Electronic component units and wire harnesses

Abstract

To provide an electronic component unit and a wire harness which can supply power properly to various apparatuses equipped in a vehicle.SOLUTION: An electronic component unit 10, which is applied to a wire harness, includes: a power source terminal 11 equipped in a vehicle and connected to a power source B2 for supplying power at a first voltage V1; a circuit branch part 13 connected to the power source terminal 11, the circuit branch part causing power supplied from the power source B2 to branch to a plurality of power source systems PL; and a voltage converter 15 removably provided to at least one of the power source systems PL in the circuit branch part 13, the voltage converter converting the voltage of power supplied from the power source B2 to a second voltage V2, which is lower than the first voltage V1, and outputting the second voltage V2.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an electronic component unit and a wire harness. [Background technology]

[0002] For example, Patent Document 1 discloses a wire harness for supplying power to various devices installed in a vehicle. This wire harness includes a power line connected to a single vehicle battery that outputs a predetermined first battery voltage, a power control box that receives the first battery voltage via the power line, supplies the received first battery voltage to a first device that operates on the first battery voltage, and reduces the received first battery voltage to a second battery voltage that is lower than the first battery voltage and supplies the second battery voltage to a second device that operates on the second battery voltage, a first supply line provided between the power control box and the first device for supplying the first battery voltage to the first device, and a second supply line provided between the power control box and the second device for supplying the second battery voltage to the second device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2016-222085 Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, this wire harness consolidates not only fuses, relays, branches, etc., but also a voltage conversion function within the power control box, thereby realizing power supply to each device in a situation where devices with different operating voltages are mixed. However, there is room for further improvement, for example, in terms of the placement of the voltage conversion function.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide an electronic component unit and a wire harness that can properly supply power to various devices mounted on a vehicle. [Means for solving the problem]

[0006] In order to achieve the above object, the electronic component unit of the present invention includes a power supply terminal connected to a power supply mounted on a vehicle and capable of supplying power at a first voltage, a circuit branching section connected to the power supply terminal and branching the power supplied from the power supply to a plurality of power supply systems, and a voltage converter in the circuit branching section that is detachably provided to at least one of the plurality of power supply systems and that converts the voltage of the power supplied from the power supply to a second voltage lower than the first voltage and outputs the second voltage.

[0007] In order to achieve the above object, a wire harness according to the present invention includes an electronic component unit mounted on a power source mounted on a vehicle and capable of supplying power at a first voltage, and a power supply line for supplying power from the electronic component unit to devices mounted on the vehicle, the electronic component unit including a power supply terminal connected to the power source, a circuit branching unit connected to the power supply terminal and branching the power supplied from the power source into a plurality of power supply systems, and a voltage converter in the circuit branching unit detachably attached to at least one of the plurality of power supply systems and configured to convert the voltage of the power supplied from the power source to a second voltage lower than the first voltage and output the converted power. Note that the power supply line may include a first power supply line for supplying the power output at the first voltage from the electronic component unit to a first device among the devices without passing through the voltage converter, and a second power supply line configured thicker than the first power supply line for supplying the power output at the second voltage from the electronic component unit via the voltage converter to a second device among the devices, different from the first device. [Effects of the Invention]

[0008] The electronic component unit and the wire harness according to the present invention have the effect of being able to supply power appropriately to various devices mounted on a vehicle. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic block diagram showing a general configuration of a power supply system to which a wire harness according to an embodiment is applied. [Figure 2] FIG. 2 is a schematic block diagram showing a general configuration of a vehicle to which the wire harness according to the embodiment is applied. [Figure 3] FIG. 3 is a perspective view showing a schematic configuration of a battery to which an electronic component unit according to the embodiment is assembled. [Figure 4] FIG. 4 is an exploded perspective view illustrating a schematic configuration of an electronic component unit according to the embodiment. [Figure 5] FIG. 5 is a perspective view illustrating a schematic configuration of an electronic component unit according to the embodiment. [Figure 6] FIG. 6 is a schematic circuit diagram illustrating a general configuration of an electronic component unit according to an embodiment. [Figure 7] FIG. 7 is a schematic perspective view illustrating a general configuration of a voltage converter of an electronic component unit according to an embodiment. [Figure 8] FIG. 8 is a perspective view illustrating a schematic configuration of another aspect of the electronic component unit according to the embodiment. [Figure 9] FIG. 9 is a schematic circuit diagram illustrating a schematic configuration of another aspect of the electronic component unit according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially the same.

[0011] [Embodiment] The wire harness WH according to this embodiment shown in FIGS. 1 and 2 is applied to a power supply system Sys mounted on a vehicle V. The power supply system Sys is a system that supplies power to various devices D mounted on the vehicle V. The devices D are load devices that perform various functions in the vehicle V by being operated and driven by the power supplied from the power supply system Sys. The devices D include, for example, driving system actuators (motor generators, steering devices, braking devices, etc.), body system devices (lighting devices, air conditioning devices, wiper devices, power mirrors, power seats, power doors, etc.), multimedia system devices (navigation devices, audio devices, meters, displays, etc.), detection system devices (sensors, cameras, radar, etc.), communication devices, electronic control units (ECUs), etc.

[0012] In recent years, with the diversification of power sources in vehicles V, there has been an increasing need to install devices D with different drive voltages in the vehicle V. Against this background, the power supply system Sys is required to properly supply power to multiple devices D with different drive voltages.

[0013] As described above, the wire harness WH of this embodiment is configured to be able to supply power appropriately to various devices D mounted on a vehicle V in a situation where devices D with different drive voltages are mixed. Hereinafter, each configuration of the wire harness WH, etc. will be described in detail with reference to the respective drawings.

[0014] In the following description, the device D will be described as including a plurality of devices D with different drive voltages, including a first device D1 driven by a first voltage V1 and a second device D2 driven by a second voltage V2. The first voltage V1 is, for example, a voltage between 30V and 60V. On the other hand, the second voltage V2 is a voltage lower than the first voltage V1, for example, a voltage greater than 0V and less than 30V. As an example, the first voltage V1 will be described as "48V" and the second voltage V2 as "12V." That is, the first device D1 will be described as a 48V-driven device driven by a 48V voltage, and the second device D2 will be described as a 12V-driven device driven by a 12V voltage. In the following description, when there is no need to particularly distinguish between the first device D1 and the second device D2, they may be simply referred to as "device D."

[0015] Specifically, as shown in Figures 1 and 2, the power supply system Sys includes a high-voltage battery B1 and a 48V battery B2 that serve as power sources, and a wire harness WH that electrically connects these to each device D. Note that Figure 2 does not show the high-voltage battery B1 for ease of understanding.

[0016] The high-voltage battery B1 is a battery that stores power at a predetermined high voltage and is a first power source that can supply power at the predetermined high voltage. The high-voltage battery B1 typically has a higher voltage (battery voltage) than the 48V battery B2, for example, a voltage of approximately 300V to 400V. In this embodiment, the high-voltage battery B1 is electrically connected to the 48V battery B2 via a DC / DC converter B1A and supplies power to the 48V battery B2. The DC / DC converter B1A is a transformer that converts the voltage of DC power. The DC / DC converter B1A is electrically connected to the 48V battery B2 and converts the voltage of the power from the high-voltage battery B1 to a first voltage V1 and outputs it to the 48V battery B2. In this example, the first voltage V1 is "48V." In other words, the DC / DC converter B1A steps down the voltage of the high-voltage battery B1 to 48V, which corresponds to the first voltage V1, and outputs it to the 48V battery B2. The high-voltage battery B1 is also electrically connected to other devices (not shown) and supplies power to these devices (not shown).

[0017] The 48V battery B2 is a battery that stores power at a first voltage V1 that is lower than the voltage of the high-voltage battery B1, and is a second power supply that can supply power at the first voltage V1. As described above, the first voltage V1 is 48V, i.e., the 48V battery B2 has a voltage (battery voltage) of approximately 48V. The 48V battery B2 is electrically connected to the high-voltage battery B1 via a DC / DC converter B1A and can be charged with power supplied from the high-voltage battery B1 via the DC / DC converter B1A. Note that the 48V battery B2 is not limited to being charged by the high-voltage battery B1, and may be charged with power generated by, for example, a 48V generator (48V alternator) (not shown). The 48V battery B2 is electrically connected to each device D via a wire harness WH and supplies power to each device D via the wire harness WH. In this embodiment, the 48V battery B2 serves as a power source that supplies power to both the first device D1 and the second device D2 via the wire harness WH.

[0018] The wire harness WH constitutes a power supply system PL that supplies power from a 48V battery B2, which is a power source, to each device D. The wire harness WH of this embodiment has a voltage conversion function that converts the voltage of the power supplied from the 48V battery B2 into a second voltage V2 that is lower than the first voltage V1 and outputs the second voltage V2, thereby appropriately supplying power to the first device D1 and the second device D2, which have different drive voltages.

[0019] Specifically, the wire harness WH of this embodiment includes an electronic component unit 10, a power supply line 20, a 48V power distribution box 30, and a 12V power distribution box 40, and the electronic component unit 10 is provided with a voltage conversion function.

[0020] The electronic component unit 10 is a unit directly connected to a 48V battery B2, which is a power source, and is sometimes called a BFT (Battery Fuse Terminal). In addition to a circuit branching function and a circuit protection function, the electronic component unit 10 of this embodiment also has a voltage conversion function for outputting 12V. With this configuration, the electronic component unit 10 realizes power distribution to a first device D1, which is a 48V-driven device, as well as power distribution to a second device D2, which is a 12V-driven device.

[0021] Here, the 48V battery B2 on which the electronic component unit 10 is mounted includes a battery housing B2a and a battery post B2b, as shown in FIGS. 3 and 4. The battery housing B2a is formed in a generally rectangular parallelepiped shape overall and houses battery fluid and various components therein. The battery post B2b protrudes from the top surface of the battery housing B2a. The battery post B2b is formed in a generally cylindrical shape from conductive lead or the like. The battery posts B2b are provided in pair with a gap between them on the top surface of the battery housing B2a, one of which constitutes an anode and the other a cathode. The electronic component unit 10 of this embodiment is assembled to the battery post B2b on the anode side.

[0022] Specifically, as shown in Figures 3, 4, 5, and 6, the electronic component unit 10 includes a battery terminal 11 as a power supply terminal and a unit main body 12, and is electrically connected to the positive side battery post B2b via the battery terminal 11.

[0023] The battery terminal 11 is a connection terminal made of a conductive metal material, and is interposed between the battery post B2b and the unit body 12 to electrically connect them. The battery terminal 11 has a fastening portion 11a, a stud bolt 11b, and a nut 11c. The fastening portion 11a of the battery terminal 11 is fastened to the battery post B2b, and the unit body 12 is fastened to the stud bolt 11b via the nut 11c. As a result, the battery terminal 11 is electrically connected to the 48V battery B2 and the unit body 12, electrically connecting them.

[0024] The unit body 12 includes a base portion 12A and a hanging portion 12B, and is formed so that the base portion 12A and the hanging portion 12B intersect at a bent portion, thereby forming a generally L-shaped overall configuration. The base portion 12A is located on the upper surface of the battery housing B2a on which the battery posts B2b are provided, and is positioned along this upper surface. The hanging portion 12B is provided to protrude from the base portion 12A via the bent portion so as to hang down along the side surface of the battery housing B2a.

[0025] The unit body 12 of this embodiment includes a circuit branching section 13 that realizes a circuit branching function, a circuit protector 14 that realizes a circuit protection function, and a voltage converter 15 that realizes a voltage conversion function for producing a 12V output.

[0026] The circuit branching unit 13 is connected to the battery terminals 11 and branches the power supplied from the 48V battery B2 into multiple power supply systems PL. Here, the multiple power supply systems PL branched by the circuit branching unit 13 include multiple 48V power supply systems PL1 and at least one 12V power supply system PL2. The 48V power supply system PL1 is a power supply system PL that supplies a 48V voltage corresponding to a first voltage V1 to a first device D1, which is a 48V-powered device. On the other hand, the 12V power supply system PL2 is a power supply system PL that supplies a 12V voltage corresponding to a second voltage V2 to a second device D2, which is a 12V-powered device. The circuit branching unit 13 branches the power supplied from the 48V battery B2 into the multiple 48V power supply systems PL1 and at least one 12V power supply system PL2.

[0027] Circuit branch portion 13 is configured by, for example, a metal bus bar. A metal bus bar is a plate-shaped conductor made of a conductive metal material. Circuit branch portion 13 is configured by the metal bus bar as a bus bar circuit having a branch portion. Circuit branch portion 13 is embedded and protected inside resin housing 16 (see FIG. 5) by, for example, insert molding or the like. Circuit branch portion 13 is formed by bending via a bend so as to straddle base portion 12A and hanging portion 12B.

[0028] The circuit branch portion 13 is embedded inside the housing 16, with a portion of the portion located at the base portion 12A exposed, and a fastening hole 13a is formed in the exposed portion. The circuit branch portion 13 is fastened to the battery terminal 11 by inserting the above-mentioned stud bolt 11b into the fastening hole 13a and screwing in the nut 11c, thereby electrically connecting and establishing conduction with the battery terminal 11. As a result, the circuit branch portion 13 is established in conduction with the 48V battery B2 via the battery terminal 11, and power is supplied and input from the 48V battery B2 at the first voltage V1, i.e., 48V.

[0029] Circuit branching unit 13 configures a circuit branched in accordance with the number of power supply systems PL, and branches the power supplied from 48V battery B2 into the plurality of power supply systems PL. Ends of the branched circuits of circuit branching unit 13 are electrically connected via connectors or the like to power supply lines 20 constituting each power supply system PL at output terminal unit 17 (see FIG. 5) located at the end of hanging portion 12B of unit body 12, and output the branched power to each power supply line 20.

[0030] The circuit branch portion 13 is also connected to, for example, stud bolts 18, 19, and is embedded and integrated with the housing 16 together with the stud bolts 18, 19. For example, the stud bolts 18, 19 are fastened together with the circuit branch portion 13 to connection terminals, etc., and are electrically connected to the above-mentioned 48V generator (48V alternator) and other devices via the connection terminals, etc.

[0031] The circuit protectors 14 are provided in the power supply systems PL at the circuit branching section 13 and protect the power supply systems PL by interrupting current when an overcurrent flows through the power supply systems PL. Here, the circuit protectors 14 are provided for each of the multiple power supply systems PL at the circuit branching section 13. The circuit protectors 14 are typically configured with fusible elements, such as fuses or fusible links, that melt and interrupt the current path when an overcurrent flows. The circuit protectors 14 are incorporated into the circuits constituting each power supply system PL at the circuit branching section 13. Here, an overcurrent is, for example, a current greater than or equal to a predetermined rated current. That is, the fusible elements melt when a current greater than or equal to the predetermined rated current flows. The rated current is determined according to the current of the circuit to be protected. Typically, fusible elements with different capacities are used for the 48V power supply system PL1 and the 12V power supply system PL2. The circuit protectors 14 are not limited to fusible elements, and may be, for example, protective breakers configured with semiconductor relays or the like.

[0032] The voltage converter 15 is provided in at least one of the power supply systems PL in the circuit branch section 13, and converts the voltage of the power supplied from the 48V battery B2 to a second voltage V2 lower than the first voltage V1 and outputs the converted voltage. This allows the electronic component unit 10 of this embodiment to output not only the first voltage V1 corresponding to the battery voltage of the 48V battery B2, but also the second voltage V2 lower than the first voltage V1. The voltage converter 15 is provided in the 12V power supply system PL2 of the power supply systems PL in the circuit branch section 13, and converts the 48V voltage corresponding to the first voltage V1 down to 12V voltage corresponding to the second voltage V2 and outputs the converted voltage to the 12V power supply system PL2.

[0033] Voltage converter 15 is typically configured as a DC / DC converter that converts the voltage of DC power. Voltage converter 15 of this embodiment is configured to be detachably attached to 12V power supply system PL2 in circuit branch unit 13, for example, by housing converter main body 15A, which includes electronic components mounted on a board, in housing 15B and modularizing connection terminals 15C protruding from housing 15B, as shown in FIG. 7 . With this configuration, voltage converter 15 is detachably attached to circuit branch unit 13 by inserting connection terminals 15C into a portion of circuit branch unit 13 that constitutes 12V power supply system PL2. In the 12V power supply system PL2, circuit protector 14 may be located upstream of voltage converter 15 (on the 48V battery B2 side) and integrated with voltage converter 15, or may be located downstream of voltage converter 15 (on the second device D2 side) and integrated with voltage converter 15. As a result, the circuit protector 14 may be provided in the circuit branch section 13 so as to be detachable from the 12V power supply system PL2 together with the voltage converter 15.

[0034] The electronic component unit 10 configured as described above outputs a portion of the power input from the 48V battery B2 via the battery terminal 11 to the circuit branch 13 to each 48V power supply system PL1 at a first voltage V1 equivalent to the battery voltage without transforming it, while the remaining portion is stepped down to a second voltage V2 by the voltage converter 15 and output to the 12V power supply system PL2. As a result, the electronic component unit 10 outputs power at 48V equivalent to the first voltage V1 to the first device D1, which is a 48V-driven device, and at 12V equivalent to the second voltage V2 to the second device D2, which is a 12V-driven device. At this time, the electronic component unit 10 protects each power supply system PL by interposing a circuit protector 14 in each power supply system PL at the circuit branch 13.

[0035] As shown in FIGS. 1 , 2 , 5 , and 6 , the power supply line 20 is a wiring member that is interposed between the electronic component unit 10 and the device D and supplies power from the electronic component unit 10 to the device D. In other words, the power supply line 20 constitutes a power supply system PL that supplies power to the device D. The power supply line 20 is typically constituted by a general electric wire, but may also be constituted by a planar circuit body such as an FPC (Flexible Printed Circuits) or an FFC (Flexible Flat Cable). The power supply line 20 of this embodiment is constituted by including a first power supply line 21 and a second power supply line 22.

[0036] The first power supply line 21 is the power supply line 20 that constitutes the 48V power supply system PL1 of the power supply system PL. The first power supply line 21 is provided between the output terminal unit 17 of the electronic component unit 10 and each first device D1, and a 48V power distribution box 30 (described later) is provided on this first power supply line 21. The first power supply line 21 supplies power output from the electronic component unit 10 at a voltage of 48V corresponding to the first voltage V1 without passing through the voltage converter 15 to the first device D1, which is a 48V-driven device.

[0037] The second power supply line 22 is the power supply line 20 that constitutes the 12V power supply system PL2 of the power supply system PL. The second power supply line 22 is provided between the output terminal unit 17 of the electronic component unit 10 and each second device D2, and a 12V power distribution box 40 (described later) is provided on this second power supply line 22. The second power supply line 22 supplies power output from the electronic component unit 10 via the voltage converter 15 at 12V, which corresponds to the second voltage V2, to the second device D2, which is a 12V-driven device.

[0038] In addition, in a transitional period in which the first device D1, which is a 48V-driven device, and the second device D2, which is a 12V-driven device, are mixed in the vehicle V, the power supply lines 20 configured as described above typically tend to be configured such that the first power supply line 21 configuring the 48V power supply system PL1, which has a relatively high voltage, is relatively thin, and the second power supply line 22 configuring the 12V power supply system PL2, which has a relatively low voltage, is relatively thick. However, the power supply lines 20 are not limited to this.

[0039] As shown in FIGS. 1 and 2, the 48V power distribution box 30 is interposed between the electronic component unit 10 and the first devices D1 and distributes power supplied from a 48V battery B2 to the multiple first devices D1. The 48V power distribution box 30 is configured to include electronic components such as branches, fuses (circuit protectors), and relays, which work together to distribute power to the multiple first devices D1. The 48V power distribution box 30 is provided on a first power supply line 21 that constitutes a 48V power supply system PL1 of the power supply system PL, and distributes power that is output at a voltage of 48V equivalent to the first voltage V1 without being stepped down by the electronic component unit 10 to the multiple first devices D1, which are 48V-driven devices. The first power supply line 21 branches at the output side of the 48V power distribution box 30 into a number of lines corresponding to the number of first devices D1 to which power is distributed from the 48V power distribution box 30. In the example of FIG. 2, a total of three 48V power distribution boxes 30 are shown.

[0040] As shown in FIGS. 1 and 2 , the 12V power distribution box 40 is interposed between the electronic component unit 10 and the second devices D2 and distributes power supplied from the 48V battery B2 to the plurality of second devices D2. Like the 48V power distribution box 30, the 12V power distribution box 40 includes electronic components such as branches, fuses (circuit protectors), and relays, which work together to distribute power to the plurality of second devices D2. The 12V power distribution box 40 is provided on the second power supply line 22 that constitutes the 12V power system PL2 of the power system PL. The 12V power distribution box 40 distributes power that is stepped down by the voltage converter 15 in the electronic component unit 10 and output at 12V, which corresponds to the second voltage V2, to the plurality of second devices D2, which are 12V-powered devices. The second power supply line 22 branches at the output side of the 12V power distribution box 40 into a number of lines corresponding to the number of second devices D2 to which power is distributed from the 12V power distribution box 40. In the example of FIG. 2, one 12V power distribution box 40 is shown in total.

[0041] The wire harness WH and electronic component unit 10 described above can output a portion of the power input from the 48V battery B2 via the battery terminal 11 to the circuit branch 13 to each 48V power supply system PL1 at a first voltage V1 equivalent to the battery voltage without transforming it. Meanwhile, the wire harness WH and electronic component unit 10 can step down the remaining portion of the power input from the 48V battery B2 via the battery terminal 11 to a second voltage V2 using the voltage converter 15 and output the remaining portion to the 12V power supply system PL2. This allows the electronic component unit 10 to output power at 48V equivalent to the first voltage V1 to the first device D1, which is a 48V-driven device, and at 12V equivalent to the second voltage V2 lower than the first voltage V1 to the second device D2, which is a 12V-driven device. As a result, the wire harness WH and the electronic component unit 10 can appropriately distribute and supply power to the first device D1 and the second device D2, which have different drive voltages.

[0042] In this case, the wire harness WH is arranged such that the electronic component unit 10, which has a voltage conversion function for transforming a first voltage V1 corresponding to the battery voltage of the 48V battery B2 into a second voltage V2 and outputting the voltage, is provided directly on the 48V battery B2. With this arrangement, the wire harness WH and the electronic component unit 10 can improve the wiring efficiency by shortening the wiring length of the second power supply line 22, which tends to have a relatively large wire diameter and a large weight, as much as possible when, for example, second devices D2 driven by the second voltage V2 are concentrated near the 48V battery B2, and as a result, the weight of the wire harness WH as a whole can be suppressed.

[0043] Furthermore, the wire harness WH and electronic component unit 10 are configured such that the voltage converter 15 is detachable from the power supply system PL at the circuit branch portion 13. With this configuration, the voltage converter 15 can be appropriately changed or added to the wire harness WH and electronic component unit 10 to suit the required performance, for example, when a new device D is added during use, as there is a trend toward using the vehicle V for a longer period of time in order to achieve carbon neutrality, etc. As a result, the wire harness WH and electronic component unit 10 can easily ensure the required voltage output and capacity, for example, without having to replace the entire electronic component unit 10 with a different one, by selecting a voltage converter 15 and assembling it to the electronic component unit 10 in accordance with the addition or update of a device D to be mounted on the vehicle V, for example, and this configuration can easily accommodate specification changes, for example. Furthermore, by providing each power supply system PL with a structure that allows a voltage converter 15 to be attached or detached at the circuit branch 13, the wire harness WH and the electronic component unit 10 can arbitrarily increase the number of outputs of the second voltage V2 that is lower than the first voltage V1, which is the battery voltage, depending on the situation, as shown in Figures 8 and 9. The number of outputs of the second voltage V2 is one in the embodiments shown in Figures 5 and 6, but is two in the embodiments shown in Figures 8 and 9.

[0044] As described above, the wire harness WH and the electronic component unit 10 can properly supply power to various devices D mounted on the vehicle V, even in a situation where devices D with different drive voltages are mixed.

[0045] Furthermore, the wire harness WH and electronic component unit 10 described above can protect the power supply system PL by providing a circuit protector 14 in each power supply system PL at the circuit branch 13 of the electronic component unit 10, so that the circuit protector 14 cuts off when an overcurrent flows through the power supply system PL. In this case, the wire harness WH and electronic component unit 10 are configured so that the circuit protector 14 is detachable from the power supply system PL at the circuit branch 13, just like the voltage converter 15, and this also makes it easy to accommodate specification changes, etc.

[0046] The electronic component unit and the wire harness according to the above-described embodiment of the present invention are not limited to the above-described embodiment, and various modifications are possible within the scope of the claims.

[0047] In the above description, the electronic component unit 10 has been described as having a circuit protection function in addition to a circuit branching function and a voltage conversion function, but this is not limited to this. That is, the electronic component unit 10 does not include the circuit protector 14, and for example, the circuit protector may be provided at a different location on each power supply system PL.

[0048] In the above description, the circuit branching unit 13 is described as branching the power supplied from the 48V battery B2 into multiple 48V power supply systems PL1 and one 12V power supply system PL2, but this is not limiting and there may be two or more 12V power supply systems PL2 as described above. In this case, the electronic component unit 10 is provided with a voltage converter 15 for each 12V power supply system PL2 in the circuit branching unit 13.

[0049] In the above explanation, the power supply terminal 11 and the unit main body 12 are described as being configured separately, but this is not limited to this. The power supply terminal 11 and the unit main body 12 may be configured as a single unit, and for example, the power supply terminal 11 and the circuit branch portion 13 may be connected as a single unit.

[0050] The electronic component unit and the wire harness according to this embodiment may be configured by appropriately combining the components of the above-described embodiments and modified examples.

[0051] The wire harness WH and electronic component unit 10 described above have been described as being capable of appropriately changing or adding voltage converter 15 to suit the required performance, for example, when a new device D is added during use. In this regard, as a reference example, the wire harness and electronic component unit may be configured such that the voltage converter 15 is removed in cases where it becomes unnecessary later, for example. [Explanation of symbols]

[0052] 10 Electronic Components Unit 11 Battery terminal (power terminal) 13 Circuit branch 14 Circuit protector 15 Voltage converter 15A converter body 15B case 15C connection terminal 20 Power supply line 21 1st power supply line 22 2nd power supply line B2 48V battery (power supply) D equipment D1 1st device D2 2nd device PL power system PL1 48V power system PL2 12V power system Sys Power System V vehicle V1 First voltage V2 Second voltage WH Wire Harness

Claims

1. a power supply terminal connected to a power supply mounted on the vehicle and capable of supplying power at a first voltage; a circuit branching unit connected to the power supply terminal and branching the power supplied from the power supply into a plurality of power supply systems; a voltage converter that is detachably provided in the circuit branch unit with respect to at least one of the plurality of power supply systems and that converts a voltage of the power supplied from the power supply into a second voltage that is lower than the first voltage and outputs the second voltage; the power supply terminals are fastened to battery posts of the power supply; the circuit branch portion is fastened to a stud bolt of the power terminal; the voltage converter is detachably attached to the circuit branch section; Electronic component unit.

2. the circuit branch section is provided with a circuit protector that is detachably attached to the power supply system and that cuts off the power supply system to protect it when an overcurrent flows through the power supply system; The electronic component unit according to claim 1 .

3. an electronic component unit provided on a power source mounted on the vehicle and capable of supplying power at a first voltage; a power supply line that supplies power from the electronic component unit to devices mounted on the vehicle, The electronic component unit includes a power supply terminal connected to the power supply; a circuit branching unit connected to the power supply terminal and branching the power supplied from the power supply into a plurality of power supply systems; a voltage converter that is detachably provided in the circuit branch unit with respect to at least one of the plurality of power supply systems and that converts a voltage of the power supplied from the power supply into a second voltage that is lower than the first voltage and outputs the second voltage; the power supply terminals are fastened to battery posts of the power supply; the circuit branch portion is fastened to a stud bolt of the power terminal; the voltage converter is detachably attached to the circuit branch section; Wire harness.

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