Vehicle-mounted power supply device, power assembly and vehicle

Abstract

The utility model provides a vehicle-mounted power supply device, a power assembly and a vehicle. The vehicle-mounted power supply device comprises a control module, a direct current bus and a plurality of direct current branches. Each direct current branch comprises a branch power switch tube, the direct current bus receives power supplied by a vehicle-mounted power supply and supplies power to a plurality of loads through a plurality of direct current branches, and each branch power switch tube is used for connecting or disconnecting one direct current branch; the control module is used for setting current threshold values of the multiple direct current branches, namely the maximum current value of one direct current branch. When the load is started, when the branch power switch tube of one direct-current branch and the load connected with the branch power switch tube have no fault, the control module controls the branch power switch tube of the direct-current branch to be switched on. And when the current of one direct-current branch is greater than or equal to the current threshold value of the direct-current branch, the control module controls the branch power switch tube of the direct-current branch to be switched off. The vehicle-mounted power supply device uses the control module and the branch power switch tube to protect the circuit, and is intelligent and cost-reducing.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a vehicle-mounted power supply device, a power assembly and a vehicle. Background Art

[0002] The existing protection technology solution for the vehicle electrical system circuit is usually to configure a fuse separately for each branch where the load is located. When an excessive current passes through the fuse, the fuse blows, thereby disconnecting the circuit.

[0003] As the degree of electrification of vehicles increases, the types and quantities of loads required are also increasing. The vehicle electrical system is more likely to generate large currents, causing fuses to blow. However, replacing fuses is a complex operation, generally requiring professionals to open the hood to replace them, and sometimes even requiring the replacement of part of the electrical wiring harness, which is time-consuming and labor-intensive, and there is a risk of high-voltage contact, and the overall cost is relatively high. Utility Model Content

[0004] The present application provides a vehicle-mounted power supply device, a power assembly and a vehicle.

[0005] In the first aspect, the present application provides a vehicle-mounted power supply device, which includes a control module, a DC bus and multiple DC branches. The DC bus is used to receive power from the vehicle-mounted power supply and to supply power to multiple loads through multiple DC branches respectively, each DC branch includes a branch power switch tube, and each branch power switch tube is used to turn on or off a DC branch. The control module is used to set the current thresholds of multiple DC branches respectively, and each current threshold is used to indicate the maximum current of a DC branch. The control module is also used to control the power switch tube of a DC branch to be turned on in response to a self-test pass signal of a DC branch and the start of a load connected to a DC branch, and the self-test pass signal is used to indicate that the branch power switch tube of a DC branch and the load connected to the branch power switch tube have no faults. The control module is also used to control the power switch tube of a DC branch to be disconnected in response to the current of a DC branch being greater than or equal to the current threshold of a DC branch.

[0006] Correspondingly, the vehicle power supply device provided in the first aspect uses a power switch tube as a switch for turning on and off the electrical system circuit, and at the same time configures a control module to control the conduction and disconnection of the power switch tube, which can reduce the maintenance work of the electrical system circuit, reduce the cost of use and the risk of high-voltage contact.

[0007] In the vehicle power supply device provided by the first aspect, the control module is also used to respond to the current of a DC branch being greater than or equal to a current threshold of a DC branch. In addition to controlling the power switch tube of a DC branch to disconnect, the control module is also used to control the power switch tubes of other DC branches to disconnect.

[0008] Correspondingly, the control module used by the vehicle power supply device provided in the first aspect can control the on and off of multiple associated DC branch power switch tubes according to the current value of a DC branch, so as to protect the related loads more safely.

[0009] The vehicle-mounted power supply device provided in the first aspect is also used to control a branch power switch tube of a DC branch to remain turned on after controlling the power switch tube of a DC branch to be turned on, when the current of a DC branch is less than a current threshold of a DC branch, the control module is also used to control the branch power switch tube of a DC branch to remain turned on.

[0010] Correspondingly, the control module used in the vehicle power supply device provided in the first aspect can monitor and maintain the conduction state of the power switch tube of a DC branch according to the current value of a DC branch after the power switch tube of the DC branch is turned on, which is more efficient and safer.

[0011] The vehicle-mounted power supply device provided in the first aspect is also used for, after controlling the power switch tube of a DC branch to be disconnected, the control module is also used for obtaining a self-test failure signal or a self-test pass signal of a DC branch. The control module is also used to control the power switch tube of a DC branch to be turned on again in response to the self-test pass signal. The control module is also used to control the power switch tube of a DC branch to remain disconnected in response to the self-test failure signal, and the self-test failure signal is used to indicate that there is a fault in the branch power switch tube of a DC branch and the load connected to the branch power switch tube.

[0012] Correspondingly, after the power switch tube of a DC branch is disconnected, the control module used by the on-board power supply device provided in the first aspect can be used to control the power switch tube of a DC branch to be turned on again according to a self-test pass signal of a DC branch, and can also be used to control the power switch tube of a DC branch to remain disconnected according to a self-test failure signal of a DC branch, thereby realizing the reuse of power switch tubes to protect electrical system circuits and reducing the maintenance work and cost of electrical system circuits.

[0013] In an implementation form of the first aspect, a DC branch of the on-board power supply device also includes a branch fuse, one end of the branch fuse is used to connect to the input end of a branch power switch tube of a DC branch, the other end of the branch fuse is used to connect to the positive pole connection of the DC bus through a DC branch, the fusing current of a branch fuse is greater than the current threshold of a DC branch, and a branch fuse is blown when the fusing current of a branch fuse passes through.

[0014] In one implementation form, the DC branch of the on-board power supply device is equipped with a branch fuse. After the branch fuse blows, the branch power switch tube and the load connected to it can be safely protected. At the same time, the branch power switch tube and the load connected to it can also be checked more safely to prevent leakage in the DC branch circuit.

[0015] In another implementation form of the first aspect, the DC bus of the vehicle power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect to the positive pole connection of the DC bus, the other end of the main circuit fuse is used to connect to the positive pole output of the vehicle power supply, the fusing current of the main circuit fuse is greater than the sum of the current thresholds of multiple DC branches, and the main circuit fuse is blown when the fusing current of the main circuit fuse passes through.

[0016] In another implementation form, the DC bus of the on-board power supply device is equipped with a main circuit fuse. After the main circuit fuse blows, it can safely protect all DC branch power switches and all loads. At the same time, it can also more safely check all DC branch power switches and all loads to prevent leakage in the DC bus circuit.

[0017] In another implementation form of the first aspect, the vehicle power supply device also includes a main power switch tube, an output end of a main power switch tube is used to electrically connect to the positive pole connection of the DC bus, an input end of a main power switch tube is used to electrically connect to the positive pole output of the vehicle power supply, a control end of a main power switch tube is used to signal connect to a control module, a main power switch tube is used to remain on or off after receiving a control signal from the control module, and the control module is used to set a current threshold of the DC bus, and the current threshold of the DC bus is greater than or equal to the sum of the current thresholds of the multiple DC branches.

[0018] In another implementation form, the DC bus of the on-board power supply device is equipped with a main power switch tube, and the control module can also be used to set the current threshold of the DC bus. The current threshold of the DC bus will be adjusted according to the number of DC branches, making the circuit protection of the electrical system more flexible and reducing maintenance costs.

[0019] In another implementation form of the first aspect, the control module of the vehicle power supply device is also used to control a main power switch tube to be turned on in response to a DC bus self-test pass signal and the start-up of multiple loads connected to multiple DC branches, and the self-test pass signal is used to indicate that the vehicle power supply device has no faults. When the current of the DC bus is less than the current threshold of the DC bus, the control module is also used to control a main power switch tube to remain turned on. The control module is also used to control a main power switch tube to be turned off in response to the current of the DC bus being greater than or equal to the current threshold of the DC bus.

[0020] In another implementation form of the first aspect, the control module of the vehicle power supply device is further used to obtain a self-test failure signal or a self-test pass signal of a main power switch tube after a main power switch tube of the DC bus is disconnected. The control module is also used to respond to a self-test pass signal of a main power switch tube, and the control module controls a main power switch tube to be turned on again. The control module is also used to respond to a self-test failure signal of a main power switch tube, and the control module controls a main power switch tube to remain disconnected, and the self-test failure signal is used to indicate that a main power switch tube of the DC bus has a fault.

[0021] In another implementation form, the control module of the on-board power supply device can control the on and off of a main power switch tube at each stage according to the current threshold of the DC bus, which can more comprehensively protect the entire electrical system circuit.

[0022] In another implementation form of the first aspect, the vehicle power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect to the input end of a main circuit power switch tube, the other end of the main circuit fuse is used to connect to the positive output of the vehicle power supply, the output end of the main circuit power switch tube is used to connect to the positive connection of the DC bus, the fusing current of a main circuit fuse is greater than the current threshold of the DC bus, and the main circuit fuse is blown when the fusing current of the main circuit fuse passes through.

[0023] In another implementation form, a main circuit fuse of the vehicle power supply device is used to connect between the positive output of the vehicle power supply and a main circuit power switch tube. The fuse blows when the fuse current passes through it, which can protect the main circuit power tube and the electrical system circuit connected to the main circuit power tube. At the same time, it can also more safely check the main circuit power switch tube, DC bus, DC branch and all loads to prevent circuit leakage.

[0024] In another implementation form of the first aspect, the control module of the vehicle power supply device is also used to reduce the current threshold of the DC bus in response to at least one of an increase in the total usage time of multiple loads, an increase in the outside temperature when the vehicle is in use, or an increase in the number of working loads of multiple loads at the same time.

[0025] In another implementation form, the control module of the on-board power supply device can reduce the current threshold of the DC bus according to some specific conditions when the vehicle is in use, so that the DC bus circuit is safer when the vehicle is in use.

[0026] In another implementation form of the first aspect, the control module of the vehicle-mounted power supply device is used to reduce the current threshold of a DC branch in response to an increase in the operating time of a load connected to a DC branch. The control module is also used to reduce the current threshold of at least one DC branch in response to an increase in the temperature outside the vehicle when the vehicle is in use. The control module is also used to reduce the current threshold of at least one DC branch in response to an increase in the number of loads working at the same time among multiple loads.

[0027] In another implementation form, the control module of the vehicle-mounted power supply device can also reduce the current threshold of the DC branch according to some specific conditions when the vehicle is in use, so that the DC branch circuit is safer when the vehicle is in use.

[0028] In a second aspect, the present application provides a powertrain, which includes a drive motor and the vehicle-mounted power supply device of the first aspect. The vehicle-mounted power supply device of the first aspect also includes an inverter circuit, which is used to convert the DC power provided by the DC bus into three-phase AC power. The inverter circuit includes a three-phase bridge arm, and the two ends of each phase bridge arm are used to receive power from the DC bus through a DC branch, and the midpoint of the three-phase bridge arm is used to output three-phase AC power to control the torque or speed of the drive motor.

[0029] The powertrain provided in the second aspect integrates the inverter circuit into the vehicle power supply device, reducing the circuit volume and saving costs. At the same time, the control module can control the conduction and disconnection of the DC branch power switch tube connected to each phase bridge arm, making it safer for each bridge arm to receive power from the DC bus.

[0030] In one implementation form of the second aspect, when a circuit breaker fault occurs in any phase of the three-phase bridge arm, the control module is used to reduce the current threshold of the DC branch connected to the other two-phase bridge arms, the inverter circuit is used to convert the DC power provided by the DC bus into two-phase AC power, and the midpoint of the other two-phase bridge arm is used to output two-phase AC power to control the torque or speed of the drive motor.

[0031] In an implementation form of the second aspect, when a circuit breaker fault occurs in any phase of the three-phase bridge arm, the control module can also reduce the relevant current threshold to ensure that the drive motor is safer when running in a phase-missing manner.

[0032] In a third aspect, the present application provides a vehicle, comprising a high-voltage power battery, a load, and the on-board power supply device of the first aspect, the on-board power supply device being used to transmit power from the high-voltage power battery to the load via a DC bus.

[0033] The vehicle provided in the third aspect adopts the on-board power supply device of the first aspect, so that the electrical system circuits and loads connected to the high-voltage power battery have safer protection, while reducing costs and the risk of high-voltage contact.

[0034] In an implementation form of the third aspect, when the current of the DC bus is greater than or equal to the current threshold of the DC bus, the control module of the vehicle power supply device is also used to control the high-voltage power battery to disconnect the connection between the high-voltage power battery and the DC bus.

[0035] In an implementation form of the third aspect, the control module of the on-board power supply device can send a signal to the battery management system of the high-voltage power battery so as to disconnect the connection between the high-voltage power battery and the DC bus in time to protect the high-voltage power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of a vehicle provided in an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of a vehicle powertrain provided in an embodiment of the present application;

[0038] Figure 3 This is a circuit diagram of a vehicle-mounted power supply device provided in an embodiment of the present application;

[0039] Figure 4 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0040] Figure 5 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0041] Figure 6 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0042] Figure 7 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0043] Figure 8 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0044] Fig. 9 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0045] Fig.10 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0046] Fig.11 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0047] Fig.12 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0048] Fig.13It is a circuit diagram of a powertrain provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] This section will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. It should be noted that the embodiments described in this section are only part of the embodiments of the present application, not all of the embodiments.

[0050] In the embodiment of the present application, there may be multiple DC branches (501, 502, 503...50X), and the multiple DC branches (501, 502, 503...50X) in the embodiment of the present application have corresponding loads (L1, L2, L3...Ln) and corresponding branch power switches (K1, K2, K3...Kn). For ease of explanation, this article only uses three DC branches to explain the content of the present application.

[0051] An embodiment of the present application provides a vehicle, which includes a high-voltage power battery, a load, and an on-board power supply device, wherein the on-board power supply device is used to transmit power from the high-voltage power battery to the load via a DC bus.

[0052] In an implementation form of a vehicle provided in an embodiment of the present application, when the current of the DC bus is greater than or equal to the current threshold of the DC bus, the control module of the on-board power supply device is also used to control the high-voltage power battery to disconnect the connection between the high-voltage power battery and the DC bus.

[0053] Figure 1 It is a schematic diagram of a vehicle provided in an embodiment of the present application.

[0054] Figure 1 As shown, the vehicle 110 includes a high-voltage power battery 150, an on-board power supply device 120 and a load 130. The load 130 includes a motor M, a load L1, a load L2, a load L3, etc. Figure 2 Powertrain schematic and Figure 3 The on-board power supply device 120 is a schematic diagram of a circuit. The on-board power supply device 120 also includes a DC bus 301 and a control module 200. The on-board power supply device 120 is used to transmit the power supply of the high-voltage power battery 150 to the load 130 through the DC bus 301. The on-board power supply device 120 enables the electrical system circuit and the load 130 connected to the high-voltage power battery 150 to have safer protection, while reducing costs and reducing the risk of high-voltage contact.

[0055] When the current of the DC bus 301 is greater than or equal to the current threshold of the DC bus 301 set by the control module 200, the control module 200 of the on-board power supply device 120 controls the high-voltage power battery 150 to disconnect the high-voltage power battery 150 from the DC bus 301. The control module 200 of the on-board power supply device 120 can send a signal to the battery management system of the high-voltage power battery 150 so as to disconnect the high-voltage power battery 150 from the DC bus 301 in time to protect the high-voltage power battery 150.

[0056] The vehicle provided in the embodiment of the present application also includes a powertrain, which includes a drive motor and an on-board power supply device, and the on-board power supply device is used to convert high-voltage direct current into three-phase alternating current and output three-phase alternating current to control the torque or speed of the drive motor.

[0057] Figure 2 1 is a schematic diagram of a powertrain of a vehicle provided in an embodiment of the present application. The powertrain 160 of a vehicle provided in an embodiment of the present application includes an on-board power supply device 120 and a drive motor M, and the drive motor M is connected to a tire 170. The on-board power supply device 120 includes a circuit 1202.

[0058] In one embodiment provided by the present application, the vehicle-mounted power supply device includes a control module, a DC bus and a plurality of DC branches. The DC bus is used to receive power from the vehicle-mounted power supply and to supply power to a plurality of loads respectively through a plurality of DC branches, each DC branch includes a branch power switch tube, and each branch power switch tube is used to turn on or off a DC branch. The control module is used to set the current thresholds of the plurality of DC branches respectively, and each current threshold is used to indicate the maximum current of a DC branch. The control module is started in response to a self-test pass signal of a DC branch and a load connected to a DC branch, and the control module is also used to control the power switch tube of a DC branch to be turned on, and the self-test pass signal is used to indicate that the branch power switch tube of a DC branch and the load connected to the branch power switch tube have no faults. The control module is responsive to the current of a DC branch being greater than or equal to the current threshold of a DC branch, and the control module is also used to control the power switch tube of a DC branch to be disconnected.

[0059] In an embodiment provided in the present application, the control module of the vehicle power supply device is also used to respond to the current of a DC branch being greater than or equal to a current threshold of a DC branch. In addition to controlling the disconnection of the power switch tube of a DC branch, the control module is also used to control the disconnection of the power switch tubes of other DC branches.

[0060] In one embodiment of the present application, the control module of the vehicle power supply device is also used to control the branch power switch tube of a DC branch to remain turned on after controlling the power switch tube of a DC branch to be turned on, when the current of a DC branch is less than the current threshold of a DC branch. The control module is also used to control the branch power switch tube of a DC branch to remain turned on.

[0061] In one embodiment of the present application, the vehicle-mounted power supply device is further used to control the power switch tube of a DC branch to be disconnected, and the control module is also used to obtain a self-test failure signal or a self-test pass signal of a DC branch. The control module is also used to control the power switch tube of a DC branch to be turned on again in response to the self-test pass signal. The control module is also used to control the power switch tube of a DC branch to remain disconnected in response to the self-test failure signal, and the self-test failure signal is used to indicate that there is a fault in the branch power switch tube of a DC branch and the load connected to the branch power switch tube.

[0062] Figure 3 It is a circuit diagram of a vehicle-mounted power supply device provided in an embodiment of the present application.

[0063] In one embodiment of the present application, the vehicle-mounted power supply device 120 includes a control module 200, a DC bus 301 and a plurality of DC branches (501, 502, 503). The DC bus 301 is used to receive power from the vehicle-mounted power supply and to supply power to a plurality of loads (L1, L2, L3) through a plurality of DC branches (501, 502, 503).

[0064] Figure 3 As shown, the DC bus 301 includes a DC bus positive electrode connection 301+ and a DC bus negative electrode connection 301 −.

[0065] Figure 3 As shown, multiple DC branches (501, 502, 503) include DC branch 501, DC branch 502 and DC branch 503. Among them, DC branch 501 includes DC branch positive electrode connection 501+ and DC branch negative electrode connection 501-. DC branch 502 includes DC branch positive electrode connection 502+ and DC branch negative electrode connection 502-. DC branch 503 includes DC branch positive electrode connection 503+ and DC branch negative electrode connection 503-.

[0066] Figure 3As shown, the DC branch positive electrode connection 501+ and the DC branch negative electrode connection 501- are respectively connected to the DC bus positive electrode connection 301+ and the DC bus negative electrode connection 301-, and the DC branch positive electrode connection 501+ and the DC branch negative electrode connection 501- are respectively connected to the positive electrode and negative electrode of the load L1. The DC branch positive electrode connection 502+ and the DC branch negative electrode connection 502- are respectively connected to the DC bus positive electrode connection 301+ and the DC bus negative electrode connection 301-, and the DC branch positive electrode connection 502+ and the DC branch negative electrode connection 502- are respectively connected to the positive electrode and negative electrode of the load L2. The DC branch positive electrode connection 503+ and the DC branch negative electrode connection 503- are respectively connected to the DC bus positive electrode connection 301+ and the DC bus negative electrode connection 301-, and the DC branch positive electrode connection 503+ and the DC branch negative electrode connection 503- are respectively connected to the positive electrode and negative electrode of the load L3.

[0067] In one embodiment of the present application, each DC branch (501, 502, 503) includes a branch power switch tube (K1, K2, K3). Each branch power switch tube (K1, K2, K3) is used to turn on or off a DC branch (501, 502, 503).

[0068] Figure 4 As shown, the branch power switch tube K1 is used to turn on or off the DC branch 501. The branch power switch tube K2 is used to turn on or off the DC branch 502. The branch power switch tube K3 is used to turn on or off the DC branch 503.

[0069] In one embodiment of the present application, the control module 200 is used to respectively set current thresholds of multiple DC branches (501, 502, 503), and each current threshold is used to indicate the maximum current value of a DC branch (501, 502, 503).

[0070] Figure 3 As shown, the control module 200 is used to set the current threshold of the DC branch 501, and the current threshold of 501 is used to indicate the maximum current of the DC branch 501. The control module 200 is used to set the current threshold of the DC branch 502, and the current threshold of 502 is used to indicate the maximum current of the DC branch 502. The control module 200 is used to set the current threshold of the DC branch 503, and the current threshold of 503 is used to indicate the maximum current of the DC branch 503.

[0071] In one embodiment of the present application, the control module 200 is also used to control the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to be turned on in response to a self-test pass signal of a DC branch (501, 502, 503) and the start of a load (L1, L2, L3) connected to the DC branch (501, 502, 503), and the self-test pass signal is used to indicate that there is no fault in the branch power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) and the load (L1, L2, L3) connected to the branch power switch tube (K1, K2, K3).

[0072] Figure 3 As shown, the control module 200 is also used to control the power switch tube K1 of a DC branch 501 to be turned on in response to the self-test pass signal of the DC branch 501 and the start of the load L1 connected to the DC branch 501, and the self-test pass signal is used to indicate that the branch power switch tube K1 of the DC branch 501 and the load L1 connected to the branch power switch tube K1 have no faults. The control module 200 is also used to control the power switch tube K2 of a DC branch 502 to be turned on in response to the self-test pass signal of the DC branch 502 and the start of the load L2 connected to the DC branch 502, and the self-test pass signal is used to indicate that the branch power switch tube K2 of the DC branch 502 and the load L2 connected to the branch power switch tube K2 have no faults. The control module 200 is also used to control the conduction of a power switch tube K3 of a DC branch 503 in response to the self-test pass signal of the DC branch 503 and the start-up of the load L3 connected to the DC branch 503. The self-test pass signal is used to indicate that there are no faults in the branch power switch tube K3 of the DC branch 503 and the load L3 connected to the branch power switch tube K3.

[0073] In one embodiment of the present application, the control module 200 is also used to control the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to disconnect in response to the current of a DC branch (501, 502, 503) being greater than or equal to the current threshold of a DC branch (501, 502, 503).

[0074] Figure 3 As shown, the control module 200 is further used to control the power switch tube K1 of a DC branch 501 to be disconnected in response to the current of the DC branch 501 being greater than or equal to the current threshold of the DC branch 501. The control module 200 is further used to control the power switch tube K2 of a DC branch 502 to be disconnected in response to the current of the DC branch 502 being greater than or equal to the current threshold of the DC branch 502. The control module 200 is further used to control the power switch tube K3 of a DC branch 503 to be disconnected in response to the current of the DC branch 503 being greater than or equal to the current threshold of the DC branch 503.

[0075] In one embodiment of the present application, the vehicle power supply device 120 uses power switch tubes (K1, K2, K3) as switches for turning on and off the electrical system circuit, and at the same time configures a control module 200 to control the conduction and disconnection of the power switch tubes (K1, K2, K3), which can reduce the maintenance work of the electrical system circuit, reduce the cost of use and the risk of high-voltage contact.

[0076] In one embodiment of the present application, the control module 200 of the vehicle power supply device 120 can also be used to respond to the current of a DC branch (501, 502, 503) being greater than or equal to the current threshold of a DC branch (501, 502, 503). In addition to controlling the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to be disconnected, the control module 200 is also used to control the power switch tube (K1, K2, K3) of other DC branches (501, 502, 503) to be disconnected.

[0077] Figure 3 As shown, the control module 200 can also be used to respond to the current of the DC branch 501 being greater than or equal to the current threshold of the DC branch 501. In addition to controlling the power switch tube K1 of the DC branch 501 to be disconnected, the control module 200 is also used to control the power switch tube K2 or K3 of other DC branches 502 or 503 to be disconnected. The control module 200 can also be used to respond to the current of the DC branch 502 being greater than or equal to the current threshold of the DC branch 502. In addition to controlling the power switch tube K2 of the DC branch 502 to be disconnected, the control module 200 is also used to control the power switch tube K1 or K3 of other DC branches 501 or 503 to be disconnected. The control module 200 can also be used to respond to the current of the DC branch 503 being greater than or equal to the current threshold of the DC branch 503. In addition to controlling the power switch tube K3 of the DC branch 503 to disconnect, the control module 200 is also used to control the power switch tube K2 or K1 of other DC branches 502 or 501 to disconnect.

[0078] Correspondingly, in one embodiment of the present application, the control module 200 used by the vehicle power supply device 120 can control the conduction and disconnection of multiple associated DC branch power switch tubes (K1, K2, K3) according to the current value of a DC branch (501, 502, 503), so as to more safely protect the related loads (L1, L2, L3).

[0079] In one embodiment of the present application, the control module 200 of the vehicle power supply device 120 is also used to control the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to be turned on. When the current of a DC branch (501, 502, 503) is less than the current threshold of a DC branch (501, 502, 503), the control module 200 is also used to control the branch power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to remain turned on.

[0080] Figure 3 As shown, the control module 200 is further used to control the branch power switch tube K1 of a DC branch 501 to remain on after the power switch tube K1 of the DC branch 501 is turned on, when the current of the DC branch 501 is less than the current threshold of the DC branch 501. The control module 200 is further used to control the branch power switch tube K2 of a DC branch 502 to remain on after the power switch tube K2 of the DC branch 502 is turned on, when the current of the DC branch 502 is less than the current threshold of the DC branch 502. The control module 200 is further used to control the branch power switch tube K3 of a DC branch 503 to remain on after the power switch tube K3 of the DC branch 503 is turned on, when the current of the DC branch 503 is less than the current threshold of the DC branch 503.

[0081] Correspondingly, the control module 200 used in the vehicle power supply device 120 in an embodiment of the present application can monitor and maintain the conduction state of the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) according to the current value of a DC branch (501, 502, 503) after the power switch tube (K1, K2, K3) of the DC branch (501, 502, 503) is turned on, which is more efficient and safer.

[0082] In one embodiment of the present application, the control module 200 of the vehicle power supply device 120 is also used to control the power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to be disconnected, and the control module 200 is also used to obtain a self-test failure signal or a self-test pass signal of a DC branch (501, 502, 503). The control module 200 is also used to control the power switch tube of a DC branch (501, 502, 503) to be turned on again in response to the self-test pass signal. The control module is also used to control the power switch tube of a DC branch (501, 502, 503) to remain disconnected in response to the self-test failure signal, and the self-test failure signal is used to indicate that there is a fault in the branch power switch tube of a DC branch (501, 502, 503) and the load connected to the branch power switch tube.

[0083] Figure 3 As shown, the control module 200 is also used to obtain a self-test failure signal or a self-test pass signal of a DC branch 501 after controlling the power switch tube K1 of a DC branch 501 to be disconnected. The control module 200 is also used to control the power switch tube K1 of a DC branch 501 to be turned on again in response to the self-test pass signal of a DC branch 501. The control module 200 is also used to control the power switch tube K1 of a DC branch 501 to remain disconnected in response to the self-test failure signal of a DC branch 501. The self-test failure signal of a DC branch 501 is used to indicate that there is a fault in the branch power switch tube K1 of a DC branch 501 and the load L1 connected to the branch power switch tube K1. After the control module 200 controls the power switch tube K2 of a DC branch 502 to be disconnected, the control module 200 is also used to obtain a self-test failure signal or a self-test pass signal of a DC branch 502. The control module 200 responds to a self-test pass signal of a DC branch 502, and the control module 200 is also used to control the power switch tube K2 of a DC branch 502 to be turned on again. The control module 200 responds to a self-test failure signal of a DC branch 502, and the control module 200 is also used to control the power switch tube K2 of a DC branch 502 to remain turned off. The self-test failure signal of a DC branch 502 is used to indicate that there is a fault in the branch power switch tube K2 of a DC branch 502 and the load L2 connected to the branch power switch tube K2. After the control module 200 controls the power switch tube K3 of a DC branch 503 to be turned off, the control module 200 is also used to obtain a self-test failure signal or a self-test pass signal of a DC branch 503. The control module 200 responds to a self-test pass signal of a DC branch 503, and the control module 200 is also used to control the power switch tube K3 of a DC branch 503 to be turned on again. The control module 200 responds to a self-test failure signal of a DC branch 503. The control module 200 is also used to control a power switch tube K3 of a DC branch 503 to remain disconnected. The self-test failure signal of a DC branch 503 is used to indicate that there is a fault in a branch power switch tube K3 of a DC branch 503 and a load L3 connected to the branch power switch tube K3.

[0084] Accordingly, in one embodiment of the present application, the control module 200 can be used to control a power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to be turned on again according to a self-test pass signal of a DC branch (501, 502, 503), and can also be used to control a power switch tube (K1, K2, K3) of a DC branch (501, 502, 503) to remain disconnected according to a self-test failure signal of a DC branch (501, 502, 503), thereby realizing the reuse of power switch tubes (K1, K2, K3) to protect the electrical system circuit and reduce the maintenance work and cost of the electrical system circuit.

[0085] In another embodiment of the present application, a DC branch of a vehicle power supply device also includes a branch fuse, one end of a branch fuse is used to connect to a branch power switch tube input end of a DC branch, the other end of a branch fuse is used to connect to the positive pole connection of the DC bus through a DC branch, the fusing current of a branch fuse is greater than the current threshold of a DC branch, and a branch fuse is blown when the fusing current of a branch fuse passes through.

[0086] Figure 4 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0087] In another embodiment of the present application, a DC branch (501, 502, 503) of the on-board power supply device 120 also includes a branch fuse (R1, R2, R3), one end of a branch fuse (R1, R2, R3) is used to connect to the input end of a branch power switch tube (K1, K2, K3) of a DC branch (501, 502, 503), the other end of a branch fuse (R1, R2, R3) is used to connect to the positive pole connection 301+ of the DC bus 301 through a DC branch (501, 502, 503), the fusing current of a branch fuse (R1, R2, R3) is greater than the current threshold of a DC branch (501, 502, 503), and a branch fuse (R1, R2, R3) is blown when the fusing current of a branch fuse (R1, R2, R3) passes through.

[0088] The fuse provided in the present application is mainly composed of a fuse element, a fuse tube and a fuse seat. The fuse type is determined according to its rated voltage and rated current. When selecting a fuse, it is necessary to select the corresponding specification model according to the actual circuit load.

[0089] Figure 4As shown, a DC branch 501 of the on-board power supply device 120 also includes a branch fuse R1, one end of the branch fuse R1 is used to connect to the input end of the branch power switch tube K1 of a DC branch 501, and the other end of the branch fuse R1 is used to connect to the positive connection 301+ of the DC bus 301 through a DC branch 501, and the fusing current of the branch fuse R1 is greater than the current threshold of the DC branch 501, and the branch fuse R1 is blown when the fusing current of the branch fuse R1 passes through. A DC branch 502 of the on-board power supply device 120 also includes a branch fuse R2, one end of which is used to connect to an input end of a branch power switch tube K2 of a DC branch 502, and the other end of which is used to connect to a positive connection 301+ of a DC bus 301 through a DC branch 502. The fusing current of a branch fuse R2 is greater than a current threshold of a DC branch 502, and a branch fuse R2 is blown when the fusing current of a branch fuse R2 passes through. A DC branch 503 of the on-board power supply device 120 also includes a branch fuse R3, one end of which is used to connect to an input end of a branch power switch tube K3 of a DC branch 503, and the other end of which is used to connect to a positive connection 301+ of a DC bus 301 through a DC branch 503. The fusing current of a branch fuse R3 is greater than a current threshold of a DC branch 503, and a branch fuse R3 is blown when the fusing current of a branch fuse R3 passes through.

[0090] Correspondingly, in another embodiment, the DC branch (501, 502, 503) of the vehicle power supply device 120 is configured with a branch fuse (R1, R2, R3). After the branch fuse (R1, R2, R3) is blown, the branch power switch tube (K1, K2, K3) and the load (L1, L2, L3) connected thereto can be safely protected. At the same time, the branch power switch tube (K1, K2, K3) and the load (L1, L2, L3) connected thereto can also be checked more safely to prevent leakage in the DC branch (501, 502, 503) circuit.

[0091] In another embodiment of the present application, the DC bus of the vehicle power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect to the positive pole connection of the DC bus, and the other end of the main circuit fuse is used to connect to the positive pole output of the vehicle power supply. The fusing current of a main circuit fuse is greater than the sum of the current thresholds of multiple DC branches, and a main circuit fuse is blown when the fusing current of a main circuit fuse passes through.

[0092] Figure 5 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0093] Figure 5 As shown, the DC bus 301 of the vehicle power supply device 120 also includes a main circuit fuse R0, one end of the main circuit fuse R0 is used to connect the positive pole connection 301+ of the DC bus 301, and the other end of the main circuit fuse R0 is used to connect the positive pole output Uh of the vehicle power supply. The fusing current of the main circuit fuse R0 is greater than the sum of the current thresholds of the DC branch 501, the DC branch 502, and the DC branch 503. The main circuit fuse R0 is blown when the fusing current of the main circuit fuse R0 passes through.

[0094] Correspondingly, in another embodiment, the DC bus 301 of the on-board power supply device 120 is configured with a main circuit fuse R0. After the main circuit fuse R0 is blown, all DC branch (501, 502, 503) power switch tubes (K1, K2, K3) and all loads (L1, L2, L3) can be safely protected. At the same time, all DC branch power switch tubes (K1, K2, K3) and all loads (L1, L2, L3) can also be checked more safely to prevent leakage in the DC bus 301 circuit.

[0095] In another embodiment of the present application, the vehicle power supply device also includes a main power switch tube, an output end of a main power switch tube is used to electrically connect to the positive pole connection of the DC bus, an input end of a main power switch tube is used to electrically connect to the positive pole output of the vehicle power supply, a control end of a main power switch tube is used to signal connect to a control module, a main power switch tube is used to remain on or off after receiving a control signal from the control module, and the control module is used to set a current threshold of the DC bus, and the current threshold of the DC bus is greater than or equal to the sum of the current thresholds of the multiple DC branches.

[0096] Figure 6 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application. Figure 7 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application. Figure 8 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0097] Figure 6 and Figure 7As shown, the vehicle power supply device 120 also includes a main power switch tube K0, an output end of the main power switch tube K0 is used to electrically connect the positive wiring 301+ of the DC bus 301, an input end of the main power switch tube K0 is used to electrically connect the positive output Uh of the vehicle power supply, a control end of the main power switch tube K0 is used for signal connection control module 200, and a main power switch tube K0 is used to remain on or off after receiving the control signal of the control module 200. The control module 200 is used to set the current threshold of the DC bus 301, and the current threshold of the DC bus 301 is greater than or equal to the sum of the current thresholds of the DC branch 501, the DC branch 502, and the DC branch 503.

[0098] Figure 8 As shown, the vehicle power supply device 120 also includes a main power switch tube K0, an output end of the main power switch tube K0 is used to electrically connect the positive wiring 301+ of the DC bus 301, an input end of the main power switch tube K0 is used to electrically connect a main fuse R0, R0 is used to electrically connect the positive output Uh of the vehicle power supply, a control end of the main power switch tube K0 is used for signal connection control module 200, a main power switch tube K0 is used to remain on or off after receiving the control signal of the control module 200, and the control module 200 is used to set the current threshold of the DC bus 301, and the current threshold of the DC bus 301 is greater than or equal to the sum of the current thresholds of the DC branch 501, the DC branch 502, and the DC branch 503.

[0099] Correspondingly, in another embodiment, the DC bus 301 of the vehicle power supply device 120 is configured with a main power switch tube K0, and the control module 200 can also be used to set the current threshold of the DC bus 301. The current threshold of the DC bus 301 will be adjusted according to the number of DC branches 501, DC branches 502, and DC branches 503, so that the circuit protection of the electrical system is more flexible and the maintenance cost is reduced.

[0100] In another embodiment of the present application, the control module of the vehicle power supply device is also used to control a main power switch tube to be turned on in response to a DC bus self-test pass signal and the start-up of multiple loads connected to multiple DC branches, and the self-test pass signal is used to indicate that the vehicle power supply device has no faults. When the current of the DC bus is less than the current threshold of the DC bus, the control module is also used to control a main power switch tube to remain turned on. The control module is also used to control a main power switch tube to be turned off in response to the current of the DC bus being greater than or equal to the current threshold of the DC bus.

[0101] In another embodiment of the present application, the control module of the vehicle power supply device is also used to obtain a self-test failure signal or a self-test pass signal of a main power switch tube after a main power switch tube of the DC bus is disconnected. The control module is also used to respond to a self-test pass signal of a main power switch tube, and the control module controls a main power switch tube to be turned on again. The control module is also used to respond to a self-test failure signal of a main power switch tube, and the control module controls a main power switch tube to remain disconnected, and the self-test failure signal is used to indicate that a main power switch tube of the DC bus has a fault.

[0102] Figure 6 , Figure 7 , Figure 8 As shown, the control module 200 of the on-board power supply device 120 responds to the self-test pass signal of the DC bus 301 and the start of the loads L1, L2, and L3 connected to the DC branches 501, 502, and 503, respectively. The control module 200 is also used to control a main power switch K0 to be turned on, and the self-test pass signal is used to indicate that there is no fault in the on-board power supply device 120. When the current of the DC bus 301 is less than the current threshold of the DC bus 301, the control module 200 is also used to control a main power switch K0 to remain turned on. The control module 200 is also used to control a main power switch K0 to be turned off in response to the current of the DC bus 301 being greater than or equal to the current threshold of the DC bus 301.

[0103] Figure 6 , Figure 7 , Figure 8 As shown, after a main power switch tube K0 of the DC bus 301 is disconnected, the control module 200 of the vehicle power supply device 120 is also used to obtain a self-test failure signal or the self-test pass signal of a main power switch tube K0. In response to the self-test pass signal of a main power switch tube K0, the control module 200 is also used to control a main power switch tube K0 to be turned on again. In response to the self-test failure signal of a main power switch tube K0, the control module 200 is also used to control a main power switch tube K0 to remain disconnected, and the self-test failure signal is used to indicate that a main power switch tube K0 of the DC bus 301 has a fault.

[0104] Correspondingly, in another embodiment, the control module 200 of the vehicle power supply device 120 can control the on and off of a main power switch tube K0 at each stage according to the current threshold of the DC bus 301, so as to more comprehensively protect the entire electrical system circuit.

[0105] In another embodiment of the present application, the vehicle power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect to the input end of a main circuit power switch tube, the other end of the main circuit fuse is used to connect to the positive output of the vehicle power supply, the output end of a main circuit power switch tube is used to connect to the positive connection of the DC bus, the fusing current of a main circuit fuse is greater than the current threshold of the DC bus, and the main circuit fuse is blown when the fusing current of the main circuit fuse passes through.

[0106] Fig. 9 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0107] Figure 8 , Fig. 9 As shown, the vehicle power supply device 120 also includes a main circuit fuse R0, one end of the main circuit fuse R0 is used to connect to the input end of a main circuit power switch tube K0, the other end of the main circuit fuse R0 is used to connect to the positive output Uh of the vehicle power supply, the output end of the main circuit power switch tube K0 is used to connect to the positive connection 301+ of the DC bus 301, the fusing current of the main circuit fuse R0 is greater than the current threshold of the DC bus 301, and the main circuit fuse R0 is melted when the fusing current of the main circuit fuse R0 passes through.

[0108] In another embodiment of the present application, a main circuit fuse R0 of the vehicle power supply device 120 is used to be connected between the positive output Uh of the vehicle power supply and a main circuit power switch tube K0. The fuse R0 melts when the fuse current passes through, which can protect the main circuit power tube K0 and the electrical system circuit of the main circuit power tube connected to K0. At the same time, the main circuit power switch tube K0, the DC bus 301, the DC branch (501, 502, 503) and all loads (L1, L2, L3) can also be checked more safely to prevent circuit leakage.

[0109] In another embodiment of the present application, the control module of the vehicle power supply device is also used to reduce the current threshold of the DC bus in response to at least one of an increase in the total usage time of multiple loads, an increase in the outside temperature when the vehicle is in use, or an increase in the number of working loads of multiple loads at the same time.

[0110] Fig.10 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0111] Fig.10As shown, the control module 200 of the vehicle power supply device 120 can also be used to communicate with the vehicle controller VCU. The vehicle controller VCU can obtain the sum of the used time of the load L1, load L2, and load L3 and transmit the above signal to the control module 200. The control module 200 is also used to respond to the increase in the sum of the used time of the load L1, load L2, and load L3, thereby reducing the current threshold of the DC bus 301. The vehicle controller VCU can also obtain the outside temperature measured by the fault-free temperature sensor on the vehicle when the vehicle 110 is in use and transmit the above signal to the control module 200. The control module 200 is also used to respond to the increase in the outside temperature when the vehicle 110 is in use, thereby reducing the current threshold of the DC bus 301. The vehicle controller VCU can also obtain the number of working loads of the load L1, load L2, and load L3 at the same time and transmit the above signal to the control module 200. The control module 200 is also used to respond to the increase in the number of working loads of the load L1, load L2, and load L3 at the same time, thereby reducing the current threshold of the DC bus 301.

[0112] In another embodiment, the control module 200 of the on-board power supply device 120 can reduce the current threshold of the DC bus 301 according to some specific conditions when the vehicle 110 is in use, so that the DC bus 301 circuit is safer when the vehicle 110 is in use.

[0113] In another embodiment of the present application, the control module of the vehicle-mounted power supply device is used to reduce the current threshold of a DC branch in response to an increase in the operating time of a load connected to a DC branch. The control module is also used to reduce the current threshold of at least one DC branch in response to an increase in the temperature outside the vehicle when the vehicle is in use. The control module is also used to reduce the current threshold of at least one DC branch in response to an increase in the number of loads working at the same time among multiple loads.

[0114] Fig.11 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0115] Fig.10 , Fig.11 As shown, the control module 200 of the vehicle power supply device 120 can also be used to communicate with the vehicle controller VCU. The vehicle controller VCU can obtain the usage time of load L1, load L2, and load L3. The VCU can also obtain the outside temperature measured by the fault-free temperature sensor on the vehicle when the vehicle 110 is in use. The VCU can also obtain the number of working loads of load L1, load L2, and load L3 at the same time. The vehicle controller VCU can be used to transmit the above signal to the control module 200 for use.

[0116] The control module 200 of the vehicle power supply device 120 is used to reduce the current threshold of a DC branch 501 in response to the increase of the operating time of a load L1 connected to a DC branch 501. The control module 200 is also used to reduce the current threshold of a DC branch 502 in response to the increase of the operating time of a load L2 connected to a DC branch 502. The control module 200 is also used to reduce the current threshold of a DC branch 503 in response to the increase of the operating time of a load L3 connected to a DC branch 503.

[0117] The control module 200 is also used to reduce the current threshold of a DC branch 501, a DC branch 502, or a DC branch 503 in response to an increase in the outside temperature measured by a fault-free temperature sensor on the vehicle when the vehicle 110 is in use. The control module 200 is also used to reduce the current threshold of a DC branch 501 and a DC branch 502, or a DC branch 501 and a DC branch 503, or a DC branch 502 and a DC branch 503 in response to an increase in the outside temperature measured by a fault-free temperature sensor on the vehicle when the vehicle 110 is in use. The control module 200 is also used to reduce the current threshold of a DC branch 501, a DC branch 502, and a DC branch 503 in response to an increase in the outside temperature measured by a fault-free temperature sensor on the vehicle when the vehicle 110 is in use.

[0118] The control module 200 is also used to reduce the current threshold of a DC branch 501, a DC branch 502, or a DC branch 503 in response to an increase in the number of loads working at the same time among the loads L1, the loads L2, and the loads L3. The control module 200 is also used to reduce the current threshold of a DC branch 501 and a DC branch 502, or a DC branch 501 and a DC branch 503, or a DC branch 502 and a DC branch 503 in response to an increase in the number of loads working at the same time among the loads L1, the loads L2, and the loads L3. The control module 200 is also used to reduce the current threshold of a DC branch 501, a DC branch 502, and a DC branch 503 in response to an increase in the number of loads working at the same time among the loads L1, the loads L2, and the loads L3.

[0119] In another embodiment of the present application, the control module 200 of the vehicle power supply device 120 can also reduce the current threshold of the DC branch (501, 502, 503) according to some specific conditions when the vehicle 110 is in use, so that the DC branch (501, 502, 503) circuit is safer when the vehicle 110 is in use.

[0120] An embodiment of the present application provides a powertrain, which includes a drive motor and a vehicle-mounted power supply device of the first aspect. The vehicle-mounted power supply device of the first aspect also includes an inverter circuit, which is used to convert direct current provided by a DC bus into three-phase alternating current. The inverter circuit includes a three-phase bridge arm, and the two ends of each phase bridge arm are used to receive power from the DC bus through a DC branch, and the midpoint of the three-phase bridge arm is used to output three-phase alternating current to control the torque or speed of the drive motor.

[0121] In an implementation form of a powertrain provided in an embodiment of the present application, when a circuit breaker fault occurs in any phase of a three-phase bridge arm, a control module is used to reduce the current threshold of a DC branch connected to the other two-phase bridge arms, an inverter circuit is used to convert the DC power provided by the DC bus into two-phase AC power, and the midpoint of the other two-phase bridge arms is used to output two-phase AC power to control the torque or speed of the drive motor.

[0122] Fig.12 It is a schematic diagram of a powertrain provided in an embodiment of the present application. Fig.13 Schematic diagram of the vehicle-mounted power supply device of the powertrain provided in the embodiment of the present application. The powertrain 160 of the present application includes a vehicle-mounted power supply device 120 and a drive motor M, and the drive motor M is connected to the tire 170. The vehicle-mounted power supply device 120 includes an inverter circuit 1201 and a circuit 1202. The vehicle-mounted power supply device 120 reduces the circuit volume and saves costs. Fig.13 In the vehicle-mounted power supply device 120 of the power assembly shown, the three-phase bridge arm of the inverter circuit 1201 serves as load L1, load L2, and load L3. The control module 200 is used to control the conduction and disconnection of the DC branch power switch tubes Ka1, Ka2, and Ka3 respectively connected to the three-phase bridge arm loads L1, load L2, and load L3 of the inverter circuit 1201, so that each bridge arm receives the power supply of the DC bus 301 more safely. When any phase of the three-phase bridge arm loads L1, load L2, and load L3 of the inverter circuit 1201 has a circuit breaker fault, the control module 200 is also used to reduce the DC branch current threshold of the remaining two-phase bridge arm to ensure that the drive motor M is safer when running in the absence of a phase.

[0123] This section introduces the on-board power supply device, powertrain and vehicle provided in the embodiments of the present application, and uses specific examples to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. At the same time, for those of ordinary skill in the art, according to the ideas of the present application, there will be changes in the specific embodiments and scope of application. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A vehicle-mounted power supply device, characterized in that: The vehicle-mounted power supply device includes a control module, a DC bus and a plurality of DC branches, wherein the DC bus is used to receive power from the vehicle-mounted power supply and to supply power to a plurality of loads through the plurality of DC branches respectively, each of the DC branches includes a branch power switch tube, each of the branch power switch tube is used to turn on or off a DC branch, and the control module is used to: respectively setting current thresholds of the plurality of DC branches, each of the current thresholds being used to indicate a maximum current value of one of the DC branches; In response to a self-test pass signal of one of the DC branches and the start-up of the load connected to the one DC branch, controlling the power switch tube of the one DC branch to be turned on, wherein the self-test pass signal is used to indicate that the branch power switch tube of the one DC branch and the load connected to the branch power switch tube have no faults; In response to the current of the one DC branch being greater than or equal to the current threshold of the one DC branch, the power switch tube of the one DC branch is controlled to be disconnected.

2. The vehicle-mounted power supply device according to claim 1, characterized in that: The control module is used to respond to the current of the one DC branch being greater than or equal to the current threshold of the one DC branch. In addition to controlling the power switch tube of the one DC branch to disconnect, the control module is also used to control the power switch tubes of other DC branches to disconnect.

3. The vehicle-mounted power supply device according to claim 1, characterized in that: After controlling the power switch tube of the one DC branch to be turned on, the control module is further used to: When the current of the one DC branch is less than the current threshold of the one DC branch, the branch power switch tube of the one DC branch is controlled to remain turned on.

4. The vehicle-mounted power supply device according to claim 1, characterized in that: After controlling the power switch tube of the one DC branch to be disconnected, the control module is further used for: Obtaining a self-test failure signal or a self-test pass signal of the one DC branch; In response to the self-test pass signal, controlling the power switch tube of the one DC branch to be turned on again; In response to the self-test failure signal, the power switch tube of the one DC branch is controlled to remain disconnected, and the self-test failure signal is used to indicate that there is a fault in the branch power switch tube of the one DC branch and the load connected to the branch power switch tube.

5. The vehicle-mounted power supply device according to claim 1, characterized in that: One of the DC branches of the on-board power supply device also includes a branch fuse, one end of which is used to connect to the input end of the branch power switch tube of the DC branch, and the other end of which is used to connect to the positive pole connection of the DC bus through the DC branch. The fusing current of the branch fuse is greater than the current threshold of the DC branch, and the branch fuse is blown when the fusing current of the branch fuse passes through.

6. The vehicle-mounted power supply device according to claim 1, characterized in that: The DC bus of the vehicle-mounted power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect the positive pole connection of the DC bus, and the other end of the main circuit fuse is used to connect the positive pole output of the vehicle-mounted power supply. The fusing current of the main circuit fuse is greater than the sum of the current thresholds of the multiple DC branches, and the main circuit fuse is blown when the fusing current of the main circuit fuse passes through.

7. The vehicle-mounted power supply device according to any one of claims 1 to 6, characterized in that: The vehicle-mounted power supply device further includes a main power switch tube, the output end of the main power switch tube is used to electrically connect the positive electrode connection of the DC bus, the input end of the main power switch tube is used to electrically connect the positive electrode output of the vehicle-mounted power supply, the control end of the main power switch tube is used to signal connect the control module, the main power switch tube is used to remain on or off after receiving the control signal of the control module, and the control module is used to: A current threshold of the DC bus is set, wherein the current threshold of the DC bus is greater than or equal to the sum of the current thresholds of the multiple DC branches.

8. The vehicle-mounted power supply device according to claim 7, characterized in that: The control module is also used for: In response to the DC bus self-test pass signal and the start-up of the multiple loads connected to the multiple DC branches, controlling the one main power switch tube to be turned on, wherein the self-test pass signal is used to indicate that the on-board power supply device has no fault; When the current of the DC bus is less than the current threshold of the DC bus, controlling the one main power switch tube to remain turned on; In response to the current of the DC bus being greater than or equal to the current threshold of the DC bus, controlling the one main power switch tube to be disconnected; After the one main power switch tube of the DC bus is disconnected, a self-test failure signal or a self-test pass signal of the one main power switch tube is obtained, and in response to the self-test pass signal of the one main power switch tube, the one main power switch tube is controlled to be turned on again; or, in response to the self-test failure signal of the one main power switch tube, the one main power switch tube is controlled to remain disconnected, and the self-test failure signal is used to indicate that there is a fault in the one main power switch tube of the DC bus.

9. The vehicle-mounted power supply device according to claim 7, characterized in that: The vehicle-mounted power supply device also includes a main circuit fuse, one end of the main circuit fuse is used to connect to the input end of the main circuit power switch tube, the other end of the main circuit fuse is used to connect to the positive output of the vehicle-mounted power supply, the output end of the main circuit power switch tube is used to connect to the positive connection of the DC bus, the fusing current of the main circuit fuse is greater than the current threshold of the DC bus, and the main circuit fuse is blown when the fusing current of the main circuit fuse passes through.

10. The vehicle-mounted power supply device according to claim 7, characterized in that: The control module is also used for: In response to at least one of an increase in the total usage time of the multiple loads, an increase in the outside temperature of the vehicle when the vehicle is in use, or an increase in the number of the multiple loads in a working state at the same time, the current threshold of the DC bus is reduced.

11. The vehicle-mounted power supply device according to claim 1 or 10, characterized in that: The control module is used for: In response to an increase in the operating time of the load connected to one of the DC branches, reducing the current threshold of the one DC branch; or, In response to an increase in the outside air temperature of the vehicle when the vehicle is in use, reducing the current threshold of at least one of the DC branches; or, In response to an increase in the number of loads among the multiple loads operating at the same time, the current threshold of at least one of the DC branches is reduced.

12. A powertrain, characterized in that: The powertrain includes a drive motor and the on-board power supply device of any one of claims 1-11, the on-board power supply device also includes an inverter circuit, the inverter circuit is used to convert the DC power provided by the DC bus into three-phase AC power, the inverter circuit includes a three-phase bridge arm, the two ends of each phase of the bridge arm are used to receive power from the DC bus through one of the DC branches, and the midpoint of the three-phase bridge arm is used to output the three-phase AC power to control the torque or speed of the drive motor.

13. The powertrain according to claim 12, characterized in that: When a circuit breaker fault occurs in any phase of the three-phase bridge arm, the control module of the vehicle power supply device is used to reduce the current threshold of the DC branch connected to the other two phases of the three-phase bridge arm, and the inverter circuit is used to convert the DC power provided by the DC bus into two-phase AC power. The midpoint of the bridge arm of the other two phases is used to output the two-phase AC power to control the torque or speed of the drive motor.

14. A vehicle, characterized in that: The vehicle comprises a high-voltage power battery, a load and the on-board power supply device according to any one of claims 1 to 11, wherein the on-board power supply device is used to transmit power from the high-voltage power battery to the load via the DC bus.

15. The vehicle according to claim 14, characterized in that When the current of the DC bus is greater than or equal to the current threshold of the DC bus, the control module of the on-board power supply device is further used to control the high-voltage power battery to disconnect the high-voltage power battery from the DC bus.

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