Power conversion apparatus, method of controlling power supply, power

Abstract

The invention provides a power conversion device, a method for controlling power supply, an electric power system and a vehicle, and relates to the technical field of new energy automobiles, the method comprises a first power conversion circuit, the first power conversion circuit comprises an OBC and a third sub-conversion circuit, the OBC comprises a first sub-conversion circuit and a second sub-conversion circuit, the second sub-conversion circuit is electrically connected with a power battery, and the third sub-conversion circuit is electrically connected with the power battery; the third sub-conversion circuit is electrically connected with the load circuit, and the first sub-conversion circuit, the second sub-conversion circuit and the third sub-conversion circuit are in coupling connection; and the first end of the second power conversion circuit is electrically connected with the load circuit, and the second end of the second power conversion circuit is electrically connected with the power battery. Based on the method, on one hand, the power conversion efficiency of the DCDC converter can be improved, and on the other hand, when one DCDC converter fails, the power utilization requirement of a user for long-time driving can still be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, and more particularly, to a power conversion device, a power supply control method, a power system, and a new energy vehicle. BACKGROUND

[0002] A direct current-direct current (DCDC) converter is a key component in a new energy vehicle. When the vehicle is running, the DCDC converter converts high-voltage direct current of a power battery into low-voltage direct current to provide power for low-voltage electrical equipment. However, when the DCDC converter fails, a storage battery will be used for temporary power supply, but the storage battery has a small amount of power and cannot meet the power demand for long-time driving. In addition, the DCDC converter has the problem of poor power conversion efficiency. SUMMARY

[0003] The present application provides a power conversion device, a power supply control method, a power system, and a vehicle. By multiplexing a post-stage circuit of an on-board charger (OBC) and further improving the post-stage circuit, two DCDC converter branches are provided for a low-voltage load circuit in a power supply system of a vehicle (such as a new energy vehicle), which helps to improve the power conversion efficiency of the DCDC converter on the one hand, and on the other hand, still meets the power demand for long-time driving when one DCDC converter fails.

[0004] In a first aspect, a power conversion device is provided, comprising: a first power conversion circuit, comprising an OBC and a third sub-conversion circuit, wherein the OBC comprises a first sub-conversion circuit and a second sub-conversion circuit, the second sub-conversion circuit is electrically connected with a power battery, the third sub-conversion circuit is electrically connected with a load circuit, and the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit are coupled; and a second power conversion circuit, a first end of the second power conversion circuit is electrically connected with the load circuit, and a second end of the second power conversion circuit is electrically connected with the power battery.

[0005] For example, the first power conversion circuit described above can be used as a post-stage circuit of the OBC. Further, a resonant converter circuit used to constitute a DCDC converter can also comprise a metal oxide semiconductor (MOS) field effect transistor (MOS tube), including half-bridge and full-bridge architectures.

[0006] For example, the first sub-conversion circuit described above can be connected to one end of the alternating current to direct current (ACDC) converter in the DC-DC circuit of the OBC; the second sub-conversion circuit described above can be connected to one end of the power battery in the DC-DC circuit of the OBC. Based on this circuit structure, the first sub-conversion circuit and the second sub-conversion circuit are combined to form a DC-DC branch (i.e., a branch used to realize the function of the DC-DC circuit, which can also be called a DC-DC converter branch).

[0007] For example, the third sub-conversion circuit described above can also be combined with the second sub-conversion circuit to form another DC-DC branch.

[0008] For example, the first sub-conversion circuit described above can also be combined with the third sub-conversion circuit to form another DC-DC branch, which requires power input on the side of the first sub-conversion circuit to realize the DC-DC converter function of the branch.

[0009] Therefore, since the power conversion device described above can provide at least two DC-DC branches for the load circuit, namely the branch where the second power conversion circuit is located, and the branch where the third sub-conversion circuit and the second sub-conversion circuit are located, these two branches can share the power demand of the entire load circuit.

[0010] For example, under normal operating conditions of the load circuit, only the second power conversion circuit can be turned on to convert the electrical energy from the power battery and supply it to the load circuit. In some special scenarios, the power demand of the load circuit is large, making it impossible for the output power of the second power conversion circuit to meet the power demand of the load circuit. In such cases, the third sub-conversion circuit and the second sub-conversion circuit can be turned on to work together with the second power conversion circuit to provide the converted electrical energy, thereby meeting the large power demand of the load circuit.

[0011] For example, when there is a high energy feedback in the load circuit, the third sub-conversion circuit and the second sub-conversion circuit can be activated, or the second power conversion circuit can be activated to invert the feedback energy and charge the power battery with the inverted electrical energy, thereby improving the utilization rate of electrical energy and improving the overall utilization rate of electrical energy.

[0012] Based on the above technical scheme, through special circuit design, two DCDC converter branches are provided for the low-voltage load circuit in the power system of the new energy vehicle. On the one hand, the two DCDC converter branches can jointly share the power demand of the load circuit and adaptively adjust the total output power of the overall power conversion device. Since the second power conversion circuit mainly deals with the power demand of the load circuit under normal working conditions, and the power demand under normal working conditions is relatively low, it is easy to realize high power conversion efficiency of the second power conversion circuit. On the other hand, when one DCDC converter fails, the other DCDC can replace the failed DCDC converter to convert high-voltage direct current from the automatic power battery into low-voltage direct current for the low-voltage load circuit, thereby still meeting the power demand of the user for long-time driving. In addition, since the scheme mainly improves the internal circuit of one DCDC converter and the modification is small, the implementation difficulty and cost of the scheme are low.

[0013] With reference to the first aspect, in some implementations of the first aspect, the third sub-conversion circuit is configured to convert the voltage of the first sub-conversion circuit, the voltage of the second sub-conversion circuit, or the voltage of the load circuit.

[0014] With reference to the first aspect, in some implementations of the first aspect, the first power conversion circuit further includes a magnetic device, and the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit are coupled to each other through the magnetic device.

[0015] For example, the second end of the first sub-conversion circuit is provided with a first coil, the first end of the second sub-conversion circuit is provided with a second coil, the second end of the third sub-conversion circuit is provided with a third coil, and the magnetic device is located between the first coil and the second coil and between the third coil and the second coil. Based on the electromagnetic interaction between the magnetic device, the first coil, the second coil, and the third coil, voltage conversion between the first sub-conversion circuit and the second sub-conversion circuit and voltage conversion between the third sub-conversion circuit and the second sub-conversion circuit can be achieved.

[0016] Based on the above technical scheme, by multiplexing the magnetic device of the OBC rear circuit and the second sub-conversion circuit, the third sub-conversion circuit and the second sub-conversion circuit can form a DCDC branch, so that the structure of the power conversion device is changed little, which helps to control the manufacturing cost of the power conversion device.

[0017] With reference to the first aspect, in some implementations of the first aspect, the power conversion device further includes an integrated switching circuit, which is arranged between the second power conversion circuit and the third sub-conversion circuit.

[0018] In some implementations of the first aspect, the load circuit includes a first load circuit and a second load circuit, and the integrated switch circuit includes a first switch circuit, a second switch circuit, and a third switch circuit, wherein a first end of the first switch circuit is electrically connected to a second end of the second switch circuit and a first end of the third switch circuit, a second end of the first switch circuit is electrically connected to a first end of the second power conversion circuit, a first end of the second switch circuit is electrically connected to the first load circuit, a second end of the second switch circuit is also electrically connected to the first end of the third switch circuit, and a second end of the third switch circuit is electrically connected to the second load circuit and a first end of a third sub-conversion circuit.

[0019] According to the above technical solution, by arranging the integrated switch circuit, separate short circuit protection is performed on the branch where the second power conversion circuit is located, the branch where the second sub-conversion circuit and the third sub-conversion circuit are located, and the load circuit. When a short circuit occurs in at least one of these branches, the corresponding switch circuit is disconnected, the short-circuited element stops running due to the loss of power input, further damage to the short-circuited element is prevented, and further damage to the power conversion device and other circuits connected to the device caused by the short circuit current is also prevented, thereby improving the reliability and stability of the system.

[0020] In some implementations of the first aspect, the second switch circuit and the third switch circuit are configured to be in a closed state when the power conversion device is started.

[0021] According to the above technical solution, the conduction between the second power conversion circuit and the load circuit can be ensured when the device is started, so that the second power conversion circuit can be used as a DCDC branch for the load circuit by default.

[0022] In some implementations of the first aspect, the integrated switch circuit further includes a fourth switch circuit and a fifth switch circuit, a first end of the fourth switch circuit is electrically connected to the second load circuit, a second end of the fourth switch circuit is electrically connected to a second end of the third switch circuit and a first end of the fifth switch circuit, and a second end of the fifth switch circuit is electrically connected to a first end of the third sub-conversion circuit.

[0023] According to the above technical solution, by introducing the fourth switch circuit and the fifth switch circuit in the integrated switch circuit, separate short circuit protection can be performed on the branch where the third sub-conversion circuit is located and the second load circuit. When a short circuit occurs in at least one of these branches, the corresponding switch circuit is disconnected, the short-circuited element stops running due to the loss of power input, further damage to the short-circuited element is prevented, and further damage to the power conversion device and other circuits connected to the device caused by the short circuit current is also prevented, thereby improving the reliability and stability of the system.

[0024] With reference to the first aspect, in some implementations of the first aspect, the power conversion device further includes a third power conversion circuit, a first end of the third power conversion circuit being electrically connected with the load circuit and the integrated switching circuit, and a second end of the third power conversion circuit being electrically connected with a first end of a third sub-conversion circuit and the additional device, the working voltage of the additional device being different from the working voltage of the load circuit.

[0025] For example, the additional device can be a photovoltaic direct-current power supply or the like.

[0026] Based on the above technical solution, a branch of the third power conversion circuit is introduced into the power conversion device, so that the power conversion device can be compatible with power supply or output of multiple voltage values, and the compatibility and flexibility of the power conversion device are increased.

[0027] With reference to the first aspect, in some implementations of the first aspect, the additional device is a power supply device or a power consumption device.

[0028] Based on the above technical solution, the compatibility and flexibility of the power conversion device can be further increased.

[0029] With reference to the first aspect, in some implementations of the first aspect, the power conversion device further includes a fourth power conversion circuit, a first end of the fourth power conversion circuit being electrically connected with the alternating-current charger, and a second end of the fourth power conversion circuit being electrically connected with the first end of the first sub-conversion circuit.

[0030] The second aspect provides a method for controlling power supply, which is applied to a power conversion device, the power conversion device including a first power conversion circuit and a second power conversion circuit, the first power conversion circuit including an OBC and a third sub-conversion circuit, the OBC including a first sub-conversion circuit and a second sub-conversion circuit, the second sub-conversion circuit being electrically connected with a power battery, the third sub-conversion circuit being electrically connected with a load circuit, and the first sub-conversion circuit, the second sub-conversion circuit and the third sub-conversion circuit being coupled, a first end of the second power conversion circuit being electrically connected with the load circuit, and a second end of the second power conversion circuit being electrically connected with the power battery, the method including: when the power conversion device is started, controlling the second power conversion circuit to be turned on, and / or, controlling the second sub-conversion circuit and the third sub-conversion circuit to be turned on.

[0031] With reference to the second aspect, in some implementations of the second aspect, the load circuit includes a first load circuit and a second load circuit, and the power conversion device further includes an integrated switch circuit, the integrated switch circuit includes a first switch circuit, a second switch circuit, and a third switch circuit, a first end of the first switch circuit is electrically connected with a second end of the second switch circuit and a first end of the third switch circuit, a second end of the first switch circuit is electrically connected with a first end of the second power conversion circuit, a first end of the second switch circuit is electrically connected with the first load circuit, a second end of the second switch circuit is further electrically connected with the first end of the third switch circuit, a second end of the third switch circuit is electrically connected with the second load circuit and a first end of the third sub-conversion circuit, and the method further includes: controlling the first switch circuit and the second switch circuit to be closed when the second power conversion circuit is turned on; controlling the third switch circuit and the second switch circuit to be closed when the third sub-conversion circuit and the second sub-conversion circuit are turned on; controlling the first switch circuit to be opened when the second power conversion circuit is disabled; controlling the second switch circuit and / or the third switch circuit to be opened when the load circuit is disabled; and controlling the third switch circuit to be opened when the third sub-conversion circuit and / or the second sub-conversion circuit is disabled.

[0032] With reference to the second aspect, in some implementations of the second aspect, in response to the first instruction, the first switch circuit is controlled to be closed and the second power conversion circuit is controlled to be turned on, the first instruction is used to trigger the power conversion device to start; and in response to the first current information, at least one of the first switch circuit, the second switch circuit, and the third switch circuit is controlled to be opened or closed, the first current information includes at least one of the following: a first current passing through the first switch circuit, a second current passing through the second switch circuit, and a third current passing through the third switch circuit.

[0033] With reference to the second aspect, in some implementations of the second aspect, in response to the first current being greater than a first current threshold and less than a second current threshold, the third sub-conversion circuit and the second sub-conversion circuit are controlled to be turned on, or the third sub-conversion circuit and the first sub-conversion circuit are controlled to be turned on, or the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit are controlled to be turned on, the second current threshold is used to indicate a current when the second power conversion circuit is short-circuited.

[0034] With reference to the second aspect, in some implementations of the second aspect, in response to the first current being less than or equal to the first current threshold, the third sub-conversion circuit and / or the second sub-conversion circuit are controlled to be turned off, or the third sub-conversion circuit and / or the first sub-conversion circuit are controlled to be turned off, or at least one of the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit is controlled to be turned off.

[0035] In some embodiments of the second aspect, in response to the first current being greater than or equal to the second current threshold, the first switch circuit is controlled to be open; and / or, in response to the second current being greater than or equal to a third current threshold, the second switch circuit is controlled to be open, the third current threshold being indicative of a current when the first load circuit is short-circuited; and / or, in response to the third current being greater than or equal to a fourth current threshold, the third switch circuit is controlled to be open, the fourth current threshold being indicative of a current when the second load circuit is short-circuited; and / or, in response to the third current being greater than or equal to a fifth current threshold, the third switch circuit is controlled to be open, the fifth current threshold being indicative of a current when the branch in which the third sub-conversion circuit is located is short-circuited.

[0036] In some embodiments of the second aspect, in response to the first current being greater than or equal to the second current threshold, the second power conversion circuit is controlled to be off, and the third sub-conversion circuit and the second sub-conversion circuit are controlled to be on.

[0037] In some embodiments of the second aspect, in response to the third current being greater than or equal to the fifth current threshold, the third sub-conversion circuit and the second sub-conversion circuit are controlled to be off.

[0038] In some embodiments of the second aspect, the integrated switch circuit further comprises a fourth switch circuit and a fifth switch circuit, a first terminal of the fourth switch circuit being electrically connected to the second load circuit, a second terminal of the fourth switch circuit being electrically connected to a second terminal of the third switch circuit and a first terminal of the fifth switch circuit, a second terminal of the fifth switch circuit being electrically connected to the first terminal of the third sub-conversion circuit, and the method further comprises: when the second power conversion circuit is on, and / or, when the third sub-conversion circuit and the second sub-conversion circuit are on, controlling the fourth switch circuit and the fifth switch circuit to be closed; when the second load circuit is disabled, controlling the fourth switch circuit to be open; when the third sub-conversion circuit and / or the second sub-conversion circuit is disabled, controlling the fifth switch circuit to be open.

[0039] In some embodiments of the second aspect, in response to the second current information, the fourth switch circuit and / or the fifth switch circuit is controlled to be open or closed, the second current information comprising at least one of: a fourth current passing through the fourth switch circuit, and a fifth current passing through the fifth switch circuit.

[0040] In some implementations of the second aspect, in response to the fourth current being greater than or equal to a third current threshold, the fourth switch circuit is controlled to be open, the third current threshold being used to indicate a current when the first load circuit is short-circuited; and / or, in response to the fifth current being greater than or equal to a fifth current threshold, the fifth switch circuit is controlled to be open, the fifth current threshold being used to indicate a current when a branch in which the third sub-conversion circuit is located is short-circuited.

[0041] According to the above technical solution, by controlling the opening or closing of at least one switch circuit in the integrated switch circuit, individual short-circuit protection can be performed on the branch in which the second power conversion circuit is located, the branch in which the second sub-conversion circuit and the third sub-conversion circuit are located, and the load circuit. When short-circuit occurs in at least one of the branches, the corresponding switch circuit is opened, the short-circuited element stops running by losing power input, the short-circuited element is prevented from being further damaged by continuous power supply, and the power conversion device and other circuits connected to the device are prevented from being further damaged by short-circuit current, thereby improving the reliability and stability of the system.

[0042] In the third aspect, a device for controlling power supply is provided, which is applied to the power conversion device in the possible implementation of the first aspect. The device comprises a control unit configured to control the second power conversion circuit to be open when the power conversion device is started, and / or control the second sub-conversion circuit and the third sub-conversion circuit to be open.

[0043] In some implementations of the third aspect, the control unit is further configured to perform at least one of the following operations: when the second power conversion circuit is open, the first switch circuit and the second switch circuit are controlled to be closed; when the third sub-conversion circuit and the second sub-conversion circuit are open, the third switch circuit and the second switch circuit are controlled to be closed; when the second power conversion circuit is disabled, the first switch circuit is controlled to be open; when the load circuit is disabled, the second switch circuit and / or the third switch circuit is controlled to be open; and when the third sub-conversion circuit and / or the second sub-conversion circuit is disabled, the third switch circuit is controlled to be open.

[0044] In some implementations of the third aspect, the control unit is further configured to perform at least one of the following operations: when the second power conversion circuit is open, and / or when the third sub-conversion circuit and the second sub-conversion circuit are open, the fourth switch circuit and the fifth switch circuit are controlled to be closed; when the second load circuit is disabled, the fourth switch circuit is controlled to be open; and when the third sub-conversion circuit and / or the second sub-conversion circuit is disabled, the fifth switch circuit is controlled to be open.

[0045] In some embodiments of the third aspect, the control unit is further configured to: in response to the first instruction, control the first switch circuit to be closed and the second power conversion circuit to be turned on, the first instruction being used to trigger the power conversion device to start up; and in response to the first current information, control at least one of the first switch circuit, the second switch circuit, and the third switch circuit to be closed or opened, the first current information comprising at least one of the following: the first current flowing through the first switch circuit, the second current flowing through the second switch circuit, and the third current flowing through the third switch circuit.

[0046] In some embodiments of the third aspect, the control unit is further configured to: in response to the first current being greater than the first current threshold and less than the second current threshold, control the third sub-conversion circuit and the second sub-conversion circuit to be turned on, or control the third sub-conversion circuit and the first sub-conversion circuit to be turned on, or control the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit to be turned on, the second current threshold being used to indicate the current when the second power conversion circuit is short-circuited.

[0047] In some embodiments of the third aspect, the control unit is further configured to: in response to the sum of the first current and the third current being less than or equal to the first current threshold, control the third sub-conversion circuit and / or the second sub-conversion circuit to be turned off, or control the third sub-conversion circuit and / or the first sub-conversion circuit to be turned off, or control at least one of the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit to be turned off.

[0048] In some embodiments of the third aspect, the control unit is further configured to: in response to the first current being greater than or equal to the second current threshold, control the first switch circuit to be opened; and / or in response to the second current being greater than or equal to the third current threshold, control the second switch circuit to be opened, the third current threshold being used to indicate the current when the first load circuit is short-circuited; and / or in response to the third current being greater than or equal to the fourth current threshold, control the third switch circuit to be opened, the fourth current threshold being used to indicate the current when the second load circuit is short-circuited; and / or in response to the third current being greater than or equal to the fifth current threshold, control the third switch circuit to be opened, the fifth current threshold being used to indicate the current when the branch in which the third sub-conversion circuit is located is short-circuited.

[0049] In some embodiments of the third aspect, in response to the first current being greater than or equal to the second current threshold, the control unit is further configured to: control the second power conversion circuit to be turned off, and control the third sub-conversion circuit and the second sub-conversion circuit to be turned on.

[0050] In some implementations of the third aspect, in response to the third current being greater than or equal to the fifth current threshold, the third switch circuit is controlled to be open, the control unit is further configured to: control the third sub-conversion circuit and the second sub-conversion circuit to be closed.

[0051] In some implementations of the third aspect, in response to the second current information, the control unit is further configured to: control the fourth switch circuit and / or the fifth switch circuit to be open or closed, the second current information comprising at least one of the following: a fourth current passing through the fourth switch circuit, and a fifth current passing through the fifth switch circuit.

[0052] In some implementations of the third aspect, in response to the fourth current being greater than or equal to a third current threshold, the control unit is configured to control the fourth switch circuit to be open, the third current threshold being indicative of a current when the first load circuit is short-circuited. In addition, in response to the fifth current being greater than or equal to a fifth current threshold, the control unit is configured to control the fifth switch circuit to be open, the fifth current threshold being indicative of a current when the branch in which the third sub-conversion circuit is located is short-circuited.

[0053] In a fourth aspect, a power supply control device is provided, comprising a memory and a processor, the memory being configured to store a computer program, and the processor being configured to execute the computer program in the memory, so that the power supply control device can implement the method in any of the possible implementations of the second aspect.

[0054] In a fifth aspect, a power system is provided, comprising the power conversion device in any of the possible implementations of the first aspect, and the power supply control device in any of the possible implementations of the third aspect or the fourth aspect.

[0055] In a sixth aspect, a vehicle is provided, comprising the power system in the fifth aspect.

[0056] The vehicle in the present application is a vehicle in a broad sense, which can be a traffic tool (such as a commercial vehicle, a passenger vehicle, a motorcycle, a flying vehicle, a train, etc.), an industrial vehicle (such as a forklift, a trailer, a tractor, etc.), an engineering vehicle (such as an excavator, a bulldozer, a crane, etc.), an agricultural device (such as a mower, a harvester, etc.), a recreational device, a toy vehicle, etc. The type of the vehicle is not limited in the embodiments of the present application.

[0057] In a seventh aspect, a computer program product is provided, comprising computer program code, when the computer program code is executed on a computer, the computer is caused to execute the method in any of the possible implementations of the second aspect.

[0058] In an eighth aspect, a computer readable storage medium is provided, and the computer readable medium stores a computer program. When the computer program is run on a computer, the computer program causes the computer to execute the method in any possible implementation manner of the second aspect.

[0059] In a ninth aspect, a chip is provided, and the chip includes a circuit for executing the method in any possible implementation manner of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a functional block diagram of a vehicle 100 provided by an embodiment of the present application;

[0061] Figure 2 is a schematic diagram of an electric power system 200 architecture of a new energy vehicle commonly used at present;

[0062] Figure 3 is a circuit diagram of a power conversion device 300 provided by an embodiment of the present application;

[0063] Figure 4 is a circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0064] Figure 5 is a circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0065] Figure 6 is a circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0066] Figure 7 is a detailed circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0067] Figure 8 is a circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0068] Figure 9 is a detailed circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0069] Figure 10 is a circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0070] Figure 11 is a detailed circuit diagram of another power conversion device 300 provided by an embodiment of the present application;

[0071] Figure 12 is a flowchart of a method 1200 for controlling power supply provided by an embodiment of the present application;

[0072] Figure 13 is a schematic block diagram of a device 1300 for controlling power supply provided by an embodiment of the present application. DETAILED DESCRIPTION

[0073] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone.

[0074] In the embodiments of the present application, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two, "at least one" and "one or more" means one, two or more than two. The singular expression "one", "a kind", "the", "the above", "the" and "this" are intended to also include, for example, the expression "one or more", unless the context clearly indicates the opposite.

[0075] In the description of the present application, the reference to "one embodiment" or "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like appearing in the description are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0076] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0077] Figure 1Fig. 1 is a functional block diagram of a vehicle 100 according to an embodiment of the present application. The vehicle 100 can include a perception system 110, a computing platform 120, a display device 130, and an active suspension system 140. The perception system 110 can include one or more sensors that sense information about the environment surrounding the vehicle 100. For example, the perception system 110 can include a positioning system, which can be a global positioning system (GPS), a Beidou system, or another positioning system. The perception system 110 can also include one or more of an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0078] Some or all functions of the vehicle 100 can be controlled by the computing platform 120. The computing platform 120 can include one or more processors, such as processors 121 through 12n (n is a positive integer), which are circuits having a processing capability of signals. In one implementation, the processors can be circuits having an instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a kind of microprocessor), a digital signal processor (DSP), or the like. In another implementation, the processors can be circuits having a certain function implemented by a logic relationship of hardware circuits, which is fixed or reconfigurable. For example, the processors can be hardware circuits implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD) such as a field programmable gate array (FPGA). In the reconfigurable hardware circuit, the processor loads a configuration document to implement the hardware circuit configuration. It can be understood that the processor loads an instruction to implement the functions of the above part or all units. In addition, the processor can also be a hardware circuit designed for artificial intelligence, which can be understood as a kind of ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), or the like. In addition, the computing platform 120 can also include a memory for storing instructions, and some or all of the processors 121 through 12n can call and execute the instructions in the memory to implement corresponding functions.

[0079] The display devices 130 in the cabin are mainly divided into two categories, the first category is a vehicle display screen, and the second category is a projection display screen, such as a head-up display (HUD). The vehicle display screen is a physical display screen and is an important component of the in-vehicle infotainment system. Multiple display screens can be provided in the cabin, such as a digital instrument display screen, a central control screen, a display screen in front of a passenger at a front passenger seat (also referred to as a passenger in a front area), a display screen in front of a passenger at a left rear seat, and a display screen in front of a passenger at a right rear seat, and even a vehicle window can be used as a display screen for display. The head-up display, also known as a head-up display system, is mainly used to display driving information such as speed, navigation, etc. on a display device (such as a windshield) in front of the driver. In order to reduce the time of the driver's line of sight shift and avoid the change of the pupil caused by the driver's line of sight shift, the driving safety and comfort are improved. The HUD includes, for example, a combiner-HUD (C-HUD) system, a windshield-HUD (W-HUD) system, and an augmented reality HUD (AR-HUD). It should be understood that other types of systems can also appear as the technology evolves, and the present application does not limit this.

[0080] The power for implementing the operation of the above-mentioned device can be supplied by a power battery, but the power battery outputs high-voltage direct current, and most of the above-mentioned devices are low-voltage electrical devices, so the power battery needs to cooperate with a DCDC converter to convert the high-voltage direct current into low-voltage direct current and supply it to the above-mentioned device.

[0081] Figure 2 It is a commonly used new energy vehicle power system 200 architecture schematic diagram at this stage.

[0082] Reference Figure 2 As shown in the figure, the above-mentioned power system 200 includes an ACDC converter, a DCDC converter, and a power battery.

[0083] The input end of the ACDC converter is used to be connected with an alternating current charging device, the output end of the ACDC converter is connected with the power battery, and the ACDC converter is used to convert alternating current (such as household alternating current or alternating current provided by a charging pile) from the outside into direct current to charge the power battery.

[0084] The input end of the DCDC converter is connected with the power battery, and the output end of the DCDC converter is connected with a low-voltage load circuit, wherein the low-voltage load circuit can include a storage battery (such as 12V, 24V, etc. specifications) and multiple low-voltage electrical devices (such as lights, sound, control systems, etc.), so that the multiple low-voltage electrical devices can receive low-voltage direct current converted by the DCDC converter.

[0085] In addition, the DCDC converter can also have the function of filter rectification, that is, through intelligent switching technology, the direct current voltage or current is converted into a high-frequency square wave signal, and then through rectification and filtering, the fluctuations are converted into stable direct current output, thereby preventing voltage fluctuations or current surges from causing damage to electronic devices.

[0086] The power battery is used to store and provide electric energy to drive the vehicle. Based on the above description, the power battery can receive external alternating current for charging through the ACDC converter, and can also provide electric energy for the driving motor, DCDC converter and other high-voltage electrical equipment of the vehicle through the high-voltage cable and power distribution system, and work cooperatively with the DCDC converter to ensure stable power supply for the low-voltage system. When the vehicle is powered on or charged, the DCDC converter starts and adjusts the high-voltage direct current output by the power battery to provide appropriate voltage for the low-voltage system.

[0087] However, with the development of new energy vehicles, the DCDC converter, as one of the key components of electric vehicles, has become increasingly important.

[0088] The DCDC converter is used to convert the high-voltage direct current of the power battery into low-voltage direct current to provide stable and reliable power supply for the low-voltage electrical equipment of the vehicle (such as air conditioning, lighting, entertainment system, etc.). The DCDC converter not only plays a core role in the battery management system, but also participates in the voltage matching work in the battery charging process to ensure the stability and efficiency of the power supply from the high-voltage main battery to the electric motor.

[0089] In some possible embodiments, the DCDC converter can adjust the output voltage through electronic switching elements (such as transistors) and energy storage elements (such as inductors and capacitors) to achieve efficient and stable voltage conversion. These power supplies play a key role in accurately regulating the output voltage to meet the needs of different loads, mainly by controlling the duty cycle of the electronic switch.

[0090] However, when the DCDC converter fails, the low-voltage electrical equipment of the new energy vehicle will not be able to obtain stable power supply. At this time, if the vehicle is equipped with a storage battery as a backup power supply, it can temporarily provide power for these devices through the storage battery. However, the capacity of the storage battery is limited, and its power will gradually be depleted as the use time extends. If the DCDC converter cannot be repaired or replaced in time, the power of the storage battery will soon be depleted, and it will not be able to meet the user's demand for long-time driving.

[0091] It is found through research that the total power of low-voltage electrical equipment of a new energy vehicle usually does not exceed 1200W most of the time. However, in certain specific working conditions, such as high-power equipment like rapid starting air conditioner or audio system, the low-voltage power may reach more than 3000W for a short time. This means that the DCDC converter needs to maintain high conversion efficiency under different load conditions. Therefore, in the current vehicle power system design, the maximum power of the DCDC converter is designed according to the peak power of the entire power system. However, in most conventional vehicle electrical scenarios, the working power of the DCDC converter is usually much smaller than the peak power of the power system.

[0092] In the above background, the embodiments of the present application split the architecture of the DCDC converter into two branches. Branch 1 is used to meet the above-mentioned most conventional vehicle electrical scenarios, in which the load circuit power of the vehicle is usually less than the peak power of the power system. Branch 2 is used to make up for the insufficient output power of branch 1 in a few high-power electrical scenarios of the vehicle, and to take over the power supply task of branch 1 when branch 1 fails.

[0093] In view of this, the embodiments of the present application propose a power conversion circuit to replace the DCDC converter part circuit in the above-mentioned system 200. Through special circuit design, two DCDC converter branches are provided for the low-voltage load circuit in the power system of the new energy vehicle. On the one hand, the total output power of the overall DCDC converter can be adaptively adjusted. On the other hand, when one DCDC converter fails, the other DCDC can replace the failed DCDC converter to convert the high-voltage direct current from the power battery into low-voltage direct current for the low-voltage load circuit, so as to still meet the electrical demand of the user for long-time driving.

[0094] Figure 3 is a circuit diagram of a power conversion device 300 proposed by the embodiments of the present application. The device 300 is applied to the power system of a new energy vehicle.

[0095] Reference Figure 3 As shown in the figure, the device 300 includes:

[0096] The first power conversion circuit 310 includes an OBC and a third sub-conversion circuit 313, wherein the OBC includes a first sub-conversion circuit 311 and a second sub-conversion circuit 312, the second sub-conversion circuit 312 is electrically connected with the power battery 400, the third sub-conversion circuit 313 is electrically connected with the load circuit 500, and the first sub-conversion circuit 311, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 are coupled.

[0097] The second power conversion circuit 320 has a first end electrically connected to the load circuit 500 and a second end electrically connected to the power battery 400.

[0098] It should be understood that the power conversion device or the power conversion circuit proposed in the embodiments of the present application can play a role of voltage conversion, that is, can increase or decrease the input voltage to meet the voltage requirement of different loads.

[0099] It should be noted that the first end or the second end of the circuit mentioned in the embodiments of the present application does not limit the input end or the output end of the circuit. In the embodiments of the present application, the left end of the electronic element in the drawing is defined as the first end, and the right end of the electronic element in the drawing is defined as the second end. Therefore, the first end and the second end proposed in the embodiments of the present application are only used to distinguish the two ends of the circuit. Taking the first end of the second power conversion circuit 320 as an example, in some application scenarios, the first end of the second power conversion circuit 320 can be used as an input end of electric energy, which can be understood as the primary side of a transformer; in other application scenarios, the first end of the second power conversion circuit 320 can be used as an output end of electric energy, which can be understood as the secondary side of a transformer; the second end of the second power conversion circuit 320 and the two ends of other circuits are the same.

[0100] In some possible embodiments, the load circuit 500 described above can be a low-voltage load circuit in a vehicle power system, also known as a low-voltage load network, which can include a storage battery (such as 12V, 24V, etc.) and a plurality of low-voltage electrical devices (such as lighting, audio, control system, etc.), and the working voltage of these devices is much lower than the output voltage of the power battery.

[0101] In some possible embodiments, the third sub-conversion circuit 313 is configured to convert the voltage of the first sub-conversion circuit 311, the voltage of the second sub-conversion circuit 312, or the voltage of the load circuit 500.

[0102] In some possible embodiments, the first end of the first sub-conversion circuit 311 can be connected to the second end of an ACDC converter (also referred to as an ACDC circuit), and the first end of the ACDC converter is configured to be connected to an alternating current charging device. Based on the conversion function of the ACDC converter, the first end of the first sub-conversion circuit 311 can receive direct current converted by the ACDC converter.

[0103] In some possible embodiments, the ACDC converter can be used as a front-stage circuit of the OBC; further, a power factor correction circuit (PFC) is used to constitute the ACDC converter.

[0104] In some possible embodiments, the first power conversion circuit 310 described above can be used as a post-stage circuit of an OBC; further, a resonant conversion circuit (also referred to as an LLC circuit) used for constituting a DCDC converter (also referred to as a DCDC circuit), where L is used to represent an inductance, and C is used to represent a capacitance, and two inductances are a primary side leakage inductance and an excitation inductance of a transformer respectively, and the capacitance is a primary side resonant capacitance of the transformer. These elements constitute a resonant loop, where the input inductance and the output inductance are connected in series with the resonant capacitance respectively. The LLC circuit can also include a MOS tube, and then, according to the arrangement of the MOS tube in the LLC circuit, the LLC circuit can be divided into two architectures, i.e., a half-bridge architecture and a full-bridge architecture.

[0105] In some possible embodiments, the first power conversion circuit 310 described above further includes a magnetic device 314, and the first sub-conversion circuit 311, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 are coupled and connected through the magnetic device 314.

[0106] In some possible embodiments, the first sub-conversion circuit 311 is provided with a first coil at the second end, the second sub-conversion circuit 312 is provided with a second coil at the first end, the third sub-conversion circuit 313 is provided with a third coil at the second end, and the magnetic device 314 is located between the first coil and the second coil and between the third coil and the second coil. Based on the electromagnetic interaction between the magnetic device 314, the first coil, the second coil and the third coil, voltage conversion between the first sub-conversion circuit 311 and the second sub-conversion circuit 312 can be achieved, and voltage conversion between the third sub-conversion circuit 311 and the second sub-conversion circuit 312 can be achieved.

[0107] Therefore, the first sub-conversion circuit 311, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 share one magnetic device 314, and therefore, the first sub-conversion circuit 311, the second sub-conversion circuit 312 or the third sub-conversion circuit 313 is used to form one side of the transformer circuit, that is, the first sub-conversion circuit 311 and the second sub-conversion circuit 312 can form a DCDC branch based on the magnetic device 314, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 can also form a DCDC branch based on the magnetic device 314, and the first sub-conversion circuit 311 or the third sub-conversion circuit 313 can also form a DCDC branch based on the magnetic device 314, wherein the DCDC branch formed by the first sub-conversion circuit 311 and the second sub-conversion circuit 312 based on the magnetic device 314 can be used as the post-circuit of the OBC. Therefore, by multiplexing the magnetic device 314 of the post-circuit of the OBC and the second sub-conversion circuit 312, the third sub-conversion circuit 313 and the second sub-conversion circuit 312 can form a DCDC branch, so that the structure of the power conversion device is changed little, which helps to control the manufacturing cost of the power conversion device.

[0108] In some possible embodiments, the first sub-conversion circuit 311 can be connected to one end of the ACDC circuit in the DCDC circuit of the OBC; the second sub-conversion circuit 312 can be connected to one end of the power battery in the DCDC circuit of the OBC, and based on the circuit structure, the first sub-conversion circuit 311 and the second sub-conversion circuit 312 can be used to realize the function of the DCDC circuit.

[0109] In addition, the third sub-conversion circuit 313 can also be combined with the second sub-conversion circuit 312 to realize the DCDC circuit function for another branch.

[0110] Based on the above circuit design, the operation mechanism of the power conversion device 300 is as follows:

[0111] In the scenario of AC charging of the vehicle, at least the first sub-conversion circuit 311 and the second sub-conversion circuit 312 are started and take effect, receive the DC power input from the ACDC converter, and thus charge the power battery 400;

[0112] In the scenario of vehicle power consumption, the second power conversion circuit 320 is activated to receive high-voltage direct current provided by the power battery 400 and convert it into low-voltage direct current for supply to the load circuit 500; wherein the branch in which the second power conversion circuit 320 is located can serve as the main power supply line of the load circuit 500; of course, when the second power conversion circuit 320 fails (for example, short circuit, open circuit, etc.), the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are activated to receive high-voltage direct current provided by the power battery 400 and convert it into low-voltage direct current for supply to the load circuit 500, and the branch in which the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are located can serve as the standby power supply line of the load circuit; in addition, when the vehicle is in certain specific working conditions, such as rapid starting of air conditioning or high-power equipment such as a sound system, the second power conversion circuit 320 cannot meet the power demand of the current load circuit, so at this time the second power conversion circuit 320, the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are all activated to supply power to the load circuit 500 to meet the current large power demand of the load circuit 500.

[0113] In some possible embodiments, the load circuit 500 described above can further include a storage battery, in the scenario of vehicle power consumption, if the first power conversion circuit 310 and the second power conversion circuit 320 both fail, the load circuit 500 can be powered by the storage battery at this time, but in actual application, under normal driving conditions, the possibility of failure of the first power conversion circuit 310 and the second power conversion circuit 320 is very low. Of course, in the case of sufficient budget for vehicle cost, a DCDC converter branch can be further connected in parallel between the load circuit 500 and the power battery 400 to cope with the situation where the first power conversion circuit 310 and the second power conversion circuit 320 both fail and long-time driving is required.

[0114] Therefore, since the power conversion device 300 described above includes two DCDC branches, the two branches can jointly share the power demand of the entire load circuit.

[0115] In some possible embodiments, the specifications of the devices in the two DCDC branches can be selected based on the average power of the load circuit 500. Considering that the actual power of the load circuit is usually within the average power in the vehicle conventional power consumption scenario (i.e., the conventional working condition power interval), the high-efficiency interval of the electric energy conversion of the second power conversion circuit 320 needs to cover the average power of the load circuit, where the high-efficiency interval refers to the conversion efficiency of electric energy being greater than or equal to a specified threshold, which can be 92%, 94%, 96%, etc., and the threshold can be adaptively adjusted for different application scenarios. In addition, in order to meet the demand of the peak power of the load circuit, the total power of the two DCDC branches needs to be greater than or equal to the peak power.

[0116] For example, the conventional working condition power interval of the load circuit 500 is usually within the interval range of [0W, 1200W] or [0W, 1500W], and accordingly, the working power of the second power conversion circuit 320 can be designed to be within the interval range of [100W, 1200W] or [100W, 1500W], and the interval is the high-efficiency interval of the second power conversion circuit 320. In addition, since the peak power of the load circuit 500 is usually within 3000W, the working power corresponding to the third sub-conversion circuit 313 and the second sub-conversion circuit 312 can be designed to be greater than or equal to 2000W.

[0117] For example, in the vehicle conventional power consumption scenario, the power demand is usually within 1200W, at this time, only the second power conversion circuit 320 needs to be started to take effect, and in some special power consumption scenarios of the vehicle, for example, the power demand is 3000W, at this time, the second power conversion circuit 320, the third sub-conversion circuit 313 and the second sub-conversion circuit 312 need to be started to take effect, where the second power conversion circuit 320 is used to share the 1200W power demand, and the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are used to share the 1800W power demand.

[0118] It should be understood that since the second power conversion circuit 320 mainly copes with the power demand in the conventional working condition of the load circuit 500, and the power demand in the conventional working condition is relatively low, it is easy to realize that the second power conversion circuit 320 has a high electric energy conversion efficiency, so as to guarantee that the average efficiency of the electric power conversion of the second power conversion circuit 320 can reach a certain threshold requirement (for example, 96%) or more.

[0119] In some possible embodiments, the conversion power of the second power conversion circuit 320 described above can be in the range of [100 W, 1200 W], and the conversion power of the third sub-conversion circuit 313 and the second sub-conversion circuit 312 can be greater than or equal to 2000 W. The conversion power of the two circuits described above can also be adaptively adjusted according to different power requirements.

[0120] In addition, the first sub-conversion circuit 311 described above can also be combined with the third sub-conversion circuit 313 to form another branch for realizing the function of the DCDC circuit. The DCDC converter function of the branch can be realized only when the branch has a power input on the side of the first sub-conversion circuit 311.

[0121] Based on the circuit design described above, the operation mechanism of the power conversion device 300 is as follows:

[0122] In the scenario of AC charging of the vehicle, the load circuit 500 of the vehicle is still operating. At this time, the first sub-conversion circuit 311, the second sub-conversion circuit 312, and the third sub-conversion circuit 313 can be started and take effect to receive the direct current input from the ACDC converter. While charging the power battery 400, a part of the electric energy can also be supplied to the load circuit 500 through the third sub-conversion circuit 313 to meet the power demand of the load circuit 500.

[0123] In some possible embodiments, the load circuit 500 described above can further include a storage battery. In the scenario of vehicle power consumption, if the first power conversion circuit 310 and the second power conversion circuit 320 both fail, the storage battery can be used to supply power to the load circuit 500. However, in actual application, the possibility of failure of the first power conversion circuit 310 and the second power conversion circuit 320 is very low under normal driving conditions. Of course, in the case of sufficient budget for the cost of the vehicle, a DCDC converter branch can be further connected in parallel between the load circuit 500 and the power battery 400 to cope with the situation that the first power conversion circuit 310 and the second power conversion circuit 320 both fail and long-time driving is required.

[0124] In some possible embodiments, when the load circuit 500 has a high energy feedback, the third sub-conversion circuit 313 and the second sub-conversion circuit 312 described above are started and take effect to invert the feedback energy, and the electric energy obtained by inversion is charged back to the power battery 400, thereby improving the utilization rate of electric energy and the overall utilization rate of electric energy.

[0125] In some possible embodiments, the second end of the second power conversion circuit 320 can be connected to a specified node, and the second end of the second sub-conversion circuit 312 can also be connected to the specified node, and a line drawn from the specified node can be directly connected to one interface of the power battery 400.

[0126] In some possible embodiments, the second end of the second power conversion circuit 320 can be directly connected to one interface of the power battery 400, and the second end of the second sub-conversion circuit 312 can be connected to another interface of the power battery 400, and through the corresponding battery management device, the independent power transmission control of the second power conversion circuit 320 and the second sub-conversion circuit 312 can be realized.

[0127] In some possible embodiments, the power conversion device 300 can further include a fourth power conversion circuit 350, the first end of the fourth power conversion circuit 350 is electrically connected with the AC charger, and the second end of the fourth power conversion circuit 350 is electrically connected with the first end of the first sub-conversion circuit 311.

[0128] The second end of the fourth power conversion circuit 350 is electrically connected with the first end of the first sub-conversion circuit 311, and the second end of the fourth power conversion circuit 350 is used to output direct current. Based on the function and connection relationship of the fourth power conversion circuit 350, it can be known that the fourth power conversion circuit 350 can be an ACDC converter.

[0129] Based on the technical solution, through special circuit design, two DCDC converter branches are provided for the low-voltage load circuit in the power system of the new energy vehicle. On the one hand, the two DCDC converter branches can jointly share the power demand of the load circuit, and can adaptively adjust the total output power of the overall power conversion device 300. Since the second power conversion circuit 320 mainly deals with the power demand of the load circuit 500 under the conventional working condition, and the power demand under the conventional working condition is relatively low, the second power conversion circuit 320 is easy to realize high power conversion efficiency. On the other hand, when one DCDC converter fails, the other DCDC can replace the failed DCDC converter to convert the high-voltage direct current from the power battery into low-voltage direct current for the (low-voltage) load circuit 500, so that the power demand of the user for long-time driving can still be met. In addition, since the scheme mainly improves the internal circuit of one DCDC converter, and the modification is small, the implementation difficulty and cost of the scheme are low.

[0130] Furthermore, in order to further ensure the safety, practicality, and robustness of the power conversion device 300 circuit operation, this application embodiment proposes a power conversion device 300 that incorporates an integrated switching circuit, so as to promptly disconnect the branch where the first power conversion circuit 310 and / or the second power conversion circuit 320 are located when the first power conversion circuit 310 and / or the second power conversion circuit 320 are short-circuited, thereby avoiding further damage to the circuit components caused by the continuous short circuit of the first power conversion circuit 310 and / or the second power conversion circuit 320.

[0131] Figure 4 This is a circuit diagram of another power conversion device 300 proposed in the embodiments of this application.

[0132] refer to Figure 4 As shown, the power conversion device 300 may further include an integrated switch circuit 330, which is disposed between the second power conversion circuit 320 and the third sub-conversion circuit 313.

[0133] In some possible embodiments, when the second power conversion circuit 320 is short-circuited, the integrated switch circuit 330 will disconnect the line between the first power conversion circuit 310 and the second power conversion circuit 320, thereby preventing the first power conversion circuit 310 from being affected by the short circuit of the second power conversion circuit 320, so that the second sub-conversion circuit 312 and the third sub-conversion circuit 313 can supply power to the load circuit 500 independently.

[0134] In some possible embodiments, in the power conversion device 300, the integrated switching circuit 330 may include a first switching circuit 331 and a third switching circuit 333, wherein a first terminal of the first switching circuit 331 is electrically connected to the load circuit 500 and a first terminal of the third switching circuit 333, a second terminal of the first switching circuit 331 is electrically connected to a first terminal of the second power conversion circuit 320, a first terminal of the third switching circuit 333 is also electrically connected to the load circuit 500, and a second terminal of the third switching circuit 333 is electrically connected to a first terminal of the third sub-conversion circuit 313.

[0135] Figure 5 This is a circuit diagram of another power conversion device 300 proposed in the embodiments of this application.

[0136] refer to Figure 5 As shown, the first terminal of the first switching circuit 331 can be electrically connected to the second node N2, and the second terminal of the first switching circuit 331 is electrically connected to the first terminal of the second power conversion circuit 320; the first terminal of the third switching circuit 333 can also be electrically connected to the second node N2, and the second terminal of the third switching circuit 333 is electrically connected to the first terminal of the third sub-conversion circuit 313.

[0137] In some possible embodiments, the third switch circuit 333 remains closed when the vehicle is normally powered, but when a short circuit occurs during the operation of the second power conversion circuit 320, the first switch circuit 331 is opened, the third switch circuit 333 is closed, and the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are started, and the converted low-voltage direct current is input to the load circuit 500 through the circuit in which the third switch circuit is turned on.

[0138] In some possible embodiments, when the power demand of the load circuit 500 is large, the second power conversion circuit 320 cannot meet the power demand, at which time the first switch circuit 331 and the third switch circuit 333 need to be closed, and the power supply of the two DCDC converter branches is realized through the second power conversion circuit 320, the second sub-conversion circuit 312 and the third sub-conversion circuit 313. When it is determined that a short circuit occurs in the second power conversion circuit 320, the first switch circuit 331 is opened, and when it is determined that a short circuit occurs in the branch in which the second sub-conversion circuit 312 and the third sub-conversion circuit 313 are located, the third switch circuit 333 is opened.

[0139] In some possible embodiments, the load circuit 500 described above can include a first load circuit 510 and a second load circuit 520, and correspondingly, the integrated switch circuit 330 described above can include a first switch circuit 331, a second switch circuit 332 and a third switch circuit 333; wherein the first end of the first switch circuit 331 is electrically connected with the second end of the second switch circuit 332 and the first end of the third switch circuit 333, the second end of the first switch circuit 331 is electrically connected with the first end of the second power conversion circuit 320, the first end of the second switch circuit 332 is electrically connected with the first load circuit 510, the second end of the second switch circuit 332 is also electrically connected with the first end of the third switch circuit 333, and the second end of the third switch circuit 333 is electrically connected with the second load circuit 520 and the first end of the third sub-conversion circuit 313.

[0140] In some possible embodiments, the second switch circuit 332 and the third switch circuit 333 described above are configured to be in a closed state when the power conversion device is started. Based on this scheme, the conduction between the second power conversion circuit and the load circuit can be guaranteed when the device is started, so that the second power conversion circuit can be used as a DCDC branch for the load circuit by default.

[0141] The power conversion device 300 proposed in the embodiments described above can be realized through the following Figure 6 indicates.

[0142] Figure 6 is another circuit diagram of the power conversion device 300 proposed in the embodiments of the present application.

[0143] Reference Figure 6As shown, the first end of the first switch circuit 331 can be electrically connected to a first node N1, the second end of the first switch circuit 331 is electrically connected to the first end of the second power conversion circuit 320, and the first node N1 is located between the first switch circuit 331 and the second switch circuit 332; the first end of the second switch circuit 332 is electrically connected to the first load circuit 510, and the second end of the second switch circuit 332 can also be electrically connected to the first node N1; the first end of the third switch circuit 333 can also be electrically connected to the first node N1, and the second end of the third switch circuit 333 can also be electrically connected to a second node N2, and the second node N2 is located between the third sub-conversion circuit 313 and the second load circuit 520.

[0144] In some possible embodiments, the second switch circuit 332 and the third switch circuit 333 are closed by default, so that the load circuit can be powered by the second power conversion circuit 320 immediately after the vehicle is powered on.

[0145] Compared with the above Figure 5 As shown in the power conversion device 300, Figure 6 As shown in the power conversion device 300, the second switch circuit 332 can also be opened when the first load circuit 510 is short-circuited, so as to avoid the influence of the short circuit of the first load circuit 510 on other parts of the circuit and avoid the continuous power-on of the first load circuit 510 causing further damage to electronic elements. Therefore, the integrated switch circuit 330 can realize the connection or disconnection of the first load circuit 510 and the second load circuit 520, so as to guarantee the independence of the power supply of the two load circuits.

[0146] In some possible embodiments, the first load circuit 510 can also be connected to the storage battery 530 to serve as a backup power supply of the load circuit 500.

[0147] In some possible embodiments, the second power conversion circuit 320 can include an inverter switch circuit for feeding back the excess power of the load circuit 500 to the power battery, i.e., reverse inverter.

[0148] When the storage battery 530 fails, the load circuit 500 will output a larger energy feedback fluctuation, so when it is detected that the energy feedback fluctuation exceeds a set threshold, it is determined to start the reverse inverter function based on the inverter switch circuit, and then the converted power is fed back to the power battery 400 through the second end of the second power conversion circuit 320, so as to realize the recycling and reuse of energy.

[0149] For the convenience of understanding, the detailed circuit composition of the power conversion device 300 shown in the following is described. Figure 6

[0150] ​Figure 7 is a detailed circuit diagram of another power conversion device 300 proposed by embodiments of the present application.

[0151] In some possible embodiments, the first side circuit of the first power conversion circuit 310 includes a first sub-conversion circuit 311 and a third sub-conversion circuit 313, and the second side circuit of the first power conversion circuit 310 includes a second sub-conversion circuit 311. When the first side circuit is the primary side circuit of the first power conversion circuit 310, the second side circuit corresponds to the secondary side circuit of the first power conversion circuit 310; similarly, when the first side circuit is the secondary side circuit of the first power conversion circuit 310, the second side circuit corresponds to the primary side circuit of the first power conversion circuit 310, i.e., the first power conversion circuit 310 has an inverter function.

[0152] It should be noted that the transistors used in the embodiments of the present disclosure can be thin film transistors or field effect transistors or other devices with the same or similar characteristics. Since the first pole and the second pole of the transistor used are symmetrical, the first pole and the second pole are not distinguished. In the embodiments of the present disclosure, the control pole of the transistor specifically refers to the gate of the transistor; in order to distinguish the first pole and the second pole of the transistor, one of the poles is referred to as the first pole, the other pole is referred to as the second pole, and the gate is referred to as the control pole. In addition, according to the characteristics of the transistor, the transistor can be divided into N-type and P-type. In the following embodiments, the P-type transistor is used for illustration. When the P-type transistor is used, the first pole of the P-type transistor is the first pole, the second pole of the P-type transistor is the second pole, and the N-type is opposite. It is conceivable that the N-type transistor can be used to implement the technical solutions of the following embodiments, which can be easily thought of by those skilled in the art without creative labor, and therefore is also within the protection scope of the embodiments of the present disclosure.

[0153] In some possible embodiments, the first sub-conversion circuit 311 can include four transistors (T1 to T4), a capacitor (C1), and a coil (L1). The first pole of the transistor T1 is electrically connected to the node N3, the second pole of the transistor T1 is electrically connected to the node N4, the first pole of the transistor T2 is electrically connected to the node N5, the second pole of the transistor T2 is electrically connected to the node N3, the first pole of the transistor T3 is electrically connected to the node N6, the second pole of the transistor T3 is electrically connected to the node N4, the first pole of the transistor T4 is electrically connected to the node N5, and the second pole of the transistor T4 is electrically connected to the node N6. The capacitor C1 and the coil L1 are connected between the node N3 and the node N6. The potentials of the node N4 and the node N5 are consistent with the output potential of the fourth power conversion circuit 350.

[0154] In some possible embodiments, the second sub-conversion circuit 312 can include 4 transistors (T5 to T8), a capacitor (C2), and a coil (L2), wherein a first pole of the transistor T5 is electrically connected to the node N7, a second pole of the transistor T5 is electrically connected to the node N8, a first pole of the transistor T6 is electrically connected to the node N9, a second pole of the transistor T6 is electrically connected to the node N7, a first pole of the transistor T7 is electrically connected to the node N10, a second pole of the transistor T7 is electrically connected to the node N8, a first pole of the transistor T8 is electrically connected to the node N9, a second pole of the transistor T8 is electrically connected to the node N10, and the capacitor C2 and the coil L2 are connected between the node N7 and the node N10.

[0155] In some possible embodiments, the third sub-conversion circuit 313 can include 2 transistors (T9, T10), a capacitor (C3), and a coil (L3), wherein a first pole of the transistor T9 is electrically connected to a first end of the coil L3, a second pole of the transistor T9 is electrically connected to the node N11, the transistor T10 is electrically connected to a second end of the coil L3, a second pole of the transistor T10 is electrically connected to the node N11, the node N12 is further arranged above the coil L3, the node N12 divides the coil L3 into two parts, the capacitor C3 is connected in parallel between the node N11 and the node N12, and branches leading from the node N11 and the node N12 can be connected to the second power conversion circuit 320 and the load circuit 500.

[0156] In some possible embodiments, the first side circuit of the second power conversion circuit 320 can include 2 transistors (T11, T12), a capacitor (C4), and a coil (L4), wherein a first pole of the transistor T11 is electrically connected to a first end of the coil L4, a second pole of the transistor T11 is electrically connected to the node N13, the transistor T12 is electrically connected to a second end of the coil L4, a second pole of the transistor T12 is electrically connected to the node N13, the node N14 is further arranged above the coil L4, the node N14 divides the coil L4 into two parts, the capacitor C4 is connected in parallel between the node N13 and the node N14, and branches leading from the node N13 and the node N14 can be connected to the load circuit 500.

[0157] In some possible embodiments, the second side circuit of the second power conversion circuit 320 may include two transistors (T13, T14), three capacitors (C5, C6, C7), and a coil (L5). The first terminal of transistor T13 is electrically connected to node N15, the second terminal of transistor T13 is electrically connected to node N16, the first terminal of transistor T16 is electrically connected to node N17, and the second terminal of transistor T16 is electrically connected to node N15. One end of capacitor C6 is electrically connected to node N16, and the other end of capacitor C6 is electrically connected to node N18. One end of capacitor C7 is electrically connected to node N18, and the other end of capacitor C7 is electrically connected to node N17. The corresponding branch between node N15 and node N18 is connected to capacitor C5 and coil L5.

[0158] In some possible embodiments, the first switching circuit described above includes a MOSFET and a diode, wherein the first terminal of the MOSFET is electrically connected to the first terminal (anode) of the diode, and the second terminal of the MOSFET is electrically connected to the second terminal (cathode) of the diode.

[0159] For ease of description, the line leading out from the first pole connection node of the two electron tubes in the first switching circuit 331 is referred to as the first pole of the first switching circuit 331, and the line leading out from the second pole connection node of the two electron tubes in the first switching circuit 331 is referred to as the second pole of the first switching circuit 331. The same applies to other switching circuits.

[0160] Therefore, the first terminal of the first switching circuit 331 is electrically connected to the node N13, the second terminal of the first switching circuit 331 is electrically connected to the first node N1, the first terminal of the second switching circuit 332 is electrically connected to the first load circuit 510, the second terminal of the second switching circuit 332 is electrically connected to the first node N1, the second terminal of the third switching circuit 333 is electrically connected to the second node N2, the second node N2 is located between the second load circuit 520 and the node N11, and the first terminal of the third switching circuit 333 is electrically connected to the first node N1.

[0161] In some possible embodiments, the control electrode of the aforementioned transistor or MOSFET can be connected to a corresponding control circuit to control the transistor or MOSFET to turn on or off.

[0162] In some possible embodiments, the first load circuit 510 and the second load circuit 520 are connected in parallel, and the first load circuit 510 and the second load circuit 520 may be connected in parallel with the battery 530.

[0163] Based on the above technical solution, by setting the integrated switch circuit 330, the second power conversion circuit 320 branch, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 branch, and the load circuit 500 are separately short-circuit protected. When short-circuit occurs in at least one of the branches, the corresponding switch circuit is disconnected, the short-circuit element loses power input and stops running, preventing the short-circuit element from being continuously powered and further damaged, and preventing the short-circuit current from further damaging the power conversion device 300 and other circuits connected to the device 300, thereby improving the reliability and stability of the system.

[0164] In some possible embodiments, the integrated switch circuit 330 described above can further include a fourth switch circuit 334 and a fifth switch circuit 335, wherein the first end of the fourth switch circuit 334 is electrically connected to the second load circuit 520, the second end of the fourth switch circuit 334 is electrically connected to the second end of the third switch circuit 333 and the first end of the fifth switch circuit 335, and the second end of the fifth switch circuit 335 is electrically connected to the first end of the third sub-conversion circuit 313.

[0165] The power conversion device 300 proposed in the above embodiments can be realized by the following Figure 8 indicates.

[0166] Figure 8 is another circuit diagram of the power conversion device 300 proposed in the embodiments of the present application.

[0167] Referring to Figure 8 As shown in the figure, the first end of the fourth switch circuit 334 is electrically connected to the second load circuit 520, and the second end of the fourth switch circuit 334 is electrically connected to the second node N2; the first end of the fifth switch circuit 335 is electrically connected to the second node N2, and the second end of the fifth switch circuit 335 is electrically connected to the first end of the third sub-conversion circuit 313.

[0168] In some possible embodiments, when it is detected that the second load circuit 520 is short-circuited, the fourth switch circuit 334 can be disconnected, so that the second load circuit 520 is no longer powered, thereby protecting the electronic elements of the second load circuit 520 from being further damaged, and ensuring that other lines connected to the second load circuit 520 are not affected by the short-circuit of the second load circuit 520.

[0169] In some possible embodiments, when a short circuit is detected in the branch where the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are located, the fifth switch circuit 335 can be disconnected without the need to disconnect the third switch circuit 333, so that the second power conversion circuit 320 can take over the power supply task of the second load circuit 520, although the power demand of the load circuit 500 as a whole cannot be met, the situation that the second load circuit 520 loses power supply completely and all devices of the second load circuit 520 fail to function is avoided.

[0170] Figure 9 is another detailed circuit diagram of the power conversion device 300 proposed in the embodiments of the present application.

[0171] The Figure 9 is a detailed device display of the circuit diagram shown in Figure 8 different from the detailed circuit diagram shown in Figure 7 , the integrated switch circuit 330 of the power conversion device 300 shown in Figure 9 still needs to be provided with a fourth switch circuit 334 between the second load circuit 520 and the second node N2, and a fifth switch circuit 335 between the second node N2 and the first end of the third sub-conversion circuit 313, and the fourth switch circuit 334 and the fifth switch circuit 335 are the same as the first switch circuit 331, the second switch circuit 332 or the third switch circuit 333, which will not be repeated here.

[0172] In some possible embodiments, the first pole of the fourth switch circuit 334 is electrically connected to the second load circuit 520, and the second pole of the fourth switch circuit 334 is electrically connected to the second node N2; the first pole of the fifth switch circuit 335 is electrically connected to the first end of the third sub-conversion circuit 313, and the second pole of the fifth switch circuit 335 is electrically connected to the second node N2.

[0173] Based on the above technical solutions, by introducing the fourth switch circuit 334 and the fifth switch circuit 335 in the integrated switch circuit 330, the third sub-conversion circuit 313 branch and the second load circuit 520 can be individually protected from short circuit, and when a short circuit occurs in at least one of the branches, the corresponding switch circuit is disconnected, the short-circuited element stops running due to the loss of power input, preventing the short-circuited element from being further damaged by continuous power supply, and preventing the short-circuit current from causing further damage to the power conversion device 300 and other circuits connected to the device 300, thereby improving the reliability and stability of the system.

[0174] In some possible embodiments, the power conversion device 300 can further include a third power conversion circuit 340, a first end of the third power conversion circuit 340 being electrically connected to the load circuit 500 and the integrated switching circuit 330, and a second end of the third power conversion circuit 340 being electrically connected to a first end of the third sub-conversion circuit 313 and an additional device 600, the additional device 600 having a working voltage different from that of the load circuit 500.

[0175] The power conversion device 300 proposed in the above embodiments can be implemented by the following steps Figure 10

[0176] Figure 10 is another circuit diagram of the power conversion device 300 proposed in the embodiments of the present application.

[0177] Referring to Figure 10 The first end of the third power conversion circuit 340 can be electrically connected to the second node N2, and the second end of the third power conversion circuit 340 is electrically connected to the first end of the third sub-conversion circuit 313.

[0178] In addition, the power system can further include the additional device 600, which is electrically connected between the second end of the third power conversion circuit 340 and the first end of the third sub-conversion circuit 313.

[0179] In some possible embodiments, the additional device 600 is a power supply device or a power consumption device.

[0180] For example, assuming that the working voltage of the additional device 600 is greater than the output voltage of the second power conversion circuit 320 or the third sub-conversion circuit 313, the voltage requirement of the additional device 600 cannot be met, and thus the power requirement of the additional device 600 cannot be met, and based on the third power conversion circuit 340, the output voltage of the third sub-conversion circuit 313 can be converted to meet the working voltage of the additional device 600. The same applies to the case where the working voltage of the additional device 600 is less than the output voltage of the second power conversion circuit 320 or the third sub-conversion circuit 313, which is not repeated here.

[0181] For example, assuming that the additional device 600 is a power supply device, and since the working voltage of the additional device 600 is greater than the output voltage of the second power conversion circuit 320, it is also greater than the working voltage of the load circuit 500, and at this time, based on the third power conversion circuit 340, the output voltage of the additional device 600 can be converted to meet the working voltage of the load circuit 500.

[0182] ​For example, assuming that the auxiliary device 600 is a power supply device, since the operating voltage of the auxiliary device 600 is greater than the output voltage of the second power conversion circuit 320, the auxiliary device 600 can convert the output voltage of the auxiliary device 600 into an output voltage that matches the load circuit 500 through the third power conversion circuit 340, thereby sharing the power supply pressure of the storage battery 530 or the power battery 400.

[0183] Based on the above technical solution, a third power conversion circuit 340 branch is introduced into the power conversion device 300, which enables the power conversion device 300 to be compatible with power supply or output of multiple voltage values, thereby increasing the compatibility and flexibility of the power conversion device 300.

[0184] Figure 11 This is a detailed circuit diagram of another power conversion device 300 proposed in the embodiments of this application.

[0185] exist Figure 11 The circuit diagram shown is a simplified representation of the integrated switch circuit 330, only showing a portion of it. The integrated switch circuit 330 in this example is the one described above. Figure 8 or Figure 9 The integrated switch circuit 330 shown is illustrated; furthermore, reference numerals that are repeated in the figures of the foregoing embodiments are omitted, and only reference numerals related to the third power conversion circuit 340 are retained.

[0186] In some possible embodiments, the third power conversion circuit 340 described above may include: two transistors (T15, T16) and a coil L6, wherein the source of transistor T15 is electrically connected to node N19, the drain of transistor T15 is electrically connected to the drain of transistor T16 and one end of coil L6, the drain of transistor T16 is connected to node N20, wherein the capacitor C3 and the additional device 600 are connected in parallel between node N19 and node N20, and the other end of coil L6 may be electrically connected to the second end of the fifth switching circuit 335 described above.

[0187] It should be understood that any of the power conversion devices 300 proposed in the embodiments of this application can be combined with each other, and by combining the differences between multiple power conversion devices 300, power conversion devices 300 with other circuit configurations can be formed. For example, Figure 8 The power conversion device 300 shown is Figure 10 The power conversion devices shown are combined, Figure 3 The power conversion device shown is Figure 10 The power conversion devices shown are combined, etc.

[0188] In some possible embodiments, the power conversion device 300 proposed in the above description is combined, and a method for controlling power supply is correspondingly proposed. The method is used to control the working states of the integrated switching circuit 330 and the devices in the first power conversion circuit 310 and the second power conversion circuit 320, so as to realize the circuit states of the power conversion device 300 in different scenarios, to achieve different power conversion effects, and to trigger the circuit protection effect when the branch is short-circuited. The method can include the following operations:

[0189] In some possible embodiments, when the power conversion device 300 is started, the second power conversion circuit 320 is controlled to be turned on, and / or the second sub-conversion circuit 312 and the third sub-conversion circuit 313 are controlled to be turned on.

[0190] It should be understood that the above method can be applied to the power conversion device 300 shown in the above Figure 3

[0191] In some possible embodiments, when the power conversion device 300 is started, the second power conversion circuit 320 can be controlled to be turned on by default, and of course, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 can also be controlled to be turned on by default. Considering that the second power conversion circuit 320 is used to meet the conventional power demand of the load circuit 500 in the embodiments of the present application, the subsequent embodiments are described by taking the example that the second power conversion circuit 320 is controlled to be turned on by default when the power conversion device 300 is started.

[0192] After the second power conversion circuit 320 is turned on, when the output power of the second power conversion circuit 320 is out of limit, it indicates that the output power of the second power conversion circuit 320 cannot meet the power demand of the load circuit 500, at this time, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 can be controlled to be turned on to meet the power demand of the load circuit 500.

[0193] In some possible embodiments, the power conversion device 300 shown in the above Figure 6 or Figure 7 The integrated switching circuit 330 can also be controlled as follows:

[0194] When the second power conversion circuit 320 is turned on, the first switching circuit 331 and the second switching circuit 332 are controlled to be closed;

[0195] When the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are turned on, the third switching circuit 333 and the second switching circuit 332 are controlled to be closed;

[0196] When the second power conversion circuit 320 is disabled, the first switching circuit 331 is controlled to be disconnected;

[0197] ​When the load circuit 500 fails, the second switch circuit 332 and / or the third switch circuit 333 are controlled to be turned off.

[0198] When the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 fails, the third switch circuit 333 is controlled to be turned off.

[0199] It should be understood that the above five control operations can be reasonably combined, for example, when the second power conversion circuit 320 is turned on, the first switch circuit 331 and the second switch circuit 332 are controlled to be turned on; and during the operation of the second power conversion circuit 320, if the second power conversion circuit 320 fails, the first switch circuit 331 can be controlled to be turned off.

[0200] In some possible embodiments, when the above power conversion device 300 further includes the fourth switch circuit 334 and the fifth switch circuit 335, the method for controlling power supply can further include the following operations:

[0201] When the second power conversion circuit 320 is turned on, and / or when the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are turned on, the fourth switch circuit 334 and the fifth switch circuit 335 are controlled to be turned on.

[0202] When the second load circuit 520 fails, the fourth switch circuit 334 is controlled to be turned off.

[0203] When the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 fails, the fifth switch circuit 335 is controlled to be turned off.

[0204] In addition, the embodiments of the present application further propose the following detailed mechanism of the method for controlling power supply.

[0205] Figure 12 FIG. 12 is a flowchart of a method 1200 for controlling power supply according to an embodiment of the present application.

[0206] The method 1200 can be applied to the power conversion device 300 shown in the above Figure 6 or Figure 7 The method 1200 can include the following steps:

[0207] S1210: In response to a first instruction, the first switch circuit 331 is controlled to be turned on and the second power conversion circuit 320 is turned on, and the first instruction is used to trigger the power conversion device to start.

[0208] S1220: In response to the first current information, control at least one of the first switch circuit 331, the second switch circuit 332, and the third switch circuit 333 to be opened or closed, the first current information comprising at least one of the following: the first current flowing through the first switch circuit 331, the second current flowing through the second switch circuit 332, and the third current flowing through the third switch circuit 333.

[0209] In some possible embodiments, the above S1220 can include the following operations:

[0210] S1230: In response to the first current being greater than the first current threshold and less than the second current threshold, control the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be turned on, or control the third sub-conversion circuit 313 and the first sub-conversion circuit 311 to be turned on, or control the first sub-conversion circuit 311, the second sub-conversion circuit 312, and the third sub-conversion circuit 313 to be turned on, the second current threshold being used to indicate the current when the second power conversion circuit 320 is short-circuited.

[0211] In some possible embodiments, the above first current threshold and second current threshold can be pre-configured, and the two thresholds can be obtained through circuit experiments.

[0212] In some possible embodiments, the above S1220 can further include the following operations:

[0213] S1240: In response to the sum of the first current and the third current being less than or equal to the first current threshold, control the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 to be turned off, or control the third sub-conversion circuit 313 and / or the first sub-conversion circuit 311 to be turned off, or control at least one of the first sub-conversion circuit 311, the second sub-conversion circuit 312, and the third sub-conversion circuit 313 to be turned off.

[0214] In some possible embodiments, the above S1220 can be performed through the following mechanisms:

[0215] S1222: In response to the first current being greater than or equal to the second current threshold, control the first switch circuit 331 to be opened.

[0216] And / or, S1224: In response to the second current being greater than or equal to the third current threshold, control the second switch circuit 332 to be opened, the third current threshold being used to indicate the current when the first load circuit 510 is short-circuited.

[0217] And / or, S1226: In response to the third current being greater than or equal to the fourth current threshold, control the third switch circuit 333 to be opened, the fourth current threshold being used to indicate the current when the second load circuit 520 is short-circuited.

[0218] And / or, S1228: in response to the third current being greater than or equal to a fifth current threshold, controlling the third switch circuit 333 to be open, the fifth current threshold being used to indicate a current when a short circuit occurs in the branch where the third sub-conversion circuit 313 is located.

[0219] In some possible embodiments, in the case where the first switch circuit 331 is controlled to be open in response to the first current being greater than or equal to the second current threshold, the above method 1200 can further perform the following operation:

[0220] S1250: controlling the second power conversion circuit 320 to be closed, and controlling the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be open.

[0221] In some possible embodiments, in the case where the third switch circuit 333 is controlled to be open in response to the third current being greater than or equal to the fifth current threshold, the above method 1200 can further perform the following operation:

[0222] S1260: controlling the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be closed.

[0223] In some possible embodiments, in the case where the power conversion device 300 further comprises the fourth switch circuit 334 and the fifth switch circuit 335, the above method 1200 can further perform the following operation:

[0224] S1270: in response to second current information, controlling the fourth switch circuit 334 and / or the fifth switch circuit 335 to be open or closed, the second current information comprising at least one of the following: a fourth current passing through the fourth switch circuit 334, and a fifth current passing through the fifth switch circuit 335.

[0225] In some possible embodiments, the above S1270 can be performed by the following mechanisms:

[0226] S1272: in response to the fourth current being greater than or equal to a third current threshold, controlling the fourth switch circuit 334 to be open, the third current threshold being used to indicate a current when the first load circuit 510 is short-circuited.

[0227] And / or, S1274: in response to the fifth current being greater than or equal to a fifth current threshold, controlling the fifth switch circuit 335 to be open, the fifth current threshold being used to indicate a current when a short circuit occurs in the branch where the third sub-conversion circuit 313 is located.

[0228] In some possible embodiments, the on and off of each of the above-mentioned switching circuits and each of the power conversion circuits can be controlled by a circuit controller integrated in the power supply system of the vehicle, which can belong to the battery management system (BMS) of the vehicle.

[0229] In some possible embodiments, the above-mentioned circuit parameter information such as the first current information and the second current information can be obtained by the BMS.

[0230] Based on the above technical solutions, by controlling the switching state of the integrated switching circuit 330 according to the current information, on the one hand, the two DCDC converter branches included in the power conversion device 300 can jointly share the power demand of the load circuit, and the total output power of the overall DCDC converter can be adaptively adjusted; on the other hand, when one DCDC converter fails, the other DCDC can be controlled to replace the failed DCDC converter to convert the high-voltage direct current from the traction battery into low-voltage direct current for supplying the low-voltage load circuit, so that the power demand of the user for long-time driving can still be met. Moreover, when short circuit occurs in at least one branch of the multiple branches connected by the integrated switching circuit, the corresponding switching circuit is disconnected accordingly, the short-circuited element stops running by losing power input, the short-circuited element is prevented from being further damaged by continuous power input, and the short-circuit current is prevented from causing further damage to the power conversion device 300 and other circuits connected to the device 300, thereby improving the reliability and stability of the system.

[0231] In addition, the embodiments of the present application also provide a device for implementing any one of the above methods, for example, a device for controlling power supply is provided, which comprises units (or means) for implementing any one of the above control methods.

[0232] Figure 13 is a schematic block diagram of a device 1300 for controlling power supply provided by the embodiments of the present application. The device 1300 comprises:

[0233] The control unit 1310 is configured to control the second power conversion circuit 320 to be turned on and / or control the second sub-conversion circuit 312 and the third sub-conversion circuit 313 to be turned on when the power conversion device 300 is started.

[0234] It should be understood that the above method can be applied to the power conversion device 300 shown in the above Figure 3 .

[0235] In some possible embodiments, the control unit 1310 is further configured to perform at least one of the following operations: when the second power conversion circuit 320 is turned on, controlling the first switch circuit 331 and the second switch circuit 332 to be closed; when the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are turned on, controlling the third switch circuit 333 and the second switch circuit 332 to be closed; when the second power conversion circuit 320 is turned off, controlling the first switch circuit 331 to be opened; when the load circuit 500 is turned off, controlling the second switch circuit 332 and / or the third switch circuit 333 to be opened; when the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 is turned off, controlling the third switch circuit 333 to be opened.

[0236] In some possible embodiments, the control unit 1310 is further configured to perform at least one of the following operations: when the second power conversion circuit 320 is turned on, and / or, when the third sub-conversion circuit 313 and the second sub-conversion circuit 312 are turned on, controlling the fourth switch circuit 334 and the fifth switch circuit 335 to be closed; when the second load circuit 520 is turned off, controlling the fourth switch circuit 334 to be opened; when the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 is turned off, controlling the fifth switch circuit 335 to be opened.

[0237] In some possible embodiments, the control unit 1310 is further configured to: in response to a first instruction, controlling the first switch circuit 331 to be closed and the second power conversion circuit 320 to be turned on, the first instruction being used to trigger the power conversion device to start; in response to first current information, controlling at least one of the first switch circuit 331, the second switch circuit 332 and the third switch circuit 333 to be opened or closed, the first current information comprising at least one of the following: a first current passing through the first switch circuit 331, a second current passing through the second switch circuit 332 and a third current passing through the third switch circuit 333.

[0238] In some possible embodiments, the control unit 1310 is further configured to: in response to the first current being greater than a first current threshold and less than a second current threshold, controlling the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be turned on, or, controlling the third sub-conversion circuit 313 and the first sub-conversion circuit 311 to be turned on, or, controlling the first sub-conversion circuit 311, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 to be turned on, the second current threshold being used to indicate a current when the second power conversion circuit 320 is short-circuited.

[0239] In some possible embodiments, the control unit 1310 is further configured to, in response to the sum of the first current and the third current being less than or equal to a first current threshold, control the third sub-conversion circuit 313 and / or the second sub-conversion circuit 312 to be turned off, or control the third sub-conversion circuit 313 and / or the first sub-conversion circuit 311 to be turned off, or control at least one of the first sub-conversion circuit 311, the second sub-conversion circuit 312 and the third sub-conversion circuit 313 to be turned off.

[0240] In some possible embodiments, the control unit 1310 is specifically configured to, in response to the first current being greater than or equal to a second current threshold, control the first switch circuit 331 to be turned off. And / or, in response to the second current being greater than or equal to a third current threshold, control the second switch circuit 332 to be turned off, the third current threshold being used to indicate a current when the first load circuit 510 is short-circuited. And / or, in response to the third current being greater than or equal to a fourth current threshold, control the third switch circuit 333 to be turned off, the fourth current threshold being used to indicate a current when the second load circuit 520 is short-circuited. And / or, in response to the third current being greater than or equal to a fifth current threshold, control the third switch circuit 333 to be turned off, the fifth current threshold being used to indicate a current when a branch in which the third sub-conversion circuit 313 is located is short-circuited.

[0241] In some possible embodiments, in the case where the control unit 1310 controls the first switch circuit 331 to be turned off in response to the first current being greater than or equal to the second current threshold, the control unit 1310 is further configured to control the second power conversion circuit 320 to be turned off and control the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be turned on.

[0242] In some possible embodiments, in the case where the control unit 1310 controls the third switch circuit 333 to be turned off in response to the third current being greater than or equal to the fifth current threshold, the control unit 1310 is further configured to control the third sub-conversion circuit 313 and the second sub-conversion circuit 312 to be turned off.

[0243] In some possible embodiments, in the case where the power conversion device 300 further comprises the fourth switch circuit 334 and the fifth switch circuit 335, the control unit 1310 is further configured to, in response to second current information, control the fourth switch circuit 334 and / or the fifth switch circuit 335 to be turned off or turned on, the second current information comprising at least one of the following: a fourth current passing through the fourth switch circuit 334, and a fifth current passing through the fifth switch circuit 335.

[0244] In some possible embodiments, the control unit is specifically configured to: in response to the fourth current being greater than or equal to a third current threshold, control the fourth switch circuit 334 to be turned off, the third current threshold being used to indicate a current when the first load circuit 510 is short-circuited; and / or in response to the fifth current being greater than or equal to a fifth current threshold, control the fifth switch circuit 335 to be turned off, the fifth current threshold being used to indicate a current when the branch in which the third sub-conversion circuit 313 is located is short-circuited.

[0245] The embodiments of the present application further provide a device for controlling power supply, which comprises a processor and a memory, wherein the memory is configured to store instructions, and the processor is configured to execute the instructions stored in the memory, so that the device performs the method or the steps performed by the above-mentioned embodiments.

[0246] Optionally, the device for controlling power supply is located in a vehicle, and the processor can be one or more of the processors 121-12n shown. Figure 1

[0247] The embodiments of the present application further provide an electric power system, which comprises any one of the power conversion devices 300 provided by the embodiments of the present application, and comprises any one of the devices for controlling power supply 1300 provided by the embodiments of the present application.

[0248] The embodiments of the present application further provide a vehicle, which can comprise any one of the electric power systems provided by the embodiments of the present application.

[0249] The embodiments of the present application further provide a computer program product, which comprises computer program codes, and when the computer program codes are run on a computer, the computer is caused to perform the method in the above-mentioned embodiments.

[0250] The embodiments of the present application further provide a computer readable medium, which stores program codes, and when the program codes are run on a computer, the computer is caused to perform the method in the above-mentioned embodiments.

[0251] The embodiments of the present application further provide a chip, which comprises a circuit configured to perform the method in the above-mentioned embodiments.

[0252] ​In the implementation process, each step of the above method can be completed by integrated logic circuit of hardware in the processor or instruction in the form of software. The method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0253] It should be understood that in the embodiments of the present application, the memory can include read-only memory and random access memory, and provide instructions and data to the processor.

[0254] It should also be understood that in various embodiments of the present application, the size of the sequence number of each process described above does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0255] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0256] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0257] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed mutual ones can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0258] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0259] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0260] The functions, if realized in the form of software functional units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0261] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power conversion device, characterized in that, The power conversion device includes: The first power conversion circuit includes an on-board charger (OBC) and a third sub-conversion circuit. The OBC includes a first sub-conversion circuit and a second sub-conversion circuit. The second sub-conversion circuit is electrically connected to the power battery, and the third sub-conversion circuit is electrically connected to the load circuit. The first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit are coupled together. The second power conversion circuit has a first terminal electrically connected to the load circuit and a second terminal electrically connected to the power battery.

2. The power conversion device according to claim 1, characterized in that, The third sub-conversion circuit is used to convert the voltage of the first sub-conversion circuit, the voltage of the second sub-conversion circuit, or the voltage of the load circuit.

3. The power conversion device according to claim 1 or 2, characterized in that, The first power conversion circuit further includes a magnetic device, and the first sub-conversion circuit, the second sub-conversion circuit and the third sub-conversion circuit are coupled together through the magnetic device.

4. The power conversion device according to any one of claims 1 to 3, characterized in that, The power conversion device further includes: An integrated switching circuit is disposed between the second power conversion circuit and the third sub-conversion circuit.

5. The power conversion device according to claim 4, characterized in that, The load circuit includes a first load circuit and a second load circuit. The integrated switch circuit includes a first switch circuit, a second switch circuit, and a third switch circuit. The first terminal of the first switch circuit is electrically connected to the second terminal of the second switch circuit and the first terminal of the third switch circuit. The second terminal of the first switch circuit is electrically connected to the first terminal of the second power conversion circuit. The first terminal of the second switch circuit is electrically connected to the first load circuit. The second terminal of the second switch circuit is also electrically connected to the first terminal of the third switch circuit. The second terminal of the third switch circuit is electrically connected to the first terminal of the second load circuit and the third sub-conversion circuit.

6. The power conversion device according to claim 5, characterized in that, The second and third switching circuits are configured to be in a closed state when the power conversion device is started.

7. The power conversion device according to claim 5 or 6, characterized in that, The integrated switching circuit further includes a fourth switching circuit and a fifth switching circuit. The first terminal of the fourth switching circuit is electrically connected to the second load circuit. The second terminal of the fourth switching circuit is electrically connected to the second terminal of the third switching circuit and the first terminal of the fifth switching circuit. The second terminal of the fifth switching circuit is connected to the first terminal of the third sub-conversion circuit.

8. The power conversion device according to any one of claims 4 to 7, characterized in that, The power conversion device further includes: The third power conversion circuit has its first terminal electrically connected to the load circuit and the integrated switch circuit, and its second terminal electrically connected to the first terminal of the third sub-conversion circuit and an auxiliary device. The operating voltage of the auxiliary device is different from that of the load circuit.

9. The power conversion device according to claim 8, characterized in that, The additional equipment is a power supply device or an electrical appliance.

10. The power conversion device according to any one of claims 1 to 9, characterized in that, The power conversion device further includes: A fourth power conversion circuit, wherein the first terminal of the fourth power conversion circuit is electrically connected to the AC charger, and the second terminal of the fourth power conversion circuit is electrically connected to the first terminal of the first sub-conversion circuit.

11. A method for power supply control, characterized in that, An application is made in a power conversion device, the power conversion device comprising: a first power conversion circuit and a second power conversion circuit, the first power conversion circuit comprising an OBC and a third sub-conversion circuit, the OBC comprising the first sub-conversion circuit and the second sub-conversion circuit, the second sub-conversion circuit being electrically connected to a power battery, the third sub-conversion circuit being electrically connected to a load circuit, and the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit being coupled together, a first terminal of the second power conversion circuit being electrically connected to the load circuit, and a second terminal of the second power conversion circuit being electrically connected to the power battery, the method comprising: When the power conversion device is started, the second power conversion circuit is controlled to turn on, and / or the second sub-conversion circuit and the third sub-conversion circuit are controlled to turn on.

12. The method according to claim 11, characterized in that, The load circuit includes a first load circuit and a second load circuit. The power conversion device further includes an integrated switching circuit, which includes a first switching circuit, a second switching circuit, and a third switching circuit. A first terminal of the first switching circuit is electrically connected to a second terminal of the second switching circuit and a first terminal of the third switching circuit. A second terminal of the first switching circuit is electrically connected to a first terminal of the second power conversion circuit. A first terminal of the second switching circuit is electrically connected to the first load circuit. A second terminal of the second switching circuit is also electrically connected to a first terminal of the third switching circuit. A second terminal of the third switching circuit is electrically connected to a first terminal of the second load circuit and a first terminal of the third sub-conversion circuit. The method further includes: When the second power conversion circuit is turned on, the first switching circuit and the second switching circuit are controlled to close. When the third sub-conversion circuit and the second sub-conversion circuit are turned on, the third switching circuit and the second switching circuit are controlled to be closed. When the second power conversion circuit fails, the first switching circuit is controlled to disconnect. When the load circuit fails, the second switching circuit and / or the third switching circuit are controlled to disconnect. When the third sub-conversion circuit and / or the second sub-conversion circuit fail, the third switching circuit is controlled to disconnect.

13. The method according to claim 12, characterized in that, The method further includes: In response to a first instruction, the first switching circuit is closed and the second power conversion circuit is turned on, wherein the first instruction is used to trigger the power conversion device to start. In response to a first current information, at least one of the first switching circuit, the second switching circuit, and the third switching circuit is controlled to open or close. The first current information includes at least one of the following: a first current passing through the first switching circuit, a second current passing through the second switching circuit, and a third current passing through the third switching circuit.

14. The method according to claim 13, characterized in that, The method further includes: In response to the first current being greater than a first current threshold and less than a second current threshold, the third sub-conversion circuit and the second sub-conversion circuit are controlled to be turned on, or the third sub-conversion circuit and the first sub-conversion circuit are controlled to be turned on, or the first sub-conversion circuit, the second sub-conversion circuit and the third sub-conversion circuit are controlled to be turned on, wherein the second current threshold is used to indicate the current when the second power conversion circuit is short-circuited.

15. The method according to claim 14, characterized in that, The method further includes: In response to the first current being less than or equal to the first current threshold, the third sub-conversion circuit and / or the second sub-conversion circuit are controlled to shut down, or the third sub-conversion circuit and / or the first sub-conversion circuit are controlled to shut down, or at least one of the first sub-conversion circuit, the second sub-conversion circuit, and the third sub-conversion circuit is controlled to shut down.

16. The method according to claim 14 or 15, characterized in that, The step of controlling at least one of the first switching circuit, the second switching circuit, and the third switching circuit to open or close in response to the first current information includes: In response to the first current being greater than or equal to the second current threshold, the first switching circuit is controlled to open; and / or, In response to the second current being greater than or equal to a third current threshold, the second switching circuit is controlled to disconnect, the third current threshold indicating the current when the first load circuit is short-circuited; and / or, In response to the third current being greater than or equal to a fourth current threshold, the third switching circuit is controlled to disconnect, the fourth current threshold indicating the current when the second load circuit is short-circuited; and / or, In response to the third current being greater than or equal to the fifth current threshold, the third switching circuit is controlled to open, and the fifth current threshold is used to indicate the current when a short circuit occurs in the branch where the third sub-conversion circuit is located.

17. The method according to claim 16, characterized in that, When the first switching circuit is controlled to disconnect in response to the first current being greater than or equal to the second current threshold, the method further includes: The second power conversion circuit is turned off, and the third sub-conversion circuit and the second sub-conversion circuit are turned on.

18. The method according to claim 16 or 17, characterized in that, When the third switching circuit is controlled to disconnect in response to the third current being greater than or equal to the fifth current threshold, the method further includes: The third sub-conversion circuit and the second sub-conversion circuit are controlled to shut down.

19. The method according to any one of claims 12 to 18, characterized in that, The integrated switching circuit further includes a fourth switching circuit and a fifth switching circuit. The first terminal of the fourth switching circuit is electrically connected to the second load circuit. The second terminal of the fourth switching circuit is electrically connected to the second terminal of the third switching circuit and the first terminal of the fifth switching circuit. The second terminal of the fifth switching circuit is connected to the first terminal of the third sub-conversion circuit. The method further includes: When the second power conversion circuit is turned on, and / or when the third sub-conversion circuit and the second sub-conversion circuit are turned on, the fourth switch circuit and the fifth switch circuit are controlled to close. When the second load circuit fails, the fourth switching circuit is controlled to disconnect. When the third sub-conversion circuit and / or the second sub-conversion circuit fail, the fifth switching circuit is controlled to disconnect.

20. The method according to claim 19, characterized in that, The method further includes: In response to the second current information, the fourth switching circuit and / or the fifth switching circuit are controlled to open or close, wherein the second current information includes at least one of the following: the fourth current passing through the fourth switching circuit and the fifth current passing through the fifth switching circuit.

21. The method according to claim 20, characterized in that, The step of controlling the fourth switching circuit and / or the fifth switching circuit to open or close in response to the second current information includes: In response to the fourth current being greater than or equal to the third current threshold, the fourth switching circuit is controlled to disconnect, the three current thresholds being used to indicate the current when the first load circuit is short-circuited; and / or, In response to the fifth current being greater than or equal to the fifth current threshold, the fifth current threshold is controlled to open the fifth switching circuit. The fifth current threshold is used to indicate the current when a short circuit occurs in the branch where the third sub-conversion circuit is located.

22. A device for controlling power supply, characterized in that, Includes modules or units for performing the method as described in any one of claims 11 to 21.

23. A device for controlling power supply, characterized in that, include: Memory, used to store computer programs; A processor for executing a computer program stored in the memory to cause the apparatus to perform the method as described in any one of claims 11 to 21.

24. An electric power system, characterized in that, It includes the power conversion device as described in any one of claims 1 to 10, and the device as described in claim 22 or 23.

25. A vehicle, characterized in that, Including the power system as described in claim 24.

26. A computer-readable storage medium, characterized in that, It stores instructions that, when executed by a processor, cause the processor to implement the method as described in any one of claims 11 to 21.

27. A computer program product, characterized in that, The computer program product includes computer program code that, when run on a computer, causes the computer to perform the method as described in any one of claims 11 to 21.

28. A chip, characterized in that, The chip includes circuitry for performing the method as described in any one of claims 11 to 21.

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