Electronic component unit and wire harness

Abstract

The purpose of the present invention is to provide an electronic component unit and a wire harness capable of appropriately supplying power to various devices mounted on a vehicle. An electronic component unit (10) applied to a wire harness is provided with: a power supply terminal (11) connected to a power supply (B2) mounted on a vehicle and capable of supplying power at a first voltage (V1); a circuit branching unit (13) that is connected to the power supply terminal (11) and branches power supplied from the power supply (B2) to a plurality of power supply systems (PL); and a voltage converter (15) that is detachably provided to at least one power supply system (PL) among the plurality of power supply systems (PL) in the circuit branching unit (13), converts the voltage of the power supplied from the power supply (B2) to a second voltage (V2) that is lower than the first voltage (V1), and outputs the second voltage (V2).

Description

Technical Field

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

[0002] For example, Patent Document 1 discloses a wiring harness for supplying power to various devices installed in a vehicle. The wiring 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 at the first battery voltage, and steps down the received first battery voltage to a second battery voltage lower than the first battery voltage, and supplies the second battery voltage to a second device that operates at the second battery voltage; a first supply line provided between the power control box and the first device, and used to supply the first battery voltage to the first device; and a second supply line provided between the power control box and the second device, and used to supply the second battery voltage to the second device.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-222085 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In addition, the wiring harness integrates a voltage conversion function in addition to fuses, relays, branches, etc. in the power control box, thereby achieving 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 the configuration of the voltage conversion function.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic component unit and a wiring harness capable of appropriately supplying electric power to various devices mounted on a vehicle.

[0009] Means for solving problems

[0010] In order to achieve the above-mentioned purpose, the electronic component unit involved in the present invention comprises: a power terminal, which is connected to a power supply, and the power supply is installed in a vehicle and can supply power at a first voltage; a circuit branch part, which is connected to the power terminal so that the power supplied from the power supply is branched to multiple power supply systems; and a voltage converter, which is arranged in the circuit branch part so that it can be loaded and unloaded relative to at least one of the multiple power supply systems, and converts the voltage of the power supplied from the power supply into a second voltage lower than the first voltage and outputs it.

[0011] In order to achieve the above object, the wiring harness of the present invention comprises: an electronic component unit, the electronic component unit is provided in a power supply, the power supply is mounted on a vehicle and can supply power at a first voltage; and a power supply line, the power supply line supplies power from the electronic component unit to a device mounted on the vehicle, the electronic component unit having: a power supply terminal, the power supply terminal is connected to the power supply; a circuit branching part, the circuit branching part is connected to the power supply terminal, and the power supplied from the power supply is branched to a plurality of power supply systems; and a voltage converter, the voltage converter is detachably provided in the circuit branching part relative to at least one of the plurality of power supply systems, and the voltage of the power supplied from the power supply is converted into a second voltage lower than the first voltage and outputted. In addition, the power supply line sometimes includes: a first power supply line, the first power supply line supplies the power outputted from the electronic component unit at the first voltage to a first device among the devices without passing through the voltage converter; and a second power supply line, the second power supply line is configured to be thicker than the first power supply line, and the power outputted from the electronic component unit at the second voltage is supplied to a second device among the devices different from the first device through the voltage converter.

[0012] Effects of the Invention

[0013] The electronic component unit and the wiring harness according to the present invention have the effect of being able to appropriately supply electric power to various devices mounted on a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic block diagram showing a schematic configuration of a power supply system to which a wire harness according to the embodiment is applied.

[0015] Figure 2 This is a schematic block diagram showing a schematic structure of a vehicle to which the wire harness according to the embodiment is applied.

[0016] Figure 3 It is a perspective view showing a schematic structure of a battery in which the electronic component unit according to the embodiment is incorporated.

[0017] Figure 4 It is an exploded perspective view showing a schematic structure of the electronic component unit according to the embodiment.

[0018] Figure 5 It is a perspective view showing a schematic structure of an electronic component unit according to the embodiment.

[0019] Figure 6 It is a schematic circuit diagram showing a schematic configuration of an electronic component unit according to the embodiment.

[0020] Figure 7 It is a schematic perspective view showing a schematic structure of a voltage converter of the electronic component unit according to the embodiment.

[0021] Figure 8 It is a perspective view showing a schematic structure of another form of the electronic component unit according to the embodiment.

[0022] Fig. 9 This is a schematic circuit diagram showing a schematic structure of another form of the electronic component unit according to the embodiment.

[0023] Description of Reference Numerals

[0024] 10 Electronic component unit

[0025] 11Battery terminal (power terminal)

[0026] 13 Circuit branch

[0027] 14 Circuit protector

[0028] 15 Voltage Converter

[0029] 15A Converter Body

[0030] 15B Frame

[0031] 15C Connector Terminal

[0032] 20 Power supply lines

[0033] 21 First power supply line

[0034] 22 Second power supply line

[0035] B2 48V battery (power supply)

[0036] D Device

[0037] D1 First Equipment

[0038] D2 Second Device

[0039] PL Power System

[0040] PL1 48V power supply system

[0041] PL2 12V Power System

[0042] Sys Power System

[0043] V Vehicle

[0044] V1 First voltage

[0045] V2 Second voltage

[0046] WH Harness DETAILED DESCRIPTION

[0047] Hereinafter, the embodiments of the present invention will be described in detail based on the accompanying drawings. In addition, the present invention is not limited to the embodiments. In addition, the constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

[0048] [Implementation Method]

[0049] Figure 1 , Figure 2 The wiring harness WH involved in the present embodiment shown is suitable for 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 device D is a load device that performs various functions in the vehicle V by operating and driving using the power supplied from the power supply system Sys. The device D is, for example, a travel system actuator (electric generator, steering device, brake device, etc.), a body system device (lighting equipment, air conditioning equipment, wiper equipment, electric mirrors, electric seats, electric doors, etc.), a multimedia system device (navigation device, audio, instrument, display, etc.), a detection system device (sensor, camera, radar, etc.), a communication device, an electronic control unit (ECU; Electronic Control Unit), etc.

[0050] In recent years, as power sources in the vehicle V have become more diverse, there has been an increasing demand for mixing devices D having different drive voltages and mounting them in the vehicle V. Under such circumstances, the power supply system Sys is required to appropriately supply power to a plurality of devices D having different drive voltages.

[0051] As described above, the wire harness WH of the present embodiment realizes a configuration that can appropriately supply power to various devices D mounted on the vehicle V when devices D having different driving voltages coexist. Hereinafter, each configuration of the wire harness WH and the like will be described in detail with reference to the drawings.

[0052] In addition, in the following description, the following case is used for description: the device D is configured to include a first device D1 driven by a first voltage V1 and a second device D2 driven by a second voltage V2 as a plurality of devices D having different driving voltages. The first voltage V1 is, for example, a voltage greater than 30V and less than 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. Here, as an example, the first voltage V1 is set to "48V" and the second voltage V2 is set to "12V" for description. That is, here, the first device D1 is set to be a 48V driving device driven by a voltage of 48V, and the second device D2 is set to be a 12V driving device driven by a voltage of 12V for description. In addition, below, when there is no need to specifically distinguish between the first device D1 and the second device D2 for description, it is sometimes simply referred to as "device D".

[0053] Specifically, if Figure 1 , Figure 2 As shown, the power supply system Sys includes a high voltage battery B1 and a 48V battery B2 as power supplies, and a wiring harness WH that electrically connects them to each device D. In addition, Figure 2 In order to facilitate understanding of the drawings, illustration of the high-voltage battery B1 is omitted.

[0054] The high-voltage battery B1 is a battery that stores electric power at a predetermined high voltage, and is a first power source that can supply electric power at the predetermined high voltage. Typically, the voltage of the high-voltage battery B1 is higher than that of the 48V battery B2, for example, a voltage of about 300V to 400V (battery voltage). The high-voltage battery B1 of the present embodiment is electrically connected to the 48V battery B2 via a DC / DC converter B1A, and supplies electric power to the 48V battery B2. The DC / DC converter B1A is a transformer that converts the voltage of direct current power. The DC / DC converter B1A is electrically connected to the 48V battery B2, converts the voltage of the electric power from the high-voltage battery B1 into a first voltage V1, and outputs it to the 48V battery B2. Here, the first voltage V1 is "48V", that is, the DC / DC converter B1A steps down the voltage of the high-voltage battery B1 to a voltage of 48V equivalent to the first voltage V1 and outputs it to the 48V battery B2. In addition, the high-voltage battery B1 is also electrically connected to a device not shown in the figure, and also supplies electric power to the device not shown in the figure.

[0055] The 48V battery B2 is a battery that stores electric power at a first voltage V1 that is lower than the voltage of the high-voltage battery B1, and is a second power source that can supply electric power at the first voltage V1. As described above, here, the first voltage V1 is "48V", that is, the 48V battery B2 is a voltage of about 48V (battery voltage). The 48V battery B2 is electrically connected to the high-voltage battery B1 via the DC / DC converter B1A, and can be charged using the electric power supplied from the high-voltage battery B1 via the DC / DC converter B1A. In addition, the 48V battery B2 is not limited to being charged using the high-voltage battery B1, and can also be charged using the electric power generated by a 48V generator (48V AC generator) not shown in the figure, etc. The 48V battery B2 is electrically connected to each device D via the wiring harness WH, and supplies electric power to each device D via the wiring harness WH. The 48V battery B2 of this embodiment becomes a power source that supplies electric power to both the first device D1 and the second device D2 via the wiring harness WH.

[0056] The wiring harness WH constitutes a power supply system PL that supplies power from a 48V battery B2 as a power supply to each device D. The wiring 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 lower than the first voltage V1 and outputs it, thereby appropriately supplying power to the first device D1 and the second device D2 having different driving voltages.

[0057] Specifically, the wire harness WH of the present 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.

[0058] The electronic component unit 10 is a unit directly connected to the 48V battery B2 as a power source, and is sometimes referred to as a BFT (Battery Fuse Terminal). The electronic component unit 10 of this embodiment has a voltage conversion function for 12V output in addition to a circuit branching function and a circuit protection function. According to this structure, the electronic component unit 10 realizes power distribution to the second device D2 as a 12V drive device in addition to realizing power distribution to the first device D1 as a 48V drive device.

[0059] Here, if Figure 3 , Figure 4As shown, the 48V battery B2 provided with the electronic component unit 10 is constructed to include a battery frame B2a and a battery post B2b. The battery frame B2a is formed as a whole in a roughly rectangular parallelepiped shape, and contains battery fluid and various components inside. The battery post B2b is provided protruding from the upper surface of the battery frame B2a. The battery post B2b is formed into a roughly cylindrical shape by conductive lead or the like. A pair of battery posts B2b are provided at intervals on the upper surface of the battery frame B2a, one constituting an anode and the other constituting a cathode. The electronic component unit 10 of this embodiment is assembled to the battery post B2b on the anode side.

[0060] Specifically, if Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the electronic component unit 10 includes a battery terminal 11 as a power supply terminal and a unit body 12 , and is electrically connected to the battery post B2 b on the positive electrode side via the battery terminal 11 .

[0061] The battery terminal 11 is a connection terminal formed of a conductive metal material, which is interposed between the battery post B2b and the unit body 12 and electrically connected to each other. 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, and the two are electrically connected.

[0062] The unit body 12 is configured to include a base portion 12A and a hanging portion 12B, and the base portion 12A and the hanging portion 12B are formed to intersect via a curved portion, thereby forming a generally L-shaped shape as a whole. The base portion 12A is located on the upper surface of the battery frame B2a where the battery pole B2b is provided, and is provided along the upper surface. The hanging portion 12B is provided to protrude from the base portion 12A via a curved portion and hangs down along the side of the battery frame B2a.

[0063] The unit body 12 of the present embodiment includes a circuit branching portion 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 performing a 12V output.

[0064] The circuit branching section 13 is connected to the battery terminal 11, and branches the power supplied from the 48V battery B2 to a plurality of power supply systems PL. Here, the plurality of power supply systems PL branched by the circuit branching section 13 include a plurality of 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 equivalent to a first voltage V1 to a first device D1 that is a 48V driving device. On the other hand, the 12V power supply system PL2 is a power supply system PL that supplies a 12V voltage equivalent to a second voltage V2 to a second device D2 that is a 12V driving device. The circuit branching section 13 branches the power supplied from the 48V battery B2 to a plurality of 48V power supply systems PL1 and at least one 12V power supply system PL2.

[0065] The circuit branching portion 13 is formed of, for example, a metal bus bar. A metal bus bar is a plate-shaped conductor formed of a conductive metal material. The circuit branching portion 13 is formed of a metal bus bar to form a bus bar circuit having a branching portion. The circuit branching portion 13 is embedded in a resin housing 16 (see FIG. 1 ) by, for example, insert molding or the like. Figure 5 The circuit branch portion 13 is formed by bending the bent portion in a manner spanning the base portion 12A and the hanging portion 12B.

[0066] The circuit branch portion 13 is embedded in the housing 16, with a portion of the base portion 12A exposed, and a fastening hole 13a is formed in the exposed portion. The stud bolt 11b is inserted into the fastening hole 13a and screwed with the nut 11c, so that the circuit branch portion 13 is fastened to the battery terminal 11, and is electrically connected and conducted with the battery terminal 11. As a result, the circuit branch portion 13 is conducted 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.

[0067] The circuit branching unit 13 forms a circuit that branches according to the number of power supply systems PL, so that the power supplied from the 48V battery B2 is branched to a plurality of power supply systems PL. The circuit branching unit 13 is provided at an output terminal 17 (see Figure 5 ) in which the ends of the branched circuits are electrically connected to the power supply lines 20 constituting each power supply system PL via connectors, etc., and the branched power is output to the power supply lines 20.

[0068] In addition, the circuit branching portion 13 is connected to stud bolts 18, 19, etc., and is integrated with the stud bolts 18, 19 and buried in the housing 16. The stud bolts 18, 19 are fastened with connection terminals together with the circuit branching portion 13, and are electrically connected to the above-mentioned 48V generator (48V AC generator) or other devices through the connection terminals.

[0069] The circuit protector 14 is provided in the power supply system PL in the circuit branch 13, and is cut off when an overcurrent flows through the power supply system PL to protect the power supply system PL. Here, the circuit protector 14 is provided for each of the plurality of power supply systems PL in the circuit branch 13. The circuit protector 14 is typically composed of a fusible element such as a fuse or a fusible link that melts and cuts off the current path when an overcurrent flows, and is assembled into the circuit constituting each power supply system PL in the circuit branch 13. Here, the overcurrent is, for example, a current above a preset rated value. That is, the fusible element melts when a current above a preset rated value flows. The rated current is determined according to the current of the circuit to be protected. Typically, the fusible element constituting the circuit protector 14 uses fusible elements of different capacities in the 48V power supply system PL1 and the 12V power supply system PL2. In addition, the circuit protector 14 is not limited to a fusible element, and for example, a protective circuit breaker composed of a semiconductor relay or the like can also be applied.

[0070] The voltage converter 15 is provided in at least one of the plurality of power supply systems PL in the circuit branch portion 13, and converts the voltage of the power supplied from the 48V battery B2 into a second voltage V2 lower than the first voltage V1 and outputs it. Thus, the electronic component unit 10 of the present embodiment can output the second voltage V2 lower than the first voltage V1 in addition to the first voltage V1 corresponding to the battery voltage of the 48V battery B2. The voltage converter 15 is provided in the 12V power supply system PL2 among the plurality of power supply systems PL in the circuit branch portion 13, and converts the 48V voltage corresponding to the first voltage V1 into a 12V voltage corresponding to the second voltage V2 and outputs it to the 12V power supply system PL2.

[0071] The voltage converter 15 is typically composed of a DC / DC converter that converts the voltage of DC power. Figure 7As shown, the voltage converter 15 of the present embodiment is modularized in the following structure, for example: a converter body 15A having electronic components mounted on a substrate is housed in a frame 15B, and a connection terminal 15C is protruded from the frame 15B, thereby being configured to be removable relative to the 12V power supply system PL2 in the circuit branch portion 13. With this structure, the voltage converter 15 is removably assembled to the circuit branch portion 13 in such a manner that the portion constituting the 12V power supply system PL2 in the circuit branch portion 13 is inserted into the connection terminal 15C. In addition, in the 12V power supply system PL2, the above-mentioned circuit protector 14 may be arranged on the upstream side (48V battery B2 side) of the voltage converter 15 and integrated with the voltage converter 15, or may be arranged on the downstream side (second device D2 side) of the voltage converter 15 and integrated with the voltage converter 15. Thus, the circuit protector 14 may also be provided in the circuit branch portion 13 so as to be removable relative to the 12V power supply system PL2 together with the voltage converter 15.

[0072] The electronic component unit 10 configured as described above does not transform a portion of the power input from the 48V battery B2 to the circuit branch portion 13 via the battery terminal 11, but outputs it to each 48V power supply system PL1 at the first voltage V1 equivalent to the battery voltage, and on the other hand, the remaining portion is stepped down to the 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 to the first device D1, which is a 48V drive device, at a 48V voltage equivalent to the first voltage V1, and outputs power to the second device D2, which is a 12V drive device, at a 12V voltage equivalent to the second voltage V2. In addition, at this time, the electronic component unit 10 protects each power supply system PL by interposing the circuit protector 14 between each power supply system PL in the circuit branch portion 13.

[0073] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the power supply line 20 is a wiring component 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. That is, 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 composed of a general electric wire, but can be composed of a planar circuit body such as FPC (Flexible Printed Circuits) and FFC (Flexible Flat Cable). The power supply line 20 of this embodiment is configured to include a first power supply line 21 and a second power supply line 22.

[0074] The first power supply line 21 is a power supply line 20 constituting the 48V power supply system PL1 in the power supply system PL. The first power supply line 21 is provided across the output terminal portion 17 of the electronic component unit 10 and each first device D1, and the 48V power distribution box 30 described later is provided on the first power supply line 21. The first power supply line 21 supplies power outputted from the electronic component unit 10 at a 48V voltage equivalent to the first voltage V1 without passing through the voltage converter 15 to the first device D1, which is a 48V driving device.

[0075] The second power supply line 22 is a power supply line 20 constituting the 12V power supply system PL2 in the power supply system PL. The second power supply line 22 is provided across the output terminal portion 17 of the electronic component unit 10 and each second device D2, and the 12V power distribution box 40 described later is provided on the second power supply line 22. The second power supply line 22 supplies power outputted from the electronic component unit 10 at a 12V voltage equivalent to the second voltage V2 via the voltage converter 15 to the second device D2 as a 12V driving device.

[0076] In addition, the power supply lines 20 configured as described above typically tend to be relatively thin in the transition period when, for example, the first device D1 as a 48V drive device and the second device D2 as a 12V drive device coexist in the vehicle V. The first power supply line 21 constituting the relatively high-voltage 48V power supply system PL1 and the second power supply line 22 constituting the relatively low-voltage 12V power supply system PL2 are configured relatively thick. However, the power supply lines 20 are not limited to this.

[0077] like Figure 1 , Figure 2 As shown, the 48V power distribution box 30 is interposed between the electronic component unit 10 and the first device D1, and distributes the power supplied from the 48V battery B2 to multiple first devices D1. The 48V power distribution box 30 is constructed to include electronic components such as branch parts, fuses (circuit protectors), relays, etc., and they cooperate to distribute power to multiple first devices D1. The 48V power distribution box 30 is set on the first power supply line 21 of the 48V power supply system PL1 that constitutes the power supply system PL, and distributes power that is not stepped down in the electronic component unit 10 and is output at a 48V voltage equivalent to the first voltage V1 to multiple first devices D1 that are 48V drive devices. The first power supply line 21 branches on the output side of the 48V power distribution box 30 into a number corresponding to the number of first devices D1 that distribute power from the 48V power distribution box 30. Figure 2 In the example shown in the figure, a total of three 48V power distribution boxes 30 are provided.

[0078] like Figure 1 , Figure 2As shown, the 12V power distribution box 40 is interposed between the electronic component unit 10 and the second device D2, and distributes the power supplied from the 48V battery B2 to multiple second devices D2. The 12V power distribution box 40 is constructed similarly to the 48V power distribution box 30, including electronic components such as branch parts, fuses (circuit protectors), and relays, which cooperate to distribute power to multiple second devices D2. The 12V power distribution box 40 is set on the second power supply line 22 of the 12V power supply system PL2 that constitutes the power supply system PL, and distributes the power that is stepped down by the voltage converter 15 in the electronic component unit 10 and output at a 12V voltage equivalent to the second voltage V2 to multiple second devices D2 that are 12V drive devices. The second power supply line 22 branches on the output side of the 12V power distribution box 40 into a number corresponding to the number of second devices D2 that distribute power from the 12V power distribution box 40. Figure 2 In the example shown in the figure, a total of one 12V power distribution box 40 is provided.

[0079] The wiring harness WH and the electronic component unit 10 described above can output a portion of the power input from the 48V battery B2 to the circuit branching portion 13 via the battery terminal 11 to each 48V power supply system PL1 at the first voltage V1 equivalent to the battery voltage without transforming the voltage. On the other hand, the wiring harness WH and the electronic component unit 10 can output the remaining portion of the power input from the 48V battery B2 to the circuit branching portion 13 via the battery terminal 11 to the second voltage V2 by the voltage converter 15 to the 12V power supply system PL2. As a result, the electronic component unit 10 can output power to the first device D1 as a 48V drive device at a 48V voltage equivalent to the first voltage V1, and to the second device D2 as a 12V drive device at a 12V voltage equivalent to the second voltage V2 lower than the first voltage V1. As a result, the wiring harness WH and the electronic component unit 10 can appropriately distribute and supply power to the first device D1 and the second device D2 having different drive voltages.

[0080] In this case, the wiring harness WH is configured such that the electronic component unit 10 is directly disposed on the 48V battery B2, and the electronic component unit 10 has a voltage conversion function for converting and outputting a first voltage V1 corresponding to the battery voltage of the 48V battery B2 into a second voltage V2. With this configuration, when the wiring harness WH and the electronic component unit 10, for example, the second device D2 driven by the second voltage V2 is concentrated near the 48V battery B2, the wiring length of the second power supply line 22, which has a relatively thick wire diameter and is prone to increase in weight, can be shortened as much as possible to improve wiring efficiency, and as a result, the weight increase of the wiring harness WH as a whole can be suppressed.

[0081] On this basis, the wiring harness WH and the electronic component unit 10 are configured so that the voltage converter 15 can be loaded and unloaded relative to the power supply system PL in the circuit branch portion 13. According to this structure, for the wiring harness WH and the electronic component unit 10, for example, in the tendency of using the vehicle V for a long time in order to achieve carbon neutrality, when a new device D is added during use, etc., the voltage converter 15 can be appropriately changed and added to match the required performance. As a result, the wiring harness WH and the electronic component unit 10, for example, by selecting the voltage converter 15 in accordance with the addition or update of the device D installed in the vehicle V and assembling it in the electronic component unit 10, it is possible to easily ensure the required voltage output and capacity, for example, even if the electronic component unit 10 is not replaced as a whole with another component, and it can be a structure that is easy to cope with specification changes, etc. In addition, the wiring harness WH and the electronic component unit 10, for example, in the circuit branch portion 13, by providing a structure that can load and unload the voltage converter 15 in each power supply system PL, for example, as Figure 8 , Fig. 9 As shown, the number of outputs of the second voltage V2 which is lower than the first voltage V1 as the battery voltage can also be increased arbitrarily according to the situation. Figure 5 , Figure 6 In the scheme of Figure 8 , Fig. 9 There are two options in the scheme.

[0082] As described above, the wire harness WH and the electronic component unit 10 can appropriately supply power to various devices D mounted on the vehicle V even in a situation where devices D having different driving voltages are mixed.

[0083] In addition, the wiring harness WH and the electronic component unit 10 described above can protect the power system PL by interposing the circuit protector 14 between each power system PL in the circuit branching portion 13 of the electronic component unit 10, so that the circuit protector 14 is cut off when an overcurrent flows through the power system PL. In this case, in the wiring harness WH and the electronic component unit 10, the circuit protector 14 is also configured to be removable relative to the power system PL in the circuit branching portion 13, similarly to the voltage converter 15, so that it can also be a structure that is easy to cope with specification changes, etc.

[0084] In addition, 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 can be made within the scope described in the claims.

[0085] In the above description, the electronic component unit 10 has a circuit protection function in addition to the circuit branching function and the voltage conversion function, but the present invention is not limited thereto. That is, the electronic component unit 10 may not have the circuit protector 14, for example, the circuit protector may be provided at another location on each power supply system PL.

[0086] In the above description, the circuit branching section 13 is described as a case where the power supplied from the 48V battery B2 is branched into a plurality of 48V power supply systems PL1 and a single 12V power supply system PL2, but the present invention is not limited thereto. As mentioned above, there may be two or more 12V power supply systems PL2. 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 section 13.

[0087] In the above description, the power terminal 11 and the unit body 12 are described as being separate bodies, but the present invention is not limited thereto. The power terminal 11 and the unit body 12 may be integrally formed. For example, the power terminal 11 and the circuit branch portion 13 may be integrally connected.

[0088] The electronic component unit and the wiring harness according to the present embodiment may be configured by appropriately combining the components of the above-described embodiment and modified examples.

[0089] In addition, the wiring harness WH and the electronic component unit 10 described above are described as being able to be appropriately changed and added to the voltage converter 15 in accordance with the required performance, for example, when a new device D is added during use. In this regard, as a reference example, the wiring harness and the electronic component unit may also be configured to remove the voltage converter 15 when the voltage converter 15 is no longer needed.

Claims

1. An electronic component unit, characterized in that: have: a power supply terminal connected to a power supply mounted on the vehicle and capable of supplying electric power at a first voltage; a circuit branching portion connected to the power supply terminal to branch the power supplied from the power supply to a plurality of power supply systems; as well as A voltage converter is detachably arranged in the circuit branch portion relative to at least one of the plurality of power supply systems, and converts the voltage of the electric power supplied from the power supply into a second voltage lower than the first voltage and outputs the second voltage.

2. The electronic component unit according to claim 1, wherein: Also available: A circuit protection unit is detachably provided in the circuit branch portion with respect to the power supply system, and cuts off when an overcurrent flows through the power supply system to protect the power supply system.

3. A wiring harness, characterized in that: have: an electronic component unit provided in a power source mounted on the vehicle and capable of supplying electric power at a first voltage; as well as a power supply line for supplying power from the electronic component unit to a device mounted on the vehicle, The electronic component unit has: a power terminal connected to the power source; a circuit branching portion connected to the power supply terminal to branch the power supplied from the power supply to a plurality of power supply systems; as well as A voltage converter is detachably arranged in the circuit branch portion relative to at least one of the plurality of power supply systems, and converts the voltage of the electric power supplied from the power supply into a second voltage lower than the first voltage and outputs the second voltage.

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