A self-unlocking circuit for abnormal power failure of the electronic lock of the charging gun applied to the charging pile

Abstract

The invention discloses a circuit for automatically unlocking an electronic lock of a charging gun in the event of abnormal power failure, which is applied to a charging pile. The invention belongs to the technical field of electric vehicles and includes an AC / DC circuit, a DC / DC circuit, an MCU, a charging gun and an electronic lock driving circuit. The circuit solves the technical problem that a motor-type electronic lock automatically recovers to an initial state after an abnormal power failure. The invention is easy to use and can automatically unlock the electronic lock without monitoring a voltage change process through an MCU. The invention adopts a large-capacity capacitor, which has fast charging and a wide operating temperature range. The overall system design of the invention is simple, and no additional unlocking device is required. The circuit integrates power-off self-unlocking and electronic lock control, and has a low production cost. The electronic lock of the invention has high safety in self-recovery after power failure, a short capacitor charging time, a high response speed, a simple circuit structure, and is easy to produce.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicles and relates to a self-unlocking circuit for an electronic lock of a charging gun applied to a charging pile when power is abnormally lost. Background Art

[0002] With the popularization of new energy vehicles, the demand for charging piles is increasing, and the national standard charging gun has an electronic lock inside. Most national standard charging gun electronic locks are divided into electromagnetic electronic locks and motor electronic locks. The electromagnetic electronic lock uses an electromagnet to perform adsorption locking, while the motor electronic lock uses an internal motor to drive the movement of the lock plate, which is stuck on the lock tongue to achieve locking.

[0003] Electromagnetic electronic locks can restore to their initial state after abnormal power failure;

[0004] However, after an abnormal power outage, the motor-type electronic lock cannot restore the lock plate to its initial position in time, causing the electronic lock to remain in the current locked state and unable to automatically restore to the initial state. The user cannot unplug the charging gun head, which will cause a bad user experience. Summary of the invention

[0005] The purpose of the present invention is to provide a self-unlocking circuit for an electronic lock of a charging gun applied to a charging pile in the event of abnormal power failure, which solves the technical problem that a motor-type electronic lock automatically returns to an initial state after an abnormal power failure.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A self-unlocking circuit for abnormal power-off of the electronic lock of a charging gun applied to a charging pile, comprising an AC / DC circuit, a DC / DC circuit, an MCU, a charging gun and an electronic lock driving circuit, wherein the input end of the AC / DC circuit is connected to an external AC power supply, and the output end is powered by the input end of the DC / DC circuit, and the output end of the DC / DC circuit is powered by the MCU and the electronic lock driving module;

[0008] The output end of the DC / DC circuit is connected to the input end of the charging gun, and the output end of the charging gun charges the electric vehicle;

[0009] The MCU controls the on / off of the connection circuit between the DC / DC circuit and the charging gun;

[0010] The voltage input terminal of the electronic lock driving circuit for controlling the automatic unlocking of the internal motor of the charging gun is connected to the input terminal 12VIN of the charging gun, and the positive output terminal OUT+ and the negative output terminal OUT- are both connected to the internal motor of the charging gun.

[0011] Preferably, the DC / DC circuit is connected to the charging gun via a relay or a thyristor, and the MCU controls the on and off of the relay or the thyristor via an IO port.

[0012] Preferably, the AC / DC circuit is an AC-to-DC module, and the DC / DC circuit is a DC-to-DC module.

[0013] Preferably, the electronic lock drive circuit includes a relay K1, a diode D1, a diode D2, a diode D3, a capacitor C1 and a capacitor C2, the common end of the relay K1 is provided with an output end, i.e., a common end output end, the normally closed end of the relay K1 is connected to the ground wire, the normally open end is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the supply voltage, the anode of the diode D2 is the input end 12VI N, and the supply voltage is provided by the output end of the DC / DC circuit;

[0014] One end of the coil of relay K1 is connected to the cathode of diode D2, and the other end is connected to the ground wire. Diode D3 is connected in parallel to the coil of relay K1 as a freewheeling diode on the coil of relay K1.

[0015] The common output terminal is connected to the positive electrode of the capacitor C1 and the positive electrode of the capacitor C2 respectively, and the negative electrode of the capacitor C1 and the negative electrode of the capacitor C2 are connected together to form the positive output terminal OUT+;

[0016] The normally closed terminal of the relay K1 constitutes the negative output terminal OUT-.

[0017] Preferably, the supply voltage is 12V, 5V or 24V.

[0018] Preferably, the capacitance of the capacitor C1 and the capacitor C2 are both 10000uf, and the withstand voltage is 16V.

[0019] Preferably, the external AC power supply is a 220VAC mains power supply.

[0020] The invention discloses a circuit for automatically unlocking an electronic lock of a charging gun when it is abnormally powered off, which is applied to a charging pile. The circuit solves the technical problem that a motor-type electronic lock automatically recovers to an initial state after an abnormal power failure. The invention is easy to use and can automatically unlock the electronic lock without the need to monitor the voltage change process through an MCU. The invention adopts a large-capacity capacitor, which has fast charging and a wide operating temperature range. The overall system design of the invention is simple, and no additional unlocking device is required. The circuit integrates power-off self-unlocking and electronic lock control, and has a low production cost. The electronic lock of the invention has high safety in self-recovery when it is powered off, short capacitor charging time, high response speed, simple circuit structure, and is easy to produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic block diagram of the present invention;

[0022] Figure 2 A circuit diagram of an electronic lock driving circuit of the present invention;

[0023] Figure 3 This is a timing diagram of the electronic lock driving circuit of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 3 The circuit shown is a self-unlocking circuit for abnormal power-off of the electronic lock of the charging gun applied to the charging pile, including an AC / DC circuit, a DC / DC circuit, an MCU, a charging gun and an electronic lock driving circuit. The input end of the AC / DC circuit is connected to an external AC power supply, and the output end is powered by the input end of the DC / DC circuit. The output end of the DC / DC circuit is powered by the MCU and the electronic lock driving module.

[0026] The output end of the DC / DC circuit is connected to the input end of the charging gun, and the output end of the charging gun charges the electric vehicle;

[0027] The MCU controls the on / off of the connection circuit between the DC / DC circuit and the charging gun;

[0028] The voltage input terminal of the electronic lock driving circuit for controlling the automatic unlocking of the internal motor of the charging gun is connected to the input terminal 12VIN of the charging gun, and the positive output terminal OUT+ and the negative output terminal OUT- are both connected to the internal motor of the charging gun.

[0029] Preferably, the DC / DC circuit is connected to the charging gun via a relay or a thyristor, and the MCU controls the on and off of the relay or the thyristor via an IO port.

[0030] Preferably, the AC / DC circuit is an AC-to-DC module, and the DC / DC circuit is a DC-to-DC module.

[0031] Preferably, the electronic lock drive circuit includes a relay K1, a diode D1, a diode D2, a diode D3, a capacitor C1 and a capacitor C2, the common end of the relay K1 is provided with an output end, i.e., a common end output end, the normally closed end of the relay K1 is connected to the ground wire, the normally open end is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the supply voltage, the anode of the diode D2 is the input end 12VI N, and the supply voltage is provided by the output end of the DC / DC circuit;

[0032] One end of the coil of relay K1 is connected to the cathode of diode D2, and the other end is connected to the ground wire. Diode D3 is connected in parallel to the coil of relay K1 as a freewheeling diode on the coil of relay K1.

[0033] The common output terminal is connected to the positive electrode of the capacitor C1 and the positive electrode of the capacitor C2 respectively, and the negative electrode of the capacitor C1 and the negative electrode of the capacitor C2 are connected together to form the positive output terminal OUT+;

[0034] The normally closed terminal of the relay K1 constitutes the negative output terminal OUT-.

[0035] like Figure 2 As shown, the relay K1 is provided with pin 1, pin 2, pin 3, pin 4, pin 5 and pin 6, wherein pin 1 is a normally open end connected to the cathode of the diode D1, pin 2 is one end of the coil connected to the cathode of the diode D2, pins 3 and 4 are connected together and connected to the common end of the relay K1, pins 3 and 4 are connected to the anode of the capacitor C1 and the cathode of the capacitor C2 respectively, pin 5 is the other end of the coil connected to the ground wire, pin 6 is a normally closed end connected to the ground wire, the anode of the freewheeling diode D3 is connected to pin 5, and the cathode is connected to pin 2;

[0036] In this embodiment, the sum of the voltage drops of the diodes D1 and D2 is 0.7V, the voltage input to the input terminal 12VI N is 12V, and after being stepped down by the diodes D1 and D2, the voltage reaching the relay is 12V-0.7V=11.3V.

[0037] In this embodiment, the charging current of capacitor C1 and capacitor C2 is calculated by the capacitor current calculation formula: I=C×du / dt, where C is the capacitance, I is the current, du is the differential value of the voltage value loaded on the capacitor, and dt is the differential value of time. The capacitor current calculation formula is a prior art and is not described in detail.

[0038] In this embodiment, when calculating the discharge current of capacitors C1 and C2, it is necessary to calculate the current and time according to the impedance of the internal motor of the charging gun, and the maximum current of the Schottky diode and the relay needs to be considered in the calculation. In this embodiment, diodes D1 and D2 are both Schottky diodes.

[0039] When in use, it is divided into two states: power-on and power-off. When the charging gun is connected to the electric vehicle and charges the electric vehicle, it is in the power-on state. At this time, the MCU controls the DC / DC circuit to power the charging gun, and the charging gun charges the electric vehicle. At this time, the electronic lock drive circuit of the present invention detects the input end of the charging gun, that is, the 12V power supply provided by the DC / DC circuit will also be loaded on the input end 12VIN. At this time, the 12V power supply supplies power to the coil of the relay K1 through the diode D2, so that the relay is activated, and its normally open end is closed, so that the 12V power supply can be loaded on the 3rd and 4th pins of the relay K1 through the diode D1 and the diode D2, thereby charging the capacitor C1 and the capacitor C2. At this time, the positive output terminal OUT+ outputs a positive 11.3V voltage, and the negative output terminal OUT- outputs a 0V voltage. The voltage output by the positive output terminal OUT+ and the negative output terminal OUT- is loaded on the internal motor of the charging gun, thereby causing the motor to operate and realizing automatic locking of the charging gun.

[0040] When the charging gun is connected to the electric vehicle but the charging of the electric vehicle is disconnected, it is in the power-off state. At this time, whether the MCU controls the DC / DC circuit to disconnect the power supply to the charging gun, or the power supply of the charging gun is disconnected due to an emergency (such as a power outage), the electronic lock driving circuit of the present invention will detect that the 12V voltage at the input end of the charging gun becomes 0V. At this time, the voltage on the input end 12VIN is 0V, and the coil of the relay K1 cannot obtain the driving voltage, thereby returning to the original state, that is, the normally open end is disconnected. At this time, the capacitor C1 and the capacitor C2 will not undergo a sudden voltage change, and the voltage will be maintained for a certain period of time and applied to the common end of the relay K1. At this time, the normally closed end of the relay K1 will be loaded with this voltage, so that the positive output end OUT+ outputs a negative 11.3V voltage, and the negative output end OUT- outputs a 0V voltage. This voltage will restore the internal motor of the charging gun to its original position, thereby realizing automatic unlocking after power failure.

[0041] like Figure 3 This is the timing diagram of the electronic lock drive circuit. The MCU is used to control the on and off of the 12V voltage in the circuit; when the voltage input is 12V, the capacitor is charged and the voltage is output at the same time; when the 12V is disconnected, the relay switches to discharge the capacitors C1 and C2.

[0042] Preferably, the supply voltage is 12V, 5V or 24V.

[0043] Preferably, the capacitance of the capacitor C1 and the capacitor C2 are both 10000uf, and the withstand voltage is 16V.

[0044] Preferably, the external AC power supply is a 220VAC mains power supply.

[0045] The invention discloses a circuit for automatically unlocking an electronic lock of a charging gun when it is abnormally powered off, which is applied to a charging pile. The circuit solves the technical problem that a motor-type electronic lock automatically recovers to an initial state after an abnormal power failure. The invention is easy to use and can automatically unlock the electronic lock without the need to monitor the voltage change process through an MCU. The invention adopts a large-capacity capacitor, which has fast charging and a wide operating temperature range. The overall system design of the invention is simple, and no additional unlocking device is required. The circuit integrates power-off self-unlocking and electronic lock control, and has a low production cost. The electronic lock of the invention has high safety in self-recovery when it is powered off, short capacitor charging time, high response speed, simple circuit structure, and is easy to produce.

[0046] In the present invention, any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code including one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0047] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0048] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0049] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0050] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A self-unlocking circuit for abnormal power failure of the electronic lock of a charging gun applied to a charging pile, characterized by: It includes an AC / DC circuit, a DC / DC circuit, an MCU, a charging gun and an electronic lock drive circuit. The input end of the AC / DC circuit is connected to an external AC power supply, and the output end is powered by the input end of the DC / DC circuit. The output end of the DC / DC circuit is powered by the MCU and the electronic lock drive module. The output end of the DC / DC circuit is connected to the input end of the charging gun, and the output end of the charging gun charges the electric vehicle; The MCU controls the on / off of the connection circuit between the DC / DC circuit and the charging gun; The voltage input terminal of the electronic lock driving circuit for controlling the automatic unlocking of the internal motor of the charging gun is connected to the input terminal 12VIN of the charging gun, and the positive output terminal OUT+ and the negative output terminal OUT- are both connected to the internal motor of the charging gun; The DC / DC circuit is connected to the charging gun via a relay or a thyristor, and the MCU controls the on and off of the relay or the thyristor via an IO port; The electronic lock driving circuit includes a relay K1, a diode D1, a diode D2, a diode D3, a capacitor C1 and a capacitor C2. The common end of the relay K1 is provided with an output end, namely, a common end output end. The normally closed end of the relay K1 is connected to the ground wire, and the normally open end is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the cathode of the diode D2. The anode of the diode D2 is connected to the power supply voltage. The anode of the diode D2 is the input end 12VIN. The power supply voltage is provided by the output end of the DC / DC circuit. One end of the coil of relay K1 is connected to the cathode of diode D2, and the other end is connected to the ground wire. Diode D3 is connected in parallel to the coil of relay K1 as a freewheeling diode on the coil of relay K1. The common output terminal is connected to the positive electrode of the capacitor C1 and the positive electrode of the capacitor C2 respectively, and the negative electrode of the capacitor C1 and the negative electrode of the capacitor C2 are connected together to form the positive output terminal OUT+; The normally closed terminal of relay K1 constitutes the negative output terminal OUT-; When in use, it is divided into two states: power-on and power-off. When the charging gun is connected to the electric vehicle and charges the electric vehicle, it is in the power-on state. At this time, the MCU controls the DC / DC circuit to power the charging gun, and the charging gun charges the electric vehicle. At this time, the electronic lock drive circuit detects the input end of the charging gun, that is, the 12V power supply provided by the DC / DC circuit will also be loaded on the input end 12VIN. At this time, the 12V power supply supplies power to the coil of the relay K1 through the diode D2, so that the relay is activated, and its normally open end is closed, so that the 12V power supply can be loaded on the 3rd and 4th pins of the relay K1 through the diode D1 and the diode D2, thereby charging the capacitor C1 and the capacitor C2. At this time, the positive output terminal OUT+ outputs a positive 11.3V voltage, and the negative output terminal OUT- outputs a 0V voltage. The voltage output by the positive output terminal OUT+ and the negative output terminal OUT- is loaded on the internal motor of the charging gun, so that the motor is activated to achieve automatic locking of the charging gun; When the charging gun is connected to the electric vehicle but the charging is disconnected, it is in the power-off state. At this time, whether the MCU controls the DC / DC circuit to disconnect the power supply to the charging gun, or the power supply of the charging gun is disconnected due to an emergency, the electronic lock drive circuit will detect that the 12V voltage at the input end of the charging gun has become 0V. At this time, the voltage on the input end 12VIN is 0V, and the coil of relay K1 cannot get the driving voltage, so it returns to the original state, that is, the normally open end is disconnected. At this time, capacitors C1 and C2 will not undergo a sudden voltage change, and the voltage will be maintained for a certain period of time and applied to the common end of relay K1. At this time, the normally closed end of relay K1 will be loaded with this voltage, so that the positive output end OUT+ outputs a negative 11.3V voltage, and the negative output end OUT- outputs a 0V voltage. This voltage will restore the internal motor of the charging gun to its original position, and then automatically unlock after power failure.

2. A self-unlocking circuit for an electronic lock of a charging gun in a charging pile when power is abnormally lost as described in claim 1, characterized in that: The AC / DC circuit is an AC-to-DC module, and the DC / DC circuit is a DC-to-DC module.

3. A self-unlocking circuit for an electronic lock of a charging gun in a charging pile when power is off abnormally as claimed in claim 1, characterized in that: The capacitance of the capacitor C1 and the capacitor C2 are both 10000uf, and the withstand voltage is 16V.

4. A self-unlocking circuit for an electronic lock of a charging gun applied to a charging pile when power is abnormally lost as claimed in claim 1, characterized in that: The external AC power supply is a 220VAC mains power supply.

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