Self-locking circuit

Abstract

The application provides a self-locking circuit, which comprises a first switching element and a second switching element. A control end of the first switching element is used for obtaining a closing control signal; a control end of the second switching element is connected with a first connecting end of the first switching element; a first connecting end of the second switching element is used for connecting a power supply; and a second connecting end of the second switching element is connected with the control end of the first switching element. In this way, after the first switching element obtains the closing control signal, the first switching element and the second switching element can maintain a long-term closing state without the need of an external control signal for limiting. Based on the above structure, a specific normally open switch can be further controlled to maintain closing without a control signal, so that the design requirements of controller dormancy and reduction of energy consumption and / or cost are met, and the problems in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and in particular to a self-locking circuit. Background Technology

[0002] Since 2016, the China Electricity Council and State Grid Corporation of China, together with upstream and downstream enterprises in the domestic and international electric vehicle, power battery, charging equipment, and charging connector industries, have proposed the next-generation ChaoJi charging technology roadmap after years of research and investigation. This technology originates from the high-power charging needs of electric vehicles, but it does not simply refer to a high-power charging interface; rather, it is a complete DC charging system solution for electric vehicles. In this article, ChaoJi charging technology refers to the ChaoJi charging technology described in the "White Paper on ChaoJi Conductive Charging Technology for Electric Vehicles" published by State Grid Corporation of China.

[0003] ChaoJi technology addresses a series of shortcomings and problems existing in current international charging systems, providing the world with a unified, safe, reliable, and low-cost charging system solution. First, the ChaoJi charging system can provide high-power charging solutions, improving charging speed, enhancing user experience, and reducing range anxiety, particularly addressing the charging requirements of long-range vehicles, buses, commercial vehicles, special vehicles, and passenger cars in large cities and on highways. Second, in the early stages of industry development, four mainstream DC interface technologies emerged internationally: CHAdeMO, GB / T, CCS1, and CCS2. While each technology has its own characteristics and advantages, some technical problems and safety hazards have gradually emerged. The global electric vehicle industry urgently needs a unified, safe, and compatible charging interface. Third, with the increasing popularity of electric vehicles, users have placed higher demands on fast charging, charging safety, charging experience, and charging costs. Therefore, new technologies such as high-power charging, plug-and-charge, integrated charging and discharging, and low-power DC charging require a complete charging interface technology to support them. In the future, the ChaoJi charging system will become the mainstream vehicle charging system in my country.

[0004] However, the ChaoJi charging system has a technical challenge that urgently needs to be addressed. The ChaoJi charging system clearly defines the working scenario of scheduled charging, that is, after the charging gun is inserted, the car controller can enter a sleep state to save the power consumption of the whole machine. When the scheduled time arrives, a signal switch on the side of the charging pile will be closed.

[0005] The circuitry in the charging station works in conjunction with the charging signal receiving circuit on the vehicle. Generally, during the reservation phase, the controller is in a sleep state, all output signals are low, and all switches are in the open state. Therefore, no closed loop occurs in the charging signal receiving circuit. Even if the circuitry in the charging station changes, the voltage at any detection point in the charging signal receiving circuit remains unchanged. The controller inside the vehicle cannot determine whether the external circuitry has changed. In other words, no effective wake-up measurement point can be found in the charging signal receiving circuit to wake the controller from its sleep state. The controller cannot be woken up, and therefore, subsequent charging cannot proceed.

[0006] There are currently two existing solutions:

[0007] 1. Using a separate, constantly powered, low-performance processor dedicated to controlling a specific normally open switch to form a loop in the charging signal receiving circuit. When the vehicle is detected to be in a reserved phase, the switch is kept closed; otherwise, it is opened. Such a solution incurs additional processor purchase and setup costs.

[0008] 2. Keeping the MCU in working mode at all times to control the state of the switch, but this greatly increases the static power consumption of the controller.

[0009] However, neither of these two solutions is ideal. In summary, existing technologies have the problem that a specific normally open switch needs to be closed under certain operating conditions, but energy consumption and / or implementation costs must also be considered. Summary of the Invention

[0010] This invention provides a self-locking circuit to solve the problem in the prior art that a specific normally open switch needs to be closed under certain operating conditions, while energy consumption and / or implementation cost must also be considered.

[0011] To solve the above-mentioned technical problems, the present invention provides a self-locking circuit, which includes a first switching element and a second switching element.

[0012] The first switching element is configured such that when the control terminal of the first switching element is at a high level, the connection terminal of the first switching element closes the circuits on both sides; when the control terminal of the first switching element is at a low level, the connection terminal of the first switching element disconnects the circuits on both sides.

[0013] The second switching element is configured such that when the control terminal of the second switching element is at a low level, the connection terminal of the second switching element closes the circuits on both sides; and when the control terminal of the second switching element is at a high level, the connection terminal of the second switching element disconnects the circuits on both sides.

[0014] The control terminal of the first switching element is used to acquire a closing control signal; the first connection terminal of the first switching element is used to connect to a power source, and the second connection terminal of the first switching element is used to ground; the control terminal of the second switching element is connected to the first connection terminal of the first switching element, the first connection terminal of the second switching element is used to connect to a power source, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element.

[0015] Optionally, the self-locking circuit further includes a third switching element, the operating logic of which is the same as that of the first switching element.

[0016] The control terminal of the third switching element is used to obtain a disconnection control signal, the first connection terminal of the third switching element is connected to the second connection terminal of the second switching element, and the second connection terminal of the third switching element is used for grounding.

[0017] Optionally, the self-locking circuit further includes an execution switch element, the working logic of which is the same as that of the first switch element.

[0018] The control terminal of the actuator switch element is connected to the second connection terminal of the second switch element, and the connection terminal of the actuator switch element is used to connect to external components.

[0019] The self-locking circuit also includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor.

[0020] The control terminal of the first switching element is used to obtain the closing control signal through the first resistor, and the end of the first resistor connected to the first switching element is also used to be grounded through the fifth resistor; the first connection terminal of the first switching element is used to connect to the power supply through the second resistor.

[0021] The second connection terminal of the second switching element is connected to the first connection terminal of the third switching element through the ninth resistor, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element through the ninth resistor and the third resistor.

[0022] The control terminal of the third switching element is used to obtain the disconnection control signal through the fourth resistor; the second connection terminal of the third switching element is also connected to its own control terminal through the seventh resistor.

[0023] The second connection terminal of the second switching element is also connected to the control terminal of the actuating switching element through the eighth resistor, and the grounding connection terminal of the actuating switching element is also connected to its own control terminal through the sixth resistor.

[0024] Optionally, the self-locking circuit further includes a diode connected between the first resistor and the first switching element.

[0025] Optionally, the self-locking circuit further includes an execution switch element, the working logic of which is the same as that of the first switch element.

[0026] The control terminal of the actuator switch element is connected to the second connection terminal of the second switch element, and the connection terminal of the actuator switch element is used to connect to external components.

[0027] Optionally, the execution switching element is applied to the charging signal receiving circuit in ChaoJi mode.

[0028] Optionally, the charging signal receiving circuit includes a first working circuit and a second working circuit. The first working circuit is used to work in conjunction with the charging signal output circuit in ChaoJi mode, and the second working circuit is used to work in conjunction with the charging signal output circuit in non-ChaoJi mode. The execution switching element is used to switch the first working circuit on and off.

[0029] Optionally, the technical form of the non-ChaoJi mode charging signal output circuit includes at least one of CHAdeMO mode, GB / T mode, CCS1 mode, and CCS2 mode.

[0030] Optionally, the self-locking circuit operates in response to the control signal of the controller, and the charging signal receiving circuit operates at least in normal charging condition, power-off condition, and charging reservation condition; in the normal charging condition, the controller is in a wake-up state, and in the power-off condition and the charging reservation condition, the controller is in a sleep state.

[0031] Optionally, in the power outage condition, the actuating switch element is disconnected; in the charging reservation condition, the actuating switch element is closed.

[0032] Compared with the prior art, the self-locking circuit provided by the present invention includes a first switching element and a second switching element. The control terminal of the first switching element is used to acquire a closing control signal; the first connection terminal of the first switching element is used to connect to a power supply, and the second connection terminal of the first switching element is used to ground; the control terminal of the second switching element is connected to the first connection terminal of the first switching element, the first connection terminal of the second switching element is used to connect to a power supply, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element. With this configuration, after the first switching element acquires the closing control signal, both the first and second switching elements can remain in a long-term closed state without the need for external control signals. Based on this structure, it is possible to further control a specific normally open switch to remain closed without a control signal, meeting the design requirements of controller hibernation and reduced energy consumption and / or cost, and solving the problems existing in the prior art. Attached Figure Description

[0033] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention. Wherein:

[0034] Figure 1 This is a schematic diagram of a charging signal receiving circuit in ChaoJi mode according to an embodiment of the present invention;

[0035] Figure 2 This is a circuit diagram of an embodiment of the present invention.

[0036] In the attached image:

[0037] 10-Charging signal receiving circuit; 11-Vehicle side circuit; 12-Vehicle socket side circuit; 13-First working circuit; 14-Second working circuit; 15-Vehicle plug side circuit; 16-Charger side circuit; 20-ChaoJi mode charging signal output circuit 20. Detailed Implementation

[0038] To make the objectives, advantages, and features of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and may sometimes use different scales.

[0039] As used in this invention, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature. “One end” and “the other end,” as well as “proximal end” and “distal end,” generally refer to two corresponding parts, including not only endpoints. The terms “installed,” “connected,” and “joined” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Furthermore, as used in this invention, the phrase "one element is disposed on another element" generally only indicates that there is a connection, coupling, cooperation, or transmission relationship between the two elements, and the connection, coupling, cooperation, or transmission between the two elements can be direct or indirect through an intermediate element. It should not be construed as indicating or implying a spatial positional relationship between the two elements, i.e., one element can be located arbitrarily inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The core idea of ​​this invention is to provide a self-locking circuit to solve the problem in the prior art that a specific normally open switch needs to be closed under certain working conditions, but energy consumption and / or implementation cost must also be considered.

[0041] The following description refers to the accompanying drawings.

[0042] This invention provides a self-locking circuit, which is applied to the charging signal receiving circuit of ChaoJi mode. The specific form of the charging signal receiving circuit can be set according to or refer to the relevant technical requirements of ChaoJi mode. Figure 1 To understand.

[0043] Figure 1In the diagram, the circuit labeled 10 is the charging signal receiving circuit, which, for ease of understanding, is further divided into the vehicle-side circuit 11 and the vehicle socket-side circuit 12. The components and their intended uses represented by U1, R1, R1', S1, Rc, RE, D1, Rv', Rv, Sv', Sv, U2, R4, R4c, R4c', S2, and R4' in the diagram are not strongly related to this application and can be understood according to the "White Paper on Conductive Charging Technology for Electric Vehicles," and will not be elaborated upon here.

[0044] Of course, based on the ideas of this invention, the embodiments described can also be applied to other circuits with the same design requirements, and are not limited to charging signal receiving circuits in ChaoJi mode only.

[0045] The self-locking circuit operates in response to the controller's control signal, and the charging signal receiving circuit operates at least in normal charging condition, power-off condition, and charging reservation condition. In the normal charging condition, the controller is in a wake-up state; in the power-off condition and the charging reservation condition, the controller is in a sleep state. The desired operating result is: in the power-off condition, the switching element (in...) Figure 1 In the middle, it is marked with S2'. Figure 2 In the middle, marked with M3) it is disconnected; under the charging reservation condition, the execution switch element is closed.

[0046] To address the issue that a specific normally open switch needs to be closed when the controller is in sleep mode, the self-locking circuit includes a first switching element M1 and a second switching element M4.

[0047] The first switching element M1 is configured such that when its control terminal is high, its connection terminal closes the circuits on both sides; and when its control terminal is low, its connection terminal disconnects the circuits on both sides. The first switching element M1 can be, for example, an NMOS transistor.

[0048] The second switching element M4 is configured such that: when the control terminal of the second switching element M4 is at a low level, the connection terminal of the second switching element M4 closes the circuits on both sides; when the control terminal of the second switching element M4 is at a high level, the connection terminal of the second switching element M4 disconnects the circuits on both sides. The second switching element M4 can be, for example, a PMOS transistor.

[0049] The control terminal of the first switching element M1 is used to acquire a closing control signal (the closing control signal is that the S2'_LOCK port is high); the first connection terminal of the first switching element M1 is used to connect to the power supply, and the second connection terminal of the first switching element M1 is used to ground; the control terminal of the second switching element M4 is connected to the first connection terminal of the first switching element M1, the first connection terminal of the second switching element M4 is used to connect to the power supply Battery, and the second connection terminal of the second switching element M4 is connected to the control terminal of the first switching element M1.

[0050] With this configuration, initially, M1 and M4 are both in the open state. When M1 receives the closing control signal, both M1 and M4 close. M4 continuously provides a high level to the control terminal of M1 through the power supply battery. Even if the closing control signal disappears (i.e., the S2'_LOCK port is low), M1 and M4 remain closed, achieving a self-locking function. Based on this core structure, peripheral components can be configured accordingly to further control specific normally open switches to remain closed without a control signal. The controller can send the closing control signal before entering sleep mode and then enter sleep mode. This configuration meets the design requirements for controller sleep mode and reduced energy consumption and / or cost, solving problems existing in the prior art.

[0051] The unlocking method of the self-locking circuit can be set according to actual needs. Preferably, the self-locking circuit further includes a third switching element M2, the operating logic of which is the same as that of the first switching element M1. The third switching element M2 can be, for example, an NMOS transistor.

[0052] The control terminal of the third switching element M2 is used to obtain the disconnection control signal (the disconnection control signal is that the S2'_UNLOCK port is high level). The first connection terminal of the third switching element M2 is connected to the second connection terminal of the second switching element M4. The second connection terminal of the third switching element M2 is used for grounding.

[0053] When M1 and M4 are in the closed state, if the control terminal of M2 is at a high level, then M2 is closed. The voltage at the control terminal of M1 decreases because M2 is conducting, thus M1 is opened, and M4 is also opened, thereby realizing the unlocking function.

[0054] This configuration allows the controller to easily unlock the self-locking circuit after being woken up, in necessary situations, to enable other functions.

[0055] Furthermore, the self-locking circuit also includes an execution switch element M3, the operating logic of which is the same as that of the first switch element M1. The execution switch element M3 can be, for example, an NMOS transistor.

[0056] When M1, M2, M3, and M4 are MOSFETs, the specific circuit connection method can be based on common electrical knowledge or... Figure 2 The content will be understood, but will not be described in detail here.

[0057] The control terminal of the actuator switch element M3 is connected to the second connection terminal of the second switch element M4, and the connection terminal of the actuator switch element M3 is used to connect to external components.

[0058] The execution switch element M3 is the aforementioned specific normally open switch, and its specific open and closed state is the same as that of the second switch element M4. By switching its own open and closed state through the self-locking and unlocking of the self-locking circuit, the design expectation is achieved.

[0059] Please continue to refer to this. Figure 2 The self-locking circuit further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9.

[0060] The control terminal of the first switching element M1 is used to obtain the closing control signal through the first resistor R1, and the end of the first resistor R1 connected to the first switching element M1 is also used to be grounded through the fifth resistor R5; the first connection terminal of the first switching element M1 is used to connect to the power supply through the second resistor R2.

[0061] The second connection terminal of the second switching element M4 is connected to the first connection terminal of the third switching element M2 through the ninth resistor R9, and the second connection terminal of the second switching element M4 is connected to the control terminal of the first switching element M1 through the ninth resistor R9 and the third resistor R3.

[0062] The control terminal of the third switching element M2 is used to obtain the disconnection control signal through the fourth resistor R4; the second connection terminal of the third switching element M2 is also connected to its own control terminal through the seventh resistor R7.

[0063] The second connection terminal of the second switching element M4 is also connected to the control terminal of the actuating switching element M3 through the eighth resistor R8, and the grounding connection terminal of the actuating switching element M3 is also connected to its own control terminal through the sixth resistor R6.

[0064] The resistors described above are used to stabilize the circuit and prevent short circuits in some branches. In other embodiments, based on the operating characteristics of different components, some of the resistors may not be provided.

[0065] The self-locking circuit also includes a diode D0, which is connected between the first resistor R1 and the first switching element M1. The specific connection direction can be found in [reference needed]. Figure 2 This needs to be understood. The diode D0 is used to shield the signal interference between the two circuits.

[0066] As mentioned earlier, the execution switch element M3 is applied to the charging signal receiving circuit, which at least supports the ChaoJi mode technology. Figure 2 In the circuit diagram, D1, CC1, and R4' are all part of the charging signal receiving circuit and can be combined with... Figure 1 It should be understood that the specific functions of the above-mentioned components are not closely related to this application, and will not be described in detail here.

[0067] Preferably, the charging signal receiving circuit includes a first working circuit 13 and a second working circuit 14. The first working circuit 13 works in conjunction with the ChaoJi mode charging signal output circuit 20, which includes a vehicle plug-side circuit 15 and a charger-side circuit 16. The second working circuit 14 is used to work in conjunction with a non-ChaoJi mode charging signal output circuit. The actuating switch element M3 is used to switch the first working circuit 13 on and off. With this configuration, it can be used with the ChaoJi mode charging pile in the scheduled charging state, thereby fully realizing the scheduled charging process of the ChaoJi mode.

[0068] The non-ChaoJi mode charging signal output circuit includes at least one of CHAdeMO mode, GB / T mode, CCS1 mode, and CCS2 mode. The specific working principles and related standards of CHAdeMO mode, GB / T mode, CCS1 mode, and CCS2 mode can be understood by referring to common knowledge in the field, and will not be described in detail here. This configuration improves the applicability of the charging signal receiving circuit.

[0069] The charging signal receiving circuit of one embodiment of the present invention operates according to the following process.

[0070] Step 1: In the initial state, the MCU's output signals S2'_LOCK and S2'_UNCLOCK are both low, and M1, M2, M3 and M4 are all in the off state. At this time, it is equivalent to a specific normally open switch (i.e., M3) being turned on.

[0071] Step 2: When the controller receives the scheduled charging command, S2'_LOCK outputs high. At this time, the gate of M1 is at a high level, M1 is closed, which makes the gate of M4 go low, M4 is closed, and the voltage on the Battery reaches the gate of M3 through M4, R9 and R3, making the gate of M3 go high, M3 is closed, which is equivalent to the closing of a specific normally open switch.

[0072] Step 3: Then, the control is powered down and enters sleep mode. The output signals S2'_LOCK and S2'_UNCLOCK of the MCU are both low. However, the voltage on the Battery can still reach the gate of M1 through M4, R9 and R3, so that the gate of M1 is still at a high level. M1 is closed, realizing self-locking. It maintains the closed state of a specific normally open switch without relying on the output state of the MCU.

[0073] Step 4: When the scheduled time arrives, a signal switch on the charging pile side closes. Since M3 is in the closed state, a loop is formed. Therefore, the voltage at a specific detection point in the charging signal receiving circuit changes, causing the controller to enter the working mode and thus control the vehicle to charge. The specific logic of the voltage change at a specific detection point caused by the closing of the signal switch on the charging pile side is not closely related to this application and will not be described in detail here.

[0074] Step 5: After charging is complete, the output of S2'_UNCLOCK switches to high, the g terminal of M2 is high, M2 is closed, the low level is transmitted from M2 and R3 to the g terminal of M1, M1 is opened, making the g terminal of M4 high, M4 is opened, which in turn makes the g terminal of M3 low, M3 is opened (i.e., the specific normally open switch is opened).

[0075] Step 6: The S2'_UNCLOCK output switches low, M2's g signal is extremely low, M2 is disconnected, and the states of M1, M3, and M4 remain unchanged. At this time, the MCU's output signals S2'_LOCK and S2'_UNCLOCK are both low, and M1, M2, M3, and M4 are all in a cutoff state. The charging signal receiving circuit returns to its initial state before charging. It can now respond to new charging operation commands.

[0076] In summary, the self-locking circuit provided in this embodiment includes a first switching element and a second switching element. The control terminal of the first switching element is used to acquire a closing control signal; the first connection terminal of the first switching element is used to connect to a power supply, and the second connection terminal of the first switching element is used to ground; the control terminal of the second switching element is connected to the first connection terminal of the first switching element, the first connection terminal of the second switching element is used to connect to a power supply, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element. With this configuration, after the first switching element acquires the closing control signal, both the first and second switching elements can remain in a long-term closed state without requiring external control signals for restriction. Based on the above structure, it is possible to further control a specific normally open switch to remain closed without a control signal, meeting the design requirements of controller hibernation and reduced energy consumption and / or cost, and solving the problems existing in the prior art. This embodiment also has the advantages of simple structure, complete function, and low cost.

[0077] The above description is only a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A self-locking circuit, characterized by, The self-locking circuit includes a first switching element and a second switching element, wherein... The first switching element is configured such that when the control terminal of the first switching element is at a high level, the connection terminal of the first switching element closes the circuits on both sides; when the control terminal of the first switching element is at a low level, the connection terminal of the first switching element disconnects the circuits on both sides. The second switching element is configured such that when the control terminal of the second switching element is at a low level, the connection terminal of the second switching element closes the circuits on both sides; when the control terminal of the second switching element is at a high level, the connection terminal of the second switching element disconnects the circuits on both sides. The control terminal of the first switching element is used to acquire a closing control signal; the first connection terminal of the first switching element is used to connect to the power supply, and the second connection terminal of the first switching element is used to ground; the control terminal of the second switching element is connected to the first connection terminal of the first switching element, the first connection terminal of the second switching element is used to connect to the power supply, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element. The self-locking circuit further includes a third switching element, the operating logic of which is the same as that of the first switching element; wherein... The control terminal of the third switching element is used to obtain a disconnection control signal, the first connection terminal of the third switching element is connected to the second connection terminal of the second switching element, and the second connection terminal of the third switching element is used to ground. The self-locking circuit works in conjunction with the charging signal receiving circuit. The self-locking circuit responds to the control signal of the controller. The charging signal receiving circuit operates at least in normal charging condition, power-off condition, and charging reservation condition. Under normal charging condition, the controller is in a wake-up state. Under power-off condition and charging reservation condition, the controller is in a sleep state.

2. The self-latching circuit of claim 1, wherein, The self-locking circuit further includes an execution switch element, the operating logic of which is the same as that of the first switch element; wherein... The control terminal of the actuator switch element is connected to the second connection terminal of the second switch element, and the connection terminal of the actuator switch element is used to connect to external components. The self-locking circuit further includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; The control terminal of the first switching element is used to obtain the closing control signal through the first resistor, and the end of the first resistor connected to the first switching element is also used to be grounded through the fifth resistor; the first connection terminal of the first switching element is used to connect to the power supply through the second resistor. The second connection terminal of the second switching element is connected to the first connection terminal of the third switching element through the ninth resistor, and the second connection terminal of the second switching element is connected to the control terminal of the first switching element through the ninth resistor and the third resistor; The control terminal of the third switching element is used to obtain the disconnection control signal through the fourth resistor; the second connection terminal of the third switching element is also connected to its own control terminal through the seventh resistor; The second connection terminal of the second switching element is also connected to the control terminal of the actuating switching element through the eighth resistor, and the grounding connection terminal of the actuating switching element is also connected to its own control terminal through the sixth resistor.

3. The self-latching circuit of claim 2, wherein, The self-locking circuit also includes a diode connected between the first resistor and the first switching element.

4. The self-latching circuit of claim 1, wherein, The self-locking circuit further includes an execution switch element, the operating logic of which is the same as that of the first switch element; wherein... The control terminal of the actuator switch element is connected to the second connection terminal of the second switch element, and the connection terminal of the actuator switch element is used to connect to external components.

5. The self-latching circuit of claim 4, wherein, The execution switching element is applied to the charging signal receiving circuit in ChaoJi mode.

6. The self-latching circuit of claim 5, wherein, The charging signal receiving circuit includes a first working circuit and a second working circuit. The first working circuit is used to work in conjunction with the charging signal output circuit in ChaoJi mode, and the second working circuit is used to work in conjunction with the charging signal output circuit in non-ChaoJi mode. The execution switching element is used to switch the first working circuit on and off.

7. The self-latching circuit of claim 6, wherein, The technical form of the non-ChaoJi mode charging signal output circuit includes at least one of CHAdeMO mode, GB / T mode, CCS1 mode and CCS2 mode.

8. The self-latching circuit of claim 5, wherein, Under the power outage condition, the actuating switch element is open; under the charging reservation condition, the actuating switch element is closed.

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