Vehicle power supply system

Abstract

To provide a vehicle power supply system capable of stabilizing a voltage to an on-vehicle electric device.SOLUTION: A vehicle power supply system 1 includes: a high-voltage battery 2 mounted on a vehicle 100; a first DC / DC converter 3 which is arranged on a front X1 side of the vehicle 100 and can transform DC power supplied from the high-voltage battery 2; a second DC / DC converter 4 which is arranged on a rear X2 side in a longitudinal direction X and can transform the DC power; a power supply line 10 which connects the first DC / DC converter 3 and the second DC / DC converter 4, and to which both of the power transformed by the first DC / DC converter 3 and the power transformed by the second DC / DC converter 4 are supplied; and a first power distributor 5, a second power distributor 6, and a third power distributor 7 which each connect the power supply line 10 and a plurality of electric devices 9 mounted on the vehicle 100, and distribute the power supplied to the power supply line 10 to the plurality of electric devices 9.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle power supply system. [Background technology]

[0002] There is a vehicle power supply system in which two DC / DC converters, two batteries, and two switching relays are arranged in a vehicle (see, for example, Patent Document 1). In this vehicle power supply system, when the output voltage supplied from one DC / DC converter is below a predetermined value, the output voltage supplied from the other DC / DC converter is compensated for by combining ON / OFF of the switching relay, thereby ensuring power supply to the on-board electrical devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-29200 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional vehicle power supply system having one battery and one DC / DC converter, the voltage value of an on-board electrical device decreases as the device is further away from the DC / DC converter, which can cause the voltage of the electrical device to become unstable. On the other hand, in a vehicle power supply system having two DC / DC converters, although the voltage drop is suppressed by these two DC / DC converters, voltage may become unstable due to fluctuations in the load of the electrical device, leaving room for improvement.

[0005] An object of the present invention is to provide a vehicle power supply system that can stabilize the voltage to on-board electrical devices. [Means for solving the problem]

[0006] In order to achieve the above object, the vehicle power supply system of the present invention is characterized by comprising: a power supply mounted on a vehicle; a first converter arranged on one side of a longitudinal center position of the vehicle and configured to transform DC power supplied from the power supply; a second converter arranged on the other side of the longitudinal center position and configured to transform the DC power; a power supply line connecting the first converter and the second converter and supplying both the power transformed by the first converter and the power transformed by the second converter; and a plurality of power supply distributors each connecting the power supply line to electrical devices mounted on the vehicle and distributing the power supplied to the power supply line to the electrical devices. [Effects of the Invention]

[0007] The vehicle power supply system according to the present invention has the effect of stabilizing the voltage supplied to the on-board electrical devices. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a vehicle power supply system according to a first embodiment. [Figure 2] FIG. 2 is a block diagram showing an example of the operation of the vehicle power supply system according to the first embodiment. [Figure 3] FIG. 3 is a block diagram showing an example of operation when the loads of a plurality of electrical devices arranged in the first vehicle area of ​​the vehicle power supply system according to the first embodiment increase. [Figure 4] FIG. 4 is a block diagram showing an example of operation when the loads of a plurality of electrical devices arranged in the first vehicle area and the second vehicle area of ​​the vehicle power supply system according to the first embodiment increase. [Figure 5] FIG. 5 is a block diagram showing the flow of voltage information and current information between two DC / DC converters and three power distributors. [Figure 6]FIG. 6 is a diagram showing voltage information and current information by three power supply distributors and the control state of the output voltages of two DC / DC converters. [Figure 7] FIG. 7 is a block diagram showing a schematic configuration of a vehicle power supply system according to a modified example of the second embodiment. [Figure 8] FIG. 8 is a block diagram showing an example of normal operation of a vehicle power supply system according to a modified example of the second embodiment. [Figure 9] FIG. 9 is a block diagram showing an example of operation of a vehicle power supply system according to a modified example of the second embodiment when a short circuit occurs. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments. That is, the components in the following embodiments include those that can be easily imagined by a person skilled in the art or those that are substantially the same, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

[0010] [First embodiment] A vehicle power supply system 1 according to this embodiment, shown in Figures 1, 2, 3, and 4, is mounted on a vehicle 100 such as an EV (Electric Vehicle). The vehicle power supply system 1 includes a high-voltage battery 2, a first DC / DC converter 3, a second DC / DC converter 4, a first power supply distributor 5, a second power supply distributor 6, a third power supply distributor 7, a low-voltage battery 8, electrical equipment 9, and a power supply line 10, all of which are mounted on the vehicle 100.

[0011] In the following description, the illustrated X direction will be referred to as the "longitudinal direction X" of the vehicle 100. This longitudinal direction X corresponds to, for example, the front-to-rear direction of the vehicle 100. In addition, within the longitudinal direction X, the front side of the vehicle will be referred to as the "front X1" and the rear side will be referred to as the "rear X2."

[0012] The vehicle 100 includes a first vehicle area 101 located on the front X1 side in the longitudinal direction X, a second vehicle area 102 located on the rear X2 side in the longitudinal direction X, and a third vehicle area 103 located between the first vehicle area 101 and the second vehicle area 102 in the longitudinal direction X. In other words, the vehicle 100 is divided into areas in the order of the first vehicle area 101, the third vehicle area 103, and the second vehicle area 102 along the longitudinal direction X, from the front X1 side to the rear X2 side.

[0013] In the vehicle power supply system 1 of this embodiment, two DC / DC converters and three power supply distributors are arranged on the front X1 side and rear X2 side of the vehicle 100, respectively, and are connected to a common power supply line 10. The output voltage of each DC / DC converter is changed and voltage stabilization is achieved by using a voltage monitor and a current monitor provided in each power supply distributor.

[0014] The high-voltage battery 2 is mounted on the vehicle 100 and serves as a drive power source for driving the vehicle 100. The high-voltage battery 2 is a storage battery capable of storing DC power (hereinafter simply referred to as "power") at a higher voltage than the low-voltage battery 8, and is capable of storing power and discharging 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 disposed, for example, between the first DC / DC converter 3 and the second DC / DC converter 4 in the longitudinal direction X of the vehicle.

[0015] The first DC / DC converter 3 and the second DC / DC converter 4 are each a DC transformer configured to be able to transform electric power.

[0016] The first DC / DC converter 3 is arranged on one side (forward X1) in the longitudinal direction X of the vehicle 100 with respect to a center position Oc in the longitudinal direction X shown in Fig. 1. Specifically, the first DC / DC converter 3 is arranged in a first vehicle area 101 and boosts or lowers the DC voltage supplied from the high-voltage battery 2. While arranged in the first vehicle area 101, the first DC / DC converter 3 is connected to the second DC / DC converter 4 via a power supply line 10. The first DC / DC converter 3 applies the transformed DC voltage as an output voltage Vdf to the power supply line 10 (see Fig. 6). The first DC / DC converter 3 is also connected to the second DC / DC converter 4 via a communication line 22. The first DC / DC converter 3 transforms power supplied from the high-voltage battery 2 via a high-voltage line 21 to a predetermined output voltage and outputs it to the power supply line 10.

[0017] The second DC / DC converter 4 is disposed on the other side (rear X2) in the longitudinal direction X with respect to the central position Oc. Specifically, the second DC / DC converter 4 is disposed in the second vehicle area 102 and boosts or lowers the DC voltage supplied from the high-voltage battery 2. While disposed in the second vehicle area 102, the second DC / DC converter 4 is connected to the first DC / DC converter 3 via a power supply line 10. The second DC / DC converter 4 applies the transformed DC voltage as an output voltage Vdr to the power supply line 10 (see FIG. 6). The second DC / DC converter 4 transforms the power supplied from the high-voltage battery 2 via the high-voltage line 21 to a predetermined output voltage and outputs it to the power supply line 10.

[0018] The first power distributor 5, the second power distributor 6, and the third power distributor 7 are each, for example, an electrical connection box. An electrical connection box is what is called a relay box, a junction box, or the like. The first power distributor 5, the second power distributor 6, and the third power distributor 7 are connected to each other via a power line 10.

[0019] The first power supply distributor 5 is disposed in the first vehicle area 101, and distributes power from the power supply line 10 to each of two electrical devices 9 within the first vehicle area 101. Specifically, the first power supply distributor 5 is disposed on the front X1 side with respect to a central position Oc in the longitudinal direction X of the vehicle 100, and has a first voltage monitor 11A, a first current monitor 12A, and a first ECU 13A.

[0020] The first voltage monitor 11A is connected to the power supply line 10 and measures the voltage Vf of the power supplied from the power supply line 10 to the first power distributor 5.

[0021] The first current monitor 12A is connected to the power supply line 10 and two electric devices 9 in the first vehicle area 101, and measures the current If supplied from the power supply line 10 to the two electric devices 9.

[0022] The first ECU 13A is connected to a power supply line 10, and is driven by power supplied from the first DC / DC converter 3 via the power supply line 10. The first ECU 13A is connected to a first voltage monitor 11A and a first current monitor 12A, and transmits a 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 a communication line 22. The first ECU 13A also transmits a 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 the communication line 22.

[0023] The second power supply distributor 6 is disposed in the second vehicle area 102, and distributes power from the power supply line 10 to each of two electrical devices 9 in the second vehicle area 102. Specifically, the second power supply distributor 6 is disposed on the rear X2 side with respect to the center position Oc in the longitudinal direction X of the vehicle 100, and has a second voltage monitor 11B, a second current monitor 12B, and a second ECU 13B.

[0024] The second voltage monitor 11B is connected to the power supply line 10 and measures the voltage Vr of the power supplied from the power supply line 10 to the second power distributor 6.

[0025] The second current monitor 12B is connected to the power supply line 10 and two electric devices 9 in the second vehicle area 102, and measures the current Ir supplied from the power supply line 10 to the two electric devices 9.

[0026] The second ECU 13B is connected to a power supply line 10, and is driven by power supplied from the first DC / DC converter 3 via the power supply line 10. The second ECU 13B is connected to a second voltage monitor 11B and a second current monitor 12B, and 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 a communication line 22. The second ECU 13B also 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 the communication line 22.

[0027] The third power supply distributor 7 is disposed in the third vehicle area 103, and distributes power from the power supply line 10 to each of two electrical devices 9 within the third vehicle area 103. Specifically, the third power supply distributor 7 is disposed on the side of the center position Oc in the longitudinal direction X of the vehicle 100, and includes a third voltage monitor 11C, a third current monitor 12C, and a third ECU 13C.

[0028] The third voltage monitor 11C is connected to the power supply line 10 and measures the voltage Vr of the power supplied from the power supply line 10 to the third power distributor .

[0029] The third current monitor 12C is connected to the power supply line 10 and two electric devices 9 in the third vehicle area 103, and measures the current Im supplied from the power supply line 10 to the two electric devices 9.

[0030] The third ECU 13C is connected to a power supply line 10, and is driven by power supplied from the first DC / DC converter 3 via the power supply line 10. The third ECU 13C is connected to a third voltage monitor 11C and a third current monitor 12C, and transmits a 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 a communication line 22. The third ECU 13C also transmits a 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 the communication line 22.

[0031] 5 , in the vehicle power supply system 1 of this embodiment, a first ECU 13A of the first power supply distributor 5, a second ECU 13B of the second power supply distributor 6, and a third ECU 13C of the third power supply distributor 7 are connected to the first DC / DC converter 3 and the second DC / DC converter 4 via a communication line 22. 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 supply distributor 5, voltage information (Vr) and current information (Ir) received from the second ECU 13B of the second power supply distributor 6, and voltage information (Vm) and current information (Im) received from the third ECU 13C of the third power supply distributor 7, respectively.

[0032] The low-voltage battery 8 is a storage battery that supplies power at a lower voltage relative to the high-voltage battery 2, and has a voltage of, for example, about 12 V. The low-voltage battery 8 is connected to a power supply line 10 via a fuse F, and is connected to the first DC / DC converter 3 via the power supply line 10.

[0033] The electrical devices 9 are loads mounted on the vehicle 100 and driven by DC power. The electrical devices 9 include, for example, general loads such as an air conditioner and audio equipment, and important loads such as a steering device, a brake device, and sensors. A plurality of electrical devices 9 are arranged in each of the first vehicle area 101, the second vehicle area 102, and the third vehicle area 103. As shown in FIGS. 1 to 4 (including FIGS. 7 to 9), in this embodiment, two electrical devices 9 are arranged as a first device group A in the first vehicle area 101. Two electrical devices 9 are arranged as a second device group B in the second vehicle area 102. Two electrical devices 9 are arranged as a third device group C in the third vehicle area 103. The plurality of electrical devices 9 includes, for example, an electrical device 91 having a relatively small load compared to the other electrical devices 9, as shown in FIG. 2. The plurality of electrical appliances 9 also includes, for example, an electrical appliance 92 having a relatively large load compared to an electrical appliance 91 having a small load, and an electrical appliance 93 having a relatively large load compared to the electrical appliance 92, as shown in FIG.

[0034] Furthermore, when the vehicle is in a driving state (for example, the ignition switch is in an ON state), some of the electrical devices 9 are always in an ON state, while others transition between an ON state and an 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.

[0035] As described above, the power supply line 10 connects the first DC / DC converter 3 and the second DC / DC converter 4, and supplies both the power transformed by the first DC / DC converter 3 and the power transformed by the second DC / DC converter 4. The power supply line 10 is routed in the longitudinal direction X from the front X1 side to the rear X2 side, across the first vehicle area 101, the third vehicle area 103, and the second vehicle area 102.

[0036] Next, an operation example of the vehicle power supply system 1 will be described with reference to FIGS. 2 to 4. In the vehicle power supply system 1 shown in FIG. 2, the loads of the first equipment group A to the third equipment group C are all relatively small. In the vehicle power supply system 1 shown in FIG. 3, the load of the first equipment group A is relatively large compared to the second equipment group B and the third equipment group C. In the vehicle power supply system 1 shown in FIG. 4, the load of the first equipment group A is relatively large compared to 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 have increased compared to those shown in FIG. 3.

[0037] In the vehicle power supply system 1 shown in FIG. 2, in each of the first equipment group A to the third equipment group C, one of the two electric devices 9 is in the ON state and the other is in the OFF state. The electric device 9 in the ON state is taken as the electric device 91. When the loads of the first equipment group A to the third equipment group C are all relatively small, as shown in FIG. 6, the currents If, Ir, 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 and the output voltage Vdr of the second DC / DC converter 4 are the same, the voltages Vf, Vr, Vm measured by the first voltage monitor 11A to the third voltage monitor 11C have a voltage drop due to the resistance R of the power line 10, and the voltages Vf, Vr, Vm measured by the first power distributor 5 to the third power distributor 7 are Vf0 (<Vdf), Vr0 (<Vdr), Vc0 (Vc0 <Vf0, Vc0 <Vr0) (state 31). Assuming that Vf0, Vr0, Vc0 are the target voltages.

[0038] In the vehicle power supply system 1 shown in FIG. 3, in the first equipment group A, both of the two electric devices 9 are in the ON state, and in the second equipment group B and the third equipment group C, one of the two electric devices 91 is in the ON state and the other is in the OFF state. Thus, when the load of the first equipment group A increases relatively compared to other equipment groups, the voltage drop of the first power distributor 5 due to the first equipment group A becomes relatively large, and the power from the first DC / DC converter 3 to the third power distributor 7 slightly decreases. Therefore, this reduced amount is compensated by the second DC / DC converter 4.

[0039] When only If among the currents If, Ir, and Im becomes relatively large compared to Ir and Im, the voltage Vf becomes 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 output voltages Vdf and Vdr are not controlled (state 32).

[0040] Also, when only Im among the currents If, Ir, and Im becomes relatively large compared to If and Ir, the voltage Vf becomes 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 as it is, and the first DC / DC converter 3 increases the output voltage Vdf by (Vc0 - Vc1) (state 33).

[0041] Also, when only Ir among the currents If, Ir, and Im becomes relatively small compared to If and Im, the voltage Vf is 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 as it is, and as shown in FIG. 4, the second DC / DC converter 4 increases the output voltage Vdr by (Vc0 - Vc1) (state 34).

[0042] Furthermore, when only Ir among the currents If, Ir, and Im becomes relatively large compared to If and Im, the voltage Vf is Vf0, the voltage Vm is Vc0, and the voltage Vr is 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).

[0043] Also, when only Im among the currents If, Ir, and Im becomes relatively small compared to If and Ir, and the voltage Vf becomes Vf1 (<Vf0), the voltage Vm becomes Vc1 (Vc1 <Vc0), and the voltage Vr becomes Vr1 (Vr1 <Vr0), if the current If <Ir, the first DC / DC converter 3 increases the output voltage Vdf by (Vc0 - Vc1), and the second DC / DC converter 4 increases the output voltage Vdf by (Vc0 - Vc1) (state 36).

[0044] On the other hand, when only If among the currents If, Ir, and Im becomes relatively small compared to Im and Ir, and the voltage Vf becomes Vf1 (<Vf0), the voltage Vm becomes Vc1 (Vc1 <Vc0), and the voltage Vr becomes Vr1 (Vr1 <Vr0), the second DC / DC converter 4 keeps the output voltage Vdr as it is, and the first DC / DC converter 3 increases the output voltage Vdf by (Vc0 - Vc1) (state 37).

[0045] Also, when all of the currents If, Ir, and Im become relatively large, and the voltage Vf becomes Vf1 (<Vf0), the voltage Vm becomes Vc1 (Vc1 <Vc0), and the voltage Vr becomes Vr1 (Vr1 <Vr0), the first DC / DC converter 3 increases the output voltage Vdf by (Vc0 - Vc1), and the second DC / DC converter 4 increases the output voltage Vdf by (Vc0 - Vc1) (state 38).

[0046] As described above, the vehicle power supply system 1 according to this embodiment includes the high-voltage battery 2 mounted on the vehicle 100, the first DC / DC converter 3 arranged on the front X1 side of the vehicle 100 and configured to transform DC power supplied from the high-voltage battery 2, the second DC / DC converter 4 arranged on the rear X2 side in the longitudinal direction X and configured to transform DC power, the power supply line 10 connecting the first DC / DC converter 3 and the second DC / DC converter 4 and supplying both the power transformed by the first DC / DC converter 3 and the power transformed by the second DC / DC converter 4, and the first power supply distributor 5, the second power supply distributor 6, and the third power supply distributor 7 respectively connecting the power supply line 10 to a plurality of electrical devices 9 mounted on the vehicle 100 and distributing the power supplied to the power supply line 10 to the plurality of electrical devices 9.

[0047] In this way, the vehicle power supply system 1 can stabilize the voltage by controlling the power supplied from the first DC / DC converter 3 and the second DC / DC converter 42 to the power supply line 10.

[0048] In addition, the vehicle power supply system 1 includes a first voltage monitor 11A that measures, as voltage information, the voltage Vf of the power supplied from the power line 10 to the first power supply distributor 5, and a first current monitor 12A that measures, as current information, the current If supplied from the power line 10 to the two electrical devices 9.

[0049] The second power supply distributor 6 has a second voltage monitor 11B that measures the voltage Vr of the power supplied to the second power supply distributor 6 from the power supply line 10 as voltage information, and a second current monitor 12B that measures the current supplied to the two electrical devices 9 from the power supply line 10 as current information.

[0050] The third power supply distributor 7 has a third voltage monitor 11C that measures the voltage Vm of the power supplied to the third power supply distributor 7 from the power line 10 as voltage information, and a third current monitor 12C that measures the current Im supplied to the two electrical devices 9 from the power line 10 as current information.

[0051] The first DC / DC converter 3 and the second DC / DC converter 4 control the output voltages Vdf and Vdr based on the plurality of voltage information (Vf, Vr, Vm) and the plurality of current information (If, Ir, Im) received from the first power distributor 5, the second power distributor 6, and the third power distributor 7, respectively.

[0052] In this way, the vehicle power supply system 1 is able to control the output voltages of the first DC / DC converter 3 and the second DC / DC converter 42 based on the voltage information and current information received from the three power supply distributors on the power supply line 10, thereby enabling voltage stabilization.

[0053] [Second embodiment] Next, a vehicle power supply system 1A according to a second embodiment shown in Figures 7, 8, and 9 will be described. Vehicle power supply system 1A differs from the above-described vehicle power supply system 1 in that a second DC / DC converter 4 is connected to a first power supply distributor 5, a second power supply distributor 6, a third power supply distributor 7, and some of a plurality of electrical devices 9 via a sub-power supply line 20 that is different from the power supply line 10. In the second embodiment, the same components as those in the above-described first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0054] The vehicle power supply system 1 includes five sub-power lines 20 that are different from the power line 10. One end of each of the five sub-power lines 20 is connected to the second DC / DC converter 4 via a fuse, and the other end 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, respectively.

[0055] The second DC / DC converter 4 is connected to the first ECU 13A of the first power supply distributor 5 via a sub-power supply line 20 and supplies power to the first ECU 13A. The second DC / DC converter 4 is also connected to the second ECU 13B of the second power supply distributor 6 via a sub-power supply line 20 and supplies power to the second ECU 13B. The second DC / DC converter 4 is also connected to the third ECU 13C of the third power supply distributor 7 via a sub-power supply line 20 and supplies power to the third ECU 13C. In other words, the first ECU 13A, the second ECU 13B, and the third ECU 13C of the second embodiment are all supplied with power from both the first DC / DC converter 3 and the second DC / DC converter 4 and are driven by the power.

[0056] In this embodiment, two electric devices 9 are arranged in each of the first vehicle area 101 and the third vehicle area 103, and one of the two electric devices 9 is a general load (air conditioner, audio, etc.) and the other is an important load (steering device, brake device, sensor, etc.). The electric devices 94 in this embodiment are important loads. All of the electric devices 94 are connected to the power supply line 10 and the sub-power supply line 20. That is, all of the electric devices 94 are supplied with power from both the first DC / DC converter 3 and the second DC / DC converter 4 and are driven by this power.

[0057] Next, an example of the operation of the vehicle power supply system 1A will be described with reference to Figures 8 and 9. The vehicle power supply system 1A shown in Figure 8 is in a normal state. The vehicle power supply system 1A shown in Figure 9 is in a state in which a short circuit in the power supply line 10 has caused the fuse F between the low-voltage battery 8 and the power supply line 10 to blow, and the fuse F between the low-voltage battery 8 and the first DC / DC converter 3 to blow.

[0058] In the vehicle power supply system 1A shown in Fig. 8, under normal conditions, power is supplied from both the first DC / DC converter 3 and the second DC / DC converter 4 to each of the first ECU 13A, the second ECU 13B, the third ECU 13C, and two electric devices 94 via the power supply line 10 and the sub-power supply line 20. For example, as shown in Fig. 9, if a short circuit (e.g., grounding) occurs in the power supply line 10 at point P between the first power supply distributor 5 and the third power supply distributor 7, the fuse F between the low-voltage battery 8 and the power supply line 10 and the fuse F between the first DC / DC converter 3 and the power supply line 10 will blow due to an overcurrent to protect the electric devices 9. In this case, the first DC / DC converter 3 stops supplying power to the first power supply distributor 5, the second power supply distributor 6, the third power supply distributor 7, and the six electric 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 electric devices 94. Even if the power supply from the first DC / DC converter 3 is stopped, the first ECU 13A, the second ECU 13B, the third ECU 13C, and the two electric devices 94 can continue to be driven by the power supply from the second DC / DC converter 4.

[0059] As described above, in the vehicle power supply 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 the two electrical devices 94 via the sub-power line 20, which is different from the power line 10, and supplies power to the ECUs of the power distributors, which are important loads, and the electrical devices 94 via the sub-power line 20. As a result, even if a short circuit or the like occurs on the power supply line 10 and the power supply from the first DC / DC converter 3 stops, the vehicle power supply system 1A can continue to supply power from the second DC / DC converter 4 to the ECUs of the power distributors and the important loads, thereby achieving redundancy in the vehicle power supply system 1A.

[0060] In the first and second embodiments, the power supply line 10 is routed linearly along the longitudinal direction X of the vehicle 100, but the present invention is not limited to this.

[0061] In addition, in the first and second embodiments, the vehicle 100 is divided into three areas: the first vehicle area 101, the third vehicle area 103, and the second vehicle area 102, but this is not limitative.

[0062] Furthermore, in the above first and second embodiments, two electrical devices 9 are arranged in each of the first vehicle area 101, the second vehicle area 102, and the third vehicle area 103, but this is not limited to this. [Explanation of symbols]

[0063] 1. Vehicle power supply system 2 High-voltage battery 3. First DC / DC converter 4 Second DC / DC converter 5 1st power distributor 6 2nd power divider 7 Third power divider 9,91,92,93,94 Electrical Equipment 10 Power Line 20 Sub power line 100 vehicles 101 First Vehicle Area 102 Second Vehicle Area 103 Third Vehicle Area

Claims

1. a power source installed in the vehicle; a first converter disposed on one side of a longitudinal center position of the vehicle, the first converter being configured to transform DC power supplied from the power source; a second converter disposed on the other side of the central position in the longitudinal direction and configured to transform the DC power; a power supply line connecting the first converter and the second converter and through which both the power transformed by the first converter and the power transformed by the second converter are supplied; a plurality of power distributors each connecting the power supply line to an electrical device mounted on the vehicle and distributing the power supplied to the power supply line to the electrical device; A vehicle power supply system comprising:

2. The power supply distributor comprises: a voltage monitor that measures the voltage of the power supplied from the power line to the power distributor as voltage information; a current monitor that measures current information of a current supplied from the power supply line to the plurality of electrical devices, The first converter and the second converter are Each of the power supply dividers controls an output voltage based on a plurality of pieces of voltage information and a plurality of pieces of current information received from the plurality of power supply dividers.

2. The vehicle power supply system according to claim 1.

3. the vehicle includes a first vehicle area located on one side in the longitudinal direction, a second vehicle area located on the other side in the longitudinal direction, and a third vehicle area located between the first vehicle area and the second vehicle area in the longitudinal direction, The first converter is provided in the first vehicle area, The second converter is provided in the second vehicle area, The plurality of power supply distributors include: a first power supply distributor provided in the first vehicle area and configured to distribute the power supplied from the power supply line to a plurality of the electrical devices corresponding to the first vehicle area among the plurality of electrical devices; a second power supply distributor provided in the second vehicle area and configured to distribute the power supplied from the power supply line to a plurality of the electrical devices corresponding to the second vehicle area among the plurality of electrical devices; a third power supply distributor provided in the third vehicle area and configured to distribute the power supplied from the power supply line to a plurality of the electrical devices corresponding to the third vehicle area among the plurality of electrical devices; at least the third power supply distributor is capable of distributing the power supplied to the power supply line from both the first converter and the second converter to a plurality of the electrical devices corresponding to the third vehicle area; The first converter and the second converter are The output voltage is controlled based on the voltage information and the current information received from the first power distributor, the voltage information and the current information received from the second power distributor, and the voltage information and the current information received from the third power distributor, respectively.

3. The vehicle power supply system according to claim 2.

4. The second converter is A sub-power line different from the power line is connected to the plurality of power distributors and some of the plurality of electrical devices, and the power is supplied to each of the power distributors and some of the electrical devices via the sub-power line.

4. The vehicle power supply system according to claim 1.

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