CN111244896A - Motor demagnetization protection circuit, motor and compressor - Google Patents
Motor demagnetization protection circuit, motor and compressor Download PDFInfo
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- CN111244896A CN111244896A CN201811437356.6A CN201811437356A CN111244896A CN 111244896 A CN111244896 A CN 111244896A CN 201811437356 A CN201811437356 A CN 201811437356A CN 111244896 A CN111244896 A CN 111244896A
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- 230000005347 demagnetization Effects 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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Abstract
The invention provides a motor demagnetization protection circuit, a motor and a compressor, wherein the motor demagnetization protection circuit comprises: the control module is used for outputting a plurality of paths of pulse modulation driving signals; the inverter module comprises a plurality of paths of bridge arms, wherein the plurality of paths of bridge arms correspondingly receive the plurality of paths of pulse modulation driving signals and are used for inverting the plurality of paths of pulse modulation driving signals into control signals for controlling the motor to run; the overcurrent protection module comprises a plurality of electronic switches and a detection submodule, the electronic switches are respectively arranged corresponding to the multipath bridge arms one by one, the detection submodule is electrically connected with the inverter module so as to collect sampling signals of the inverter module, and the electronic switches can control the multipath bridge arms to be connected or disconnected according to detection results of the detection submodule. According to the technical scheme of the invention, through preventing overcurrent, demagnetization protection of the magnet in the motor rotor is realized, the structure is simple, the preparation cost is low, and the reliability is high.
Description
Technical Field
The invention relates to the field of motors, in particular to a motor demagnetization protection circuit, a motor and a compressor.
Background
Small-power (300W-500W) refrigeration equipment such as a base station air conditioner and a vehicle-mounted refrigerator is gradually widely applied, but the small-power refrigeration equipment has the problems of control step loss, abnormal load state, unstable or fluctuating power supply, irregular field installation and the like, and the problems can cause the current to increase suddenly, so that the current reaches or exceeds the specified protection threshold of the compressor, and further the compressor and a controller are damaged.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a demagnetization protection circuit for a motor.
Another object of the present invention is to provide a compressor.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a demagnetization protection circuit for a motor, including: the control module is used for outputting a pulse modulation driving signal; the inverter module correspondingly receives the pulse modulation driving signal and is used for inverting the pulse modulation driving signal into a control signal for controlling the motor to run; the overcurrent protection module comprises an electronic switch and a detection submodule, the electronic switch is correspondingly arranged with the inverter module, the detection submodule is electrically connected with the inverter module to collect sampling signals of the inverter module, and the electronic switch can control the inverter module to be switched on or switched off according to detection results of the detection submodule.
In the above technical solution, preferably, the control module outputs a plurality of paths of pulse modulation driving signals; the inverter module comprises a plurality of paths of bridge arms, and the plurality of paths of bridge arms correspondingly receive a plurality of paths of pulse modulation driving signals; the electronic switches and the multi-path bridge arms are arranged one by one correspondingly so as to control the multi-path bridge arms to be switched on or off according to the detection result.
In the technical scheme, because the output voltage of an inverter module is directly used as a driving signal of a motor, whether the electromagnetism of the motor has the risk of demagnetization is determined by detecting whether the output voltage of the inverter module is normal or not, an overcurrent protection module is added between a control module and the inverter module and comprises a plurality of electronic switches and detection submodules, each electronic switch corresponds to a transmission channel between the control module and the inverter module so as to control whether to output a multi-path pulse modulation driving signal to the inverter module or not through the on-off control of the electronic switches, wherein the on-off of the electronic switches can be controlled by the output signal of the detection submodules, when the output voltage of the inverter module is detected to be abnormal, the electronic switches are controlled to be conducted, so that the pulse modulation driving signal is forcibly pulled down to realize the rapid turn-off of a multi-path bridge arm, through preventing the appearance of overflowing, realized the demagnetization protection of the magnet in the electric motor rotor, simple structure, preparation cost is low to the reliability is high.
Wherein, control module 10 includes singlechip (MCU), and MCU can embed the drive IC who is used for PWM (pulse width modulation), also can use with drive IC combination, compares with prior art, and drive IC inside no longer need built-in protection circuit.
The demagnetization protection circuit of the motor in the embodiment provided by the invention can also have the following additional technical characteristics:
in the above technical solution, preferably, the inverter module further includes a sampling resistor, configured to collect a motor control voltage of the inverter module as a sampling signal; the detection submodule comprises a comparator, a first input end of the comparator inputs motor control voltage, a second input end of the comparator inputs demagnetization protection threshold voltage, the electronic switches are a plurality of diodes which are arranged in parallel, anodes of the diodes are correspondingly connected to a connection point of each passage between the control module and the inverter module, and cathodes of the diodes are connected to an output end of the comparator.
In the technical scheme, as a simplest and most reliable setting mode of the electronic switch, the electronic switch can be diodes with single-phase conduction characteristics, the number of the diodes is the same as that of transmission paths, wherein the diodes can be single integrated diodes or two in-phase conventional diodes, when a circuit works normally, the diodes are cut off to play a role in signal isolation, and when an overcurrent phenomenon occurs, the cathode of the diodes is pulled down to a low level, so that the function of forcibly pulling down 6 paths of control signals under an abnormal condition is realized.
In any of the above technical solutions, preferably, the output end of the comparator is further connected to a control port of the control module, wherein when it is detected that the motor control voltage is greater than the demagnetization protection threshold voltage, the comparator outputs a voltage abnormal signal to the control module, and the control module controls to stop outputting the multi-path pulse modulation driving signal according to the voltage abnormal signal.
In the technical scheme, by arranging a plurality of diodes, according to the turning state of a comparator, the multi-channel PWM signals are forcibly pulled down through hardware when circuit abnormity occurs, so that the compressor is protected, further, the output end of the comparator is connected to a control port of a control module, so that when the circuit abnormity is detected (namely the motor control voltage is greater than the demagnetization protection threshold voltage), the output of the PWM signals is stopped through a software control mode, the hardware is quickly turned off firstly, then the driving signals are switched through software, so that the compressor is quickly and effectively protected, and the reliability of demagnetization protection is higher through a protection mode combining hardware control and software control.
Specifically, the comparator part mainly achieves the purpose of signal inversion, and may be formed by a single comparator or an odd number (> ═ 1) of op-amp configurations, so as to achieve signal inversion through the setting of the comparator, and the demagnetization protection threshold voltage may be obtained through conventional resistance voltage division, or may be obtained through an equal proportion op-amp.
The demagnetization protection threshold voltage Vref can be obtained through conventional resistance voltage division or through equal proportion operational amplifier output. The diode D1 plays a role in forward overvoltage protection, the diode D8 plays a role in negative voltage protection, and a protected object is an I/O port of the MCU.
In any one of the above technical solutions, preferably, the detection sub-module further includes: the output end of the comparator is connected to the control port through the first resistor; the other ends of the plurality of diodes are connected to a connection point between the first resistor and the control port.
In this technical scheme, through setting up first resistance to the realization exports to control module's washing to the comparator and carries out RC filtering, and then is favorable to promoting the detection precision.
In any one of the above technical solutions, preferably, the detection sub-module further includes: and one end of the second resistor is connected to the power supply, and the other end of the second resistor is connected to one end, far away from the comparator, of the first resistor.
In this embodiment, the second resistor is provided, so that the comparator is an open-circuit output, and therefore a pull-up resistor needs to be connected, and the second resistor is determined as a pull-up resistor.
In any one of the above technical solutions, preferably, the detection sub-module further includes: and the anode of the first diode is connected between the first resistor and the control port, and the cathode of the first diode is connected to the power supply, wherein when the output voltage of the output end of the comparator is greater than the voltage of the power supply, the control port is clamped by overvoltage through the first diode.
In any one of the above technical solutions, preferably, the detection sub-module further includes: the control circuit comprises a first resistor, a second resistor, a first capacitor, a second diode and a control module, wherein the second diode and the first capacitor are connected in parallel, one end of the second diode and one end of the first capacitor are grounded, the other end of the second diode and the other end of the first capacitor are connected between the first resistor and the control module, and when the output voltage of the output end of the comparator is larger than the voltage of the power supply, the control port is clamped by negative voltage through the second diode.
In the technical scheme, a first diode and a second diode are respectively arranged, the first diode is used for forward overvoltage protection, the second diode is used for negative voltage protection, and a protection object is an I/O (input/output) port of the MCU.
In any one of the above technical solutions, preferably, the multi-path bridge arm includes: the grid electrode of the NMOS device is correspondingly connected to the driving port of the control module so as to correspondingly receive the pulse modulation driving signal, the drain electrode of the NMOS device is respectively connected to the output end of the inverter module, the source electrode of the NMOS device is respectively connected to one end of the sampling resistor, and the other end of the sampling resistor is grounded.
In the technical scheme, the inverter module consists of 6 upper and lower bridge arms of NMOS, a sampling resistor is arranged between a grounding end and a source electrode of the NMOS, total current on a bus is collected, and the compressor is controlled in an SPWM (sinusoidal pulse width modulation) mode.
When the circuit normally works, six diodes are in a cut-off state, the protection circuit does not work, when the current value passing through the sampling resistor is larger than the demagnetization protection current threshold value of the compressor, the output of the comparator is grounded, six driving ports UH, VH, WH, UL, VL and WL of the control module 10 are forcibly pulled to the ground through the diodes D2, D3, D4, D5, D6 and D7, meanwhile, the low level of the control ports is detected through the MCU, and after internal processing of the MCU, a signal instruction for closing UH, VH, WH, UL, VL and WL is made, so that hardware is quickly turned off, then driving signals are switched through software, and quick and effective protection of the compressor is realized. Compared with the traditional IPM scheme and the DRIVER scheme of an internal integrated protection circuit, the method has the advantages of low cost and reliability.
In any one of the above technical solutions, preferably, the inverter module further includes: and one end of the second capacitor is connected to the output end of the inverter module, and the other end of the second capacitor is grounded.
An embodiment of the second aspect of the present invention provides a motor, including the demagnetization protection circuit of the motor provided by the embodiment of the first aspect of the present invention.
Embodiments of the third aspect of the present invention provide a compressor comprising a motor as set forth in embodiments of the second aspect of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic block diagram of a motor demagnetization protection circuit according to an embodiment of the present invention;
fig. 2 shows a circuit schematic diagram of a motor demagnetization protection circuit according to another embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A motor demagnetization protection circuit according to some embodiments of the present invention is described below with reference to fig. 1 and 2.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, a demagnetization protection circuit of a motor according to an embodiment of the present invention includes: the control module 10 is used for outputting a plurality of pulse modulation driving signals; the inverter module 20 comprises a plurality of paths of bridge arms, wherein the plurality of paths of bridge arms correspondingly receive the plurality of paths of pulse modulation driving signals and are used for inverting the plurality of paths of pulse modulation driving signals into control signals for controlling the motor to run; the overcurrent protection module 30 includes a plurality of electronic switches 302 and a detection submodule 304, the electronic switches 302 are respectively arranged corresponding to the plurality of bridge arms one by one, the detection submodule 304 is electrically connected to the inverter module 20 to collect a sampling signal of the inverter module 20, and the electronic switches 302 can control the plurality of bridge arms to be switched on or off according to a detection result of the detection submodule 304.
In this embodiment, since the output voltage of the inverter module 20 is directly used as the driving signal of the motor, whether the electromagnetic field of the motor is at risk of demagnetization is determined by detecting whether the output voltage of the inverter module 20 is normal, by adding the overcurrent protection module 30 between the control module 10 and the inverter module 20, the overcurrent protection module 30 includes a plurality of electronic switches 302 and a detection submodule 304, each electronic switch corresponds to a transmission path between the control module 10 and the inverter module 20, so as to control whether to output the multi-channel pulse modulation driving signal to the inverter module 20 through the on-off of the electronic switch, wherein the on-off of the electronic switch can be controlled by the output signal of the detection submodule 304, and when the output voltage of the inverter module 20 is detected to be abnormal, the pulse modulation driving signal is pulled down forcibly by controlling the electronic switch to be turned on, the multi-path bridge arm quick turn-off protection device has the advantages that the multi-path bridge arm quick turn-off is realized, the occurrence of overcurrent is prevented, the demagnetization protection of the magnet in the motor rotor is realized, the structure is simple, the preparation cost is low, and the reliability is high.
Wherein, control module 10 includes singlechip (MCU), and MCU can embed the drive IC who is used for PWM (pulse width modulation), also can use with drive IC combination, compares with prior art, and drive IC inside no longer need built-in protection circuit.
In the above embodiment, preferably, the inverter module 20 further includes a sampling resistor RS for acquiring the motor control voltage of the inverter module 20 as a sampling signal; the detection submodule 304 includes a comparator U1, a first input terminal of the comparator U1 inputs a motor control voltage, a second input terminal of the comparator U1 inputs a demagnetization protection threshold voltage, the plurality of electronic switches 302 are a plurality of diodes arranged in parallel, anodes of the plurality of diodes are correspondingly connected to a connection point of each path between the control module 10 and the inverter module 20, and cathodes of the plurality of diodes are connected to an output terminal of the comparator U1, wherein when the motor control voltage is detected to be greater than the demagnetization protection threshold voltage, the comparator U1 outputs a low level, the plurality of diodes are turned on, and the multi-path bridge arm is turned off.
In this embodiment, as a simplest and most reliable setting manner of the electronic switch, the electronic switch may be diodes with single-phase conduction characteristics, and the number of the diodes is the same as that of the transmission paths, wherein the diodes may be a single integrated diode or two in-phase conventional diodes, when the circuit normally works, the multiple diodes are turned off to perform the signal isolation function, and when the overcurrent phenomenon occurs, the cathode of the diode is pulled down to the low level, so as to realize the function of forcibly pulling down the 6 control signals in the abnormal situation.
Example two:
in any of the above embodiments, preferably, the output terminal of the comparator U1 is further connected to a control port of the control module 10, wherein when it is detected that the motor control voltage is greater than the demagnetization protection threshold voltage, the comparator U1 outputs a voltage abnormality signal to the control module 10, and the control module 10 stops outputting the multi-path pulse modulation driving signal according to the voltage abnormality signal.
In this embodiment, by providing a plurality of diodes, according to the turning state of the comparator U1, the multi-channel PWM signal is forced to be pulled down by hardware when a circuit abnormality occurs, thereby playing a role in protecting the compressor, further, by connecting the output terminal of the comparator U1 to the control port of the control module 10, when a circuit abnormality is detected (i.e., the motor control voltage is greater than the demagnetization protection threshold voltage), the output of the PWM signal is stopped by software control, thereby starting the hardware fast turn-off and then software switching of the driving signal, thereby implementing fast and effective protection of the compressor, and by the protection mode combining hardware control and software control, the reliability of the demagnetization protection is higher.
Specifically, the comparator U1 mainly achieves the purpose of signal inversion, and may be formed by a single comparator U1 or an odd number (> ═ 1) of operational amplifier configurations, so as to achieve signal inversion through the setting of the comparator U1, and the demagnetization protection threshold voltage may be obtained through conventional resistance voltage division or through an equal proportion operational amplifier.
The demagnetization protection threshold voltage Vref can be obtained through conventional resistance voltage division or through equal proportion operational amplifier output. The diode D1 plays a role in forward overvoltage protection, the diode D8 plays a role in negative voltage protection, and a protected object is an I/O port of the MCU.
In any of the above embodiments, preferably, the detection sub-module 304 further includes: the output end of the comparator U1 is connected to the control port through a first resistor R1 and a first resistor R1; the other ends of the plurality of diodes are connected to a connection point between the first resistor R1 and the control port.
In this embodiment, the first resistor R1 is provided to perform RC filtering on the washed signal output from the comparator U1 to the control module 10, thereby facilitating improvement of the detection accuracy.
In any of the above embodiments, preferably, the detection sub-module 304 further includes: one end of a second resistor R2 and one end of a second resistor R2 are connected to the power supply, and the other end of the second resistor R2 is connected to one end, far away from the comparator U1, of the first resistor R1.
In this embodiment, by providing the second resistor R2, since the comparator U1 is an open output, a pull-up resistor needs to be connected, the second resistor R2 is determined as a pull-up resistor, and when no abnormality occurs, the output of the comparator U1 is clamped at a high level by the pull-up resistor, so that the diode is maintained in the off state.
In any of the above embodiments, preferably, the detection sub-module 304 further includes: and a first diode D1, wherein the anode of the first diode D1 is connected between the first resistor R1 and the control port, and the cathode of the first diode D1 is connected to the power supply, wherein when the output voltage of the output end of the comparator U1 is greater than the voltage of the power supply, the control port is over-voltage clamped through the first diode D1.
In any of the above embodiments, preferably, the detection sub-module 304 further includes: the parallel second diode D2 and the first capacitor C1, the parallel second diode D2 and one end of the first capacitor C1 are grounded, the parallel second diode D2 and the other end of the first capacitor C1 are connected between the first resistor R1 and the control module 10, and when the output voltage of the output end of the comparator U1 is greater than the voltage of the power supply, the control port is clamped by negative voltage through the second diode D2.
In this embodiment, by providing the first diode D1 and the second diode D2, respectively, the first diode D1 is used for forward overvoltage protection, the second diode D2 is used for negative voltage protection, and the protection object is an I/O port of the MCU.
In any of the above embodiments, preferably, the multi-way bridge arm comprises: 6 NMOS devices (N-channel MOS transistors), such as UH, VH, WH, UL, VL, and WL in the inverter module in fig. 2, gates of the NMOS devices are correspondingly connected to the driving port of the control module 10 to correspondingly receive the pulse modulation driving signal, drains of the NMOS devices are respectively connected to the output end of the inverter module 20, sources of the NMOS devices are respectively connected to one end of the sampling resistor RS, and the other end of the sampling resistor RS is grounded.
In this embodiment, the inverter module 20 is composed of 6 NMOS of upper and lower bridge arms, a sampling resistor RS is disposed between the ground terminal and the source of the NMOS, the total current on the bus is collected, and the compressor is controlled by an SPWM modulation method.
When the circuit normally works, six diodes are in a cut-off state, the protection circuit does not work, when the current value passing through the sampling resistor RS is larger than the demagnetization protection current threshold value of the compressor, the output of the comparator U1 is grounded, six driving ports UH, VH, WH, UL, VL and WL of the control module 10 are forcibly pulled to the ground through the diodes D3, D4, D5, D6, D7 and D8, meanwhile, the low level of the control ports is also detected through the MCU, and after internal processing of the MCU, a signal instruction for closing UH, VH, WH, UL, VL and WL is made, so that hardware is quickly turned off, then software switches driving signals, and quick and effective protection of the compressor is realized. Compared with the traditional IPM scheme and the DRIVER scheme of an internal integrated protection circuit, the method has the advantages of low cost and reliability.
In any of the above embodiments, preferably, the inverter module 20 further includes: and one end of a second capacitor C2, a second capacitor C2 is connected to the output end of the inverter module 20, and the other end of the second capacitor C2 is grounded.
According to the motor of the embodiment of the present invention, since the motor demagnetization protection circuit described in any of the above embodiments is provided, all the beneficial effects of the motor demagnetization protection circuit are achieved, and details are not repeated herein.
The compressor according to the embodiment of the invention comprises the motor according to the embodiment.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A motor demagnetization protection circuit, comprising:
the control module is used for outputting a pulse modulation driving signal;
the inverter module correspondingly receives the pulse modulation driving signal and is used for inverting the pulse modulation driving signal into a control signal for controlling the motor to run;
the overcurrent protection module comprises an electronic switch and a detection submodule, the electronic switch is arranged corresponding to the inverter module, the detection submodule is electrically connected with the inverter module so as to collect sampling signals of the inverter module, and the electronic switch can control the inverter module to be switched on or switched off according to a detection result of the detection submodule.
2. The protection circuit of claim 1,
the control module outputs a plurality of paths of pulse modulation driving signals;
the inverter module comprises a plurality of paths of bridge arms, and the plurality of paths of bridge arms correspondingly receive a plurality of paths of pulse modulation driving signals;
the electronic switches and the multi-path bridge arms are arranged one by one correspondingly so as to control the multi-path bridge arms to be switched on or off according to the detection result.
3. The protection circuit of claim 2,
the inverter module further comprises a sampling resistor, and the sampling resistor is used for collecting the motor control voltage of the inverter module as the sampling signal;
the detection submodule comprises a comparator, the first input end of the comparator inputs the motor control voltage, the second input end of the comparator inputs the demagnetization protection threshold voltage,
the electronic switches are diodes arranged in parallel, anodes of the diodes are correspondingly connected to the connection point of each passage between the control module and the inverter module, cathodes of the diodes are connected to the output end of the comparator,
when the motor control voltage is detected to be greater than the demagnetization protection threshold voltage, the comparator outputs a low level, the diodes are conducted, and the multi-path bridge arm is disconnected.
4. The protection circuit of claim 3,
the output of the comparator is also connected to the control port of the control module,
when the motor control voltage is detected to be greater than the demagnetization protection threshold voltage, the comparator outputs a voltage abnormal signal to the control module, and the control module controls to stop outputting the multi-path pulse modulation driving signal according to the voltage abnormal signal.
5. The protection circuit of claim 4, wherein the detection submodule further comprises:
the output end of the comparator is connected to the control port through the first resistor;
the other ends of the plurality of diodes are connected to a connection point between the first resistor and the control port.
6. The protection circuit of claim 5, wherein the detection submodule further comprises:
one end of the second resistor is connected to a power supply, and the other end of the second resistor is connected to one end, far away from the comparator, of the first resistor.
7. The protection circuit of claim 5, wherein the detection submodule further comprises:
a first diode having an anode connected between the first resistor and the control port and a cathode connected to a power supply,
wherein the control port is over-voltage clamped through the first diode when the output voltage of the output end of the comparator is greater than the voltage of the power supply.
8. The protection circuit of claim 7, wherein the detection submodule further comprises:
a second diode and a first capacitor which are connected in parallel, wherein one end of the second diode and one end of the first capacitor which are connected in parallel are grounded, the other end of the second diode and the other end of the first capacitor which are connected in parallel are connected between the first resistor and the control module,
when the output voltage of the output end of the comparator is larger than the voltage of the power supply, the control port is clamped by negative voltage through the second diode.
9. The protection circuit of claim 7, wherein the multi-way leg comprises:
the grid electrode of the NMOS device is correspondingly connected to the driving port of the control module so as to correspondingly receive the pulse modulation driving signal, the drain electrode of the NMOS device is respectively connected to the output end of the inverter module, the source electrode of the NMOS device is respectively connected to one end of the sampling resistor, and the other end of the sampling resistor is grounded.
10. The protection circuit according to any one of claims 1 to 9, wherein the inverter module further includes:
and one end of the second capacitor is connected to the output end of the inverter module, and the other end of the second capacitor is grounded.
11. An electric machine, comprising:
a motor demagnetization protection circuit according to any of claims 1 to 10.
12. A compressor, comprising:
the electric machine of claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437356.6A CN111244896A (en) | 2018-11-28 | 2018-11-28 | Motor demagnetization protection circuit, motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811437356.6A CN111244896A (en) | 2018-11-28 | 2018-11-28 | Motor demagnetization protection circuit, motor and compressor |
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| CN111244896A true CN111244896A (en) | 2020-06-05 |
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| CN (1) | CN111244896A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414747A (en) * | 2008-11-20 | 2009-04-22 | 宁波力达物流设备有限公司 | Overcurrent protective device for DC brush motor |
| CN203233140U (en) * | 2013-02-05 | 2013-10-09 | 广东美的电器股份有限公司 | Demagnetization protection circuit of compressor |
| CN204119020U (en) * | 2014-07-30 | 2015-01-21 | 美的集团股份有限公司 | A kind of PFC protective circuit and air conditioner |
| US20150285529A1 (en) * | 2014-04-03 | 2015-10-08 | Hangzhou Leaderway Electronics Co., Ltd. | Air conditioner controller, air conditioner control circuit and air conditioner control method |
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2018
- 2018-11-28 CN CN201811437356.6A patent/CN111244896A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414747A (en) * | 2008-11-20 | 2009-04-22 | 宁波力达物流设备有限公司 | Overcurrent protective device for DC brush motor |
| CN203233140U (en) * | 2013-02-05 | 2013-10-09 | 广东美的电器股份有限公司 | Demagnetization protection circuit of compressor |
| US20150285529A1 (en) * | 2014-04-03 | 2015-10-08 | Hangzhou Leaderway Electronics Co., Ltd. | Air conditioner controller, air conditioner control circuit and air conditioner control method |
| CN204119020U (en) * | 2014-07-30 | 2015-01-21 | 美的集团股份有限公司 | A kind of PFC protective circuit and air conditioner |
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Application publication date: 20200605 |
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