Display screen power supply control device and system

Abstract

The utility model discloses a display screen power supply control device and system. The display screen power supply control device comprises a triode and a power supply control circuit, the triode is connected with the power supply control circuit in parallel, the triode is provided with a base electrode pin, a collector electrode pin and an emitting electrode pin, the base electrode pin is used for being connected with a preset receiving card in series, and the collector electrode pin is used for being connected with the output end of a signal output module. The emitting electrode pin is grounded, the power supply control circuit is provided with a field effect transistor, the field effect transistor is provided with a source electrode pin, a drain electrode pin and a grid electrode pin, the source electrode pin is used for being connected with a power supply interface of the display screen in series, the drain electrode pin is used for being connected with a first power supply in series, and the grid electrode pin is used for being connected with the output end of the signal output module. According to the utility model, the technical problem of high equipment cost when a device with a level conversion circuit is used for controlling the power switch of the display screen in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of computers, and more specifically, to a power control device and system for a display screen. Background Technology

[0002] Precise control of the display screen's on / off state is crucial for balancing the energy efficiency and hardware lifespan of display devices. Currently, the main approach involves a level conversion circuit between the signal receiver card and the MOSFET (Field-Effect Transistor). This circuit converts the low-level control signal from the receiver card to control the boost MOSFET, thereby controlling the display screen's power on / off state. However, this method requires an additional level conversion circuit within the power control module, resulting in high equipment costs.

[0003] There is currently no effective solution to the above problems. Utility Model Content

[0004] This utility model provides a power control device and system for a display screen, which at least solves the technical problem of high equipment cost when using a device with a level conversion circuit to control the power switch of a display screen in related technologies.

[0005] According to one aspect of the present invention, a power control device and system for a display screen is provided, comprising: a transistor and a power control circuit, wherein the transistor and the power control circuit are connected in parallel, the transistor having a base pin, a collector pin, and an emitter pin, the base pin being connected in series with a predetermined receiving card to control the conduction state of the transistor according to the received level signal of the predetermined receiving card, the collector pin being connected to the output terminal of a signal output module, and the emitter pin being grounded; the power control circuit having a field-effect transistor having a source pin, a drain pin, and a gate pin, the source pin being connected in series with the power interface of the display screen, the drain pin being connected in series with a first power supply, and the gate pin being connected to the output terminal of the signal output module.

[0006] Optionally, the display power control device further includes: a signal output module, wherein the input terminal of the signal output module is used to connect to a second power supply, the collector pin of the transistor and the gate pin of the field-effect transistor are connected in parallel and then connected in series with the output terminal of the signal output module, the signal output module is used to convert the first voltage provided by the second power supply into a second voltage and apply it to a predetermined component, the predetermined component including one of the following: a transistor, the power control circuit, wherein when the second voltage is applied to the field-effect transistor, the second voltage is used to adjust the gate voltage of the field-effect transistor to control the conduction state of the field-effect transistor.

[0007] Optionally, the signal output module further includes: the signal output module includes an inductor, a conversion chip, and a diode, wherein the input terminal of the inductor, the input pin of the conversion chip, and the enable pin of the conversion chip are respectively connected to the second power supply; the switch pin of the conversion chip and the positive terminal of the diode are respectively connected to the output terminal of the inductor; the negative feedback pin of the conversion chip, the collector pin of the transistor, and the gate pin of the field-effect transistor are respectively connected to the negative terminal of the diode.

[0008] Optionally, the signal output module further includes a capacitor, wherein the input terminal of the capacitor is connected to the negative terminal of the diode, and the collector pin of the transistor and the gate pin of the field-effect transistor are connected in parallel and then connected in series with the output terminal of the capacitor, so that the fluctuation value of the second voltage output by the signal output module is less than a predetermined threshold.

[0009] Optionally, the display power control device further includes: a predetermined receiving card, wherein the predetermined receiving card is connected in series with the base pin of the transistor to send the level signal to control the conduction state of the transistor.

[0010] Optionally, the display power control device further includes: a first power supply, wherein the first power supply is connected in series with the drain pin of the field-effect transistor to supply power to the display screen.

[0011] Optionally, the power control device for the display screen further includes an overload protection device, wherein the input terminal of the overload protection device is connected to the source pin of the field-effect transistor, and the output terminal of the overload protection device is used to connect to the power interface of the display screen.

[0012] Optionally, the display power control device further includes a security chip, wherein the output terminal of the security chip is connected to the base pin of the transistor, and the input terminal of the security chip is used to connect to the predetermined receiving card.

[0013] Optionally, the display power control device further includes a feedback adjustment module, wherein the input terminal of the feedback adjustment module is used to connect to the signal interface of the display screen, and the output terminal of the feedback adjustment module is used to connect to the first power supply, so as to adjust the output voltage of the first power supply according to the feedback signal received by the input terminal of the feedback adjustment module.

[0014] According to one aspect of the present invention, a display screen power control system is provided, comprising: a display screen power control device, a first power supply, a predetermined receiving card, and a display screen, wherein the display screen power control device is connected in series with the predetermined receiving card through the base pin of the transistor, the display screen power control device is connected in series with the first power supply through the drain pin of the field-effect transistor, and the display screen power control device is connected in series with the power interface of the display screen through the source pin of the field-effect transistor.

[0015] In this embodiment of the invention, a transistor and a power control circuit are used. The transistor and the power control circuit are connected in parallel. The transistor has a base pin, a collector pin, and an emitter pin. The base pin is connected in series with a predetermined receiving card to control the conduction state of the transistor based on the received level signal from the predetermined receiving card. The collector pin is connected to the output terminal of the signal output module, and the emitter pin is grounded. The power control circuit includes a field-effect transistor (FET), which has a source pin, a drain pin, and a gate pin. The source pin is connected in series with the power interface of the display screen, the drain pin is connected in series with a first power supply, and the gate pin is connected to the output terminal of the signal output module. By connecting the transistor and the power control circuit in parallel, the conduction state of the transistor is controlled by the level signal from the predetermined receiving card received through the base pin of the transistor, thereby controlling the conduction state of the FET in the power control circuit. This achieves the technical effect of controlling the power switch state of the display screen, thus solving the technical problem of high equipment cost when using devices with level conversion circuits to control the power switch of the display screen in related technologies. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the display screen power control device according to an embodiment of the present utility model;

[0018] Figure 2 This is a circuit diagram of energy-saving control of the display screen provided by an optional embodiment of this utility model;

[0019] Figure 3 This is a circuit diagram of the boost circuit provided in an optional embodiment of this utility model;

[0020] Figure 4 This is a circuit diagram of the power switch control circuit provided in an optional embodiment of this utility model;

[0021] Figure 5 This is a system block diagram of the display power control system provided in an embodiment of the present utility model.

[0022] The above figures include the following reference numerals:

[0023] 10. Transistor; 20. Power supply control circuit; 30. Field-effect transistor. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0026] Example 1

[0027] According to an embodiment of the present invention, a power control device for a display screen is provided. Figure 1 This is a schematic diagram of the display screen power control device according to an embodiment of the present invention, as shown below. Figure 1 As shown, the device includes: a transistor 10 and a power control circuit 20. The transistor 10 and the power control circuit 20 are connected in parallel. The transistor 10 has a base pin, a collector pin, and an emitter pin. The base pin is connected in series with a predetermined receiving card to control the conduction state of the transistor 10 according to the received level signal of the predetermined receiving card. The collector pin is connected to the output terminal of the signal output module, and the emitter pin is grounded. The power control circuit 20 has a field-effect transistor 30. The field-effect transistor 30 has a source pin, a drain pin, and a gate pin. The source pin is connected in series with the power interface of the display screen, the drain pin is connected in series with a first power supply, and the gate pin is connected to the output terminal of the signal output module.

[0028] In this embodiment, transistor 10 is connected in parallel with power control circuit 20. The collector pin of transistor 10 and field-effect transistor 30 in power control circuit 20 are respectively connected to the output terminal of signal output module. When the base pin of transistor 10 receives a level signal from predetermined receiving card requesting the display screen to be powered on, transistor 10 is in the conducting state. The collector pin and emitter pin of transistor 10 form a path. The current from the output terminal of signal output module will flow to the circuit branch where transistor 10 is located. The gate pin of field-effect transistor 30 is at a low level, field-effect transistor 30 is turned on, and current flows from the drain pin of field-effect transistor 30 to the source pin to power the display screen. Similarly, when the base pin of transistor 10 receives a level signal from the predetermined receiving card requesting the power of the display screen to be turned off, transistor 10 is in the off state. The current from the output terminal of the signal output module will flow to the circuit branch where the field-effect transistor 30 is located. The gate pin of the field-effect transistor 30 is at a high level, the field-effect transistor 30 is cut off, and the current cannot flow from the drain pin of the field-effect transistor 30 to the source pin, thus turning off the power of the display screen.

[0029] In the power control device for the display screen provided in this embodiment of the utility model, a transistor 10 and a power control circuit 20 are used. The transistor 10 and the power control circuit 20 are connected in parallel. The transistor 10 is provided with a base pin, a collector pin, and an emitter pin. The base pin is used to connect in series with a predetermined receiving card to control the conduction state of the transistor 10 according to the received level signal of the predetermined receiving card. The collector pin is used to connect to the output terminal of the signal output module, and the emitter pin is grounded. The power control circuit 20 is provided with a field-effect transistor 30. The field-effect transistor 30 is provided with a source pin, a drain pin, and a gate pin. The source pin is used to connect in series with the power interface of the display screen, the drain pin is used to connect in series with the first power supply, and the gate pin is used to connect to the output terminal of the signal output module. By connecting transistor 10 in parallel with power control circuit 20, the conduction state of transistor 10 is controlled by the level signal of the predetermined receiving card received through the base pin of transistor 10, thereby controlling the conduction state of field-effect transistor 30 in power control circuit 20. This achieves the technical effect of controlling the power switch state of the display screen, and solves the technical problem of high equipment cost when using a device with a level conversion circuit to control the power switch of the display screen in related technologies.

[0030] As an optional embodiment, the display power control device further includes: a signal output module, wherein the input terminal of the signal output module is used to connect to a second power supply, and the collector pin of the transistor 10 and the gate pin of the field-effect transistor 30 are connected in parallel and then connected in series with the output terminal of the signal output module. The signal output module is used to convert the first voltage provided by the second power supply into a second voltage and apply it to a predetermined component. The predetermined component includes one of the following: transistor 10, power control circuit 20. When the second voltage is applied to the field-effect transistor 30, the second voltage is used to adjust the gate voltage of the field-effect transistor 30 to control the conduction state of the field-effect transistor 30.

[0031] In this embodiment, the display power control device includes a signal output module that can be connected to a second power source. This module converts the received first voltage from the second power source into a voltage level capable of driving the field-effect transistor 30, resulting in a second voltage for interaction with predetermined components. When the second voltage is applied to the gate of the field-effect transistor 30, the gate voltage can be adjusted, thereby controlling the on or off state of the field-effect transistor and enabling the power supply to the non-working area circuit of the LED display to be cut off or restored.

[0032] As an optional embodiment, the signal output module further includes: the signal output module includes an inductor, a conversion chip, and a diode, wherein the input terminal of the inductor, the input pin of the conversion chip, and the enable pin of the conversion chip are respectively connected to a second power supply, the switch pin of the conversion chip and the positive terminal of the diode are respectively connected to the output terminal of the inductor, the negative feedback pin of the conversion chip, the collector pin of the transistor 10, and the gate pin of the field-effect transistor 30 are respectively connected to the negative terminal of the diode.

[0033] In this embodiment, the signal output module includes an inductor, a conversion chip, and a diode. The conversion chip is an integrated circuit device that can convert the input voltage into the desired output voltage. The enable circuit section of the conversion chip (including the input pin and the enable pin) is connected in parallel with the inductor and then connected in series with the second power supply. The switching circuit section of the conversion chip (the switching pin and the negative feedback pin) is connected in parallel with the diode. By controlling the switching on and off of the conversion chip, the voltage conversion of the signal output module can be realized. At the same time, using the conversion chip can reduce leakage current, reduce weak current and energy consumption when turned off, optimize the no-load power consumption of the signal output module, and improve the energy efficiency of the device.

[0034] As an optional embodiment, the signal output module further includes a capacitor, wherein the input terminal of the capacitor is connected to the negative terminal of the diode, and the collector pin of the transistor 10 and the gate pin of the field-effect transistor 30 are connected in parallel and then connected in series with the output terminal of the capacitor, so that the fluctuation value of the second voltage output by the signal output module is less than a predetermined threshold.

[0035] In this embodiment, the signal output module also includes a capacitor placed at its output terminal. This capacitor filters and smooths the second voltage obtained after conversion by the signal output module, effectively reducing output voltage fluctuations and ensuring that the second voltage output by the signal output module remains within a predetermined threshold range, thus improving circuit stability. Simultaneously, the capacitor's filtering effect prevents voltage surges from damaging subsequent circuits and protects sensitive components from power supply noise.

[0036] As an optional embodiment, the display power control device further includes: a predetermined receiving card, wherein the predetermined receiving card is connected in series with the base pin of the transistor 10 to send a level signal to control the conduction state of the transistor 10.

[0037] In this embodiment, the display power control device further includes a predetermined receiver card, which is used to receive display signals from a computer or control system and convert them into a signal format suitable for the LED display driving circuit. The predetermined receiver card is connected in series with the base pin of the transistor 10 and can send the converted level signal to the transistor 10, thereby controlling the conduction state of the transistor 10 and thus realizing the control of the display power supply.

[0038] As an optional embodiment, the display power control device further includes: a first power supply, wherein the first power supply is connected in series with the drain pin of the field-effect transistor 30 to supply power to the display screen.

[0039] In this embodiment, the display power control device further includes a first power supply, which refers to the power supply that provides the main operating voltage for the display screen. The first power supply is connected in series with the drain pin of the field-effect transistor 30. When the field-effect transistor 30 is in the on state, the current of the first power supply flows through the drain pin of the field-effect transistor 30 to the source pin, thereby providing power to the display screen.

[0040] As an optional embodiment, the display power control device further includes an overload protection device, wherein the input terminal of the overload protection device is connected to the source pin of the field-effect transistor 30, and the output terminal of the overload protection device is used to connect to the power interface of the display screen.

[0041] In this embodiment, the display power control device also includes an overload protection device, which is used to detect and prevent the current in the circuit from exceeding the safe or normal operating range. The input terminal of the overload protection device is connected to the source pin of the field-effect transistor 30, and can detect the current value in the circuit. The output terminal of the overload protection device can be connected to the power interface of the display screen. When the current value in the circuit exceeds the threshold, the connection with the power interface of the display screen can be cut off, effectively preventing short circuits or equipment damage caused by overload, and improving the operational safety of the entire display screen system.

[0042] As an optional embodiment, the display power control device further includes a security chip, wherein the output terminal of the security chip is connected to the base pin of the transistor 10, and the input terminal of the security chip is used to connect to a predetermined receiving card.

[0043] In this embodiment, the display power control device also includes a security chip, which is a chip responsible for detecting the security of the voltage level signal from the predetermined receiving card. The input terminal of the security chip can be connected to the predetermined receiving card to detect whether the voltage level signal from the predetermined receiving card is secure. The output terminal of the security chip is connected to the base pin of the transistor 10. When there is an abnormal voltage level signal, the security chip activates a protection mechanism to protect the display screen and its internal circuitry from damage, thereby improving the system's security.

[0044] As an optional embodiment, the display power control device further includes: a feedback adjustment module, wherein the input terminal of the feedback adjustment module is used to connect to the signal interface of the display screen, and the output terminal of the feedback adjustment module is used to connect to a first power supply, so as to adjust the output voltage of the first power supply according to the feedback signal received by the input terminal of the feedback adjustment module.

[0045] In this embodiment, the display power control device further includes a feedback adjustment module. This module monitors the display's feedback signals and adjusts the output voltage of the first power supply based on these signals. The input of the feedback adjustment module can be connected to the display's signal interface to receive real-time operating status feedback signals, such as current load current, display brightness requirements, or temperature. The output of the feedback adjustment module can be connected to the first power supply to dynamically adjust its output voltage using the received feedback signals. By monitoring the display's operating status in real time, the feedback adjustment module can dynamically adjust the power output, ensuring a stable voltage supply to the display under different load conditions and preventing display performance from being affected by power fluctuations.

[0046] Based on the above embodiments and optional embodiments, an optional implementation method is provided, which is described in detail below.

[0047] An optional embodiment of this utility model provides an energy-saving design control circuit for an LED display screen, which can dynamically cut off the power supply to the non-working area, significantly reducing standby power consumption and energy consumption in non-working state without affecting the normal display function, while ensuring control accuracy, response speed and system stability.

[0048] The following describes in detail the energy-saving design control circuit for LED displays provided by an optional embodiment of this utility model. Figure 2 This is a circuit diagram of the energy-saving control of the display screen provided by an optional embodiment of this utility model, such as... Figure 2 As shown, the energy-saving design control circuit of the LED display screen includes two parts: a boost circuit (same as the signal output module mentioned above) and a power switch control circuit.

[0049] Figure 3 This is a circuit diagram of the boost circuit provided in an optional embodiment of this utility model, such as... Figure 3 As shown, the boost converter chip (same as the aforementioned conversion chip) is paired with external components (inductors, diodes, capacitors, and resistors) to achieve voltage boosting. CS1 is the input filter capacitor, CS2 is the output filter capacitor, CS3 is the compensation capacitor, and CS4 is the soft-start capacitor, connected to the soft-start pin (SS) of the boost converter chip (U3) to control the current rise rate during startup and prevent surges. RS1 is the pull-up resistor for the enable pin (EN) of the boost converter chip, used to ensure normal operation. RS2, RS4, and RW1 are resistors forming the feedback voltage divider network, connected to the feedback pin (FB) of the boost converter chip. The output voltage is set by adjusting the resistance values. L1 is the energy storage inductor, storing and releasing energy during the switching process of the boost converter chip to achieve voltage conversion. D1 is the freewheeling diode, providing a current loop during the inductor discharge phase, suppressing voltage spikes, and protecting the circuit. The boost converter chip also includes a full-speed mode pin (FS), an input pin (IN), a switch pin (SW), a compensation pin (COMP), and a ground pin (GND).

[0050] The circuit structure and function of the components of the boost circuit are described in detail below.

[0051] The boost circuit is connected to the second power supply. The input voltage of the boost circuit (same as the first voltage, VCC) is 4.3V. The boost circuit includes an energy storage element (inductor, L1, 4.7μH) to store energy during the boost process; a diode (D1) to provide a freewheeling path for the inductor when the internal switching transistor of the boost chip is turned off, maintaining the output voltage; capacitors (CS1, CS2, CS3 and CS4) to filter and smooth the input and output voltages, reducing ripple; and resistors (RS1, RS2, RS4 and RW1) to form a feedback network for setting and adjusting the output voltage. By adjusting the resistor ratio, the feedback voltage is adjusted, thereby controlling the boost chip to output a stable second voltage (12V) to power the subsequent circuits.

[0052] Figure 4 This is a circuit diagram of the power switch control circuit provided in an optional embodiment of this utility model, such as... Figure 4As shown, the power switch control circuit includes field-effect transistors (MOSFETs, MOS1 and MOS2) as electronic switches. When a suitable voltage is applied to the gate (G), the transistor is turned on, allowing current to flow from the drain (D) to the source (S), outputting a stable output voltage (VCC1, VCC2) to achieve power on / off control. A transistor (Q1) acts as a switching element, turning on when the input is high, pulling down the relevant node voltage, thereby controlling the on / off state of the MOSFET. RB5 is an emitter resistor used to stabilize the transistor, acting as a voltage divider. RS5 is a connection for boost converters. In the circuit, the series resistors at the input terminals are as follows: RS7 is the base resistor, used to limit the current flowing into the base of the transistor, protecting the transistor and ensuring its operation within a suitable range; RS6 and RS8 are the gate resistors, limiting the current flowing into the gate of the field-effect transistor, protecting the device and stabilizing the gate voltage; RJ1, RJ2, RJ3, and RJ4 are current-limiting resistors; CE2 and CE3 are electrolytic capacitors, used to filter the output VCC1 and VCC2, eliminating high-frequency noise, stabilizing the output voltage, and meeting instantaneous current requirements; PC1 and PC4 are the primary power supplies.

[0053] In this circuit, the source pin (S) of the MOSFET is connected to the first power supply, and the drain pin (D) outputs the supply voltages (VCC1, VCC2), which power different loads respectively. The gate pin (G) controls the conduction and cutoff of the MOSFET by applying a voltage signal. The base pin of the transistor receives a level signal (POWER_CONTROL1_IN control signal), the emitter pin is grounded, and the collector pin is connected to subsequent circuits. By using external control signals, such as those from a pre-defined receiving card (FPGA), the states of the MOSFET and transistor can be adjusted to control the on / off state of the output power supply, thereby achieving energy saving or circuit protection.

[0054] The following describes in detail the workflow of the LED display energy-saving design control circuit provided by the optional embodiment of this utility model.

[0055] When the pre-defined receiving card outputs a low-level signal, Q1 receives the pre-defined level signal (optionally, it can be a high level) and then conducts. The current from the boost circuit flows from the collector to the emitter of Q1. At this time, the circuit branch containing Q1 short-circuits the circuit branch containing the MOSFET. When the MOSFET gate pin does not receive a high-level signal, it is a low-level signal, so the MOSFET is in the conducting state. The current output from the first power supply can flow from the gate to the source of the MOSFET, thereby powering the display screen.

[0056] When the pre-received card outputs a high-level signal, Q1 receives the high-level signal and enters a cutoff state. At this time, the circuit branch where Q1 is located is in an open circuit state. The current from the boost circuit flows to the circuit branch where the MOS transistor is located. The gate pin of the MOS transistor receives a high-level signal, and the MOS transistor is in a cutoff state. The current output by the first power supply cannot flow through the gate of the MOS transistor to the source of the MOS transistor, and the power supply to the display screen is disconnected.

[0057] It should be noted that the processes for MOS1 and MOS2 are the same, and both can perform the control operations described above for the MOS transistors. Optionally, more MOS transistors can be connected to power more displays.

[0058] The above optional implementation methods can achieve at least the following beneficial effects:

[0059] (1) The boosted MOSFET is directly controlled by the FPGA without the need for an additional level conversion circuit, realizing efficient switching control of the high-voltage load (12V) by the low-voltage controller (3.3V / 5V);

[0060] (2) Combining the dual energy-saving mechanism of boost module enable control and MOSFET on / off, the boost module output and load power supply are cut off simultaneously when the module is turned off, minimizing standby power consumption.

[0061] (3) For the multi-zone independent control architecture of LED display screen, multiple MOS transistors are driven by the FPGA input / output interface (IO port) of the receiving card to realize flexible regional power management, and the minimum precision is reduced to the energy saving of a single module, achieving a technological breakthrough of low power consumption, high reliability and flexible control.

[0062] Example 2

[0063] According to an embodiment of the present invention, a power supply control system for a display screen is also provided. Figure 5 This is a system block diagram of the display power control system provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the device includes any of the above-mentioned display screen power control devices, a first power supply, a predetermined receiving card, and a display screen. The display screen power control device is connected in series with the predetermined receiving card through the base pin of a transistor, the display screen power control device is connected in series with the first power supply through the drain pin of a field-effect transistor, and the display screen power control device is connected in series with the power interface of the display screen through the source pin of a field-effect transistor.

[0064] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0065] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0067] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0069] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0070] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A power control device for a display screen, characterized in that, include: A transistor (10) and a power control circuit (20) are connected in parallel. The transistor (10) is provided with a base pin, a collector pin, and an emitter pin. The base pin is used to connect in series with a predetermined receiving card to control the conduction state of the transistor (10) according to the received level signal from the predetermined receiving card. The collector pin is used to connect to the output terminal of the signal output module, and the emitter pin is grounded. The power control circuit (20) is equipped with a field-effect transistor (30), which has a source pin, a drain pin and a gate pin. The source pin is used to connect in series with the power interface of the display screen, the drain pin is used to connect in series with the first power supply, and the gate pin is used to connect with the output terminal of the signal output module.

2. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: a signal output module, wherein, The input terminal of the signal output module is used to connect to the second power supply. The collector pin of the transistor (10) and the gate pin of the field-effect transistor (30) are connected in parallel and then connected in series with the output terminal of the signal output module. The signal output module is used to convert the first voltage provided by the second power supply into a second voltage and apply it to a predetermined component. The predetermined component includes one of the following: transistor (10), power control circuit (20). When the second voltage is applied to the field-effect transistor (30), the second voltage is used to adjust the gate voltage of the field-effect transistor (30) to control the conduction state of the field-effect transistor (30).

3. The display screen power control device according to claim 2, characterized in that, The signal output module further includes: The signal output module includes an inductor, a conversion chip, and a diode. The input terminal of the inductor, the input pin and the enable pin of the conversion chip are respectively connected to the second power supply. The switch pin of the conversion chip and the positive terminal of the diode are respectively connected to the output terminal of the inductor. The negative feedback pin of the conversion chip, the collector pin of the transistor (10) and the gate pin of the field-effect transistor (30) are respectively connected to the negative terminal of the diode.

4. The display screen power control device according to claim 3, characterized in that, The signal output module further includes: a capacitor, wherein, The input terminal of the capacitor is connected to the negative terminal of the diode. The collector pin of the transistor (10) and the gate pin of the field-effect transistor (30) are connected in parallel and then connected in series with the output terminal of the capacitor, so that the fluctuation value of the second voltage output by the signal output module is less than a predetermined threshold.

5. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: a predetermined receiving card, wherein... The predetermined receiving card is connected in series with the base pin of the transistor (10) to emit the level signal and control the conduction state of the transistor (10).

6. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: a first power supply, wherein... The first power supply is connected in series with the drain pin of the field-effect transistor (30) to power the display screen.

7. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: an overload protection device, wherein... The input terminal of the overload protection device is connected to the source pin of the field-effect transistor (30), and the output terminal of the overload protection device is used to connect to the power interface of the display screen.

8. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: a security chip, wherein... The output terminal of the security chip is connected to the base pin of the transistor (10), and the input terminal of the security chip is used to connect to the predetermined receiving card.

9. The display screen power control device according to claim 1, characterized in that, The power control device for the display screen further includes: a feedback adjustment module, wherein... The input terminal of the feedback adjustment module is used to connect to the signal interface of the display screen, and the output terminal of the feedback adjustment module is used to connect to the first power supply, so as to adjust the output voltage of the first power supply according to the feedback signal received by the input terminal of the feedback adjustment module.

10. A power supply control system for a display screen, characterized in that, Includes the display power control device as described in claim 1, a first power supply, a predetermined receiving card, and a display screen, wherein, The power control device for the display screen is connected in series with the predetermined receiving card through the base pin of the transistor (10), the power control device for the display screen is connected in series with the first power supply through the drain pin of the field-effect transistor (30), and the power control device for the display screen is connected in series with the power interface of the display screen through the source pin of the field-effect transistor (30).

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