Charging gun CC resistor detection and wake-up circuit

Abstract

The utility model discloses a charging gun CC resistance detection and wake-up circuit, which comprises a wake-up circuit, a CC resistance detection circuit and a POWER IC, the wake-up circuit is electrically connected with a KEYIN pin of the POWER IC, the CC resistance detection circuit is electrically connected with an ADC port of the POWER IC, when a charging gun is inserted, the wake-up circuit converts an input resistance signal into a voltage signal, and the voltage signal is transmitted to the power supply circuit. The CC resistor detection circuit detects the CC resistor voltage signal and inputs the voltage signal to the POWER IC to perform wake-up power supply, the POWER IC detects the CC resistor voltage signal through the CC resistor detection circuit, the CC resistor resistance value can be calculated, the CC resistor detection and ECU wake-up functions can be realized through the CC signal, and the power supply circuit is suitable for various types of charging gun interfaces. The charging gun CC resistor detection and wake-up circuit provided by the utility model has the effect of simultaneously satisfying a wake-up function and a detection function.

Description

Technical Field

[0001] The utility model relates to the technical field of DC power supply, in particular to a CC resistor detection and wake-up circuit for a charging gun. Background Technique

[0002] The charging gun has become an essential accessory for new energy vehicles. Its two important functions are A+ wake-up and CC resistor detection. After the charging gun is inserted, the A+ port inputs a 12V signal to the ECU for wake-up. The 12V A+ signal wakes up the integrated PowerIC, and then converts and outputs 5V to supply power to the POWER ICU. After it collects the A+ signal and simultaneously confirms that the CC connection is normal, it will send a wake-up command to the BMS module. After the BMS is woken up, charging can be carried out. The specific charging requirements are transmitted through the CAN line. There is also a type of charging gun that needs to detect the RC value on the CC to determine the cable rated capacity and select an appropriate charging power; such a charging gun does not have an A+ wake-up signal interface, so the above CC detection scheme cannot simultaneously meet the functional requirements of wake-up and detection. Now, a circuit that simultaneously meets wake-up and detection is proposed. Content of the Utility Model

[0003] In view of the above problems, a CC resistor detection and wake-up circuit for a charging gun is provided to solve the deficiencies in the prior art.

[0004] The specific technical solution is as follows:

[0005] A CC resistor detection and wake-up circuit for a charging gun includes a wake-up circuit, a CC resistor detection circuit, and a POWER IC. The wake-up circuit is electrically connected to the KEY_IN pin of the POWER IC, and the CC resistor detection circuit is electrically connected to the ADC port of the POWER IC. When the charging gun is inserted, the wake-up circuit converts the input resistance signal into a voltage signal and inputs the voltage signal to the POWER IC to supply power for its wake-up. The POWER IC detects the CC resistor voltage signal through the CC resistor detection circuit, and then the CC resistor value can be calculated.

[0006] The above-mentioned charging gun CC resistor detection and wake-up circuit also has the following characteristics. The wake-up circuit includes a CC resistor R3, a connection terminal S1, a resistor R8, a resistor R9, a power supply VB, a capacitor C3, a field effect transistor Q3, and a power supply Power IC. One end of the connection terminal S1 is grounded through the CC resistor R3, and the other end of the connection terminal S1 is sequentially electrically connected to the power supply VB through the resistor R8 and the resistor R9. The capacitor C3 is connected in parallel across the two ends of the resistor R9. The common terminal of the resistor R8 and the resistor R9 is electrically connected to the gate of the field effect transistor Q3. The common terminal of the resistor R9 and the power supply VB is electrically connected to the source of the field effect transistor Q3. The drain of the field effect transistor Q3 is electrically connected to the enable terminal of the power supply Power IC. The output terminal of the power supply Power IC is electrically connected to the power input terminal of the POWER IC.

[0007] The above-mentioned charging gun CC resistor detection and wake-up circuit also has the following characteristics. The CC resistor detection circuit includes a power supply VDD, a diode D1, a diode D3, a capacitor C1, a capacitor C5, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a triode Q1, and a triode Q2. The resistor R3 is electrically connected to the cathode of the diode D1 through the connection terminal S1. The cathode of the diode D1 is grounded through the diode D3. The capacitor C5 is connected in parallel across the two ends of the diode D3. The anode of the diode D1 is sequentially electrically connected to the power supply VDD through the resistor R2 and the resistor R1. The common terminal of the resistor R1 and the resistor R2 is electrically connected to the collector of the triode Q2. The common terminal of the resistor R1 and the power supply VDD is electrically connected to the emitter of the triode Q2. The emitter of the triode Q2 is electrically connected to its base through the resistor R7. The base of the triode Q2 is electrically connected to the collector of the triode Q1 through the resistor R6. The emitter of the triode Q1 is grounded. The emitter of the triode Q1 is also electrically connected to its base through the resistor R5. The base of the triode Q1 is electrically connected to the input GPIO of the POWER IC through the resistor R4.

[0008] The anode of the diode D1 is also sequentially grounded through the resistor R10 and the capacitor C1. The common terminal of the resistor R10 and the capacitor C1 is electrically connected to the acquisition terminal ADC of the POWER IC.

[0009] The above-mentioned charging gun CC resistor detection and wake-up circuit also has the following characteristics. The connection terminal S1 is the port where the CC resistor connects to the ECU. When the charging gun is inserted, the connection terminal S1 is closed.

[0010] The above charging gun CC resistor detection and wake-up circuit also has the following characteristics: the resistor R3 represents the RC resistor on the CC.

[0011] In summary, the beneficial effects of this solution are:

[0012] In the charging gun CC resistor detection and wake-up circuit provided by the present utility model, the functions of CC resistor detection and ECU wake-up can be realized through the CC signal, which is applicable to various types of charging gun interfaces. The charging gun CC resistor detection and wake-up circuit provided by the present utility model has the effect of simultaneously satisfying the wake-up function and the detection function. Description of the Drawings

[0013] Figure 1 is the structural diagram of the wake-up circuit of the present utility model;

[0014] Figure 2 is the structural diagram of the CC resistor detection circuit of the present utility model. Detailed Embodiments

[0015] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0016] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0017] Next, the present utility model will be further described in conjunction with specific embodiments, but it is not limited to the present utility model.

[0018] Figure 1 is the structural diagram of the wake-up circuit of the present utility model, Figure 2 is the structural diagram of the CC resistor detection circuit of the present utility model. As Figure 1 and Figure 2 shown, the charging gun CC resistor detection and wake-up circuit provided in this embodiment includes a wake-up circuit, a CC resistor detection circuit, and a POWER IC. The wake-up circuit is electrically connected to the KEY_IN pin of the POWER IC, and the CC resistor detection circuit is electrically connected to the ADC port of the POWER IC. When the charging gun is inserted, the wake-up circuit converts the input resistance signal into a voltage signal and inputs the voltage signal to the POWER IC to supply power for its wake-up. The POWER IC detects the CC resistor voltage signal through the CC resistor detection circuit, and then the resistance value of the CC resistor can be calculated.

[0019] In the above embodiment, the wake-up circuit includes a CC resistor R3, a terminal S1, a resistor R8, a resistor R9, a power supply VB, a capacitor C3, a field-effect transistor Q3, and a power supply Power IC. One end of the terminal S1 is grounded through the CC resistor R3, and the other end of the terminal S1 is sequentially electrically connected to the power supply VB through the resistor R8 and the resistor R9. The capacitor C3 is connected in parallel across the two ends of the resistor R9. The common terminal of the resistor R8 and the resistor R9 is electrically connected to the gate of the field-effect transistor Q3. The common terminal of the resistor R9 and the power supply VB is electrically connected to the source of the field-effect transistor Q3. The drain of the field-effect transistor Q3 is electrically connected to the enable terminal of the power supply Power IC, and the output terminal of the power supply Power IC is electrically connected to the power input terminal of the POWERIC.

[0020] It should be noted that the function of the capacitor C3 is to play a filtering role during load dump to ensure that the triode Q3 will not conduct and cause false wake-up.

[0021] In the above embodiment, the CC resistor detection circuit includes a power supply VDD, a diode D1, a diode D3, a capacitor C1, a capacitor C5, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a triode Q1, and a triode Q2. The resistor R3 is electrically connected to the cathode of the diode D1 through the terminal S1. The cathode of the diode D1 is grounded through the diode D3. The capacitor C5 is connected in parallel across the two ends of the diode D3. The anode of the diode D1 is sequentially electrically connected to the power supply VDD through the resistor R2 and the resistor R1. The common terminal of the resistor R1 and the resistor R2 is electrically connected to the collector of the triode Q2. The common terminal of the resistor R1 and the power supply VDD is electrically connected to the emitter of the triode Q2. The emitter of the triode Q2 is electrically connected to its base through the resistor R7. The base of the triode Q2 is electrically connected to the collector of the triode Q1 through the resistor R6. The emitter of the triode Q1 is grounded, and the emitter of the triode Q1 is also electrically connected to its base through the resistor R5. The base of the triode Q1 is electrically connected to the input GPIO of the POWER IC through the resistor R4;

[0022] The anode of the diode D1 is also sequentially grounded through the resistor R10 and the capacitor C1. The common terminal of the resistor R10 and the capacitor C1 is electrically connected to the acquisition terminal ADC of the POWER IC.

[0023] It should be noted that the anode of the diode D1 is the detection point.

[0024] In the above embodiment, the terminal S1 is the port for the CC resistor to connect to the ECU. When the charging gun is inserted, the terminal S1 is closed.

[0025] In the above embodiment, the resistor R3 represents the RC resistor on the CC.

[0026] Working principle: When the CC signal is not connected (i.e., the terminal S1 is disconnected), the CC resistor R3, resistor R8, resistor R9, and power supply VB cannot form a voltage division circuit. The conduction threshold of the triode Q3 is (-1V, -2.5V). Therefore, at this time, the triode Q3 is in the cut-off state. Then, the voltage at the Drain terminal of the triode Q3 is 0V, that is, the voltage at the enable terminal of the Power IC is 0V, and it cannot output a 5V level, so the system cannot be awakened.

[0027] After the CC signal is connected (i.e., the terminal S1 is closed), the CC resistor R3, resistor R8, resistor R9, and the power supply terminal VB form a voltage division circuit. At this time, the triode Q3 is in a fully conducting state. Then, the voltage at the Drain terminal of the triode Q3 is 12V, that is, the voltage at the enable terminal of the Power IC is 12V, and it is successfully awakened to output a 5V level to supply power to the Power IC, and then it will participate in the function of CC resistor detection.

[0028] When the CC signal is connected (S1 is closed), the system is awakened, the VDD voltage is 5V, and the functions of the IO and ADC ports of the Power IC are normal, and the CC resistor detection function can be completed. In the actual application process, the ground offset between the charging gun and the vehicle may affect the stability of the CC resistor. When designing the software and hardware, it is necessary to consider that the resistance value of R3 may have an error range of ±10%. To ensure the detection accuracy and precision, the software is set to detect twice after S1 is closed to lock the resistance value gear of R3. The combined circuit of the GPIO port of the Power IC, the NPN-type triode Q1, and the PNP-type triode Q2 can control whether the resistor R1 is connected to the voltage division circuit. The two voltage division circuits are as follows: 1. When the GPIO port of the Power IC outputs a high level of 1, the triodes Q1 and Q2 are conducting, and the resistor R1 is short-circuited, that is, the resistor R1 = 0Ω. Therefore, the detection point voltage V3 = VD1 + VDDA*R3 / (R2 + R3). 2. When the GPIO port of the Power IC outputs a low level of 0, the triodes Q1 and Q2 are cut off, and the resistor R1 participates in the voltage division with a resistance value of 1KΩ. Therefore, the detection point voltage V3 = VD1 + VDDA*R3 / (R1 + R2 + R3). According to the voltage value of the detection point, the resistance value of the CC resistor can be calculated by the subsequent software.

[0029] The above is only a preferred embodiment of the present invention, and it does not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the content of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A charging gun CC resistance detection and wake-up circuit, characterized in that: It includes a wake-up circuit, a CC resistance detection circuit and a POWER IC. The wake-up circuit is electrically connected to the KEY_IN pin of the POWER IC. The CC resistance detection circuit is electrically connected to the ADC port of the POWERIC. When the charging gun is inserted, the wake-up circuit converts the input resistance signal into a voltage signal, and inputs the voltage signal to the POWER IC to wake it up and supply power. The POWER IC detects the CC resistance voltage signal through the CC resistance detection circuit, and can calculate the CC resistance value.

2. A charging gun CC resistance detection and wake-up circuit according to claim 1, characterized in that: The wake-up circuit includes a CC resistor R3, a terminal S1, a resistor R8, a resistor R9, a power supply VB, a capacitor C3, a field effect transistor Q3 and a power supply Power IC. One end of the terminal S1 is grounded through the CC resistor R3, and the other end of the terminal S1 is electrically connected to the power supply VB through the resistor R8 and the resistor R9 in sequence. The capacitor C3 is connected in parallel to both ends of the resistor R9, and the common end of the resistor R8 and the resistor R9 is electrically connected to the gate of the field effect transistor Q3. The common end of the resistor R9 and the power supply VB is electrically connected to the source of the field effect transistor Q3, and the drain of the field effect transistor Q3 is electrically connected to the enable end of the power supply Power IC. The output end of the power supply PowerIC is electrically connected to the power input end of the POWERIC.

3. A charging gun CC resistance detection and wake-up circuit according to claim 2, characterized in that: The CC resistance detection circuit includes a power supply VDD, a diode D1, a diode D3, a capacitor C1, a capacitor C5, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a transistor Q1 and a transistor Q2, wherein the resistor R3 is electrically connected to the cathode of the diode D1 through the terminal S1, the cathode of the diode D1 is grounded through the diode D3, the capacitor C5 is connected in parallel to both ends of the diode D3, and the anode of the diode D1 is electrically connected to the power supply VDD through the resistor R2 and the resistor R1 in sequence. The common end of the resistor R1 and the resistor R2 is electrically connected to the collector of the transistor Q2, the common end of the resistor R1 and the power supply VDD is electrically connected to the emitter of the transistor Q2, the emitter of the transistor Q2 is electrically connected to its base through the resistor R7, the base of the transistor Q2 is electrically connected to the collector of the transistor Q1 through the resistor R6, the emitter of the transistor Q1 is grounded, the emitter of the transistor Q1 is also electrically connected to its base through the resistor R5, and the base of the transistor Q1 is electrically connected to the input terminal GPIO of the POWER IC through the resistor R4; The anode of the diode D1 is also connected to the ground via the resistor R10 and the capacitor C1 in sequence, and the common end of the resistor R10 and the capacitor C1 is electrically connected to the acquisition end ADC of the POWER IC.

4. A charging gun CC resistance detection and wake-up circuit according to claim 2, characterized in that: The terminal S1 is a port for connecting the CC resistor to the ECU. When the charging gun is inserted, the terminal S1 is closed.

5. A charging gun CC resistance detection and wake-up circuit according to claim 2, characterized in that: The resistor R3 refers to the RC resistor on CC.

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