An electric vehicle charging wake-up circuit and an electric vehicle

Abstract

The application discloses an electric vehicle charging wake-up circuit, comprising a CP signal driving circuit and an enable control circuit, wherein an input end of the CP signal driving circuit inputs a CP signal, an output end of the CP signal driving circuit is connected to the enable control circuit, one end of the enable control circuit is connected to KL30, and the other end of the enable control circuit is connected to an enable input end of a power management chip; the CP signal driving circuit is used for outputting a control signal to the enable control circuit based on the CP signal, so that the enable control circuit outputs a wake-up signal to the enable input end of the power management chip. The application has the advantages that the circuit structure is simple, stable and reliable; the CP signal is used for wake-up control, the CP signal is used as a wake-up signal source, even if charging is completed, a charging gun is in a state of being inserted, a device can normally enter a sleep state, battery consumption is reduced, and the risk of battery feeding is solved. The circuit has strong anti-interference capability, fast response, and is simple and cost-saving.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging control, and particularly to an electric vehicle charging wake-up circuit and an electric vehicle. Background Technology

[0002] Most electric vehicles nowadays are equipped with onboard chargers, also known as AC chargers. When the vehicle is in sleep mode, waking up the OBC, BMS, and VCU is an essential step in the charging process. Therefore, research into reducing power consumption and minimizing battery drain is crucial.

[0003] In existing technologies, slow charging wake-up circuits mainly use CC wake-up. The common practice is to use constant power (KL30) through an internal resistor to form a circuit with the CC resistor of the charging port, and to use diodes and transistors to form a wake-up signal. This will cause the BMS or VCU to be unable to go into sleep mode when the charging gun is not unplugged, and will continue to consume the battery power. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electric vehicle charging wake-up circuit and an electric vehicle, which uses a CP signal for wake-up control and sets up a circuit to ensure sleep after charging is completed, thereby reducing power consumption.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electric vehicle charging wake-up circuit, comprising a CP signal driving circuit and an enable control circuit. The input terminal of the CP signal driving circuit receives a CP signal, and its output terminal is connected to the enable control circuit. One end of the enable control circuit is connected to KL30, and the other end is connected to the enable input terminal of the power management chip. The CP signal driving circuit is used to output a wake-up signal to the enable input terminal of the power management chip based on the CP signal.

[0006] The CP signal driving circuit includes a transistor Q1 and a diode D1. The CP signal input value is the anode of the diode D1, and the cathode of the diode D1 is connected to the base of the transistor Q1. The collector and emitter of the transistor Q1 are respectively connected to the enable control circuit and KL31.

[0007] The CP signal driving circuit also includes capacitors C1 and C2 and resistors R1 and R2. Capacitor C1 and resistor R2 are connected in series between the base of transistor Q1 and the cathode of diode D1. One end of C1 is connected to the cathode of D1, and the other end of C1 is connected to the base of Q1 through resistor R2 and to KL31 through resistor R1. The base of transistor Q1 is grounded through capacitor C2.

[0008] The CP signal driving circuit also includes a diode D2 connected in series between capacitor C1 and resistor R2, wherein the anode of diode D2 is connected to capacitor C1 and the cathode of diode D2 is connected to resistor R2.

[0009] The CP signal driving circuit also includes a resistor R3, and the base of transistor Q1 is connected to KL31 via resistor R3.

[0010] The enable control circuit includes transistor Q2, resistors R3 and R5. KL30 is connected to one end of resistor R4, and the other end of resistor R4 is connected to the collector of transistor Q1 via resistor R5. A terminal is led out in the loop between resistors R4 and R5 and connected to the base of transistor Q2. The collector and emitter of transistor Q2 are respectively connected to the enable input terminal of KL30 and the power management chip.

[0011] The enable control circuit also includes diode D3, and KL30 is connected to resistor R4 and transistor Q2 via diode D3.

[0012] The power management chip's input terminal is connected to KL31 via resistor R76.

[0013] An electric vehicle, wherein the electric vehicle uses the electric vehicle charging wake-up circuit described above for charging wake-up control.

[0014] The advantages of this invention are: simple and stable circuit structure; the use of a CP signal for wake-up control, with the CP signal as the wake-up signal source, ensures that even after charging is complete and the charging gun is in the plugged-in state, the device can normally enter a sleep state, reducing battery consumption and mitigating the risk of battery depletion. The circuit also boasts strong anti-interference capabilities, fast response, and is simple and cost-effective. Attached Figure Description

[0015] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0016] Figure 1 This is a schematic diagram of the wake-up circuit of the present invention. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0018] This invention patent uses the CP signal as a wake-up signal source. Even after charging is complete and the charging gun is plugged in, the device can normally enter a sleep state, reducing battery consumption and eliminating the risk of battery depletion. The specific solution is as follows:

[0019] like Figure 1As shown, this application uses the CP signal as the wake-up signal source and implements wake-up control of the charging control unit through circuit design. This application takes the battery management chip as the charging control unit as an example for explanation.

[0020] like Figure 1 As shown, an electric vehicle charging wake-up circuit based on the CP signal includes transistors Q1 and Q2; wherein K30 is connected to the anode of diode D3, and the cathode of diode D3 is connected to the power supply input terminal Vin of the battery management chip PMIC, one end of resistor R4, and the collector of transistor Q2; the other end of resistor R4 is connected to the collector of transistor Q1 via resistor R5; the emitter of transistor Q2 is connected to the input enable pin EN of the power management chip; and a terminal is led out between resistors R4 and R5 and connected to the base of transistor Q2.

[0021] The emitter of transistor Q1 is connected to KL31; the base of transistor Q1 is connected to the cathode of diode D2 via resistor R2, and the anode of diode D2 is connected to the cathode of diode D1 via capacitor C1. The anode of diode D1 receives the CP signal; one end of resistor R1 is connected to the anode of D2, and the other end is connected to KL31; one end of capacitor C2 is connected between the base of Q1 and R2, and the other end is connected to KL31; the base of transistor Q1 is connected to KL31 via resistor R3.

[0022] The enable control pin EN of the power management chip PMIC is connected to the KL31 via resistor R6.

[0023] The KL30 and K31 batteries power the entire product, but with Q2 off, the power management chip is not enabled. Due to the presence of the filtering circuit, even when the charging gun is plugged in, current flows through Q1, triggering Q2 to conduct, and the EN pin of the power management chip goes high, thus starting the power supply. Otherwise, the EN pin of the power management chip goes low and it cannot operate.

[0024] Battery constant power is generally indicated by KL30, and ground is generally indicated by KL31, which is mostly connected to the vehicle body ground. Power is supplied to the entire circuit through KL30 and KL31. The power supply control device generates PWM signals ranging from -12V to 12V; the CP will emit a PWM signal when the charging gun is plugged in.

[0025] When the charging gun is inserted during charging, the CP signal becomes a PWM signal. When CP is a PWM signal, the current flows through D2, R2, and R3, causing Q1 to conduct. After Q1 conducts, KL30 is connected to KL31 through resistors R4 and R5, forming a power-on circuit. The voltage is divided by resistors R4 and R5, and the input voltage value is applied to the base of Q2, causing Q2 to conduct. After transistor Q2 conducts, KL30 is sent to the enable terminal EN through D3. At this time, EN is at a high level. After Q1 conducts, Q2 conducts, and the power management chip is enabled to work.

[0026] When charging is complete and the charging gun is not removed, although the charging gun is not removed, CP is a level signal. Due to the presence of R3, C2 will be immediately discharged to a level insufficient to keep Q1 conducting; the wake-up signal will be pulled low by R6, and the power management chip will enter a sleep state.

[0027] In the circuit, C1, R1, C2, and R2 form a bandpass filter, which can enhance the signal's anti-interference capability; D2 can maintain the energy for Q1 to conduct, and the device will not be turned off when the PWM is low; D1 and D3 are anti-reverse diodes.

[0028] After charging is complete, the CP signal changes from PWM to a level signal, which is insufficient to keep Q1 conducting. Therefore, the power management chip is pulled low and enters modification mode, so it can automatically go into sleep mode after charging is complete. C1, R1, C2, and R2 form a bandpass filter, which can enhance the signal's anti-interference capability.

[0029] Obviously, the specific implementation of this invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A charging wake-up circuit for electric vehicles, characterized in that: It includes a CP signal driving circuit and an enable control circuit. The input terminal of the CP signal driving circuit is connected to the CP signal, and its output terminal is connected to the enable control circuit. One end of the enable control circuit is connected to KL30, and the other end is connected to the enable input terminal of the power management chip. The CP signal driving circuit is used to output a wake-up signal to the enable input terminal of the power management chip based on the CP signal. The CP signal driving circuit includes a transistor Q1 and a diode D1. The CP signal is input to the anode of the diode D1, and the cathode of the diode D1 is connected to the base of the transistor Q1. The collector and emitter of the transistor Q1 are respectively connected to the enable control circuit and KL31. The CP signal driving circuit also includes capacitors C1 and C2 and resistors R1 and R2. The capacitor C1 and resistor R2 are connected in series between the base of transistor Q1 and the cathode of diode D1. One end of C1 is connected to the cathode of D1, and the other end of C1 is connected to the base of Q1 through resistor R2 and to KL31 through resistor R2. The base of transistor Q1 is grounded through capacitor C2. The CP signal driving circuit also includes a diode D2 connected in series between capacitor C1 and resistor R2, wherein the anode of diode D2 is connected to capacitor C1 and the cathode of diode D2 is connected to resistor R2. The CP signal driving circuit also includes a resistor R3, and the base of transistor Q1 is connected to KL31 via resistor R3; The enable control circuit includes transistor Q2, resistors R3 and R5. KL30 is connected to one end of resistor R4, and the other end of resistor R4 is connected to the collector of transistor Q1 via resistor R5. A terminal is led out in the loop between resistors R4 and R5 and connected to the base of transistor Q2. The collector and emitter of transistor Q2 are respectively connected to the enable input terminal of KL30 and the power management chip. The enable control circuit also includes diode D3. KL30 is connected to resistor R4 and transistor Q2 via diode D3. The enable input terminal of the power management chip is connected to KL31 via resistor R6.

2. An electric vehicle, characterized in that: The electric vehicle uses the electric vehicle charging wake-up circuit as described in claim 1 for charging wake-up control.

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