Vehicle-mounted charger and new energy vehicle

Abstract

The invention provides a wake-up circuit of a charging controller, a vehicle-mounted charger and a new energy vehicle. The wake-up circuit comprises a first-stage charging circuit and a second-stage charging circuit. Wherein the first-stage charging circuit comprises a first capacitor, and the first-stage charging circuit charges the first capacitor and outputs a first charging voltage to the second-stage charging circuit under the condition that the input end of the first-stage charging circuit receives a high-level signal and the first capacitor is in an undercharged state; and under the condition that the input end receives a low-level signal, the first capacitor is discharged. The second-stage charging circuit comprises a second capacitor, the second-stage charging circuit charges the second capacitor and outputs an awakening signal to the charging controller when receiving the first charging voltage output by the first-stage charging circuit, the charging controller is awakened by the awakening signal, and the second-stage charging circuit charges the second capacitor. And charging the high-voltage battery of the vehicle in response to the charging control signal. By adopting the wake-up circuit, the scene coverage of the wake-up circuit can be improved, and the applicability is high.

Description

[0001] This application is a divisional application. The application number of the original application is 202110483741.X, and the original application date is April 30, 2021. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of electronic circuit technology, and in particular to a wake-up circuit of a charging controller, an on-board charger and a new energy vehicle. Background Art

[0003] On board charger (OBC) is also called vehicle charger. Figure 1a As shown, the on-board charger is used to convert the AC power of the AC charging pile into DC power, so as to charge the high-voltage battery of the vehicle in the new energy vehicle. Since the charging controller in the on-board charger is powered by a low-voltage battery, in order to reduce the power consumption of the low-voltage battery when the on-board charger is not working and increase the time the car can be stationary, a wake-up circuit is usually set between the AC charging pile and the charging controller to generate a rising edge starting from 0 according to the CP signal sent by the AC charging pile. The rising edge is used to wake up the charging controller, and then the charging controller charges the high-voltage battery of the vehicle according to the charging control signal sent by the AC charging pile.

[0004] At present, the existing technology adopts Figure 1b The wake-up circuit of the charging controller shown in the figure has an output voltage of 0v when the CP signal is 0. When the CP signal rises from 0 to a high level, the high level charges the capacitor C1, so that the output of the wake-up circuit generates a rising edge starting from 0v, and the rising edge is used to wake up the charging controller. However, when the CP initial signal is at a high level, the capacitor C1 is in a fully charged state. At this time, the output of the wake-up circuit is at a high level. When the CP signal changes from a high level to a pulse width modulation (PWM) wave, it cannot be guaranteed that the electric energy stored in the capacitor C1 can be completely released when the CP signal changes from a high level to a low level. Therefore, the wake-up circuit cannot generate a rising edge signal starting from 0 when the CP signal changes from a low level to a high level, and cannot ensure that the charging controller is effectively awakened, and has poor applicability. Summary of the invention

[0005] The present application provides a wake-up circuit of a charging controller, an on-board charger and a new energy vehicle, which can improve the scenario coverage of the wake-up circuit and have strong applicability.

[0006] In the first aspect, the present application provides a wake-up circuit for a charging controller, the wake-up circuit comprising a first-level charging circuit and a second-level charging circuit. The first-level charging circuit comprises a first capacitor, the input end of the first-level charging circuit is coupled with the input end of the wake-up circuit, the output end of the first-level charging circuit is coupled with the input end of the second-level charging circuit, the first-level charging circuit charges the first capacitor when a high-level signal is received at its input end and the first capacitor is not fully charged, and outputs a first charging voltage to the second-level charging circuit; when a low-level signal is received at its input end, the first capacitor is discharged. The second-level charging circuit comprises a second capacitor, the output end of the second-level charging circuit is coupled with the output end of the wake-up circuit and connected to the charging controller, the second-level charging circuit charges the second capacitor and outputs a wake-up signal to the charging controller when receiving the first charging voltage output by the first-level charging circuit, the charging controller is awakened by the wake-up signal, and charges the vehicle high-voltage battery in response to the charging control signal. Furthermore, it can be ensured that no matter whether the received CP signal of the wake-up circuit changes from an initial low-level signal to a high-level signal, or changes from an initial high-level signal to a PWM-level signal, the first capacitor can be kept in an uncharged state, and then the charging effect of the high-level signal on the first capacitor causes the charging current of the first capacitor to generate a rising edge signal starting from 0V when charging the second capacitor, thereby improving the scenario coverage of the wake-up circuit and enhancing its applicability.

[0007] In combination with the first aspect, in a first possible implementation manner, an input end of the wake-up circuit is connected to the AC charging pile, and the wake-up circuit receives a first level signal or a second level signal sent by the AC charging pile.

[0008] In combination with the first aspect, in a second possible implementation, the first-stage charging circuit further includes a first diode, wherein the positive electrode of the first capacitor is coupled to the input end of the first-stage charging circuit, the negative electrode of the first capacitor is connected to the output end of the first-stage charging circuit and the negative electrode of the first diode respectively, and the positive electrode of the first diode is connected to the reference ground. The first diode is used to form a discharge loop when the first capacitor is discharged.

[0009] In combination with the first aspect, in a third possible implementation, the first-stage charging circuit further includes a second diode, the cathode of the second diode is connected to the anode of the first capacitor, and the anode of the second diode is connected to the cathode of the first capacitor. The second switch tube can ensure that there is no negative voltage when the first capacitor is discharged.

[0010] In combination with the first aspect, in a fourth possible implementation, the first-stage charging circuit further includes a first resistor, one end of the first resistor is connected to the positive electrode of the first capacitor, and the other end of the first resistor is connected to the input end of the first-stage charging circuit. The first resistor can make the current in the wake-up circuit less than a preset current threshold, thereby effectively protecting various components in the wake-up circuit and extending their service life.

[0011] In combination with the first aspect, in a fifth possible implementation, the first resistor includes N1 resistors connected in series and / or in parallel. It can be understood that the resistance of the first resistor can be any value, thereby improving the flexibility of the wake-up circuit and enhancing its applicability.

[0012] In combination with the first aspect, in a sixth possible implementation, the first capacitor includes M1 capacitors connected in series and / or in parallel. It can be understood that the capacitance of the first capacitor can be any value, thereby improving the flexibility of the wake-up circuit and enhancing its applicability.

[0013] In combination with the first aspect, in a seventh possible implementation, the second-stage charging circuit further includes a third diode, wherein an anode of the third diode is connected to an input end of the second-stage charging circuit, and a cathode of the third diode is connected to an output end of the second-stage charging circuit and a positive electrode of the second capacitor, respectively. The third diode can prevent a discharge current of the second capacitor from flowing to the first-stage charging circuit when the second capacitor is discharged.

[0014] In combination with the first aspect, in an eighth possible implementation, the second-stage charging circuit further includes a second resistor, and two ends of the second resistor are respectively connected to two ends of the second capacitor. The second resistor is used to form a discharge circuit of the second capacitor when the second-stage charging circuit does not receive the charging voltage output by the first-stage charging circuit.

[0015] In combination with the first aspect, in a ninth possible implementation, the second resistor includes N2 resistors connected in series and / or in parallel. It can be understood that the resistance of the second resistor can be any value, which can improve the flexibility of the wake-up circuit and has strong applicability.

[0016] In combination with the first aspect, in a tenth possible implementation, the second capacitor includes M2 capacitors connected in series and / or in parallel. It can be understood that the capacitance of the second capacitor can be any value, which can improve the flexibility of the wake-up circuit and has strong applicability.

[0017] In combination with the first aspect, in an eleventh possible implementation manner, the first level signal is a high level signal in the PWM level signal, and the second level signal is a low level signal in the PWM level signal.

[0018] In a second aspect, the present application provides a vehicle-mounted charger, the input end of which is connected to an AC charging pile, and the output end of which is connected to a high-voltage battery of a vehicle. The vehicle-mounted charger includes the wake-up circuit and the charging controller described in the first aspect above, the input end of the wake-up circuit is coupled to the input end of the vehicle-mounted charger, and the output end of the charging controller is coupled to the output end of the vehicle-mounted charger.

[0019] In the third aspect, the present application provides a new energy vehicle, which includes an on-board charger, a vehicle high-voltage battery and a low-voltage battery. The input end of the on-board charger is connected to the low-voltage battery, and the output end of the on-board charger is connected to the vehicle high-voltage battery. The on-board charger includes the wake-up circuit and charging controller described in the first aspect above.

[0020] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1a It is a schematic diagram of the architecture of the vehicle AC charging system provided by the present application;

[0022] Figure 1b It is a structural schematic diagram of a wake-up circuit of a charging controller provided by the prior art;

[0023] Figure 2 is another schematic diagram of the architecture of the vehicle AC charging system provided by the present application;

[0024] Figure 3 It is a timing diagram of the CP signal sent by the power supply equipment;

[0025] Figure 4a It is a structural schematic diagram of a wake-up circuit of a charging controller provided by the present application;

[0026] Figure 4b is another structural schematic diagram of the wake-up circuit of the charging controller provided by the present application;

[0027] Figure 5a It is a structural schematic diagram of the on-board charger provided by the present application;

[0028] Figure 5b is another structural schematic diagram of the on-board charger provided by the present application;

[0029] Figure 6 It is a structural schematic diagram of the new energy vehicle provided in this application. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of this solution, Figure 2 Introduces the charging process of new energy vehicles. Figure 2 , Figure 2 is another schematic diagram of the architecture of the vehicle AC charging system provided by this application. Figure 2 As shown, the vehicle AC charging system includes a power supply device and a new energy vehicle. The charging cable (corresponding to Figure 2 When ①-④) in the figure is not connected to the vehicle socket provided by the new energy vehicle, the voltage at CC is 12v and there is no voltage at CP. After the power supply socket is connected to the power supply device (i.e., the connection at ⑦), the switch S1 is turned on 12v, and the voltage at CP is 12v. After the charging gun is inserted into the vehicle charging port, it can be determined whether the charging gun has been inserted into the vehicle charging port by detecting whether the voltage at detection point 3 is 12v. If the voltage at detection point 3 is no longer 12v, it can be determined that the charging gun has been inserted into the vehicle charging port. Among them, the function of resistor R4 is to detect whether the charging gun is inserted in place. If not, the switch S3 (located at the charging gun) is disconnected, and the resistor R4 and RC form a series circuit. Therefore, the on-board charger can determine whether the charging gun is inserted in place through detection point 3. After the charging gun is inserted into the vehicle charging port, the 12v voltage provided by the power supply control device reaches detection point 1 and detection point 2 in turn through S1 and R1, and then is grounded through R3 to form a loop. At this time, the voltage at detection point 1 and detection point 2 is no longer 12v, but 9v. When the power supply control device detects that the voltage at detection point 1 is 9v, switch S1 changes from 12v connection to PWM signal connection. At this time, a duty cycle signal changing from 9v to -12v will appear at detection point 1 and detection point 2, which confirms that the charging gun is connected. After that, switch S2 is closed, and the voltage at detection point 2 changes from 9v to 6v, and the on-board charger confirms that charging is possible. After the CP signal stabilizes at 6v, relays K1 and K2 of the power supply equipment are closed, and the AC power provided by the power supply equipment is input into the on-board charger through the vehicle charging port. The on-board charger converts the AC power into DC power to charge the vehicle's high-voltage battery.

[0031] This application mainly introduces the implementation process of waking up the charging controller by generating a rising edge signal starting from 0 according to the received CP signal in two scenarios: the first time the charging gun is plugged in and the charging is interrupted and the charging gun is not unplugged. For the convenience of introduction, please refer to Figure 3 , Figure 3 This is a timing diagram of the CP signal sent by the power supply equipment. Figure 2 and Figure 3 It can be seen that Figure 3 The timing diagram of the CP signal shown is Figure 2 The power-on timing diagram at the detection point 2 shown in the figure includes three stages: confirming connection / readiness, energy transfer, and ending shutdown. The first charging gun plugging scenario in this application corresponds to Figure 3In scenario 1, when the charging gun is not inserted into the vehicle charging port, the initial level signal at detection point 2 is a low level signal (corresponding to the voltage of 0v in scenario 1). When the charging gun is inserted into the vehicle charging port, the level signal at detection point 2 changes from a low level signal to a high level signal of 9v; charging is interrupted and the charging scenario without removing the gun corresponds to Figure 3 In scene 2, the initial level signal at detection point 2 is a high level signal (corresponding to the high level signal of 9v in scene 2), and then the level signal at detection point 2 changes from a high level signal of 9v to a PWM level signal of 9v.

[0032] See also Figure 4a , Figure 4a 1 is a schematic diagram of a structure of a wake-up circuit of a charging controller provided in the present application. Figure 4a As shown, the wake-up circuit 10 includes a first-level charging circuit 101 and a second-level charging circuit 102. The input end of the first-level charging circuit 101 is coupled to the input end of the wake-up circuit 10, the output end of the first-level charging circuit 101 is connected to the input end of the second-level charging circuit 102, and the output end of the second-level charging circuit 102 is coupled to the output end of the wake-up circuit 10 and then connected to the charging controller 11.

[0033] The first-stage charging circuit 101 includes a first capacitor C1. Optionally, the first-stage charging circuit 101 may also include a first resistor R1 and a first diode D1, wherein one end of the first resistor R1 is connected to the input end of the first-stage charging circuit 101, the other end of the first resistor R1 is connected to the positive electrode of the first capacitor C1, the negative electrode of the first capacitor C1 is respectively connected to the output end of the first-stage charging circuit 101 and the negative electrode of the first diode D1, and the positive electrode of the first diode D1 is connected to the reference ground. Optionally, the first capacitor includes M1 capacitors connected in series and / or in parallel, and the first resistor includes N1 resistors connected in series and / or in parallel, wherein M1 and N1 are both positive integers.

[0034] The second-stage charging circuit 102 includes a second capacitor C2. Optionally, the second-stage charging circuit 102 may also include a third diode D2 and a second resistor R2, wherein the positive electrode of the third diode D2 is connected to the input end of the second-stage charging circuit 102, the negative electrode of the third diode D2 is respectively connected to the output end of the second-stage charging circuit 102 and the positive electrode of the second capacitor C2, the negative electrode of the second capacitor C2 is connected to the reference ground, and the second capacitor C2 is connected in parallel with the second resistor. Optionally, the second capacitor includes M2 capacitors connected in series and / or in parallel, and the second resistor includes N2 resistors connected in series and / or in parallel, wherein M2 and N2 are both positive integers.

[0035] For scenario 1, when the CP signal sent by the AC charging pile received at the input end of the first-level charging circuit 101 is a second-level signal (i.e., a low-level signal), the first capacitor C1 and the second capacitor C2 are both in an uncharged state, and the second-level charging circuit 102 outputs a low-level signal (i.e., 0v). Afterwards, when the CP signal received at the input end of the first-level charging circuit 101 is a first-level signal (i.e., a high-level signal), the first capacitor C1 starts to charge, and the charging path is R1, C1, D2, C2 and R2, that is, the first-level charging circuit 101 outputs the first charging voltage to the second-level charging circuit 102, and the second-level charging circuit 102 charges the second capacitor C2 when receiving the first charging voltage, and outputs a wake-up signal to the charging controller 11, that is, a rising edge signal starting from 0v.

[0036] It can be understood that for scenario 1, since the initial states of the first capacitor C1 and the second capacitor C2 are both uncharged, when a high-level signal is received at the input end of the first-level charging circuit 101, the high-level signal charges the first capacitor C1, causing the charging current of the first capacitor C1 to generate a rising edge signal starting from 0v when flowing through the second capacitor C2 and the second resistor R2.

[0037] For scenario 2, when the CP signal received at the input end of the first-stage charging circuit 101 is a first level signal (i.e., a high level signal) and the first capacitor C1 is in a fully charged state, the wake-up circuit 10 is in a stable state, i.e., there is no current in the wake-up circuit 10, so the first-stage charging circuit 101 stops outputting the first charging voltage to the second-stage charging circuit 102. At this time, the second-stage charging circuit 102 no longer receives the first charging voltage output by the first-stage charging circuit 101, i.e., there is no current in the second-stage charging circuit 102, and the second-stage charging circuit 102 outputs a low level signal (i.e., 0v). Afterwards, when the CP signal received at the input end of the first-stage charging circuit 101 is a PWM level signal, since the starting part of the PWM signal is a low level signal, the first capacitor C1 is discharged, and the discharge path is C1, R1, CP signal and D1. At this time, there is still no current in the second-stage charging circuit 102, and the second-stage charging circuit 102 still outputs a low level signal (i.e., 0v). Afterwards, when the low-level signal of the PWM level signal at the input end of the first-level charging circuit 101 is changed to a high-level signal, that is, when a high-level signal is received at the input end of the first-level charging circuit 101 and the first capacitor C1 is not fully charged, the first capacitor C1 starts to charge again, and the charging path is R1, C1, D2, C2 and R2, that is, the first-level charging circuit 101 outputs the first charging voltage to the second-level charging circuit 102 again, and the second-level charging circuit 102 charges the second capacitor C2 when receiving the first charging voltage, and outputs a wake-up signal to the charging controller 11, that is, a rising edge signal starting from 0v.

[0038] It can be understood that for scenario 2, since the initial state of the first capacitor C1 is a fully charged state, the output voltage of the wake-up circuit 10 is 0v at this time. When the input end of the first-level charging circuit 101 receives a PWM level signal with a low-level signal at the beginning, the first capacitor C1 is first discharged when the signal is low-level. At this time, the output voltage of the wake-up circuit 10 is still 0v. After that, the high-level signal charges the first capacitor C1, so that the charging current of the first capacitor C1 generates a rising edge signal starting from 0v when flowing through the second capacitor C2 and the second resistor R2.

[0039] In the embodiment of the present application, the wake-up circuit 10 detects the CP signal received at its input end. Regardless of whether the CP signal is a flip from a low-level signal to a high-level signal, or a change from a high-level signal to a PWM level signal, the wake-up circuit 10 can output a rising edge signal starting from 0v, thereby improving the scenario coverage of the wake-up circuit 10 and having strong applicability.

[0040] Further, Figure 4aThe first stage charging circuit 101 in the wake-up circuit 10 shown may also include a second diode, see Figure 4b Another structural schematic diagram of the wake-up circuit of the charging controller shown in FIG. Figure 4b As shown, the cathode of the second diode D3 is connected to the anode of the first capacitor C1, and the anode of the second diode D3 is connected to the cathode of the first capacitor C1, so that there is no negative voltage when the first capacitor C1 is discharged.

[0041] here, Figure 4b The specific implementation methods of the wake-up circuit 10 outputting the wake-up signal in scenario 1 and scenario 2 are respectively as follows: Figure 4a The specific implementation methods of the wake-up circuit 10 shown in the figure outputting the wake-up signal in scenario 1 and scenario 2 are the same, which will not be repeated here.

[0042] In the embodiment of the present application, the wake-up circuit 10 detects the CP signal received at its input end. Regardless of whether the CP signal is a flip from a low-level signal to a high-level signal, or a change from a high-level signal to a PWM level signal, the wake-up circuit 10 can output a rising edge signal starting from 0v, thereby improving the scenario coverage of the wake-up circuit 10 and having strong applicability.

[0043] See also Figure 5a , Figure 5a Schematic diagram of the structure of the vehicle charger provided by this application. Figure 5a As shown, the on-board charger 1 includes a wake-up circuit 10 and a charging controller 11, the input end of the wake-up circuit 10 is coupled with the input end of the on-board charger 1, and the output end of the wake-up circuit 10 is connected to the input end 11 of the charging controller. The wake-up circuit 10 includes a first-level charging circuit 101 and a second-level charging circuit 102, the input end of the first-level charging circuit 101 is coupled with the input end of the wake-up circuit 10, the output end of the first-level charging circuit 101 is connected to the input end of the second-level charging circuit 102, and the output end of the second-level charging circuit 102 is coupled with the output end of the wake-up circuit 10 and then connected to the input end of the charging controller 11.

[0044] The first-stage charging circuit 101 includes a first capacitor C1. Optionally, the first-stage charging circuit 101 may also include a first resistor R1 and a first diode D1, wherein one end of the first resistor R1 is connected to the input end of the first-stage charging circuit 101, the other end of the first resistor R1 is connected to the positive electrode of the first capacitor C1, the negative electrode of the first capacitor C1 is respectively connected to the output end of the first-stage charging circuit 101 and the negative electrode of the first diode D1, and the positive electrode of the first switch tube D1 is connected to the reference ground. Optionally, the first capacitor includes M1 capacitors connected in series and / or in parallel, and the first resistor includes N1 resistors connected in series and / or in parallel, wherein M1 and N1 are both positive integers.

[0045] The second-stage charging circuit 102 includes a second capacitor C2. Optionally, the second-stage charging circuit 102 may also include a third diode D2 and a second resistor R2, wherein the positive electrode of the third diode D2 is connected to the input end of the second charging circuit 102, the negative electrode of the third diode D2 is respectively connected to the output end of the second-stage charging circuit 102 and the positive electrode of the second capacitor C2, the negative electrode of the second capacitor C2 is connected to the reference ground, and the second capacitor C2 is connected in parallel with the second resistor. Optionally, the second capacitor includes M2 capacitors connected in series and / or in parallel, and the second resistor includes N2 resistors connected in series and / or in parallel, wherein M2 and N2 are both positive integers.

[0046] Here, the specific implementation methods of the wake-up circuit 10 outputting the wake-up signal in scenario 1 and scenario 2 are respectively as follows: Figure 4a The specific implementation methods of the wake-up circuit 10 shown in the figure outputting the wake-up signal in scenario 1 and scenario 2 are the same, which will not be repeated here.

[0047] Afterwards, after receiving the wake-up signal output by the wake-up circuit 10, the charging controller 11 is awakened according to the wake-up signal, and then charges the vehicle high-voltage battery according to the charging control signal sent by the AC charging pile. Specifically, the charging controller 11 can determine the size of the charging current output to the vehicle high-voltage battery according to the duty cycle of the PWM level signal included in the charging control signal.

[0048] In the embodiment of the present application, the wake-up circuit 10 detects the CP signal received at its input end. Regardless of whether the CP signal is a flip from a low-level signal to a high-level signal, or a change from a high-level signal to a PWM-level signal, the wake-up circuit 10 can output a rising edge signal starting from 0v, thereby ensuring that the charging controller 11 is effectively awakened. In other words, in addition to being able to effectively wake up the charging controller 11 when the charging gun is inserted, the wake-up circuit 10 can also effectively wake up the charging controller 11 without having to re-plug the charging gun after charging fails, thereby avoiding the situation where the charging gun needs to be unplugged and re-plugged to charge after charging is interrupted, thereby improving the scene coverage of the on-board charger 1 and the user experience, and having strong applicability.

[0049] Further, Figure 5a The first stage charging circuit 101 in the vehicle charger 1 shown may also include a second diode, see Figure 5b Another structural schematic diagram of the on-board charger is shown in FIG. Figure 5b As shown, the cathode of the second diode D3 is connected to the anode of the first capacitor C1, and the anode of the second diode D3 is connected to the cathode of the first capacitor C1, so that there is no negative voltage when the first capacitor C1 is discharged.

[0050] here, Figure 5bThe specific implementation methods of the wake-up circuit 10 outputting the wake-up signal in scenario 1 and scenario 2 are respectively as follows: Figure 4a The specific implementation methods of the wake-up circuit 10 shown in the figure outputting the wake-up signal in scenario 1 and scenario 2 are the same, which will not be repeated here.

[0051] Afterwards, after receiving the wake-up signal output by the wake-up circuit 10 , the charging controller 11 is awakened according to the wake-up signal, and then charges the vehicle high-voltage battery according to the charging control signal sent by the AC charging pile.

[0052] In the embodiment of the present application, the wake-up circuit 10 detects the CP signal received at its input end. Regardless of whether the CP signal is a flip from a low-level signal to a high-level signal, or a change from a high-level signal to a PWM-level signal, the wake-up circuit 10 can output a rising edge signal starting from 0v, thereby ensuring that the charging controller 11 is effectively awakened. In other words, in addition to being able to effectively wake up the charging controller 11 when the charging gun is inserted, the wake-up circuit 10 can also effectively wake up the charging controller 11 without having to re-plug the charging gun after charging fails, thereby avoiding the situation where the charging gun needs to be unplugged and re-plugged to charge after charging is interrupted, thereby improving the scene coverage of the on-board charger 1 and the user experience, and having strong applicability.

[0053] See also Figure 6 , Figure 6 This is a schematic diagram of the structure of the new energy vehicle provided by this application. Figure 6 As shown, the new energy vehicle 2 includes a vehicle high-voltage battery 21, an on-board charger 22 and a low-voltage battery 23, an input end of the on-board charger 22 is connected to the low-voltage battery 23, and an output end of the on-board charger 22 is connected to the vehicle high-voltage battery 21, wherein the on-board charger 22 includes a wake-up circuit 221 and a charging controller 222, an input end of the wake-up circuit 221 is connected to another input end of the on-board charger 22, and an output end of the wake-up circuit 221 is connected to the charging controller 222.

[0054] Here, the wake-up circuit 221 can be Figure 4a The wake-up circuit 10 shown may also be Figure 4b The specific implementation methods of the wake-up circuit 10 and the wake-up circuit 221 outputting the wake-up signal in scene 1 and scene 2 are respectively as follows: Figure 4a The specific implementation methods of the wake-up circuit 10 shown in the figure outputting the wake-up signal in scenario 1 and scenario 2 are the same, which will not be repeated here.

[0055] Afterwards, after receiving the wake-up signal output by the wake-up circuit 221, the charging controller 222 is awakened according to the wake-up signal, and then charges the vehicle high-voltage battery 21 according to the charging control signal sent by the AC charging pile. Specifically, the charging controller 222 can determine the size of the charging current output to the vehicle high-voltage battery 21 according to the duty cycle of the PWM level signal contained in the charging control signal sent by the AC charging pile, thereby realizing the charging of the new energy vehicle 2.

[0056] In the embodiment of the present application, the wake-up circuit 221 detects the CP signal received at its input end. Regardless of whether the CP signal is a flip from a low-level signal to a high-level signal, or a change from a high-level signal to a PWM level signal, the wake-up circuit 221 can output a rising edge signal starting from 0v, thereby ensuring that the charging controller 222 is effectively awakened, improving the scenario coverage of the wake-up circuit 221, thereby reducing the power consumption of the low-voltage battery, and increasing the time that the car can be stationary, and has strong applicability.

[0057] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle charger, characterized in that: The on-board charger includes a wake-up circuit and a charger controller. The wake-up circuit includes an input end and an output end. The wake-up circuit is used to receive a CP signal output from an AC charging pile through the input end and output a wake-up signal to the charging controller through the output end. The wake-up signal is used to wake up the charger controller so that the charger controller controls the on-board charger to receive power from the AC charging pile and charge the vehicle high-voltage battery. The wake-up circuit includes a first capacitor and a second capacitor, one end of the first capacitor is connected to the input end, the other end of the first capacitor is connected to one end of the second capacitor, the one end of the second capacitor is connected to the output end, and the other end of the second capacitor is grounded; After the CP signal is switched from a low level signal to a high level signal, the CP signal charges the first capacitor and the second capacitor so that the output end outputs the wake-up signal; After the CP signal is switched from a high level signal to a PWM signal, the first capacitor is discharged when the PWM signal is at a low level, and after the PWM signal is switched from a low level to a high level, the CP signal charges the first capacitor and the second capacitor so that the output end outputs the wake-up signal.

2. The vehicle-mounted charger according to claim 1, characterized in that: The wake-up circuit further includes a first resistor, one end of the first resistor is connected to the one end of the first capacitor, and the other end of the first resistor is connected to the input end.

3. The vehicle-mounted charger according to claim 1 or 2, characterized in that: The wake-up circuit further includes a first diode, the other end of the first capacitor is connected to the cathode of the first diode, and the anode of the first diode is grounded.

4. The vehicle-mounted charger according to any one of claims 1 to 3, characterized in that: The wake-up circuit further includes a second resistor, and two ends of the second resistor are respectively connected to two ends of the second capacitor.

5. The vehicle-mounted charger according to any one of claims 1 to 4, characterized in that: The wake-up circuit further includes a third diode, wherein the other end of the first capacitor is connected to the one end of the second capacitor through the third diode.

6. The vehicle-mounted charger according to claim 5, characterized in that: When the PWM signal is at a low level, the first capacitor is discharged through a discharge path formed by the input end, the first resistor, the first capacitor, and the first diode.

7. The vehicle-mounted charger according to claim 5, characterized in that: After the CP signal is switched from a low level signal to a high level signal or after the PWM signal is switched from a low level to a high level, the CP signal charges the second capacitor through a charging path formed by the first resistor, the first capacitor, the third diode, and the second resistor so that the output end outputs a wake-up signal to the charging controller.

8. The vehicle-mounted charger according to any one of claims 1 to 7, characterized in that: The wake-up circuit further includes a second diode, an anode of the second diode is connected to the other end of the first capacitor, and a cathode of the second diode is connected to the one end of the first capacitor.

9. The vehicle-mounted charger according to any one of claims 1 to 8, characterized in that: The wake-up signal is a rising edge signal starting from 0V.

10. A new energy vehicle, characterized in that: The new energy vehicle comprises an on-board charger and a vehicle high voltage voltage as described in any one of claims 1 to 9, wherein the on-board charger is used to receive power from an AC charging pile and charge the vehicle high voltage battery.

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