Circuit with self-locking protection and release functions and energy storage power supply

Abstract

The utility model provides a circuit with self-locking protection and release functions and an energy storage power supply. The circuit comprises a power supply unit, a sampling unit, a self-locking unit, a switch unit and a load unit, the voltage between the power supply unit and the input end of the load unit is collected through the sampling unit, the sampling voltage signal is obtained, whether the power supply of the electric equipment is over-current or short-circuited is judged through the reference voltage of the comparator, the circuit structure is simple, the cost is low, the response speed is high, and the protection efficiency of the circuit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, in particular to a circuit and an energy storage power supply with self-locking protection and release functions. Background Art

[0002] With the rapid development of society, various electrical and electronic equipment are used in all walks of life. To use these equipment normally, they need to be powered by a DC power supply. However, during the power supply process, overcurrent is easily generated due to load short circuit, load overload and other reasons, resulting in equipment burning and damage, and even major safety accidents such as fire. Therefore, it is necessary to configure an overcurrent self-locking safety protection circuit between the load device end and the power supply end. The existing overcurrent self-locking safety protection circuit design mainly includes: using overcurrent protection IC (Integrated Circuit) to achieve overcurrent protection, and using software to detect overcurrent and control shutdown to achieve overcurrent protection. Among them, the parameters of the overcurrent protection IC are fixed, the applicability is poor, and there are problems such as long delivery time, unstable supply, and high price; the application scope of using software to detect overcurrent and control shutdown is small, this method is slow to respond, and has a high dependence on software. If load overcurrent occurs when the software task is blocked, the software cannot detect the overcurrent in time and control the shutdown action. Utility Model Content

[0003] Therefore, it is necessary to provide a circuit with self-locking protection and release functions to solve the problems of complex structure, high cost and inability of software to detect overcurrent in time in existing self-locking circuits.

[0004] To achieve the above object, the utility model provides a circuit with self-locking protection and release function, which includes a power supply unit, a sampling unit, a self-locking unit, a switch unit and a load unit;

[0005] The power supply unit is connected to the input end of the load unit;

[0006] The input end of the sampling unit is connected between the input end of the power supply unit and the input end of the load unit, and the output end is connected to the input end of the self-locking unit;

[0007] The self-locking unit includes a comparator, a reference voltage point and a self-locking diode, the reference voltage point is connected to the inverting input terminal of the comparator, the output terminal of the comparator is connected to the positive terminal of the self-locking diode and then connected to the non-inverting input terminal of the comparator, and the output terminal of the sampling unit is connected to the non-inverting input terminal of the comparator;

[0008] The switch unit includes a first N-type transistor and a second N-type transistor, wherein the gate of the first N-type transistor is connected to the output end of the comparator, the source is grounded, and the drain is connected to the gate of the second N-type transistor; the source of the second N-type transistor is grounded, and the drain and the gate of the second N-type transistor are connected to the output end of the load unit.

[0009] Further, the sampling unit includes a current detection amplifier and a sampling resistor;

[0010] The sampling resistor is connected between the power supply unit and the input end of the load unit;

[0011] The in-phase input terminal and the inverting input terminal of the current detection amplifier are respectively connected to the two ends of the sampling resistor, and the output terminal of the current detection amplifier is connected to the input terminal of the self-locking unit.

[0012] Furthermore, it also includes an unlocking unit, which includes a third N-type transistor and a sampling signal terminal, and the sampling signal terminal is connected to the gate of the third N-type transistor; the source of the third N-type transistor is grounded, and the drain is connected to the in-phase input terminal of the comparator.

[0013] Furthermore, the reference voltage point is obtained by voltage division by a first voltage-dividing resistor and a second voltage-dividing resistor.

[0014] Furthermore, it also includes a processor, and the sampling signal end is connected to the signal output end of the processor.

[0015] Furthermore, an output end of the self-locking unit is connected to a signal input end of the processor.

[0016] Furthermore, it also includes a first power chip and a second power chip, the first power chip is connected to the power supply unit, the output end of the power chip is connected to the input end of the second power chip, and the output end of the second power chip is connected to the power end of the sampling unit, the comparator and the processor.

[0017] Furthermore, it also includes an LCD display screen, and the LCD display screen is connected to the signal output end of the processor.

[0018] An energy storage power supply comprises a circuit with self-locking protection and release functions, wherein the circuit with self-locking protection and release functions is any one of the circuits with self-locking protection and release functions described above.

[0019] Different from the prior art, the above technical solution adopts a power supply unit, a sampling unit, a self-locking unit, a switch unit and a load unit; when the load unit works normally, the sampling voltage signal obtained by the sampling unit is low, the reference voltage signal is greater than the sampling voltage signal, the comparator outputs a low-level signal, the self-locking diode is cut off, the comparator outputs a low-level signal to the gate of the first N-type transistor, and the gate of the second N-type transistor is a high-level signal, so that the second N-type transistor is turned on, the power supply unit provides electrical energy to the electrical equipment through the second N-type transistor, and the load unit continues to work normally. When the load unit is overcurrent or short-circuited, the sampling voltage signal obtained by the sampling unit is greater than the reference voltage signal, the comparator outputs a high-level signal to the first N-type transistor, the gate of the second N-type transistor is a low-level signal, the second N-type transistor is disconnected, and the power supply unit cannot provide power to the electrical equipment through the second N-type transistor; at the same time, the high-level signal output by the comparator is forwarded to the in-phase input terminal of the comparator through the self-locking diode, which is used to form positive feedback with the raised input signal, and stabilize the output signal of the comparator at a high level. Even after the output of the voltage output terminal is normal, the comparator continues to output a high-level signal. In the case of power failure, the output signal will always be a high level. At this time, unless the power is turned on again, the comparator will cycle like this to realize the self-locking function, and continue to keep the second N-type transistor in a disconnected state to protect the electrical equipment. The utility model collects the voltage between the input terminals of the power supply unit and the load unit through the sampling unit to obtain the sampling voltage signal, and then judges whether the power supply of the electrical equipment is overcurrent or short-circuited by comparing it with the reference voltage of the comparator. The circuit structure is simple, the cost is low, the reaction speed is fast, and the protection efficiency of the circuit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the module structure of a circuit with self-locking protection and release functions of the utility model;

[0021] Figure 2 This is a schematic diagram of a circuit structure with self-locking protection and release functions of the utility model;

[0022] Figure 3 This is a schematic diagram of the circuit structure of the processor MCU of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the first power chip of the utility model;

[0024] Figure 5 It is a schematic diagram of the structure of the second power chip of the utility model.

[0025] Description of reference numerals:

[0026] 10. Power supply unit; 20. Sampling unit; 30. Load unit; 40. Switch unit; 50. Self-locking unit. DETAILED DESCRIPTION

[0027] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0028] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0029] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0030] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0031] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0032] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0033] Similar to the understanding in the Patent Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0034] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0035] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] See also Figure 1-5 As shown, the utility model provides a circuit with self-locking protection and release functions, which includes a power supply unit 10, a sampling unit 20, a self-locking unit 50, a switch unit 40 and a load unit 30;

[0037] The power supply unit 10 is connected to the input end of the load unit 30;

[0038] The input end of the sampling unit 20 is connected between the input end of the power supply unit 10 and the input end of the load unit 30, and the output end is connected to the input end of the self-locking unit 50;

[0039] The self-locking unit 50 includes a comparator U14, a reference voltage point and a self-locking diode D8, wherein the reference voltage point is connected to the inverting input terminal of the comparator U14, the output terminal of the comparator U14 is connected to the positive terminal of the self-locking diode D8 and then connected to the non-inverting input terminal of the comparator U14, and the output terminal of the sampling unit 20 is connected to the non-inverting input terminal of the comparator U14;

[0040] The switch unit 40 includes a first N-type transistor Q37 and a second N-type transistor Q36, wherein the gate of the first N-type transistor Q37 is connected to the output end of the comparator U14, the source is grounded, and the drain is connected to the gate of the second N-type transistor Q36; the source of the second N-type transistor Q36 is grounded, and the drain and the gate of the second N-type transistor Q36 are connected to the output end of the load unit 30.

[0041] The power supply unit 10 is used to provide power, such as a DC power supply or an energy storage battery. Preferably, the power supply unit 10 is a lithium battery, such as the power supply unit 10 is a lithium iron phosphate battery or a ternary lithium battery. In some embodiments, the connection end of the power supply unit 10 is a BAT+ end, which can be connected to the energy storage battery through the BAT+ end. The input end CIG+ of the load unit 30 is connected to the BAT+ end, and the output end CIG- is connected to the drain of the second N-type transistor Q36. Through these two ends, it can be connected to the power supply unit 10, so that the power supply unit 10 supplies power to the electrical device GIGP1 on the load unit 30. The sampling unit 20 provides a sampling voltage signal related to the output current of the power supply unit 10 to the self-locking unit 50. The above-mentioned self-locking unit 50 is used to realize a circuit that detects the circuit condition and quickly has self-locking protection and release functions when the circuit is overcurrent or short-circuited. The comparator U14 of the self-locking unit 50 compares the sampled voltage signal with the reference voltage signal, and outputs a sampling signal to the first N-type transistor Q37. The first N-type transistor Q37 transmits it to the second N-type transistor Q36 for control, and then controls the power supply of the load unit 30, thereby affecting the power supply of the electrical equipment GIGP1 on the load unit 30. When the electrical equipment GIGP1 is overcurrent or short-circuited, it is disconnected in time, and the electrical equipment GIGP1 is controlled and protected to prevent the electrical equipment GIGP1 from overcurrent due to load short circuit, load overload, etc., which causes the electrical equipment GIGP1 to burn and be damaged, thereby reducing the risk of burning the electrical equipment GIGP1.

[0042] The specific working principle is as follows: when the load unit 30 is working normally, the sampling voltage signal obtained by the sampling unit 20 is low, the reference voltage signal is greater than the sampling voltage signal, the comparator U14 outputs a low level signal, the self-locking diode D8 is cut off, the comparator U14 outputs a low level signal to the gate of the first N-type transistor Q37, and the gate of the second N-type transistor Q36 is a high level signal, so that the second N-type transistor Q36 is turned on, the power supply unit 10 provides power to the electrical equipment GIGP1 through the second N-type transistor Q36, and the load unit 30 continues to work normally. When the load unit 30 is overcurrent or short-circuited, the sampling voltage signal obtained by the sampling unit 20 is greater than the reference voltage signal, and the comparator U14 outputs a high-level signal to the first N-type transistor Q37, and the gate of the second N-type transistor Q36 is a low-level signal, so that the second N-type transistor Q36 is disconnected, and the power supply unit 10 cannot provide power to the electrical device GIGP1 through the second N-type transistor Q36; at the same time, the high-level signal output by the comparator U14 is forward-conducted to the non-inverting input terminal of the comparator U14 through the self-locking diode D8, which is used to form positive feedback with the raised input signal, and stabilize the output signal of the comparator at a high level. Even after the output of the voltage output terminal is normal, the comparator U14 continues to output a high-level signal. In the case of power failure, the output signal will always be at a high level. At this time, unless the power is turned on again, the comparator U14 will cycle in this way to realize the self-locking function, and continue to keep the second N-type transistor Q36 in a disconnected state to protect the electrical device GIGP1. The utility model collects the voltage between the input terminals of the power supply unit 10 and the load unit 30 through the sampling unit 20 to obtain a sampled voltage signal, and then determines whether the power supply of the electrical device GIGP1 is overcurrent or short-circuited through the reference voltage of the comparator U14. The circuit structure is simple, the cost is low, the response speed is fast, and the protection efficiency of the circuit is improved.

[0043] The sampling unit 20 can be a power sampling, current sampling, voltage sampling, etc. mode, and output a sampled voltage signal. In some embodiments, the sampling unit 20 can include a current detection amplifier U10 and a sampling resistor R17; the sampling resistor R17 is connected between the power supply unit 10 and the input end of the load unit 30; the in-phase input end and the inverting input end of the current detection amplifier U10 are respectively connected to the two ends of the sampling resistor R17, and the output end of the current detection amplifier U10 is connected to the input end of the self-locking unit 50.

[0044] The sampling unit 20 provides a sampling voltage related to the output current of the power supply unit 10 to the self-locking unit 50; specifically, the current detection amplifier U10 collects the voltage on both sides of the sampling resistor R17, compares the voltage on both sides of the sampling resistor R17, and outputs a sampling voltage signal to the comparator U14 of the self-locking unit 50 to realize the sampling output function. The current detection amplifier U10 collects the voltage on both sides of the sampling resistor R17 connected to the power supply unit 10, obtains the sampling voltage signal, and judges whether the power supply of the electrical device GIGP1 is overcurrent through the reference voltage of the comparator U14. The circuit structure is simple, the cost is low, the response speed is fast, and the protection efficiency of the circuit is improved.

[0045] In the present invention, by adjusting the reference voltage of the reference voltage point, the comparison voltage can be changed, so that the voltage triggered by the sampling voltage of the control unit can be changed, and the overcurrent size can be adjusted. The voltage of the reference voltage point is generally much smaller than the working voltage of the comparator U14, such as 1.8V in the present invention, so that once the sampling voltage is slightly greater than the voltage of the reference voltage point, the comparator U14 can output a high-level signal, quickly turn on the self-locking diode D8 and self-lock, and achieve rapid action. The reference voltage point can be obtained by using a reference voltage chip. In the present invention, in order to obtain the reference voltage point of the comparator U14, the reference voltage point is obtained by dividing the voltage of the first voltage-dividing resistor R160 and the second voltage-dividing resistor R164, one end of the first voltage-dividing resistor R160 is connected to the power supply, the other end of the first voltage-dividing resistor R160 is connected to one end of the second voltage-dividing resistor R164 and the inverting input end of the comparator U14, and the other end of the second voltage-dividing resistor R164 is grounded. Because the reference voltage point in the utility model needs to be accurately calculated, the stability of the power supply is relatively high. In order to prevent the power output from being interfered by harmonics, a capacitor C127 is also connected to the ground at the output end of the power supply. By adjusting the size of the voltage divider resistor, the reference voltage point can be changed.

[0046] The above-mentioned circuit with self-locking protection and release function also includes an unlocking unit, which includes a third N-type transistor Q1 and a sampling signal terminal LK_OPEN, and the sampling signal terminal LK_OPEN is connected to the gate of the third N-type transistor Q1; the source of the third N-type transistor Q1 is grounded, and the drain is connected to the in-phase input terminal of the comparator U14.

[0047] When the sampling unit 20 is in the self-locking state, the sampling signal terminal LK_OPEN outputs a high-level signal to the gate of the third N-type transistor Q1. At this time, the drain of the third N-type transistor Q1 transmits a low-level signal to the in-phase input terminal of the comparator U14. The reference voltage signal transmitted by the reference voltage point to the inverting input terminal of the comparator U14 is greater than the low-level signal transmitted by the drain of the third N-type transistor Q1. The comparator U14 outputs a low-level signal, and the self-locking diode D8 releases the self-locking function. The self-locking function of the self-locking unit 50 can be unlocked without disconnecting the power supply unit 10.

[0048] The sampling signal terminal LK_OPEN can be connected to the signal output terminal of the processor MCU. The processor MCU can be a single chip microcomputer. Preferably, the processor MCU is a GD32F series chip, which can realize more complex control functions. The processor MCU is used to control the sampling signal terminal LK_OPEN to output a high level signal. When the load unit 30 is overcurrent or short-circuited, the self-locking unit 50 falls into self-locking, and the sampling signal terminal LK_OPEN needs to output a high level signal. The processor MCU controls the sampling signal terminal LK_OPEN to output a high level signal, and the sampling signal terminal LK_OPEN outputs a high level signal to the gate of the third N-type transistor Q1. At this time, the drain of the third N-type transistor Q1 transmits a low level signal to the in-phase input terminal of the comparator U14. The reference voltage signal transmitted by the reference voltage point to the inverting input terminal of the comparator U14 is greater than the low level signal transmitted by the drain of the third N-type transistor Q1. The comparator U14 outputs a low level signal, and the self-locking diode D8 releases the self-locking function. In order to enable the processor MCU to know in time when the self-locking unit 50 is locked, the output end of the self-locking unit 50 can be connected to the signal input end DC_OCP of the processor MCU. When the load unit 30 is in overcurrent operation or short circuit, the processor MCU receives the high-level signal output from the output end of the self-locking unit 50, and outputs a high-level signal to the sampling signal end LK_OPEN at the same time. The reference voltage signal transmitted by the reference voltage point to the inverting input end of the comparator U14 is greater than the low-level signal transmitted by the drain of the third N-type transistor Q1, and the comparator U14 outputs a low-level signal, and the self-locking diode D8 releases the self-locking function.

[0049] In the present invention, in order to realize the monitoring of overcurrent or short circuit of the circuit and facilitate human observation, an LCD display screen is also included, and the LCD display screen is connected to the signal output end of the processor MCU. The output end of the self-locking unit 50 is connected to the signal input end DC_OCP of the processor MCU. When the self-locking unit 50 outputs a high-level signal, the signal input end DC_OCP of the processor MCU receives a high-level signal, and the processor MCU can detect the overcurrent or short circuit protection. The signal output end of the processor MCU can further make an LCD display of the situation, and other devices can also be connected externally, such as LED warning lights, external speakers, etc.

[0050] In the present utility model, in order to provide a stable DC power supply to the processor MCU, the comparator U14 and the current detection amplifier U10, a first power chip U5 and a second power chip U3 are also included. The first power chip U5 is connected to the power supply unit 10, and the output end of the power chip is connected to the input end of the second power chip U3. The output end of the second power chip U3 is connected to the power supply end of the sampling unit 20, the comparator U14 and the processor MCU. The first power chip U5 can be RY8411, and the second power chip U3 can be AMS1117 series chips, as long as the voltage reduction can be achieved, that is, the voltage output by the output end of the power chip is lower than the voltage at the input end of the power chip. The voltage of the power supply unit 10 can be converted into the stable power supply voltage required by the sampling unit 20 and the comparator U14 by the first power chip U5 and the second power chip U3, so as to ensure the stable power supply of the processor MCU and the self-locking unit 50 and the sampling unit 20 safety protection circuit.

[0051] The utility model also provides an energy storage power supply, including a circuit with self-locking protection and release functions, wherein the circuit with self-locking protection and release functions is a circuit with self-locking protection and release functions as described in any one of the embodiments of the utility model. The energy storage power supply of the utility model realizes that the discharge end and the charging end are the same end, which simplifies the subsequent circuit connection. When the second N-type transistor Q36 is turned on in the energy storage power supply, the first N-type transistor Q37 needs to be driven to a low-level signal, which ensures the safety of the circuit and realizes safe charging and discharging control.

[0052] Preferably, the battery cell is a lithium battery, such as a lithium iron phosphate battery or a ternary lithium battery. The energy density of a lithium battery is relatively high, and it can provide a high amount of electricity in a small volume.

[0053] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. A circuit with self-locking protection and release function, characterized in that: It includes a power supply unit, a sampling unit, a self-locking unit, a switch unit and a load unit; The power supply unit is connected to the input end of the load unit; The input end of the sampling unit is connected between the input end of the power supply unit and the input end of the load unit, and the output end is connected to the input end of the self-locking unit; The self-locking unit includes a comparator, a reference voltage point and a self-locking diode, the reference voltage point is connected to the inverting input terminal of the comparator, the output terminal of the comparator is connected to the positive terminal of the self-locking diode and then connected to the non-inverting input terminal of the comparator, and the output terminal of the sampling unit is connected to the non-inverting input terminal of the comparator; The switch unit includes a first N-type transistor and a second N-type transistor, wherein the gate of the first N-type transistor is connected to the output end of the comparator, the source is grounded, and the drain is connected to the gate of the second N-type transistor; the source of the second N-type transistor is grounded, and the drain and the gate of the second N-type transistor are connected to the output end of the load unit.

2. A circuit with self-locking protection and release function according to claim 1, characterized in that: The sampling unit includes a current detection amplifier and a sampling resistor; The sampling resistor is connected between the power supply unit and the input end of the load unit; The in-phase input terminal and the inverting input terminal of the current detection amplifier are respectively connected to the two ends of the sampling resistor, and the output terminal of the current detection amplifier is connected to the input terminal of the self-locking unit.

3. A circuit with self-locking protection and release function according to claim 1, characterized in that: It also includes an unlocking unit, which includes a third N-type transistor and a sampling signal terminal, wherein the sampling signal terminal is connected to the gate of the third N-type transistor; the source of the third N-type transistor is grounded, and the drain is connected to the in-phase input terminal of the comparator.

4. A circuit with self-locking protection and release function according to claim 1, characterized in that: The reference voltage point is obtained by voltage division by a first voltage-dividing resistor and a second voltage-dividing resistor.

5. A circuit with self-locking protection and release function according to claim 3, characterized in that: It also includes a processor, and the sampling signal terminal is connected to the signal output terminal of the processor.

6. A circuit with self-locking protection and release function according to claim 5, characterized in that: The output end of the self-locking unit is connected to the signal input end of the processor.

7. A circuit with self-locking protection and release function according to claim 5, characterized in that: It also includes a first power chip and a second power chip, the first power chip is connected to the power supply unit, the output end of the power chip is connected to the input end of the second power chip, and the output end of the second power chip is connected to the power end of the sampling unit, the comparator and the processor.

8. A circuit with self-locking protection and release function according to claim 5, characterized in that: It also includes an LCD display screen, which is connected to the signal output end of the processor.

9. An energy storage power supply, characterized in that: It comprises a circuit with self-locking protection and release function, and the circuit with self-locking protection and release function is the circuit with self-locking protection and release function as claimed in any one of claims 1 to 8.

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