Charging gun control circuit
By introducing cc circuit and CP circuit into the charging gun control circuit, the problem of electronic device damage caused by overcurrent of the charging gun is solved, more stable current detection and control is achieved, and the working reliability of the charging gun is improved.
Patent Information
- Application Number
- CN202422427134.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The existing charging gun detection circuit is prone to damage to electronic devices in the overcurrent state, and lacks an effective current detection mechanism.
The cc circuit and the CP circuit are introduced into the charging gun control circuit. The voltage is detected through the cc circuit and the state of the gun is judged using the operational amplifier. The CP circuit detects the duty cycle to confirm the charging gun current requirement, and controls the opening and closing of the charging gun in combination with the S2 driving circuit.
It improves the working stability of the charging gun, avoids component damage caused by excessive current, and enhances the accuracy and limiting ability of current detection.
Smart Images
Figure CN223140050U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy vehicles, in particular to a charging gun control circuit. Background Technique
[0002] At present, in the field of new energy vehicles, in order to comply with safety specifications and strengthen the protection of on-vehicle chargers, more and more on-vehicle chargers need to add a charging gun detection circuit with protection. In the existing charging gun detection circuit, when alternating current is detected, charging is carried out. This will cause electronic devices to be damaged when the charging gun is in an overcurrent state. For this reason, a charging gun control circuit is proposed to add the cc and cp states, so that before the on-vehicle charging gun charges, it is necessary to judge the current of the charging gun and the working state of the gun to avoid excessive current and damage to components. Summary of the Invention
[0003] The purpose of the utility model is to propose a charging gun control circuit to solve the above problems.
[0004] To achieve the above purpose, the utility model provides the following technical solution: a charging gun control circuit, including an MCU and an S2 drive circuit connected to the MCU and the charging gun; the feature is that a cc circuit capable of obtaining the voltage of the charging gun and a cp circuit for detecting the duty cycle and confirming the current demand of the charging gun are also connected in parallel between the MCU and the charging gun; the cc circuit includes that after the charging gun is plugged in, the internal resistance of the gun is connected to the negative electrode of diode D2, and the positive electrode of diode D2 is connected to one end of resistor R3, resistor R4, capacitor C5 and resistor R9; the other ends of resistor R3 and resistor R4 are connected to the power supply terminal 3.3V; the other end of capacitor C5 is connected to the ground; the other end of resistor R9 enters the positive input terminal of operational amplifier U1A; the cp circuit includes that the PWM input is connected to resistor R5, the other end of resistor R5 is connected to diode D4, resistor R10, capacitor C3, the base of triode Q1, diode D4, the emitter of triode Q1, the 3rd pin of inverting Schmitt trigger U2, and capacitor C2 is connected to the ground.
[0005] Preferably, the power supply terminal of the operational amplifier is connected to the power supply terminal 12V and capacitor C1; the other end of capacitor C1 is connected to the ground, capacitor C4 and the 1st pin of diode D3 are grounded; the 2nd pin of diode D3 is connected to the power supply terminal 3.3V; the other end of resistor R1 is connected to one end of capacitor C4 and the 3rd pin of diode D3, and enters the MCU.
[0006] Preferably, the other end of resistor R1 is connected to the power supply terminal 3.3V; the 5th pin of the inverting Schmitt trigger U2 is connected to the power supply terminal 3.3V and the other end of capacitor C2; the 4th pin of the inverting Schmitt trigger U2 outputs PWM to the MCU.
[0007] Preferably, the S2 drive circuit includes an MCU output connected to a resistor R1, the other end of the resistor R1 is connected to a capacitor C6, a resistor R11, and the pin 1 of a MOS transistor Q2; one ends of the capacitor C6, the resistor R11, the pin 2 of the MOS transistor, and a resistor R6 are grounded;
[0008] Preferably, the pin 3 of the MOS transistor is connected to a resistor R2; the other ends of the resistor R2 and the resistor R6 are connected to the negative electrode of a diode D1; the positive electrode of the diode D1 is connected to the input of a cp signal PWM.
[0009] The beneficial effects of the present utility model are as follows: After the voltage of the circuit is detected by the cc circuit and followed by an operational amplifier, the state of the gun is judged. The cp circuit detects the duty cycle and the state of the charging current of the charging gun, so that before charging, the charging gun can judge the current and the working state of the gun, avoiding excessive current and damaging components, thereby improving the working stability and reducing the damage of electronic devices. Description of the Drawings
[0010] Figure 1 is a schematic structural diagram of the charging gun control circuit of the present utility model.
[0011] Figure 2 is a connection diagram of the control cc circuit of the present utility model.
[0012] Figure 3 is a connection diagram of the control cp circuit of the present utility model.
[0013] Figure 4 is a connection diagram of the S2 drive circuit of the present utility model.
[0014] Legend: 1. MCU; 2. S2 drive circuit; 3. cc circuit; 4. cp circuit. Detailed Embodiments
[0015] Next, we will further describe a charging gun control circuit according to the present utility model with reference to the drawings.
[0016] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0017] Refer to the appendix Figures 1-4As shown in the figure, a charging gun control circuit in this embodiment includes an MCU1 and an S2 drive circuit 2 connected to the MCU1 and the charging gun. It is characterized in that a cc circuit 3 capable of obtaining the voltage of the charging gun and a cp circuit 4 for detecting the duty cycle and confirming the current demand of the charging gun are also connected in parallel between the MCU1 and the charging gun. The cc circuit 3 includes that after the charging gun is plugged in, the internal resistor of the gun is connected to the negative electrode of diode D2, and the positive electrode of diode D2 is connected to one ends of resistor R3, resistor R4, capacitor C5 and resistor R9. The other ends of resistor R3 and resistor R4 are connected to the power supply terminal 3.3V. The other end of capacitor C5 is connected to the ground. The other end of resistor R9 enters the positive input terminal of operational amplifier U1A. The PWM input of the cp circuit 4 is connected to resistor R5, the other end of resistor R5 is connected to diode D4, resistor R10, capacitor C3, the base of triode Q1, diode D4, the emitter of triode Q1, the 3rd pin of inverting Schmitt trigger U2, and capacitor C2 is connected to the ground. After the voltage of the detection circuit is detected by the cc circuit 3 and followed by the operational amplifier, the state of the gun is judged. The cp circuit 4 detects the duty cycle and the state of the charging gun current, so that before the in-vehicle charging gun charges, it judges the current of the charging gun and the working state of the gun, avoids excessive current and damages components, thereby improving the working stability and reducing the damage of electronic devices. By the MCU1 confirming the voltage state of the cc circuit 3 and the duty cycle state of the cp circuit 4, it outputs to control the MOS tube to control the opening and closing of the charging gun.
[0018] Refer to the appendix Figure 2 As shown in the figure, the power supply terminal of the operational amplifier is connected to the power supply terminal 12V and capacitor C1. The other end of capacitor C1 is connected to the ground, capacitor C4 and the 1st pin of diode D3 are grounded. The 2nd pin of diode D3 is connected to the power supply terminal 3.3V. The other end of resistor R1 is connected to one end of capacitor C4 and the 3rd pin of diode D3, and enters the MCU1. After receiving the voltage value, it is connected to the negative electrode of the diode, the positive electrode voltage of the diode is connected to the positive electrode of the operational amplifier, and the output enters the negative electrode of the operational amplifier and is compared with the positive electrode to output the voltage value for detecting the state of the charging gun.
[0019] Refer to the appendix Figure 3 As shown in the figure, the other end of resistor R1 is connected to the power supply terminal 3.3V. The 5th pin of the inverting Schmitt trigger U2 is connected to the power supply terminal 3.3V and the other end of capacitor C2. The 4th pin of the inverting Schmitt trigger U2 outputs PWM to the MCU1. After receiving the PWM signal, it is connected to the base of the triode to control the inversion of the triode, convert the level to the single-chip microcomputer power supply voltage, connect it to the A pin of the inverting Schmitt trigger, and the inverting Schmitt trigger outputs a stable duty cycle for detecting the state of the charging gun current.
[0020] Refer to the appendix Figure 4As shown, the S2 driving circuit 2 includes the output of the MCU1 connected to the resistor R1, the other end of the resistor R1 connected to the capacitor C6, the resistor R11 and the pin 1 of the MOS transistor Q2; one end of the capacitor C6, the resistor R11, the pin 2 of the MOS transistor and the resistor R6 is grounded; the pin 3 of the MOS transistor is connected to the resistor R2; the other ends of the resistor R2 and the resistor R6 are connected to the negative electrode of the diode D1; the positive electrode of the diode D1 is connected to the cp signal PWM input.
[0021] The working principle of the present invention is that the cp circuit 4, the cc circuit 3, and the S2 driving circuit 2 are connected to the charging gun to judge the state of the gun, improve the accuracy of the detection circuit and current limit; the cp circuit 4 detects the PWM signal, judges the PWM amplitude through the triode. When the PWM amplitude is higher than the triode turn-on voltage, the triode pulls low, and then pulls high the level through the inverting Schmitt trigger. When the PWM amplitude is lower than the triode turn-on voltage, the triode pulls high, and then pulls low through the Schmitt trigger. When the PWM is detected as low, the amplitude and positive duty cycle of the PWM are detected to limit the current. The cc circuit 3 detects the voltage, follows the voltage through the operational amplifier, and then judges the state of the gun. When the cc circuit 3 is not connected or semi-connected, the MOS transistor is not driven. After the cc circuit 3 is connected and the cp circuit 4 is working, the MOS transistor is driven to turn on, so that the gun outputs alternating current to achieve the purpose of charging.
[0022] The above embodiments are illustrative of the present invention, not limiting of the present invention. Any simple transformation of the present invention belongs to the protection scope of the present invention.
Claims
1. A charging gun control circuit, comprising an MCU (1) and an S2 drive circuit (2) connected to the MCU (1) and the charging gun; characterized in that A cc circuit (3) for obtaining the voltage of the charging gun and a cp circuit (4) for detecting the duty cycle and confirming the current requirement of the charging gun are also connected in parallel between the MCU (1) and the charging gun; after the charging gun is plugged in, the internal resistor of the gun is connected to the negative electrode of diode D2 in the cc circuit (3), and the positive electrode of diode D2 is connected to one end of resistor R3, resistor R4, capacitor C5 and resistor R9; the other ends of resistor R3 and resistor R4 are connected to the power supply terminal 3.3V; the other end of capacitor C5 is connected to the ground; the other end of resistor R9 enters the positive input terminal of operational amplifier U1A; the cp circuit (4) includes that the PWM input is connected to resistor R5, the other end of resistor R5 is connected to diode D4, resistor R10, capacitor C3, the base of triode Q1, diode D4, the emitter of triode Q1, the 3rd pin of the inverting Schmitt trigger U2, and capacitor C2 is connected to the ground.
2. The control circuit of a charging gun according to claim 1, wherein: The power supply terminal of the operational amplifier is connected to the power supply terminal 12V and capacitor C1; the other end of capacitor C1 is connected to the ground, capacitor C4 and the 1st pin of diode D3 is grounded; the 2nd pin of diode D3 is connected to the power supply terminal 3.3V; the other end of resistor R1 is connected to one end of capacitor C4 and the 3rd pin of diode D3, and enters the MCU (1).
3. The charging gun control circuit according to claim 1, characterized in that: The other end of resistor R1 is connected to the power supply terminal 3.3V; the 5th pin of the inverting Schmitt trigger U2 is connected to the power supply terminal 3.3V and the other end of capacitor C2; the 4th pin of the inverting Schmitt trigger U2 outputs PWM to the MCU (1).
4. The charging gun control circuit according to claim 1, characterized in that: The S2 drive circuit (2) includes that the output of the MCU (1) is connected to resistor R1, the other end of resistor R1 is connected to capacitor C6, resistor R11 and the 1st pin of MOS transistor Q2; capacitor C6, resistor R11, the 2nd pin of the MOS transistor and one end of resistor R6 are grounded.
5. The charging gun control circuit according to claim 4, wherein: The 3rd pin of the MOS transistor is connected to resistor R2; the other ends of resistor R2 and resistor R6 are connected to the negative electrode of diode D1; the positive electrode of diode D1 is connected to the cp signal PWM input.