Power supply equipment, vehicle-mounted charger and new energy vehicle

Abstract

The utility model provides power supply equipment, a vehicle-mounted charger and a new energy vehicle. The power supply equipment is used for supplying power to a two-way backup load in in-vehicle load equipment of the new energy vehicle. The power supply device comprises a first power supply port, a second power supply port, a DC-DC circuit and a switch, the DC-DC circuit and the switch are integrated in the same machine shell, the first power supply port is used for being coupled with one path of the double-path backup load, and the second power supply port is used for being coupled with the other path of the double-path backup load. The input end of the DCDC circuit is used for being connected with a high-voltage battery of the new energy automobile to receive direct current. The output end of the DCDC circuit is used for being coupled with one end of the switch and the first power supply port, and the other end of the switch is used for being coupled with the second power supply port and a storage battery of the new energy automobile. By controlling the state of the switch, the reliability of backup power supply under any single fault of the fault of the DCDC circuit and the failure of the storage battery can be guaranteed, and the safety of the whole vehicle is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicle charging and discharging technology, and in particular to a power supply device, an on-board charger and a new energy vehicle. Background Art

[0002] With the development of new energy vehicles and the requirements of the carbon neutrality strategic goal, traditional fuel-powered vehicles are being gradually replaced by new energy vehicles, such as battery electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV) and hybrid electric vehicles (HEV). The power supply part of new energy vehicles is generally composed of high-voltage power batteries and low-voltage batteries; among them, low-voltage batteries are mainly used to power automatic driving equipment, car entertainment equipment and other terminal equipment. With the development of new energy vehicles, the number of the above-mentioned equipment continues to increase, resulting in a gradual increase in the demand for low-voltage loads inside the car, which increases the failure rate. Due to the needs of automatic driving and driving safety, the requirements for low-voltage power supply reliability have increased. At present, the low-voltage power supply system in the vehicle is a DC-to-DC DCDC circuit, and the battery is directly connected to the load. Any short circuit or failure of any device will cause the load current to increase, causing the low-voltage power supply system to lose power or protect, making the dual-circuit backup power supply unable to truly play a backup role. Summary of the invention

[0003] The present application provides a power supply device, an on-board charger and a new energy vehicle, which can ensure the reliability of backup power supply when any one of the load and the battery fails.

[0004] In the first aspect, the present application provides a vehicle power supply device, which can be applied to various vehicles, for example, it can be applied to new energy vehicles, and the vehicle may include: in-vehicle load equipment and a battery. The power supply device may include: a direct current to direct current (DCDC) circuit and a switch; wherein the output end of the DCDC circuit is coupled to one end of the switch and serves as the first power supply port of the power supply device, and the other end of the switch serves as the second power supply port of the power supply device; the first power supply port is used to couple with the first load in the in-vehicle load device, and the second power supply port is used to couple with the second load in the in-vehicle load device and the battery respectively. The first load may include one of the important dual-path backup loads in the in-vehicle load device, and the second load may include the other of the important dual-path backup loads in the in-vehicle load device, that is, the important loads are all dual-path controlled, one of which is used as a backup, and the two backup loads are powered from both ends of the switch respectively. The initial state of the switch is turned on, so that under normal working conditions, the DCDC circuit supplies power to the battery through the switch, and the important dual-path backup loads in the in-vehicle load device can be powered from the front and back of the switch respectively, that is, the two paths of the important dual-path backup load can be powered normally at the same time through the DCDC circuit and the battery. When a fault is detected in the first load coupled to the first power supply port, the switch can be disconnected, and the second load coupled to the second power supply port can be powered by the battery, ensuring that one of the important dual-path backup loads is normally powered by the battery; when a fault is detected in the second load and / or the battery coupled to the second power supply port, the switch can also be disconnected, and the first load coupled to the first power supply port can be powered by the DCDC circuit, ensuring that one of the important dual-path backup loads is normally powered by the DCDC circuit. Further, when a fault is detected in the DCDC circuit, the switch can be disconnected, and the second load coupled to the second power supply port can be powered by the battery, ensuring that one of the important dual-path backup loads is normally powered by the battery; or, when a fault is detected in the DCDC circuit and the protection function is disconnected, the switch can be kept on, and the first load coupled to the first power supply port and the second load coupled to the second power supply port can be powered by the battery at the same time, ensuring that both of the important dual-path backup loads are normally powered by the battery. By controlling the state of the switch, it can be ensured that important loads are powered in the event of any single fault such as short circuit in the vehicle load equipment, failure in the DCDC circuit, and battery failure. The reliability of the backup power supply for important low-voltage loads of the entire vehicle can still be guaranteed, thereby improving the reliability of the redundant power supply for the low-voltage loads and ensuring the safety of the entire vehicle.

[0005] As a possible implementation method, based on integrated modular thinking, when designing power supply equipment, the DCDC circuit and the switch can be integrated in the same housing, which is conducive to reducing the number of parts, improving assembly efficiency, reducing material costs, and shortening the development cycle.

[0006] As a possible implementation, the DCDC circuit and the switch can also be integrated on the same circuit board, which is beneficial to reduce the number of parts, improve assembly efficiency, reduce material costs, and shorten the development cycle. Alternatively, the DCDC circuit and the switch can also be set on different circuit boards for easy maintenance and inspection.

[0007] As a possible implementation, the switch may be an electronic switch, such as a bidirectional (also referred to as a top-to-bottom) switch tube, and the switch tube may be a metal oxide semiconductor field effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a bipolar junction transistor (BJT), etc. Alternatively, the switch may be a mechanical switch, such as a relay, a contactor, etc. The switch may be one or more, which is not limited here.

[0008] In a second aspect, the present application provides a vehicle, including: an in-vehicle load device, a battery, and a power supply device according to any one of the first aspects. The technical effects of the corresponding scheme in the second aspect can refer to the technical effects that can be obtained by the corresponding scheme in the first aspect, and the repeated parts will not be described in detail.

[0009] As a possible implementation method, when applied to new energy vehicles, the vehicle will also include an on-board charger (OBC).

[0010] As a possible implementation, the OBC may also include a DCDC circuit. The OBC and the power supply device may share a DCDC circuit, or may respectively set different DCDC circuits, which is not limited here.

[0011] As a possible implementation, the in-vehicle load device may include but is not limited to a car radio, a car navigation system, an auxiliary driving device, and an automatic parking device, etc. inside the car. All devices that can be powered by a low-voltage (12 / 24 / 36 / 48V) battery can be regarded as in-vehicle load devices. The important loads in the in-vehicle load device can be, for example, brake devices and other devices that play a key role in normal driving, or it can be considered that the loads with backup are all important loads, and the two important dual-path backup loads are respectively coupled to the first power supply port and the second power supply port to ensure that under a single fault, one of the dual-path backup loads can be powered normally, thereby improving the reliability of the backup power supply. The secondary loads in the in-vehicle load device can be, for example, a car radio and other devices that have little effect on normal driving, or it can be considered that the load without backup is a secondary load, and the secondary load can be powered from any port of the first power supply port and the second power supply port, that is, the first load can also include the secondary loads in the in-vehicle load device, and the second load can also include the secondary loads in the in-vehicle load device. The number of the first load and the second load connected to the first power supply port and the second power supply port can be the same or different.

[0012] As a possible implementation, the battery 400 includes at least one of the following types of batteries: lead-acid battery, lithium-ion battery, nickel-metal hydride battery, lithium polymer battery, nickel-cadmium battery and supercapacitor, etc., and it should be noted that any device or device that can be used to store and / or release electrical energy can be used as the battery of the present application.

[0013] In the third aspect, the present application also provides a method for powering a vehicle according to any one of the items in the second aspect, including setting the initial state of the switch to be on, so that under normal working conditions, the DCDC circuit supplies power to the battery through the switch, and the important dual-path backup loads in the in-vehicle load equipment can be powered from the front and back of the switch respectively, that is, the DCDC circuit and the battery can supply power to both important dual-path backup loads at the same time. When a fault is detected in the first load coupled to the first power supply port, the switch can be disconnected, and the second load coupled to the second power supply port can be powered by the battery, ensuring that one of the important dual-path backup loads is normally powered by the battery; when a fault is detected in the second load and / or the battery coupled to the second power supply port, the switch can also be disconnected, and the first load coupled to the first power supply port can be powered by the DCDC circuit, ensuring that one of the important dual-path backup loads is normally powered by the DCDC circuit. Furthermore, when a fault in the DCDC circuit is detected, the switch can be disconnected, and the second load coupled to the second power supply port can be powered by the battery, ensuring that one of the important dual-path backup loads is normally powered by the battery; or, when a fault in the DCDC circuit is detected and the protection function is disconnected, the switch can be kept on, and the first load coupled to the first power supply port and the second load coupled to the second power supply port can be powered by the battery at the same time, ensuring that both paths of the important dual-path backup load are normally powered by the battery. By controlling the state of the switch, it can be ensured that the important loads are powered in the event of any single fault such as a short circuit in the load equipment in the vehicle, a fault in the DCDC circuit, or a battery failure, and the reliability of the backup power supply for the important low-voltage loads of the entire vehicle can still be guaranteed, thereby improving the reliability of the redundant power supply of the low-voltage loads and ensuring the safety of the entire vehicle.

[0014] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system structure of a new energy vehicle;

[0016] Figure 2 It is a structural schematic diagram of an existing power supply device;

[0017] Figure 3 It is a structural schematic diagram of another existing power supply equipment;

[0018] Figure 4 A schematic diagram of the structure of the power supply device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that in the description of the present application, "at least one" refers to one or more, wherein multiple refers to two or more. In view of this, "multiple" can also be understood as "at least two" in the embodiment of the present invention. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previous and next associated objects are in an "or" relationship. In addition, it should be understood that in the description of the present application, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0020] It should be pointed out that in the embodiments of the present application, "coupling" refers to an energy transfer relationship. For example, the coupling of A and B refers to the ability to transfer energy between A and B, wherein there are many possible specific forms of energy, such as electric energy, magnetic field potential energy, etc. When electric energy can be transferred between A and B, it is reflected in the circuit connection relationship that A and B can be directly electrically connected, or indirectly electrically connected through other conductors or circuit elements. When magnetic field potential energy can be transferred between A and B, it is reflected in the circuit connection relationship that electromagnetic induction can occur between A and B, so that magnetic field potential energy can be transferred from A to B. In view of this, in the embodiments of the present application, "magnetic coupling" specifically refers to the scenario in which energy can be transferred between A and B through the magnetic field.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0022] With the development of new energy vehicles, traditional fuel-powered vehicles are being gradually replaced by new energy vehicles. Figure 1 The schematic diagram of the system structure of a new energy vehicle is shown as an example. Figure 1 As shown, the new energy vehicle mainly includes a charging circuit 101, a low-voltage load device 102, a low-voltage battery 103, a high-voltage power battery 104, a motor 105, a wheel 106, and a DCDC circuit 107. Among them, the low-voltage load device 102 can be a functional circuit or a vehicle-mounted device inside the new energy vehicle. The high-voltage power battery 104 can be a large-capacity, high-power battery.

[0023] When the new energy vehicle is running, the high voltage power battery 104 can drive the motor 105 to work, and the motor 105 can then drive the wheels 106 to rotate, thereby achieving the movement of the new energy vehicle. In addition, the high voltage power battery 104 can also supply power to the low voltage battery 103 through the DCDC circuit 107, or can also supply power to an external load of the new energy vehicle (such as another new energy vehicle) through the charging circuit 101.

[0024] New energy vehicles can generally be charged through charging piles. Similar to the relationship between gas stations and conventional cars, charging piles can "refuel" new energy vehicles, that is, they can charge new energy vehicles. Figure 1 As shown, the charging pile mainly includes a power circuit and a charging gun. One end of the power circuit is coupled to the power frequency power grid, and the other end is coupled to the charging gun through a cable. In general, the power circuit in the charging pile can regard the power frequency power grid as an AC input source, receive the AC power provided by the power frequency power grid, and convert the received AC power into charging power compatible with the new energy vehicle. The operator can insert the charging gun into the charging socket of the new energy vehicle so that the charging gun is coupled with the charging circuit 101 in the new energy vehicle, and the power circuit of the charging pile can then provide the charging power to the charging circuit 101 through the charging gun. The charging circuit 101 provides a portion of the received charging power to the high-voltage power battery 104, and the high-voltage power battery 104 then stores the portion of the power. In general, the charging circuit 101 in the new energy vehicle has at least two working modes: charging mode and discharging mode. Specifically, in the charging mode, the charging circuit 101 receives the charging power provided by the charging pile, and provides the received charging power to the high-voltage power battery 104. In the discharge mode, the charging circuit 101 receives the battery power provided by the high-voltage power battery 104 , and the charging circuit 101 may also provide the battery power provided by the high-voltage power battery 104 to a load external to the vehicle.

[0025] As the number of low-voltage load devices 102 inside new energy vehicles is increasing, the demand for low-voltage loads inside new energy vehicles is also gradually increasing, which increases the failure rate. Due to the needs of automatic driving and driving safety, the requirements for low-voltage power supply reliability are increasing. At present, the low-voltage power supply system in the vehicle is a DC-to-DC DCDC circuit, and the battery is directly connected to the load. Any short circuit or failure of any device will cause the load current to increase, causing the low-voltage power supply system to lose power or protection, making the dual-circuit backup power supply unable to truly play a backup role.

[0026] Figure 2 The schematic diagram of the structure of an existing power supply device is shown as an example. Figure 2As shown, the low-voltage power supply systems in current vehicles are all DC-to-DC (DCDC) circuits, batteries and loads that are directly connected, that is, the DCDC circuit and the battery supply power to the vehicle load. Specifically, before the vehicle starts, the battery supplies power to the load and can wake up the DCDC circuit at the same time. After the vehicle starts, the DCDC circuit replenishes power to the battery and supplies power to the vehicle load at the same time. The disadvantages are: when the DCDC circuit fails, the battery discharge time is short, and when the load or battery has a short circuit fault, the entire voltage network is abnormally pulled to a low voltage, which will cause the vehicle to lose control.

[0027] Figure 3 The structural diagram of another existing power supply device is shown as an example. Figure 3 As shown, the low-voltage lithium battery module and the DCDC charging module are directly connected to the low-voltage load of the vehicle at the same time, wherein the low-voltage lithium battery module can be equipped with a bidirectional electronic fuse (efuse) to cut off the low-voltage lithium battery pack from the circuit alone, and fuses can also be arranged separately in the load and the DCDC charging module. Its disadvantages are: when the DCDC charging module fails, or the load and the battery have a short circuit fault, it will still cause the low-voltage lithium battery module itself to be disconnected from the low-voltage (LV) power line, and the DCDC charging module will start the protection mechanism, causing the low-voltage system of the vehicle to be powered off. In addition, the DCDC charging module and the low-voltage lithium battery module are two independent electronic control units (ECUs), and the two can only communicate and report through the controller area network (CAN) bus, with slow response speed and unable to be linked and controlled.

[0028] Figure 4 The schematic diagram of the structure of a power supply device provided by an embodiment of the present application is exemplarily shown. Figure 4As shown, the power supply device 200 provided in the present application can be applied to various vehicles, for example, it can be applied to new energy vehicles, and the vehicle can also include: an in-vehicle load device 300, a battery 400 and a high-voltage battery 500. The power supply device 200 provided in the present application may include: a direct current to direct current (DCDC) circuit 201 and a switch 202; wherein the input end of the DCDC circuit 201 is connected to the high-voltage battery 500, the output end of the DCDC circuit 201 is coupled to one end of the switch 202 and serves as the first power supply port A of the power supply device 200, and the other end of the switch 202 serves as the second power supply port B of the power supply device 200; the first power supply port A is used to couple with the first load in the in-vehicle load device 300, and the second power supply port B is used to couple with the second load in the in-vehicle load device 300 and the battery 400, respectively. The first load may include one of the important dual-channel backup loads in the in-vehicle load device 300, and the second load may include the other of the important dual-channel backup loads in the in-vehicle load device, that is, the important loads are all dual-channel controlled, one of which is used as a backup, and the two backup loads are powered from both ends of the switch 202. The initial state of the switch 202 is on, so that under normal working conditions, the DCDC circuit 201 supplies power to the battery 400 through the switch 202, and the important dual-channel backup loads in the in-vehicle load device 300 can be powered from the front and back of the switch 202 respectively, that is, the DCDC circuit 201 and the battery 400 can be used to supply power to the two channels of the important dual-channel backup loads at the same time. When one or more of the following faults are detected, the state of the control switch 202 is changed to disconnected; the faults include: the first load coupled to the first power supply port A fails, or the second load coupled to the second power supply port B fails, or the battery 400 fails. Specifically, when a fault is detected in the first load coupled to the first power supply port A, the switch 202 can be disconnected, and the second load coupled to the second power supply port B can be powered by the battery 400, thereby ensuring that one of the important dual-path backup loads is normally powered by the battery 400; when a fault is detected in the second load coupled to the second power supply port B and / or the battery 400, the switch 202 can also be disconnected, and the first load coupled to the first power supply port A can be powered by the DCDC circuit 201, thereby ensuring that one of the important dual-path backup loads is normally powered by the DCDC circuit 201. Further, when a fault is detected in the DCDC circuit 201, the switch 202 can be disconnected, and the second load coupled to the second power supply port B can be powered by the battery 400, thereby ensuring that one of the important dual-path backup loads is normally powered by the battery 400; or, when a fault is detected in the DCDC circuit 201 and the protection function is disconnected, the switch 202 can be kept on, and the first load coupled to the first power supply port A and the second load coupled to the second power supply port B can be powered by the battery 400 at the same time, thereby ensuring that both paths of the important dual-path backup load are normally powered by the battery 400.By controlling the state of the switch 202, it can be ensured that important loads are powered when any single fault occurs, such as a short circuit in the vehicle load device 300, a fault in the DCDC circuit 201, or a failure in the battery 400. The important low-voltage loads of the entire vehicle can still ensure the reliability of the backup power supply, thereby improving the reliability of the redundant power supply of the low-voltage loads and ensuring the safety of the entire vehicle.

[0029] Exemplarily, the in-vehicle load device 300 may include, but is not limited to, a car radio, a car navigation system, an auxiliary driving device, and an automatic parking device, etc., and any device that can be powered by a low-voltage (12 / 24 / 36 / 48V) battery can be regarded as an in-vehicle load device 300, and the present application embodiment will not enumerate them one by one. The important loads in the in-vehicle load device 300 may be, for example, braking devices and other devices that play a key role in normal driving, or the loads with backups may be considered important loads, and two of the important dual-path backup loads are respectively coupled to the first power supply port A and the second power supply port B to ensure that under a single fault, one of the dual-path backup loads can be powered normally, thereby improving the reliability of the backup power supply. The secondary load in the in-vehicle load device 300 may be, for example, a device that has little effect on normal driving, such as a car radio, or a load without backup may be considered a secondary load. The secondary load may draw power from any of the first power supply port A and the second power supply port B, that is, the first load may also include the secondary load in the in-vehicle load device 300, and the second load may also include the secondary load in the in-vehicle load device 300. The number of first loads and second loads connected to the first power supply port A and the second power supply port B may be the same or different, and is not limited here.

[0030] The battery 400 is used to power the in-vehicle load device 300, wherein the battery 400 may include at least one of the following types of batteries: lead-acid battery, lithium-ion battery, nickel-metal hydride battery, lithium polymer battery, nickel-cadmium battery and supercapacitor, etc., and it should be noted that any device or device that can be used to store and / or release electrical energy can be used as the battery 400 of the present application.

[0031] The DCDC circuit 201 can convert the input direct current into the charging voltage of the battery 400. In specific implementation, the DCDC circuit 201 can be composed of devices such as a switch tube, a diode, an inductor, and a capacitor. The working state of the DCDC circuit 201 is adjusted by adjusting the working state of the above-mentioned devices (such as the switch tube). When applied to new energy vehicles, direct current can be input to the DCDC circuit 201 through a high-voltage battery 500. The high-voltage battery can be a high-voltage, large-capacity, and high-power battery used to drive the motor in the new energy vehicle to work, and the motor then drives the wheels to rotate, so that the new energy vehicle can be driven.

[0032] The switch 202 can connect the voltage signal flowing bidirectionally between the DCDC circuit 201 and the battery 400 when it is turned on, and can block the voltage signal flowing bidirectionally between the DCDC circuit 201 and the battery 400 when it is turned on. The switch 202 can be specifically an electronic switch, such as a bidirectional (also called a top-to-top) switch tube, and the switch tube can specifically be a metal oxide semiconductor field effect transistor (metal oxide semiconductor field effect transistor, MOSFET), an insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT), a bipolar junction transistor (bipolar junction transistor, BJT), etc. Or the switch 202 can also be a mechanical switch, such as a relay, a contactor, etc. The switch 202 can be one or more, which is not limited here. Each switch can include a first electrode, a second electrode and a control electrode, wherein the control electrode is used to control the conduction or disconnection of the switch. When the switch is turned on, current can be transmitted between the first electrode and the second electrode of the switch, and when the switch is turned off, current cannot be transmitted between the first electrode and the second electrode of the switch. Taking MOSFET as an example, the control electrode of the switch is the gate, the first electrode of the switch can be the source of the switch, the second electrode can be the drain of the switch, or the first electrode can be the drain of the switch, and the second electrode can be the source of the switch.

[0033] Integrated modularization runs through the entire process of vehicle development, process design, etc., which is conducive to reducing the number of parts, improving assembly efficiency, reducing material costs, and shortening the development cycle. It is the main trend of vehicle development and design. Based on the integrated modular thinking, when designing the power supply device 200, the DCDC circuit 201 and the switch 202 can be integrated in the same housing. Specifically, the DCDC circuit 201 and the switch 202 can also be integrated on the same circuit board, or the DCDC circuit 201 and the switch 202 can also be set on different circuit boards respectively, which is not limited here.

[0034] Furthermore, in order to reduce the demand for the volume of the entire vehicle, the DCDC circuit 201 can also be integrated with other components inside the vehicle. For example, when applied to new energy vehicles, the vehicle will also include an on-board charger (OBC). The OBC will also include a DCDC circuit. The OBC and the power supply device 200 can share a DCDC circuit 201, or they can be provided with different DCDC circuits, which is not limited here.

[0035] Based on the same inventive concept, the present application also provides a vehicle, comprising: an in-vehicle load device 300, a battery 400, and a power supply device 200 as described in any of the above embodiments. Through the state of the control switch 202 in the power supply device 200, it can be ensured that in the event of any single failure of a short circuit in the in-vehicle load device 300, a failure in the DCDC circuit 201, and a failure in the battery 400, the important loads in the vehicle are powered, and the important low-voltage loads of the vehicle can still ensure the reliability of the backup power supply, thereby improving the reliability of the redundant power supply of the low-voltage loads and ensuring the safety of the vehicle.

[0036] The in-vehicle load device 300 may include, but is not limited to, a car radio, a car navigation system, an auxiliary driving device, and an automatic parking device inside the car, etc. All devices that can be powered by a low-voltage (12 / 24 / 36 / 48V) battery can be regarded as the in-vehicle load device 300, and the embodiments of the present application will not be listed one by one. The important loads in the in-vehicle load device 300 can be, for example, braking devices and other devices that play a key role in normal driving, or it can be considered that the loads with backup are all important loads, and the two paths of the important dual-path backup load are respectively coupled to the first power supply port A and the second power supply port B to ensure that under a single fault, one of the dual-path backup loads can be powered normally, thereby improving the reliability of the backup power supply. The secondary loads in the in-vehicle load device 300 can be, for example, a car radio and other devices that have little effect on normal driving, or it can be considered that the loads without backup are secondary loads, and the secondary loads can be powered from any of the first power supply port A and the second power supply port B, that is, the first load can also include the secondary loads in the in-vehicle load device 300, and the second load can also include the secondary loads in the in-vehicle load device 300. The number of the first load and the second load connected to the first power supply port A and the second power supply port B may be the same or different, which is not limited here.

[0037] The battery 400 is used to power the in-vehicle load device 300, wherein the battery 400 may include at least one of the following types of batteries: lead-acid battery, lithium-ion battery, nickel-metal hydride battery, lithium polymer battery, nickel-cadmium battery and supercapacitor, etc., and it should be noted that any device or device that can be used to store and / or release electrical energy can be used as the battery 400 of the present application.

[0038] When applied to new energy vehicles, the input end of the DCDC circuit 201 can be coupled to the high-voltage battery 500, which is used to provide driving power for the new energy vehicle. The vehicle will also include an OBC. The OBC will also include a DCDC circuit. The OBC and the power supply device 200 can share a DCDC circuit 201, or they can set different DCDC circuits separately, which is not limited here.

[0039] Based on the same inventive concept, the present application also provides a method for powering any vehicle described in the above embodiments, including: setting the initial state of the switch 202 to on, so that under normal working conditions, the DCDC circuit 201 supplies power to the battery 400 through the switch 202, and the important dual-channel backup loads in the in-vehicle load device 300 can be powered from the front and back of the switch 202 respectively, that is, the two channels of the important dual-channel backup loads can be powered normally at the same time through the DCDC circuit 201 and the battery 400. When one or more of the following faults are detected, the state of the control switch 202 is changed to off; the faults include: a fault in the first load coupled to the first power supply port A, or a fault in the second load coupled to the second power supply port B, or a fault in the battery 400. Specifically, when a fault is detected in the first load coupled to the first power supply port A, the switch 202 can be disconnected, and the second load coupled to the second power supply port B can be powered by the battery 400, thereby ensuring that one of the important dual-path backup loads is normally powered by the battery 400; when a fault is detected in the second load coupled to the second power supply port B and / or the battery 400, the switch 202 can also be disconnected, and the first load coupled to the first power supply port A can be powered by the DCDC circuit 201, thereby ensuring that one of the important dual-path backup loads is normally powered by the DCDC circuit 201. Further, when it is detected that the DCDC circuit 201 fails, the switch 202 can be disconnected, and the second load coupled to the second power supply port B can be powered by the battery 400, ensuring that one of the important dual-path backup loads is normally powered by the battery 400; or, when it is detected that the DCDC circuit 201 fails and has a protective function disconnected, the switch 202 can be kept in the on state, and the first load coupled to the first power supply port A and the second load coupled to the second power supply port B can be powered by the battery 400 at the same time, ensuring that the two paths of the important dual-path backup load are normally powered by the battery 400. By controlling the state of the switch 202, it can be ensured that the important loads are powered in the event of any single failure among a short circuit of the in-vehicle load device 300, a failure of the DCDC circuit 201, and a failure of the battery 400, and the important low-voltage loads of the entire vehicle can still ensure the reliability of the backup power supply, thereby improving the reliability of the redundant power supply of the low-voltage loads and ensuring the safety of the entire vehicle.

[0040] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), or a semiconductor medium (e.g., a solid state drive (solid statedisk, SSD)), etc.

[0041] The present application also provides a readable storage medium for storing the method or algorithm provided in the above embodiment, for example, a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM memory, an electronic programmable ROM (EPROM), a register, a hard disk, a removable disk or any other form of storage medium in the art.

[0042] The steps of the method or algorithm described in the embodiments of the present application can be directly embedded in the OBC. The OBC may include a RAM memory, a flash memory, a ROM memory, an EPROM memory, a register, a hard disk, a removable disk, or any other form of storage medium in the art, for storing the steps of the method or algorithm provided in the embodiments of the present application. Exemplarily, the storage medium can be connected to a control module or a processor (or controller) in the OBC so that the control module, the processor (or controller) can read information from the storage medium and can write information to the storage medium. Optionally, the storage medium can also be integrated into the control module, the processor (or controller).

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0044] Although the present application has been described in conjunction with specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A power supply device for a vehicle, the vehicle comprising an in-vehicle load device, a battery and a high-voltage battery, the battery being used to power the in-vehicle load device, the high-voltage battery being used to drive a motor in the vehicle to work and drive the wheels to rotate, characterized in that: The power supply device includes a DC to DC (DCDC) circuit and a switch, wherein: The input end of the DCDC circuit is used to couple the high-voltage battery, the output end of the DCDC circuit is coupled to one end of the switch and serves as the first power supply port of the power supply device, the other end of the switch serves as the second power supply port of the power supply device, the first power supply port is used to couple with the first load in the in-vehicle load device, the second power supply port is used to couple with the second load in the in-vehicle load device and the battery respectively, the first load includes one of the important dual-path backup loads in the in-vehicle load device, and the second load includes the other of the important dual-path backup loads in the in-vehicle load device; The power supply device is used to supply power to the important dual-path backup load in the in-vehicle load device, the initial state of the switch is on, and the DCDC circuit and the battery supply power to the two paths of the important dual-path backup load normally at the same time; when the second load coupled to the second power supply port fails, the DCDC circuit supplies power to the first load coupled to the first power supply port; when the first load coupled to the first power supply port fails, the battery supplies power to the second load coupled to the second power supply port.

2. The power supply device according to claim 1, characterized in that: When the DCDC circuit fails, the state of the switch becomes disconnected, and the battery supplies power to the second load coupled to the second power supply port; Alternatively, when the DCDC circuit fails and has a protection function disconnected, the switch remains on, and the battery supplies power to a first load coupled to the first power port and a second load coupled to the second power port at the same time.

3. The power supply device according to claim 1, characterized in that: The DCDC circuit and the switch are installed in the same casing.

4. The power supply device according to claim 3, characterized in that: The DCDC circuit and the switch are integrated on the same circuit board, or the DCDC circuit and the switch are respectively arranged on different circuit boards.

5. The power supply device according to any one of claims 1 to 4, characterized in that: The switch is an electronic switch, comprising a first electrode, a second electrode and a control electrode, wherein the control electrode is used to control the on or off of the switch, wherein: When the switch is turned on, current is transmitted between the first electrode and the second electrode of the switch; When the switch is turned off, no current can be transmitted between the first electrode and the second electrode of the switch.

6. The power supply device according to claim 5, characterized in that: The electronic switch is a bidirectional metal oxide semiconductor field effect transistor, a bidirectional insulated gate bipolar transistor, or a bidirectional bipolar junction transistor.

7. The power supply device according to any one of claims 1 to 4, characterized in that: The switch is a mechanical switch.

8. The power supply device according to claim 7, characterized in that: The mechanical switch is a relay or a contactor.

9. A new energy vehicle, characterized in that: The vehicle includes an in-vehicle load device, a storage battery, a high-voltage battery, and a power supply device. The in-vehicle load device includes a first load and a second load. The first load includes one of the important dual-path backup loads in the in-vehicle load device, and the second load includes the other of the important dual-path backup loads in the in-vehicle load device. The storage battery is used to supply power to the in-vehicle load device, the high-voltage battery is used to drive the motor in the vehicle to work and then drive the wheels to rotate, and the power supply device is used to supply power to the important dual-path backup load in the in-vehicle load device. The power supply device includes a DC to DC DCDC circuit and a switch, wherein: The input end of the DCDC circuit is used to couple the high-voltage battery, the output end of the DCDC circuit is coupled to one end of the switch and serves as the first power supply port of the power supply device, and the other end of the switch serves as the second power supply port of the power supply device; The first power supply port is used to couple with the first load in the in-vehicle load device, and the second power supply port is used to couple with the second load in the in-vehicle load device and the battery respectively; The initial state of the switch is on, and the DCDC circuit and the battery supply power to the two paths of the important dual-path backup load normally at the same time; The state of the switch becomes disconnected when one of the following faults occurs, wherein the following faults include a fault in a first load coupled to the first power supply port, a fault in a second load coupled to the second power supply port, or a fault in the battery, and the DCDC circuit supplies power to the first load coupled to the first power supply port or the battery supplies power to the second load coupled to the second power supply port.

10. A vehicle charger, characterized in that: The on-board charger shares the same DCDC circuit with the power supply device according to any one of claims 1 to 8.

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