Internal control module circuit of portable alternating current charging gun

Abstract

The utility model discloses an internal control module circuit of a portable alternating current charging gun in the technical field of charging guns, which comprises a dual 12V switching power supply, a control unit and an output unit, the dual 12V switching power supply is used for converting 220V alternating current mains supply into + 12V and-12V voltages for controlling a charger and supplying power to each chip in the module circuit, and the control unit is used for controlling the charger. The control unit is used for receiving a power selection signal of the switch and driving the output unit to output rectangular waves with different duty ratios to a CP pin of a charging gun so as to start a charger for charging and limit different charging currents; the beneficial effects of the utility model are that through the arrangement of the internal control module circuit, there is no need to arrange a controller outside the charging gun, the charging gun does not occupy extra volume, and the charging gun is convenient to carry and safe to use.

Description

Technical Field

[0001] The utility model relates to the technical field of charging guns, in particular to an internal control module circuit of a portable AC charging gun. Background Technique

[0002] As an energy supply station for electric vehicles, an electric vehicle charging pile is an important supporting infrastructure necessary for the commercial development of electric vehicles. A charging gun is a device that is connected to the mains electricity on the electric vehicle charging pile and supplies power to the electric vehicle. When the electric vehicle is charging, the charging gun is inserted into the on-vehicle charging port to connect with the on-vehicle charger. CP is the control connection line between the charging gun and the on-vehicle charger. When the charging gun is normally connected to the on-vehicle charger, the voltage is 12V. After the charging control circuit in the charging gun confirms that the signal is normal, the positive voltage of the PWM rectangular wave voltage generated by CP drops from 12V to 6V, and the negative voltage is 12V. After receiving this signal, the charging gun charges the electric vehicle normally.

[0003] With the popularization of new energy vehicles, to meet the charging needs of electric vehicles, the number and types of charging piles are becoming more and more diverse. The existing portable charging guns usually adopt the method of installing a control box outside the charging gun. This method has a large volume, is not convenient for operation and carrying, and has a single output power, and cannot meet the requirements of the user's household line load, thus forming a potential safety hazard. Therefore, we propose an internal control module circuit of a portable AC charging gun. Content of the Utility Model

[0004] The purpose of the utility model is to provide an internal control module circuit of a portable AC charging gun to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An internal control module circuit of a portable AC charging gun, including a dual 12V switching power supply, a control unit, and an output unit. The dual 12V switching power supply is used to convert 220V AC mains electricity into +12V and -12V voltages for charger control and supply power to each chip in this module circuit. The control unit is used to receive the power selection signal of the switch, drive the output unit to output rectangular waves with different duty cycles to the CP pin of the charging gun, so as to start the charger to charge and limit different charging currents.

[0006] Preferably, the dual 12V switching power supply includes a rectifier bridge, a switching power supply chip, and a switching transformer. The rectifier bridge is connected to the first winding of the switching transformer and is controlled by the switching power supply chip. The switching power supply chip is powered by the second winding of the switching transformer. The third winding of the switching transformer is connected to the first diode D1 and the second capacitor C2 to output +12V DC voltage. The fourth winding of the switching transformer is connected to the second diode D2 and the third capacitor C3 to output -12V DC voltage.

[0007] Preferably, the control unit includes an LDO voltage regulator, a single-chip microcomputer, a switch, and an LED lamp. The LDO voltage regulator converts the +12V voltage into the power supply voltage of the single-chip microcomputer. The switch is connected to the IO port of the single-chip microcomputer, and the switch is electrically connected to the LED lamp through the single-chip microcomputer.

[0008] Preferably, the output unit includes a voltage comparator and a push-pull circuit. After the +12V voltage is divided by the first resistor R1 and the second resistor R2, it is connected to the reference port of the voltage comparator. The comparison port of the voltage comparator is connected to the DA port of the single-chip microcomputer. The output end of the voltage comparator is connected to the input of the push-pull circuit, and the output of the push-pull circuit is connected to the CP pin of the charging gun.

[0009] Preferably, the single-chip microcomputer is an STC series single-chip microcomputer, and the model of the LDO voltage regulator is 7133.

[0010] Preferably, the push-pull circuit is composed of a first power transistor D3 and a second power transistor D4, and a second current-limiting resistor R4 is provided at its output.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] 1. By setting the internal control module circuit, there is no need to set a controller outside the charging gun, which does not occupy extra volume, is convenient to carry, and is safe to use;

[0013] 2. By setting a power selection switch, different output powers can be selected according to different chargers, with strong compatibility and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] In the figure: 1. Rectifier bridge; 2. Switching power supply chip; 3. Switching transformer; 4. LDO voltage regulator; 5. Single-chip microcomputer; 6. Voltage comparator; 7. Push-pull circuit; 8. Switch; 9. LED lamp. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Embodiment

[0017] Please refer to Figure 1 , the present utility model provides a technical solution:

[0018] A control module circuit for a portable AC charging gun, comprising a dual 12V switching power supply, a control unit, and an output unit. Among them, the dual 12V switching power supply is used to convert 220V AC mains into +12V and -12V voltages for charger control and power supply for each chip in this module circuit; the control unit is used to receive the power selection signal of switch 8 and drive the output unit to output waveforms with different duty cycles to the CP pin of the charging gun to start the charger charging and limit different charging currents.

[0019] Specifically, the dual 12V switching power supply includes a rectifier bridge 1, a switching power supply chip 2, and a switching transformer 3. The input end of the rectifier bridge 1 is electrically connected to 220V AC mains. The output DC voltage is filtered and shaped by the first capacitor C1 and then connected to the first winding of the switching transformer 3, and the first winding is controlled by the switching power supply chip 2. The switching power supply chip 2 is powered by the second winding of the switching transformer 3. The AC voltage output by the third winding of the switching transformer 3 is rectified and filtered by the first diode D1 and the second capacitor C2 to be converted into a +12V DC voltage. The AC voltage output by the fourth winding of the switching transformer 3 is rectified and filtered by the second diode D2 and the third capacitor C3 to be converted into a -12V DC voltage.

[0020] Specifically, the control unit includes an LDO voltage regulator 4, a single-chip microcomputer 5, a switch 8, and an LED lamp 9. Among them, the LDO voltage regulator 4 converts the +12V voltage into the power supply voltage for the single-chip microcomputer 5. The switch 8 is connected to the IO port of the single-chip microcomputer 5. The DA port of the single-chip microcomputer 5 outputs an analog voltage for control. The duty cycles output by the switch 8 correspond to 13%, 24%, 35%, and 53% respectively. When the switch 8 button is continuously and quickly pressed, the current can be switched. An LED lamp 9 is electrically connected between the grounding line of the LDO voltage regulator 4 and the single-chip microcomputer 5. When the switch 8 is continuously and quickly pressed four times for current switching, the LED lamp 9 is simultaneously controlled by the single-chip microcomputer 5 to blink, and further, different blinking frequencies of the LED lamp 9 correspond to different charging powers. Among them, the LED lamp 9 has four blinking frequencies, corresponding to four current options of 8A, 16A, 24A, and 32A respectively. It includes blinking once every four seconds corresponding to a 13% duty cycle, blinking twice every four seconds corresponding to a 24% duty cycle, blinking three times every four seconds corresponding to a 35% duty cycle, and blinking four times every four seconds corresponding to a 53% duty cycle.

[0021] Specifically, the output unit includes a voltage comparator 6 and a push-pull circuit 7. The 12V voltage is divided by the first resistor R1 and the second resistor R2 and then connected to the reference port of the voltage comparator 6. The comparison port of the voltage comparator 6 is connected to the DA port of the single-chip microcomputer 5. The output end of the voltage comparator 6 is connected to the input of the push-pull circuit 7 through the first current-limiting resistor R3. The push-pull circuit 7 is composed of a first power transistor D3 and a second power transistor D4, and its output is connected to the CP pin of the charging gun after being current-limited by the second current-limiting resistor R4.

[0022] The single-chip microcomputer 5 adopts the single-chip microcomputer of the STC series, and the LDO voltage regulator 4 selects the model 7133 to output a 3.3V voltage.

[0023] The working principle and usage method of the present utility model: After connecting to the 220V AC mains, the dual 12V switching power supply converts the 220V AC voltage into +12V and -12V DC voltages. The single-chip microcomputer 5 outputs different voltages through the DA port according to the received key signal of the switch 8 to generate a rectangular wave for the voltage comparator 6, and then drives the push-pull circuit 7 to make the charging gun CP needle appear waveforms with different duty cycles, so as to realize the selection of starting the charger and the charging power current. The power is switched by quickly pressing the switch 8 four times continuously. There are four current options of 8A, 16A, 24A, and 32A, which basically cover the existing charger models and greatly facilitate the users.

Claims

1. An internal control module circuit of a portable AC charging gun, characterized in that: It includes a dual 12V switching power supply, a control unit, and an output unit. The dual 12V switching power supply is used to convert 220V AC mains into +12V and -12V voltages for charger control and supply power to each chip in this module circuit. The control unit is used to receive the power selection signal of switch (8) and drive the output unit to output rectangular waves with different duty cycles to the CP pin of the charging gun to start the charger charging and limit different charging currents.

2. The internal control module circuit of a portable AC charging gun according to claim 1, characterized in that: The dual 12V switching power supply includes a rectifier bridge (1), a switching power supply chip (2), and a switching transformer (3). The rectifier bridge (1) is connected to the first winding of the switching transformer (3) and is controlled by the switching power supply chip (2). The switching power supply chip (2) is powered by the second winding of the switching transformer (3). The third winding of the switching transformer (3) is connected to the first diode D1 and the second capacitor C2 to output +12V DC voltage. The fourth winding of the switching transformer (3) is connected to the second diode D2 and the third capacitor C3 to output -12V DC voltage.

3. The internal control module circuit of a portable AC charging gun according to claim 1, characterized in that: The control unit includes an LDO voltage regulator (4), a single-chip microcomputer (5), a switch (8), and an LED lamp (9). Among them, the LDO voltage regulator (4) converts the +12V voltage into the power supply voltage of the single-chip microcomputer (5). The switch (8) is connected to the IO port of the single-chip microcomputer (5), and the switch (8) is electrically connected to the LED lamp (9) through the single-chip microcomputer (5).

4. The internal control module circuit of a portable AC charging gun according to claim 1, characterized in that: The output unit includes a voltage comparator (6) and a push-pull circuit (7). After the +12V voltage is divided by the first resistor R1 and the second resistor R2, it is connected to the reference port of the voltage comparator (6). The comparison port of the voltage comparator (6) is connected to the DA port of the single-chip microcomputer (5). The output end of the voltage comparator (6) is connected to the input of the push-pull circuit (7), and the output of the push-pull circuit (7) is connected to the CP pin of the charging gun.

5. The internal control module circuit of a portable AC charging gun according to claim 3, characterized in that: The single-chip microcomputer (5) is an STC series single-chip microcomputer, and the model of the LDO voltage regulator (4) is 7133.

6. The internal control module circuit of a portable AC charging gun according to claim 4, characterized in that: The push-pull circuit (7) is composed of a first power transistor D3 and a second power transistor D4, and its output is provided with a second current-limiting resistor R4.

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