Lamp panel circuit

Abstract

The invention provides a lamp panel circuit which comprises a detection power supply input port and a detection power supply return port. The detection power supply input port is connected with a detection power supply; the detection signal input port of the control switch unit is connected with the detection power supply return port, the driving power supply input port is connected with the driving power supply, and the driving power supply output port is connected with the driving power supply interface. And a loop is formed through the plugging of the lamp panel terminal and the detection power supply, so that the power supply of the LED lamp panel is completed, and no surge is generated.

Description

A light board circuit

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application number 202211136666.0, filed on September 19, 2022, entitled “LED light board surge protection circuit”. Technical Field

[0003] The present disclosure relates to the field of LED displays, and in particular to a light emitting diode (LED) lamp board circuit. Background Art

[0004] With the rapid development of science and technology, light emitting diode (LED) lamps are popular among people because they are superior to other types of lamps in terms of energy saving, environmental protection, color rendering and response speed.

[0005] LED displays are usually composed of multiple LED panels, which are connected through panel terminals. To ensure the overall display effect of the display, LED panels are usually installed through hot-swap, that is, they are installed under power.

[0006] Summary of the Invention

[0007] The disclosed embodiment provides a lamp board circuit for solving the problem that during hot plugging of existing LED lamp boards, the driving power interface is connected first and the ground interface is connected later, which causes surge.

[0008] In a first aspect, some embodiments of the present disclosure provide a light board circuit, comprising: a light board terminal, a control switch unit;

[0009] The lamp board terminal includes a detection power input port, a detection power return port and a driving power interface, the detection power input port is located at the first end of the light board terminal, and the detection power return port is located at the second end of the light board terminal; the detection power input port is connected to the detection power; the detection signal input port of the control switch unit is connected to the detection power return port, the driving power input port of the control switch unit is connected to the driving power, and the driving power output port of the control switch unit is connected to the driving power interface; when the plug of the LED lamp board is fully inserted into the light board terminal, the detection power input port is connected to the detection power return port, and the detection power return port outputs a first detection signal; when the control switch unit receives the first detection signal, it connects the driving power and the driving power interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described below are some embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0011] FIG1 is a schematic diagram of a spliced ​​display device provided according to some embodiments of the present disclosure;

[0012] FIG2 is a schematic diagram of a non-display surface of a light panel according to one or more embodiments of the present disclosure;

[0013] FIG3 is a schematic diagram of a detection circuit according to one or more embodiments of the present disclosure;

[0014] FIG4 is a schematic diagram of another detection circuit according to one or more embodiments of the present disclosure;

[0015] FIG5 is a schematic diagram of another detection circuit according to one or more embodiments of the present disclosure;

[0016] FIG6 a is a schematic diagram of another detection circuit according to one or more embodiments of the present disclosure;

[0017] FIG6 b is a schematic diagram of an OC gate structure according to one or more embodiments of the present disclosure;

[0018] FIG7 is a schematic diagram of a detection circuit according to one or more embodiments of the present disclosure;

[0019] FIG8 is a schematic diagram of another detection circuit according to one or more embodiments of the present disclosure;

[0020] FIG9 is a schematic diagram of a detection circuit according to one or more embodiments of the present disclosure. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments made by ordinary technicians in this field based on the inspiration of these embodiments shall fall within the scope of protection of the present disclosure.

[0022] The terms "first," "second," "third," "fourth," and the like (if any) in the specification and claims of the present disclosure and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] With the rapid development of science and technology and the improvement of people's living standards, the frequency of use of light emitting diode (LED) display screens is increasing. Figure 1 provides a structural schematic diagram of a spliced ​​display device. Usually, an LED display screen 10 is composed of a plurality of LED light panels 100, and each light panel is connected through a light panel terminal and a plug. In order to achieve the overall display effect of the display screen, the LED light panel is usually installed by hot plugging, that is, it is installed under power. The light panel terminal includes a driving power interface and a ground interface. Due to improper operation of the staff, the driving power interface of the light panel terminal and the plug may be connected first, and the ground interface may be connected later, resulting in surge problems.

[0024] During the research on surge protection of LED light panels, the inventors discovered that based on the existing plug and light panel terminal, when the light panel terminal and the driving power interface of the plug are connected first and the ground interface is connected later, a surge will be generated; however, when the light panel terminal and the ground interface of the plug are connected first and the driving power interface is connected later, or when the driving power interface and the ground interface are connected at the same time, no surge will be generated. That is, after the ground interface is connected, there is current in the driving power interface, and no surge will be generated. Therefore, a detection power input port and a detection power return port are added to the light panel terminal. The detection power input port is located at the first end of the light panel terminal, and the detection power return port is located at the second end of the light panel terminal. The detection power input port is connected to the detection power supply; the detection signal input port of the control switch unit is connected to the detection power return port, the driving power input port of the control switch unit is connected to the driving power supply, and the driving power output port of the control switch unit is connected to the driving power interface.

[0025] Before the plug of the LED light board is inserted into the light board terminal, only the detection power input port in the light board terminal has voltage. When the plug of the LED light board is fully inserted into the light board terminal, that is, when the plug is connected to the driving power interface and the ground interface of the light board terminal, the detection power input port in the light board terminal is connected to the detection power return port, so that the detection power return port can output a detection signal, and then the detection signal emitted by the detection power passes through the detection power input port and the detection power return port in sequence to reach the control switch unit, and then the control switch unit connects the driving power and the driving power interface to complete the power supply of the LED light board. At this time, since the ground interface is already connected, no surge will be generated. Based on the above-mentioned inventive concept, the LED light board surge protection circuit disclosed in this disclosure is designed.

[0026] In some embodiments, an LED display screen composed of multiple LED light boards is displaying content, but one of the LED light boards fails and needs to be replaced with a new LED light board. Each LED light board has the LED light board surge protection circuit disclosed in the present invention.

[0027] When the LED display screen is displaying content, after the plug of the new LED light board is fully inserted into the light board terminal of the installed LED light board, the detection signal emitted by the detection power supply passes through the detection power input port and the detection power return port in the light board terminal in sequence and reaches the control switch unit.

[0028] The control switch unit connects the driving power supply and the driving power supply interface to complete the power supply of the new LED light board. At this time, since the ground interface has been connected, no surge will be generated.

[0029] It should be noted that the above scenario is only an example of an application scenario provided by the embodiment of the present disclosure. The embodiment of the present disclosure does not limit the actual form of the various devices included in the scenario, nor does it limit the interaction method between the devices. In the specific application of the solution, it can be set according to actual needs.

[0030] The technical solution of the present disclosure is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0031] Figure 2 is a schematic block diagram of the non-display surface of a light board according to one or more embodiments of the present disclosure. Light board 100 is provided with light board terminals 11, which correspond to terminals on the display device (not shown). After the light board terminals 11 are installed, the light board is powered and displays are generated.

[0032] FIG3 is a schematic structural diagram of an LED light board surge protection circuit according to one or more embodiments of the present disclosure. As shown in FIG1 , the LED light board surge protection circuit includes: a light board terminal 11 and a control switch unit 12 .

[0033] In some embodiments, the lamp board terminal 11 is set on the lamp board, and the detection circuit connected to the lamp board terminal 11 is set on the display device side corresponding to the lamp board 100, but this application does not limit this, as long as the detection function can be realized.

[0034] In some embodiments, the lamp board terminal 11 includes a detection power input port 111, a detection power return port 112 and a driving power interface 113. The detection power input port 111 is located at the first end of the lamp board terminal 11, and the detection power return port 112 is located at the second end of the lamp board terminal 11. The detection power input port 111 and the detection power return port 112 are located at both ends of the light board terminal 11.

[0035] The detection power input port 111 is connected to the detection power supply 13 and is configured to supply power after the lamp board terminal 11 is inserted into the display device side terminal.

[0036] The detection signal input port 121 of the control switch unit 12 is connected to the detection power return port 112, and is configured to receive the detection power signal returned by the lamp board terminal 11; the driving power input port 122 of the control switch unit 12 is connected to the driving power supply 14, and the driving power output port 123 of the control switch unit 12 is connected to the driving power interface 113, and is configured to control the switch unit to be turned on and the driving power supply 14 to power the LED when the signal of the detection signal input port 121 is at a high level.

[0037] FIG3 shows only one driving power interface. In some embodiments, the number of driving power interfaces is at least one. The embodiment of the present disclosure does not limit the number of driving power interfaces, which can be determined according to actual conditions.

[0038] When the plug of the LED lamp board is fully inserted into the lamp board terminal 11, the detection power input port 111 and the detection power return port 112 are connected to the detection circuit, so that the first detection signal emitted by the detection power supply 13 passes through the detection power input port 111 and the detection power return port 112 in the lamp board terminal 11 in sequence and reaches the detection signal input port 121 of the control switch unit 12.

[0039] Then, the switch unit 12 is controlled to connect the driving power supply 14 to the driving power supply interface 113 in the lamp board terminal 11 to light the lamp board when the first detection signal is received through the detection signal input port 121. At this time, the ground interface in the lamp board terminal is already connected, and no surge is generated.

[0040] It should be noted that the first detection signal is a high-level signal.

[0041] When there is no detection circuit involved in the interface on the side of the lamp board terminal 11, the detection circuit does not form a loop and cannot be turned on. At this time, the control switch unit will not be turned on, so the lamp board will not be lit, preventing the occurrence of surge phenomenon.

[0042] The LED light board surge protection circuit provided by the present disclosure adds a detection power input port and a detection power return port to the light board terminal. The detection power input port is located at the first end of the light board terminal, and the detection power return port is located at the second end of the light board terminal. Only when the plug of the LED light board is fully inserted into the light board terminal can the detection power input port and the detection power return port be connected. The detection power return port outputs a first detection signal. At this time, the plug and the driving power interface and the ground interface in the light board terminal are also connected. Then, when the control switch unit receives the first detection signal, it connects the driving power and the driving power interface to supply power to the LED light board. Since the plug and the driving power interface and the ground interface in the light board terminal are already connected when power is supplied, no surge will be generated, thereby achieving surge protection when the LED light board is installed with power.

[0043] FIG4 is a schematic structural diagram of a surge protection circuit for a light panel provided in some embodiments of the present disclosure, wherein the control switch unit is a direct current (DC / DC) conversion chip.

[0044] The enable interface 211 of the DCDC chip 21 is connected to the detection power return port 112 of the lamp board terminal 11 , the driving power input port 212 of the DCDC chip 21 is connected to the driving power 14 , and the driving power output port 213 of the DCDC chip 21 is connected to the driving power interface 113 of the lamp board terminal 11 .

[0045] Since the DCDC chip 21 works only when the level of the enable interface is high, the driving power supply 14 is connected to the driving power interface 113. Therefore, when the plug of the LED lamp board is fully inserted into the lamp board terminal 11, the detection power input port 111 and the detection power return port 112 are connected, so that the first detection signal emitted by the detection power supply 13, that is, the high-level signal, passes through the detection power input port 111 and the detection power return port 112 in the lamp board terminal 11 in sequence and reaches the enable interface 211 of the DCDC chip 21.

[0046] Then, when the DCDC chip 21 receives a high level signal through the enable interface 211, it connects the driving power supply 14 to the driving power interface 113 in the lamp board terminal 11. At this time, the ground interface in the lamp board terminal is already connected, and no surge will be generated.

[0047] When the LED light board's plug is fully inserted into the board's terminals, the detection power input port connects to the detection power return port, and the detection power return port outputs a high-level signal. At this point, the plug is also connected to the drive power interface and ground interface in the board's terminals. When the DCDC chip receives a high-level signal through the enable interface, it connects the drive power interface and provides power to the LED light board. Since the plug is already connected to the drive power interface and ground interface in the board's terminals during power supply, no surge is generated, thus achieving surge protection during live installation of the LED light board.

[0048] FIG5 is a schematic structural diagram of an LED light panel surge protection circuit provided in some embodiments of the present disclosure, wherein the control switch unit is a metal-oxide semiconductor field-effect transistor (MOS tube for short).

[0049] 5 , the surge protection circuit of the LED lamp board includes: a MOS tube 31 .

[0050] The gate 311 of the MOS transistor 31 is connected to the detection power return port 122 of the lamp board terminal 11 , the source 312 of the MOS transistor 31 is connected to the driving power supply 14 , and the drain 313 of the MOS transistor 31 is connected to the driving power interface 113 of the lamp board terminal 11 .

[0051] It should be noted that the MOS transistor is an N-channel MOS transistor.

[0052] When the gate 311 of the MOS transistor 31 is at a high level, the source 312 and drain 313 of the MOS transistor 31 are conductively connected, thereby connecting the driving power supply 14 to the driving power supply interface 113. Therefore, when the LED light board plug is fully inserted into the light board terminal 11, the detection power input port 111 and the detection power return port 112 are connected, so that the first detection signal emitted by the detection power supply 13, that is, the high-level signal, passes through the detection power input port 111 and the detection power return port 112 in the light board terminal 11 in sequence and reaches the gate 311 of the MOS transistor 31.

[0053] Then, when the MOS tube 31 receives a high level signal through the gate 311, it connects the driving power supply 14 with the driving power interface 113 in the lamp board terminal 11. At this time, the ground interface in the lamp board terminal is already connected, and no surge will be generated.

[0054] The LED light board surge protection circuit provided in this embodiment connects the detection power input port and the detection power return port when the LED light board plug is fully inserted into the light board terminal. The detection power return port outputs a high-level signal. At this time, the plug is also connected to the drive power interface and ground interface in the light board terminal. When the MOS transistor receives the high-level signal through the gate, the drive power is connected to the drive power interface, powering the LED light board. Because the plug is already connected to the drive power interface and ground interface in the light board terminal during power supply, no surge is generated, thus achieving surge protection when the LED light board is installed with power.

[0055] FIG6 a is a schematic structural diagram of a light board surge protection circuit provided in some embodiments of the present disclosure. Referring to FIG6 a , the light board surge protection circuit further includes a buffer unit.

[0056] The detection signal input port 411 of the buffer unit 41 is connected to the detection power return port 112 , and the detection signal output port 412 of the buffer unit 41 is connected to the detection signal input port 121 of the control switch unit 12 .

[0057] Because the first detection signal is a high-level signal, directly reaching the detection signal input port 121 of the control switch unit 12 from the detection power return port 112 may damage the control switch unit 12, or the first detection signal may contain interference signals, causing interference to the control switch unit 12. Therefore, a buffer unit 41 is added between the detection power return port 112 of the lamp board terminal 11 and the detection signal input port 121 of the control switch unit 12.

[0058] After receiving the first detection signal, the detection signal input port 411 of the buffer unit 41 is buffered and filtered to obtain a second detection signal. The second detection signal is the buffered first detection signal and remains a high-level signal. The second detection signal is then output to the detection signal input port 121 of the control switch unit 12 through the detection signal output port 412 of the buffer unit 41. When the detection signal input port 121 of the control switch unit 12 receives the second detection signal (i.e., a high-level signal), it connects the drive power supply 14 to the drive power supply interface 113 of the lamp board terminal 11.

[0059] In some embodiments, the buffer unit 41 is an open collector (OC) gate.

[0060] Figure 6b is a schematic diagram of an OC gate structure provided in some embodiments of the present disclosure. Referring to Figure 6b, the first end of first resistor 401 is connected to the detection signal input port, and the second end of first resistor 401 is connected to the base of first transistor 402. The first end of second resistor 403 is connected to a high-level power supply, and the second end of second resistor 403 is connected to the collector of first transistor 402 and the base of second transistor 404, respectively. The first end of third resistor 405 is connected to a high-level power supply, and the second end of third resistor 405 is connected to the collector of second transistor 404 and the detection signal output port, respectively. The emitters of first transistor 402 and second transistor 404 are grounded. The detection signal input port of the OC gate is connected to the detection power return port 112 of lamp board terminal 11, and the detection signal output port of the OC gate is connected to the detection signal input port 121 of control switch unit 12.

[0061] When the detection signal input port is a high-level signal, it reaches the base of the first transistor 402. Since it is a high-level signal, the emitter and collector of the first transistor 402 are disconnected, and the base of the second transistor 404 is at a high level, which in turn disconnects the emitter and collector of the second transistor 404, and the detection signal output port outputs a high-level signal.

[0062] In some embodiments, the buffer unit 41 is an edge detection circuit, the detection signal input port of the edge detection circuit is connected to the detection power return port 112 of the lamp board terminal 11, and the detection signal output port of the edge detection circuit is connected to the detection signal input port 121 of the control switch unit 12. The buffer unit 41 can also be a hot plug detection circuit, etc. The embodiments of the present disclosure do not limit the buffer unit, and it can be configured according to actual conditions.

[0063] The lamp board surge protection circuit provided by some embodiments of the present disclosure effectively improves the circuit safety, anti-interference capability and anti-damage capability by adding a buffer unit between the detection power return port of the lamp board terminal and the detection signal input port of the control switch unit.

[0064] FIG7 is a schematic structural diagram of a light board anti-surge circuit provided in some embodiments of the present disclosure, in which the light board anti-surge circuit includes an anti-shake unit.

[0065] 7 , the light board surge protection circuit includes an anti-shake unit 51 .

[0066] The first detection signal input port 511 of the anti-shake unit 51 is connected to the detection power return port 112 of the lamp board terminal 11; the second detection signal input port 512 of the anti-shake unit 51 is connected to the detection signal output port 412 of the buffer unit 41; the detection signal output port 513 of the anti-shake unit 51 is connected to the detection signal input port 121 of the control switch unit 12.

[0067] Because jitter may occur when the LED light board plug is connected to the light board terminal 11, which may cause the first detection signal output from the detection power return port of the light board terminal 11 to become unstable, an anti-shake unit 51 is added. The anti-shake unit 51 is used to output a third detection signal 621 when it receives both the first detection signal and the second detection signal. In other words, the third detection signal is output when both the first detection signal and the second detection signal are stable, and the third detection signal is still a high-level signal.

[0068] Furthermore, upon receiving the third detection signal, the control switch unit 12 connects the driving power supply 14 to the driving power supply interface 113 of the lamp board terminal 11 .

[0069] In some embodiments, the anti-shake unit is an AND gate, and the first detection signal input port of the AND gate is connected to the detection power return port 112 of the lamp board terminal 11; the second detection signal input port of the AND gate is connected to the detection signal output port 412 of the buffer unit 41; and the detection signal output port of the AND gate is connected to the detection signal input port 121 of the control switch unit 12.

[0070] In some embodiments, the anti-shake unit is a microcontroller unit (MCU), the first detection signal input port of the MCU is connected to the detection power return port 112 of the lamp board terminal 11; the second detection signal input port of the MCU is connected to the detection signal output port 412 of the buffer unit 41; the detection signal output port of the MCU is connected to the detection signal input port 121 of the control switch unit 12.

[0071] In some embodiments, the anti-shake unit is an anti-shake detection circuit. The embodiments of the present disclosure do not limit the anti-shake unit and can be set according to actual conditions.

[0072] The LED light board surge protection circuit provided by some embodiments of the present disclosure increases the anti-shake capability of the circuit by adding an anti-shake unit after the buffer unit and the detection power return port, so that the third detection signal is output only when the first detection signal and the second detection signal are stable.

[0073] FIG8 is a schematic structural diagram of a light board surge protection circuit provided in some embodiments of the present disclosure. The light board surge protection circuit includes a reset unit and an AND gate.

[0074] 8 , the lamp board surge protection circuit includes a reset unit 61 and an AND gate 62 , and the lamp board terminal 11 includes a driver interface 114 .

[0075] The detection signal input port 621 of the AND gate 62 is connected to the detection signal output port 513 of the anti-shake unit 51, the reset signal input port 622 of the AND gate 62 is connected to the reset unit 61, and the signal output port 623 of the AND gate 62 is respectively connected to the detection signal input port 121 of the control switch unit 12 and the driver interface 114 of the lamp board terminal 11.

[0076] Since if the LED lamp board first receives the reset signal generated by the reset unit, and then the driving power supply 14 is connected to the driving power interface 113 of the lamp board terminal 11, so that the LED lamp board is powered, the LED display screen will have abnormal graphics, so the AND gate 62 is added.

[0077] AND gate 62 is configured to simultaneously output the reset signal and the third detection signal when it receives both the reset signal output by reset unit 61 and the third detection signal. It does not output any signal when it receives only the third detection signal or only the reset signal. It outputs the reset signal and the third detection signal only when it receives both the third detection signal and the reset signal, that is, when both the third detection signal and the reset signal are stable. Upon receiving the third detection signal, control switch unit 12 connects drive power supply 14 to drive power supply interface 113 of lamp board terminal 11. Simultaneously, the reset signal reaches the driver in the LED lamp board via driver interface 114 of lamp board terminal 11. This allows the driver to synchronize with the controller after a successful reset, preventing any image anomalies.

[0078] Some embodiments of the present disclosure provide an LED light board surge protection circuit, which adds an AND gate to connect the anti-shake unit and the reset unit. When the LED light board is powered, the driver is reset, reducing the occurrence of image abnormalities.

[0079] FIG9 is a schematic diagram of a detection circuit according to one or more embodiments of the present disclosure.

[0080] 9 , it includes a buffer unit 41 , an anti-shake unit 51 and a control switch unit 12 .

[0081] The buffer unit 41 includes resistors R1, R2, R4, R5, R7, and a transistor M1.

[0082] The anti-shake unit 51 is an AND gate U1 .

[0083] The control switch unit 12 includes a voltage-dividing resistor R8 , a charging capacitor C2 , a switch field-effect transistor T2 , a voltage-dividing resistor R9 and a transistor M2 .

[0084] When the light board is fully inserted, node 112 reaches a high level. Voltage V2 acts as a pull-up / pull-down voltage, maintaining a high level. Resistors R1 and R2 act as a voltage divider, while resistors R4, R5, and R7 adjust the voltage at node EN1. When the light board is fully inserted, node 112 reaches a high level, transistor M1 turns on, and the voltage at node EN1 reaches a high level.

[0085] When EN1 and V1 are both high, AND gate U1 is turned on, EN2 node voltage is high, transistor M2 is turned on, and field effect transistor T2 is turned on, so that the driving power supply voltage can be transmitted to P2 to power the LED on the light board.

[0086] FIG9 is only a schematic diagram of a detection circuit provided in some embodiments of the present disclosure, and the present disclosure is not limited thereto, as long as the purpose of the present disclosure can be achieved.

[0087] In some embodiments, there may be multiple detection circuits, and the multiple detection circuits are connected to different driving power interfaces to drive the light board, which is not limited in the present disclosure.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A light board circuit, comprising: Light board terminals, control switch unit; The lamp board terminal includes a detection power input port, a detection power return port and a driving power interface, the detection power input port is located at the first end of the lamp board terminal, and the detection power return port is located at the second end of the lamp board terminal; The detection power input port is connected to the detection power supply; The detection signal input port of the control switch unit is connected to the detection power return port, the driving power input port of the control switch unit is connected to the driving power supply, and the driving power output port of the control switch unit is connected to the driving power interface; When the plug of the LED lamp board is fully inserted into the lamp board terminal, the detection power input port is connected to the detection power return port, and the detection power return port outputs a first detection signal; When the control switch unit receives the first detection signal, it connects the driving power supply with the driving power supply interface.

2. The circuit according to claim 1, wherein the control switch unit is a DC conversion (DCDC) chip; The enable interface of the DCDC chip is connected to the detection power return port, the driving power input port of the DCDC chip is connected to the driving power supply, and the driving power output port of the DCDC chip is connected to the driving power interface.

3. The circuit according to claim 1, wherein the control switch unit is a metal-oxide semiconductor field effect transistor (MOS); The gate of the MOS tube is connected to the detection power return port, the source of the MOS tube is connected to the driving power supply, and the drain of the MOS tube is connected to the driving power supply interface.

4. The circuit according to claim 1, further comprising a buffer unit; The detection signal input port of the buffer unit is connected to the detection power return port, and the detection signal output port of the buffer unit is connected to the detection signal input port of the control switch unit; The buffer unit is used to convert the first detection signal into a second detection signal for output; When the control switch unit receives the second detection signal, it connects the driving power supply with the driving power supply interface.

5. The circuit according to claim 4, further comprising an anti-shake unit; The first detection signal input port of the anti-shake unit is connected to the detection power return port; The second detection signal input port of the anti-shake unit and the detection signal output port of the buffer unit Port connection; The detection signal output port of the anti-shake unit is connected to the detection signal input port of the control switch unit; The anti-shake unit outputs a third detection signal when receiving both the first detection signal and the second detection signal; When the control switch unit receives the third detection signal, it connects the driving power supply with the driving power supply interface.

6. The circuit according to claim 4, wherein the buffer unit is an open collector OC gate; The detection signal input port of the OC gate is connected to the detection power return port, and the detection signal output port of the OC gate is connected to the detection signal input port of the control switch unit.

7. The circuit according to claim 4, wherein the buffer unit is an edge detection circuit; The detection signal input port of the edge detection circuit is connected to the detection power return port, and the detection signal output port of the edge detection circuit is connected to the detection signal input port of the control switch unit.

8. The circuit according to claim 5, wherein the anti-shake unit is an AND gate; The first detection signal input port of the AND gate is connected to the detection power return port; The second detection signal input port of the AND gate is connected to the detection signal output port of the buffer unit; The detection signal output port of the AND gate is connected to the detection signal input port of the control switch unit.

9. The circuit according to claim 5, wherein the anti-shake unit is a micro control unit (MCU); The first detection signal input port of the MCU is connected to the detection power return port; The second detection signal input port of the MCU is connected to the detection signal output port of the buffer unit; The detection signal output port of the MCU is connected to the detection signal input port of the control switch unit.

10. The circuit according to claim 5, further comprising a reset unit and an AND gate, and the lamp board terminal further comprising a driver interface; The detection signal input port of the AND gate is connected to the detection signal output port of the anti-shake unit, the reset signal input port of the AND gate is connected to the reset unit, and the signal output port of the AND gate is connected to the detection signal input port of the control switch unit and the driver interface respectively; When the AND gate receives both the reset signal output by the reset unit and the third detection signal, it simultaneously outputs the reset signal and the third detection signal.

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