Power supply control circuit, power supply system and display equipment

Abstract

The invention discloses a power supply control circuit, a power supply system and a display device, the power supply control circuit is applied to the power supply system, the power supply system comprises one or more power supply modules, and the power supply control circuit comprises a power supply input module, a power supply control module and a switching module which are connected in sequence; the switching module is used for being connected with one or more power supply modules; when the power supply input module is connected with a power supply, the switching module transmits electric energy input by the power supply input module to one or more power supply modules; and the power supply control module controls the on-off of an electric energy transmission path between the power supply input module and the switching module according to an external control signal. The problem of high standby power consumption in the existing display equipment can be relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a power supply control circuit, a power supply system and a display device. BACKGROUND

[0002] With the development of consumer electronics technology, there are dual demands of thinness and large screen for TV terminal products. In order to realize the appearance design of the whole machine thinness, the internal power supply architecture usually adopts flat layout, which leads to the significant increase of the single board area of the power supply printed circuit board (PCB). However, there is a physical limit (generally about 300 MM*450 MM) in the mainstream PCB manufacturing and assembly process, and when the single board area exceeds this limit, it cannot be produced through the conventional process.

[0003] Therefore, in order to meet the power output demand of the large-power TV whole machine, the multi-board partition power supply technology is adopted. Specifically, the complete power supply function is decomposed into two or more PCB boards, one of which is used as a main power supply board, and the other PCB boards are used as auxiliary power supply boards. For example, the A board (main power supply board) is responsible for accessing the alternating current mains and supplying power to the circuit of the core board; the B board (auxiliary power supply board, such as the backlight driving board) is specifically responsible for driving the high-power load (such as the LED backlight module). The A board and the B board are electrically connected through the power line, the A board transmits electric energy to the B board, and the working state of the integrated circuit on the B board is managed through the additional control line.

[0004] However, since the power supply of the B board directly comes from the power line output of the A board, the connection path remains conductive in the standby mode of the TV. This makes the high-voltage circuit and its associated elements on the B board side continuously generate power loss when in standby. Such loss is composed of direct loss caused by high voltage and indirect loss caused by part of the low-voltage standby circuit, and the more the number of sub-boards, the greater the cumulative loss. It directly leads to the fact that the standby power consumption of the whole machine system cannot meet the application requirement of low power consumption.

[0005] Therefore, the prior art still needs to be improved and enhanced. SUMMARY

[0006] The purpose of the present application is to provide a power supply control circuit, a power supply system and a display device, which can alleviate the problem of large standby power consumption in the current display device.

[0007] In order to achieve the above purpose, the following technical solutions are adopted in the present application: The power supply control circuit provided by the embodiment of the present application is applied to a power supply system, the power supply system includes one or more power supply modules, and the power supply control circuit includes a power supply input module, a power supply control module and a switching module connected in sequence. When the power input module is connected to a power source, the power input module inputs power, and the power is transmitted to one or more power modules by the adapter module; the power control module controls the on-off of the power transmission path between the power input module and the adapter module according to an external control signal.

[0008] In some embodiments, the power control circuit, the power control module includes a switching unit and a switching control unit, the switching unit is connected with the switching control unit, the switching unit is connected with the power input module and the adapter module respectively; When the external control signal is a first level signal, the switching control unit controls the switching unit to turn on the power transmission path between the power input module and the adapter module according to the first level signal; When the external control signal is a second level signal, the switching control unit controls the switching unit to turn off the power transmission path between the power input module and the adapter module according to the second level signal.

[0009] In some embodiments, the power control circuit, the power control circuit further includes a protection unit and a protection control unit, the protection control unit is connected with the protection unit and the switching control unit, the protection unit is connected with the adapter module and the power input module respectively; The protection control unit controls the protection unit to enter a protection state according to the first level signal, and controls the protection unit to exit the protection state after a preset time, and controls the switching control unit to turn on the power transmission path.

[0010] In some embodiments, the power control circuit, the protection control unit includes a control subunit and a delay subunit, the control subunit and the delay subunit are connected, and the delay subunit is connected with the switching control unit; The control subunit controls the protection unit to enter a protection state according to the first level signal, and controls the delay subunit to delay the preset time, so that the switching control unit controls the power transmission path to be turned on.

[0011] In some embodiments, the power control circuit, the protection unit includes a protection subunit and a switching subunit, the protection subunit and the switching subunit are connected, and the switching subunit is further connected with the protection control unit; The protection control unit controls the switching subunit to connect the protection subunit between the adapter module and the power input module according to the first level signal, and the protection subunit suppresses electromagnetic interference.

[0012] The power supply control circuit in some embodiments, the control subunit includes a first resistor, a second resistor, a first capacitor and a first switch tube, one end of the first resistor is used for accessing a control signal, the other end of the first resistor is connected with the first end of the first switch tube, the second end of the first switch tube is grounded, the third end of the first switch tube is connected with the delay subunit, the protection unit and the switch unit, one end of the second resistor and one end of the first capacitor are both connected with the first end of the first switch tube, the other end of the second resistor and the other end of the first capacitor are both grounded.

[0013] The power supply control circuit in some embodiments, the delay subunit includes a second capacitor, a third capacitor, a third resistor, a fourth resistor and a voltage stabilizing diode, one end of the second capacitor, one end of the third capacitor and one end of the fourth resistor are all connected with electricity, the other end of the second capacitor, the other end of the third capacitor and the positive electrode of the voltage stabilizing diode are all connected with one end of the third resistor, the other end of the third resistor is connected with the third end of the first switch tube; the negative electrode of the voltage stabilizing diode and the other end of the fourth resistor are both connected with the switch control unit.

[0014] The power supply control circuit in some embodiments, the switch subunit includes a first switch device, the seventh pin and the eighth pin of the first switch device are both connected with the protection control unit, the fifth pin and the sixth pin of the first switch device are both connected with electricity, the first pin and the second pin of the first switch device are both connected with the switching module, the third pin and the fourth pin of the first switch device are both connected with the protection subunit.

[0015] The power supply control circuit in some embodiments, the protection subunit includes a first thermistor and a second thermistor, one end of the first thermistor is connected with the power input module, the other end of the first thermistor is connected with one end of the second thermistor, the other end of the second thermistor is connected with the switch subunit.

[0016] The power supply control circuit in some embodiments, the switch unit includes a second switch device, the fifth pin and the sixth pin of the second switch device are both connected with the switch control unit, the seventh pin and the eighth pin of the second switch device are both grounded, the first pin and the second pin of the second switch device are connected with the switching module, the third pin and the fourth pin of the second switch device are both connected with the power input module.

[0017] The power supply control circuit in some embodiments, the switch control unit includes a second switch tube, the first end of the second switch tube is used for accessing a control signal, the second end of the second switch tube is connected with electricity, the third end of the second switch tube is connected with the fifth pin and the sixth pin of the second switch device.

[0018] The power supply control circuit in some embodiments, the power input module includes a first connection interface, the first pin and the second pin of the first connection interface are used for connecting with the live wire of the power supply, the third pin and the fourth pin of the first connection interface are used for connecting with the zero line of the power supply.

[0019] The power supply control circuit in some embodiments, the adapter module includes a second connection interface, the first pin and the second pin of the second connection interface are connected with the power input module, the third pin and the fourth pin of the second connection interface are connected with the switch unit.

[0020] The embodiment of the present application further provides a power supply system, the power supply system comprises: A first power board, the first power board is provided with the power supply control circuit; One or more second power boards, the second power board is provided with a power module, and the power module is connected with the power supply control circuit.

[0021] The embodiment of the present application further provides a display device, the display device comprises the power supply system.

[0022] The embodiment of the present application provides a power supply control circuit, a power supply system and a display device, the power supply control circuit comprises a power input module, a power control module and an adapter module connected in sequence. Wherein, the adapter module is used for being connected with one or more power modules, so as to transmit the electric energy input by the power input module to the power module in the second power board; the power control module is used for controlling the on-off of the electric energy transmission path between the power input module and the adapter module according to the external control signal. When the power supply system is applied to the display device, the display device enters the standby state, then the power control module can control the electric energy transmission path between the power input module and the adapter module to be disconnected according to the external control signal, so as to be equivalent to directly disconnecting the second power board, reducing the power consumption of the circuit or other devices in the second power board, so as to reduce the standby power consumption of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structural block diagram of the power supply system provided by the embodiment of the present application is shown.

[0024] Figure 2 The structural block diagram of the power supply control circuit provided by the embodiment of the present application is shown.

[0025] Figure 3 The first structural block diagram of the power control module in the power supply control circuit provided by the embodiment of the present application is shown.

[0026] Figure 4 The second structural block diagram of the power control module in the power supply control circuit provided by the embodiment of the present application is shown.

[0027] Figure 5 The primary and secondary schematic diagrams of the first power board and the second power board in the power supply system provided by the embodiment of the present application are shown.

[0028] Figure 6The structural block diagram of the protection unit and the protection control unit in the power supply control circuit provided by the embodiment of the present application is shown.

[0029] Figure 7 The circuit schematic diagram of the power supply control circuit provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] The present application aims to provide a power supply control circuit, an antenna device and an electronic device, which can alleviate the problem that the current antenna design cannot achieve the expected receiving gain, and is beneficial to improve the overall performance of the antenna system.

[0031] In order to make the purpose, technical solutions and effects of the present application clearer and more explicit, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0032] Please refer to Figure 1 The present application provides a power supply system, which comprises a first power supply board 10 and a second power supply board 20. The first power supply board 10 is used as a main power supply board, and the second power supply board 20 is used as an auxiliary power supply board. The number of the second power supply board 20 can be one or more. The first power supply board 10 is connected to a power supply, and the second power supply board 20 is connected to the first power supply board 10. The first power supply board 10 transmits electric energy to the second power supply board 20.

[0033] Please refer to Figure 2 In the embodiment of the present application, the first power supply board 10 is provided with a power supply control circuit, and the second power supply board 20 is provided with a power module. The power module supplies power to other devices in the power supply board according to the input electric energy. The power supply control circuit in the first power supply board 10 is connected to the power module in the second power supply board 20. It should be noted that other power modules can also be provided in the first power supply board 10 to supply power to other devices in the first power supply board 10. In order to highlight the power supply relationship between the first power supply board 10 and the second power supply board 20, the working process of the power supply control circuit is described by taking the association between the power module and the power supply control circuit provided in the second power supply board as an example.

[0034] The power supply control circuit comprises a power input module 11, a power control module 12 and a switching module 13 connected in sequence. When the power input module is connected to the power supply, the power energy input by the power input module 11 is transmitted to one or more power modules by the switching module 13; and the power control module 12 controls the on-off of the power transmission path between the power input module 11 and the switching module 13 according to the external control signal. In this embodiment, the power input module 11 is used to connect to the power supply, the switching module 13 is used to connect to one or more power modules, so as to transmit the power energy input by the power input module 11 to the power modules in the second power board 20; and the power control module 12 is used to control the on-off of the power transmission path between the power input module 11 and the switching module 13 according to the external control signal.

[0035] When the power supply system is applied to a display device, the display device enters a working state, at this time, the control signal (such as BL_ON signal) output by the master module (such as the core board of the display device) in the display device is used as the external control signal of the power control module 12, and the power control module 12 controls the conduction of the power transmission path between the power input module 11 and the switching module 13 according to the external control signal, at this time, the power module can obtain power energy through the switching module 13 in the first power board 10; if the display device enters a standby state, at this time, the control signal output by the master module in the display device is used as the external control signal of the power control circuit, and the power control module 12 controls the disconnection of the power transmission path between the power input module 11 and the switching module 13 according to the external control signal, which is equivalent to directly disconnecting the second power board 20, thereby reducing the power consumption of the circuits or other devices in the second power board 20, so as to reduce the standby power consumption of the overall display device.

[0036] In this embodiment, the power control circuit is arranged in the main power board to connect other auxiliary power boards, the power control circuit can directly control the power transmission path between the power supply and the auxiliary power board, which is beneficial to directly disconnect the power supply of the auxiliary power board in the standby state, so as to directly disconnect the power supply of the auxiliary power board, thereby reducing the standby power consumption.

[0037] Please refer to Figure 3 In some embodiments, the power control module 12 comprises a switching unit 121 and a switching control unit 122, the switching unit 121 is connected with the switching control unit 122, and the switching unit 121 is connected with the power input module 11 and the switching module 13 respectively. In this embodiment, a switching unit 121 is arranged between the switching module 13 and the power input module, and the switching control unit 122 controls the on-off of the switching unit 121 according to the control signal, thereby controlling the on-off of the power transmission path.

[0038] When the external control signal is a first level signal, the switch control unit 122 controls the switch unit 121 to turn on the power transmission path between the power input module 11 and the adapter module 13 according to the first level signal; when the external control signal is a second level signal, the switch control unit 122 controls the switch unit 121 to turn off the power transmission path between the power input module 11 and the adapter module 13 according to the second level signal. In the embodiment, the switch control unit 122 is configured to control the switch unit 121 to turn on the power transmission path between the power input module 11 and the adapter module 13 when the control signal is the first level signal; and the switch control unit 122 is configured to control the switch unit 121 to turn off the power transmission path between the power input module 11 and the adapter module 13 when the control signal is the second level signal, thereby realizing the on-off control of the input power in the auxiliary power panel.

[0039] Referring to Figure 4 In some embodiments, the power control circuit further comprises a protection unit 123 and a protection control unit 124, the protection control unit 124 is connected with the protection unit 123 and the switch control unit 122, and the protection unit 123 is connected with the adapter module 13 and the power input module 11 respectively; the protection control unit 124 controls the protection unit 123 to enter a protection state according to the first level signal, and controls the protection unit 123 to exit the protection state after a preset time and controls the switch control unit 122 to turn on the power transmission path. In the embodiment, the protection control unit 124 is configured to control the protection unit 123 to enter the protection state when the control signal is the first level signal, and control the switch control unit 122 to turn on the power transmission path between the power input module 11 and the adapter module 13 after a preset time, and at the same time, control the switch unit 121 to exit the protection state. In the protection state, the protection unit 123 is configured to suppress electromagnetic interference. When the control signal is the second level signal, the protection control unit 124 controls the protection unit 123 to be in a non-protection state and controls the switch control unit 122 to turn off the power transmission path between the power input module 11 and the adapter module 13.

[0040] Referring to Figure 5 Since the main power panel and the auxiliary power panel are connected by a power line (for example, the power is an alternating current power, and the corresponding power line is an AC power line), the power line needs to cross the physical area of different boards, and its path inevitably passes through the hot ground (primary side ground), the cold ground (secondary side ground), and the high-frequency and low-frequency signal area formed by the main power panel and the auxiliary power panel. The long-distance wiring of such a high-voltage flying line forms an inefficient but effective antenna structure, which is prone to cause serious electromagnetic interference and affect the signal quality and stability of the whole machine.

[0041] The power control module 12 in the embodiment is provided with the protection unit 123 and the protection control unit 124. When the control signal is the first level signal, the protection control unit 124 first controls the protection unit 123 to enter the protection state to suppress the electromagnetic interference. Then, after the protection unit 123 enters the protection state for a preset time, the switch control unit 122 is controlled to make the switch unit 121 conduct the power transmission path. The power supply state is thus relieved from the electromagnetic interference problem, and the reliability of the power supply system is improved. When the switch control unit 122 is controlled to make the power transmission path conduct, the protection unit 123 is also directly short-circuited. Thus, the function of the protection unit 123 automatically exiting the protection state is realized, and the reliability of the circuit control circuit is improved. The switch control unit 122 and the protection control unit 124 in the power control circuit can be arranged on the secondary side of the first power board 10, and the adapter module 13 and the power input module 11 can be arranged on the primary side of the first power board 10.

[0042] Please refer to Figure 6 In some embodiments, the protection control unit 124 includes a control subunit 1241 and a delay subunit 1242. The control subunit 1241 and the delay subunit 1242 are connected. The delay subunit 1242 is connected with the switch control unit 122. The control subunit 1241 controls the protection unit to enter the protection state according to the first level signal, and controls the delay subunit to delay for a preset time, and then makes the switch control unit control the power transmission path to conduct. The control subunit 1241 in the embodiment is used to control the protection unit 123 to enter the protection state when the control signal is the first level signal, and controls the delay subunit 1242 to delay for a preset time, and then makes the switch control unit 122 control the power transmission path to conduct to enter the power supply state. At the same time, the protection unit 123 is also short-circuited, which is equivalent to the protection unit 123 automatically exiting the protection state. Thus, the orderly switching of the protection state and the power supply state of the power control circuit is ensured.

[0043] In some embodiments, the protection unit 123 includes a protection subunit 1231 and a switch subunit 1232, which are connected together. The switch subunit 1232 is also connected to the protection control unit 124. The protection control unit 124, based on a first level signal, controls the switch subunit 1232 to connect the protection subunit 1231 between the adapter module 13 and the power input module 11, thereby suppressing electromagnetic interference. In this embodiment, the switch subunit 1232 is controlled by the protection control unit 124 when it receives the first level signal to connect the protection subunit 1231 between the adapter module 13 and the power input module 11, which is equivalent to connecting it in series between the adapter module 13 and the power input module 11, thereby suppressing electromagnetic interference and improving the reliability of the power input. In this embodiment, a switch subunit 1232 is provided. The control subunit 1241 controls the state of the switch subunit 1232 according to the external control signal, thereby enabling the protection subunit 1231 connected in series with the switch subunit 1232 to be connected to or disconnected from the power control circuit, thereby realizing flexible control of the protection subunit 1231.

[0044] Please see Figure 7 In one embodiment, the control subunit 1241 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a first switch Q1. One end of the first resistor R1 is used to receive the control signal, and the other end of the first resistor R1 is connected to the first end of the first switch Q1. The second end of the first switch Q1 is grounded, and the third end of the first switch Q1 is connected to the delay subunit 1242, the protection unit 123, and the switching unit 121. One end of the second resistor R2 and one end of the first capacitor C1 are both connected to the first end of the first switch Q1, and the other ends of the second resistor R2 and the first capacitor C1 are both grounded. In this embodiment, the control signal is a BL_ON signal, which is output by the chassis in the display device. The first switch Q1 is a transistor, with its first end being the base, its second end being the emitter, and its third end being the collector.

[0045] In one embodiment, the delay subunit 1242 includes a second capacitor C2, a third capacitor C3, a third resistor R3, a fourth resistor R4, and a Zener diode ZD1. One end of the second capacitor C2, one end of the third capacitor C3, and one end of the fourth resistor R4 are all energized. The other ends of the second capacitor C2, the other ends of the third capacitor C3, and the positive terminal of the Zener diode ZD1 are all connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the third terminal of the first switching transistor Q1. The negative terminal of the Zener diode ZD1 and the other end of the fourth resistor R4 are both connected to the switch control unit 122. In this embodiment, a delay circuit is formed using simple circuit components, such as the second capacitor C2, the third capacitor C3, and the Zener diode ZD1, to achieve the delay function. While simplifying the circuit structure, it can ensure the orderly operation of the protection state and power supply state of the power control circuit.

[0046] In one embodiment, the switch subunit 1232 includes a first switch device JD1. Pins 7 and 8 of the first switch device JD1 are connected to the protection control unit 124, pins 5 and 6 of the first switch device JD1 are energized, pins 1 and 2 of the first switch device JD1 are connected to the adapter module 13, and pins 3 and 4 of the first switch device JD1 are connected to the protection subunit 1231. In this embodiment, the first switch device JD1 is disposed in the first power board 10, which can form isolation between the primary side and the secondary side, which is beneficial to improving the reliability of the overall circuit structure.

[0047] As one embodiment, the protection subunit 1231 includes a first thermistor RN1 and a second thermistor RN2. One end of the first thermistor RN1 is connected to the power input module 11, and the other end of the first thermistor RN1 is connected to one end of the second thermistor RN2. The other end of the second thermistor RN2 is connected to the third and fourth pins of the first switching device.

[0048] When the BL_ON signal is at a high level, the first switch Q1 is turned on. The third capacitor C3 and the second capacitor C2 form a path to ground through the third resistor R3 and the first switch Q1. The second capacitor C2 and the third capacitor C3 enter a charging state. After charging for a certain period, such as 20 seconds, and reaching the turn-on voltage of the Zener diode ZD1, the switch control unit 122 enters a working state, controlling the switch unit 121 to turn on and enter the power supply state. Before this, because the first switch Q1 is turned on, the first switching device JD1 is grounded, forming a circuit path. The turn-on of the first switching device JD1 then connects the first thermistor RN1 and the second thermistor RN2 to the circuit. At this time, the first thermistor RN1 and the second thermistor RN2 limit the surge current to mitigate electromagnetic interference and reduce the impact of sudden current changes on the circuit.

[0049] In one embodiment, the switching unit 121 includes a second switching device JD2. Pins 5 and 6 of the second switching device JD2 are connected to the switching control unit 122, pins 7 and 8 of the second switching device JD2 are grounded, pins 1 and 2 of the second switching device JD2 are connected to the adapter module 13, and pins 3 and 4 of the second switching device JD2 are connected to the power input module 11. Similarly, in this embodiment, the second switching device JD2 can achieve isolation between the primary and secondary sides of the first power board 10.

[0050] In one embodiment, the switch control unit 122 includes a second switch transistor Q2. The first terminal of the second switch transistor Q2 is used to receive a control signal, the second terminal of the second switch transistor Q2 is energized, and the third terminal of the second switch transistor Q2 is connected to pins 5 and 6 of the second switching device JD2. In this embodiment, the second switch transistor Q2 is a transistor, with its first terminal being the base, its second terminal being the emitter, and its third terminal being the collector.

[0051] When the BL_ON signal is a high-level signal, the first switch Q1 is turned on. Because the first switch Q1 is turned on, it grounds the first switching device JD1, forming a circuit path. This connects the first thermistor RN1 and the second thermistor RN2 to the circuit. At this time, the first and second thermistors RN1 and RN2 limit the surge current, mitigating electromagnetic interference and reducing the impact of sudden current changes on the circuit. The third capacitor C3 and the second capacitor C2 form a path to ground through the third resistor R3 and the first switch Q1. The second capacitor C2 and the third capacitor C3 enter a charging state. After charging for a certain period, such as 20 seconds, and reaching the turn-on voltage of the Zener diode ZD1, the second switch Q2 is turned on, connecting the second switching device JD2. At this time, a path is formed between the adapter module 13 and the power output module. Simultaneously, the first and second thermistors RN1 and RN2 are short-circuited, the protection unit 123 exits the protection state, and the circuit enters the power supply state.

[0052] When the BL_ON signal is a second level signal, such as a low level signal, both the first switch Q1 and the second switch Q2 are turned off, and the corresponding first switch JD1 and the second switch JD2 are also turned off. At this time, the path between the adapter module 13 and the power input module 11 is broken, the adapter module 13 cannot output power, and the auxiliary power board is in a power-off state.

[0053] In one embodiment, the power input module 11 includes a first connection interface CN1. Pins 1 and 2 of the first connection interface CN1 are used to connect to the live wire of the power supply, and pins 3 and 4 of the first connection interface CN1 are used to connect to the neutral wire of the power supply. The adapter module 13 includes a second connection interface CN2. Pins 1 and 2 of the second connection interface CN2 are connected to the power input module 11, and pins 3 and 4 of the second connection interface CN2 are both connected to the switching unit 121. In this embodiment, when the second switching device JD2 is turned on, it is equivalent to connecting the neutral wire connection pins (pins 3 and 4) of the second connection interface CN2 with the neutral wire connection pins (pins 3 and 4) of the first connection interface CN1, so that the second connection interface CN2 is connected to the neutral and live wires of the power supply through the first connection interface CN1. When the second switching device JD2 is disconnected, the neutral connection pins (pins 3 and 4) of the second connection interface CN2 are disconnected from the neutral connection pins (pins 3 and 4) of the first connection interface CN1. At this time, the second connection interface CN2 is disconnected from the power supply, and the auxiliary power board is powered off.

[0054] In this embodiment, a power control circuit is formed using conventional electronic components such as switches, resistors, and capacitors, resulting in a simple overall circuit structure. When the power supply system equipped with this power control circuit is applied to a display device, a low-level signal is output from the display device's chassis side to the first switch Q1, controlling both the first switch JD1 and the second switch JD2 to disconnect. This ensures that the auxiliary power board is disconnected during standby, reducing the overall standby power consumption of the device. Conversely, when the display device is in operation, a high-level signal is output from the display device's chassis side to the first switch Q1, controlling the first switch JD1 and the second switch JD2 to conduct sequentially. This allows the power supply system to enter protection mode and power supply mode in sequence, automatically exiting protection mode upon entering power supply mode. This ensures that protection and power supply modes proceed in an orderly manner, improving the flexibility and reliability of the power supply system.

[0055] This application also provides a power control circuit, which establishes a power control module between the power input module and the adapter module. This power control module controls the connection and disconnection of the power transmission path between the power input module and the adapter module. When this power control circuit is applied to a multi-power module supply system, the adapter module connects to the power modules, effectively transferring the power input from the power input module to each power module. When necessary, the power control module can disconnect the power transmission path between the power input module and the adapter module, essentially disconnecting the power input to the power modules directly. Since the power control circuit has been described in detail above, it will not be repeated here.

[0056] This application also provides a display device including the aforementioned power supply system. When the display device enters standby mode, a low-level signal can be output from the device's chassis side to the first switching transistor, controlling both the first and second switching devices to disconnect. This disconnects the auxiliary power supply in the power supply system, reducing the overall standby power consumption of the device. When the display device is in operation, a high-level signal can be output from the device's chassis side to the first switching transistor, controlling the first and second switching devices to conduct sequentially. This allows the power supply system to enter protection mode and power supply mode sequentially, and exits protection mode upon entering power supply mode. This orderly transition between protection and power supply modes improves the flexibility and reliability of the power supply system. Since the power supply system has been described in detail above, it will not be repeated here.

[0057] The power control circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply control circuit, characterized in that, The power control circuit is applied to a power supply system, which includes one or more power modules. The power control circuit includes a power input module, a power control module, and a converter module connected in sequence. When the power input module is connected to a power source, the adapter module transmits the electrical energy input by the power input module to one or more of the power modules. The power control module controls the connection and disconnection of the power transmission path between the power input module and the adapter module according to the external control signal.

2. The power control circuit according to claim 1, characterized in that, The power control module includes a switching unit and a switching control unit. The switching unit is connected to the switching control unit and is also connected to the power input module and the adapter module. When the external control signal is a first level signal, the switch control unit controls the switch unit to conduct the power transmission path between the power input module and the adapter module according to the first level signal. When the external control signal is a second-level signal, the switch control unit controls the switch unit to disconnect the power transmission path between the power input module and the adapter module according to the second-level signal.

3. The power control circuit according to claim 2, characterized in that, The power control circuit further includes a protection unit and a protection control unit. The protection control unit is connected to the protection unit and the switch control unit. The protection unit is connected to the adapter module and the power input module, respectively. The protection control unit controls the protection unit to enter the protection state according to the first level signal, and after a preset time, controls the protection unit to exit the protection state and causes the switch control unit to control the conduction of the power transmission path.

4. The power control circuit according to claim 3, characterized in that, The protection control unit includes a control subunit and a delay subunit, the control subunit and the delay subunit are connected, and the delay subunit is connected to the switch control unit; The control subunit controls the protection unit to enter the protection state according to the first level signal, and controls the delay subunit to delay the preset time, so that the switch control unit controls the conduction of the power transmission path.

5. The power control circuit according to claim 3, characterized in that, The protection unit includes a protection subunit and a switch subunit, the protection subunit and the switch subunit are connected, and the switch subunit is also connected to the protection control unit; The protection control unit controls the switching subunit to connect the protection subunit between the adapter module and the power input module according to the first level signal, so that the protection subunit can suppress electromagnetic interference.

6. The power control circuit according to claim 4, characterized in that, The control subunit includes a first resistor, a second resistor, a first capacitor, and a first switching transistor. One end of the first resistor is used to receive the control signal, and the other end of the first resistor is connected to the first end of the first switching transistor. The second end of the first switching transistor is grounded, and the third end of the first switching transistor is connected to the delay subunit, the protection unit, and the switching unit. One end of the second resistor and one end of the first capacitor are both connected to the first end of the first switching transistor, and the other end of the second resistor and the other end of the first capacitor are both grounded.

7. The power control circuit according to claim 6, characterized in that, The delay subunit includes a second capacitor, a third capacitor, a third resistor, a fourth resistor, and a Zener diode. One end of the second capacitor, one end of the third capacitor, and one end of the fourth resistor are all energized. The other end of the second capacitor, the other end of the third capacitor, and the positive terminal of the Zener diode are all connected to one end of the third resistor. The other end of the third resistor is connected to the third terminal of the first switching transistor. The negative terminal of the Zener diode and the other end of the fourth resistor are both connected to the switch control unit.

8. The power control circuit according to claim 5, characterized in that, The switch subunit includes a first switch device, pins 7 and 8 of which are connected to the protection control unit, pins 5 and 6 of which are energized, pins 1 and 2 of which are connected to the adapter module, and pins 3 and 4 of which are connected to the protection subunit.

9. The power control circuit according to claim 5, characterized in that, The protection subunit includes a first thermistor and a second thermistor. One end of the first thermistor is connected to the power input module, and the other end of the first thermistor is connected to one end of the second thermistor. The other end of the second thermistor is connected to the switch subunit.

10. The power control circuit according to any one of claims 2-9, characterized in that, The switching unit includes a second switching device, pins 5 and 6 of which are connected to the switch control unit, pins 7 and 8 of which are grounded, pins 1 and 2 of which are connected to the adapter module, and pins 3 and 4 of which are connected to the power input module.

11. The power control circuit according to claim 10, characterized in that, The switch control unit includes a second switch transistor. The first end of the second switch transistor is used to receive the control signal, the second end of the second switch transistor is energized, and the third end of the second switch transistor is connected to the 5th and 6th pins of the second switch device.

12. The power control circuit according to claim 10, characterized in that, The power input module includes a first connection interface, wherein pins 1 and 2 of the first connection interface are used to connect to the live wire of the power supply, and pins 3 and 4 of the first connection interface are used to connect to the neutral wire of the power supply.

13. The power control circuit according to claim 10, characterized in that, The adapter module includes a second connection interface, pins 1 and 2 of which are connected to the power input module, and pins 3 and 4 of which are both connected to the switching unit.

14. A power supply system, characterized in that, The power supply system includes: A first power board, wherein the first power board is provided with a power control circuit as described in any one of claims 1-13; One or more second power boards, on which the power module is disposed, and the power module is connected to the power control circuit.

15. A display device, characterized in that, The display device includes the power supply system as described in claim 14.

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