Charging gun signal triggering and resistance switching circuit

Abstract

The utility model discloses a kind of charging gun signal triggering and resistance switching circuit, belong to electric automobile technical field, including control circuit, radio frequency module and CC guide circuit integrated on the PCBA module of charging gun;Control circuit includes processor, power supply VCC, electrically controlled switch S1, S2;Power supply VCC is connected to the power supply end of processor, processor is connected to the control end of electrically controlled switch S1, S2, processor also receives CP signal;CC guide circuit includes microswitch, resistance R3 and R6, one end of microswitch is connected to ground through electrically controlled switch S2, resistance R6 series connection, the other end is grounded through resistance R3;The IO interface of radio frequency module is connected to power supply VCC through resistance R2 and R1 series connection, resistance R1, R3 voltage division connection;The power supply end of radio frequency module is connected to power supply VCC through the contact series connection of electrically controlled switch S1;The utility model has realized the simplification and integration design of circuit structure, improve the reliability and stability of circuit.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a charging gun signal triggering and resistance switching circuit. Background Technology

[0002] With the popularization of new energy vehicles, the electric vehicle charging field is developing towards intelligent fast charging. Currently, electric vehicle charging guns typically use a push-button switch to control the transmission of radio frequency signals and the switching of the guiding resistor, thereby opening the charging compartment door and connecting to the charging system. However, existing technology requires two buttons to control the transmission of radio frequency signals and the switching of the guiding resistor separately, which is relatively complex to operate and increases the probability of circuit damage and failure, resulting in poor convenience and stability of the switching between radio frequency signals and guiding resistors during charging.

[0003] Existing technology, such as the circuit disclosed in publication number CN221240350U for switching between a single-button triggered RF signal and a guide resistor, includes: a CC guide circuit, a normally closed push-button switch SW3, an RF chip circuit, a transistor switch circuit, and a signal reverse protection circuit. The CC guide circuit, RF chip circuit, transistor switch circuit, and signal reverse protection circuit are integrated into a PCBA module. The PCBA module can switch the charging guide signal and the trigger RF signal using the normally closed push-button switch SW3. This invention improves the reliability of simultaneous signal triggering at both the RF signal transmission and guide resistor switching circuits by setting a single-button triggered RF signal and guide resistor switching circuit, improves the accuracy of the CC connection guide signal sampling value, and reduces the risk of charging status detection errors due to signal inaccuracy. Using a normally closed push-button switch SW3 also reduces the possibility of charging failure when the RF module fails. Although this solution achieves single-button control, the components are distributed across the charging column and charging gun, resulting in low integration and a complex circuit structure, raising concerns about operational reliability. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a charging gun signal triggering and resistance switching circuit, which simplifies the circuit structure and integrates the design, thereby improving the reliability and stability of the circuit.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] This utility model provides a charging gun signal triggering and resistance switching circuit, including:

[0007] The control circuit includes a processor, a power supply VCC, an electronic control switch S1, and an electronic control switch S2; the power supply VCC is connected to the power supply terminal of the processor, the processor is connected to the control terminals of the electronic control switches S1 and S2, and the processor also receives a CP signal;

[0008] The CC guiding circuit includes a micro switch S3, a resistor R3 and a resistor R6. One end of the micro switch S3 is connected to ground via the electronic control switch S2 and the resistor R6 in series, and the other end of the micro switch S3 is connected to ground via the resistor R3. The common terminal of the micro switch S3 and the resistor R3 serves as the CC signal terminal.

[0009] The radio frequency module has its IO interface connected in series with the power supply VCC via resistors R2 and R1. The common terminal of resistors R2 and R1 is connected to the common terminal of micro switch S3 and electronic control switch S2. The power supply terminal of the radio frequency module is connected in series with the power supply VCC via the contacts of electronic control switch S1.

[0010] The control circuit, the radio frequency module, and the CC guiding circuit are integrated on a PCBA module of the charging gun.

[0011] Optionally, the electronic control switch S1 and the electronic control switch S2 are relays or MOSFETs.

[0012] Optionally, the antenna interface of the radio frequency module is connected to an ANT antenna unit.

[0013] Optionally, a diode is also connected between the common terminal of resistors R2 and R1 and the common terminal of microswitch S3 and electronic control switch S2, with the negative terminal of the diode facing microswitch S3.

[0014] Optionally, the micro switch S3 is normally closed by default.

[0015] Optionally, the resistance value of resistor R1 is much larger than the resistance value of resistor R3.

[0016] Optionally, the power supply VCC is a low-voltage DC power supply provided by mode 2 or the charging pile to the charging gun.

[0017] Optionally, the processor is an MCU chip.

[0018] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0019] This utility model provides a charging gun signal triggering and resistance switching circuit. The entire circuit is integrated into a single PCBA module, which is then mounted on the charging gun. This not only reduces space utilization within the charging gun but also simplifies the assembly structure, facilitating assembly and production. The simplified and integrated circuit design improves the circuit's reliability and stability. Furthermore, by modifying the standard series circuit into a parallel circuit, the microswitch's action has an independent impact on each function. Specifically, the RF signal will not affect the vehicle's sampling, and the RF function is completely disabled when the CC function is active. Attached Figure Description

[0020] Figure 1 This is a topology diagram of the charging gun signal triggering and resistance switching circuit provided in this embodiment of the utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0022] Example 1:

[0023] like Figure 1 As shown, this utility model provides a charging gun signal triggering and resistance switching circuit, including a control circuit, an RF module, and a CC guiding circuit. The control circuit, RF module, and CC guiding circuit are integrated on a PCBA module of the charging gun. By integrating the entire circuit design onto a single PCBA module and then assembling it on the charging gun, not only is the space utilization in the charging gun reduced, but the assembly structure is also simplified, facilitating assembly and production.

[0024] The control circuit includes a processor, a power supply VCC, and electronic switches S1 and S2. The power supply VCC is connected to the processor's power supply terminal, and the processor is connected to the control terminals of electronic switches S1 and S2. The processor also receives a CP signal. The CC guiding circuit includes a micro switch S3, resistors R3 and R6. One end of micro switch S3 is grounded via electronic switch S2 and resistor R6 in series, and the other end of micro switch S3 is grounded via resistor R3. The common terminal of micro switch S3 and resistor R3 serves as the CC signal terminal. The IO interface of the RF module is connected to the power supply VCC via resistors R2 and R1 in series. The common terminal of resistors R2 and R1 is connected to the common terminal of micro switch S3 and electronic switch S2. The power supply terminal of the RF module is connected to the power supply VCC via the contacts of electronic switch S1. Micro switch S3 is normally closed by default.

[0025] The CP signal at the CP signal terminal serves as a control confirmation, primarily responsible for controlling the electric vehicle. Under normal circumstances, when the CP signal voltage is 12V, the RF module needs to send an RF signal to trigger the charging port cover to open automatically; when the CP signal voltage is 9V or 6V, the RF module no longer needs to send an RF signal.

[0026] Specifically, in this embodiment, when the processor receives a CP signal of 12V, it closes the power control switch S1 and supplies power to the RF module through the power supply VCC. The RF module's IO interface works normally. At the same time, the power control switch S2 is opened, so that resistors R1 and R3 form a voltage divider circuit. When the processor receives a CP signal of 9V or 6V, it opens the power control switch S1, the RF module loses power and shuts down, and closes the power control switch S2. Resistors R3 and R6 form the CC resistance value.

[0027] Since the micro switch S3 is normally closed by default, the voltage at point TP1 is obtained by the voltage divider between resistors R1 and R3. By setting the resistance of resistor R1 to be much greater than the resistance of resistor R3, the voltage at point TP2 is close to 0V.

[0028] When microswitch S3 is pressed, the switch is open. At this time, on the one hand, the power supply VCC provides a high level to the RF module's IO through resistors R1 and R2, triggering the RF module to send RF signals. On the other hand, the resistance of CC changes to that of resistor R3 (half-connected state), meeting the national standard charging requirements.

[0029] Furthermore, the RF module's antenna interface is connected to an ANT antenna unit, improving signal transmission performance.

[0030] A diode is also connected between the common terminal of resistors R2 and R1 and the common terminal of microswitch S3 and electronic control switch S2. The negative terminal of the diode faces microswitch S3 to achieve unidirectional signal conduction and protect the normal operation of the RF module and CC guiding circuit.

[0031] The power supply VCC is the low-voltage DC power supplied by the charging station to the charging gun in Mode 2. The processor uses an MCU chip. In other alternative implementations, other power supply or processor types can also be configured.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A charging gun signal triggering and resistance switching circuit, characterized in that, include: The control circuit includes a processor, a power supply VCC, an electronic control switch S1, and an electronic control switch S2. The power supply VCC is connected to the power supply terminal of the processor, the processor is connected to the control terminals of the electronic control switch S1 and the electronic control switch S2, and the processor also receives the CP signal; The CC guiding circuit includes a micro switch S3, a resistor R3 and a resistor R6. One end of the micro switch S3 is connected to ground via the electronic control switch S2 and the resistor R6 in series, and the other end of the micro switch S3 is connected to ground via the resistor R3. The common terminal of the micro switch S3 and the resistor R3 serves as the CC signal terminal. The radio frequency module has its IO interface connected in series with the power supply VCC via resistors R2 and R1. The common terminal of resistors R2 and R1 is connected to the common terminal of micro switch S3 and electronic control switch S2. The power supply terminal of the radio frequency module is connected in series with the power supply VCC via the contacts of electronic control switch S1. The control circuit, the radio frequency module, and the CC guiding circuit are integrated on a PCBA module of the charging gun.

2. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The electronic control switch S1 and the electronic control switch S2 are either relays or MOSFETs.

3. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The RF module's antenna interface is connected to an ANT antenna unit.

4. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, A diode is also connected between the common terminal of resistors R2 and R1 and the common terminal of microswitch S3 and electronic control switch S2, with the negative terminal of the diode facing microswitch S3.

5. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The micro switch S3 is normally closed by default.

6. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The resistance value of resistor R1 is much greater than the resistance value of resistor R3.

7. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The power supply VCC is the low-voltage DC power supply provided by mode 2 or the charging pile to the charging gun.

8. The charging gun signal triggering and resistance switching circuit according to claim 1, characterized in that, The processor uses an MCU chip.

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