Power supply circuit of vehicle, charger and relay

Abstract

According to the power supply circuit of the vehicle, the charger and the relay, the first signal is sent to the first power supply circuit through the control circuit, and the first power supply circuit outputs the first voltage provided by the first power supply according to the first signal so as to drive the relay to be switched on. After the relay is switched on, the control circuit stops sending the first signal to the first power supply circuit and sends the second signal to the second power supply circuit, the second power supply circuit outputs a second voltage provided by the second power supply according to the second signal, and the power supply voltage of the relay is switched from the first voltage to the second voltage smaller than the first voltage. And the relay is kept in an on state. Therefore, the power supply circuit can provide the smaller second voltage for the relay after the relay is switched on, so that the relay can be kept in a switched-on state, the power supply voltage of the relay can be reduced, the coil power consumption of the relay is reduced, the heating of the relay is reduced, the temperature of the relay is reduced, and the service life of the relay is prolonged.

Description

Technical Field

[0001] This application relates to the field of power supply technology, specifically to a power supply circuit for a vehicle, a charger, and a relay. Background Technology

[0002] The main impact of power relays on equipment circuits is on power consumption and heat generation. This is because, on the one hand, the power relay needs to be driven to engage or disengage, and on the other hand, it needs to maintain this engaged or disengaged state. In current technology, a rated voltage is applied to the relay coil to drive the relay to engage or disengage. When the relay is closed, a large current flows for an extended period, causing the control coil to overheat significantly and the relay to consume a large amount of power. For relays in vehicle chargers, if the control coil overheats significantly and the relay consumes a large amount of power, it will affect the lifespan of the relay, and consequently, the lifespan of the charger. Utility Model Content

[0003] In view of this, this application provides a power supply circuit for a vehicle, a charger, and a relay, which reduces the power consumption and temperature of the relay when it is continuously conducting.

[0004] This application provides a vehicle, including a charger, a first power source, and a second power source. The charger includes a relay and a power supply circuit. When the relay is in a conducting state, the charger outputs electrical energy through the relay to charge the vehicle. The power supply circuit includes: a first power supply circuit, the input terminal of which is connected to the first power source, and the output terminal of which is connected to the control coil of the relay; a second power supply circuit, the input terminal of which is connected to the second power source, and the output terminal of which is connected to the control coil of the relay; and a control circuit, which is connected to the first power supply circuit and the second power supply circuit. The control circuit is used to send a first signal to the first power supply circuit and a second signal to the second power supply circuit. The first power supply circuit is used to output a first voltage provided by the first power source to the control coil according to the first signal, and the first voltage is used to drive the relay to conduct. The second power supply circuit is used to output a second voltage provided by the second power source to the control coil according to the second signal, and the second voltage is used to keep the relay in a conducting state. The second voltage is less than the first voltage.

[0005] In one embodiment, the first power supply circuit includes a first switch, a first end of which is connected to a first power source, and a second end of which is connected to a control coil; the first switch is turned on according to a first signal.

[0006] In one embodiment, the first power supply circuit further includes a second switch, the first end of which is connected to the first power supply via the second switch; wherein the second switch is turned on when the first power supply circuit outputs a first voltage.

[0007] In one embodiment, the first power supply circuit further includes a third switch, the control terminal of the third switch is connected to the control circuit, the first terminal of the third switch is connected to the control terminal of the first switch, and the second terminal of the third switch is grounded or connected to the first power supply; the control circuit is used to send a first signal to the control terminal of the third switch, and the third switch is turned on or off according to the first signal to turn on the first switch.

[0008] In one embodiment, the first power supply circuit further includes a first diode and a first bias resistor; the second terminal of the first switch is connected to the control coil through the first diode; the first terminal of the first bias resistor is connected to the first power supply, and the second terminal of the first bias resistor is connected to the control terminal of the second switch.

[0009] In one embodiment, the second power supply circuit includes a fourth switch, the first end of which is connected to the second power supply, and the second end of which is connected to a control coil. The fourth switch is turned on according to a second signal.

[0010] In one embodiment, the second power supply circuit further includes a fifth switch, the control terminal of the fifth switch is connected to the control circuit, the first terminal of the fifth switch is connected to the control terminal of the fourth switch, and the second terminal of the fifth switch is grounded or connected to the second power supply; the control circuit is used to send a second signal to the control terminal of the fifth switch, and the fifth switch is turned on or off according to the second signal to turn on the fourth switch.

[0011] In one embodiment, the second power supply circuit further includes a second diode and a second bias resistor; the second terminal of the fourth switch is connected to the control coil through the second diode; the first terminal of the second bias resistor is connected to the first terminal of the fourth switch, and the second terminal of the second bias resistor is connected to the control terminal of the fourth switch.

[0012] A second aspect of this application provides a charger, including a relay and a power supply circuit; when the relay is in a conducting state, the charger outputs electrical energy through the relay to charge a device to be charged; the power supply circuit includes: a first power supply circuit, the input terminal of which is connected to a first power source, and the output terminal of which is connected to the control coil of the relay; a second power supply circuit, the input terminal of which is connected to a second power source, and the output terminal of which is connected to the control coil of the relay; and a control circuit, which is connected to the first power supply circuit and the second power supply circuit, and is used to send a first signal to the first power supply circuit and a second signal to the second power supply circuit; wherein, the first power supply circuit is used to output a first voltage provided by the first power source to the control coil according to the first signal, and the first voltage is used to drive the relay to conduct; the second power supply circuit is used to output a second voltage provided by the second power source to the control coil according to the second signal, and the second voltage is used to keep the relay in a conducting state; wherein, the second voltage is less than the first voltage.

[0013] A third aspect of this application provides a power supply circuit for a relay, comprising: a first power supply circuit, the input terminal of which is connected to a first power source, and the output terminal of which is connected to the control coil of the relay; a second power supply circuit, the input terminal of which is connected to a second power source, and the output terminal of which is connected to the control coil of the relay; and a control circuit connected to the first and second power supply circuits, the control circuit being configured to send a first signal to the first power supply circuit and a second signal to the second power supply circuit; wherein the first power supply circuit is configured to output a first voltage provided by the first power source to the control coil according to the first signal, the first voltage being used to drive the relay to conduct; the second power supply circuit is configured to output a second voltage provided by the second power source to the control coil according to the second signal, the second voltage being used to keep the relay in a conducting state; wherein the second voltage is less than the first voltage.

[0014] In this embodiment, a control circuit sends a first signal to a first power supply circuit. The first power supply circuit outputs a first voltage based on the first signal to drive the relay to conduct. After the relay is turned on, the control circuit stops sending the first signal to the first power supply circuit and sends a second signal to a second power supply circuit. The second power supply circuit outputs a second voltage based on the second signal, and the relay's supply voltage switches from the first voltage to a second voltage lower than the first voltage, keeping the relay in a conducting state. Therefore, the power supply circuit can provide a smaller second voltage to the relay after it is turned on, which not only keeps the relay in a conducting state but also reduces the relay's supply voltage, thereby reducing the relay's coil power consumption, reducing heat generation, lowering the relay's temperature, and ultimately extending the relay's lifespan. Attached Figure Description

[0015] Figure 1 This is a schematic block diagram of the vehicle provided in the embodiments of this application.

[0016] Figure 2 This is a schematic block diagram of the power supply circuit provided in the embodiments of this application.

[0017] Figure 3 This is a schematic block diagram of a power supply circuit provided in another embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the power supply circuit provided in the embodiment of this application.

[0019] Figure 5 This is a schematic block diagram of the charger provided in the embodiments of this application. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application. Unless otherwise specified, the different embodiments and features described below can be combined with each other.

[0021] It should be noted that when a device is referred to as "connecting" another device, it can be directly connected to the other device or indirectly connected (with an intermediary device).

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0023] This application provides a power supply circuit for a vehicle, a charger, and a relay. The power supply circuit can be switched after the relay is turned on, so that the power supply voltage of the relay is reduced. This can keep the relay in the conducting state and also reduce the power consumption and temperature of the relay.

[0024] Please see Figure 1 , Figure 1 This is a schematic block diagram of vehicle 10 according to an embodiment of this application. Figure 1 As shown, the vehicle 10 includes a charger 100, which includes a relay 110 and a power supply circuit 120. When the relay 110 is in the on state, the charger 100 outputs electrical energy through the relay 110 to charge the vehicle 10.

[0025] Please see Figure 2 This is a schematic block diagram of the power supply circuit 120 according to an embodiment of this application. Figure 2 As shown, the vehicle 10 also includes a first power supply 200 and a second power supply 300. The power supply circuit 120 includes a first power supply circuit 121, a second power supply circuit 122, and a control circuit 123.

[0026] The input terminal of the first power supply circuit 121 is connected to the first power supply 200, and the output terminal of the first power supply circuit 121 is connected to the control coil of the relay 110. The first power supply circuit 121 is used to output the first voltage provided by the first power supply 200 to the control coil of the relay 110, and the first voltage is used to drive the relay 110 to conduct.

[0027] The input terminal of the second power supply circuit 122 is connected to the second power supply 300, and the output terminal of the second power supply circuit 122 is connected to the control coil of the relay 110. The second power supply circuit 122 is used to output the second voltage provided by the second power supply 300 to the control coil of the relay 110, and the second voltage is used to keep the relay 110 in the on state.

[0028] Since the holding voltage of relay 110 is less than the driving voltage that drives relay 110 to engage, the second voltage is less than the first voltage.

[0029] It is understood that the output terminal of the first power supply circuit 121 is connected to the control coil of the relay 110 to provide a conduction voltage for the relay 110. The output terminal of the second power supply circuit 122 is connected to the control coil of the relay 110 to provide a voltage to maintain conduction for the relay 110. The first voltage provided by the first power supply 200 and the second voltage provided by the second power supply 300 can be determined according to the model of the relay 110.

[0030] The second voltage can be less than 80% of the first voltage, or it can be set to be less than 70% of the first voltage. Of course, the second voltage needs to provide a voltage to keep the relay 110 conducting, so it cannot be less than the release voltage of the relay 110, so as to prevent the relay 110 from disconnecting when switching to the second power supply circuit 122.

[0031] In a specific example, the relay 110 has a rated voltage of 12V and a coil resistance of 103Ω, with the corresponding first voltage set to 12V and the second voltage set to 9V.

[0032] In this embodiment, the first power source 200 and the second power source 300 can be power sources inside the vehicle 10 or power sources connected to the vehicle 10 from the outside.

[0033] The control circuit 123 is connected to the first power supply circuit 121 and the second power supply circuit 122. The control circuit 123 is used to send a first signal to the first power supply circuit 121 and a second signal to the second power supply circuit 122. The first power supply circuit 121 is used to output a first voltage according to the first signal, and the second power supply circuit 122 is used to output a second voltage according to the second signal.

[0034] It is understood that before the relay 110 is turned on, the control circuit 123 sends a first signal to the first power supply circuit 121, and then the first power supply circuit 121 outputs a first voltage to the control coil of the relay 110 according to the first signal, so that the relay 110 is energized and turned on.

[0035] When relay 110 is turned on, control circuit 123 stops sending the first signal to first power circuit 121 and sends a second signal to second power circuit 122. The second signal is used to control second power circuit 122 to output a second voltage.

[0036] In this embodiment, a first signal is sent to the first power supply circuit 121 via the control circuit 123. The first power supply circuit 121 outputs a first voltage provided by the first power supply 200 according to the first signal to drive the relay 110 to conduct. After the relay 110 is turned on, the control circuit 123 stops sending the first signal to the first power supply circuit 121 and sends a second signal to the second power supply circuit 122. The second power supply circuit 122 outputs a second voltage provided by the second power supply 300 according to the second signal. The supply voltage of the relay 110 switches from the first voltage to a second voltage lower than the first voltage, keeping the relay 110 in a conducting state. Therefore, the power supply circuit 120 can provide a smaller second voltage to the relay 110 after it is turned on, which not only keeps the relay 110 in a conducting state but also reduces the supply voltage of the relay 110, thereby reducing the coil power consumption of the relay 110, reducing the heat generated by the relay 110, lowering the temperature of the relay 110, and thus extending the service life of the relay 110. This also extends the service life of the charger 100 in the vehicle 10.

[0037] In this embodiment, the control circuit 123 may include a microcontroller unit (MCU), a control chip, etc. It is understood that when the control circuit 123 is an MCU or a control chip, the two ports of the MCU or control chip are respectively connected to the first power supply circuit 121 and the second power supply circuit 122 to output a first signal to the first power supply circuit 121 and a second signal to the second power supply circuit 122. The first signal and the second signal can be of the same type or different types. For example, both the first signal and the second signal can be high-level signals or low-level signals. Alternatively, the first signal can be high-level and the second signal can be low-level, or vice versa. This embodiment does not limit the specific types of the first signal and the second signal.

[0038] In some embodiments, the control circuit 123 can determine whether the relay 110 is conducting by detecting the voltage difference across the relay 110. Alternatively, the relay 110 can also send a conduction feedback signal to the control circuit 123 when it is conducting, in order to indicate to the control circuit 123 that the relay 110 is conducting.

[0039] Please see Figure 3In some embodiments, the first power supply circuit 121 includes a first switch Q1. A first end of the first switch Q1 is connected to a first power supply 200, and a second end of the first switch Q1 is connected to the control coil of a relay 110. The first switch Q1 is turned on according to a first signal, so that the first voltage provided by the first power supply 200 is provided to the control coil of the relay 110 through the turned-on first switch Q1, thereby driving the relay 110 to turn on.

[0040] Furthermore, the first power supply circuit 121 also includes a second switch Q2, with the first terminal of the first switch Q1 connected to the first power supply 200 via the second switch Q2. It can be understood that when the first power supply circuit 121 receives the first signal, that is, when the first power supply circuit 121 outputs the first voltage, the second switch Q2 also conducts, enabling the first voltage provided by the first power supply 200 to be output to the control coil of the relay 110 via the second switch Q2 and the first switch Q1, thereby driving the relay 110 to conduct. The second switch Q2 can remain in the conducting state at all times, or it can conduct after the first power supply circuit 121 receives the first signal.

[0041] In some embodiments, the first power supply circuit 121 further includes a third switch Q3. The control terminal of the third switch Q3 is connected to the control circuit 123, the first terminal of the third switch Q3 is connected to the control terminal of the first switch Q1, and the second terminal of the third switch Q3 is grounded or connected to the first power supply 200. The control circuit 123 is used to send a first signal to the control terminal of the third switch Q3, and the third switch Q3 is turned on according to the first signal, so that the first switch Q1 is turned on. In this embodiment, when the third switch Q3 is turned on, the control terminal of the first switch Q1 is grounded through the third switch Q3, thereby turning on the first switch Q1.

[0042] Of course, in some other embodiments, the third switch Q3 can also be turned off according to the first signal, so that the first switch Q1 is turned on. Whether the third switch Q3 turns off or on according to the first signal to turn on the first switch Q1 can be determined based on the specific models of the selected first switch Q1 and third switch Q3, as well as the specific circuit structure of the first power supply circuit 121.

[0043] It is understandable that the second terminal of the third switch Q3 can be connected to the first power supply 200 through a step-down circuit to prevent the first voltage provided by the first power supply 200 from being too high and damaging the third switch Q3.

[0044] Please refer to it again. Figure 3In some embodiments, the second power supply circuit 122 includes a fourth switch Q4. The first end of the fourth switch Q4 is connected to the second power supply 300, and the second end of the fourth switch Q4 is connected to the control coil. The fourth switch Q4 is turned on according to the second signal, so that the second voltage provided by the second power supply 300 is provided to the control coil of the relay 110 through the turned-on fourth switch Q4, thereby driving the relay 110 to turn on.

[0045] Furthermore, the second power supply circuit 122 also includes a fifth switch Q5. The control terminal of the fifth switch Q5 is connected to the control circuit 123, the first terminal of the fifth switch Q5 is connected to the control terminal of the fourth switch Q4, and the second terminal of the fifth switch Q5 is grounded or connected to the second power supply 300. The control circuit 123 is used to send a second signal to the control terminal of the fifth switch Q5, and the fifth switch Q5 is turned on according to the second signal, so that the fourth switch Q4 is turned on.

[0046] Of course, in some other embodiments, the fifth switch Q5 can also be turned off according to the second signal, so that the fourth switch Q4 can be turned on. Whether the fifth switch Q5 turns off or on according to the second signal to turn on the fourth switch Q4 can be determined based on the specific models of the selected fourth switch Q4 and fifth switch Q5, as well as the specific circuit structure of the second power supply circuit 122.

[0047] It is understandable that the second terminal of the fifth switch Q5 can be connected to the second power supply 300 through a step-down circuit to prevent the second voltage provided by the second power supply 300 from being too large and damaging the fifth switch Q5.

[0048] In this embodiment, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 can be PNP transistors, NPN transistors, PMOS transistors, NMOS transistors, etc. This embodiment does not limit the specific device types of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, and the fifth switch Q5, as long as they can perform their respective functions.

[0049] Please see Figure 4 , Figure 4 A circuit diagram of the power supply circuit 120 for the relay 110 according to an embodiment of this application is shown. Figure 4 As shown, the first power supply circuit 121 may also include a first diode D1 and a first bias resistor R1.

[0050] The second terminal of the first switch Q1 is connected to the control coil of the relay 110 via the first diode D1. Specifically, the anode of the first diode D1 is connected to the second terminal of the first switch Q1, and the cathode of the first diode D1 is connected to the control coil of the relay 110. Thus, when the relay 110 is turned on, and the control circuit 123 controls the relay 110 to switch from being powered by the first power supply circuit 121 to being powered by the second power supply circuit 122, the first diode D1 can prevent the second voltage provided by the second power supply circuit 122 from flowing into the first power supply circuit 121.

[0051] The first end of the first bias resistor R1 is connected to the first power supply 200, and the second end of the first bias resistor R1 is connected to the control terminal of the second switch Q2. The first bias resistor R1 is used to provide bias voltage for the second switch Q2.

[0052] Furthermore, the first power supply circuit 121 may also include a first current-limiting resistor R2, a second current-limiting resistor R3, a first pull-down resistor R4, a pull-up resistor R5, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a Zener diode DZ1.

[0053] In this circuit, the first end of the first current-limiting resistor R2 is connected to the control circuit 123, and the second end of the first current-limiting resistor R2 is connected to the control terminal of the third switch Q3. The control circuit 123 sends a first signal to the control terminal of the third switch Q3 through the first current-limiting resistor R2. The first current-limiting resistor R2 is used to prevent the current at the control terminal of the third switch Q3 from being too large.

[0054] The first end of the second current-limiting resistor R3 is connected to the first end of the third switch Q3, and the second end of the second current-limiting resistor R3 is connected to the control end of the first switch Q1. The second current-limiting resistor R3 is used to prevent the current at the control end of the first switch Q1 from being too large.

[0055] The first terminal of the first pull-down resistor R4 is connected to the control terminal of the third switch Q3, and the second terminal of the first pull-down resistor R4 is grounded. The first pull-down resistor R4 is used to pull the control terminal of the third switch Q3 low when no first signal is received, ensuring that the third switch Q3 is open and preventing the first switch Q1 from conducting when no first signal is received. In this case, the third switch Q3 is an NPN transistor, and the first switch Q1 is a PNP transistor. Alternatively, the first pull-down resistor R4 can pull the control terminal of the third switch Q3 low when no first signal is received, ensuring that the third switch Q3 is on and preventing the first switch Q1 from conducting when no first signal is received. In this case, the third switch Q3 is a PNP transistor, and the first switch Q1 is an NPN transistor.

[0056] exist Figure 4In the example, the first switch Q1 is a PNP transistor, and the second and third switches Q2 and Q3 are NPN transistors. At this time, the first signal is a high-level signal. The control terminals of the first, second, and third switches Q1 and Q3 are the bases. Specifically, the first terminal of the first switch Q1 is the emitter, and the second terminal is the collector. The first terminal of the second switch Q2 is the emitter, and the second terminal is the collector. The first terminal of the third switch Q3 is the collector, and the second terminal is the emitter.

[0057] The first end of the pull-up resistor R5 is connected to the base of the first switch Q1, and the second end of the pull-up resistor R5 is connected to the emitter of the second switch Q2. The first power supply 200 provides a high-level signal to the base of the second switch Q2 via the first bias resistor R1, turning on the second switch Q2. The first power supply 200 also provides a high-level signal to the base of the first switch Q1 via the turned-on second switch Q2 and the pull-up resistor R5, turning on the first switch Q1. When the first power supply circuit 121 receives a first signal, the first signal controls the third switch Q3 to turn on. The base of the first switch Q1 is grounded via the second current-limiting resistor R3 and the turned-on third switch Q3, turning on the first switch Q1. The first voltage provided by the first power supply 200 is then output to the control coil of the relay 110 through the turned-on second switch Q2 and the first switch Q1. In this embodiment, the second switch Q2 remains on at all times.

[0058] The first terminal of the first filter capacitor C1 is connected to the base of the third switch Q3, and the second terminal of the first filter capacitor C1 is grounded. The first filter capacitor C1 is used to filter the base of the third switch Q3. The first filter capacitor C1 and the first pull-down resistor R4 can together form an RC filter to filter the base of the third switch Q3.

[0059] The first terminal of the second filter capacitor C2 is connected to the second terminal of the pull-up resistor R5, and the second terminal of the second filter capacitor C2 is grounded to filter the base of the first switch Q1. The first terminal of the third filter capacitor C3 is connected to the base of the second switch Q2, and the second terminal of the third filter capacitor C3 is grounded to filter the base of the second switch Q2.

[0060] The anode of the Zener diode DZ1 is grounded, and the cathode of the Zener diode DZ1 is connected to the base of the second switch Q2. The Zener diode DZ1 is used to maintain the voltage of the base of the second switch Q2 so that the second switch Q2 remains in a stable conducting state.

[0061] Please refer to the following: Figure 3The first power supply circuit 121 may further include a third diode D3, the anode of which is connected to the emitter of the second switch Q2, and the cathode of which is connected to the base of the second switch Q2. The first switch Q1 ensures that the first voltage is supplied to the first switch Q1 via the collector and emitter of the second switch Q2.

[0062] Please refer to it again. Figure 3 The second power supply circuit 122 may also include a second diode D2 and a second bias resistor R6.

[0063] The second terminal of the fourth switch Q4 is connected to the control coil of the relay 110 via the second diode D2. Specifically, the anode of the second diode D2 is connected to the second terminal of the fourth switch Q4, and the cathode of the second diode D2 is connected to the control coil of the relay 110. Thus, when the control circuit 123 controls the first power supply circuit 121 to supply power to the control coil of the relay 110, the second diode D2 can prevent the first voltage provided by the first power supply circuit 121 from flowing into the second power supply circuit 122.

[0064] The first end of the second bias resistor R6 is connected to the first end of the fourth switch Q4, and the second end of the second bias resistor R6 is connected to the control terminal of the fourth switch Q4. The second bias resistor R6 is used to provide bias voltage for the fourth switch Q4.

[0065] Furthermore, the second power supply circuit 122 may also include a third current-limiting resistor R7, a fourth current-limiting resistor R8, a second pull-down resistor R9, a fourth filter capacitor C4, and a fifth filter capacitor C5.

[0066] The first end of the third current-limiting resistor R7 is connected to the control circuit 123, and the second end of the third current-limiting resistor R7 is connected to the control terminal of the fifth switch Q5. The control circuit 123 sends a second signal to the control terminal of the fifth switch Q5 through the third current-limiting resistor. The third current-limiting resistor R7 is used to prevent the current at the control terminal of the fifth switch Q5 from being too large.

[0067] The first end of the fourth current-limiting resistor R8 is connected to the first end of the fifth switch Q5, and the second end of the fourth current-limiting resistor R8 is connected to the control end of the fourth switch Q4. The fourth current-limiting resistor R8 is used to prevent the current at the control end of the fourth switch Q4 from being too large.

[0068] The first terminal of the second pull-down resistor R9 is connected to the control terminal of the fifth switch Q5, and the second terminal of the second pull-down resistor R9 is grounded. The second pull-down resistor R9 is used to pull the control terminal of the fifth switch Q5 low when the second signal is not received, ensuring that the fifth switch Q5 is open and preventing the fourth switch Q4 from conducting when the second signal is not received. In this case, the fifth switch Q5 is an NPN transistor, and the fourth switch Q4 is a PNP transistor. Alternatively, the second pull-down resistor R9 can pull the control terminal of the fifth switch Q5 low when the second signal is not received, ensuring that the fifth switch Q5 is on and preventing the fourth switch Q4 from conducting when the second signal is not received. In this case, the fifth switch Q5 is a PNP transistor, and the fourth switch Q4 is an NPN transistor.

[0069] exist Figure 3 In the example, the fourth switch Q4 is a PNP transistor, and the fifth switch Q5 is an NPN transistor. At this time, the second signal is a high-level signal. The control terminals of the fourth switch Q4 and the fifth switch Q5 are the base terminals.

[0070] The first terminal of the fourth filter capacitor C4 is connected to the base of the fifth switch Q5, and the second terminal of the fourth filter capacitor C4 is grounded. The fourth filter capacitor C4 is used to filter the base of the fifth switch Q5. The fourth filter capacitor C4 and the second pull-down resistor R9 together form an RC filter to filter the base of the fifth switch Q5.

[0071] The first terminal of the fifth filter capacitor C5 is connected to the emitter of the fourth switch Q4, and the second terminal of the fifth filter capacitor C5 is grounded. The fifth filter capacitor C5 is used to filter the second voltage received by the emitter of the fourth switch Q4.

[0072] The following is Figure 4 Taking the power supply circuit 120 as an example, the specific working process will be explained:

[0073] When the control circuit 123 outputs the first signal to the base of the third switch Q3, the third switch Q3 is turned on, pulling down the base of the first switch Q1 to a low level. The first switch Q1 is turned on, and the first voltage provided by the first power supply 200 is sequentially output to the control coil of the relay 110 through the turned-on second switch Q2, the first switch Q1, and the first diode D1, driving the relay 110 to turn on.

[0074] When control circuit 123 detects that relay 110 is turned on, control circuit 123 stops outputting the first signal to the base of third switch Q3 and outputs the second signal to the base of fifth switch Q5. Third switch Q3 is turned off, and the base of first switch Q1 is pulled up to a high level through pull-up resistor R5 and the turned-on second switch Q2. First switch Q1 is turned off, and first power supply 200 stops supplying power to the control coil of relay 110. The second signal controls fifth switch Q5 to turn on, pulling down the base of fourth switch Q4 to a low level. Fourth switch Q4 is turned on, and the second voltage provided by second power supply 300 is output to the control coil of relay 110 through the turned-on fourth switch Q4 and second diode D2, so that relay 110 remains in the on state.

[0075] Therefore, in this embodiment of the application, when the control circuit 123 detects that the relay 110 has been turned on, it stops outputting a first signal to the base of the third switch Q3 in the first power supply circuit 121, so that the first power supply 200 stops providing a first voltage to the relay 110. At the same time, the control circuit 123 outputs a second signal to the base of the fifth switch Q5, so that the second power supply 300 provides a second voltage less than the first voltage to the relay 110 through the second power supply 122. Thus, after the relay 110 is turned on, it maintains conduction with a lower voltage, so that the relay 110 can maintain the conducting state and reduce the supply voltage, thereby reducing the coil loss of the relay 110, reducing the heat generation of the relay 110 and reducing the stability of the relay 110, and improving the service life of the relay 110.

[0076] Please see Figure 5 This application also provides a charger 100, including a relay 110 and a power supply circuit 120. When the relay 110 is in the ON state, the charger 100 outputs electrical energy through the relay 110 to charge the device to be charged.

[0077] The power supply circuit 120 includes a first power supply circuit 121, a second power supply circuit 122, and a control circuit 123.

[0078] The input terminal of the first power supply circuit 121 is connected to the first power supply 200, and the output terminal of the first power supply circuit 121 is connected to the control coil of the relay 110. The first power supply circuit 121 is used to output a first voltage provided by the first power supply 200 to the control coil, and the first voltage is used to drive the relay 110 to conduct.

[0079] The input terminal of the second power supply circuit 122 is connected to the second power supply 300, and the output terminal of the second power supply circuit 122 is connected to the control coil of the relay 110. The second power supply circuit 122 is used to output the second voltage provided by the second power supply 300 to the control coil, and the second voltage is used to keep the relay 110 in the on state.

[0080] Since the holding voltage for the relay 110 to remain engaged is less than the driving voltage for the relay 110 to engage, the second voltage can be set to be less than the first voltage.

[0081] The control circuit 123 is connected to the first power supply circuit 121 and the second power supply circuit 122. The control circuit 123 is used to send a first signal to the first power supply circuit 121 and a second signal to the second power supply circuit 122. The first power supply circuit 121 is used to output a first voltage according to the first signal, and the second power supply circuit 122 is used to output a second voltage according to the second signal.

[0082] It is understood that the beneficial effects and specific implementation methods of the charger 100 provided in this application embodiment can be referred to the beneficial effects of the corresponding power supply circuit 120 provided above, and will not be repeated here. In addition, the circuit structure of the power supply circuit 120 in the vehicle 10 provided in this application embodiment is basically the same as the circuit structure of the corresponding power supply circuit 120 provided above, and will not be repeated here.

[0083] This application embodiment also provides a power supply circuit 120 for a relay 110, the power supply circuit 120 including a first power supply circuit 121, a second power supply circuit 122 and a control circuit 123.

[0084] The input terminal of the first power supply circuit 121 is connected to the first power supply 200, and the output terminal of the first power supply circuit 121 is connected to the control coil of the relay 110. The first power supply circuit 121 is used to output a first voltage provided by the first power supply 200 to the control coil, and the first voltage is used to drive the relay 110 to conduct.

[0085] The input terminal of the second power supply circuit 122 is connected to the second power supply 300, and the output terminal of the second power supply circuit 122 is connected to the control coil of the relay 110. The second power supply circuit 122 is used to output the second voltage provided by the second power supply 300 to the control coil, and the second voltage is used to keep the relay 110 in the on state.

[0086] Since the holding voltage for the relay 110 to remain engaged is less than the driving voltage for the relay 110 to engage, the second voltage can be set to be less than the first voltage.

[0087] The control circuit 123 is connected to the first power supply circuit 121 and the second power supply circuit 122. The control circuit 123 is used to send a first signal to the first power supply circuit 121 and a second signal to the second power supply circuit 122. The first power supply circuit 121 is used to output a first voltage according to the first signal, and the second power supply circuit 122 is used to output a second voltage according to the second signal.

[0088] It is understood that the beneficial effects and specific implementation methods of the power supply circuit 120 provided in this application embodiment can be referred to the corresponding beneficial effects of the vehicle 10 provided above, and will not be repeated here. In addition, the circuit structure of the power supply circuit 120 provided in this application embodiment is basically the same as the circuit structure of the power supply circuit 120 of the vehicle 10 provided above, and will not be repeated here.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A vehicle, comprising a charger, a first power source, and a second power source, wherein the charger includes a relay and a power supply circuit; When the relay is in the ON state, the charger outputs electrical energy through the relay to charge the vehicle; characterized in that... The power supply circuit includes: A first power supply circuit, wherein the input terminal of the first power supply circuit is connected to the first power source, and the output terminal of the first power supply circuit is connected to the control coil of the relay. A second power supply circuit, wherein the input terminal of the second power supply circuit is connected to the second power source, and the output terminal of the second power supply circuit is connected to the control coil of the relay; and A control circuit is connected to the first power supply circuit and the second power supply circuit. The control circuit is used to send a first signal to the first power supply circuit and a second signal to the second power supply circuit. The first power supply circuit is used to output a first voltage provided by the first power supply to the control coil according to the first signal, and the first voltage is used to drive the relay to conduct. The second power supply circuit is used to output a second voltage provided by the second power supply to the control coil according to the second signal, and the second voltage is used to keep the relay in the on state; wherein, the second voltage is less than the first voltage.

2. The vehicle as described in claim 1, characterized in that, The first power supply circuit includes a first switch, a first end of which is connected to the first power source, and a second end of which is connected to the control coil; the first switch is turned on according to the first signal.

3. The vehicle as described in claim 2, characterized in that, The first power supply circuit further includes a second switch, the first end of which is connected to the first power supply via the second switch; wherein the second switch is turned on when the first power supply circuit outputs the first voltage.

4. The vehicle as described in claim 2 or 3, characterized in that, The first power supply circuit further includes a third switch, the control terminal of the third switch is connected to the control circuit, the first terminal of the third switch is connected to the control terminal of the first switch, and the second terminal of the third switch is grounded or connected to the first power supply; the control circuit sends the first signal to the control terminal of the third switch, and the third switch is turned on or off according to the first signal to turn on the first switch.

5. The vehicle as described in claim 3, characterized in that, The first power supply circuit further includes a first diode and a first bias resistor; the second terminal of the first switch is connected to the control coil through the first diode; the first terminal of the first bias resistor is connected to the first power supply, and the second terminal of the first bias resistor is connected to the control terminal of the second switch.

6. The vehicle as described in claim 1, characterized in that, The second power supply circuit includes a fourth switch, the first end of which is connected to the second power supply, and the second end of which is connected to the control coil. The fourth switch is turned on according to the second signal.

7. The vehicle as described in claim 6, characterized in that, The second power supply circuit further includes a fifth switch, the control terminal of which is connected to the control circuit, the first terminal of which is connected to the control terminal of the fourth switch, and the second terminal of which is grounded or connected to the second power supply. The control circuit is used to send the second signal to the control terminal of the fifth switch, and the fifth switch is turned on or off according to the second signal to turn on the fourth switch.

8. The vehicle as described in claim 6 or 7, characterized in that, The second power supply circuit also includes a second diode and a second bias resistor; the second terminal of the fourth switch is connected to the control coil through the second diode; the first terminal of the second bias resistor is connected to the first terminal of the fourth switch, and the second terminal of the second bias resistor is connected to the control terminal of the fourth switch.

9. A charger, comprising a relay and a power supply circuit, wherein when the relay is in a conducting state, the charger outputs electrical energy through the relay to charge a device to be charged; Its features are, The power supply circuit includes: A first power supply circuit, wherein the input terminal of the first power supply circuit is used to connect to a first power source, and the output terminal of the first power supply circuit is connected to the control coil of the relay. A second power supply circuit, wherein the input terminal of the second power supply circuit is connected to the second power source, and the output terminal of the second power supply circuit is connected to the control coil of the relay; and A control circuit is connected to the first power supply circuit and the second power supply circuit. The control circuit is used to send a first signal to the first power supply circuit and a second signal to the second power supply circuit. The first power supply circuit is used to output a first voltage provided by the first power supply to the control coil according to the first signal, and the first voltage is used to drive the relay to conduct. The second power supply circuit is used to output a second voltage provided by the second power supply to the control coil according to the second signal, and the second voltage is used to keep the relay in the on state; wherein, the second voltage is less than the first voltage.

10. A power supply circuit for a relay, characterized in that, The power supply circuit includes: A first power supply circuit, wherein the input terminal of the first power supply circuit is used to connect to a first power source, and the output terminal of the first power supply circuit is connected to the control coil of the relay. A second power supply circuit, wherein the input terminal of the second power supply circuit is connected to the second power source, and the output terminal of the second power supply circuit is connected to the control coil of the relay; and A control circuit is connected to the first power supply circuit and the second power supply circuit. The control circuit is used to send a first signal to the first power supply circuit and a second signal to the second power supply circuit. The first power supply circuit is used to output a first voltage provided by the first power supply to the control coil according to the first signal, and the first voltage is used to drive the relay to conduct. The second power supply circuit is used to output a second voltage provided by the second power supply to the control coil according to the second signal, and the second voltage is used to keep the relay in the on state; wherein, the second voltage is less than the first voltage.

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