Dormancy wake-up circuit of vehicle-mounted charger, vehicle-mounted charger and automobile

Abstract

The utility model relates to a dormancy wake-up circuit of a vehicle-mounted charger, the vehicle-mounted charger and an automobile, and the circuit comprises a wake-up source interface which is used for connecting an external wake-up source; the detection and switching circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a comparator U and a controlled switch, the negative input end of the comparator U is connected with the wake-up source interface through the resistor R1, the negative input end of the comparator U is grounded through the resistor R2, the positive input end of the comparator U is connected with a reference VREF, and the negative input end of the comparator U is grounded through the resistor R4. The output end of the comparator U is connected with the control end of the controlled switch through a resistor R3, the control end of the controlled switch is further connected with the first end of the controlled switch through a resistor R4, and the connecting point of the first end of the controlled switch and the resistor R4 is used for being connected with a power supply. The second end of the controlled switch is used for being connected with a control unit of the vehicle-mounted charger. The power consumption of the whole vehicle in the dormant state can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted chargers, and in particular to a sleep awakening circuit of a vehicle-mounted charger, a vehicle-mounted charger and a car. Background Art

[0002] In the field of new energy vehicles, for the sleep and wake-up mechanism of the on-board charger, in order to achieve instant response by monitoring the CP signal or hard-line wake-up signal (KL15), the on-board charger needs to be connected to the continuous low-voltage power supply of the whole vehicle (i.e. the whole vehicle's normal power), see Figure 1 This design ensures that in sleep mode, a small part of the critical circuit remains active, dedicated to real-time monitoring of the CP signal or hard-wired wake-up signal to maintain the system's sensitivity to external wake-up requests. Although the power consumption of this monitoring circuit (i.e., the wake-up source detection circuit) is maintained at a low level of about 100 microamperes (μA), when the vehicle is in sleep mode for a long time, the accumulated power consumption may still have a significant impact on the vehicle battery.

[0003] Therefore, it is necessary to develop a new sleep wake-up circuit for an on-board charger, an on-board charger and a car. Utility Model Content

[0004] The utility model aims to provide a sleep awakening circuit of an on-board charger, an on-board charger and a vehicle, which can reduce the power consumption of the whole vehicle in a sleep state.

[0005] In a first aspect, a sleep wake-up circuit of a vehicle charger described in the utility model comprises: a wake-up source interface for connecting an external wake-up source;

[0006] A detection and switching circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a comparator U and a controlled switch, wherein the negative input terminal of the comparator U is connected to the wake-up source interface via the resistor R1, the negative input terminal of the comparator U is also grounded after passing through the resistor R2, the positive input terminal of the comparator U is connected to a reference VREF, the output terminal of the comparator U is connected to the control terminal of the controlled switch via the resistor R3, the control terminal of the controlled switch is also connected to the first terminal of the controlled switch via the resistor R4, and the connection point between the first terminal of the controlled switch and the resistor R4 is used to be connected to a power supply, and the second terminal of the controlled switch is used to be connected to a control unit of an on-board charger.

[0007] Optionally, the detection and switch circuit further includes a diode D1 connected in series between the wake-up source interface and the resistor R1, and an anode of the diode D1 is connected to the wake-up source interface.

[0008] Optionally, the detection and switching circuit further includes a diode D2 connected in series between the control unit and the resistor R1, and an anode of the diode D2 is connected to the control unit.

[0009] Optionally, the detection and switching circuit further includes a diode D3 connected in series between the second end of the controlled switch and the control unit, and an anode of the diode D3 is connected to the second end of the controlled switch.

[0010] Optionally, the detection and switching circuit further includes a diode D4, a cathode of the diode D4 is connected to a cathode of the diode D3, and an anode of the diode D4 is used to be connected to an auxiliary power supply.

[0011] Optionally, the controlled switch is a MOS transistor Q1 , and the control end of the MOS transistor Q1 is a gate, the first end of the MOS transistor Q1 is a source, and the second end of the MOS transistor Q1 is a drain.

[0012] In a second aspect, a vehicle-mounted charger described in the utility model includes a control unit and a charging unit, wherein the charging unit is connected to the control unit, and also includes a sleep wake-up circuit of the vehicle-mounted charger described in the utility model.

[0013] In a third aspect, a car described in the utility model adopts the on-board charger described in the utility model.

[0014] Beneficial effects of the utility model:

[0015] 1. The utility model reduces the power consumption of the whole vehicle in the dormant state.

[0016] 2. The utility model reduces the cost of the sleep wake-up circuit of the on-board charger. Compared with similar circuits commonly used in the market, this design reduces the cost by about 10% while maintaining high performance and reliability, bringing significant economic benefits to automobile manufacturers and end users, and improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a circuit diagram of a sleep wake-up circuit of an existing vehicle charger;

[0018] Figure 2 is a circuit diagram of the vehicle charger described in the embodiment of the present application;

[0019] Figure 3 is a circuit diagram of the vehicle-mounted charger described in the embodiment of the present application;

[0020] Among them: 1. Wake-up source interface, 2. Detection and switching circuit, 3. Power supply, 4. Auxiliary power supply, 5. Control unit, 6. Charging unit. DETAILED DESCRIPTION

[0021] The following will refer to the accompanying drawings and preferred embodiments to illustrate the implementation of the utility model. Those skilled in the art can understand other advantages and effects of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiments are only for illustrating the utility model, not for limiting the scope of protection of the utility model.

[0022] like Figure 3 As shown, in an embodiment of the present application, a sleep wake-up circuit of a vehicle charger includes a wake-up source interface 1 and a detection and switch circuit 2. Among them, the wake-up source interface 1 is used to connect an external wake-up source. The detection and switch circuit 2 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a comparator U and a controlled switch. The negative input end of the comparator U is connected to the wake-up source interface 1 through the resistor R1, and the negative input end of the comparator U is also grounded after passing through the resistor R2. The positive input end of the comparator U is connected to the reference VREF, and the output end of the comparator U is connected to the control end of the controlled switch through the resistor R3. The control end of the controlled switch is also connected to the first end of the controlled switch through the resistor R4, and the connection point between the first end of the controlled switch and the resistor R4 is used to connect to the power supply 3, and the second end of the controlled switch is used to connect to the control unit 5 of the vehicle charger.

[0023] like Figure 3 As shown, in a possible embodiment, the detection and switching circuit 2 also includes a diode D1 connected in series between the wake-up source interface 1 and the resistor R1, and the anode of the diode D1 is connected to the wake-up source interface 1. Among them, the anode of the diode D1 can be used as the wake-up source interface 1, which is used to receive the KL15 signal or the CP signal. Among them, the KL15 signal is a signal for starting the car, and the CP signal is a control guide signal, which is a key signal for communication and data exchange between the vehicle and the charging device during the charging process of the electric vehicle.

[0024] like Figure 3 As shown, in a possible embodiment, the detection and switch circuit 2 further includes a diode D2 connected in series between the control unit 5 and the resistor R1 , and an anode of the diode D2 is connected to the control unit 5 .

[0025] like Figure 3 As shown, in a possible embodiment, the detection and switching circuit 2 further includes a diode D3 connected in series between the second end of the controlled switch and the control unit 5, and the anode of the diode D3 is connected to the second end of the controlled switch.

[0026] like Figure 3As shown, in a possible embodiment, the detection and switch circuit 2 further includes a diode D4 , the cathode of the diode D4 is connected to the cathode of the diode D3 , and the anode of the diode D4 is used to be connected to the auxiliary power supply 4 .

[0027] like Figure 3 As shown, in a possible embodiment, the controlled switch is a MOS transistor Q1, and the control end of the MOS transistor Q1 is a gate, the first end of the MOS transistor Q1 is a source, and the second end of the MOS transistor Q1 is a drain. In one example, the MOS transistor Q1 is a PMOS transistor.

[0028] The working principle of the sleep wake-up circuit of this on-board charger is as follows:

[0029] 1. When the vehicle charger is in sleep mode and no wake-up source is connected:

[0030] 1. No power supply state: When there is no wake-up source (such as KL15 signal or CP signal) connected, the diode D1 is cut off due to no forward voltage, so the current cannot flow to the negative input of the comparator U through the resistor R1. Since there is no bias voltage at the negative input of the comparator U and there is a high reference VREF at the positive input, the output of the comparator U is high level, and the PMOS tube is turned on at a low level. Therefore, when the output of the comparator U is high level, the MOS tube Q1 is in the cut-off state.

[0031] 2. Isolation of the normal power of the whole vehicle: Since the MOS tube Q1 is cut off, that is, the detection and switch circuit 2 itself is disconnected, the normal power of the whole vehicle (that is, the power supply 3) cannot flow to the control unit 5 through the MOS tube Q1. The control unit 5 has no power supply, and the on-board charger is in a dormant state with no power consumption.

[0032] 2. When the vehicle charger is in sleep mode and connected to a wake-up source:

[0033] 1. Wake-up signal transmission: When the wake-up source is connected, the diode D1 is turned on, and the current flows through the resistor R1 to the negative input terminal of the comparator U. This current produces a voltage drop on the resistor R1. At this time, the voltage at the negative input terminal of the comparator U is higher than the positive input terminal, so the comparator U outputs a low level and the MOS tube Q1 is turned on.

[0034] 2. MOS tube Q1 is turned on: the output signal of the comparator U makes the gate voltage of MOS tube Q1 lower, and MOS tube Q1 is turned on, that is, the detection and switch circuit 2 itself is turned on. At this time, the power supply 3 flows to the control unit 5 through the MOS tube Q1, providing power to the control unit 5, and the on-board charger is awakened.

[0035] 3. When the vehicle charger is in the wake-up state, the wake-up source is disconnected:

[0036] 1. The wake-up signal disappears: When the wake-up source is disconnected, the diode D1 is cut off again, and there is no voltage at the negative input of the comparator U. The positive input of the comparator U is the reference VREF, which is greater than the voltage at the negative input. Therefore, the comparator U outputs a high level and the MOS tube Q1 is cut off, that is, the detection and switch circuit 2 itself is disconnected.

[0037] 2. Entering sleep mode: the power supply 3 is isolated again, the control unit 5 loses the supply of the power supply 3, and the on-board charger enters sleep mode.

[0038] When the on-board charger finally enters sleep mode, since the control unit 5 of the on-board charger is not connected to the power supply 3 , it can be approximately regarded as sleep mode without power consumption.

[0039] In the embodiment of the present application, the functions of each component in the detection and switching circuit 2 are as follows:

[0040] Diode D1 and diode D2: used for unidirectional conduction to ensure the correct transmission of the wake-up signal and prevent reverse current; D1 is the external wake-up path, and D2 is the internal wake-up channel (once the external wake-up is removed, it can be used to delay entering sleep). The unidirectional conduction performance of the diode is used to prevent interference between the two signals.

[0041] Resistors R1 and R2 constitute the input voltage divider network of comparator U to adjust the amplitude of the input signal.

[0042] Comparator U: compares the input signal with the reference VREF, and outputs a control signal to drive the MOS tube Q1.

[0043] MOS tube Q1: As an electronic switch, it controls whether the vehicle's normal power flows to the control unit.

[0044] Resistor R3, resistor R4: Resistor R3 provides a lower bias for the driving voltage of the MOS tube Q1, and resistor R4 is an upper bias voltage. When the comparator U outputs a low level, VGS (refers to the voltage difference between the gate (G) and the source (S) of the MOS tube Q1) and the voltage across the resistor R4 become negative voltages, driving the MOS tube Q1 to turn on; when the comparator U outputs a high level, VGS and the voltage across the resistor R4 become 0, and the MOS tube Q1 is disconnected.

[0045] Diode D3 and diode D4: Diode D3 is used to isolate the control unit 5 from the power supply 3, and diode D4 and auxiliary power supply 4 are combined to provide backup power for the control unit 7.

[0046] like Figure 2 As shown, in an embodiment of the present application, a vehicle-mounted charger includes a control unit 5 and a charging unit 6, wherein the charging unit 6 is connected to the control unit 5, and also includes a sleep wake-up circuit of the vehicle-mounted charger in the embodiment of the present application.

[0047] like Figure 2 As shown, in a possible embodiment, a vehicle-mounted charger further includes an auxiliary power supply 4, wherein the auxiliary power supply 4 is connected to the control unit 5, and the auxiliary power supply 4 is further connected to the control unit 5 and the charging unit 6 via a diode D4.

[0048] In the embodiment of the present application, the auxiliary power supply 4 has two functions:

[0049] 1. Supply power to the charging unit 5.

[0050] 2. As a backup power source for circuits other than the charging unit 5. When the power supply 3 fails or cannot provide sufficient power, the auxiliary power supply 4 sends an enable signal to the control unit 5, and the auxiliary power supply 4 supplies power to the control unit 5.

[0051] In an embodiment of the present application, a car adopts the on-board charger as in the embodiment of the present application.

[0052] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A sleep wake-up circuit for a vehicle charger, characterized in that: include: Wake-up source interface (1), used to connect an external wake-up source; A detection and switch circuit (2) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a comparator U and a controlled switch, wherein the negative input terminal of the comparator U is connected to the wake-up source interface (1) via the resistor R1, the negative input terminal of the comparator U is also connected to ground via the resistor R2, the positive input terminal of the comparator U is connected to a reference VREF, the output terminal of the comparator U is connected to the control terminal of the controlled switch via the resistor R3, the control terminal of the controlled switch is also connected to the first terminal of the controlled switch via the resistor R4, and the connection point between the first terminal of the controlled switch and the resistor R4 is used to connect to a power supply (3), and the second terminal of the controlled switch is used to connect to a control unit (5) of an on-board charger.

2. The sleep wake-up circuit of the vehicle charger according to claim 1, characterized in that: The detection and switch circuit (2) further comprises a diode D1 connected in series between the wake-up source interface (1) and the resistor R1, and an anode of the diode D1 is connected to the wake-up source interface (1).

3. The sleep wake-up circuit of the vehicle charger according to claim 2 is characterized in that: The detection and switch circuit (2) further comprises a diode D2 connected in series between the control unit (5) and the resistor R1, and an anode of the diode D2 is connected to the control unit (5).

4. The sleep wake-up circuit of the vehicle charger according to claim 1, characterized in that: The detection and switching circuit (2) further comprises a diode D3 connected in series between the second end of the controlled switch and the control unit (5), and the anode of the diode D3 is connected to the second end of the controlled switch.

5. The sleep wake-up circuit of the vehicle charger according to claim 4, characterized in that: The detection and switch circuit (2) further comprises a diode D4, wherein the cathode of the diode D4 is connected to the cathode of the diode D3, and the anode of the diode D4 is used to be connected to the auxiliary power supply (4).

6. The sleep wake-up circuit of the vehicle charger according to claim 1, characterized in that: The controlled switch is a MOS transistor Q1 , and the control end of the MOS transistor Q1 is a gate, the first end of the MOS transistor Q1 is a source, and the second end of the MOS transistor Q1 is a drain.

7. A vehicle-mounted charger, comprising a control unit (5) and a charging unit (6), wherein the charging unit (6) is connected to the control unit (5), characterized in that: It also includes a sleep wake-up circuit for the on-board charger as described in any one of claims 1 to 6.

8. A car, characterized in that: The on-vehicle charger as claimed in claim 7 is used.

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