A method for protecting multiple outputs of an LED power supply
By introducing multiple protection circuits and microcontroller control into the LED power supply, the short-circuit or overload current is detected and reduced, solving the problem of device damage in LED dimming driver power supplies under high voltage output. This achieves flexible and precise protection for LED power supplies, adapts to the technical problem of power device damage under short-circuit or overload faults, and solves the safety hazards of LED power supplies.
Patent Information
- Application Number
- CN202110590569.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-05-28
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2041-05-28
AI Technical Summary
Existing LED dimming driver power supplies are prone to damage to output power devices when short-circuited at high voltage output, especially when pulse width PWM dimming is used and the dimming signal is small, which poses a safety hazard.
The system employs multiple protection circuits and a microcontroller digital control circuit. It detects short circuits or overload conditions by sampling current signals, and controls the first and second protection circuits and the microcontroller respectively to reduce the instantaneous peak current or current magnitude and cut off the drive signal of the power device to achieve protection.
It achieves flexible and precise protection for the output channel, avoids damage to power devices, ensures power supply safety, and adapts to short circuit or overload faults without affecting other normal channels.
Smart Images
Figure CN113260119B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of lamp equipment, in particular to a method for protecting multi-output of LED power supply. BACKGROUND
[0002] In the existing market, most of the LED dimming power supplies are damaged when the output voltage is high and the output short circuit is used, especially when the dimming signal is small and the output power device is damaged, and the power supply is kept short circuit output for a long time, which is easy to cause safety hazards. SUMMARY
[0003] The purpose of the present application is to provide a method for protecting multi-output of LED power supply, which solves the technical problem of easy damage of output power device.
[0004] To achieve the above purpose, the present application is realized by the following technical scheme:
[0005] A method for protecting multi-output of LED power supply, comprising the following steps:
[0006] Step one, install the first protection circuit on one side of the output power device;
[0007] Step two, install the second protection circuit on one side of the output power device, and install the second protection circuit on one side of the output power device;
[0008] Step three, install the single-chip microcomputer circuit on one side of the second protection circuit;
[0009] Step four, install the sampling circuit on one side of the power device, install the sampling circuit on one side of the single-chip microcomputer, and install the sampling circuit on one side of the first protection circuit;
[0010] Step five, install the driver main circuit on one side of the output power device, and install the lamp on one side of the output power device.
[0011] Optionally, when an output channel is in short circuit output, the sampling circuit transmits the detected instantaneous peak current sampling signal to the first protection circuit, and the first protection circuit reduces the size of the instantaneous peak current after receiving the sampling signal, thereby reducing the probability of damage to the output power device.
[0012] Optionally, when two or N output channels are in short circuit output, the sampling circuit of each channel transmits the detected instantaneous peak current sampling signal to the first protection circuit of each channel, and after receiving the sampling signal, the first protection circuit of each channel pulls down the driving signal of the output power device of each channel, reduces the size of the instantaneous peak current of each channel, and reduces the probability of damage of the output power device.
[0013] Optionally, the lamp includes: a power supply positive port V+, a first power supply negative port V-(1), a second power supply negative port V-(2) located on one side of the first power supply negative port V-(1), a third power supply negative port V-(3) located on one side of the second power supply negative port V-(2), a fourth power supply negative port V-(4) located on one side of the third power supply negative port V-(3), and a fifth power supply negative port V-(5) located on one side of the fourth power supply negative port V-(4).
[0014] Optionally, the first power supply negative port V-(1) and the power supply positive port are connected with a first capacitor and a first diode, the first power supply negative port V-(1) is connected with a first resistor, a first transistor, a second resistor, and a first capacitor, one end of the first capacitor is connected with a first conversion circuit, one end of the first conversion circuit is connected with a third resistor, one end of the second resistor is connected with a second transistor, the other end of the second resistor is connected with a fourth resistor, one end of the fourth resistor is connected with the first power supply negative port V-(1), the other end of the fourth resistor is connected with a third transistor, one end of the third transistor is connected with the first power supply negative port V-(1), the other end of the third transistor is connected with a fourth transistor and a fifth resistor, one end of the fifth resistor is connected with a sixth resistor, one end of the sixth resistor is connected with a first circuit, one end of the second transistor is connected with a first square wave signal PWM and a seventh resistor, one end of the seventh resistor is connected with a first voltage VCC, and one end of the seventh resistor is connected with the fourth transistor.
[0015] Optionally, the second power supply negative port V-(2) and the power supply positive port are connected with a second capacitor and a second diode, the eighth resistor, the fifth transistor, the ninth resistor and the third capacitor are connected to the second power supply negative port V-(2), one end of the third capacitor is connected to a second conversion circuit, one end of the second conversion circuit is connected to the tenth resistor, one end of the ninth resistor is connected to the sixth transistor, the other end of the ninth resistor is connected to the eleventh resistor, one end of the eleventh resistor is connected to the second conversion circuit, one end of the seventh transistor is connected to the second power supply negative port V-(2), the other end of the seventh transistor is connected to the eighth transistor and the twelfth resistor, one end of the twelfth resistor is connected to the thirteenth resistor, one end of the thirteenth resistor is connected to the second circuit, one end of the sixth transistor is connected to the second square wave signal PWM and the fourteenth resistor, one end of the fourteenth resistor is connected to the second voltage VCC, and one end of the fourteenth resistor is connected to the eighth transistor.
[0016] Optionally, the method for LED power supply multi-output protection according to claim 2, wherein the third power supply negative port V-(3) and the power supply positive port are connected with a fourth capacitor and a third diode, the fifteenth resistor, the ninth transistor, the sixteenth resistor and the fifth capacitor are connected to the third power supply negative port V-(3), one end of the fifth capacitor is connected to a third conversion circuit, one end of the third conversion circuit is connected to the seventeenth resistor, one end of the sixteenth resistor is connected to the tenth transistor, the other end of the sixteenth resistor is connected to the eighteenth resistor, one end of the eighteenth resistor is connected to the third conversion circuit, one end of the third conversion circuit is connected to the eleventh transistor, one end of the eleventh transistor is connected to the third power supply negative port V-(3), the other end of the eleventh transistor is connected to the twelfth transistor and the nineteenth resistor, one end of the nineteenth resistor is connected to the twentieth resistor, one end of the twentieth resistor is connected to the third circuit, one end of the tenth transistor is connected to the third square wave signal PWM and the twenty-first resistor, one end of the twenty-first resistor is connected to the third voltage VCC, and one end of the twenty-first resistor is connected to the twelfth transistor.
[0017] Optionally, the fourth power negative port V-(4) and the power positive port are connected with the sixth capacitor and the fourth diode, the fourth power negative port V-(4) is connected with the twenty-second resistor, the thirteenth transistor, the twenty-third resistor, the seventh capacitor, one end of the seventh capacitor is connected with the fourth conversion circuit, one end of the fourth conversion circuit is connected with the twenty-fourth resistor, one end of the twenty-third resistor is connected with the fourteenth transistor, the other end of the twenty-third resistor is connected with the twenty-fifth resistor, one end of the twenty-fifth resistor is connected with the fourth conversion circuit, one end of the fourth conversion circuit is connected with the fifteenth transistor, one end of the fifteenth transistor is connected with the fourth power negative port V-(4), the other end of the fifteenth transistor is connected with the sixteenth transistor and the twenty-ninth resistor, one end of the twenty-ninth resistor is connected with the thirtieth resistor, one end of the thirtieth resistor is connected with the fourth circuit, one end of the fourteenth transistor is connected with the fourth square wave signal PWM and the thirty-first resistor, one end of the thirty-first resistor is connected with the fourth voltage VCC, and one end of the thirty-first resistor is connected with the sixteenth transistor.
[0018] Optionally, the fifth power negative port V-(5) and the power positive port are connected with the eighth capacitor and the fifth diode, the fifth power negative port V-(5) is connected with the twenty-seventh resistor, the seventeenth transistor, the twenty-sixth resistor and the ninth capacitor, one end of the ninth capacitor is connected with the fifth conversion circuit, one end of the fifth conversion circuit is connected with the twenty-eighth resistor, one end of the twenty-sixth resistor is connected with the twentieth transistor, the other end of the twenty-sixth resistor is connected with the thirty-third resistor, one end of the thirty-third resistor is connected with the fifth conversion circuit, one end of the fifth conversion circuit is connected with the eighteenth transistor, one end of the eighteenth transistor is connected with the fifth power negative port V-(5), the other end of the eighteenth transistor is connected with the nineteenth transistor and the thirty-second resistor, one end of the thirty-second resistor is connected with the thirty-fifth resistor, one end of the thirty-fifth resistor is connected with the fifth circuit, one end of the twentieth transistor is connected with the fifth square wave signal PWM and the thirty-fourth resistor, one end of the thirty-fourth resistor is connected with the fifth voltage VCC, and one end of the thirty-fourth resistor is connected with the nineteenth transistor.
[0019] The embodiment of the present application has the following beneficial effects:
[0020] One embodiment of the present application can change the working mode of protection, such as the lockout mode and the hiccup mode, according to the protection requirements, and is flexible and arbitrary, and when one or more output channels are in short circuit or overload failure, it does not affect other normal output channels, and the combination of the single-chip microcomputer and the digital control protection circuit can achieve more accurate and consistent protection effect.
[0021] Of course, implementing any of the products of the present application does not necessarily require that all of the advantages described above be achieved simultaneously. BRIEF DESCRIPTION OF DRAWINGS
[0022] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, illustrate preferred embodiments of the application and assist in
[0023] Figure 1 Flow chart of the method for LED power supply multi-output protection according to an embodiment of the present application;
[0024] Figure 2 Circuit schematic diagram according to an embodiment of the present application;
[0025] Figure 3 Single-chip microcomputer internal circuit schematic diagram according to an embodiment of the present application;
[0026] Figure 4 Schematic diagram of the first power supply negative port V-(1) in the Figure 2
[0027] Schematic diagram of the second power supply negative port V-(2) in the Figure 5 Figure 2 Schematic diagram of the third power supply negative port V-(3) in the
[0028] Figure 6 Figure 2 Schematic diagram of the fourth power supply negative port V-(4) in the
[0029] Figure 7 Schematic diagram of the fifth power supply negative port V-(5) in the Figure 2
[0030] Schematic diagram of the fifth power supply negative port V-(5) in the Figure 8 DETAILED DESCRIPTION Figure 2 The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means constitutes any limitation on the present application and its application or use.
[0031] In order to keep the following description of the embodiments of the present application clear and brief, the detailed description of known functions and known components is omitted in the present application.
[0032] In order to keep the following description of the embodiments of the present application clear and brief, the detailed description of known functions and known components is omitted in the present application.
[0033] Please refer to Figures 1-8 In the embodiment shown, a method for LED power supply multi-output protection is provided, which comprises the following steps:
[0034] Step one, the first protection circuit installation: the first protection circuit is installed on one side of the output power device;
[0035] Step two, the second protection circuit installation: the output power device drive circuit is installed on one side of the second protection circuit, and the second protection circuit is installed on one side of the output power device;
[0036] Step three, the single-chip microcomputer circuit installation: the single-chip microcomputer is installed on one side of the second protection circuit;
[0037] Step four, the sampling circuit installation: the sampling circuit is installed on one side of the power device, the sampling circuit is installed on one side of the single-chip microcomputer, and the sampling circuit is installed on one side of the first protection circuit;
[0038] Step five, the driver main circuit installation: the driver main circuit is installed on one side of the output power device, and the lamp is installed on one side of the output power device.
[0039] When one output channel is in short-circuit output, the sampling circuit transmits the detected instantaneous peak current sampling signal to the first protection circuit, the first protection circuit receives the sampling signal, and then pulls down the drive signal of the output power device, reduces the size of the instantaneous peak current, and reduces the probability of damage to the output power device. At the same time, the sampling circuit transmits the detected instantaneous peak current sampling signal to the single-chip microcomputer, and the single-chip microcomputer receives the short-circuit instantaneous peak current sampling signal, starts the second protection circuit, and then cuts off the drive signal of the output power device, so as to shut off the output of the power device, achieve the protection purpose, and restore to the normal state after the LED driving power supply is powered off and then powered on. If the output is still in a short-circuit fault state after being powered on, the above steps are repeated, the LED power supply output enters the protection state again, and the short-circuit fault is removed;
[0040] When two or N output channels are in short-circuit output, the sampling circuit of each channel transmits the detected instantaneous peak current sampling signal to the first protection circuit of each channel, the first protection circuit of each channel receives the sampling signal, and then pulls down the drive signal of the output power device of each channel, reduces the size of the instantaneous peak current of each channel, and reduces the probability of damage to the output power device. At the same time, the sampling circuit of each channel transmits the detected instantaneous peak current sampling signal to the single-chip microcomputer, and the single-chip microcomputer receives the short-circuit instantaneous peak current sampling signal of each channel, starts the second protection circuit of each channel, and then cuts off the drive signal of the output power device of each channel, so as to shut off the output of the power device of each channel, achieve the protection purpose, and restore to the normal state after the LED driving power supply is powered off and then powered on. If the output is still in a short-circuit fault state after being powered on, the above steps are repeated, the LED power supply output enters the protection state again, and the short-circuit fault is removed;
[0041] Similarly, this method is also applicable to the overload protection of each channel. When two or some output channels are in overload output, the sampling circuit of each channel transmits the detected overload current sampling signal to the first protection circuit of each channel. After the first protection circuit of each channel receives the sampling signal, it will pull down the driving signal of the output power device of each channel to reduce the size of the overload current of each channel. At the same time, the sampling circuit of each channel transmits the detected overload current sampling signal to the single-chip microcomputer. After the single-chip microcomputer receives the overload current sampling signal of each channel, it starts the second protection circuit of each channel. The second protection circuit of each channel then cuts off the driving signal of the output power device of each channel, thereby shutting off the output of the power device of each channel to achieve the protection purpose. Until the LED driving power supply is powered off and then powered on, the normal state is restored. If the output is still in the overload fault state after power-on, the above steps are repeated, the LED power supply output enters the protection state again, and the overload fault is removed.
[0042] Through the sampling single-chip microcomputer digital control circuit, the working mode of protection can be arbitrarily changed according to the protection requirements, such as lockout mode, hiccup mode, etc. It is flexible and easy to change. When one or more output channels are in short circuit or overload fault, it does not affect other normal output channels. Combined with the digital control protection circuit of the single-chip microcomputer, more accurate and consistent protection effect can be achieved.
[0043] As shown in Figure 2 The lamp includes a power supply positive port V+, a first power supply negative port V-(1), a second power supply negative port V-(2) located on one side of the first power supply negative port V-(1), a third power supply negative port V-(3) located on one side of the second power supply negative port V-(2), a fourth power supply negative port V-(4) located on one side of the third power supply negative port V-(3), and a fifth power supply negative port V-(5) located on one side of the fourth power supply negative port V-(4).
[0044] As shown in Figure 4As shown, the first power negative port V- (1) and the power positive port are connected with the first capacitor C30, the first diode D8, the first power negative port V- (1) is connected with the first resistor R53, the first transistor Q15 and the second resistor R54, one end of the first capacitor C30 is connected with the first conversion circuit ADC1, one end of the first conversion circuit ADC1 is connected with the third resistor R1, one end of the second resistor R54 is connected with the second transistor Q12, the other end of the second resistor R54 is connected with the fourth resistor R23, one end of the fourth resistor R23 is connected with the first power negative port V- (1), the other end of the fourth resistor R23 is connected with the third transistor Q13, one end of the third transistor Q13 is connected with the first power negative port V- (1), the other end of the third transistor Q13 is connected with the fourth transistor Q11 and the fifth resistor R90, one end of the fifth resistor R90 is connected with the sixth resistor R91, one end of the sixth resistor R91 is connected with the single-chip microcomputer first protection driving signal CTL_1, one end of the second transistor Q12 is connected with the first square wave signal PWM and the seventh resistor R89, one end of the seventh resistor R89 is connected with the first voltage VCC, one end of the seventh resistor R89 is connected with the fourth transistor Q11, the first voltage VCC passes through the seventh resistor R89, the seventh resistor R89 drives the fourth transistor Q11 to be turned on, after the second transistor Q12 is turned on, the first square wave signal PWM passes through the second resistor R54 and the fourth resistor R23 to form a driving voltage VCC, which drives the first transistor Q15 to be turned on, at this time, the power positive port V+ and the first power negative port V- (1) normally output the LED power voltage, when the power positive port and the first power negative port V- (1) are short-circuited, the transient short-circuit current of the first power negative port V- (1) increases sharply, the sampling voltage VCC of the first resistor R53 connected with the first transistor Q15 rises sharply, at this time, the sampling voltage VCC reaches the driving threshold of the third transistor Q13 in the first protection circuit, the third transistor Q13 is turned on, the driving signal first square wave signal PWM of the output power device first transistor Q15 is pulled down to 0 potential, the first transistor Q15 is temporarily turned off, the transient short-circuit current is reduced, and the first protection is formed, secondly, while the first protection circuit works, the sampling voltage VCC flows through the low-pass filter circuit formed by the third resistor R1 and the first capacitor C30, and then the sampling signal is transmitted to the ADC sampling pin 14 of the single-chip microcomputer, after software identification processing, the single-chip microcomputer drives the pin 10 to output the first protection driving voltage signal to the sixth resistor R91 and the fifth resistor R90,At this time, the fourth transistor Q11 is turned on, and the fourth transistor Q11 lowers the driving first voltage VCC of the second transistor Q12 to 0 potential after being turned on, so that the second transistor Q12 is cut off, the first square wave signal PWM is cut off, the driving output power device first transistor Q15 loses the driving signal, the first transistor Q15 is cut off, and the output channel is cut off, so as to achieve the second protection.
[0045] As shown in the embodiment, Figure 5 The second power negative port V-(2) is connected with the power positive port through a second capacitor and a second diode, the eighth resistor, the fifth transistor, the ninth resistor and the third capacitor are connected to the second power negative port V-(2), one end of the third capacitor is connected to the second conversion circuit, one end of the second conversion circuit is connected to the tenth resistor, one end of the ninth resistor is connected to the sixth transistor, the other end of the ninth resistor is connected to the eleventh resistor, one end of the eleventh resistor is connected to the second conversion circuit, one end of the seventh transistor is connected to the second conversion circuit, one end of the seventh transistor is connected to the second power negative port V-(2), the other end of the seventh transistor is connected to the eighth transistor and the twelfth resistor, one end of the twelfth resistor is connected to the thirteenth resistor, one end of the thirteenth resistor is connected to the second circuit, one end of the sixth transistor is connected to the second square wave signal PWM and the fourteenth resistor, one end of the fourteenth resistor is connected to the second voltage VCC, and one end of the fourteenth resistor is connected to the eighth transistor, when a short circuit occurs, the circuit diagram and the above-mentioned circuit Figure 1 The above-mentioned steps can be referred to.
[0046] As shown in the embodiment, Figure 6 The third power negative port V-(3) is connected with the power positive port through a fourth capacitor and a third diode, the fifteenth resistor, the ninth transistor, the sixteenth resistor and the fifth capacitor are connected to the third power negative port V-(3), one end of the fifth capacitor is connected to the third conversion circuit, one end of the third conversion circuit is connected to the seventeenth resistor, one end of the sixteenth resistor is connected to the tenth transistor, the other end of the sixteenth resistor is connected to the eighteenth resistor, one end of the eighteenth resistor is connected to the third conversion circuit, one end of the third conversion circuit is connected to the eleventh transistor, one end of the eleventh transistor is connected to the third power negative port V-(3), the other end of the eleventh transistor is connected to the twelfth transistor and the nineteenth resistor, one end of the nineteenth resistor is connected to the twentieth resistor, one end of the twentieth resistor is connected to the third circuit, one end of the tenth transistor is connected to the third square wave signal PWM and the twenty-first resistor, one end of the twenty-first resistor is connected to the third voltage VCC, and one end of the twenty-first resistor is connected to the twelfth transistor, when a short circuit occurs, the circuit diagram and the above-mentioned circuit Figure 1Therefore, you can refer to the steps above.
[0047] In this embodiment, such as Figure 7 As shown, a sixth capacitor and a fourth diode are connected between the fourth power supply negative port V-(4) and the power supply positive port. A twenty-second resistor, a thirteenth transistor, a twenty-third resistor, and a seventh capacitor are connected to the fourth power supply negative port V-(4). One end of the seventh capacitor is connected to a fourth conversion circuit. One end of the fourth conversion circuit is connected to a twenty-fourth resistor. One end of the twenty-third resistor is connected to a fourteenth transistor. The other end of the twenty-third resistor is connected to a twenty-fifth resistor. One end of the twenty-fifth resistor is connected to the fourth conversion circuit. One end of the fourth conversion circuit is connected to a tenth... Five transistors, one end of the fifteenth transistor is connected to the fourth power supply negative terminal V-(4), the other end of the fifteenth transistor is connected to the sixteenth transistor, the twenty-ninth resistor, one end of the twenty-ninth resistor is connected to the thirtieth resistor, one end of the thirtieth resistor is connected to the fourth circuit, one end of the fourteenth transistor is connected to the fourth square wave signal PWM, the thirty-first resistor, one end of the thirty-first resistor is connected to the fourth voltage VCC, one end of the thirty-first resistor is connected to the sixteenth transistor. When a short circuit occurs, this circuit diagram and the above circuit Figure 1 Therefore, you can refer to the steps above.
[0048] In this embodiment, such as Figure 8 As shown, the fifth power supply negative port V-(5) is connected to the power supply positive port, and the eighth capacitor and the fifth diode are connected to it. The fifth power supply negative port V-(5) is connected to the twenty-seventh resistor, the seventeenth transistor, the twenty-sixth resistor, and the ninth capacitor. One end of the ninth capacitor is connected to the fifth conversion circuit. One end of the fifth conversion circuit is connected to the twenty-eighth resistor. One end of the twenty-sixth resistor is connected to the twentieth transistor. The other end of the twenty-sixth resistor is connected to the thirty-third resistor. One end of the thirty-third resistor is connected to the fifth conversion circuit. One end of the fifth conversion circuit is connected to the tenth... Eight transistors are connected. One end of the eighteenth transistor is connected to the negative terminal of the fifth power supply, V-(5). The other end of the eighteenth transistor is connected to the nineteenth transistor and the thirty-second resistor. One end of the thirty-second resistor is connected to the thirty-fifth resistor. One end of the thirty-fifth resistor is connected to the fifth circuit. One end of the twentieth transistor is connected to the fifth square wave signal PWM and the thirty-fourth resistor. One end of the thirty-fourth resistor is connected to the fifth voltage VCC. One end of the thirty-fourth resistor is connected to the nineteenth transistor. When a short circuit occurs, this circuit diagram and the above circuit... Figure 1 Therefore, you can refer to the steps above.
[0049] The above embodiments can be combined with each other.
[0050] It should be noted that the terms "first", "second", and the like, in the description and in the claims of the present application as well as above-mentioned figures imply that similar objects do not necessarily have to be present in any given order. Understanding in this regard can be interchanged in suitable cases, so that the embodiments of the present application described herein can be implemented in other sequences than those depicted or described herein.
[0051] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.
Claims
1. A method for LED power supply multi-output protection, characterized in that, It comprises the following steps: Step one, first protection circuit installation: install the first protection circuit on one side of the output power device; Step two, second protection circuit installation: install the output power device drive circuit on one side of the second protection circuit, and install the second protection circuit on one side of the output power device; Step three, single-chip microcomputer circuit installation: install the single-chip microcomputer on one side of the second protection circuit; Step four, sampling circuit installation: install the sampling circuit on one side of the power device, install the sampling circuit on one side of the single-chip microcomputer, and install the sampling circuit on one side of the first protection circuit; Step five, driver main circuit installation: install the driver main circuit on one side of the output power device, and install the lamp on one side of the output power device; When one or N output channels are in short-circuit output, the sampling circuit of each channel transmits the detected instantaneous peak current sampling signal to the first protection circuit of each channel; Wherein, after receiving the sampling signal, the first protection circuit of each channel pulls down the drive signal of the output power device, reduces the size of the instantaneous peak current, and reduces the probability of damage to the output power device. At the same time, the sampling circuit transmits the detected instantaneous peak current sampling signal to the single-chip microcomputer. After receiving the short-circuit instantaneous peak current sampling signal, the single-chip microcomputer starts the second protection circuit of each channel. The second protection circuit cuts off the drive signal of the output power device, thereby shutting off the power device output to achieve the protection purpose. Until the LED drive power supply is powered off and then powered on, the normal state is restored. If the output is still in a short-circuit fault state after power-on, the above steps are repeated, the LED power supply output enters the protection state again, and the short-circuit fault is removed.
2. The method of claim 1, wherein, The lamp comprises: The power supply positive port V+, the first power supply negative port, the second power supply negative port located on one side of the first power supply negative port, the third power supply negative port located on one side of the second power supply negative port, the fourth power supply negative port located on one side of the third power supply negative port, and the fifth power supply negative port located on one side of the fourth power supply negative port.
3. The method of claim 1, wherein the LED power supply multi-output protection is characterized by, The first capacitor and the first diode are connected between the first power supply negative port and the power supply positive port. The first resistor, the first transistor, the second resistor, and the first capacitor are connected on the first power supply negative port. One end of the first capacitor is connected with the first conversion circuit. One end of the first conversion circuit is connected with the third resistor. One end of the second resistor is connected with the second transistor. The other end of the second resistor is connected with the fourth resistor, and one end of the fourth resistor is connected with the first power supply negative port. The other end of the fourth resistor is connected with the third transistor. One end of the third transistor is connected with the first power supply negative port. The other end of the third transistor is connected with the fourth transistor and the fifth resistor. One end of the fifth resistor is connected with the sixth resistor. One end of the sixth resistor is connected with the first circuit. One end of the second transistor is connected with the first square wave signal PWM and the seventh resistor. One end of the seventh resistor is connected with the first voltage VCC, and one end of the seventh resistor is connected with the fourth transistor.
4. The method of claim 3, wherein, The second power negative port is connected with the power positive port with the second capacitor and the second diode, the eighth resistor, the fifth transistor, the ninth resistor and the third capacitor are connected on the second power negative port, one end of the third capacitor is connected with the second conversion circuit, one end of the second conversion circuit is connected with the tenth resistor, one end of the ninth resistor is connected with the sixth transistor, the other end of the ninth resistor is connected with the eleventh resistor, one end of the eleventh resistor is connected with the second conversion circuit, one end of the second conversion circuit is connected with the seventh transistor, one end of the seventh transistor is connected with the second power negative port, the other end of the seventh transistor is connected with the eighth transistor and the twelfth resistor, one end of the twelfth resistor is connected with the thirteenth resistor, one end of the thirteenth resistor is connected with the second circuit, one end of the sixth transistor is connected with the second square wave signal PWM and the fourteenth resistor, one end of the fourteenth resistor is connected with the second voltage VCC, and the other end of the fourteenth resistor is connected with the eighth transistor.
5. The method of claim 1, wherein, The third power negative port is connected with the power positive port with the fourth capacitor and the third diode, the fifteenth resistor, the ninth transistor, the sixteenth resistor and the fifth capacitor are connected on the third power negative port, one end of the fifth capacitor is connected with the third conversion circuit, one end of the third conversion circuit is connected with the seventeenth resistor, one end of the sixteenth resistor is connected with the tenth transistor, the other end of the sixteenth resistor is connected with the eighteenth resistor, one end of the eighteenth resistor is connected with the third conversion circuit, one end of the third conversion circuit is connected with the eleventh transistor, one end of the eleventh transistor is connected with the third power negative port, the other end of the eleventh transistor is connected with the twelfth transistor and the nineteenth resistor, one end of the nineteenth resistor is connected with the twentieth resistor, one end of the twentieth resistor is connected with the third circuit, one end of the tenth transistor is connected with the third square wave signal PWM and the twenty-first resistor, one end of the twenty-first resistor is connected with the third voltage VCC, and the other end of the twenty-first resistor is connected with the twelfth transistor.
6. The method of claim 1, wherein, The fourth power negative port is connected with the sixth capacitor and the fourth diode between the power positive port, the fourth power negative port is connected with the twenty-second resistance, the thirteenth transistor, the twenty-third resistance and the seventh capacitor, one end of the seventh capacitor is connected with the fourth conversion circuit, one end of the fourth conversion circuit is connected with the twenty-fourth resistance, one end of the twenty-third resistance is connected with the fourteenth transistor, the other end of the twenty-third resistance is connected with the twenty-fifth resistance, one end of the twenty-fifth resistance is connected with the fourth conversion circuit, one end of the fourth conversion circuit is connected with the fifteenth transistor, one end of the fifteenth transistor is connected with the fourth power negative port, the other end of the fifteenth transistor is connected with the sixteenth transistor and the twenty-ninth resistance, one end of the twenty-ninth resistance is connected with the thirtieth resistance, one end of the thirtieth resistance is connected with the fourth circuit, one end of the fourteenth transistor is connected with the fourth square wave signal PWM and the thirty-first resistance, one end of the thirty-first resistance is connected with the fourth voltage VCC and the sixteenth transistor.
7. The method of claim 1, wherein the LED power supply multi-output protection is characterized by, The fifth power negative port is connected with the eighth capacitor and the fifth diode between the power positive port, the fifth power negative port is connected with the twenty-seventh resistance, the seventeenth transistor, the twenty-sixth resistance and the ninth capacitor, one end of the ninth capacitor is connected with the fifth conversion circuit, one end of the fifth conversion circuit is connected with the twenty-eighth resistance, one end of the twenty-sixth resistance is connected with the twentieth transistor, the other end of the twenty-sixth resistance is connected with the thirty-third resistance, one end of the thirty-third resistance is connected with the fifth conversion circuit, one end of the fifth conversion circuit is connected with the eighteenth transistor, one end of the eighteenth transistor is connected with the fifth power negative port, the other end of the eighteenth transistor is connected with the nineteenth transistor and the thirty-second resistance, one end of the thirty-second resistance is connected with the thirty-fifth resistance, one end of the thirty-fifth resistance is connected with the fifth circuit, one end of the twentieth transistor is connected with the fifth square wave signal PWM and the thirty-fourth resistance, one end of the thirty-fourth resistance is connected with the fifth voltage VCC and the nineteenth transistor.
Citation Information
Patent Citations
High-voltage and high-power motor drive protection system and method
CN108270203A