Charging gun control device

Abstract

The utility model belongs to the technical field of charging gun control, and particularly relates to a charging gun control device. Comprising a charging gun electronic lock control module, the charging gun electronic lock control module comprises a locking loop, a primary unlocking loop and a secondary unlocking loop, the three loops are all provided with output terminals used for being connected with an electronic lock interface, and one of the three loops is selected to be conducted; the locking loop is used for realizing locking of the electronic lock, the primary unlocking loop is used for realizing primary unlocking of the electronic lock, and a normally-closed contact and a common contact of the first relay are connected in series on the locking loop and the primary unlocking loop; a normally open contact and a common contact of the first relay are connected in series on the secondary unlocking loop; the main control module is used for enabling the state of the first relay to change when the primary unlocking loop is in the on state, so that the primary unlocking loop is switched to be in the off state, the secondary unlocking loop is switched to be in the on state, secondary unlocking of the electronic lock is achieved, and the situation that the charging gun cannot be unlocked due to the fact that the primary unlocking loop refuses to move is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of charging gun control, and in particular relates to a charging gun control device. Background Art

[0002] With the continuous improvement of electric vehicle battery capacity and the continuous improvement of three-electric technology, the production and sales of electric vehicles have grown by leaps and bounds. Correspondingly, the demand for electric vehicle chargers is also increasing, and the power of DC chargers is also increasing. The current related technologies have the following problems: 1) The electronic lock needs to be locked when the charging gun is inserted into the socket, and the temperature of the charging gun head needs to be detected in real time during the charging process. The temperature detection device and electronic lock control device of the existing charger charging gun are two independent devices, which interact with the DC charging control unit respectively, and finally the charging controller sends relevant control information. 2) When the charging current is large, the existing temperature detection device is easily interfered, which causes the sampled temperature to deviate too much from the actual value, triggering the DC charging control unit failure, resulting in a poor charging experience. 3) Most of the existing unlocking circuits only have a one-time unlocking function, such as the Chinese utility model patent with authorization announcement number CN219458196U. In this patent, the normally closed contacts of the monostable relay are used to be connected in series with the energy storage module and the DC motor to form an unlocking circuit, that is, the energy storage module is discharged through the unlocking circuit, and the discharge current flows from the negative terminal of the DC motor to the positive terminal of the DC motor, causing the DC motor to reverse and complete the unlocking action. In other words, the on and off of the unlocking circuit is realized by the monostable relay. When the monostable relay fails to operate, the charging gun cannot be unlocked. Utility Model Content

[0003] The utility model aims to provide a charging gun control device, so as to solve the problem in the prior art that the charging gun cannot be unlocked due to a relay failure.

[0004] In order to solve the above technical problems, the utility model provides a charging gun control device, including a main control module, a power supply module and a charging gun electronic lock control module, the power supply module is used to power the control device, the charging gun electronic lock control module includes a locking circuit, a primary unlocking circuit and a secondary unlocking circuit, the three circuits are provided with an output terminal for connecting the electronic lock interface, and one of the three circuits is turned on; the locking circuit is used to realize the locking of the electronic lock, the primary unlocking circuit is used to realize the primary unlocking of the electronic lock, and the locking circuit and the primary unlocking circuit are both serially provided with a normally closed contact and a common contact of a first relay; the secondary unlocking circuit is serially provided with a normally open contact and a common contact of the first relay; the main control module is used to change the state of the first relay when the primary unlocking circuit is in the on state, so that the primary unlocking circuit is switched to the off state and the secondary unlocking circuit is switched to the on state, so as to realize the secondary unlocking of the electronic lock.

[0005] Furthermore, energy storage units are serially connected on both the locking circuit and the primary unlocking circuit. When the locking circuit is in an on state, the energy storage unit is in a charging state. When the primary unlocking circuit is in an on state, the energy storage unit is in a discharging state.

[0006] Furthermore, a first normally open contact and a first common contact of a second relay are connected in series on the locking circuit, and a first normally closed contact and a first common contact of the second relay are connected in series on the unlocking circuit.

[0007] Furthermore, a first diode is connected in parallel at both ends of the first relay coil, and an anode of the first diode is connected to a cathode of the first relay coil.

[0008] Furthermore, two ends of the second relay coil are connected in parallel with a second diode and a first absorption capacitor which are arranged in parallel, and an anode of the second diode is connected to a cathode of the second relay coil.

[0009] Furthermore, a clamping diode and a second absorption capacitor which are arranged in parallel are connected in parallel at both ends of the output terminal.

[0010] Furthermore, the second normally open contact of the second relay is grounded, the second normally closed contact of the second relay is suspended, the second common contact of the second relay is connected to the power supply through a pull-up resistor, and the second common contact of the second relay is also connected to the main control module so that the main control module knows whether the unlocking loop is in an on state.

[0011] Furthermore, the control device also includes a temperature sampling module, which includes a voltage divider branch, which is used to connect the gun tip resistor and the internal resistor in series, and the voltage dividing point of the gun tip resistor and the internal resistor is connected to the non-inverting input of the comparator, the inverting input of the comparator is connected to the reference voltage, the output of the comparator is connected to the non-inverting input of the voltage follower, and the output of the voltage follower is connected to the main control module.

[0012] Furthermore, the temperature sampling module also includes a filtering module, and the gun tip resistor is connected in series on the voltage divider branch through the filtering module, and the filtering module includes a magnetic bead and a common mode inductor filtering unit.

[0013] Furthermore, the power module includes a second-order filtering unit, and the second-order filtering unit is used to perform second-order filtering on the input voltage.

[0014] The beneficial effects of the utility model are as follows: the utility model is an improved invention, and for the charging gun electronic lock control module, in addition to a locking circuit and a primary unlocking circuit, a secondary unlocking circuit for realizing secondary unlocking is also provided, and the three circuits are in a state of selectively being turned on, and the interlocking of the secondary unlocking circuit and the remaining two circuits is realized by the first relay, and its specific working method is that when it is in the primary unlocking state (that is, the primary unlocking circuit is in the on state), the main control module changes the state of the first relay, and the change causes the primary unlocking circuit to switch from the on state to the off state, and causes the secondary unlocking circuit to switch from the off state to the on state, and the electronic lock is unlocked for the second time through the secondary unlocking circuit, which can avoid the situation where the charging gun cannot be unlocked due to the refusal of the primary unlocking circuit to move, thereby improving the user's charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an application system diagram of the charging gun control device of the utility model;

[0016] Figure 2 This is a design principle block diagram of the charging gun control device of the utility model;

[0017] Figure 3-1 It is a circuit diagram of the first part of the power module in the charging gun control device of the utility model;

[0018] Figure 3-2 It is a circuit diagram of the second part of the power module in the charging gun control device of the utility model;

[0019] Figure 3-3 It is a circuit diagram of the third part of the power module in the charging gun control device of the utility model;

[0020] Figure 4-1 It is a circuit diagram of the first part of the charging gun electronic lock control module in the charging gun control device of the utility model;

[0021] Figure 4-2 It is a circuit diagram of the second part of the charging gun electronic lock control module in the charging gun control device of the utility model;

[0022] Figure 4-3 It is a circuit diagram of the third part of the charging gun electronic lock control module in the charging gun control device of the utility model;

[0023] Figure 5-1 It is a circuit diagram of the first part of the temperature sampling module in the charging gun control device of the utility model;

[0024] Figure 5-2 It is a circuit diagram of the second part of the temperature sampling module in the charging gun control device of the utility model;

[0025] Figure 5-3 It is a circuit diagram of the third part of the temperature sampling module in the charging gun control device of the utility model. DETAILED DESCRIPTION

[0026] The charging gun control device of the utility model comprises a charging gun electronic lock control module, which comprises a locking circuit for realizing electronic lock locking, a primary unlocking circuit for realizing primary unlocking of the electronic lock and a secondary unlocking circuit for realizing secondary unlocking of the electronic lock, and the three circuits are in a selectively conductive state; the normally closed contact and the common contact of the first relay are serially arranged on the locking circuit and the primary unlocking circuit, and the normally open contact and the common contact of the first relay are serially arranged on the secondary unlocking circuit, so as to realize the interlocking of the secondary unlocking circuit with the other two circuits; the working mode of the secondary unlocking circuit is that when the primary unlocking circuit is in a conductive state, the state of the first relay changes, so that the primary unlocking circuit is switched to a disconnected state and the secondary unlocking circuit is switched to a conductive state, so as to realize secondary unlocking of the electronic lock and avoid the situation that the charging gun cannot be unlocked due to the refusal of the primary unlocking circuit to move.

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The charging gun control device of the utility model is as follows: Figure 1 As shown, it is arranged between the DC charging control unit and the charging gun. The device integrates the temperature sampling module and the charging gun electronic lock control module into one device. The device collects the temperature of the charging gun through the temperature sampling module, and sends the collected data to the DC charging control unit through the communication module. The DC charging control unit integrates the information obtained to control the output power. The power supply of the charging gun electronic lock control module of the device is controlled by the DC charging control unit. After the charging gun is plugged in, the DC charging control unit controls the output to supply power to the charging gun electronic lock control module. The charging gun electronic lock control module outputs a positive pulse to control the electronic lock of the charging gun to lock. When charging is finished, the DC charging control unit controls the output to cut off the power to the electronic lock circuit, and the charging gun electronic lock control module outputs a negative pulse to control the electronic lock of the charging gun to unlock. The device integrates the charging gun electronic lock control module and the temperature sampling module into one device, and optimizes the circuit design of the power module, the charging gun electronic lock control module and the temperature sampling module at the same time. It has the advantages of simple system wiring, strong anti-interference ability, and economical and practical.

[0029] The specific design principle block diagram of the device is as follows Figure 2 As shown, it includes five parts: main control module, power module, charging gun electronic lock control module, temperature sampling module and communication module.

[0030] The main control module can select MCU and be connected with the communication module to realize the communication between MCU and the DC charging control unit.

[0031] The power module is used to supply power to the control device, and mainly includes a second-order filter unit and a level conversion unit. Its circuit is as follows Figure 3-1 to Figure 3-3 shown. Figure 3-1 It is used to output +12V2 voltage after second-order filtering of the input +12V1 voltage. The second-order filtering includes C46, ​​C47 and L21 in Figure 3, where L21 is a common-mode filtering inductor. The second-order filtering unit can effectively filter out the common-mode interference on the power supply side. The level conversion unit includes chip U11 and chip U12. Figure 3-2 As shown, the voltage of +12V1 is converted to +5V voltage by chip U11, where D26 connected in series between +12V1 and chip U11 is an anti-reverse diode, L18 is a magnetic bead, C28 set between the input end of chip U11 and the ground is a voltage stabilizing capacitor, C29 and C30 are filter capacitors, C31 and C32 between the output end of chip U11 and the ground are filter capacitors, and C33 is a voltage stabilizing capacitor. Figure 3-3 As shown, the +5V voltage is converted to +3.3V voltage by chip U12, wherein the capacitor C36 arranged between chip U12 and ground is a filter capacitor, and C158 is a voltage stabilizing capacitor. Through the specific design of this circuit, it is possible to provide +12V1, +12V2, +5V, +3.3V voltages for the entire control device.

[0032] The charging gun electronic lock control module is used to realize the locking, primary unlocking and secondary unlocking of the electronic lock. Figure 4-1 to Figure 4-3 As shown, it mainly includes a first relay U13, a second relay U15 and an energy storage unit (specifically, an energy storage capacitor C39). Figure 4-2As shown, the coil of the first relay U13 is connected in series on the coil power supply branch between +12V and ground, and the coil power supply branch is connected in series with an anti-reverse diode D7 and a MOS tube Q1, and a diode D8 for suppressing coil voltage glitches is connected in parallel at both ends of the coil (the anode of D8 is connected to the negative electrode of the coil), and the gate of the MOS tube Q1 is connected to the main control module MCU through the interface C_LOCK_EN connected to the resistor R43. The main control module MCU controls Q1 to be turned on so that the coil of the first relay U13 is energized, and the two normally open contacts 5 and 8 (LOCK2B and LOCK2A respectively) are connected to +12V1 and ground respectively, the two common contacts are 4 and 9 (LOCKB and LOCKA respectively), and the two normally closed contacts are 3 and 10 (LOCK1B and LOCK1A respectively). The coil of the second relay U15 is connected in series on the coil power supply branch between +12V2 and LOCK1B, and an anti-reverse diode D10 is connected in series on the coil power supply branch. A diode D12 and an absorption capacitor C43 (D12 and C43 are connected in parallel) are connected in parallel at both ends of the coil to suppress coil voltage glitches. The first normally closed contact 10 of the second relay U15 is connected to LOCK1B, the first common contact 9 is connected to LOCK1A through a storage capacitor C39, the first normally open contact 8 is connected to +12V2 through an anti-reverse diode D14, and +12V2 is grounded through a capacitor C37. The second normally closed contact 3 of the second relay U15 is suspended, the second common contact 4 is connected to +3.3V through a pull-up resistor R103, and the second common contact 4 is also connected to the MCU through the interface STATE_DI, and the second normally open contact is grounded. Moreover, as Figure 4-1 As shown, a clamping diode D27 and an absorption capacitor C48 are connected in parallel at both ends of the output terminals LOCKA and LOCKB.

[0033] Figure 4-1 to Figure 4-3The specific working principle is: after the second relay U15 is started, the first common contact 9 of the second relay U15 is connected to the first normally open contact 8, the second common contact 4 is connected to the second normally open contact 5, +12V2 outputs voltage to the energy storage capacitor C39 to charge it, and the first relay U13 connects LOCKA and LOCK1A, and LOCKB and LOCK1B, so that the energy storage capacitor C39 can output a positive pulse signal to the output terminal, which is equivalent to the state where LOCKA is positive and LOCKB is negative. When the locking circuit of the pulse electronic lock receives the positive pulse signal through the output terminal, the pulse electronic lock is in a locked state. After the coil of the second relay U15 is not energized, the second relay U15 is restored to the connection between the first common contact 9 and the first normally closed contact 10, the second common contact 4 and the second normally closed contact 3, the first relay U13 still maintains the connection between LOCKA and LOCK1A, LOCKB and LOCK1B, the energy storage capacitor C39 discharges, and outputs a reverse pulse signal to the output terminal, which is equivalent to the state where LOCKA is negative and LOCKB is positive. When the pulse electronic lock receives the reverse pulse signal, the pulse electronic lock is in an unlocked state, which is a one-time unlocking. During this process, a high-level signal is sent to the MCU through STATE_DI to let the MCU know that it is in a one-time unlocking state. At this time, after one unlocking, the MCU controls Q1 to close, the coil of the first relay U13 is energized, and the common contacts of the first relay U13 are all connected to the corresponding normally open contacts, which is equivalent to the state where LOCKA is negative and LOCKB is positive. The first relay U13 outputs a reverse pulse signal to the output terminal to unlock the electronic lock, which is a second unlocking. The second unlocking can avoid the situation where the charging gun cannot be unlocked due to the refusal of the first unlocking circuit.

[0034] That is, through the above circuit, +12V2, anti-reverse diode D14, the first normally open contact 8 of the second relay U15, the first common contact 9, energy storage capacitor C39, the two normally closed contacts of the first relay U13 and the circuit where the two common contacts are located constitute a locking circuit for realizing electronic lock locking; energy storage capacitor C39, the first common contact 9 of the second relay U15, the first normally closed contact 10, the two normally closed contacts of the first relay U13 and the circuit where the two common contacts are located constitute a primary unlocking circuit for realizing one-time unlocking of the electronic lock; +12V1, the two normally open contacts of the first relay U13 and the circuit where the two common contacts are located constitute a secondary unlocking circuit for realizing secondary unlocking of the electronic lock. The three circuits are in a state of selectively conducting.

[0035] The circuit of the temperature sampling module is as follows Figure 5-1 , Figure 5-2 and Figure 5-3As shown in the figure, the input terminal is used to collect the resistance value of the charging gun tip. The DC charging gun tip has two built-in PT1000 resistors (hereinafter referred to as gun tip resistors). The resistance value of this resistor increases linearly with temperature. Figure 5-2 As shown, the gun tip resistor 1 (connected between PTC1 and PTC2 through a connecting line) and the precision resistor R106 inside the device are connected in series, and powered by the reference voltage Vref1. After the gun tip resistor 1 and R106 are divided, the voltage on the resistor R106 is subtracted from the reference voltage Vref2 by the comparator U4A to obtain the first sampling voltage U1. U1 is passed through the circuit follower U4B to obtain the sampling voltage U2. The sampling voltage U2 is sent to the MCU through ADC_T1 for processing to obtain the temperature value of the contact point. Figure 5-2 In the example, D51 is a clamping diode. Figure 5-3 As shown, the gun tip resistor 2 (connected between PTC3 and PTC4 through a connecting line) is connected in series with the precision resistor R205 inside the device, and is powered by the reference voltage Vref1. After the gun tip resistor 2 and R205 are divided, the voltage on the resistor R205 is subtracted from the reference voltage Vref2 by the comparator U5A to obtain the first sampling voltage U1'. U1' is passed through the circuit follower U5B to obtain the sampling voltage U2'. The sampling voltage U2' is sent to the MCU through ADC_T2 for processing to obtain the temperature value of the contact point. Figure 5-3 In the example, D52 is a clamping diode. Also, Figure 5-1 Adding magnetic beads L5~L8 and common-mode inductor filters L22~L23 at the middle input terminal can effectively suppress the common-mode interference introduced by the gun line and ensure the accuracy of the sampled temperature.

[0036] Specific implementations are given above, but the present invention is not limited to the described implementations. Changes, modifications, substitutions and variations of the implementations without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A charging gun control device, comprising a main control module, a power module and a charging gun electronic lock control module, wherein the power module is used to supply power to the control device. It is characterized in that The charging gun electronic lock control module includes a locking circuit, a primary unlocking circuit and a secondary unlocking circuit. The three circuits are all provided with output terminals for connecting to the electronic lock interface. One of the three circuits is turned on. The locking circuit is used to realize the locking of the electronic lock, and the primary unlocking circuit is used to realize the primary unlocking of the electronic lock, and the locking circuit and the primary unlocking circuit are both connected in series with the normally closed contact and the common contact of the first relay; the secondary unlocking circuit is connected in series with the normally open contact and the common contact of the first relay; The main control module is used to change the state of the first relay when the primary unlocking circuit is in the on state, so that the primary unlocking circuit is switched to the off state and the secondary unlocking circuit is switched to the on state, so as to realize the secondary unlocking of the electronic lock.

2. The charging gun control device according to claim 1, It is characterized in that Energy storage units are serially connected to both the locking circuit and the primary unlocking circuit. When the locking circuit is in an on state, the energy storage unit is in a charging state. When the primary unlocking circuit is in an on state, the energy storage unit is in a discharging state.

3. The charging gun control device according to claim 1, It is characterized in that The locking circuit is connected in series with a first normally open contact and a first common contact of the second relay, and the one-time unlocking circuit is connected in series with a first normally closed contact and a first common contact of the second relay.

4. The charging gun control device according to claim 1, It is characterized in that A first diode is connected in parallel at both ends of the first relay coil, and an anode of the first diode is connected to a cathode of the first relay coil.

5. The charging gun control device according to claim 3, It is characterized in that The second diode and the first absorption capacitor are connected in parallel at both ends of the second relay coil, and the anode of the second diode is connected to the cathode of the second relay coil.

6. The charging gun control device according to claim 1, It is characterized in that The two ends of the output terminal are connected in parallel with a clamping diode and a second absorption capacitor which are arranged in parallel.

7. The charging gun control device according to claim 3, It is characterized in that The second normally open contact of the second relay is grounded, the second normally closed contact of the second relay is suspended, the second common contact of the second relay is connected to the power supply through a pull-up resistor, and the second common contact of the second relay is also connected to the main control module so that the main control module knows whether the unlocking loop is in a conductive state.

8. The charging gun control device according to claim 1, It is characterized in that The control device also includes a temperature sampling module, which includes a voltage dividing branch, which is used to connect a gun tip resistor and an internal resistor in series, and the voltage dividing point between the gun tip resistor and the internal resistor is connected to the same-phase input terminal of the comparator, the inverting input terminal of the comparator is connected to the reference voltage, the output terminal of the comparator is connected to the same-phase input terminal of the voltage follower, and the output terminal of the voltage follower is connected to the main control module.

9. The charging gun control device according to claim 8, It is characterized in that The temperature sampling module also includes a filtering module, and the gun tip resistor is used to be serially arranged on the voltage dividing branch through the filtering module, and the filtering module includes a magnetic bead and a common mode inductor filtering unit.

10. The charging gun control device according to claim 1, It is characterized in that The power module includes a second-order filtering unit, which is used for performing second-order filtering on the input voltage.

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