or more.
The slope determining module 143 includes at least two slope comparators 1432, each slope comparator 1432 includes an input UI2 and an output UO2, the input UI2 of each slope comparator 1432 is respectively connected to the electrical signal input 141, each slope comparator 1432 is respectively provided with a different second reference electrical signal interval Vslpd-Vslpu, the output UO2 of each slope comparator 1432 respectively outputs each second level signal based on a comparison result of the parameter setting electrical signal and the second reference electrical signal interval Vslpd-Vslpu, and the slope determining module 143 obtains a voltage or current interval in which the parameter setting electrical signal is located according to each second level signal. In the slope determination module 143, the number of the slope comparators 1432 may be three, four, or more.
Wherein any one of the first reference electrical signal intervals Voptd-Voptu is not equal to any one of the second reference electrical signal intervals Vslpd-Vslpu. Any one of the second electrical reference signal intervals Vslpd-Vslpu is a subset of the first electrical reference signal interval Voptd-Voptu, or any one of the first electrical reference signal intervals Voptd-Voptu is a subset of the second electrical reference signal intervals Vslpd-Vslpu. Therefore, the current/voltage is prevented from being reduced more reasonably according to the current temperature exceeding the over-temperature protection threshold value only by a specific temperature-current/voltage curve slope under the over-temperature protection threshold value; alternatively, it is avoided to have only one over-temperature protection threshold at one temperature-current/voltage curve slope.
In order to enable the parameter setting electric signal to be in any current/voltage range within a set interval (such as the set range of 0-V1 in FIG. 1), whether the over-temperature protection function is triggered or not can be judged, and the corresponding electric signal representing the slope of the temperature-current/voltage curve can be acquired. The accumulation interval of the first reference signal intervals of all over-temperature comparators 1421 is a first continuous interval; for example, if the first reference electrical signal intervals Voptd-Voptu of the two over-temperature comparators 1421 are (4, 8] volts and (8, 12] volts, respectively, the accumulation interval of the first reference electrical signal intervals Voptd-Voptu of the two over-temperature comparators 1421 is (4, 12] volts and is a continuous interval, and the accumulation interval of the second reference electrical signal intervals Vslpd-Vslpu of all slope comparators 1432 is a second continuous interval, for example, if the second reference electrical signal intervals Vslpd-Vslpu of the two slope comparators 1432 are (4, 6] volts and (6, 12] volts, respectively, the accumulation interval of the second reference electrical signal intervals Vslpd-Vslpu of the two slope comparators 1432 is (4, 12] volts and is a continuous interval, and the numerical ranges of the first continuous interval and the second continuous interval are the same.
In an embodiment of the present invention, each over-temperature comparator 1421 may include a first reference electrical signal interval vopt-vopt, and all the first reference electrical signal intervals vopt-vopt are not overlapped with each other. For example, if the over-temperature protection trigger module 142 includes two over-temperature comparators 1421, the two first reference electrical signal intervals Voptd-Voptu are (4, 8] volts and (8, 12] volts, respectively, and accordingly, the number of the second reference electrical signal intervals Vslpd-Vslpu in each slope comparator 1432 is the same as the number of the over-temperature comparators 1421 of the over-temperature protector trigger module, and all the second reference electrical signal intervals Vslpd-Vslpu do not overlap with each other, for example, the over-temperature protection trigger module 142 includes two over-temperature comparators 1421, each slope comparator 1432 in the slope determination module 143 has two second reference electrical signals, and if there are two slope comparators 1432 in the slope determination module 143, the two second reference electrical signal intervals Vslpd-Vslpu in the first slope comparator 1432 are (4, 6], (8, 10] volts, and the two second reference electrical signal intervals Vslpu-Vslpu in the second slope comparator 1432 are (4, 6, 8], (10, 12] volts.
When each over-temperature comparator 1421 includes a segment of the first electrical reference signal interval Vslpd-Vslpu, the lengths of the segments of the first electrical reference signal interval Voptd-Voptu may be completely the same, completely different, or partially the same. As described above, the over-temperature protection triggering module 142 includes two over-temperature comparators 1421, where the lengths of the two first reference electrical signal intervals Voptd-Voptu are the same if the two first reference electrical signal intervals Voptd-Voptu are (4, 8] volts and (8, 12) volts, the lengths of the two first reference electrical signal intervals Voptd-Voptu are different if the two first reference electrical signal intervals Voptd-Voptu are (4, 7] volts and (7, 12) volts, and the lengths of the three first reference electrical signal intervals Voptd-Voptu are the same if the number of the comparators is three and the three first reference electrical signal intervals Voptd-Voptu are (4, 8] volts, (8, 12] volts and (12, 13) volts.
All the second reference electrical signal sections Vslpd to Vslpu do not overlap with each other, and include: all the second reference electrical signal intervals Vslpd-Vslpu of the same slope comparator 1432 do not overlap with each other, and all the second reference electrical signal intervals Vslpd-Vslpu of all the slope comparators 1432 do not overlap with each other.
Correspondingly, the cumulative lengths of the second reference electrical signal intervals Vslpd-Vslpu in each slope comparator 1432 may be completely the same, completely different, or partially the same. For example, each slope comparator 1432 in the slope determining module 143 has two second reference electrical signal intervals Vslpd-Vslpu, if there are two slope comparators 1432 in the slope determining module 143, the two second reference electrical signal intervals Vslpd-Vslpu in the first slope comparator 1432 are respectively (4, 6), (8, 10] volts, and the cumulative length is 4, the two second reference electrical signal intervals Vslpd-Vslpu in the second slope comparator 1432 are respectively (6, 8), (10, 12] volts, and the cumulative length is also 4, the cumulative length of the second reference electrical signal interval Vslpd-Vslpu in the first slope comparator 1432 is equal to the cumulative length of the second reference electrical signal intervals Vslpd-Vslpu in the second slope comparator 1432, for example, the two second reference electrical signal intervals Vslpd-Vslpu in the first slope comparator 1432 are respectively 4, 5], (8, 10] volt, the second reference electrical signal intervals Vslpd-Vslpu at both ends of the second slope comparator 1432 are (5, 8], (10, 12] volt, respectively, the cumulative lengths of the two are different, if the slope determining module 143 has three second slope comparators 1432, the cumulative length of the first slope comparator 1432 is 4, the cumulative length of the second slope comparator 1432 is 4, and the cumulative length of the third slope comparator 1432 can be 5, so the cumulative lengths of the three are partially the same.
As a variation, each slope comparator 1432 may include a second reference electrical signal interval Vslpd-Vslpu, and all the second reference electrical signal intervals Vslpd-Vslpu do not overlap with each other. Also, the number of the first reference electrical signal intervals Voptd-Voptu of each over-temperature comparator 1421 is the same as the number of the slope comparators 1432 in the slope determination module 143, and all the first reference electrical signal intervals Voptd-Voptu do not overlap with each other. Correspondingly, the cumulative lengths of the second reference electrical signal intervals Vslpd-Vslpu of the slope comparators 1432 may be completely the same, completely different, or partially the same; the lengths of the segments of the first electrical reference signal interval vopt-vopt may also be identical, completely different or partially identical.
Wherein, the first reference electrical signal interval Voptd-Voptu may be input by an input terminal of the over-temperature comparator 1421; the second reference electrical signal interval Vslpd-Vslpu may be input by an input terminal of the slope comparator 1432.
The number of slope comparators 1432 may be equal to, greater than, or less than the number of over-temperature comparators 1421.
For example, in the embodiment of the present invention, the number of slope comparators 1432 is equal to the number of over-temperature comparators 1421, and all over-temperature comparators 1421 include a first reference electrical signal interval Voptd-Voptu, and all the first reference electrical signal intervals Voptd-Voptu have the same length. The number of the second reference electrical signals in each slope comparator 1432 is equal to the number of over-temperature comparators 1421, and the cumulative lengths of the second reference electrical signal intervals Vslpd-Vslpu in each slope comparator 1432 are the same.
In the embodiment of the present invention, the electrical signal input terminal 141 is a voltage signal input terminal, the electrical signal input terminal 141 receives a voltage signal to be measured, the over-temperature comparator 1421 and the slope comparator 1432 are current comparators, and correspondingly, the slope determination module 143 determines the slope of the temperature-voltage curve. As a variation, the electrical signal input terminal 141 is a current signal input terminal, the electrical signal input terminal 141 receives a current signal to be measured, the over-temperature comparator 1421 and the slope comparator 1432 are voltage comparators, and correspondingly, the slope determination module 143 determines the slope of the temperature-current curve.
In the embodiment of the present invention, the over-temperature protection triggering module 142 further includes an over-temperature signal generating circuit 1422, the over-temperature signal generating circuit 1422 includes an input end UI3 and an output end UO3, and an input end of the over-temperature signal generating circuit 1422 is connected to the output ends UO1 of all over-temperature comparators 1421. The over-temperature signal generating circuit 1422 sets a voltage/current interval in which the electrical signal is located according to the parameter, and determines whether to output the over-temperature protection electrical signal. Therefore, the output terminal UO3 of the over-temperature signal generating circuit 1422 outputs an over-temperature protection electrical signal when the over-temperature protection function is triggered. And the current voltage/current reference value is a voltage/current value corresponding to the current temperature and is determined based on the preset corresponding relation between the temperature and the voltage/current.
The slope determination module 143 further comprises a slope selection circuit 1432, the slope selection circuit 1432 comprising an input UI4 and an output UO4, the input UI4 of the slope selection circuit 1432 being connected to the outputs UO2 of all slope comparators 1432. The slope selection circuit 1432 determines the slope of the temperature-current-voltage curve according to the voltage/current interval in which the parameter setting electrical signal is located. Thus, the output UO4 of the slope selection circuit 1432 outputs an electrical signal corresponding to the parameter setting electrical signal that is representative of the slope of the temperature-current/voltage curve.
It should be noted that in the implementation of the present invention, the input terminals of the over-temperature protection triggering module 142 are the input terminal UI1 of the over-temperature comparator 1421 and the input terminal UI2 of the slope comparator 1432; the output terminal of the over-temperature protection triggering module 142 is the output terminal UO3 of the over-temperature signal generating circuit 1422 and the output terminal UO4 of the slope selecting circuit 1432.
In the over-temperature protection circuit 14 provided in the embodiment of the present invention, the over-temperature protection triggering module 142 and the slope driving module 143 are commonly connected to one electrical signal input terminal 141, so that the number of input terminals of the over-temperature protection circuit 14 is reduced. Therefore, when the over-temperature protection circuit 14 is provided as a part of the chip integrated module 10, the number of pins of the chip integrated module 10 can be reduced.
Specifically, referring to fig. 1, under the condition that the current source Is not changed, if the external resistor Rth/Rslp Is changed, the voltage of the parameter setting electrical signal Is changed, and the over-temperature protection threshold corresponding to the parameter setting electrical signal Is also changed in the over-temperature signal generating circuit 1422. Therefore, in the over-temperature protection circuit 14 to which the present invention Is applied, for the current source Is, the over-temperature protection threshold for triggering the over-temperature protection function may be determined according to the resistance value of the external resistor Rth/Rslp provided between the electrical signal input terminal 141 and the ground terminal. Similarly, in fig. 1, under the condition that the current source Is not changed, if the external resistor Rth/Rslp Is changed, the voltage of the parameter setting electrical signal Is also changed, and the electrical signal of the temperature-current-voltage curve slope corresponding to the parameter setting electrical signal Is also changed in the slope selection circuit 1432.
Example two
As shown in fig. 2, an embodiment of the present invention provides a chip integrated module 100, including: the power supply comprises an alternating current input pin ACIN, a second ground pin GND2, a first ground pin GND1, a rectifying unit D1, a supply voltage input pin VIN and a logic control unit 10. The rectifying unit D1 has a rectifying input terminal D1IN, a rectifying output terminal D1OUT, and a common reference terminal D1 CG. The ac input pin ACIN is connected to the rectifying input terminal D1IN, the first ground pin GDN2 is connected to the common reference terminal D1CG, the second ground pin GND2 is connected to the logic control unit 10, and the supply voltage input pin VIN is connected to the rectifying output terminal D1 OUT. The rectified input D1 includes a rectified first input D1IN1 and a rectified second input D1IN 2.
The chip integrated module 100 includes the second ground pin GND2 and the first ground pin GND1, and the filter 210 is connected to the chip integrated module 100 because the chip integrated module 100 has two ground pins. The filter comprises a first inductance L2 and a first capacitance EC 1. The first inductor L2 of the filter 210 may be connected between two ground pins, and the first capacitor EC1 of the filter 210 is further disposed between the supply voltage input pin VIN and the first ground pin GND1, that is, the first capacitor EC1 of the filter 210 is disposed at the rear end of the rectifying unit D1, that is, the input ac power is rectified and then filtered, so that the filter 210 does not need to use an ampere-standard capacitor but uses an electrolytic capacitor or a thin-film capacitor to achieve a filtering effect, and the cost and the volume of the chip integrated module 100 connected to the filter 210 are not greatly increased.
The ac input pin ACIN has two pins, which are the ac first input pin ACIN1 and the ac second input pin ACIN2 in fig. 2, respectively, for receiving 220V ac power or other volts ac power. The rectifying unit D1 may be a rectifying bridge or other rectifying elements, and the rectifying bridge is a full bridge or a half bridge. The second ground pin GND2 and the first ground pin GND1 are two pins, GND2 and GND 1in fig. 2, respectively. And the logic control unit 10 is configured to determine an output driving command according to the input signal to drive the corresponding load 240.
The chip integrated module 100 further includes a switching tube Q and a current signal sampling pin ISEN, where the switching tube Q includes a source QS, a drain QD and a control electrode QG, and the source QD is connected to the current signal sampling pin ISEN and the logic control unit 10. The logic control unit 10 is connected to the control electrode QG of the switching tube Q, and outputs a driving signal to the control electrode QG of the switching tube Q based on the current target of current drop or current rise in combination with the sampled current signal, so as to control the switching-off or switching-on of the switching tube Q, thereby achieving the purpose of adjusting voltage or current.
The chip integrated module 100 further includes a freewheeling diode D2, the anode of the freewheeling diode D2 is connected to the rectification output terminal DIOUT, and the cathode of the freewheeling diode D2 is connected to the supply voltage input pin VIN, so as to prevent the voltage abrupt change from damaging the components in the chip integrated module 100.
Specifically, as shown in fig. 3, the logic control unit 10 may include a temperature detection subunit 11, a control subunit 12, a driving subunit 13, and an over-temperature protection circuit 14 as mentioned in the first embodiment. The temperature detecting subunit 11 is configured to detect a current temperature of the chip integrated module 100, and send a logic signal to the control subunit 12 according to the detected current temperature. The control subunit 12 includes a first input end, a second input end and a logic output end, the first input end is connected to the temperature detection subunit 11, and the second input end is connected to the current signal sampling pin, that is, the control subunit 12 receives the logic signal sent by the temperature detection subunit 11 through the first input end. The logic output is connected to the drive subunit 13 to output a drive signal to the drive subunit 13. The driving subunit 13 is connected between the logic output end and the control electrode of the switching tube, and is configured to output a driving instruction to the control electrode of the switching tube according to the received driving signal, and the switching tube is turned on or off according to the driving instruction. Obviously, the output terminal of the driving subunit 13 is the output terminal of the logic control unit 10.
The chip integrated module 100 further includes a control pin TH/SLP, and the logic control unit 10 further includes an over-temperature protection circuit 14 as implemented in the first embodiment. The control pin TH/SLP is connected to the input end UI1 of the over-temperature protection triggering module in the logic control unit 10 and the input end UI3 of the slope determination module, and the control pin TH/SLP is used for connecting the external resistor Rth/Rslp. The logic control unit 10 is connected to the control pin TH/SLP, and determines an over-temperature protection threshold and a temperature-current curve slope of the chip integration module 100 according to a resistance value of the external resistor Rth/Rslp based on a preset mapping relationship.
Wherein, the preset mapping relationship comprises: and determining the over-temperature protection threshold of the chip integrated module 100 according to the resistance value interval where the resistance value of the external resistor Rth/Rslp is located based on the mapping relation between the resistance value interval and the over-temperature protection value. The preset mapping relationship further includes: and determining the over-temperature protection threshold of the chip integrated module 100 according to the resistance value of the external resistor Rth/Rslp based on the mapping relation between the resistance value and the slope of the temperature-current curve.
The establishment of the preset mapping relationship may refer to the first embodiment, and then the parameter setting electric signal input to the over-temperature protection circuit 14 is adjusted according to the external resistor Rth/Rslp, so that the over-temperature protection threshold and the temperature-current curve slope are determined based on the resistance value of the external resistor Rth/Rslp. For example, when the resistance value of the external resistor Rth/Rslp is between 100 and 200 ohms, the over-temperature protection threshold value is A, and when the resistance value of the external resistor Rth/Rslp is between 200 and 300 ohms, the over-temperature protection threshold value is B. If the current resistance value of the external resistor Rth/Rslp is 150 ohms, the over-temperature protection threshold value is A, and the slope of the temperature-current curve is K1; if the current resistance value of the external resistor Rth/Rslp is adjusted to 180 ohms, the over-temperature protection threshold is still A, but the slope of the temperature-current curve is K2. Obviously, the external resistor Rth/Rslp is a resistor with an adjustable resistance value, and can be adjusted according to the actual requirements of the chip integrated module 100.
For example, the temperature detecting subunit 11 detects the current temperature of the chip integrated module 100, and sends a corresponding logic signal to the control subunit 12 according to the current temperature. The control subunit 12 obtains the corresponding over-temperature protection threshold according to the resistance value of the external resistor Rth and the mapping relationship established by the over-temperature protection circuit 14, and judges whether the current temperature exceeds the over-temperature protection threshold based on the logic signal, if so, the temperature needs to be reduced. The control subunit 12 obtains the slope of the temperature-current curve of the chip integrated module 100 according to the resistance value of the external resistor Rslp and the mapping relationship established by the over-temperature protection circuit 14, determines how many current values need to be adjusted according to the temperature value to be reduced or the target temperature value and the current obtained by sampling, calculates a corresponding driving signal, and sends the driving signal to the driving subunit 13. The driving subunit 13 generates a driving instruction for turning on or off the switching tube Q according to the driving signal, thereby completing current regulation.
Referring to fig. 2, the chip integrated module 100 according to the embodiment of the invention further includes a Drain pin Drain of the switching tube Q.
It should be noted that fig. 2 only shows one arrangement of the pins in the chip integrated module 100 according to the present invention, and the position relationship of the pins can be adjusted adaptively according to actual situations.
EXAMPLE III
As shown in fig. 4, an embodiment of the invention provides a control circuit 200, which includes a filter 210 and the chip integrated module 100 of the second embodiment. Filter 210 may be an EMI filter, or other type of filter, among others.
The filter 210 includes a first inductor L2 and a first capacitor EC1, the first inductor L2 is used for realizing filtering, two ends of the first inductor are respectively connected to a second ground pin GND2 and a first ground pin GND1 of the chip integrated module 100, the second ground pin GND2 and the first ground pin GND1 are respectively grounded, a positive electrode of the first capacitor EC1 is connected to the supply voltage input pin VIN, and a negative electrode of the first capacitor ECI is connected to the second ground pin GND 2.
In the embodiment of the present invention, the first capacitor EC1 of the filter 210 is disposed between the supply voltage input pin VIN and the first ground pin GND1, that is, the first capacitor EC1 of the filter 210 is disposed at the rear end of the rectifying unit D1, that is, the input ac power is rectified and then filtered, so that the filter 210 can achieve the filtering effect without using a safety capacitor but using an electrolytic capacitor or a film capacitor, and compared with the prior art, the chip integrated module 100 achieves the filtering function without greatly increasing the cost and the volume after being connected to the filter 210.
The control circuit 200 further comprises a sampling resistor Rcs connected between the current signal sampling pin ISEN and the second ground pin GND2 to sample the current in the circuit.
The chip integrated module 100 further includes a control pin TH/SLP, and the logic control unit 10 is connected to the control pin TH/SLP. The control circuit 200 comprises an external resistor Rth/Rslp, the external resistor Rth/Rslp is connected between the control pin TH/SLP and the second grounding pin GND2, and the logic control unit 10 determines the over-temperature protection threshold value of the chip integrated module 100 and the temperature-current curve slope of the chip integrated module 100 according to the resistance value of the external resistor Rth/Rslp.
The control circuit 200 further includes a chopper 220, and the chopper 220 is connected between the chip integrated module 100 and the load 240 so that the voltage output to the load 240 is variable.
The chip integrated module 100 includes a switching tube Q including a drain QD; the chopper 220 includes a second inductor L1 and a second capacitor EC2, the second inductor L1 being connected between the drain QD and the load 240; the positive electrode of the second capacitor EC2 is connected to the supply voltage input pin VIN, and the negative electrode of the second capacitor EC2 is connected to the second ground pin GND 2.
In addition, the control circuit 200 further includes an AC module 230, where the AC module 230 includes an AC source AC and a Fuse, the AC source AC is connected to the AC input pin ACIN; the Fuse is connected between the AC source AC and the AC input pin ACIN, and is disconnected when the current exceeds a predetermined value, thereby protecting the chip integrated module 100.
In the embodiment of the present invention, the load 240 may include a light emitting unit LED, or may be other components that need to be powered by a direct current. Specifically, referring to fig. 4, the load 240 includes a third capacitor EC3 and a parallel resistor RL disposed in parallel with the LED lighting unit.
Example four
The embodiment of the invention provides a lighting device, which comprises a light-emitting unit LED and a control circuit 200 in the third embodiment, wherein the control circuit 200 is used for inputting direct current to the light-emitting unit LED, and the light-emitting unit LED is used for emitting lighting rays.
It should be apparent to those skilled in the art that while the preferred embodiments of the present invention have been described, additional variations and modifications in these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. An over-temperature protection circuit, comprising: the over-temperature protection device comprises an electric signal input end, an over-temperature protection triggering module and a slope determining module;
the electric signal input end is used for receiving a parameter setting electric signal;
the over-temperature protection triggering module is provided with an input end and an output end, the input end of the over-temperature protection triggering module is connected with the electric signal input end, and when the over-temperature protection function of the over-temperature protection triggering module is triggered by the parameter setting electric signal, the output end of the over-temperature protection triggering module outputs the over-temperature protection electric signal;
the slope determination module is provided with an input end and an output end, the input end of the slope determination module is connected with the input end of the electric signal, and the output end of the slope determination module outputs the electric signal which is corresponding to the parameter setting electric signal and represents the slope of the temperature-current/voltage curve.
2. The over-temperature protection circuit according to claim 1, wherein the over-temperature protection trigger module includes at least two over-temperature comparators, each of the over-temperature comparators includes an input end and an output end, the input end of each of the over-temperature comparators is connected to the electrical signal input end, each of the over-temperature comparators is provided with a different first reference electrical signal interval, the output end of each of the over-temperature comparators outputs a first level signal based on a comparison result between the parameter setting electrical signal and the first reference electrical signal interval, and the over-temperature protection trigger module determines a voltage or current interval in which the parameter setting electrical signal is located according to all the first level signals;
the slope determination module comprises at least two slope comparators, each slope comparator comprises an input end and an output end, the input end of each slope comparator is respectively connected with the input end of the electric signal, each slope comparator is respectively provided with a different second reference electric signal interval, the output end of each slope comparator respectively outputs each second level signal based on the comparison result of the parameter setting electric signal and the second reference electric signal interval, and the slope determination module acquires the voltage or current interval where the parameter setting electric signal is located according to each second level signal.
3. The over-temperature protection circuit of claim 2, wherein any of the first electrical reference signal intervals is not equal to any of the second electrical reference signal intervals;
any of the second electrical reference signal intervals is a subset of the first electrical reference signal intervals, or any of the first electrical reference signal intervals is a subset of the second electrical reference signal intervals.
4. The over-temperature protection circuit according to claim 2, wherein an accumulation interval of the first reference electrical signal intervals of all the over-temperature comparators is a first continuous interval; the accumulation interval of the second reference electric signal intervals of all the slope comparators is a second continuous interval; the first continuous interval and the second continuous interval have the same numerical range.
5. The over-temperature protection circuit of claim 4,
each over-temperature comparator comprises a section of first reference electric signal interval, and all the first reference electric signal intervals are not overlapped with each other; the number of sections of second reference electric signal intervals in each slope comparator is the same as that of the over-temperature comparators of the over-temperature protection triggering module, and all the second reference electric signal intervals are not overlapped with each other;
and/or
Each slope comparator comprises a section of second reference electric signal interval, and all the second reference electric signal intervals are not overlapped with each other; the number of sections of the first reference electric signal intervals in each over-temperature comparator is the same as that of the slope comparators in the slope determination module, and all the first reference electric signal intervals are not overlapped with each other.
6. The over-temperature protection circuit according to claim 2, wherein the lengths of the first reference electrical signal intervals of the respective segments are completely the same, completely different, or partially the same; the accumulated lengths of the second reference electric signal intervals of the slope comparators are completely the same, completely different or partially the same;
and/or
The accumulated lengths of the second reference electric signal intervals of the slope comparators are completely the same, completely different or partially the same; the lengths of the first reference electrical signal intervals are completely the same, completely different or partially the same.
7. The over-temperature protection circuit according to claim 2, wherein the electrical signal input terminal is a voltage signal input terminal, and the over-temperature comparator and the slope comparator are current comparators;
or
The electric signal input end is a current signal input end, and the over-temperature comparator and the slope comparator are voltage comparators.
8. The over-temperature protection circuit of claim 2, wherein the over-temperature protection triggering module further comprises an over-temperature signal generating circuit; the over-temperature signal generating circuit comprises an input end and an output end, the input end of the over-temperature signal generating circuit is connected with the output ends of all the over-temperature comparators, and when the over-temperature protection function of the over-temperature protection triggering module is triggered by the adjustable signal, the output end of the over-temperature signal generating circuit outputs an over-temperature protection electric signal;
and/or
The slope determining module further comprises a slope selecting circuit, the slope selecting circuit comprises an input end and an output end, the input end of the slope selecting circuit is connected with the output ends of all the slope comparators, and the output end of the slope selecting circuit outputs an electric signal which is corresponding to the parameter setting electric signal and represents the slope of the temperature-current/voltage curve.
9. A chip integrated module is characterized by comprising a control pin and a logic control unit, wherein the logic control unit comprises the over-temperature protection circuit as claimed in any one of claims 1 to 8, the control pin is connected with the electric signal input end of the over-temperature protection circuit, the control pin is used for connecting an external resistor, and the magnitude of the parameter setting electric signal changes along with the resistance value change of the external resistor.
10. The chip integrated module according to claim 9, further comprising: the power supply comprises an alternating current input pin, a second grounding pin, a first grounding pin, a rectifying unit and a power supply voltage input pin, wherein the rectifying unit is provided with a rectifying input end, a rectifying output end and a common reference end, the alternating current input pin is connected with the rectifying input end, the first grounding pin is connected with the common reference end, and the second grounding pin is connected with the logic control unit; the power supply voltage input pin is connected with the rectification output end.
11. The chipset integrated module according to claim 10, further comprising a switch tube and a current signal sampling pin, wherein the switch tube comprises a source and a control electrode, the source is connected to the current signal sampling pin and the logic control unit, and the logic control unit is connected to the control electrode to control the switch tube to be turned off or turned on.
12. The chip integrated module according to claim 10, further comprising a freewheeling diode, wherein an anode of the freewheeling diode is connected to the rectifying output terminal, and a cathode of the freewheeling diode is connected to the supply voltage input pin.
13. A control circuit, comprising an external resistor and the chip integrated module as claimed in any one of claims 9-12, wherein one end of the external resistor is connected to ground, and the other end is connected to the control pin.
14. A lighting device comprising a light emitting unit, and the control circuit according to claim 13, wherein the control circuit is configured to input a direct current to the light emitting unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203883456U (en) * | 2014-04-03 | 2014-10-15 | 上海新进半导体制造有限公司 | Multiplexing detection circuit, switching power supply controller and fly-back converter |
| CN108899959A (en) * | 2018-08-07 | 2018-11-27 | Oppo广东移动通信有限公司 | Electronic device charging protection circuit, method, device, electronic device and medium |
| CN212588085U (en) * | 2020-06-22 | 2021-02-23 | 欧普照明股份有限公司 | Over-temperature protection circuit, chip integrated module, control circuit and lighting device |
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2020
- 2020-06-22 CN CN202010573189.9A patent/CN111628479B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203883456U (en) * | 2014-04-03 | 2014-10-15 | 上海新进半导体制造有限公司 | Multiplexing detection circuit, switching power supply controller and fly-back converter |
| CN108899959A (en) * | 2018-08-07 | 2018-11-27 | Oppo广东移动通信有限公司 | Electronic device charging protection circuit, method, device, electronic device and medium |
| CN212588085U (en) * | 2020-06-22 | 2021-02-23 | 欧普照明股份有限公司 | Over-temperature protection circuit, chip integrated module, control circuit and lighting device |
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