Charging wake-up circuit and vehicle

Abstract

The utility model provides a charging wake-up circuit and a vehicle. In the charging wake-up circuit, the first end of a first switch unit is respectively connected with the first end of a first resistor, the first end of a first capacitor and the control end of a second switch unit, the second end is grounded, and the control end is connected with the input end of the charging wake-up circuit; the first end of the second switch unit is connected with the direct-current power supply, the second end of the first capacitor and the second end of the first resistor, and the second end of the second switch unit is connected with the first end of the second resistor and the first end of the third resistor; the first end of the third switch unit is connected with the second end of the third resistor and the output end of the charging wake-up circuit, the second end is grounded, and the control end is connected with the second end of the second resistor and the first end of the second capacitor; the second end of the second capacitor is grounded. According to the application, the switch unit is matched with the capacitor, the PWM signal is shaped into a short-time pulse wave, the BMS system is not frequently awakened, and the BMS system can enter a dormant state.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a charging wake-up circuit and a vehicle. Background Art

[0002] When a new energy vehicle is charged with an AC charging pile, the AC charging pile sends an AC charging confirmation signal to the vehicle-mounted BMS system to feedback the charging current and charging status. The charging confirmation signal is a PWM signal. At the same time, the vehicle-mounted BMS system usually uses the charging confirmation signal as a wake-up signal (for example, rising edge wake-up, falling edge wake-up, or low-effective wake-up) to wake up the dormant BMS system.

[0003] In the prior art, when the vehicle is fully charged and the charging contactor is disconnected, the BMS system needs to enter a dormant state to reduce power consumption. However, since the charging confirmation signal always exists and is a PWM signal, the BMS system will be frequently awakened after entering the dormant state, causing the BMS system to be unable to enter the dormant state. Utility Model Content

[0004] The embodiment of the utility model provides a charging wake-up circuit and a vehicle to solve the problem in the prior art that an AC charging confirmation signal is used to wake up a BMS system, but the BMS system cannot enter a dormant state.

[0005] In a first aspect, an embodiment of the utility model provides a charging wake-up circuit, wherein an input end of the charging wake-up circuit is used to input an AC charging confirmation signal sent by an AC charging pile, and an output end of the charging wake-up circuit is used to send a charging wake-up signal to a BMS system;

[0006] The charging wake-up circuit includes: a first switch unit, a second switch unit, a third switch unit, a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor;

[0007] A first switch unit, wherein a first end is respectively connected to the first end of the first resistor, the first end of the first capacitor and the control end of the second switch unit, a second end is grounded, and the control end is connected to the input end of the charging wake-up circuit;

[0008] A second switch unit, a first end of which is respectively connected to the DC power supply, the second end of the first capacitor and the second end of the first resistor, and a second end of which is respectively connected to the first end of the second resistor and the first end of the third resistor;

[0009] A third switch unit, a first end of which is respectively connected to the second end of the third resistor and the output end of the charging wake-up circuit, a second end of which is grounded, and a control end of which is respectively connected to the second end of the second resistor and the first end of the second capacitor;

[0010] The second terminal of the second capacitor is grounded;

[0011] Among them, the third switch unit is turned on at a high level, and the second switch unit is turned on at a low level.

[0012] Optionally, the first switch unit includes: a first switch tube and a fourth resistor;

[0013] The first end of the first switch tube is the first end of the first switch unit, the second end of the first switch tube is the second end of the first switch unit, and the control end of the first switch tube is connected to the first end of the fourth resistor;

[0014] The second end of the fourth resistor is the control end of the first switch unit.

[0015] Optionally, the first switch unit further includes: a fifth resistor;

[0016] The first end of the fifth resistor is connected to the control end of the first switch tube and the first end of the fourth resistor respectively;

[0017] A second terminal of the fifth resistor is grounded.

[0018] Optionally, the first switch tube is an NPN transistor;

[0019] The first end of the first switch tube is a collector, the second end of the first switch tube is an emitter, and the control end of the first switch tube is a base.

[0020] Optionally, the second switch unit includes: a second switch tube and a sixth resistor;

[0021] The first end of the second switch tube is the first end of the second switch unit, the second end of the second switch tube is the second end of the second switch unit, and the control end of the second switch tube is connected to the first end of the sixth resistor;

[0022] The second end of the sixth resistor is the control end of the second switch unit.

[0023] Optionally, the second switch tube is a PNP transistor;

[0024] The first end of the second switch tube is an emitter, the second end of the second switch tube is a collector, and the control end of the second switch tube is a base.

[0025] Optionally, the third switch unit includes: a third switch tube and a seventh resistor;

[0026] The first end of the third switch tube is the first end of the third switch unit, the second end of the third switch tube is the second end of the third switch unit, and the control end of the third switch tube is connected to the first end of the seventh resistor;

[0027] The second end of the seventh resistor is the control end of the third switch unit.

[0028] Optionally, the third switch unit further includes: an eighth resistor;

[0029] The first end of the eighth resistor is connected to the control end of the third switch tube and the first end of the seventh resistor respectively, and the second end of the eighth resistor is grounded.

[0030] Optionally, the third switch tube is an NPN transistor;

[0031] The first end of the third switch tube is a collector, the second end of the third switch tube is an emitter, and the control end of the third switch tube is a base.

[0032] In a second aspect, an embodiment of the utility model provides a vehicle, including: a BMS system, a charging information extraction circuit, and a charging wake-up circuit as provided in the first aspect of the above embodiment;

[0033] The input end of the charging wake-up circuit is used to receive the AC charging confirmation signal sent by the AC charging pile, and send a charging wake-up signal to the BMS system through the output end of the charging wake-up circuit;

[0034] The input end of the charging information extraction circuit is used to receive the AC charging confirmation signal, and send the AC charging information to the BMS system through the output end of the charging information extraction circuit.

[0035] The embodiment of the utility model provides a charging wake-up circuit and a vehicle. The input end of the charging wake-up circuit is used to input an AC charging confirmation signal sent by an AC charging pile, and the output end of the charging wake-up circuit is used to send a charging wake-up signal to a BMS system; the charging wake-up circuit includes: a first switch unit, a second switch unit, a third switch unit, a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor; the first switch unit, the first end is respectively connected to the first end of the first resistor, the first end of the first capacitor and the control end of the second switch unit, the second end is grounded, and the control end is connected to the input end of the charging wake-up circuit; the second switch unit, the first end is respectively connected to a DC power supply, the second end of the first capacitor and the second end of the first resistor, the second end is respectively connected to the first end of the second resistor and the first end of the third resistor; the third switch unit, the first end is respectively connected to the second end of the third resistor and the output end of the charging wake-up circuit, the second end is grounded, and the control end is respectively connected to the second end of the second resistor and the first end of the second capacitor; the second end of the second capacitor is grounded; wherein the third switch unit is high level turned on, and the second switch unit is low level turned on. The AC charging confirmation signal is a PWM signal. If the first switch unit is turned on at a high level, when the PWM signal output is a high level, the first switch unit is turned on, the second switch unit is turned on, the charging wake-up signal is switched to a high level, and the second capacitor is charged; when the voltage across the second capacitor reaches a preset voltage, the third switch unit is turned on, and the charging wake-up signal is switched to a low level; when the PWM signal is switched to a low level, the voltage across the first capacitor can still ensure that the second switch unit is turned on, the third switch unit remains turned on, and the charging wake-up signal is still a low level, and then the charging wake-up signal is always. Based on the circuit provided in the embodiment of the utility model, the AC charging confirmation signal is shaped into a short-time pulse signal, which can only wake up the BMS system once, and will not continue to wake up in the future, so that the BMS system can enter a dormant state when necessary, and will not be frequently woken up, thereby reducing system power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 It is a circuit structure diagram of a charging wake-up circuit provided by an embodiment of the utility model;

[0038] Figure 2 This is a waveform diagram of a charging wake-up signal provided by an embodiment of the utility model;

[0039] Figure 3 This is a circuit schematic diagram of a charging wake-up circuit provided by an embodiment of the utility model;

[0040] Figure 4 It is a structural diagram of a vehicle. DETAILED DESCRIPTION

[0041] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0042] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0043] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0044] Figure 1 This is a schematic diagram of a charging wake-up circuit provided by an embodiment of the utility model. Figure 1 The input end of the charging wake-up circuit is used to input the AC charging confirmation signal PWM1 sent by the AC charging pile, and the output end of the charging wake-up circuit is used to send a charging wake-up signal WAKE to the BMS system;

[0045] The charging wake-up circuit comprises: a first switch unit 11, a second switch unit 12, a third switch unit 13, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2 and a third resistor R3;

[0046] A first switch unit 11, a first end of which is respectively connected to the first end of the first resistor R1, the first end of the first capacitor C1 and the control end of the second switch unit 12, a second end of which is grounded, and a control end of which is connected to the input end of the charging wake-up circuit;

[0047] A second switch unit 12, a first end of which is respectively connected to the DC power supply, the second end of the first capacitor C1 and the second end of the first resistor R1, and a second end of which is respectively connected to the first end of the second resistor R2 and the first end of the third resistor R3;

[0048] A third switch unit 13, a first end of which is respectively connected to the second end of the third resistor R3 and the output end of the charging wake-up circuit, a second end of which is grounded, and a control end of which is respectively connected to the second end of the second resistor R2 and the first end of the second capacitor C2;

[0049] A second terminal of the second capacitor C2 is grounded;

[0050] The third switch unit 13 is turned on at a high level, and the second switch unit 12 is turned on at a low level.

[0051] refer to Figure 1 If the first switch unit 11 is turned on at a high level, when PWM1 has a rising edge and becomes a high level, the first switch unit 11 is turned on, the control end of the second switch unit 12 is at a low level, the second switch unit 12 is turned on at a low level, and the charging wake-up signal WAKE is switched to a high level; at the same time, the second capacitor C2 is charged, and when the voltage across the second capacitor C2 reaches a preset voltage, the third switch unit 13 is turned on, the charging wake-up signal WAKE is switched to a low level, and a short pulse signal appears in the charging wake-up signal WAKE. Among them, the duration of the charging wake-up signal WAKE is related to the first capacitor C1.

[0052] When the PWM signal is switched to a low level, the first switch unit 11 is disconnected, the voltage across the first capacitor C1 cannot change suddenly, the control end of the second switch unit 12 is still at a low level, the second switch unit 12 is turned on, the control end of the third switch unit 13 is still at a high level, the third switch unit 13 is still turned on, and the charging wake-up signal WAKE is at a low level. In this process, the first capacitor C1 is discharged through the first resistor R1, but its discharge cycle is relatively large, which can still ensure that the first switch unit 11 is disconnected and the charging wake-up signal WAKE continues to be at a low level.

[0053] When the PWM signal is switched to a high level, the first switch unit 11 is turned on, the first capacitor C1 is charged, the third switch unit 13 is still turned on, and the charging wake-up signal WAKE is still continuously at a low level. Figure 2 FIG. 4 shows a waveform diagram of a charging wake-up signal WAKE.

[0054] In the embodiment of the utility model, the AC charging confirmation signal PWM1 is shaped based on the above circuit, and the first rising edge or falling edge signal of the AC charging confirmation signal PWM1 is converted into a short-time pulse signal as a charging wake-up signal WAKE. The BMS signal is awakened only once when the charging plug of the AC charging pile is connected, and the BMS system will not be awakened again afterwards, thereby avoiding waking up the BMS system when it is dormant, thereby reducing the power consumption of the system.

[0055] In a possible implementation, the voltage of the DC power supply may be 12V.

[0056] In one possible implementation, reference Figure 3 , the first switch unit 11 may include: a first switch tube Q1 and a fourth resistor R4;

[0057] The first end of the first switch tube Q1 is the first end of the first switch unit 11, the second end of the first switch tube Q1 is the second end of the first switch unit 11, and the control end of the first switch tube Q1 is connected to the first end of the fourth resistor R4;

[0058] The second end of the fourth resistor R4 is the control end of the first switch unit 11 .

[0059] In the embodiment of the utility model, the first switch tube Q1 is used to form the first switch unit 11, and the AC charging confirmation signal PWM1 drives the first switch tube Q1 to be turned on and off through the fourth resistor R4, thereby realizing the turning on and off of the first switch unit 11. The circuit structure is simple, the number of components is small, and the component cost is low.

[0060] In one possible implementation, reference Figure 3 , the first switch unit 11 may further include: a fifth resistor R5;

[0061] The first end of the fifth resistor R5 is connected to the control end of the first switch tube Q1 and the first end of the fourth resistor R4 respectively;

[0062] A second terminal of the fifth resistor R5 is grounded.

[0063] In the embodiment of the utility model, a fifth resistor R5 may be further provided. The fourth resistor R4 and the fifth resistor R5 divide the voltage to provide a suitable control voltage for the first switch tube Q1.

[0064] In one possible implementation, reference Figure 3 , the first switch tube Q1 may be an NPN transistor;

[0065] The first end of the first switch tube Q1 is a collector, the second end of the first switch tube Q1 is an emitter, and the control end of the first switch tube Q1 is a base.

[0066] The first switch tube Q1 can be an NPN transistor, which is turned on at a high level. Figure 3 , is turned on when the AC charging confirmation signal PWM1 is at a high level, and identifies the rising edge of the AC charging confirmation signal PWM1.

[0067] In one possible implementation, reference Figure 3 , the second switch unit 12 may include: a second switch tube Q2 and a sixth resistor R6;

[0068] The first end of the second switch tube Q2 is the first end of the second switch unit 12, the second end of the second switch tube Q2 is the second end of the second switch unit 12, and the control end of the second switch tube Q2 is connected to the first end of the sixth resistor R6;

[0069] The second end of the sixth resistor R6 is the control end of the second switch unit 12 .

[0070] refer to Figure 3 In the embodiment of the utility model, the second switch tube Q2 can be used to implement the second switch unit 12, with a small number of components and low cost.

[0071] In one possible implementation, reference Figure 3 , the second switch tube Q2 can be a PNP type transistor;

[0072] The first end of the second switch tube Q2 is an emitter, the second end of the second switch tube Q2 is a collector, and the control end of the second switch tube Q2 is a base.

[0073] The second switch tube Q2 is a PNP transistor. When the first switch unit 11 is turned on, a large voltage difference is formed between the emitter and the base of the second switch tube Q2 to control the second switch tube Q2 to be turned on, thereby realizing the low-level conduction of the second switch unit 12.

[0074] In one possible implementation, reference Figure 3 , the third switch unit 13 may include: a third switch tube Q3 and a seventh resistor R7;

[0075] The first end of the third switch tube Q3 is the first end of the third switch unit 13, the second end of the third switch tube Q3 is the second end of the third switch unit 13, and the control end of the third switch tube Q3 is connected to the first end of the seventh resistor R7;

[0076] The second end of the seventh resistor R7 is the control end of the third switch unit 13 .

[0077] Like the first switch unit 11 , the third switch unit 13 is also formed by a third switch tube Q3 .

[0078] In one possible implementation, reference Figure 3 , the third switch unit 13 may further include: an eighth resistor R8;

[0079] A first end of the eighth resistor R8 is connected to the control end of the third switch tube Q3 and a first end of the seventh resistor R7 respectively, and a second end of the eighth resistor R8 is grounded.

[0080] The seventh resistor R7 and the eighth resistor R8 divide the voltage to provide a suitable control voltage for the third switch tube Q3.

[0081] In one possible implementation, reference Figure 3 , the third switch tube Q3 may be an NPN transistor;

[0082] The first end of the third switch tube Q3 is a collector, the second end of the third switch tube Q3 is an emitter, and the control end of the third switch tube Q3 is a base.

[0083] The third switch tube Q3 is an NPN transistor. When the voltage across the first capacitor C1 reaches a preset voltage, a certain voltage difference appears between the base and the emitter of the third switch tube Q3, and the third switch tube Q3 is turned on, realizing high-level on-control of the third switch unit 13.

[0084] refer to Figure 3 The charging wake-up circuit provided in the embodiment of the utility model is realized by only three switch tubes, two capacitors and eight resistors. The circuit structure is simple and ingenious. The shaping of the AC charging confirmation signal PWM1 can be realized by only a few devices. The number of devices is small and the cost is low. At the same time, since the number of devices is small and common, the circuit can be integrated.

[0085] Need to explain, Figure 2 For the corresponding Figure 3 The charging wake-up signal WAKE generated by the charging wake-up circuit shown. When the AC charging confirmation signal PWM1 has a rising edge, since the voltage of the first capacitor C1 cannot change suddenly, the charging wake-up signal WAKE rises slowly as the first capacitor C1 is charged, and the rising time is determined by the first capacitor C1, the first resistor R1 and the sixth resistor R6. The second capacitor C2 is charged, and when the voltage across the second capacitor C2 reaches the preset voltage, the charging wake-up signal WAKE switches to a low level, and the short-time pulse duration of the charging wake-up signal WAKE is determined by the second resistor R2, the seventh resistor R7, the eighth resistor R8 and the second capacitor C2. The third resistor R3 is a current limiting resistor.

[0086] Corresponding to the above embodiment, reference Figure 4 , the embodiment of the utility model further provides a vehicle, comprising: a BMS system 3, a charging information extraction circuit 2 and a charging wake-up circuit 1 provided in any aspect of the above embodiments;

[0087] The input end of the charging wake-up circuit 1 is used to receive the AC charging confirmation signal PWM1 sent by the AC charging pile, and send a charging wake-up signal WAKE to the BMS system 3 through the output end of the charging wake-up circuit 1;

[0088] The input end of the charging information extraction circuit 2 is used to receive the AC charging confirmation signal PWM1 , and send the AC charging information SIG to the BMS system 3 through the output end of the charging information extraction circuit 2 .

[0089] The charging information extraction circuit 2 is used to extract the charging information of the current charging confirmation signal PWM1, and is a conventional circuit, which will not be described in detail here.

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charging wake-up circuit, characterized in that: The input end of the charging wake-up circuit is used to input the AC charging confirmation signal sent by the AC charging pile, and the output end of the charging wake-up circuit is used to send a charging wake-up signal to the BMS system; The charging wake-up circuit includes: a first switch unit, a second switch unit, a third switch unit, a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor; The first switch unit has a first end connected to the first end of the first resistor, the first end of the first capacitor and the control end of the second switch unit respectively, a second end connected to the ground, and a control end connected to the input end of the charging wake-up circuit; The second switch unit has a first end connected to a DC power supply, a second end of the first capacitor and a second end of the first resistor, and a second end connected to a first end of the second resistor and a first end of the third resistor; The third switch unit has a first end connected to the second end of the third resistor and the output end of the charging wake-up circuit respectively, a second end connected to the ground, and a control end connected to the second end of the second resistor and the first end of the second capacitor respectively; The second terminal of the second capacitor is grounded; The third switch unit is turned on at a high level, and the second switch unit is turned on at a low level.

2. The charging wake-up circuit according to claim 1, characterized in that: The first switch unit includes: a first switch tube and a fourth resistor; The first end of the first switch tube is the first end of the first switch unit, the second end of the first switch tube is the second end of the first switch unit, and the control end of the first switch tube is connected to the first end of the fourth resistor; The second end of the fourth resistor is the control end of the first switch unit.

3. The charging wake-up circuit according to claim 2, characterized in that: The first switch unit further includes: a fifth resistor; The first end of the fifth resistor is respectively connected to the control end of the first switch tube and the first end of the fourth resistor; A second terminal of the fifth resistor is grounded.

4. The charging wake-up circuit according to claim 2, characterized in that: The first switch tube is an NPN type transistor; The first end of the first switch tube is a collector, the second end of the first switch tube is an emitter, and the control end of the first switch tube is a base.

5. The charging wake-up circuit according to any one of claims 1 to 4, characterized in that: The second switch unit includes: a second switch tube and a sixth resistor; The first end of the second switch tube is the first end of the second switch unit, the second end of the second switch tube is the second end of the second switch unit, and the control end of the second switch tube is connected to the first end of the sixth resistor; The second end of the sixth resistor is the control end of the second switch unit.

6. The charging wake-up circuit according to claim 5, characterized in that: The second switch tube is a PNP type transistor; The first end of the second switch tube is an emitter, the second end of the second switch tube is a collector, and the control end of the second switch tube is a base.

7. The charging wake-up circuit according to any one of claims 1 to 4, characterized in that: The third switch unit includes: a third switch tube and a seventh resistor; The first end of the third switch tube is the first end of the third switch unit, the second end of the third switch tube is the second end of the third switch unit, and the control end of the third switch tube is connected to the first end of the seventh resistor; The second end of the seventh resistor is the control end of the third switch unit.

8. The charging wake-up circuit according to claim 7, characterized in that: The third switch unit further includes: an eighth resistor; The first end of the eighth resistor is respectively connected to the control end of the third switch tube and the first end of the seventh resistor, and the second end of the eighth resistor is grounded.

9. The charging wake-up circuit according to claim 7, characterized in that: The third switch tube is an NPN transistor; The first end of the third switch tube is a collector, the second end of the third switch tube is an emitter, and the control end of the third switch tube is a base.

10. A vehicle, characterized in that: include: A BMS system, a charging information extraction circuit, and a charging wake-up circuit as claimed in any one of claims 1 to 9; The input end of the charging wake-up circuit is used to receive an AC charging confirmation signal sent by the AC charging pile, and send a charging wake-up signal to the BMS system through the output end of the charging wake-up circuit; The input end of the charging information extraction circuit is used to receive the AC charging confirmation signal, and send the AC charging information to the BMS system through the output end of the charging information extraction circuit.

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