CN216122945U - Light source drive circuit, light source control circuit and electronic equipment - Google Patents
Light source drive circuit, light source control circuit and electronic equipment Download PDFInfo
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- CN216122945U CN216122945U CN202122018538.3U CN202122018538U CN216122945U CN 216122945 U CN216122945 U CN 216122945U CN 202122018538 U CN202122018538 U CN 202122018538U CN 216122945 U CN216122945 U CN 216122945U
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Abstract
The embodiment of the application provides a light source drive circuit, light source control circuit and electronic equipment, wherein, light source drive circuit includes: the digital-to-analog conversion chip and at least one path of voltage driving circuit; the digital-to-analog conversion chip comprises a digital signal input end and an analog signal output end, and the digital signal input end is connected to the voltage control end of the controller; the voltage driving circuit comprises a power management chip and an LED light source connected to the rear end of the power management chip; the power management chip comprises a voltage input end, a load end and a voltage regulation controlled end, wherein the voltage input end of the power management chip is connected to the voltage output end of the power conversion module, the load end of the power management chip is connected with the LED light source, and the voltage regulation controlled end of the power management chip is connected to the analog signal output end of the digital-to-analog conversion chip. The light source driving circuit has the advantages that the voltage output can be adjusted, and therefore the same driving circuit is suitable for multiple light sources.
Description
Technical Field
The embodiment of the application relates to the field of light source driving circuits, in particular to a light source driving circuit, a light source control circuit and electronic equipment.
Background
The LED has the advantages of energy conservation, environmental protection, long service life, easy control and the like, and is widely applied to various fields. The characteristics of the LED determine the need to maintain its brightness constant and prevent burning out, which requires constant current drive for the LED. Generally, the constant current driving circuit controls the brightness of the light source by changing the current flowing through the light source, and adjusts the output current of the constant current chip by adjusting the duty ratio of the PWM signal, wherein the larger the duty ratio is, the larger the output current is, the smaller the duty ratio is, and the smaller the output current is, thereby controlling the brightness of the light source. However, the output current of the constant current driving circuit can only be used for driving a single light source, and cannot be well adapted to other light sources.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the related art, the present application provides a light source driving circuit, a light source control circuit, and an electronic device, which have the advantage of being able to adjust the voltage output, thereby making the same driving circuit suitable for multiple light sources.
According to a first aspect of embodiments of the present application, there is provided a light source driving circuit, including: the digital-to-analog conversion chip and at least one path of voltage driving circuit; the digital-to-analog conversion chip comprises a digital signal input end and an analog signal output end, and the digital signal input end is connected to the voltage control end of the controller; the voltage driving circuit comprises a power management chip; the power management chip comprises a driving end, a voltage input end, a load end and a voltage regulation controlled end, wherein the voltage input end of the power management chip is connected to the voltage output end of the power conversion module, the load end of the power management chip is connected with the LED light source, the driving end of the power management chip is connected to the control signal output end of the controller, and the voltage regulation controlled end of the power management chip is connected to the analog signal output end of the digital-to-analog conversion chip.
According to a second aspect of the embodiments of the present application, there is provided a light source control circuit, including a controller, and the light source driving circuit as described in any one of the above embodiments; and a digital-to-analog conversion chip of the light source driving circuit is connected to a voltage control end of the controller.
According to a third aspect of the embodiments of the present application, there is provided an electronic device, comprising the light source control circuit and the LED light source as described in the above embodiments; the LED light source is connected to the load end of the power management chip of the light source control circuit.
Compared with the prior art, this application receives the voltage regulation signal of controller through digital-to-analog conversion chip, and voltage regulation signal conversion is analog signal output to voltage drive circuit, thereby make voltage drive circuit can adjust the voltage of its load end, thereby drive the LED light source and light, because the controller can export different voltage control signal, consequently voltage drive circuit's load end can form the not voltage source of equidimension, be convenient for drive different withstand voltage LED light source and light, and avoided when constant current source drive LED light source because the improper regulation of electric current size leads to the LED light source to burn out.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of a light source driving circuit according to an alternative embodiment of the present application;
FIG. 2 is a schematic block diagram of a light source driving circuit according to an alternative embodiment of the present application;
fig. 3 is a schematic connection diagram of a digital-to-analog conversion chip according to an alternative embodiment of the present application;
FIG. 4 is a schematic diagram of a connection of a power management chip according to an alternative embodiment of the present application;
FIG. 5 is a schematic diagram of the connection of a PWM driving and voltage sampling circuit according to an alternative embodiment of the present application;
FIG. 6 is a schematic diagram of a comparator according to an alternative embodiment of the present application;
fig. 7 is a schematic connection diagram of a PWM driving chip according to an alternative embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all 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.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.
In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The word "if/if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination". Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In a general constant current driving circuit, the brightness of a light source is controlled by changing the current flowing through the light source, the output current of a constant current chip is adjusted by adjusting the duty ratio of a PWM signal, the output current is larger when the duty ratio is larger, and the output current is smaller when the duty ratio is smaller, so that the brightness of the light source is controlled. However, the output current of the constant current driving circuit can only be used for driving a single light source, and cannot be well adapted to other light sources.
In view of the above technical problems, a first aspect of the embodiments of the present application provides a light source driving circuit.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic block diagram of a light source driving circuit according to an alternative embodiment of the present application; fig. 2 is a general schematic block diagram of a light source driving circuit according to an alternative embodiment of the present application.
The light source driving circuit comprises a digital-to-analog conversion chip 10 and at least one path of voltage driving circuit 20; the digital-to-analog conversion chip 10 includes a digital signal input terminal and an analog signal output terminal, and the digital signal input terminal is connected to a voltage control terminal of the controller 30; the voltage driving circuit 20 includes a power management chip 21, and the rear end of the power management chip 21 is connected with an LED light source 40. The power management chip 21 includes a driving end, a voltage input end, a load end and a voltage regulation controlled end, the voltage input end of the power management chip 21 is connected to the voltage output end of the power conversion module 50, the driving end thereof is connected to the control signal output port of the controller 30, the load end thereof is connected to the LED light source 40, and the voltage regulation controlled end thereof is connected to the analog signal output end of the digital-to-analog conversion chip 10.
Compared with the prior art, this application receives the voltage regulation signal of controller 30 through digital-to-analog conversion chip 10, and voltage regulation signal conversion is analog signal output to voltage drive circuit 20, thereby make voltage drive circuit 20 can adjust the voltage of its load end, thereby drive LED light source 40 and light, because controller 30 can export different voltage control signal, consequently voltage drive circuit 20's load end can form the voltage source of equidimension not, be convenient for drive different withstand voltage LED light source 40 and light, and because improper regulation that leads to the LED light source when having avoided the constant current source drive LED light source burns out.
Referring to fig. 3, fig. 3 is a schematic connection diagram of a digital-to-analog conversion chip according to an alternative embodiment of the present application.
In an optional embodiment, the digital signal input end of the digital-to-analog conversion chip 10 is DIN, the signal output port connected to the controller 30 receives the voltage regulation control signal, and the analog signal output end of the digital-to-analog conversion chip 10 is AO1-AO8, wherein the digital-to-analog conversion chip 10 receives the digital voltage regulation control signal and performs digital-to-analog conversion on the digital voltage regulation control signal to obtain a corresponding analog voltage signal, and AO1-AO4 may output a voltage of 0-3.3V to the power management chip 21 of each voltage driving circuit, so that the power management chip 21 regulates and outputs a corresponding voltage source to the LED light source 40; the AO5-AO8 can output 0-1.2V reference voltage to the inverting input end of the comparator of each voltage driving circuit, so that the comparator can obtain different reference voltages, and overcurrent protection of different values can be realized.
Referring to fig. 4, fig. 4 is a schematic connection diagram of a power management chip according to an alternative embodiment of the present application. In an alternative embodiment, the voltage input end VIN of the power management chip 21 is connected to a 28V dc power supply, the voltage output end VOUT _0 is connected to the LED light source 30 for outputting a corresponding voltage source to the LED light source 30 for driving and lighting, the driving end EN is connected to the control signal output port of the controller 30 to obtain a driving signal for controlling the output voltage source, and the voltage regulation controlled end FB is connected to the AO1 port of the digital-to-analog conversion chip 10 to obtain an analog voltage regulation signal converted by the digital-to-analog conversion chip 10, so as to control the voltage regulation output.
Referring to fig. 5 and 6, fig. 5 is a schematic connection diagram of a PWM driving and voltage sampling circuit according to an alternative embodiment of the present application; fig. 6 is a schematic diagram of a comparator according to an alternative embodiment of the present application.
In an alternative embodiment, in order to better control the voltage obtained across the LED light source 40, the voltage driving circuit 20 further includes a voltage sampling circuit, which includes a sampling element 23 and a comparator 22; the first end of the sampling element 23 is connected to the cathode of the LED light source 40, and the second end is grounded; the comparator 22 has a same-direction input end, an inverse-direction input end and a comparison result output end, the same-direction input end is connected with the first end of the sampling element 23 and the cathode of the LED light source 40, the inverse-direction input end is connected to the reference voltage output end of the digital-to-analog conversion chip 10, and the comparison result output end is connected to the signal input end of the controller 30. Optionally, the sampling element 23 may be a sampling resistor PR60 or PR 75.
Optionally, the non-inverting input terminal INA + of the comparator 22 is connected to the first terminal of the sampling resistor PR60 or PR75 and connected to the cathode of the LED light source 40, the inverting input terminal INA-of the comparator 22 is connected to the AO5 port of the digital-to-analog conversion chip 10 to obtain a reference voltage, and when the voltage value of the non-inverting input terminal INA + of the comparator 22 is greater than the reference voltage value of the inverting input terminal INA-, the comparison result output terminal 393_ OUT0 of the comparator 22 outputs a high level signal to the controller 30 to inform the controller 30 that the voltage value obtained by the LED light source 40 is higher, so that the controller 30 outputs a corresponding voltage regulating signal to control the output voltage of the voltage output terminal of the power management chip 10.
Referring to fig. 7, fig. 7 is a schematic connection diagram of a PWM driving chip according to an alternative embodiment of the present application. In order to adjust the brightness of the LED light source by the PWM signal, the voltage driving circuit in the present application further includes a PWM driving circuit, and the PWM driving circuit includes a PWM driving chip 24 and a switching tube 25.
The PWM driving chip 24 includes a PWM signal input terminal and a PWM signal output terminal, and the PWM signal input terminal is connected to the PWM control terminal of the controller 30; the switch tube 25 comprises an enable end, a current input end and a current output end, the negative electrode of the LED light source 40 passes through the current input end and the current output end and is grounded, and the enable end is connected to the PWM signal output end of the PWM driving chip 24.
The PWM signal input terminal IN + of the PWM driving chip 24 receives the PWM pulse modulation signal outputted from the controller 30, and outputs the PWM pulse modulation signal through OUT _ H or OUT _ L to drive the switching tube 25 to be turned on or off, and when the voltage value of the PWM pulse modulation signal outputted from the PWM driving chip 24 is higher than the on voltage of the switching tube 25, the switching tube 25 is turned on, so that the cathode of the LED light source 40 is connected to the ground, even if the LED light source 40 obtains power lighting. At this time, the blinking frequency of the LED light source 40 may be determined according to the duty ratio of the PWM pulse modulation signal, and the larger the duty ratio, the larger the blinking frequency of the LED light source 40, and the smaller the duty ratio, the smaller the blinking frequency of the LED light source 40, thereby achieving the control of the luminance of the LED light source 40.
The switch tube 25 may be a switch conducting device such as an MOS tube or a triode, and in an optional embodiment, the switch tube 25 is an N-channel MOS tube; the enabling end of the switch tube is a grid G of the N-channel MOS tube; the input end of the switch tube is the drain electrode D of the N-channel MOS tube; the output end of the switch tube is the source electrode S of the N-channel MOS tube.
In an optional embodiment, the system further comprises a power conversion module; the power conversion module 50 comprises a conversion circuit 51 and a boost chip 52; the conversion circuit 51 is connected to an alternating current power supply to obtain an alternating current power supply, the boosting chip 52 is connected to the rear end of the conversion circuit 51 to obtain a +12V- +24V direct current power supply, the voltage input end of the power management chip 10 passes through the boosting chip 52, and the conversion circuit 51 is connected to the alternating current power supply to obtain electricity.
Compared with the prior art, this application receives the voltage regulation signal of controller through digital-to-analog conversion chip, and voltage regulation signal conversion is analog signal output to voltage drive circuit, thereby make voltage drive circuit can adjust the voltage of its load end, thereby drive the LED light source and light, because the controller can export different voltage control signal, consequently voltage drive circuit's load end can form the not voltage source of equidimension, be convenient for drive different withstand voltage LED light source and light, and avoided when constant current source drive LED light source because the improper regulation of electric current size leads to the LED light source to burn out.
In a second aspect of the embodiments of the present application, there is provided a light source control circuit, including a controller 30, and the light source driving circuit as described in any one of the above embodiments; the digital-to-analog conversion chip 10 of the light source driving circuit is connected to the voltage control end of the controller 30 to obtain a voltage regulation signal, so as to regulate the output voltage of the load end of the power management chip 21, thereby realizing the control of the brightness of the LED light source 40.
The controller 30 may be any device that can implement the technical solution of the present application, and may include one or more processing cores, for example, it may be implemented by a microcontroller MCU or other devices, and the specific type and model thereof are not limited in the present application.
In an alternative embodiment, the light source driving circuit includes four voltage driving circuits; the digital-to-analog conversion chip is provided with four analog signal output ports; the voltage regulation controlled ends of the four voltage driving circuits are respectively and correspondingly connected with the analog signal output ports of the digital-to-analog conversion chips, and the output voltages of the four voltage driving circuits can be different or the same, so that the brightness control of the same light source driving circuit on LED light sources with different rated voltages is realized.
In a third aspect of the embodiments of the present application, there is provided an electronic device, including the light source control circuit and the LED light source as described in the above embodiments; the LED light source is connected to the load end of the power management chip of the light source control circuit.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A light source driving circuit, comprising: the digital-to-analog conversion chip and at least one path of voltage driving circuit;
the digital-to-analog conversion chip comprises a digital signal input end and an analog signal output end, and the digital signal input end is connected to the voltage control end of the controller;
the voltage driving circuit comprises a power management chip; the power management chip comprises a driving end, a voltage input end, a load end and a voltage regulation controlled end, wherein the voltage input end of the power management chip is connected to the voltage output end of the power conversion module, the load end of the power management chip is connected with the LED light source, the driving end of the power management chip is connected to the control signal output end of the controller, and the voltage regulation controlled end of the power management chip is connected to the analog signal output end of the digital-to-analog conversion chip.
2. The light source driving circuit according to claim 1, wherein the voltage driving circuit further comprises a voltage sampling circuit including a sampling element and a comparator; the first end of the sampling element is connected to the cathode of the LED light source, and the second end of the sampling element is grounded; the comparator is provided with a same-direction input end, a reverse input end and a comparison result output end, the same-direction input end is connected with the first end of the sampling element and the cathode of the LED light source, the reverse input end is connected to the reference voltage output end of the digital-to-analog conversion chip, and the comparison result output end is connected to the signal input end of the controller.
3. The light source driving circuit according to claim 2, wherein the sampling element is a sampling resistor.
4. The light source driving circuit according to claim 1, wherein the voltage driving circuit further comprises a PWM driving circuit, and the PWM driving circuit comprises a PWM driving chip and a switching tube;
the PWM driving chip comprises a PWM signal input end and a PWM signal output end, and the PWM signal input end is connected to a PWM control end of the controller;
the switch tube comprises an enabling end, a current input end and a current output end, the negative electrode of the LED light source passes through the current input end and the current output end is grounded, and the enabling end is connected to the PWM signal output end of the PWM driving chip.
5. The light source driving circuit according to claim 4, wherein the switching transistor is a MOS transistor; the enabling end of the switch tube is the grid electrode of the MOS tube; the input end of the switching tube is the drain electrode of the MOS tube; the output end of the switch tube is the source electrode of the MOS tube.
6. The light source driving circuit according to claim 1, further comprising a power conversion module; the power supply conversion module comprises a conversion circuit and a boosting chip; the voltage input end of the power management chip is connected to an alternating current power supply through the voltage boosting chip and the conversion circuit.
7. A light source control circuit comprising a controller, and a light source driving circuit according to any one of claims 1 to 6;
and a digital-to-analog conversion chip of the light source driving circuit is connected to a voltage control end of the controller.
8. The light source control circuit of claim 7, wherein the light source driving circuit comprises four voltage driving circuits; the digital-to-analog conversion chip is provided with four analog signal output ports;
and the voltage regulation controlled ends of the four voltage driving circuits are respectively and correspondingly connected with the analog signal output port of the digital-to-analog conversion chip.
9. An electronic device comprising the light source control circuit of any one of claims 7 to 8 and an LED light source; the LED light source is connected to the load end of the power management chip of the light source control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122018538.3U CN216122945U (en) | 2021-08-25 | 2021-08-25 | Light source drive circuit, light source control circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122018538.3U CN216122945U (en) | 2021-08-25 | 2021-08-25 | Light source drive circuit, light source control circuit and electronic equipment |
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| CN216122945U true CN216122945U (en) | 2022-03-22 |
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| CN202122018538.3U Active CN216122945U (en) | 2021-08-25 | 2021-08-25 | Light source drive circuit, light source control circuit and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822441A (en) * | 2022-05-09 | 2022-07-29 | 京东方科技集团股份有限公司 | Drive circuit, source drive chip and display device |
| CN115633420A (en) * | 2022-09-30 | 2023-01-20 | 苏州艾微视图像科技有限公司 | Multi-channel adjustable light source control system and control method |
-
2021
- 2021-08-25 CN CN202122018538.3U patent/CN216122945U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822441A (en) * | 2022-05-09 | 2022-07-29 | 京东方科技集团股份有限公司 | Drive circuit, source drive chip and display device |
| CN115633420A (en) * | 2022-09-30 | 2023-01-20 | 苏州艾微视图像科技有限公司 | Multi-channel adjustable light source control system and control method |
| CN115633420B (en) * | 2022-09-30 | 2023-09-29 | 苏州艾微视图像科技有限公司 | Multichannel adjustable light source control system and control method |
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