Power protection circuit, method, device and computer storage medium

Abstract

The application relates to the technical field of power supply protection, and discloses a power supply protection circuit, a method, a device and a computer storage medium, the circuit comprising a voltage input port, an overvoltage protection unit, a triode unit, a current sampling resistor, a voltage dividing unit, a transistor unit and a voltage output port; the voltage input port is connected with the overvoltage protection unit, the triode unit and the current sampling resistor in sequence, the overvoltage protection unit determines overvoltage information, the current sampling resistor determines overcurrent information, and the triode unit determines first conduction information according to the overvoltage information and the overcurrent information; the current sampling resistor is connected with the triode unit and the voltage dividing unit in sequence, the triode unit is connected with the voltage dividing unit and the overvoltage protection unit, the voltage dividing unit is connected with the transistor unit, the transistor unit is connected with the voltage output port, the voltage dividing unit determines voltage dividing information, and the transistor unit determines actual output information according to the voltage dividing information or the first conduction information. The application reduces the protection cost of overcurrent and overvoltage protection of the power supply.

Description

Technical Field

[0001] This invention relates to the field of power protection technology, and in particular to a power protection circuit, method, device, and computer storage medium. Background Technology

[0002] With the rapid development of television products, users have increasingly higher requirements for the power supply of different televisions. They hope to not only meet the normal power supply needs of the television, but also improve the protection of the power supply itself and the entire television set. This also places higher demands on the power supply protection methods.

[0003] Traditional power supply protection relies on specific overcurrent or overvoltage detection chips to monitor the power supply's current and voltage, thereby protecting the power supply. This method has a significant drawback: the need for a specific chip to detect the power supply's current and voltage results in high costs for overcurrent and overvoltage protection. Summary of the Invention

[0004] The main objective of this invention is to provide a power supply protection circuit, method, device, and computer storage medium, aiming to solve the technical problem of reducing the protection cost of power supply overcurrent and overvoltage protection.

[0005] To achieve the above objectives, the present invention provides a power protection circuit, which includes a voltage input port, an overvoltage protection unit, a transistor unit, a current sampling resistor, a voltage divider unit, a transistor unit, and a voltage output port.

[0006] The voltage input terminal is sequentially connected to the overvoltage protection unit, the transistor unit, and the first terminal of the current sampling resistor. The overvoltage protection unit is used to determine the overvoltage information of the voltage input terminal, the current sampling resistor is used to determine the overcurrent information of the voltage input terminal, and the transistor unit is used to determine the first conduction information based on the overvoltage information and the overcurrent information.

[0007] The second end of the current sampling resistor is connected in sequence to the transistor unit and the voltage divider unit. The transistor unit is connected to the voltage divider unit and the overvoltage protection unit respectively. The voltage divider unit is connected to the transistor unit and the transistor unit is connected to the voltage output port. The voltage divider unit is used to determine the voltage division information. The transistor unit is used to determine the actual output information of the voltage output port based on the voltage division information or the first conduction information.

[0008] Optionally, the overvoltage protection unit includes a first resistor and a first Zener diode. The first end of the first resistor is connected to the voltage input port, and the second end of the first resistor is connected in sequence to the transistor unit and the cathode of the first Zener diode. The anode of the first Zener diode is connected to the system power ground.

[0009] Optionally, the transistor unit includes a second resistor, a third resistor, and a PNP transistor. The first end of the second resistor is connected to the voltage input port, the second end of the second resistor is connected to the emitter of the PNP transistor, the collector of the PNP transistor is connected to the voltage divider unit, the base of the PNP transistor is connected to the second end of the current sampling resistor and the first end of the third resistor, and the first end of the third resistor is connected to the second end of the first resistor.

[0010] Optionally, the voltage divider unit includes a fourth resistor, a fifth resistor, a second Zener diode, and a first capacitor. The first end of the fourth resistor, the cathode of the second Zener diode, and the first end of the first capacitor are sequentially connected to the second end of the current sampling resistor. The second end of the fourth resistor, the anode of the second Zener diode, and the second end of the first capacitor are sequentially connected to the collector of the PNP transistor. The first end of the first capacitor is connected to the transistor unit. The second end of the first capacitor is connected to both the transistor unit and the first end of the fifth resistor. The second end of the fifth resistor is connected to the system power ground.

[0011] Optionally, the transistor unit includes a PMOS transistor, a polarized capacitor, and a second capacitor. The source of the PMOS transistor is connected to the first terminal of the first capacitor, the gate of the PMOS transistor is connected to the second terminal of the first capacitor, the drain of the PMOS transistor is connected in sequence to the positive terminal of the polarized capacitor, the first terminal of the second capacitor, and the voltage output port, and the negative terminal of the polarized capacitor and the second terminal of the second capacitor are connected to the system power ground.

[0012] Furthermore, to achieve the above objectives, the present invention also provides a power supply protection method, which is applied to the power supply protection circuit, and the steps of the power supply protection method include:

[0013] The input voltage of the voltage input port is obtained, the voltage processing information corresponding to the input voltage is determined, and the voltage processing information is checked to see if it matches the preset normal input information.

[0014] If the voltage processing information matches the preset normal input information, the input voltage is divided by the voltage divider unit to obtain the divided voltage.

[0015] The PMOS transistor in the transistor unit is turned on based on the voltage divider to achieve power supply protection.

[0016] Optionally, after the step of detecting whether the voltage processing information matches the preset normal input information, the method includes:

[0017] If the voltage processing information does not match the preset normal input information, then it is detected whether the voltage processing information matches the preset overcurrent processing information.

[0018] If the voltage processing information matches the preset overcurrent processing information, a first turn-on voltage is provided to the PNP transistor in the transistor unit through the current sampling resistor, and the PNP transistor is turned on based on the first turn-on voltage.

[0019] Optionally, after the step of detecting whether the voltage processing information matches the preset overcurrent processing information, the method includes:

[0020] If the voltage processing information does not match the preset overcurrent processing information, the overvoltage protection unit provides a second turn-on voltage to the PNP transistor in the transistor unit, and turns on the PNP transistor based on the second turn-on voltage.

[0021] In addition, to achieve the above objectives, the present invention also provides a power protection device, the power protection device comprising: a memory, a processor, and a power protection program stored in the memory and executable on the processor, wherein the power protection program, when executed by the processor, implements the steps of the power protection method as described above.

[0022] In addition, to achieve the above objectives, the present invention also provides a computer storage medium storing a power protection program, which, when executed by a processor, implements the steps of the power protection method as described above.

[0023] The power protection circuit of this invention includes a voltage input port, an overvoltage protection unit, a transistor unit, a current sampling resistor, a voltage divider unit, a transistor unit, and a voltage output port. The voltage input port is sequentially connected to the overvoltage protection unit, the transistor unit, and the first end of the current sampling resistor. The overvoltage protection unit is used to determine overvoltage information at the voltage input port, the current sampling resistor is used to determine overcurrent information at the voltage input port, and the transistor unit is used to determine first conduction information based on the overvoltage and overcurrent information. The second end of the current sampling resistor is sequentially connected to the transistor unit and the voltage divider unit. The transistor unit is connected to both the voltage divider unit and the overvoltage protection unit. The voltage divider unit is connected to the transistor unit, and the transistor unit is connected to the voltage output port. The voltage divider unit is used to determine voltage division information, and the transistor unit is used to determine the actual output information of the voltage output port based on the voltage division information or the first conduction information. This circuit can determine the first conduction information based on overvoltage and overcurrent information, and then determine the actual output information based on the first conduction information and voltage divider information. This avoids the phenomenon in existing solutions where a specific chip is needed to detect the current and voltage of the power supply. This power protection circuit can achieve overvoltage and overcurrent protection by determining the actual output information through overvoltage and overcurrent information, which improves the functionality of the circuit. Moreover, it does not require the use of a specific chip, and power protection can be achieved through the circuit, thereby reducing the cost of overcurrent and overvoltage protection of the power supply. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the framework structure of an embodiment of the power protection circuit of the present invention;

[0026] Figure 2 This is a circuit diagram of the power protection circuit of the present invention;

[0027] Figure 3 This is a flowchart illustrating the application scenarios of the power protection circuit of the present invention.

[0028] Figure 4 This is a current flow diagram of the power protection circuit of the present invention;

[0029] Figure 5 This is a logic block diagram of the power protection circuit of the present invention;

[0030] Figure 6 This is a schematic diagram of the power protection device structure for the hardware operating environment involved in the embodiments of the present invention;

[0031] Figure 7 This is a flowchart illustrating the first embodiment of the power protection method of the present invention.

[0032] Explanation of icon numbers:

[0033]

[0034]

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] This invention proposes a power supply protection circuit.

[0040] In one embodiment of the present invention, such as Figure 1 As shown, Figure 1This is a schematic diagram of a power protection circuit according to an embodiment. The power protection circuit includes a voltage input port 10, an overvoltage protection unit 30, a transistor unit 40, a current sampling resistor 20, a voltage divider unit 50, a transistor unit 60, and a voltage output port 70.

[0041] The voltage input terminal 10 is sequentially connected to the overvoltage protection unit 30, the transistor unit 40, and the first terminal of the current sampling resistor 20. The overvoltage protection unit 30 is used to determine the overvoltage information of the voltage input terminal, the current sampling resistor 20 is used to determine the overcurrent information of the voltage input terminal, and the transistor unit 40 is used to determine the first conduction information based on the overvoltage information and the overcurrent information.

[0042] The second end of the current sampling resistor 20 is connected in sequence to the transistor unit 40 and the voltage divider unit 50. The transistor unit 40 is connected to the voltage divider unit 50 and the overvoltage protection unit 30, respectively. The voltage divider unit 50 is connected to the transistor unit 60, and the transistor unit 60 is connected to the voltage output port 70. The voltage divider unit is used to determine the voltage division information, and the transistor unit is used to determine the actual output information of the voltage output port based on the voltage division information or the first conduction information.

[0043] In this embodiment, to address the high cost of practical power supply overcurrent and overvoltage protection, we propose the technical solution of this application. This technical solution primarily aims to solve problems encountered in actual operating conditions. For example, if the AC-DC converter output voltage is too high, and the power supply cannot be shut off in time (when the AC-DC output power redundancy is large, supplying 12V to the TV motherboard), then the motherboard components will be damaged due to overvoltage. If an overcurrent occurs, according to the formula P = U * I, U remains constant, but I will increase. Furthermore, according to the heating formula W = I... 2 As Rt and I increase, W becomes quadratically related to I, leading to a sharp increase in heat generation. This will also accelerate the temperature rise of the DC-DC power devices. If the temperature exceeds the experimental standard, the test will fail. If this occurs during operation, it can severely damage the power devices, causing the entire television set to malfunction. P: Power, U: Voltage, I: Current, W: Work or Heat, t: Time, R: Resistance. (Refer to...) Figure 3 , Figure 3This is a flowchart illustrating an application scenario for a power protection circuit. The AC input passes through an AC-DC converter, resulting in a DC output. This DC output then passes through the device (power protection circuit) of this application, allowing the input power to power the TV motherboard's power supply unit. Without affecting normal circuit operation, when overvoltage or overcurrent occurs at the AC-DC output or DC-DC input / output, the device will shut off the AC-DC output or DC-DC input / output. This will not affect the normal operation of other circuits, and normal operation will resume when the fault disappears. In summary, the technical solution of this application can be used in the power supply design of electronic products with similar protection requirements. Specific applications can be made by slightly modifying the parameter values ​​according to actual usage. Specifically, a DC-DC converter refers to a DC power conversion device that converts DC power of different voltages to the required DC voltage; an AC-DC converter refers to a power conversion device that converts AC power to DC power; OVP: overvoltage protection, stopping output when the voltage exceeds a set value; OCP: overcurrent protection, stopping output when the current exceeds a set value.

[0044] In this embodiment, on one hand, the overvoltage protection unit 30 determines the overvoltage information at the voltage input terminal, and the current sampling resistor 20 determines the overcurrent information at the voltage input terminal. Then, the transistor unit 40 determines the first conduction information based on the overvoltage and overcurrent information. On the other hand, the voltage divider unit determines the voltage division information, and the transistor unit determines the actual output information of the voltage output port based on the voltage division information or the first conduction information. The overvoltage protection unit 30 determines whether the voltage at the voltage input terminal is overvoltage, and the current sampling resistor 20 determines whether the current at the voltage input terminal is overcurrent. Finally, the first conduction information of the transistor unit 40 is determined based on the overcurrent and overvoltage. Finally, the voltage divider unit determines the voltage division information and the first conduction information to determine the actual output information. Here, overvoltage information refers to whether there is overvoltage, overcurrent information refers to whether there is overcurrent, the first conduction information refers to the conduction information of the transistor in the transistor unit 40, the voltage divider information refers to the voltage of the voltage divider, and the actual output information refers to whether there is actual output. This application relates to a DC power supply (DC-DC conversion unit) input / output overvoltage (OVP) and overcurrent (OCP) protection device. This application's device can be used for overvoltage and overcurrent protection at the input and output terminals of DC-DC power supplies, as well as for overvoltage and overcurrent protection at the output terminal of AC-DC power supplies. This application primarily details its application in the field of television power supplies for overvoltage and overcurrent protection at both the AC-DC output and DC-DC input / output terminals. Furthermore, it achieves overcurrent and overvoltage protection through a low-cost circuit.

[0045] In one embodiment, reference is made to... Figure 2 As shown, Figure 2The circuit diagram is for a power protection circuit. The overvoltage protection unit 30 includes a first resistor R1 and a first Zener diode Z0. The first end of the first resistor R1 is connected to the voltage input port 10. The second end of the first resistor R1 is connected in sequence to the transistor unit 40 and the cathode of the first Zener diode Z0. The anode of the first Zener diode Z0 is connected to the system power ground.

[0046] Specifically, the transistor unit 40 includes a second resistor R2, a third resistor R3, and a PNP transistor Q1. The first end of the second resistor R2 is connected to the voltage input port 10, the second end of the second resistor R2 is connected to the emitter E of the PNP transistor Q1, the collector C of the PNP transistor Q1 is connected to the voltage divider unit 50, the base B of the PNP transistor Q1 is connected to the second end of the current sampling resistor 20 and the first end of the third resistor R3, and the first end of the third resistor R3 is connected to the second end of the first resistor R1.

[0047] Specifically, the voltage divider unit 50 includes a fourth resistor R4, a fifth resistor R5, a second Zener diode Z1, and a first capacitor C1. The first end of the fourth resistor R4, the cathode of the second Zener diode Z1, and the first end of the first capacitor C1 are sequentially connected to the second end of the current sampling resistor 20. The second end of the fourth resistor R4, the anode of the second Zener diode Z1, and the second end of the first capacitor C1 are sequentially connected to the collector C of the PNP transistor Q1. The first end of the first capacitor C1 is connected to the transistor unit 60. The second end of the first capacitor C1 is connected to both the transistor unit 60 and the first end of the fifth resistor R5. The second end of the fifth resistor R5 is connected to the system power ground.

[0048] Specifically, the transistor unit 60 includes a PMOS transistor Q2, a polarized capacitor JC1, and a second capacitor C2. The source S of the PMOS transistor Q2 is connected to the first terminal of the first capacitor C1, the gate G of the PMOS transistor Q2 is connected to the second terminal of the first capacitor C1, the drain D of the PMOS transistor Q2 is connected in sequence to the positive terminal of the polarized capacitor JC1, the first terminal of the second capacitor C2, and the voltage output port 70, and the negative terminal of the polarized capacitor JC1 and the second terminal of the second capacitor C2 are connected to the system power ground.

[0049] In this embodiment, when the circuit is operating normally without any protection issues (no overcurrent or overvoltage), the fifth resistor R5 and the fourth resistor R4 sample and divide the input voltage to drive the PMOS transistor Q2. Figure 2As shown, R5 = R4 = 10KΩ can be set. When the input is less than 22V, the two resistors share the voltage equally. The absolute value of the voltage at point A relative to point B (voltage at point A minus voltage at point B) is -11V, that is, the voltage difference between the gate and source of PMOS transistor Q2 is -11V. PMOS transistor Q2 is turned on, and the circuit outputs normally. However, since the second resistor R2 and PMOS transistor Q2 will consume some current, a certain voltage difference will be generated between the input and output. That is, the output voltage will be about 0.3V lower than the input voltage, which is within the normal error range. The resistance values ​​of the fifth resistor R5 and the fourth resistor R4 can be set according to the actual conduction requirements and the input voltage. When an overvoltage event (OVP) occurs, the overvoltage threshold is set to 27V (with a 22.7% margin, which can be adjusted according to actual needs) through the first Zener diode Z0. When the input voltage fluctuation exceeds 27V, the first Zener diode Z0 starts to conduct. R1 = 5.1KΩ acts on the first Zener diode Z0 to prevent excessive current from causing the Zener diode to overheat or even be damaged by heat. When the first Zener diode Z0 conducts, current flows through the base (b) of the PNP transistor Q1, turning on the PNP transistor Q1. Since the collector-emitter junction (CE) of the PNP transistor Q1 is connected in parallel between the gate and source (GS) of the PMOS transistor Q2, the GS of the PMOS transistor Q2 will be clamped at -0.3V by the collector-emitter junction of the PNP transistor Q1. The PMOS transistor Q2 loses its -11V drive voltage and turns off. After the PMOS transistor Q2 turns off, there is no voltage output to power the equipment, thus achieving the function of overvoltage protection. When an overcurrent (OCP) occurs, this paper samples the current through a current sampling resistor 20. When the overcurrent point is set to 5A, the current sampling resistor 20 is 60mΩ (0.06Ω, the resistance value of the current sampling resistor can be set according to the requirements). When the current exceeds 5A, a voltage difference of 0.3V will be generated across the current sampling resistor 20. This 0.3V voltage difference will cause the EB (emitter-base) of the PNP transistor Q1 to conduct, thereby turning on the CE terminal of the PNP transistor Q1. Similarly, the GS (gate-source) of the PMOS transistor Q2 will be clamped at -0.3V by the CE terminal of the PNP transistor Q1, thereby causing the GS (gate-source) of the PMOS transistor Q2 to lose the -11V driving voltage and turn off. After the PMOS transistor Q2 is turned off, there will be no voltage to supply power to the electrical equipment, thus achieving the function of overcurrent protection. Overvoltage and overcurrent protection are achieved through the first Zener diode Z0 and the current sampling resistor 20 in the circuit, thus realizing power supply protection with a simple circuit, reducing the cost of power supply protection and enhancing the functionality of single protection.

[0050] This embodiment of the power protection circuit includes a voltage input port, an overvoltage protection unit, a transistor unit, a current sampling resistor, a voltage divider unit, a transistor unit, and a voltage output port. The voltage input port is sequentially connected to the overvoltage protection unit, the transistor unit, and the first end of the current sampling resistor. The overvoltage protection unit is used to determine the overvoltage information of the voltage input port, the current sampling resistor is used to determine the overcurrent information of the voltage input port, and the transistor unit is used to determine the first conduction information based on the overvoltage information and the overcurrent information. The second end of the current sampling resistor is sequentially connected to the transistor unit and the voltage divider unit. The transistor unit is connected to both the voltage divider unit and the overvoltage protection unit. The voltage divider unit is connected to the transistor unit, and the transistor unit is connected to the voltage output port. The voltage divider unit is used to determine the voltage division information, and the transistor unit is used to determine the actual output information of the voltage output port based on the voltage division information or the first conduction information. This circuit can determine the first conduction information based on overvoltage and overcurrent information, and then determine the actual output information based on the first conduction information and voltage divider information. This avoids the phenomenon in existing solutions where a specific chip is needed to detect the current and voltage of the power supply. This power protection circuit can achieve overvoltage and overcurrent protection by determining the actual output information through overvoltage and overcurrent information, which improves the functionality of the circuit. Moreover, it does not require the use of a specific chip, and power protection can be achieved through the circuit, thereby reducing the cost of overcurrent and overvoltage protection of the power supply.

[0051] Furthermore, refer to Figure 6 , Figure 6 This is a schematic diagram of the power protection device structure for the hardware operating environment involved in the embodiments of the present invention.

[0052] like Figure 6 As shown, the power protection device may include: a processor 0003, such as a central processing unit (CPU), a communication bus 0001, an acquisition interface 0002, a processing interface 0004, and a memory 0005. The communication bus 0001 is used to establish communication between these components. The acquisition interface 0002 may include an information acquisition device or acquisition unit, such as a computer; optionally, the acquisition interface 0002 may also include a standard wired interface or a wireless interface. The processing interface 0004 may optionally include a standard wired interface or a wireless interface. The memory 0005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 0005 may also be a storage device independent of the aforementioned processor 0003.

[0053] Those skilled in the art will understand that Figure 6 The structure shown does not constitute a limitation on the power protection device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0054] like Figure 6 As shown, the memory 0005, which is a computer storage medium, may include an operating system, an acquisition interface module, a processing interface module, and a power protection program.

[0055] exist Figure 6 In the power protection device shown, the communication bus 0001 is mainly used to realize the connection and communication between components; the acquisition interface 0002 is mainly used to connect to the backend server and communicate data with the backend server; the processing interface 0004 is mainly used to connect to the deployment end (user end) and communicate data with the deployment end; the processor 0003 and the memory 0005 in the power protection device of the present invention can be set in the power protection device. The power protection device calls the power protection program stored in the memory 0005 through the processor 0003 and executes the power protection method provided in the embodiment of the present invention.

[0056] Furthermore, refer to, for example Figure 7 As shown, a flowchart illustrating a first embodiment of the power protection method of the present invention is presented based on an embodiment of the above-described power protection circuit. The steps of the power protection method include:

[0057] Step S10: Obtain the input voltage of the voltage input port, determine the voltage processing information corresponding to the input voltage, and detect whether the voltage processing information matches the preset normal input information;

[0058] In this embodiment, refer to Figure 3 , Figure 3This is a flowchart illustrating an application scenario for a power protection circuit. An adapter or similar power supply is used as the input power source (22V output from the adapter / voltage input of the invention's device), corresponding to a 22V DC input in the schematic diagram. Overvoltage and overcurrent protection devices are connected to this input (the output is 21.7V due to losses, the output from the device being used), which is then connected to the device itself. In other words, the device is connected in series between the input and output. In a TV, this device is connected in series at the AC-DC power output to provide pre-amplitude protection for the TV's mainboard, preventing damage to the mainboard components due to overvoltage or overcurrent. By acquiring the input voltage at the voltage input port, determining the voltage processing information corresponding to the input voltage, and detecting whether the voltage processing information matches the preset normal input information, the input voltage refers to the actual input voltage and current values. The voltage processing information indicates whether the input voltage needs to be processed. This information is mainly obtained by detecting overvoltage through the first Zener diode Z0 and overcurrent through the current sampling resistor 20. When the voltage processing information indicates no overvoltage and no overcurrent, it refers to the preset normal input information, and the voltage divider unit 50 will control the PMOS transistor Q2 in the transistor unit 60 to conduct and output. Otherwise, no output will be output, and a power protection step will be performed. The step of detecting whether the voltage processing information matches the preset normal input information includes:

[0059] Step S11: If the voltage processing information does not match the preset normal input information, then detect whether the voltage processing information matches the preset overcurrent processing information.

[0060] Step S12: If the voltage processing information matches the preset overcurrent processing information, then a first turn-on voltage is provided to the PNP transistor in the transistor unit through the current sampling resistor, and the PNP transistor is turned on based on the first turn-on voltage.

[0061] In this embodiment, when the voltage processing information does not match the preset normal input information, it will detect whether the voltage processing information matches the preset overcurrent processing information. The overcurrent processing information refers to the processing steps after an input overcurrent. A first turn-on voltage will be provided to the PNP transistor in the transistor unit through the current sampling resistor. Based on the first turn-on voltage, the PNP transistor will be turned on, that is, a voltage will be provided to the transistor to turn it on. Based on the transistor's turn-on, the PMOS transistor will be prevented from turning on, thus achieving power supply overcurrent protection. The first turn-on voltage is provided by the current sampling resistor in the voltage protection unit. After the step of detecting whether the voltage processing information matches the preset overcurrent processing information, the following steps are included:

[0062] Step S13: If the voltage processing information does not match the preset overcurrent processing information, the overvoltage protection unit provides a second turn-on voltage to the PNP transistor in the transistor unit, and turns on the PNP transistor based on the second turn-on voltage.

[0063] In this embodiment, when the voltage processing information does not match the preset overcurrent processing information, the voltage protection unit provides a second turn-on voltage to the PNP transistor in the transistor unit. Based on this second turn-on voltage, the PNP transistor is turned on, meaning a voltage is provided to the transistor to turn it on. This turn-on of the transistor prevents the PMOS transistor from turning on, thus achieving power overvoltage protection. The second turn-on voltage is provided by the first Zener diode z0 in the voltage protection unit. This application operates in two states: one is normal operation with Q2 turned on, where the input of the device provides energy to the output. The working principle in this state is to use voltage divider sampling resistors R5 and R4 to provide a driving voltage of -11V to the gate-source (S) of Q2 (source connected to 22V, gate connected to the divided 11V, V...). g-s The absolute voltage is -11V, which turns Q2 on. The second operating state is when Q2 is turned off when overvoltage or overcurrent protection is triggered. The principle of this is that when overvoltage or overcurrent occurs, the P-transistor of transistor Q1 is turned on, clamping the gate-source voltage of Q2 at -0.3V, so that Q2 loses its driving voltage and turns off, thereby cutting off the input and output.

[0064] Step S20: If the voltage processing information matches the preset normal input information, the input voltage is divided by the voltage divider unit to obtain the divided voltage.

[0065] In this embodiment, when the voltage processing information matches the preset normal input information, the input voltage is divided by the voltage divider unit to obtain a divided voltage, which is a voltage that can turn on the PMOS transistor. The divided voltage refers to the voltage obtained by dividing the voltage through the resistor in the voltage divider unit, and it can be used to drive the PMOS transistor.

[0066] Step S30: Based on the voltage divider, turn on the PMOS transistor in the transistor unit to achieve power supply protection.

[0067] In this embodiment, the PMOS transistor in the voltage divider unit is turned on to achieve power supply protection. That is, the PMOS transistor will only conduct and output voltage if the voltage divider voltage meets the conduction condition; otherwise, power supply protection will be activated. By fully utilizing the saturation conduction property of the transistor, the drive voltage of the PMOS transistor can be clamped at -0.3V when it is triggered to conduct, thus turning off the PMOS transistor drive, i.e., Q2 is turned off. It also supports overvoltage and overcurrent protection, achieving two protection functions in one circuit device. Furthermore, the circuit can be built for mass production. Testing has shown that it fully conforms to the above-described operating logic, achieving the required functions. It requires few components, has low cost, and a simple and feasible principle. This invention effectively solves practical problems, has strong execution capability, and a wide range of applications. Other application scenarios can be further modified with slight modifications, making this device a very practical and reliable invention. Furthermore, through the proper use of the circuit, it can effectively solve the problems of input and output overvoltage and overcurrent protection, effectively address the reliability issues of DC-DC conversion circuits under abnormal conditions, and improve the quality and performance of power supply products.

[0068] Furthermore, a logic block diagram of a power protection circuit is also provided for this embodiment, referring to... Figure 5 In this embodiment, when a voltage is input, it passes through a current sampling resistor and a current-limiting resistor 1 to reach Zener diode 1. The current sampling resistor is used to determine whether the input voltage is overcurrent, and Zener diode 1 is used to determine whether the input voltage is overvoltage. When the input voltage is overcurrent or overvoltage, it turns on the transistor through the emitter (e) of the P-type transistor, ultimately maintaining the voltage between the base (b) and collector (c) of the transistor at the turn-on voltage of 0.3V. Since the base and collector of the transistor are directly connected to the two ends of the driving P-type transistor (between the gate and source of the PMOS transistor), the driving P-type transistor cannot be driven, thus preventing the entire circuit from conducting and protecting the circuit from overvoltage or overcurrent. When the input voltage is neither overcurrent nor overvoltage, Zener diode 2 regulates the output voltage. Furthermore, the input voltage can be divided by voltage divider resistors 1 and 2, ultimately driving the driving P-type transistor to achieve normal voltage output. This avoids the need for specific chips to detect the current and voltage of the power supply, as is present in existing solutions. This power protection circuit determines the actual output information through overvoltage and overcurrent information, thereby achieving overvoltage and overcurrent protection. This improves the functionality of the circuit and eliminates the need for specific chips. Power protection can be achieved through the circuit itself, thus reducing the cost of overcurrent and overvoltage protection for the power supply.

[0069] The present invention also provides a power protection device.

[0070] The device of the present invention includes: a memory, a processor, and a power protection program stored in the memory and executable on the processor, wherein when the power protection program is executed by the processor, it implements the steps of the power protection method as described above.

[0071] The present invention also provides a computer storage medium.

[0072] The computer storage medium of the present invention stores a power protection program, which, when executed by a processor, implements the steps of the power protection method described above.

[0073] The method implemented when the power protection program running on the processor is executed can be referred to in various embodiments of the power protection method of the present invention, and will not be repeated here.

[0074] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A power supply protection circuit, characterized in that, The power protection circuit includes a voltage input port, an overvoltage protection unit, a transistor unit, a current sampling resistor, a voltage divider unit, a transistor unit, and a voltage output port. The voltage input terminal is sequentially connected to the overvoltage protection unit, the transistor unit, and the first terminal of the current sampling resistor. The overvoltage protection unit is used to determine the overvoltage information of the voltage input terminal, the current sampling resistor is used to determine the overcurrent information of the voltage input terminal, and the transistor unit is used to determine the first conduction information based on the overvoltage information and the overcurrent information. The second terminal of the current sampling resistor is sequentially connected to the transistor unit and the voltage divider unit. The transistor unit is connected to the voltage divider unit and the overvoltage protection unit. The voltage divider unit is connected to the transistor unit and the transistor unit is connected to the voltage output port. The voltage divider unit is used to determine voltage division information. The transistor unit is used to determine the actual output information of the voltage output port based on the voltage division information or the first conduction information. The overvoltage protection unit includes a first resistor and a first Zener diode. The first terminal of the first resistor is connected to the voltage input port. The second terminal is connected in sequence to the cathode of the transistor unit and the cathode of the first Zener diode. The anode of the first Zener diode is connected to the system power ground. The transistor unit includes a second resistor, a third resistor, and a PNP transistor. The first terminal of the second resistor is connected to the voltage input port. The second terminal of the second resistor is connected to the emitter of the PNP transistor. The collector of the PNP transistor is connected to the voltage divider unit. The base of the PNP transistor is connected to the second terminal of the current sampling resistor and the first terminal of the third resistor, respectively. The first terminal of the third resistor is connected to the second terminal of the first resistor.

2. The power protection circuit as described in claim 1, characterized in that, The voltage divider unit includes a fourth resistor, a fifth resistor, a second Zener diode, and a first capacitor. The first end of the fourth resistor, the cathode of the second Zener diode, and the first end of the first capacitor are sequentially connected to the second end of the current sampling resistor. The second end of the fourth resistor, the anode of the second Zener diode, and the second end of the first capacitor are sequentially connected to the collector of the PNP transistor. The first end of the first capacitor is connected to the transistor unit. The second end of the first capacitor is connected to both the transistor unit and the first end of the fifth resistor. The second end of the fifth resistor is connected to the system power ground.

3. The power protection circuit as described in claim 2, characterized in that, The transistor unit includes a PMOS transistor, a polarized capacitor, and a second capacitor. The source of the PMOS transistor is connected to the first terminal of the first capacitor, the gate of the PMOS transistor is connected to the second terminal of the first capacitor, the drain of the PMOS transistor is connected in sequence to the positive terminal of the polarized capacitor, the first terminal of the second capacitor, and the voltage output port, and the negative terminal of the polarized capacitor and the second terminal of the second capacitor are connected to the system power ground.

4. A power supply protection method, characterized in that, The power protection method is applied to the power protection circuit of any one of claims 1 to 3, and the steps of the power protection method include: The input voltage of the voltage input port is obtained, the voltage processing information corresponding to the input voltage is determined, and the voltage processing information is checked to see if it matches the preset normal input information. If the voltage processing information matches the preset normal input information, the input voltage is divided by the voltage divider unit to obtain the divided voltage. The PMOS transistor in the transistor unit is turned on based on the voltage divider to achieve power supply protection.

5. The power supply protection method as described in claim 4, characterized in that, After the step of detecting whether the voltage processing information matches the preset normal input information, the following steps are included: If the voltage processing information does not match the preset normal input information, then it is detected whether the voltage processing information matches the preset overcurrent processing information. If the voltage processing information matches the preset overcurrent processing information, a first turn-on voltage is provided to the PNP transistor in the transistor unit through the current sampling resistor, and the PNP transistor is turned on based on the first turn-on voltage.

6. The power supply protection method as described in claim 5, characterized in that, After the step of detecting whether the voltage processing information matches the preset overcurrent processing information, the following steps are included: If the voltage processing information does not match the preset overcurrent processing information, the overvoltage protection unit provides a second turn-on voltage to the PNP transistor in the transistor unit, and turns on the PNP transistor based on the second turn-on voltage.

7. A power protection device, characterized in that, The power protection device includes: a memory, a processor, and a power protection program stored in the memory and executable on the processor, wherein when the power protection program is executed by the processor, it implements the steps of the power protection method as described in any one of claims 4 to 6.

8. A computer storage medium, characterized in that, The computer storage medium stores a power protection program, which, when executed by a processor, implements the steps of the power protection method as described in any one of claims 4 to 6.

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