DC / DC converter device and power supply system

Abstract

To provide a DC / DC converter device and a power supply system that can easily design a new circuit without causing a deterioration in the thermal environment even when the number of auxiliary devices, equipment, etc. that require electric power increases. [Solution] The DC / DC converter device 20 comprises a DC / DC converter 22 that converts the battery voltage of a high-voltage battery 100 into a predetermined output voltage, a case 23 having a case body 231 that houses the DC / DC converter 22 and a lid portion 233 that covers an opening 232 of the case body 231, and a storage portion 24 that is attached to the lid portion 233 and detachably houses electronic components 21 that are respectively connected to a plurality of branch lines L21 to L27 that branch off a power supply line L1 to which the output voltage of the DC / DC converter 22 is supplied.

Description

[Technical Field]

[0001] The present invention relates to a DC / DC converter device and a power supply system. [Background technology]

[0002] Conventionally, power supply systems for electric vehicles include a DC / DC converter that steps down the power of a high-voltage storage battery to a low-voltage battery such as 12 V, and a case that houses the DC / DC converter. In this power supply system, the power supply line after the DC / DC converter is branched within the case, with one power supply line connected to the low-voltage battery and the other power supply line connected to a control ECU, navigation system, lights, etc. via fuses, relays, etc. (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-52185 Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, electric vehicles have tended to have an increasing number of accessories and devices that require power, which has created a need to accommodate a large number of fuses, relays, and other components within the power supply system. However, accommodating a large number of electronic components, such as fuses, fusible links, and relays, within the power supply system case may worsen the thermal environment within the system due to heat generated by the electronic components. Furthermore, increasing the system size to improve the thermal environment places restrictions on installation within the electric vehicle. Furthermore, additional circuits must be added within the system to accommodate the increasing number of accessories and devices that require power, and improvements have been sought.

[0005] The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a DC / DC converter device and a power supply system that enable the miniaturization of an electrical junction box without causing a deterioration in the thermal environment even when there is an increase in the number of accessories, devices, etc. that require electric power. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a DC / DC converter device according to the present invention has the following features. a DC / DC converter that converts the battery voltage of the first battery into a predetermined output voltage; a first case having a case body that houses the DC / DC converter and a lid that covers an opening of the case body; a housing portion attached to the lid portion and detachably housing first electronic components connected to a plurality of first branch lines branched from a first power supply line to which the output voltage of the DC / DC converter is supplied, DC / DC converter device.

[0007] In order to achieve the above-mentioned object, the power supply system according to the present invention has the following features. The DC / DC converter device described above; an electric junction box including a second branch circuit that branches a second power supply line of a second battery into a plurality of second branch lines, second electronic components that are connected to the second branch lines, and a second case that houses the second branch circuit and the second electronic components; a fourth electric wire connected between the DC / DC converter device and the electric junction box, an output voltage of the DC / DC converter is supplied to the second electronic component via the fourth electric wire; Power supply system. [Effects of the Invention]

[0008] The DC / DC converter device and power supply system according to the present invention have the advantage of facilitating the design of new circuits without deteriorating the thermal environment even when there are an increasing number of accessories, devices, etc. that require power.

[0009] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic overall view showing a power supply system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a circuit diagram of the power supply system shown in FIG. [Figure 3] FIG. 3 is a perspective view showing the DC / DC converter device shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the DC / DC converter device shown in FIG. [Figure 5] FIG. 5 is a circuit diagram of the DC / DC converter device shown in FIG. [Figure 6] FIG. 6 is a circuit diagram of the electrical junction box shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] A DC / DC converter device and a power supply system according to an embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, a power supply system 10 according to an embodiment of the present invention is mounted on an electric vehicle. The power supply vehicle is equipped with two batteries: a high-voltage battery (first battery) 100 with a high voltage (e.g., 300 V) and a low-voltage battery 200 (e.g., 12 V, second battery).

[0012] The power supply system 10 includes a DC / DC converter device 20 and an electric junction box 30. The DC / DC converter device 20 is connected to a high-voltage battery 100 and reduces the battery voltage of the high-voltage battery 100 to a desired output voltage (for example, 12 V). The DC / DC converter device 20 is connected to a DC / DC-based electronic device 300 (first electronic device) described below and supplies the output voltage to the electronic device 300. The DC / DC converter device 20 of this embodiment houses electronic components 21 (first electronic components) such as fuses and relays that are connected to the electronic device 300 and the electric junction box 30 described below.

[0013] The electrical junction box 30 is connected to the low-voltage battery 200 and the DC / DC converter device 20. The electrical junction box 30 is connected to a low-voltage electronic device 400 (second electronic device) described below, and supplies the battery voltage of the low-voltage battery 200 or the output voltage of the DC / DC converter device 20 to the electronic device 400. The electrical junction box 30 of this embodiment houses electronic components 31 (second electronic components) such as fuses and relays that are connected to the electronic device 400.

[0014] Next, we will explain the DC / DC converter device 20. The DC / DC converter device 20 includes a DC / DC converter 22 (see FIG. 2), a case 23 (see FIG. 1), and a storage section 24 (see FIG. 1). The DC / DC converter 22 converts the battery voltage of the high-voltage battery 100 into a predetermined output voltage (for example, 12 V).

[0015] 3, case 23 has a case body 231 and a lid 233 that covers an opening 232 of case body 231, and DC / DC converter 22 is housed in case body 231. Housing section 24 is attached to lid section 233, and detachably houses electronic components 21 such as fuses 21A to 21F, relays 21G and 21H, and fusible link 21I shown in FIG.

[0016] 2 and 5, fuses 21A-21F and relays 21G, 21H are connected between DC / DC converter 22 and electronic devices 300 such as instrument panel device 300A, sub-relay box 300B, power back door 300C, air conditioner 300D, power conditioner 300E, and de-icer 300F. DC / DC electronic devices 300 are devices that do not affect the running of the vehicle. As shown in FIG. 2, fusible link 21I is connected between DC / DC converter 22 and low-voltage battery 200.

[0017] The DC / DC converter 22 cannot immediately supply an output voltage when the power supply is turned on, but is able to supply an output voltage some time after the power supply is turned on. The DC / DC electronic device 300 is not supplied with power after the power supply is turned on, and is controlled so that power is supplied once the DC / DC converter 22 is able to supply an output voltage. As a result, the DC / DC electronic device 300 is a device that receives power supply only from the DC / DC converter 22.

[0018] 3 to 5, the DC / DC converter device 20 includes a substrate 25, a plurality of electric wires 26 (first electric wires), a connector 27 (first connector), and an electric wire 28 (second electric wire). As shown in Fig. 4, the substrate 25 is housed in a case main body 231 and has a DC / DC converter 22 mounted thereon. The substrate 25 is disposed on the bottom opposite to the lid 233 of the case main body 231.

[0019] 4 and 5, the electric wires 26 are drawn out from the housing 24 and individually connected to the electronic components 21. A connector 27 is attached to the tip of each electric wire 26 and is detachably connected to a connector (not shown) provided on the board 25. The electric wires 28 are drawn out to the outside of the case 23 and connect the board 25 to the electronic device 300. The electronic components 21 (21A to 21H) are each connected to the plurality of electric wires 28 via the plurality of electric wires 26 and the board 25.

[0020] As shown in Fig. 5, the DC / DC converter device 20 includes a branch circuit 29 (first branch circuit), an electric wire 210 (third electric wire), and a connector 211 (third connector). The branch circuit 29 is housed in the housing portion 24. The branch circuit 29 branches a power supply line L1 (first power supply line) to which the output voltage of the DC / DC converter 22 is supplied into a plurality of branch lines L21 to L27. As shown in Figs. 3 and 4, the electric wire 210 is drawn out from the housing portion 24 and connected to the power supply line L1 of the branch circuit 29. The connector 211 is attached to the tip of the electric wire 210, and is detachably connected to a connector (not shown) provided on the substrate 25.

[0021] As shown in FIG. 1, the electrical junction box 30 constituting the power supply system 10 has a case 34 (second case). The case 34 accommodates a branch circuit 37 (second branch circuit) and electronic components 31 (second electronic components) such as fuses 31A-31F and a relay 31G, as shown in FIG. 2. The branch circuit 37 is a circuit that branches a power supply line L3 (second power supply line) of the low-voltage battery 200 into a plurality of branch lines L41-L48 (second branch lines). The branch line L41 is connected to an electric wire 40 (fourth electric wire) and is connected to the DC / DC converter device 20. The branch line L42 is connected to a relief terminal 500 (see FIG. 6). The fuses 31A-31F and the relay 31G are connected to the respective branch lines L43-L48. The output voltage of the DC / DC converter 22 is supplied to the electronic components 31 via the electric wire 40.

[0022] As shown in FIG. 6, fuses 31A to 31F and relay 31G are connected to electronic devices 400 such as instrument panel equipment 400A, sub-relay 400B, ABS (Anti-lock Brake System) 400C, radio 400D, wiper 400E, and power controller unit 400F via electric wires 50 individually drawn out from case 34.

[0023] These low-voltage electronic devices 400 are devices that affect the running of the vehicle. The low-voltage electronic devices 400 are controlled so that they can receive power immediately after power-on, and are configured to receive power from both the DC / DC converter 22 and the low-voltage battery 200. To explain in more detail, immediately after power-on, when no output voltage is output from the DC / DC converter device 20, the electronic devices 400 receive power from the low-voltage battery 200. When an output voltage is output from the DC / DC converter device 20, the electronic devices 400 receive power from the DC / DC converter device 20.

[0024] As described above, in the DC / DC converter device 20 according to an embodiment of the present invention, the electronic components 21 (21A to 21I) are accommodated in the accommodation section 24 attached to the lid section 233. Therefore, the lid section 233 can be removed from the case body 231 to replace the electronic components 21, such as the fuses 21A to 21F, the relays 21G and 21H, and the fusible link 21I, in the accommodation section 24 provided in the lid section 233. That is, in the DC / DC converter device 20 according to an embodiment of the present invention, the electronic components 21, which were conventionally accommodated in the electric junction box 30, can now be accommodated within the DC / DC converter device 20. This reduces deterioration of the thermal environment of the electric junction box 30, and enables the electric junction box 30 to be made smaller.

[0025] Furthermore, in the DC / DC converter device 20 according to the embodiment of the present invention, the connectors 27 provided at the ends of the plurality of electric wires 26 are detachably mounted on the substrate 25. Therefore, the plurality of electric wires 26 can be removed from the substrate 25, which makes it easier to replace the electronic components 21 such as the fuses 21A to 21F, the relays 21G and 21H, and the fusible link 21I.

[0026] Furthermore, in the DC / DC converter device 20 according to the embodiment of the present invention, the branch circuit 29 is accommodated in the accommodation portion 24. Therefore, there is no need to provide the branch circuit 29 on the board 25, and the board 25 for a general-purpose DC / DC converter 22 can be used.

[0027] Furthermore, in the DC / DC converter device 20 according to an embodiment of the present invention, a fusible link (FL) 21I connected between the DC / DC converter 22 and the low-voltage battery 200 is provided inside the DC / DC converter device 20. Therefore, an overcurrent caused by a failure of the DC / DC converter 22 can be accurately cut off.

[0028] Furthermore, in the DC / DC converter device 20 according to an embodiment of the present invention, the fuses 21A to 21F and the relays 21G and 21H, which are electronic components 21, are connected between the DC / DC converter 22 and the electronic device 300. The electronic device 300 receives power supply only from the DC / DC converter 22, and does not receive power supply from the low-voltage battery 200. Therefore, the fuses 21A to 21F and the relays 21G and 21H connected to the electronic device 300, which receives power supply only from the DC / DC converter 22, can be accommodated inside the DC / DC converter device 20.

[0029] On the other hand, according to the power supply system 10 of the embodiment of the present invention, the output voltage of the DC / DC converter 22 is supplied to the electronic component 31 via the electric wire 40, so that the DC / DC converter 22 and the low-voltage battery 200 can supply power to the electronic component 31.

[0030] Furthermore, in the power supply system 10 according to the embodiment of the present invention, the electronic device 400 connected to the electronic component 21 receives power from both the DC / DC converter 22 and the low-voltage battery 200. The electronic device 300 connected to the electronic component 31 receives power only from the DC / DC converter 22, and does not receive power from the low-voltage battery 200. This allows the electronic components 21 and 31 to be efficiently housed separately in the DC / DC converter device 20 and the electrical junction box 30.

[0031] The present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. In addition, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as the present invention can be achieved.

[0032] In the above-described embodiment, the connector 27 detachably provided on the substrate 25 is attached to the tip of the electric wire 26, but this is not limitative. The electric wire 26 may be directly connected to the substrate 25 by soldering or the like.

[0033] In the above-described embodiment, the branch circuit 29 is accommodated in the accommodating portion 24, but the present invention is not limited to this. The branch circuit 29 may be provided on the substrate 25.

[0034] Here, the features of the above-described embodiments of the DC / DC converter device and power supply system according to the present invention will be briefly summarized and listed below in [1] to [7].

[0035] [1] a DC / DC converter (22) that converts the battery voltage of the first battery (100) into a predetermined output voltage; a first case (23) having a case body (231) that houses the DC / DC converter (22) and a lid portion (233) that covers an opening (232) of the case body (231); and a housing portion (24) attached to the cover portion (233) and detachably housing first electronic components (21) connected to a plurality of first branch lines (L21 to L27) branched from a first power supply line (L1) to which the output voltage of the DC / DC converter (22) is supplied. DC / DC converter device (20).

[0036] According to the DC / DC converter device (20) having the configuration [1] above, even if the number of auxiliary devices, equipment, etc. that require electric power increases, the thermal environment is not deteriorated and the size of the electrical connection box (30) can be reduced.

[0037] [2] In the DC / DC converter device (20) described in [1] above, the first electronic component (21) is connected between the DC / DC converter (22) and a first electronic device (300); a substrate (25) accommodated in the case body (231) and on which the DC / DC converter (22) is mounted; a first electric wire (26) drawn out from the housing portion (24) and connected to the first electronic component (21); a first connector (27) attached to the tip of the first electric wire (26) and detachably connected to the board (25); a second electric wire (28) that is drawn out of the first case (23) and connects the board (25) and the first electronic device (300); The first electronic component (21) is connected to the second electric wire (28) via the first electric wire (26) and the substrate (25). DC / DC converter device (20).

[0038] According to the DC / DC converter device (20) having the above configuration [2], the first electronic component 21 can be easily replaced.

[0039] [3] In the DC / DC converter device (20) described in [1] above, a first branch circuit (29) housed in the housing portion (24) and branching the first power supply line (L1) into a plurality of first branch lines (L21 to L27); a substrate (25) accommodated in the case body (231) and on which the DC / DC converter (22) is mounted; a third electric wire (210) drawn out from the housing portion (24) and connected to the first branch circuit (29); and a second connector (211) attached to the tip of the third electric wire (210) and detachably connected to the substrate (25). DC / DC converter device (20).

[0040] According to the DC / DC converter device (20) having the configuration [3] above, the first branch circuit (29) is accommodated in the accommodation portion (24). Therefore, it is not necessary to provide the first branch circuit (29) on the board (25), and the board (25) for the general-purpose DC / DC converter (22) can be used.

[0041] [4] In the DC / DC converter device (20) described in [1] above, One of the plurality of first electronic components (21) is connected between the DC / DC converter (22) and a second battery (200). DC / DC converter device (20).

[0042] According to the DC / DC converter device (20) having the configuration [4] above, the first electronic component (21) functioning as a protective member can be provided in the vicinity of the DC / DC converter (22), thereby enabling an overcurrent caused by a failure of the DC / DC converter (22) to be accurately interrupted.

[0043] [5] In the DC / DC converter device (20) described in [4] above, the rest of the plurality of first electronic components (21) are connected between the DC / DC converter (22) and the first electronic device (300); a first electronic device (300) to which the first electronic component (21) is connected receives power supply only from the DC / DC converter (22) and does not receive power supply from the second battery (200); DC / DC converter device (20).

[0044] According to the DC / DC converter device (20) having the configuration [5] above, the first electronic component (21) connected to the electronic device (300) receiving power supply only from the DC / DC converter (22) can be accommodated in the DC / DC converter device (20).

[0045] [6] The DC / DC converter device (20) described in [1] above; an electric junction box (30) having a second branch circuit (37) that branches a second power supply line (L3) of a second battery (200) into a plurality of second branch lines (L41 to L48), second electronic components (31) that are connected to the second branch lines (L41 to L48), respectively, and a second case (34) that houses the second branch circuit (37) and the second electronic components (31); a fourth electric wire (40) connected between the DC / DC converter device (20) and the electrical junction box (30); The output voltage of the DC / DC converter (22) is supplied to the second electronic component (31) via the fourth electric wire (40). Power supply system (10).

[0046] According to the power supply system (10) having the configuration [6] above, even if the number of auxiliary devices, equipment, etc. that require electric power increases, the size of the electrical connection box (30) can be reduced without causing a deterioration in the thermal environment.

[0047] [7] In the power supply system (10) described in [6] above, a second electronic device (400) to which the second electronic component (31) is connected receives power from both the DC / DC converter (22) and the second battery (200); a first electronic device (300) to which the first electronic component (21) is connected receives power supply only from the DC / DC converter (22) and does not receive power supply from the second battery (200); Power supply system (10).

[0048] According to the power supply system (10) having the configuration [7] above, the first electronic component (21) and the second electronic component (31) can be efficiently housed separately in the DC / DC converter device (20) and the electrical connection box (30). [Explanation of symbols]

[0049] 10 Power System 20 DC / DC converter device 21 First Electronic Component (First Electronic Component) 22 DC / DC converter Case 23 (Case 1) 24 Storage section 25 boards 26 Electric Wire (First Electric Wire) 27 Connector (1st Connector) 28 Electric Wire (Second Electric Wire) 29 Branch circuit (first branch circuit) 30 Electrical junction box 31 Electronic Components (Secondary Electronic Components) Case 34 (Case 2) 37 Branch circuit (second branch circuit) 40 Electric Wire (4th Electric Wire) 100 High voltage battery (first battery) 200 Low voltage battery (second battery) 210 Electric Wire (Third Electric Wire) 211 Connector (Second Connector) 231 Case body 232 Aperture 233 Lid 300 Electronic equipment (1st electronic equipment) 400 Electronic equipment (secondary electronic equipment) L1 Power line (first power line) L21~L27 Branch Line (First Branch Line) L3 power line (second power line) L41~L48 Branch Line (Second Branch Line)

Claims

1. a DC / DC converter that converts the battery voltage of the first battery into a predetermined output voltage; a first case having a case body that houses the DC / DC converter and a lid that covers an opening of the case body; a housing portion attached to the lid portion and detachably housing first electronic components connected to a plurality of first branch lines branched from a first power supply line to which the output voltage of the DC / DC converter is supplied, DC / DC converter device.

2. 2. The DC / DC converter device according to claim 1, the first electronic component is connected between the DC / DC converter and a first electronic device; a substrate housed in the case body and on which the DC / DC converter is mounted; a first electric wire drawn out from the housing and connected to the first electronic component; a first connector attached to a tip of the first electric wire and detachably connected to the circuit board; a second electric wire that is drawn out of the first case and connects the board and the first electronic device; the first electronic component is connected to the second electric wire via the first electric wire and the substrate; DC / DC converter device.

3. 2. The DC / DC converter device according to claim 1, a first branch circuit housed in the housing portion and branching the first power supply line into a plurality of first branch lines; a substrate housed in the case body and on which the DC / DC converter is mounted; a third electric wire drawn out from the housing and connected to the first branch circuit; a second connector attached to a tip of the third electric wire and detachably connected to the board, DC / DC converter device.

4. 2. The DC / DC converter device according to claim 1, one of the plurality of first electronic components is connected between the DC / DC converter and a second battery; DC / DC converter device.

5. 5. The DC / DC converter device according to claim 4, the remainder of the plurality of first electronic components are connected between the DC / DC converter and a first electronic device; a first electronic device to which the first electronic component is connected receives power supply only from the DC / DC converter and does not receive power supply from the second battery; DC / DC converter device.

6. The DC / DC converter device according to claim 1 ; an electric junction box including a second branch circuit that branches a second power supply line of a second battery into a plurality of second branch lines, second electronic components that are connected to the second branch lines, and a second case that houses the second branch circuit and the second electronic components; a fourth electric wire connected between the DC / DC converter device and the electrical junction box, an output voltage of the DC / DC converter is supplied to the second electronic component via the fourth electric wire; Power supply system.

7. 7. The power supply system according to claim 6, a second electronic device to which the second electronic component is connected receives power from both the DC / DC converter and the second battery; a first electronic device to which the first electronic component is connected receives power supply only from the DC / DC converter and does not receive power supply from the second battery; Power supply system.

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