Vehicle power supply system

Abstract

Provided is a vehicle power supply system capable of stabilizing the voltage of an in-vehicle electrical device. A vehicle power supply system (1) is provided with: a high-voltage battery (2) mounted on a vehicle (100); a first DC / DC converter (3) disposed on the front (X1) side of the vehicle (100) and configured so as to be capable of transforming the DC power supplied from the high-voltage battery (2); a second DC / DC converter (4) disposed on the rear (X2) side in the longitudinal direction (X) and configured so as to be capable of transforming the DC power; a power supply line (10) that connects the first DC / DC converter and the second DC / DC converter and to which the power transformed by the first DC / DC converter and the power transformed by the second DC / DC converter are supplied; and a first power distribution unit (5), a second power distribution unit (6), and a third power distribution unit (7) that connect the power supply line (10) to a plurality of electrical devices (9) mounted on the vehicle, respectively, and distributes the power supplied from the power supply line (10) to the plurality of electrical devices (9).

Description

Technical Field

[0001] This invention relates to a power supply system for vehicles. Background Technology

[0002] For vehicles, there are vehicle power systems that configure two DC / DC converters, two batteries, and two switching relays (for example, see Patent Document 1). In this vehicle power system, when the output voltage supplied from one DC / DC converter is less than a predetermined value, the switching relay is switched on / off, thereby covering the output voltage supplied from the other DC / DC converter and ensuring power supply to the vehicle's electrical equipment.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-29200 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in conventional vehicle power systems with one battery and one DC / DC converter, the voltage drops more due to voltage fluctuations the further the onboard electrical equipment is from the DC / DC converter, potentially leading to voltage instability. On the other hand, while vehicle power systems with two DC / DC converters can suppress voltage drops, voltage instability can still occur due to changes in the load on the electrical equipment, leaving room for improvement.

[0008] The purpose of this invention is to provide a vehicle power supply system capable of stabilizing the voltage of onboard electrical equipment.

[0009] Methods for solving problems

[0010] To achieve the above objectives, the vehicle power supply system according to the present invention is characterized by comprising: a power supply mounted on a vehicle; a first converter disposed on one side of the vehicle's length direction at a central position relative to the central position, and configured to transform DC power supplied from the power supply; a second converter disposed on the other side of the length direction relative to the central position, and configured to transform the DC power; a power line connecting the first converter and the second converter, and being supplied with both the power transformed by the first converter and the power transformed by the second converter; and a plurality of power distributors, each of which connects the power line to electrical equipment mounted on the vehicle and distributes the power supplied to the power line to the electrical equipment.

[0011] Invention Effects

[0012] The vehicle power supply system according to the present invention achieves the effect of stabilizing the voltage of the vehicle's electrical equipment. Attached Figure Description

[0013] Figure 1 This is a block diagram showing the schematic configuration of a vehicle power supply system according to the first embodiment.

[0014] Figure 2 This is a block diagram illustrating an example of the operation of a vehicle power supply system according to the first embodiment.

[0015] Figure 3 This is a block diagram illustrating an example of the operation of a vehicle power supply system according to the first embodiment when the load of multiple electrical devices configured in the first vehicle area increases.

[0016] Figure 4 This is a block diagram illustrating an example of the operation of a plurality of electrical devices configured in the first vehicle area and the second vehicle area of ​​the vehicle power supply system according to the first embodiment when the load increases.

[0017] Figure 5 It is a block diagram showing the flow of voltage and current information between two DC / DC converters and three power distributors.

[0018] Figure 6 This is a diagram showing the voltage and current information of three power distributors and the control status of the output voltage of two DC / DC converters.

[0019] Figure 7 This is a block diagram showing a schematic configuration of a vehicle power supply system according to a modified example of the second embodiment.

[0020] Figure 8This is a block diagram illustrating a normal operating example of a vehicle power supply system according to a modified example of the second embodiment.

[0021] Figure 9 This is a block diagram illustrating an example of the operation of a vehicle power supply system during a short circuit, a variation of the second embodiment.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Vehicle power supply system

[0024] 2. High-voltage battery

[0025] 3 First DC / DC converter

[0026] 4. Second DC / DC converter

[0027] 5 First power distributor

[0028] 6 Second power distributor

[0029] 7 Third power distributor

[0030] 9, 91, 92, 93, 94 Electrical equipment

[0031] 10 Power cord

[0032] 20 power cords

[0033] 100 vehicles

[0034] 101 First Vehicle Area

[0035] 102 Second Vehicle Area

[0036] 103 Third Vehicle Area Detailed Implementation

[0037] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below. That is, the constituent elements in the following embodiments include elements that are readily conceived by those skilled in the art or substantially the same elements, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

[0038] [First Implementation Method]

[0039] Figure 1 , Figure 2 , Figure 3 , Figure 4The vehicle power system 1 shown in this embodiment is installed, for example, in a vehicle 100 such as an EV (Electric Vehicle). The vehicle power system 1 is configured to include a high-voltage battery 2 installed in the vehicle 100, a first DC / DC converter 3, a second DC / DC converter 4, a first power distributor 5, a second power distributor 6, a third power distributor 7, a low-voltage battery 8, electrical equipment 9, and a power cord 10.

[0040] In the following explanation, the X direction shown in the illustration is defined as the "length direction X" of vehicle 100. This length direction X is, for example, equivalent to the front-rear direction of vehicle 100. Furthermore, the front side of the vehicle in the length direction X is defined as "front X1", and the rear side is defined as "rear X2".

[0041] The vehicle 100 includes a first vehicle area 101 located on the front (X1) side in the length direction X, a second vehicle area 102 located on the rear (X2) side in the length direction X, and a third vehicle area 103 located between the first vehicle area 101 and the second vehicle area 102 in the length direction X. That is, the vehicle 100 is divided into areas along the length direction X from the front (X1) side to the rear (X2) side, in the order of the first vehicle area 101, the third vehicle area 103, and the second vehicle area 102.

[0042] In the vehicle power system 1 of this embodiment, two DC / DC converters and three power distributors are respectively arranged on the front X1 side and the rear X2 side of the vehicle 100 and connected to a common power line 10. Voltage stabilization is achieved by changing the output voltage of each DC / DC converter through voltage monitors and current monitors provided on each power distributor.

[0043] The high-voltage battery 2 is mounted on the vehicle 100 and serves as the drive power source for powering the vehicle 100. The high-voltage battery 2 is a battery capable of storing DC power (hereinafter, also simply referred to as "power") at a relatively high voltage compared to the low-voltage battery 8, and can store power and discharge it as needed. The high-voltage battery 2 is connected to the first DC / DC converter 3 and the second DC / DC converter 4 via high-voltage lines 21. The high-voltage battery 2 is, for example, positioned between the first DC / DC converter 3 and the second DC / DC converter 4 along the longitudinal direction X of the vehicle.

[0044] The first DC / DC converter 3 and the second DC / DC converter 4 are configured as DC transformers capable of transforming electrical power.

[0045] The first DC / DC converter 3 is relative to Figure 1The vehicle 100 shown has its central position Oc in the length direction X positioned on one side (front X1) of that length direction X. Specifically, a first DC / DC converter 3 is disposed in the first vehicle area 101 to boost or buck the DC voltage supplied from the high-voltage battery 2. When disposed in the first vehicle area 101, the first DC / DC converter 3 is connected to a second DC / DC converter 4 via power line 10. The first DC / DC converter 3 applies the transformed DC voltage as an output voltage Vdf to power line 10 (see reference 10). Figure 6 Additionally, the first DC / DC converter 3 is connected to the second DC / DC converter 4 via communication line 22. The first DC / DC converter 3 transforms the power supplied from the high-voltage battery 2 via the high-voltage line 21 into a specified output voltage and outputs it to the power supply line 10.

[0046] The second DC / DC converter 4 is positioned opposite the central position Oc in the longitudinal direction X (rear X2). Specifically, the second DC / DC converter 4 is located in the second vehicle area 102 and boosts or bucks the DC voltage supplied from the high-voltage battery 2. When positioned in the second vehicle area 102, the second DC / DC converter 4 is connected to the first DC / DC converter 3 via the power line 10. The second DC / DC converter 4 applies the transformed DC voltage as an output voltage Vdr to the power line 10 (see reference 10). Figure 6 The second DC / DC converter 4 transforms the power supplied from the high-voltage battery 2 via the high-voltage line 21 into a specified output voltage and outputs it to the power line 10.

[0047] The first power distributor 5, the second power distributor 6, and the third power distributor 7 are, for example, electrical connection boxes. These electrical connection boxes are also known as relay boxes, junction boxes, etc. The first power distributor 5, the second power distributor 6, and the third power distributor 7 are interconnected via power lines 10.

[0048] The first power distributor 5 is disposed in the first vehicle area 101 and distributes power from the power line 10 to two electrical devices 9 within the first vehicle area 101. Specifically, the first power distributor 5 is disposed at the central position Oc of the vehicle 100 in the longitudinal direction X on the front X1 side, and has a first voltage monitor 11A, a first current monitor 12A, and a first ECU 13A.

[0049] The first voltage monitor 11A is connected to the power line 10 and measures the voltage Vf of the power supplied from the power line 10 to the first power distributor 5.

[0050] The first current monitor 12A is connected to the power line 10 and two electrical devices 9 within the first vehicle area 101 to measure the current If supplied from the power line 10 to the two electrical devices 9.

[0051] The first ECU 13A is connected to power line 10, through which it receives power from the first DC / DC converter 3 and is driven by this power. The first ECU 13A is also connected to a first voltage monitor 11A and a first current monitor 12A. It transmits the voltage Vf measured by the first voltage monitor 11A as voltage information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22. Additionally, the first ECU 13A transmits the current If measured by the first current monitor 12A as current information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22.

[0052] The second power distributor 6 is disposed in the second vehicle area 102 and distributes power from the power line 10 to the two electrical devices 9 in the second vehicle area 102 respectively. Specifically, the second power distributor 6 is disposed at the central position Oc of the vehicle 100 in the longitudinal direction X, on the rear X2 side, and has a second voltage monitor 11B, a second current monitor 12B, and a second ECU 13B.

[0053] The second voltage monitor 11B is connected to the power line 10 and measures the voltage Vr of the power supplied from the power line 10 to the second power distributor 6.

[0054] The second current monitor 12B is connected to the power line 10 and two electrical devices 9 in the second vehicle area 102 to measure the current Ir supplied from the power line 10 to the two electrical devices 9.

[0055] The second ECU 13B is connected to power line 10, through which it receives power from the first DC / DC converter 3 and is driven by this power. The second ECU 13B is also connected to the second voltage monitor 11B and the second current monitor 12B. It transmits the voltage Vr measured by the second voltage monitor 11B as voltage information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22. Additionally, the second ECU 13B transmits the current Ir measured by the first current monitor 12A as current information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22.

[0056] The third power distributor 7 is disposed in the third vehicle area 103 and distributes power from the power line 10 to the two electrical devices 9 in the third vehicle area 103 respectively. Specifically, the third power distributor 7 is disposed at the central position Oc side in the length direction X of the vehicle 100 and has a third voltage monitor 11C, a third current monitor 12C and a third ECU 13C.

[0057] The third voltage monitor 11C is connected to the power line 10 and measures the voltage Vm of the power supplied from the power line 10 to the third power distributor 7.

[0058] The third current monitor 12C is connected to the power line 10 and two electrical devices 9 in the third vehicle area 103 to measure the current Im supplied from the power line 10 to the two electrical devices 9.

[0059] The third ECU 13C is connected to power line 10, through which it receives power from the first DC / DC converter 3 and is driven by this power. The third ECU 13C is also connected to the third voltage monitor 11C and the third current monitor 12C. It transmits the voltage Vm measured by the third voltage monitor 11C as voltage information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22. Additionally, the third ECU 13C transmits the current Im measured by the third current monitor 12C as current information to the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22.

[0060] In the vehicle power supply system 1 of this embodiment, such as Figure 5 As shown, the first ECU 13A of the first power distributor 5, the second ECU 13B of the second power distributor 6, and the third ECU 13C of the third power distributor 7 are interconnected with the first DC / DC converter 3 and the second DC / DC converter 4 via communication line 22. Furthermore, the first DC / DC converter 3 and the second DC / DC converter 4 control their output voltages based on voltage information (Vf) and current information (If) received from the first ECU 13A of the first power distributor 5, voltage information (Vr) and current information (Ir) received from the second ECU 13B of the second power distributor 6, and voltage information (Vm) and current information (Im) received from the third ECU 13C of the third power distributor 7.

[0061] The low-voltage battery 8 is a rechargeable battery that supplies power at a relatively low voltage compared to the high-voltage battery 2, for example, having a voltage of about 12V. The low-voltage battery 8 is connected to the power line 10 via a fuse F, and is connected to the first DC / DC converter 3 via the power line 10.

[0062] Electrical equipment 9 is mounted on vehicle 100 and is a load driven by DC power. Electrical equipment 9 includes, for example, general loads such as air conditioning and audio systems, and important loads such as steering systems, braking systems, and sensors. Multiple pieces of electrical equipment 9 are respectively arranged in the first vehicle area 101, the second vehicle area 102, and the third vehicle area 103. Figures 1-4 (include Figures 7-9As shown in the diagram, in this embodiment, two electrical devices 9 are configured as a first device group A in the first vehicle area 101. Two electrical devices 9 are configured as a second device group B in the second vehicle area 102. Two electrical devices 9 are configured as a third device group C in the third vehicle area 103. Multiple electrical devices 9, for example, are... Figure 2 As shown, this includes electrical equipment 91 with a relatively small load compared to other electrical equipment 9. Additionally, among the plurality of electrical equipment 9, for example, such as... Figure 3 As shown, it includes electrical equipment 92 with a large load relative to electrical equipment 91 with a small load and electrical equipment 93 with a large load relative to electrical equipment 92.

[0063] Furthermore, among the multiple electrical devices 9, when the vehicle is in a driving state (e.g., the ignition switch is on), there are electrical devices that are always in the on state and electrical devices that change state to either the on state or the off state. Therefore, the loads of the first device group A, the second device group B, and the third device group C increase or decrease depending on the on / off state of each electrical device 9 and the magnitude of the load of each electrical device 9.

[0064] As described above, the power line 10 connects the first DC / DC converter 3 and the second DC / DC converter 4, and is supplied with both the power transformed by the first DC / DC converter 3 and the power transformed by the second DC / DC converter 4. The power line 10 is routed along the length direction X from the front X1 side to the rear X2 side, covering the first vehicle area 101, the third vehicle area 103, and the second vehicle area 102.

[0065] Next, refer to Figures 2-4 An example of the operation of the vehicle power supply system 1 will be explained. Figure 2 The vehicle power supply system 1 shown is in a state where the loads of the first equipment group A to the third equipment group C are all relatively small. Figure 3 The vehicle power system 1 shown is in a state where the load of the first equipment group A is relatively large compared to the second equipment group B and the third equipment group C. Figure 4 The vehicle power supply system 1 shown is in a state where the load of the first equipment group A is relatively large compared to the loads of the second equipment group B and the third equipment group C, and the loads of the second equipment group B and the third equipment group C are relatively large compared to the loads of the third equipment group C. Figure 3 The load shown is an increase compared to the previous state.

[0066] exist Figure 2 In the vehicle power supply system 1 shown, the first equipment group A to the third equipment group C respectively keep one of the two electrical devices 9 in the ON state and the other in the OFF state. The electrical device 9 in the ON state is designated as electrical device 91. When the loads of the first equipment group A to the third equipment group C are all relatively small, such as... Figure 6As shown, the currents If, Ir, and Im measured by the first current monitor 12A to the third current monitor 12C are all small. In this case, assuming that the output voltage Vdf of the first DC / DC converter 3 is equal to the output voltage Vdr of the second DC / DC converter 4, the voltages Vf, Vr, and Vm measured by the first voltage monitor 11A to the third voltage monitor 11C drop due to the resistor R of the power supply line 10, and the voltages Vf, Vr, and Vm measured by the first power distributor 5 to the third power distributor 7 become Vf0 (<Vdf), Vr0 (<Vdr), and Vc0 (Vc0 < Vf0, Vc0 < Vr0) (state 31). Assume Vf0, Vr0, and Vc0 are the target voltages.

[0067] In Figure 3 In the vehicle power supply system 1 shown, both of the two electrical devices 9 in the first device group A are in the on state, and one electrical device 91 in each of the two electrical devices 9 in the second device group B and the third device group C is in the on state, and the other is in the off state. Thus, when the load of the first device group A increases relatively compared to other device groups, the voltage drop of the first power distributor 5 caused by the first device group A becomes relatively larger, and the power supplied from the first DC / DC converter 3 to the third power distributor 7 slightly decreases. Therefore, the second DC / DC converter 4 supplements this reduced amount.

[0068] For example, as Figure 6 shown, when only If is relatively larger than Ir and Im among the currents If, Ir, and Im, the voltage Vf becomes Vf1 (Vf1 < Vf0) smaller than the target voltage Vf0, the voltage Vr becomes the target voltage Vr0, and the voltage Vc becomes the target voltage Vc0, the first DC / DC converter 3 and the second DC / DC converter 4 do not control the output voltages Vdf and Vdr (state 32).

[0069] In addition, when only Im is relatively larger than If and Ir among the currents If, Ir, and Im, the voltage Vf becomes Vf1 (Vf1 < Vf0) smaller than the target voltage Vf0, the voltage Vm becomes Vc1 (Vc1 < Vc0) lower than the target voltage Vc0, and the voltage Vr becomes Vr1 (Vr1 < Vr0) lower than the target voltage Vr0, the second DC / DC converter 4 keeps the output voltage Vdr unchanged, and the first DC / DC converter 3 increases the output voltage Vdf by the amount of (Vc0 - Vc1) (state 33).

[0070] In addition, when only Ir is relatively smaller than If and Im among the currents If, Ir and Im, and the voltage Vf is Vf1 (Vf1 < Vf0), the voltage Vm is Vc1 (Vc1 < Vc0), and the voltage Vr is Vr1 (Vr1 < Vr0), the first DC / DC converter 3 keeps the output voltage Vdf unchanged, and the second DC / DC converter 4 increases the output voltage Vdr by (the amount of Vc0 - Vc1) (state 34).

[0071] Furthermore, when only Ir is relatively larger than If and Im among the currents If, Ir, and Im, and the voltages Vf, Vm, and Vr are Vf0, Vm, and Vr1 (Vr1 < Vr0), the first DC / DC converter 3 and the second DC / DC converter 4 do not control the output voltages Vdf and Vdr (state 35).

[0072] Furthermore, when only Im is relatively smaller than If and Ir among the currents If, Ir, and Im, and the voltages Vf, Vf1 (Vf1 < Vf0), Vm, Vc1 (Vc1 < Vc0), and Vr, Vr1 (Vr1 < Vr0), if the current If < Ir, then the first DC / DC converter 3 increases the output voltage Vdf by (the amount of Vc0 - Vc1), and the second DC / DC converter 4 increases the output voltage Vdf by (the amount of Vc0 - Vc1) (state 36).

[0073] On the other hand, among the currents If, Ir, and Im, only If is relatively smaller compared to Im and Ir, and the voltages Vf, Vf1 (Vf1 < Vf0), Vm, Vc1 (Vc1 < Vc0), and Vr, Vr1 (Vr1 < Vr0), the second DC / DC converter 4 keeps the output voltage Vdr constant, while the first DC / DC converter 3 increases the output voltage Vdf by (the amount of Vc0 - Vc1) (state 37).

[0074] In addition, when the currents If, Ir, and Im all increase relatively, the voltage Vf is Vf1 (Vf1 < Vf0), the voltage Vm is Vc1 (Vc1 < Vc0), and the voltage Vr is Vr1 (Vr1 < Vr0), the first DC / DC converter 3 increases the output voltage Vdf by (the amount of Vc0 - Vc1), and the second DC / DC converter 4 increases the output voltage Vdf by (the amount of Vc0 - Vc1) (state 38).

[0075] As described above, the vehicle power supply system 1 according to this embodiment includes: a high-voltage battery 2 mounted on a vehicle 100; a first DC / DC converter 3 disposed on the front X1 side of the vehicle 100, configured to transform the DC power supplied from the high-voltage battery 2; a second DC / DC converter 4 disposed on the rear X2 side in the longitudinal direction X, configured to transform the DC power; a power line 10 connecting the first DC / DC converter 3 and the second DC / DC converter 4, and being supplied with both the power transformed by the first DC / DC converter 3 and the power transformed by the second DC / DC converter 4; and a first power distributor 5, a second power distributor 6, and a third power distributor 7, which respectively connect the power line 10 to a plurality of electrical devices 9 mounted on the vehicle 100 and distribute the power supplied to the power line 10 to the plurality of electrical devices 9.

[0076] In this way, the vehicle power system 1 can stabilize the voltage by controlling the power supplied from the first DC / DC converter 3 and the second DC / DC converter 4 to the power line 10.

[0077] In addition, in the vehicle power system 1, the first power distributor 5 has: a first voltage monitor 11A that measures the voltage Vf of the power supplied from the power line 10 to the first power distributor 5 as voltage information; and a first current monitor 12A that measures the current If supplied from the power line 10 to the two electrical devices 9 as current information.

[0078] The second power distributor 6 includes: a second voltage monitor 11B, which measures the voltage Vr of the power supplied from the power line 10 to the second power distributor 6 as voltage information; and a second current monitor 12B, which measures the current Ir supplied from the power line 10 to the two electrical devices 9 as current information.

[0079] The third power distributor 7 includes: a third voltage monitor 11C, which measures the voltage Vm of the power supplied to the third power distributor 7 from the power line 10 as voltage information; and a third current monitor 12C, which measures the current Im supplied from the power line 10 to the two electrical devices 9 as current information.

[0080] Furthermore, the first DC / DC converter 3 and the second DC / DC converter 4 control the output voltages Vdf and Vdr based on multiple voltage information (Vf, Vr, Vm) and multiple current information (If, Ir, Im) received from the first power distributor 5, the second power distributor 6, and the third power distributor 7, respectively.

[0081] In this way, the vehicle power system 1 can control the output voltage of the first DC / DC converter 3 and the second DC / DC converter 4 based on the voltage and current information received from the three power distributors on the power line 10, thereby achieving voltage stabilization.

[0082] [Second Implementation]

[0083] Next, for Figure 7 , Figure 8 , Figure 9 The second embodiment shown herein relates to a vehicle power supply system 1A. The vehicle power supply system 1A differs from the vehicle power supply system 1 described above in that the second DC / DC converter 4 is connected to a portion of the first power distributor 5, the second power distributor 6, the third power distributor 7, and multiple electrical devices 9 via an auxiliary power line 20, which is different from the power line 10. Furthermore, in the second embodiment, the same reference numerals are used to denote the same components as in the first embodiment, and detailed descriptions are omitted.

[0084] The vehicle power system 1A has five auxiliary power lines 20 that are different from the main power line 10. One side of the five auxiliary power lines 20 is connected to the second DC / DC converter 4 via a fuse, and the other side is connected to the first power distributor 5, the second power distributor 6, the third power distributor 7 and two electrical devices 9 via forward diodes.

[0085] The second DC / DC converter 4 is connected to the first ECU 13A of the first power distributor 5 via the auxiliary power line 20, supplying power to the first ECU 13A. Additionally, the second DC / DC converter 4 is connected to the second ECU 13B of the second power distributor 6 via the auxiliary power line 20, supplying power to the second ECU 13B. Furthermore, the second DC / DC converter 4 is connected to the third ECU 13C of the third power distributor 7 via the auxiliary power line 20, supplying power to the third ECU 13C. That is, in the second embodiment, the first ECU 13A, the second ECU 13B, and the third ECU 13C are all powered by both the first DC / DC converter 3 and the second DC / DC converter 4, and are driven by this power.

[0086] In this embodiment, the first vehicle area 101 and the third vehicle area 103 are each equipped with two electrical devices 9. One of these electrical devices 9 is a general load (air conditioner, audio system, etc.), and the other is an important load (steering device, braking device, sensor, etc.). The electrical device 94 in this embodiment is an important load. All electrical devices 94 are connected to the power supply line 10 and the auxiliary power supply line 20. That is, all electrical devices 94 are powered by both the first DC / DC converter 3 and the second DC / DC converter 4.

[0087] Next, refer to Figure 8 , Figure 9 An example of the operation of the vehicle power supply system 1A will be explained. Figure 8 The vehicle power supply system 1A shown is in its normal state. Figure 9 The vehicle power system 1A shown is in a state where the fuse F between the low-voltage battery 8 and the power line 10 is blown due to a short circuit in the power line 10, and the fuse F between the low-voltage battery 8 and the first DC / DC converter 3 is also blown.

[0088] exist Figure 8 In the vehicle power system 1A shown, under normal conditions, power is supplied from both the first DC / DC converter 3 and the second DC / DC converter 4 via power line 10 and auxiliary power line 20 to the first ECU 13A, the second ECU 13B, the third ECU 13C, and two electrical devices 9B. For example, as... Figure 9 As shown, in the event of a short circuit (e.g., grounding) at point P between the first power distributor 5 and the third power distributor 7 on the power line 10, the fuses F between the low-voltage battery 8 and the power line 10, and between the first DC / DC converter 3 and the power line 10, will blow due to overcurrent to protect the electrical equipment 9. In this case, the first DC / DC converter 3 stops supplying power to the first power distributor 5, the second power distributor 6, the third power distributor 7, and the six electrical devices 9. On the other hand, the second DC / DC converter 4 continues to supply power to the first ECU 13A, the second ECU 13B, the third ECU 13C, and the two electrical devices 9B respectively. Even if the power supply from the first DC / DC converter 3 stops, the first ECU 13A, the second ECU 13B, the third ECU 13C, and the two electrical devices 9B can still be continuously driven by the power supply from the second DC / DC converter 4.

[0089] As explained above, in the vehicle power system 1A according to this embodiment, the second DC / DC converter 4 is connected to the first power distributor 5, the second power distributor 6, the third power distributor 7, and two electrical devices 9B via an auxiliary power line 20, which is different from the power line 10. Power is supplied to the ECU of the power distributor, which is an important load, and the electrical devices 9B via the auxiliary power line 20. Therefore, even if the power supply from the first DC / DC converter 3 is interrupted due to a short circuit in the power line 10, the vehicle power system 1A can still continuously supply power to the ECU of the power distributor and the important loads from the second DC / DC converter 4, thus achieving redundancy in the vehicle power system 1A.

[0090] Furthermore, in the first and second embodiments described above, the power line 10 is laid in a straight line along the length direction X relative to the vehicle 100, but it is not limited to this.

[0091] In addition, in the first and second embodiments described above, the vehicle 100 is divided into three areas: a first vehicle area 101, a third vehicle area 103, and a second vehicle area 102, but is not limited to these areas.

[0092] In addition, in the first and second embodiments described above, two electrical devices 9 are respectively provided in the first vehicle area 101, the second vehicle area 102 and the third vehicle area 103, but it is not limited to this.

Claims

1. A power supply system for a vehicle, characterized in that, have: A power source, which is mounted in the vehicle; A first converter is disposed on one side of the vehicle in the longitudinal direction relative to the central position of the vehicle, and is configured to transform DC power supplied from the power source. The second converter is disposed on the opposite side of the length direction relative to the central position and is configured to transform the DC power. A power cord that connects the first converter and the second converter, and is supplied with both the power mutated by the first converter and the power mutated by the second converter. as well as Multiple power distributors, each of which connects the power line to electrical equipment mounted on the vehicle and distributes power supplied from the power line to the electrical equipment.

2. The vehicle power supply system as described in claim 1, characterized in that, The power distributor has: A voltage monitor that measures the voltage of the power supplied from the power line to the power distributor as voltage information; as well as A current monitor measures the current supplied from the power line to the plurality of electrical devices as current information. Each of the first converter and the second converter controls its output voltage based on multiple voltage and current information received from the multiple power distributors.

3. The vehicle power supply system as described in claim 2, characterized in that, The vehicle includes a first vehicle area located on one side of the length direction, a second vehicle area located on the other side of the length direction, and a third vehicle area located between the first vehicle area and the second vehicle area in the length direction. The first converter is located in the first vehicle area. The second converter is located in the second vehicle area. The plurality of power distributors include: A first power distributor is disposed in the first vehicle area and distributes the power supplied from the power line to a plurality of electrical devices corresponding to the first vehicle area. A second power distributor is disposed in the second vehicle area to distribute the power supplied from the power line to a plurality of electrical devices corresponding to the second vehicle area. as well as A third power distributor, located in the third vehicle area, distributes the power supplied from the power line to a plurality of electrical devices corresponding to the third vehicle area. At least the third power distributor is capable of distributing power from both the first converter and the second converter to the power line to the plurality of electrical devices corresponding to the third vehicle area. Each of the first converter and the second converter controls the output voltage based on the voltage and current information received from the first power distributor, the voltage and current information received from the second power distributor, and the voltage and current information received from the third power distributor.

4. The vehicle power supply system as described in any one of claims 1 to 3, characterized in that, The second converter is connected to a plurality of power distributors and a portion of a plurality of electrical devices via a secondary power line different from the power line, and supplies power to each of the power distributors and a portion of each of the electrical devices via the secondary power line.

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