Automatic discharge reset circuit and electronic equipment

Abstract

The invention provides an automatic discharge reset circuit and electronic equipment, and can be applied to the technical field of electronic equipment. The automatic discharge reset circuit comprises a power transmission protection unit, a control circuit and a discharge unit, the power transmission protection unit and the discharge unit are connected with a power supply unit, and the control circuit is respectively connected with the power transmission protection unit and the discharge unit; the power transmission protection unit is configured to output a PG enable signal to the control circuit in a normal working state; the control circuit is configured to control the discharge unit to perform pressure relief discharge on the power supply unit when the PG enable signal is not received. According to the application, the discharge unit is controlled to perform pressure relief and discharge on the power supply unit by using the change of the working state of the power transmission protection unit, so that rapid pressure relief and discharge on the power supply unit are realized, and the electronic equipment can be ensured to realize rapid restart in a use scene in which rapid power-on and power-off are required.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to an automatic discharge reset circuit and electronic equipment. Background Art

[0002] In the power management architecture of electronic devices such as servers, capacitors are often installed at the voltage output interface of the power supply unit (PSU) to stabilize the input voltage and avoid input voltage fluctuations. The charge and discharge characteristics of the capacitor are then used to smooth out voltage fluctuations.

[0003] However, the above circuit structure has a characteristic limitation when it comes to power-off restart scenarios. This is because when the power supply unit loses power, the relevant circuit design within the power supply system of the electronic device requires that the input voltage must first discharge to below the undervoltage point before power can be restored to the system.

[0004] However, in scenarios where rapid power cycling is required, the system voltage cannot drop below the undervoltage point in such a short time due to the extremely short interval between power cycling and capacitor discharge. This results in the electronic device's power system being unable to meet the restart requirements, and the system power supply cannot be restarted. Summary of the Invention

[0005] The present application provides an automatic discharge reset circuit and electronic equipment to solve the technical problem that existing electronic equipment cannot quickly restart the system when its power supply system is in a usage scenario where rapid power on and off is required.

[0006] According to a first aspect disclosed in the present application, the present application provides an automatic discharge reset circuit, comprising a power transmission protection unit, a control circuit, and a discharge unit, wherein the power transmission protection unit and the discharge unit are connected to a power supply unit, and the control circuit is connected to the power transmission protection unit and the discharge unit respectively;

[0007] The power transmission protection unit is configured to output a PG enable signal to the control circuit under normal working conditions;

[0008] The control circuit is configured to control the discharge unit to perform pressure relief discharge on the power supply unit when the PG enable signal is not received.

[0009] In a feasible implementation manner, the discharge unit includes a discharge resistor, a first end of the discharge resistor is connected to the voltage output interface of the power supply unit, and the discharge resistor is connected to the control circuit;

[0010] When the control circuit does not receive the PG enable signal, the control circuit controls the second end of the bleeder resistor to be grounded;

[0011] When the control circuit receives the PG enable signal, the control circuit controls the second end of the bleeder resistor to be open.

[0012] In a feasible embodiment, the control circuit includes a field effect transistor and a drive circuit, the drain of the field effect transistor is connected to the second end of the bleeder resistor, the source of the field effect transistor is grounded, and the field effect transistor is connected to the drive circuit;

[0013] When the driving circuit does not receive the PG enable signal, the driving circuit drives the field effect transistor to be turned on, so that the second end of the bleeder resistor is grounded;

[0014] When the driving circuit receives the PG enable signal, the driving circuit drives the field effect transistor to be turned off, so that the second end of the discharge resistor is open.

[0015] In a feasible implementation manner, the field effect transistor is an N-channel enhancement mode MOS transistor.

[0016] In a feasible implementation manner, the driving circuit includes a first resistor, a second resistor and a transistor;

[0017] The first end of the first resistor is connected to the first end of the discharge resistor, and the second end of the first resistor is connected to the gate of the field effect transistor;

[0018] The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the source of the field effect transistor;

[0019] The collector of the transistor is connected to the gate of the field effect transistor, the emitter of the transistor is connected to the source of the field effect transistor, and the base of the transistor is connected to the PG enable signal interface of the power transmission protection unit.

[0020] In a feasible implementation manner, the transistor is configured to be turned off when the PG enable signal is not received, so as to drive the field effect transistor to be turned on;

[0021] The transistor is configured to be turned on when receiving the PG enable signal to drive the field effect transistor to be turned off.

[0022] In a feasible implementation manner, the transistor is an NPN transistor.

[0023] In a feasible implementation manner, the voltage input interface of the power transmission protection unit is connected to the voltage output interface of the power supply unit.

[0024] In a feasible implementation manner, the power transmission protection unit is an E-fuse.

[0025] According to a second aspect disclosed in the present application, the present application provides an electronic device, comprising the automatic discharge reset circuit as described in any one of the first aspects.

[0026] Compared with the existing technology, this application has the following beneficial effects:

[0027] The present application provides an automatic discharge reset circuit and electronic device, which are connected to a power supply unit via a power transmission protection unit. The power supply unit supplies power to the power transmission protection unit. When the input voltage is within the normal range, the power transmission protection unit is activated. After the power transmission protection unit is operating normally, it can output a PG (Power Good) signal to indicate that its working state is normal, and transmit a PG enable signal to the control circuit. Accordingly, when the power supply unit loses power, the power transmission protection unit operates abnormally and can no longer output a PG enable signal to the control circuit. At this time, the control circuit controls the discharge unit to discharge the power supply unit to achieve rapid pressure relief and discharge of the power supply unit, ensuring that the electronic device can be quickly restarted in usage scenarios that require rapid power on and off. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 A schematic structural diagram of an automatic discharge reset circuit provided in an embodiment of the present application;

[0030] Figure 2 A schematic structural diagram of another automatic discharge reset circuit provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the operation flow of an automatic discharge reset circuit provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100-power supply unit;

[0034] 101- voltage output interface;

[0035] 200-transmission protection unit;

[0036] 300-control circuit;

[0037] 400-discharge unit.

[0038] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0040] In the power management architecture of electronic devices such as servers, capacitors are often installed at the voltage output interface of the power supply unit (PSU) to stabilize the input voltage and avoid input voltage fluctuations. This utilizes the capacitor's charge-discharge characteristics to smooth out voltage fluctuations. When the input voltage increases, the capacitor absorbs excess charge and stores energy, thereby suppressing further voltage increases. When the input voltage decreases, the capacitor releases the previously stored charge, replenishing current to maintain voltage stability. This "charge-discharge" characteristic allows the capacitor to smooth voltage fluctuations and provide a stable input voltage.

[0041] However, the above circuit structure has a characteristic limitation when dealing with the scenario of power failure and restart. This is because when the power supply unit loses power, the relevant circuit design inside the power supply system of the electronic device requires that the input voltage must first be discharged to below the undervoltage point before it can be powered on again to restart the system. The undervoltage point is set to ensure that the power supply system can be in a stable and safe initial state when it is powered on again, to avoid system restart failure, system abnormality, or even hardware damage due to factors such as voltage instability and voltage mutation. However, when the electronic device is in a fast power-on and power-off reliability test or a fast restart, etc., which requires fast power on and off, the system voltage cannot drop below the undervoltage point in such a short time due to the extremely short interval between power on and off of the system and insufficient capacitor discharge time.

[0042] This results in the power supply system of the electronic device being unable to meet the conditions for powering on again, and the system power supply cannot be restarted. This also reflects that the power protection mechanism has certain limitations in dealing with usage scenarios that require rapid power on and off, and further optimization of the design is needed to improve the system's adaptability and reliability in complex power supply environments.

[0043] To address the issue of prolonged discharge time after a power outage in a power supply unit (PSU), hindering a quick restart, existing solutions employ two approaches to achieve rapid discharge. One approach involves adding a discharge resistor to the PSU's voltage output interface. When the PSU loses power, the discharge resistor accelerates the drop in Vin voltage, allowing it to drop below the undervoltage point more quickly, thus satisfying the restart requirements for the electronic device and achieving rapid discharge. However, this approach has significant drawbacks. As a fixed component in the circuit, the discharge resistor continues to consume power even when the electronic device is operating normally and the power supply is stable, effectively adding a fixed loss to the circuit. In the long term, this reduces the energy efficiency of the electronic device's power supply, increasing unnecessary energy consumption and operating costs. Another approach involves using software to control the switching of the bleeder resistor. At the moment of a PSU power outage, the software, based on pre-set logic, switches the bleeder resistor on and off for rapid discharge. When the electronic device is powered on again, the software switches the bleeder resistor off, eliminating any additional energy consumption and thus having no impact on energy consumption. However, this solution requires the software-driven circuit and the functional circuit where the bleeder resistor is located to work together. The two must work closely together and respond precisely to ensure that the bleeder resistor is turned on in time to achieve rapid discharge when the PSU loses power, and is accurately disconnected during normal power supply to avoid energy loss. This places high demands on the coordination, stability and reliability of the two functional circuits.

[0044] In response to the above technical problems, the present application proposes an automatic discharge reset circuit and electronic equipment, which controls the discharge unit to discharge the power supply unit by utilizing the working state changes of the transmission protection unit, so as to achieve rapid pressure relief and discharge of the power supply unit, ensuring that the electronic equipment can be quickly restarted in usage scenarios that require rapid power on and off.

[0045] The following describes the technical solutions of the automatic discharge reset circuit and electronic device provided by the present application in detail through specific embodiments. It should be noted that the following embodiments can exist independently or in combination with each other, and the same or similar contents may not be repeated in different embodiments.

[0046] Figure 1 This is a schematic diagram of the structure of an automatic discharge reset circuit provided in an embodiment of the present application, see Figure 1In some embodiments, the automatic discharge reset circuit includes a power transmission protection unit 200, a control circuit 300, and a discharge unit 400. The power transmission protection unit 200 and the discharge unit 400 are connected to the power supply unit 100, and the control circuit 300 is connected to the power transmission protection unit 200 and the discharge unit 400 respectively; the power transmission protection unit 200 is configured to output a PG enable signal to the control circuit 300 under normal working conditions; the control circuit 300 is configured to control the discharge unit 400 to discharge the power supply unit 100 when the PG enable signal is not received.

[0047] In this embodiment, the power transmission protection unit 200 is connected to the power supply unit 100, and the power supply unit 100 supplies power to the power transmission protection unit 200. When the input voltage is within the normal range, the power transmission protection unit 200 is activated. When the power transmission protection unit 200 is operating normally, it can output a PG (Power Good) signal to indicate that it is operating normally, and transmit a PG enable signal to the control circuit 300. Accordingly, when the power supply unit 100 loses power, the power transmission protection unit 200 operates abnormally and can no longer output a PG enable signal to the control circuit 300. At this time, the control circuit 300 controls the discharge unit 400 to discharge the power supply unit 100, thereby achieving rapid pressure relief and discharge of the power supply unit 100, ensuring that the electronic device can be quickly restarted in usage scenarios that require rapid power on and off.

[0048] By utilizing the operating state changes of the power transmission protection unit 200, automatic on / off control of the discharge unit 400 is achieved, enabling the discharge unit 400 only under specific conditions, thereby improving discharge efficiency. Furthermore, the discharge unit 400 is controlled by the existing PG enable signal of the power transmission protection unit 200, which is already present in the electronic device. This eliminates the need for additional controllers and control logic, resulting in a simple structure and convenient control.

[0049] Specifically, in the power management architecture of electronic devices such as servers, the power transmission protection unit 200 is a key component that ensures safe and stable system operation during power failures. It typically has the ability to quickly respond to abnormal conditions such as overcurrent and short circuits and disconnect the circuit. After receiving input voltage, the power transmission protection unit 200 determines whether the input voltage meets its power-on logic. If so, the power transmission protection unit 200 starts up.

[0050] Specifically, the PG signal is a key indicator signal in the power supply system. It is generated when the output voltages of each power supply channel reach stability and meet preset timing requirements. This indicates that the power supply output has stabilized and can meet the power supply needs of subsequent circuits. It is sent to the motherboard or other devices in the form of a high level, notifying them that the power supply is ready and can be safely started. This prevents hardware damage or data loss caused by unstable power supply and ensures that the system operates in a stable and reliable power supply environment. The PG enable signal is a control signal used to enable or disable functions or circuits related to the PG signal. It is enabled when the transmission protection unit is operating normally and disabled when it is operating abnormally.

[0051] See Figure 3 , the operation process of the automatic discharge reset circuit specifically includes the following steps:

[0052] S301 , the power supply unit 100 is powered on and outputs a voltage.

[0053] In step S302, the power transmission protection unit 200 determines whether the input voltage meets the power-on logic. If yes, the process goes to step S303; if not, the process goes to step S307.

[0054] S303, the power transmission protection unit 200 is turned on.

[0055] S304: The power transmission protection unit 200 determines whether its own working state is normal. If so, the process jumps to step S305; if not, the process jumps to step S307.

[0056] S305 , the power transmission protection unit 200 outputs a PG enable signal to the control circuit 300 .

[0057] S306 , the control circuit 300 stops controlling the discharge unit 400 to discharge the power supply unit 100 , and the process ends.

[0058] S307 , the power transmission protection unit 200 stops outputting the PG enable signal to the control circuit 300 .

[0059] S308 , the control circuit 300 controls the discharge unit 400 to discharge the power supply unit 100 , and the process ends.

[0060] Therefore, by utilizing the working state change of the power transmission protection unit, the discharge unit is controlled to discharge the power supply unit 100 to achieve rapid pressure relief and discharge of the power supply unit 100, ensuring that the electronic device can be quickly restarted in usage scenarios that require rapid power on and off.

[0061] See Figure 2 Optionally, the voltage input interface of the power transmission protection unit 200 is connected to the voltage output interface 101 of the power supply unit 100 .

[0062] The power transmission connection between the power transmission protection unit 200 and the power supply unit 100 is achieved by connecting the voltage input interface of the power transmission protection unit 200 to the voltage output interface 101 of the power supply unit 100 .

[0063] Specifically, a capacitor C1 is provided at the voltage output interface 101 of the power supply unit 100 , a first end of the capacitor C1 is connected to a first end of the discharge resistor R4 , and a second end of the capacitor C1 is grounded.

[0064] When the bleeder resistor R4 is working, the capacitor C1 is quickly discharged through the bleeder resistor R4, thereby quickly reducing the system voltage to below the undervoltage point, meeting the voltage requirement for system restart.

[0065] Optionally, the power transmission protection unit 200 is an E-fuse.

[0066] Specifically, E-fuse (electronic fuse) is a current protection device based on semiconductor technology. It monitors the current in real time through a built-in detection circuit. When the current exceeds the preset threshold, its internal switch (such as MOSFET) will quickly disconnect the circuit, thereby preventing overcurrent from damaging the system. Compared with traditional thermal fuses, E-fuse has the advantages of fast response speed, reusability, strong programmability, and no manual replacement is required. It is widely used in electronic equipment that requires precise current control and reliable protection.

[0067] In addition, E-fuse can also be used to build hot-swap solutions to allow module components to be safely inserted or removed without interrupting the power supply of the entire system, playing an important role in the field of power protection.

[0068] See Figure 2 In some embodiments, the discharge unit 400 includes a bleeder resistor R4, a first end of the bleeder resistor R4 is connected to the voltage output interface 101 of the power supply unit 100, and the bleeder resistor R4 is connected to the control circuit 300; when the control circuit 300 does not receive a PG enable signal, the control circuit 300 controls the second end of the bleeder resistor R4 to be grounded; when the control circuit 300 receives a PG enable signal, the control circuit 300 controls the second end of the bleeder resistor R4 to be open.

[0069] Among them, when the power supply unit 100 loses power and the power transmission protection unit 200 stops sending the PG enable signal due to abnormal working status, the control circuit 300 fails to receive the PG enable signal, and the control circuit 300 controls the second end of the discharge resistor R4 to be grounded, thereby using the discharge resistor R4 to quickly discharge the capacitor C1.

[0070] Correspondingly, when the power supply unit 100 is powered on and the power transmission protection unit 200 is in normal working state and continues to send the PG enable signal, the control circuit 300 is able to receive the PG enable signal at this time, and the control circuit 300 controls the second end of the bleeder resistor R4 to be open, and the bleeder resistor R4 in the open state stops working, which neither consumes additional energy nor affects the normal operation of the system power transmission.

[0071] See Figure 2 Optionally, the control circuit 300 includes a field effect transistor M2 and a driving circuit, the drain of the field effect transistor M2 is connected to the second end of the bleeder resistor R4, the source of the field effect transistor M2 is grounded, and the field effect transistor M2 is connected to the driving circuit; when the driving circuit does not receive a PG enable signal, the driving circuit drives the field effect transistor M2 to turn on so that the second end of the bleeder resistor R4 is grounded; when the driving circuit receives a PG enable signal, the driving circuit drives the field effect transistor M2 to turn off so that the second end of the bleeder resistor R4 is open.

[0072] Among them, the field effect transistor M2 is used as a switch to control the grounding or opening of the bleeder resistor R4. When the driving circuit does not receive the PG enable signal, the driving circuit drives the field effect transistor M2 to turn on, so that the second end of the bleeder resistor R4 is grounded, and the bleeder resistor R4 is used to achieve the effect of quickly discharging the capacitor C1.

[0073] Correspondingly, when the driving circuit receives the PG enable signal, the driving circuit drives the field effect transistor M2 to be turned off, so that the second end of the bleeder resistor R4 is in an open circuit state, and the bleeder resistor R4 does not work.

[0074] Specifically, the discharge resistor R4 is a high-power resistor, so that after the power supply unit 100 loses power, a high-power load is added to the input voltage formed by the discharge of the capacitor C1 to achieve rapid discharge.

[0075] Specifically, FET M2 is a voltage-controlled device. Simply applying a suitable gate voltage controls its on and off state. The gate current is extremely low, consuming virtually no drive power, effectively reducing overall circuit power consumption. FET M2's internal carrier mobility is high, allowing it to turn on and off quickly, with switching times typically in the nanosecond range, meeting the demands of high-speed switching circuits.

[0076] Optionally, the field effect transistor M2 is an N-channel enhancement mode MOS transistor.

[0077] The N-channel enhancement-mode MOS transistor (EMS) is an important semiconductor device. It uses an N-type semiconductor as a conductive channel, forming a specific electrical structure between the gate (G), source (S), and drain (D) electrodes. Its operating principle is based on the control of the conductive channel by the gate voltage. When a suitable positive voltage is applied to the gate relative to the source, an N-type inversion layer is induced in the P-type substrate (or well region) beneath the gate, forming a conductive channel. This allows conduction between the source and drain, allowing current to flow. However, when the gate voltage is inappropriate, the conductive channel disappears, and a high-resistance state is formed between the source and drain, virtually preventing current from flowing. N-channel enhancement-mode MOS transistors offer advantages such as high input impedance, fast switching speed, low power consumption, high integration, and low noise.

[0078] See Figure 2 Optionally, the driving circuit includes a first resistor R5, a second resistor R6 and a transistor Q2; the first end of the first resistor R5 is connected to the first end of the discharge resistor R4, and the second end of the first resistor R5 is connected to the gate of the field effect transistor M2; the first end of the second resistor R6 is connected to the second end of the first resistor R5, and the second end of the second resistor R6 is connected to the source of the field effect transistor M2; the collector of the transistor Q2 is connected to the gate of the field effect transistor M2, the emitter of the transistor Q2 is connected to the source of the field effect transistor M2, and the base of the transistor Q2 is connected to the PG enable signal interface of the power transmission protection unit 200.

[0079] Specifically, the transistor Q2 is configured to be turned off when the PG enable signal is not received to control the field effect transistor M2 to be turned on; the transistor Q2 is configured to be turned on when the PG enable signal is received to control the field effect transistor M2 to be turned off.

[0080] When the base of the transistor does not receive a high-level signal of the PG enable signal, the transistor Q2 is turned off. At this time, the capacitor C1 of the power supply unit 100 is discharged. The input voltage formed by the discharge of the capacitor C1 is divided by the first resistor R5, and a voltage that turns on the field effect transistor M2 is applied to the gate of the field effect transistor M2, thereby driving the field effect transistor M2 to turn on, so that the discharge resistor R4 is in a grounded state, so as to quickly discharge the capacitor C1.

[0081] Accordingly, when the base of transistor Q2 receives a high-level signal from the PG enable signal, the transistor turns on. After transistor Q2 turns on, the voltage between the first resistor R5 and the second resistor R6 is grounded, thereby reducing the gate voltage of field-effect transistor M2 and turning off field-effect transistor M2. At this time, bleeder resistor R4 is in an open-circuit state and stops working.

[0082] Specifically, the resistance values ​​of the first resistor R5 and the second resistor R6 can be flexibly set according to the on-state voltage of the field effect transistor M2 and the on / off voltage set by the power transmission protection unit 200 , and have high applicability.

[0083] Optionally, the transistor Q2 is an NPN transistor.

[0084] The NPN transistor is a current-controlled semiconductor device consisting of two N-type semiconductors and one P-type semiconductor, forming three regions: the emitter (N), the base (P), and the collector (N). When an appropriate forward bias voltage is applied to the base, the PN junction between the emitter and base conducts, and electrons are injected from the emitter into the base. Under the reverse bias between the collector and base, electrons are collected by the collector, forming a collector current. By controlling the base current, the collector current can be amplified or switched. NPN transistors offer strong current amplification capabilities and excellent stability.

[0085] In some embodiments, the present application also provides an electronic device including the above-mentioned automatic discharge reset circuit.

[0086] In this embodiment, by setting an automatic discharge reset circuit in the electronic device, when the electronic device is in a scenario where a quick reset and restart is required, the automatic discharge reset circuit can quickly discharge the power supply system, thereby quickly reducing the system voltage to below the undervoltage point, meeting the voltage requirements for system restart, and ensuring that the electronic device can be quickly restarted in usage scenarios that require quick power on and off.

[0087] Specifically, the electronic device may be a server, a laptop computer, a PC or other electronic product.

[0088] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0090] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0092] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a particular embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined in any way. To keep the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the appended claims.

[0094] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An automatic discharge reset circuit, characterized in that: It includes a power transmission protection unit, a control circuit and a discharge unit, wherein the power transmission protection unit and the discharge unit are connected to a power supply unit, and the control circuit is connected to the power transmission protection unit and the discharge unit respectively; The power transmission protection unit is configured to output a PG enable signal to the control circuit under normal working conditions; The control circuit is configured to control the discharge unit to perform pressure relief discharge on the power supply unit when the PG enable signal is not received.

2. The automatic discharge reset circuit according to claim 1, characterized in that: The discharge unit includes a discharge resistor, a first end of the discharge resistor is connected to the voltage output interface of the power supply unit, and the discharge resistor is connected to the control circuit; When the control circuit does not receive the PG enable signal, the control circuit controls the second end of the bleeder resistor to be grounded; When the control circuit receives the PG enable signal, the control circuit controls the second end of the bleeder resistor to be open.

3. The automatic discharge reset circuit according to claim 2, characterized in that: The control circuit includes a field effect transistor and a driving circuit, the drain of the field effect transistor is connected to the second end of the bleeder resistor, the source of the field effect transistor is grounded, and the field effect transistor is connected to the driving circuit; When the driving circuit does not receive the PG enable signal, the driving circuit drives the field effect transistor to be turned on, so that the second end of the bleeder resistor is grounded; When the driving circuit receives the PG enable signal, the driving circuit drives the field effect transistor to be turned off, so that the second end of the discharge resistor is open.

4. The automatic discharge reset circuit according to claim 3, characterized in that: The field effect transistor is an N-channel enhancement mode MOS transistor.

5. The automatic discharge reset circuit according to claim 3, characterized in that: The driving circuit includes a first resistor, a second resistor and a transistor; The first end of the first resistor is connected to the first end of the discharge resistor, and the second end of the first resistor is connected to the gate of the field effect transistor; The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the source of the field effect transistor; The collector of the transistor is connected to the gate of the field effect transistor, the emitter of the transistor is connected to the source of the field effect transistor, and the base of the transistor is connected to the PG enable signal interface of the power transmission protection unit.

6. The automatic discharge reset circuit according to claim 5, characterized in that: The transistor is configured to be turned off when the PG enable signal is not received, so as to drive the field effect transistor to be turned on; The transistor is configured to be turned on when receiving the PG enable signal to drive the field effect transistor to be turned off.

7. The automatic discharge reset circuit according to claim 5, characterized in that: The transistor is an NPN transistor.

8. The automatic discharge reset circuit according to any one of claims 1 to 7, characterized in that: The voltage input interface of the power transmission protection unit is connected to the voltage output interface of the power supply unit.

9. The automatic discharge reset circuit according to claim 8, characterized in that: The power transmission protection unit is an E-fuse.

10. An electronic device, characterized in that: The automatic discharge reset circuit comprises the automatic discharge reset circuit according to any one of claims 1 to 9.

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