JP2018052229A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric junction box for distributing input power from a power source to an auxiliary machine corresponding to the voltage of the input power and an auxiliary machine corresponding to the voltage of the input power in one electric junction box. An electrical junction box 1 is an electrical junction box that distributes input power from a power source B to an auxiliary machine 3 corresponding to the voltage of the input power and an auxiliary machine 4 corresponding to the voltage of the input power. Therefore, the distribution circuit 9 for distributing the input power from the power supply B to the auxiliary equipment 3 and the auxiliary equipment 4 and the voltage of the input power distributed to the auxiliary equipment 4 by the distribution circuit 9 correspond to the auxiliary equipment 4. It includes a transformer circuit 11 that transforms into a voltage. [Selection diagram] Fig. 1

Description

  The present invention relates to an electrical junction box that is mounted on a vehicle such as an automobile and distributes power from a power source such as a battery to a plurality of auxiliary machines.

  In recent years, in vehicles such as automobiles, the number of auxiliary machines mounted on the vehicle tends to increase, and in order to ensure sufficient power supply against such an increase in the number of auxiliary machines, for example, a battery is installed. There is a tendency to increase the voltage from 12V to 48V.

  Auxiliary equipment needs to be changed to 48V compatible with 48V battery, but all auxiliary equipment cannot be changed to 48V compatible at the same time, so there are 12V compatible auxiliary equipment and 48V compatible auxiliary equipment. May be mixed. As a result, a 12V auxiliary machine and a 48V auxiliary machine coexist or coexist.

  In a conventional electrical junction box, input power from a battery is distributed to a plurality of auxiliary machines without being transformed (Patent Document 1). For this reason, in the conventional electrical junction box, when the voltage of the battery is 12V, for example, the input power of 12V from the battery can be distributed only to the 12V compatible auxiliary machine corresponding to the voltage of the input power, It could not be distributed to a 48V auxiliary machine that does not correspond to the input power voltage. That is, it is impossible to distribute the input power from the battery to both the auxiliary machine corresponding to the voltage of the input power and the auxiliary machine not corresponding to the voltage of the input power with one electric junction box.

WO2014 / 076987A1

  Accordingly, the present invention provides an electric that can distribute input power from a power source to an auxiliary machine corresponding to the voltage of the input power and an auxiliary machine not corresponding to the voltage of the input power with one electric junction box. The purpose is to provide a junction box.

  The present invention is an electrical junction box that distributes input power from a power source to a first auxiliary machine that corresponds to the voltage of the input power and a second auxiliary machine that does not correspond to the voltage of the input power. A distribution circuit for distributing the input power from the first auxiliary machine to the second auxiliary machine, and a voltage of the input power distributed to the second auxiliary machine by the distribution circuit to the second auxiliary machine The electrical connection box includes: a transformer circuit that transforms to a corresponding voltage; and an outer shell of the electrical junction box and a housing that houses the distribution circuit and the transformer circuit.

The first auxiliary machine corresponding to the input power voltage is the first auxiliary machine having the same corresponding voltage as the input power voltage, and the second auxiliary machine not corresponding to the input power voltage is the input power voltage. This is a second auxiliary machine having a different voltage.
If the power supply voltage is 12V and the corresponding voltage of the second auxiliary machine is 48V, the transformer circuit is a booster circuit that boosts the 12V voltage to 48V voltage. Also, if the power supply voltage is 48V and the corresponding voltage of the second auxiliary machine is 12V, the transformer circuit is a step-down circuit that steps down the 48V voltage to 12V voltage.

  According to the present invention, the input power from the power source is distributed without being transformed to the first auxiliary machine corresponding to the voltage of the input power, and on the other hand, to the second auxiliary machine not corresponding to the voltage of the input power. Then, in order to transform and distribute the voltage to the corresponding voltage of the second auxiliary machine by the transformer circuit, the first auxiliary machine corresponding to the voltage of the input power is supplied to the input power from the power source in one electrical junction box, It can be distributed to the second auxiliary machine that does not correspond to the voltage of the input power.

  As an aspect of the present invention, among the input power distributed to the first auxiliary machine and the input power transformed by the transformer circuit, a high voltage provided with a first electric circuit through which high-voltage side input power is conducted is provided. And a low voltage board provided with a second electric circuit through which the input power on the low voltage side is conducted among the input power distributed to the first auxiliary machine and the input power transformed by the transformer circuit. It may be provided.

  According to the present invention, the high voltage substrate and the low voltage substrate can be divided into separate substrates. Thereby, it can suppress that the safety measure with respect to a high voltage becomes complicated by performing the safety measure (for example, insulation measure) with respect to a high voltage only to a high voltage board | substrate.

  Further, by dividing the high voltage substrate and the low voltage substrate into separate substrates as described above, it is possible to prevent the voltage of the high voltage substrate from acting on the low voltage substrate.

  Further, as an aspect of the present invention, the high voltage substrates may be collected and arranged at a predetermined location in the casing.

  The predetermined location in the housing may be one location or a plurality of locations. Moreover, the predetermined part in a housing | casing may be clarified by dividing with the existing high voltage board | substrate or an additional insulating board.

  According to the present invention, the high voltage substrate can be managed separately from the low voltage substrate. Thereby, it can suppress that the safety measure with respect to a high voltage becomes complicated.

  In addition, since the high-voltage board is arranged at a predetermined position in the housing, it can be easily distinguished whether the board is a high-voltage board or not depending on the arrangement position of the board in the housing.

  In addition, if the predetermined place is limited to one place, the high voltage board is arranged at one place in the housing, so it is only necessary to take safety measures against the high voltage at the one place. The complexity of safety measures against

  As an aspect of the present invention, the predetermined portion may be within a first range from a first position in the first direction to one end in the first direction inside the housing.

  If the first direction is the up-down direction, the first range can be set to the entire one side (for example, the upper side) of the upper and lower sides in the housing, and if the first direction is the left-right direction, One direction can be set to the entire one side (for example, the entire right side) of the left and right sides in the housing.

  According to the present invention, the high-voltage board can be disposed in a limited manner within a first range from a first position in the first direction in the housing to one end in the first direction. As a result, safety measures against high voltage can be limited to the first range, and the complexity of safety measures against high voltage can be suppressed.

  Further, as an aspect of the present invention, the predetermined portion includes, in the housing, a second range from a second position on the second direction orthogonal to the first direction to one end in the second direction, It may be a common range with the first range.

  According to the present invention, the high voltage substrate is limited to a common range between the second range from the second position on the second direction orthogonal to the first direction to one end in the second direction and the first range. be able to. That is, since the restriction is further limited than in the case where the first range is restricted, it is possible to further suppress the complication of the safety measure against the high voltage.

  Further, as an aspect of the present invention, the transformer circuit is interposed in an electric circuit through which the input power from the power source is conducted, and a switch element that controls the input power conducted through the electric circuit in a time-sharing manner, and the electric circuit in the electric circuit And a smoothing circuit for smoothing the input power time-division controlled by the switch element. The switch element is a semiconductor fuse and detects a current flowing in the electric circuit. The current sensor, the semiconductor switch interposed in the electric circuit, and when the detected value of the current sensor is less than a predetermined current value, the semiconductor switch is electrically connected to the electric circuit by chopper control. Input power is time-division controlled, and when the detected value of the current sensor is a current value equal to or greater than a predetermined current value, the semiconductor switch is turned off to control the electric circuit A, and a control unit to cut off.

  According to the present invention, the semiconductor switch can be shared between the step-down circuit and the semiconductor fuse. Thereby, the number of semiconductor switches in the electrical junction box can be reduced, and the control system for controlling the semiconductor switches can be simplified.

  Further, as an aspect of the present invention, a first electric wire for supplying the input power distributed to the first auxiliary machine by the distribution circuit to the first auxiliary machine, and the input power transformed by the transformer circuit A second electric wire for supplying the second auxiliary machine to the second auxiliary machine, and the housing includes a first opening for bundling the first electric wires and pulling them out from the inside of the housing; A second opening for bundling the second electric wires and pulling them out from the inside of the housing may be provided.

  Of the first electric wire and the second electric wire, the direction in which relatively high voltage power is conducted is referred to as a high voltage wire, and the direction in which relatively low voltage power is conducted is referred to as a low voltage wire.

  According to the present invention, the high-voltage electric wires and the low-voltage electric wires can be separately bundled and pulled out from the housing, so that the high-voltage electric wires and the low-voltage electric wires can be easily distinguished from each other. Measures can be taken appropriately.

  As an aspect of the present invention, the shape of the opening surface of the first opening may be different from the shape of the opening surface of the second opening.

  According to the present invention, whether the electric wire is a high-voltage electric wire or a low-voltage electric wire can be easily distinguished by the shape of the opening from which the electric wire (the first electric wire or the second electric wire) is drawn.

  As an aspect of the present invention, the color or pattern of the outer peripheral surface of the first electric wire may be different from the color or pattern of the outer peripheral surface of the second electric wire.

  According to the present invention, whether the electric wire is a high-voltage electric wire or a low-voltage electric wire can be easily distinguished by the color or pattern of the outer peripheral surface of the electric wire.

  Moreover, as an aspect of the present invention, the first electric wire and the second electric wire have a core wire and a covering portion covering the core wire, and the first electric wire and the second electric wire have a relatively high voltage. The covering portion of the electric wire that conducts electric power may be formed thicker than the covering portion of the electric wire that conducts relatively low-voltage electric power.

  According to the present invention, it is possible to suppress a short circuit between the first electric wire and the second electric wire, which is relatively conductive with high voltage power.

  According to the present invention, it is possible to distribute the input power from the power source to the auxiliary equipment corresponding to the voltage of the input power and the auxiliary equipment not corresponding to the voltage of the input power with one electric junction box.

The block diagram which shows the electrical connection structure of the electrical junction box which concerns on embodiment of this invention. FIG. 2 is a circuit diagram illustrating an example of a booster circuit in FIG. 1. The block diagram which shows the fuse of FIG. Sectional drawing which shows an electric junction box. The external view of the housing | casing which shows an example of the arrangement | positioning location of a high voltage board | substrate. The block diagram which shows the electrical connection structure of the electrical connection box in the case of stepping down input electric power. FIG. 7 is a circuit diagram showing an example of the step-down circuit in FIG. 6. The block diagram which shows the electrical connection structure of the electrical connection box in the case of raising / lowering input power. The external view of the housing | casing which shows the modification of how to pull out the electric wire from a housing | casing. The perspective view of the housing | casing which shows the modification of the shape of the opening part for drawing out an electric wire. The side view of the electric wire which shows the modification of the pattern of the outer peripheral surface of an electric wire. The schematic sectional drawing of the electrical-connection box which shows the modification of the arrangement | positioning location of a booster circuit and the connector for power supplies. The schematic sectional drawing of the electrical-connection box which shows the other modification of the arrangement | positioning location of a booster circuit and the connector for power supplies. The schematic sectional drawing of the electrical-connection box which shows the other modification of the arrangement | positioning location of a booster circuit and the connector for power supplies. The schematic sectional drawing of the electrical-connection box which shows the other modification of the arrangement | positioning location of a booster circuit and the connector for power supplies.

An embodiment of the present invention will be described below with reference to the drawings.
(Embodiment)
FIG. 1 is a block diagram showing an electrical connection structure of an electrical junction box 1 according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a booster circuit 11 of FIG. 1, and FIG. FIG. 4 is a configuration diagram showing the fuse 23 of FIG. 1, and FIG. 4 is a cross-sectional view showing the electrical junction box 1.

  As shown in FIG. 1, an electrical junction box 1 is mounted on a vehicle such as an automobile, and input power input from a power source B mounted on the vehicle is converted into a plurality of auxiliary machines 3 corresponding to the voltage of the input power. , A device that distributes to a plurality of auxiliary machines 4 that do not correspond to the voltage of the input power.

  Note that an auxiliary device corresponding to the input power voltage is an auxiliary device having the same corresponding voltage as the input power voltage, and an auxiliary device not corresponding to the input power voltage is an auxiliary device having a corresponding voltage different from the input power voltage. Machine.

  In this embodiment, the power source B is a 12V DC power source such as a battery. Auxiliary machine 3 is a low-voltage auxiliary machine compatible with 12V, and specifically, ignition system loads (head lamps, tail lamps, stop lamps, turn lamps, etc.), horns, panel on-board instruments (speedometer, fuel system) , Distance system, etc.), power window, wiper, seat heater, blower, door lock, electric mirror, etc. Auxiliary machine 4 is a 48V-compatible high-voltage auxiliary machine. Specifically, body system loads (such as electric compressors for air conditioner systems) and drive system loads (such as Drive by wire, break by wire) -by-wire). That is, the electrical junction box 1 converts the input power of 12V from the power source B into the low voltage auxiliary machine 3 corresponding to 12V corresponding to the voltage of the input power and the high voltage auxiliary corresponding to 48V not corresponding to the voltage of the input power. Distribute to machine 4.

  The electrical junction box 1 includes a plurality of circuit boards 5 provided with electrical elements (for example, various electronic components and electrical circuits) for distributing input power from the power source B to the low voltage auxiliary machine 3 and the high voltage auxiliary machine 4. And a casing 7 that constitutes an outer shell of the electrical junction box 1 and accommodates a plurality of circuit boards 5 (see FIG. 4).

  In the plurality of circuit boards 5, as the electrical elements described above, a distribution circuit 9 that distributes input power from the power source B to the low voltage auxiliary machine 3 and the high voltage auxiliary machine 4, and the distribution circuit 9 to the high voltage auxiliary machine 4. A power supply connector 13 to which a booster circuit 11 that boosts the distributed 12V input power to 48V (that is, the corresponding voltage of the high voltage auxiliary machine 4) and a mating connector 12 to which the electric wire W1 from the power supply B is connected are connected. And low voltage auxiliary connectors 16 and 17 to which the counterpart connectors 14 and 15 to which the electric wires W2 and W3 from the low voltage auxiliary devices 3a and 3b are connected are connected, and electric wires from the high voltage auxiliary devices 4a and 4b. Current exceeding the rated current flows through the high voltage auxiliary connectors 20 and 21 to which the mating connectors 18 and 19 to which the W4 and W5 are connected are connected, and the distribution circuit 9 and the electric wires W2, W3, W4 and W5. Multiple hi to prevent It is provided and over 23's.

In this embodiment, two low-voltage accessory connectors and two high-voltage accessory connectors are provided. However, one or three or more connectors may be provided.
Each of the electric wires W1, W2, W3, W4, and W5 is a covered electric wire in which a covering portion made of a resin member is formed around a core wire made of a conductive member. The electric wires W2 and W3 are low-voltage electric wires through which the low-voltage power of 12V supplied to the low-voltage auxiliary machine 3 is conducted, and the electric wires W4 and W5 are high-voltage of 48V supplied to the high-voltage auxiliary machine 4. It is a high-voltage electric wire that conducts power.

  The distribution circuit 9 is a main electric circuit 91 for inputting input power from the power source B, and a low voltage system that branches from the main electric circuit 91 and divides the input power into electric power for low-voltage auxiliary equipment and electric power for high-voltage auxiliary equipment. A plurality of low-voltage branch circuits 94 for branching from the low-voltage auxiliary circuit 92 and distributing the electric power for the low-voltage auxiliary machine to each low-voltage auxiliary machine 3; A plurality of high-voltage branch circuits 95 for branching from the system electrical circuit 93 and distributing the power for the high-voltage auxiliary machines to each high-voltage auxiliary machine 4 are configured.

  The plurality of circuit boards 5 include at least one circuit board 51 provided with the booster circuit 11 and one or more electrical elements that conduct the 12V power on the low voltage side of the 12V power and 48V power (in this embodiment, 2 ) And one or more (two in this embodiment) high-voltage boards 54 provided with electrical elements through which 48V power on the high-voltage side out of 12V power and 48V power is conducted. 55.

  More specifically, the circuit board 51 includes, in addition to the booster circuit 11, a main electric circuit 91, a first section 92 a branched from the main electric circuit 91 among the low-voltage electric circuit 92, and a main electric circuit among the high-voltage electric circuit 93. A first section 93 a branched from the electric circuit 91 and a power connector 13 connected to the main electric circuit 91 are provided.

  The step-up circuit 11 is interposed in the first section 93a of the high-voltage system circuit 93, and the high-voltage auxiliary power (that is, 12V power) divided from the main circuit 91 to the first section 93a is supplied to the high-voltage auxiliary circuit 93. The voltage is boosted to the corresponding voltage (ie 48V) and output to the downstream side of the first section 93a.

  For example, as shown in FIG. 2, the booster circuit 11 includes a coil L1 interposed in the first section 93a, a diode D1 interposed in the forward direction on the downstream side of the coil L1 in the first section 93a, and a coil L1. A semiconductor switch (for example, an N-type MOSFET) Q1 interposed between a connection point between the diode D1 and the diode D1, and a capacitor C1 provided between the downstream side of the diode D1 and the ground point; And a control unit 26 for controlling on / off of the semiconductor switch Q1.

  In the booster circuit 11, the control unit 26 performs chopper control of the semiconductor switch Q1. When the semiconductor switch Q1 is turned on, as indicated by the arrow Ia, the power from the power source B energizes the coil L1 and the semiconductor switch Q1 and flows to the ground point. When the semiconductor switch Q1 is off, an induced electromotive force is generated by self-induction of the coil L1, and the induced electromotive force is added in series to the voltage of the power source B, whereby the power from the power source B is boosted. The boosted power is smoothed through the diode D1 and the capacitor C1 as indicated by the arrow Ib, and is output to the auxiliary machine 4 side as 48V high voltage power.

  The power connector 13 is provided at an appropriate location on the periphery of the circuit board 51 with the connection surface with the mating connector 12 facing the outer peripheral side of the circuit board 51 (see FIG. 4). The power connector 13 is configured by housing a connector terminal 13b inside a housing portion 13a. The base end portion of the connector terminal 13b protrudes outward from the rear end surface of the housing portion 13a, is bent, and is connected to the upstream end portion of the main electrical path 91 by soldering or the like.

  When the power connector 13 and the mating connector 12 are connected to each other, the connector terminals 13b and 12b come into contact with each other, and the input power from the power source B is input to the main electrical path 91 through the connector terminal 13b.

  As shown in FIG. 1, the low-voltage board 52 includes a second section 92b of the low-voltage circuit 92, a plurality of low-voltage branches 94a branched from the second section 92b, and each low-voltage branch 94a. Are provided with a plurality of fuses 23a and a low voltage auxiliary connector 16 connected across the downstream end of each low voltage branch 94a.

  When a current higher than the rated current flows through the low voltage branch 94a in which each fuse 23a is interposed, each fuse 23a interrupts the low voltage branch 94a in which it is interposed. In this embodiment, each fuse 23a is a semiconductor fuse, for example, and as shown in FIG. 3, a semiconductor switch 30 such as a field effect transistor (FET) that cuts off / conducts the low-voltage branch 94a, and a low-voltage system A current sensor 31 that detects a current flowing through the branch path 94a and a control unit 32 that performs on / off control of the semiconductor switch 30 based on a detection value of the current sensor 31 are provided.

  When the detection value of the current sensor 31 is less than the rated current value, the control unit 32 controls the semiconductor switch 30 to turn on the low-voltage branch 94a, while the detection value of the current sensor 31 Is a current value equal to or greater than the rated current value, the semiconductor switch 30 is controlled to be turned off to shut off the low-voltage branch 94a.

  The low voltage auxiliary connector 16 is provided at an appropriate position on the periphery of the low voltage board 52 with the connecting surface with the mating connector 14 facing the outer peripheral side of the low voltage board 52 (see FIG. 4). . The low voltage auxiliary connector 16 is configured by housing a plurality of connector terminals 16b inside a housing portion 16a. The base end portion of each connector terminal 16b protrudes outward from the rear end surface of the housing portion 16a, is bent, and is connected to the downstream end portion of different low-voltage system branch paths 94a by soldering or the like.

  The housing portion 16a of the low voltage auxiliary connector 16 and the housing portion 14a of the mating connector 14 are connected to each other, so that a plurality of connector terminals 16b of the low voltage auxiliary connector 16 and a plurality of connectors of the mating connector 14 are connected. The corresponding terminals 14b come into contact with each other, whereby electric power for the low voltage auxiliary machine that conducts each low voltage system branch 94a is supplied from each connector terminal 16b to each low voltage auxiliary machine 3a.

  As shown in FIG. 1, the low-voltage board 53 includes a third section 92c of the low-voltage circuit 92 and a plurality of low-voltage branches 94b branched from the third section 92c. A plurality of fuses 23b interposed in the low voltage system branch paths 94b, and a low voltage auxiliary connector 17 connected across the downstream end of each low voltage system branch path 94b are provided. .

  Each fuse 23b is a semiconductor fuse configured in the same manner as the fuse 23a. When a rated current flows through the low-voltage branch 94b interposed therein, the fuse 23b interrupts the low-voltage branch 94b interposed therein. . The low-voltage auxiliary machine connector 17 is provided on the low-voltage board 53 in the same manner as the low-voltage auxiliary machine connector 16 is provided.

  The housing portion 17a of the low voltage auxiliary connector 17 and the housing portion 15a of the mating connector 15 are connected to each other, so that a plurality of connector terminals 17b of the low voltage auxiliary connector 17 and a plurality of connectors of the mating connector 15 are connected. The corresponding terminals 15b come into contact with each other, whereby electric power for the low voltage auxiliary equipment that conducts each low voltage system branch 94b is supplied from each connector terminal 17b to each low voltage auxiliary equipment 3b.

  As shown in FIG. 1, the high-voltage board 54 includes a second section 93b of a high-voltage circuit 93, a plurality of high-voltage branches 95a branched from the second section 93b, and each high-voltage branch 95a. Are provided with a plurality of fuses 23c, and a high voltage auxiliary connector 20 connected across the downstream end of each high voltage branch 95a.

  Each fuse 23c is a semiconductor fuse configured in the same manner as the fuse 23a. When a rated current flows through the high-voltage branch 95a interposed therein, the fuse 23c interrupts the high-voltage branch 95a interposed therein. . The high voltage auxiliary connector 20 is provided on the high voltage substrate 54 in the same manner as the low voltage auxiliary connector 16 is provided.

  The housing portion 20a of the high-voltage auxiliary machine connector 20 and the housing portion 18a of the mating connector 18 are connected to each other, whereby the plurality of connector terminals 20b of the high-voltage auxiliary machine connector 20 and the plurality of connectors of the mating connector 18 are connected. The corresponding terminals 18b come into contact with each other, whereby high-voltage auxiliary power that conducts each high-voltage branch 95a is supplied from each connector terminal 20b to each high-voltage auxiliary 4a.

  As shown in FIG. 1, the high-voltage board 55 includes a third section 93c of the high-voltage circuit 93 and a plurality of high-voltage branches 95b branched from the third section 93c. A plurality of fuses 23d interposed in each high voltage system branch path 95b and a high voltage auxiliary machine connector 21 connected across each high voltage system branch path 95b are provided.

  Each fuse 23d is a semiconductor fuse configured in the same manner as the fuse 23a. When a rated current flows through the high-voltage branch 95b interposed therein, the fuse 23d interrupts the high-voltage branch 95b interposed therein. . The high-voltage auxiliary machine connector 21 is provided on the high-voltage board 55 in the same manner as the high-voltage auxiliary machine connector 20 is provided.

  The housing portion 21a of the high-voltage auxiliary machine connector 21 and the housing portion 19a of the mating connector 19 are connected to each other, whereby the plurality of connector terminals 21b of the high-voltage auxiliary connector 21 and the plurality of connectors of the mating connector 19 are connected. The corresponding terminals 19b come into contact with each other, whereby the high-voltage auxiliary power that conducts each high-voltage branch 95b is supplied from each connector terminal 21b to each high-voltage auxiliary 4b.

  The circuit board 51 and the low voltage boards 52 and 53 are connected in a circuit manner by the connection terminals 30 and 31, and the circuit board 51 and the high voltage boards 54 and 55 are connected by the connection terminals 32 and 33. Connected in circuit. Each connection terminal 30, 31, 32, 33 is, for example, a metal rod shape.

  One end of the connection terminal 30 is electrically connected to the downstream end of the first section 92 a provided on the circuit board 51, and the other end is a second section 92 b provided on the low-voltage board 52. The first section 92a and the second section 92b of the low voltage system electrical circuit 92 are connected in a circuit manner by being electrically connected to the upstream end portion of the low voltage system.

  One end of the connection terminal 31 is electrically connected to the downstream end of the second section 92 b provided on the low-voltage board 52, and the other end is provided in the third section provided on the low-voltage board 53. The second section 92b and the third section 92c of the low-voltage circuit 92 are connected in a circuit manner by being electrically connected to the upstream end of 92c.

  One end of the connection terminal 32 is electrically connected to the downstream end of the first section 93 a provided on the circuit board 51, and the other end of the connection terminal 32 is a second section 93 b provided on the high-voltage board 54. The first section 93a and the second section 93b of the high voltage system electrical circuit 93 are connected in a circuit manner by being electrically connected to the upstream end of the circuit.

  One end of the connection terminal 33 is electrically connected to the downstream end of the second section 93 b provided on the high-voltage board 54, and the other end is a third section provided on the high-voltage board 54. The second section 93b and the third section 93c of the high-voltage circuit 93 are connected in a circuit by being electrically connected to the upstream end of 93c.

  In the plurality of circuit boards 5 (51, 52, 53, 54, 55) configured as described above, 12V input power from the power source B is input to the main electric circuit 91 via the connector terminal 13b, and the input power is The current is divided into a low voltage system circuit 92 and a high voltage system circuit 93.

  And the electric power shunted to the low voltage system circuit 92 is kept at 12V, and the sections 92a, 92b and 92c of the low voltage system circuit 92 are conducted, and a plurality of low voltage systems are connected from the sections 92a, 92b and 92c. The current is diverted to the branch paths 94a and 94b and supplied from the connector terminals 14b and 15b to the low-voltage auxiliary machines 3a and 3b.

  On the other hand, the power shunted to the high voltage system circuit 93 is boosted to 48V by the booster circuit 11 provided in the first section 93a, and then is conducted to the second section 93b and the third section 93c, and each section 93b, 93c is divided into a plurality of high voltage system branch paths 95a and 95b and supplied from the connector terminals 20b and 21b to the high voltage auxiliary machines 4a and 4b.

  Therefore, both the 12V power and the 48V power are conducted to the circuit board 51, and only the 12V power on the low voltage side of the 12V power and the 48V power is conducted to each of the low voltage boards 52 and 53. Only the 48V power on the high voltage side of the 12V power and 48V power is conducted to each high voltage substrate 54, 55.

  In this electrical junction box 1, as shown in FIG. 4, each of the high-voltage boards 54, 55 through which only the 48-V power on the high-voltage side out of the 12-V power and the 48-V power is conducted The other circuit boards (that is, the circuit board 51 and the low-voltage boards 52 and 53) are separated from the high-voltage boards 54 and 55 and arranged in the housing 7 at a predetermined location S1. ing.

  More specifically, the housing 7 is formed of a resin member, for example, in a substantially rectangular parallelepiped box shape, and each of the high-voltage substrates 54 and 55 is substantially the same as the predetermined location S1 in the housing 7. In the upper half range, in other words, in the range from the upper center position in the vertical direction P <b> 1 to the upper end in the housing 7, the upper and lower layers are arranged in a vertically stacked manner with a space therebetween.

  Further, the low-voltage substrates 52 and 53 are collected and arranged at a predetermined one place S2 different from the predetermined one place S1. Specifically, each of the low-voltage substrates 52 and 53 is within a range of a substantially lower half in the casing 7, in other words, a range from a position below the center in the vertical direction P <b> 1 to the lower end in the casing 7. It is arranged in a state where it is vertically stacked with a space between each other. The circuit board 51 is disposed between the high voltage boards 54 and 55 collected at a predetermined one place S1 and the low voltage boards 52 and 53 collected at another predetermined one place S2.

  Thus, by arranging each circuit board 5 (51, 52, 53, 54, 55) in the casing 7, each circuit board is changed depending on the position of the circuit board 5 in the vertical direction P1 in the casing 7. Whether or not 5 is a high voltage substrate can be distinguished.

  It should be noted that a predetermined location (ie, in the range of the substantially upper half in the housing 7) S1 where the high-voltage boards 54 and 55 are arranged is the lowest height of the high-voltage boards 54 and 55. It is partitioned from other places in the housing 7 by the voltage board 54. That is, a predetermined range S <b> 1 is a range above the high voltage substrate 54 in the inside of the housing 7. Similarly, another predetermined position (that is, within the range of the substantially lower half in the housing 7) S2 where the low voltage substrates 52 and 53 are arranged is the first of the low voltage substrates 52 and 53. It is partitioned from other places in the housing 7 by the upper low voltage substrate 52.

  Further, the housing 7 has a plurality of openings 7a, 7b, 7c, 7d for exposing the tip portions of the connectors 13, 16, 17, 20, 21 (that is, the connecting surfaces with the mating connectors) to the outside. 7e, and a plurality of circuit boards 5 are arranged in the housing 7, and the distal ends of the connectors 13, 16, 17, 20, and 21 are opened at the openings 7a, 7b, 7c, 7d and 7e are exposed to the outside.

  As described above, according to the electrical junction box 1 according to this embodiment, the input power from the power source B does not correspond to the auxiliary machine 3 (first auxiliary machine) corresponding to the voltage of the input power and the voltage of the input power. An electric junction box for distributing to the auxiliary machine 4 (second auxiliary machine), a distribution circuit 9 for distributing input power from the power source B to the auxiliary machine 3 and the auxiliary machine 4, and an auxiliary machine by the distribution circuit 9 4 is a voltage booster circuit 11 (transformer circuit) that transforms the voltage of the input power distributed to the auxiliary machine 4 to a corresponding voltage, and a housing that forms the outer shell of the electrical junction box 1 and accommodates the distribution circuit 9 and the voltage booster circuit 11. A body 7 is provided.

  With this configuration, the input power from the power source B is distributed without transformation to the auxiliary machine 3 corresponding to the voltage of the input power, and on the other hand, to the auxiliary machine 4 not corresponding to the voltage of the input power. Is transformed into the corresponding voltage of the auxiliary machine 4 by the booster circuit 11 and distributed, so that the input power from the power source B is input to the auxiliary machine 3 corresponding to the voltage of the input power and the input in one electric junction box 1. It can be distributed to the auxiliary equipment 4 that does not correspond to the voltage of power.

  In addition, among the input power distributed to the auxiliary machine 3 and the input power transformed by the booster circuit 11, electric circuits 93b, 93c, 95a, and 95b (first electric circuit) through which the high-voltage side input power is conducted are provided. Of the input power distributed to the high voltage boards 54 and 55 and the auxiliary machine 3 and the input power transformed by the booster circuit 11, the electric paths 92b, 92c, 94a and 94b (second circuit) through which the input power on the low voltage side is conducted. And low voltage substrates 52 and 53 provided with an electric circuit).

  With this configuration, the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 can be divided into separate substrates. As a result, the safety measures against high voltage (for example, insulation measures) are performed only on the high voltage substrates 54 and 55, so that the safety measures against high voltage can be prevented from becoming complicated.

  Further, by dividing the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 into separate substrates as described above, the voltage of the high voltage substrates 54 and 55 is prevented from acting on the low voltage substrates 52 and 53. can do.

  Further, since the high voltage substrates 54 and 55 are collected and arranged at a predetermined location S1 in the housing 7, the high voltage substrates 54 and 55 can be managed separately from the low voltage substrates 52 and 53. Thereby, it can suppress that the safety measure with respect to a high voltage becomes complicated.

  Further, since the high voltage boards 54 and 55 are arranged at one place S1 in the housing 7, it is sufficient to take safety measures against the high voltage only at the one place S1, and this also complicates the safety measures against the high voltage. Can be suppressed.

  Further, since the high voltage substrates 54 and 55 are arranged at the predetermined location S1 in the housing 7, it is easy to determine whether or not the substrate is a high voltage substrate depending on the arrangement location of the substrate in the housing 7. Can be distinguished.

The low voltage substrates 52 and 53 have a relatively large amount of current compared to the high voltage substrates 54 and 55, so that a thermal problem occurs compared to the high voltage substrates 54 and 55. For this reason, the low voltage substrates 52 and 53 are heat-treated by using a metal core substrate containing a metal core. On the other hand, the high voltage substrates 54 and 55 are made of a normal PCB (Printed Circuit).
Board) and other printed circuit boards can be used. For this reason, as described above, the high voltage substrates 54 and 55 are arranged at the predetermined location S1 in the housing 7 and the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 are managed separately. A suitable substrate (metacore substrate or PCB substrate) can be used for the high-voltage substrates 54 and 55 and the low-voltage substrates 52 and 53, and cost reduction can be achieved.

  In addition, as described above, the high voltage substrates 54 and 55 are limited to the predetermined location S1 in the housing 7, and the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 are separately arranged, Mixing of the voltage boards 54 and 55 and the low voltage boards 52 and 53 can be eliminated, and the board arrangement space in the housing 7 can be made compact. That is, when the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 are adjacent to each other, it is necessary to ensure a relatively large distance between them, but the low voltage substrates 52 and 53 or the high voltage substrates 54 and 55 are When they are adjacent to each other, the distance between them can be made relatively small. For this reason, as described above, the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 are arranged separately to avoid the high voltage substrates 54 and 55 and the low voltage substrates 52 and 53 being adjacent to each other. Thus, the board arrangement space in the housing 7 can be made compact compared to the case where the low voltage boards 52 and 53 and the high voltage boards 54 and 55 are mixed.

  In addition, the predetermined one place S1 where the high voltage substrates 54 and 55 are arranged is in a substantially upper half range in the casing 7, in other words, the center in the vertical direction P1 (first direction) in the casing 7. It is set within a range (first range) from the upper position (first position) to the upper end (one end in the first direction).

  With this configuration, the high-voltage boards 54 and 55 can be disposed so as to be limited to the upper half of the housing 7. As a result, safety measures against high voltage can be limited to a substantially upper half range in the housing 7, and complication of safety measures against high voltage can be suppressed. In addition, by setting the predetermined one place S1 in this way, the boundary with the adjacent space in the predetermined one place S1 can be limited to one surface (that is, the lower side of the predetermined one place S1). Complicating safety measures against voltage can be suppressed.

  Hereinafter, modifications of the above embodiment will be described.

(Modification 1)
In the above-described embodiment, the predetermined one place S1 focuses on the upper surface of the six outer surfaces of the substantially rectangular parallelepiped casing 7, and is within the upper half of the casing 7 (that is, the approximately rectangular parallelepiped casing). The upper surface of the six surfaces of the body 7 and the upper surface side half of the four side surfaces adjacent to the upper surface). Paying attention to one surface, the predetermined one place S1 is within the range of approximately half of the one surface side of the housing 7 (that is, one surface other than the upper surface of the six surfaces of the housing 7 and four surfaces adjacent to the one surface). It may be set within a range surrounded by each half on the one surface side.

(Modification 2)
Further, as shown in FIG. 5, the predetermined one place S <b> 1 is set to a range (first range) Sa in a substantially upper half of the vertical direction P <b> 1 in the casing 7 and a horizontal direction orthogonal to the vertical direction P <b> 1 in the casing 7. A range of one half of the direction P2 (second direction) (in other words, a range from the center position (second position) in the horizontal direction P2 to one end of the horizontal direction P2 (second range)) in the housing 7 Sb May be set within the common range.

  In the example shown in FIG. 5, the horizontal direction P <b> 2 faces the direction orthogonal to the pair of opposing side surfaces of the housing 7 in the direction orthogonal to the vertical direction P <b> 1. That is, the second range Sb focuses on one side surface among the four side surfaces adjacent to the upper surface of the housing 7, and is the range of the half on the one side surface side in the housing 7.

  In this way, the predetermined one place S1 is set within a common range of the range Sa of the substantially upper half in the vertical direction P1 in the casing 7 and the range Sb of the half on the one side in the horizontal direction P2 in the casing 7. Thus, since it can be limited to a range smaller than the range of the substantially upper half in the housing 7, it is possible to further suppress the complication of safety measures against high voltage.

(Modification 3)
Further, in the above embodiment, the predetermined one place S1 in the housing 7 is partitioned from the other places in the housing 7 by the existing high voltage board 54, but instead of the existing high voltage board 54. You may partition predetermined one place S1 from the other place in the housing | casing 7 using an additional insulating board. Similarly, another predetermined one place S <b> 2 may be partitioned from another place in the housing 7 by using an additional insulating plate instead of the existing low voltage substrate 52.

(Modification 4)
In the above embodiment, the voltage of the power source B is 12V, the auxiliary machine 3 is a low voltage auxiliary machine compatible with 12V, and the auxiliary machine 4 is a high voltage auxiliary machine compatible with 48V. In the above description, the 12V input power from the power source B is distributed to the 12V auxiliary machine 3, and the input power is boosted to 48V and distributed to the 48V auxiliary machine 4. The voltage and the corresponding voltage of each auxiliary machine 3 and 4 are not limited to such values.

  For example, the voltage of the power supply B is set to 48V, and the input power of 48V from the power supply B is distributed to the 48V compatible auxiliary device 4, and the input power is stepped down to 12V and distributed to the 12V compatible auxiliary device 3. Also good. As shown in FIG. 6, the electrical junction box 1 in this case omits the step-up circuit 11 in the above embodiment (see FIG. 1), and instead of the step-up circuit 11, the step-down stepping down 48V power to 12V power. The circuit 40 is interposed in the first section 92 a of the low voltage circuit 92.

  In this case, as shown in FIG. 7, for example, the step-down circuit 40 is interposed in the first section 92a of the low-voltage system circuit 92, and the semiconductor switch Q2 (time-division-controlling the power conducted to the first section 92a ( Switching element) and a smoothing circuit 42 that is interposed downstream of the semiconductor switch Q2 in the first section 92a and smoothes the power that is time-division controlled by the semiconductor switch Q2.

  The smoothing circuit 42 is interposed in the reverse direction between the coil L2 interposed downstream of the semiconductor switch Q2 in the first section 92a and the connection point between the semiconductor switch Q2 and the coil L2 and the grounding point. A diode D2, a capacitor C2 interposed between the downstream side of the coil L2 and the ground point, and a control unit 27 for controlling on / off of the semiconductor switch Q2.

  In this step-down circuit 40, the control unit 27 performs chopper control of the semiconductor switch Q2, so that the 48V input power from the power source B is time-division controlled by the semiconductor switch Q2, and the time-division controlled input power is converted to the smoothing circuit 42. Is stepped down to 12V power and output to the auxiliary machine 3 side.

(Modification 5)
In Modification 4, a semiconductor fuse (for example, a semiconductor fuse of the same type as the semiconductor fuse 23 shown in FIG. 3) may be used as the semiconductor switch Q2. In this case, when the detection value of the current sensor in the semiconductor fuse is a current value less than the rated current value (predetermined current value) set in the first section 92a, the control unit in the semiconductor fuse By performing chopper control of the semiconductor switch in the semiconductor fuse based on the control of the control unit 27, the power conducted to the first section 92a is time-division controlled. On the other hand, when the detected value of the current sensor in the semiconductor fuse is a current value equal to or higher than the rated current value, the control unit in the semiconductor fuse controls the semiconductor switch in the semiconductor fuse to turn off to block the first section 92a. .

  Thus, by using a semiconductor fuse as the semiconductor switch Q2 in the step-down circuit 40, the semiconductor switch can be shared between the step-down circuit 40 and the semiconductor fuse. Thereby, the number of semiconductor switches in the electrical junction box 1 can be reduced, and a control system for controlling the semiconductor switches can be simplified.

(Modification 6)
As shown in FIG. 8, this modification 6 includes a step-up / step-down circuit 100 instead of the booster circuit 11 in the above embodiment, so that DC power is input from both the 12V power supply BL and the 48V power supply BH, To the low-voltage auxiliary machine 3, 12V input power from the 12V power supply BL is supplied without being transformed, and 48V input power from the 48V power supply BH is stepped down to 12V by the step-up / down circuit 100, and supplied. Further, 48V input power from the 48V power source BH is supplied to the high voltage auxiliary machine 4 without being transformed, and 12V input power from the 12V power source BL is boosted to 48V by the step-up / down circuit 100 and supplied. It is what you do.

  In this modified example 6, as shown in FIG. 8, the circuit board 51 includes a low-voltage main circuit 91L for inputting input power from the 12V power supply BL and a low-voltage system circuit 92 branched from the main circuit 91L. The first section 92a, the high-voltage main circuit 91H for inputting the input power from the 48V power supply BH, the first section 93a of the high-voltage circuit 93 branched from the main circuit 91H, the main circuit 91L, and the main circuit 91H 12V power supply connector 13L that is connected to the mating connector 12L that is connected to the relay electric circuit 96, the main electric circuit 91L, and the electric wire WL from the 12V power supply BL, and the main electric circuit 91H. In addition, a 48V power supply connector 13H connected to the mating connector 12H to which the electric wire WH from the 48V power supply BH is connected is provided.

  The downstream end of the main electric circuit 91L is electrically connected to the second section 92b of the low voltage circuit 92 of the low voltage substrate 52 via the connection terminal 30, and the downstream end of the main electric circuit 91H is It is electrically connected to the second section 93 b of the high voltage circuit 93 of the high and low voltage substrate 54 via the connection terminal 32.

  In addition, a step-up / down circuit 100 is interposed in the relay circuit 96. When a current greater than or equal to the rated current flows through the main electric circuit 91L, a fusing fuse 101 that interrupts the main electric circuit 91L is interposed in the main electric circuit 91L, and the first section 92a of the low voltage system electric circuit 92 includes the first section 92a. When a current equal to or higher than the rated current flows through the semiconductor fuse 102, a semiconductor fuse 102 that interrupts the first section 92a is interposed. Similarly, when a current higher than the rated current flows through the main electric circuit 91H, a fusing fuse 103 that interrupts the main electric circuit 91H is interposed in the main electric circuit 91H, and the first section 93a of the high voltage system electric circuit 93 includes When a current equal to or higher than the rated current flows in one section 93a, a semiconductor fuse 104 that interrupts the first section 93a is interposed.

  In this modification, 12V input power input from the 12V power supply BL to the main circuit 91L of the circuit board 51 is transferred from the first section 92a of the low voltage system circuit 92 to the sections 92b and 92c of the low voltage boards 52 and 53. They are sequentially conducted and supplied to the low voltage auxiliary machines 3a and 3b from the low voltage system branch paths 94a and 94b branched from the sections 92b and 92c. Further, the 12V input power input to the main circuit 91L is shunted to the relay circuit 100 as necessary, for example, when the power from the 48V power source BH is insufficient, and is boosted to 48V by the step-up / down circuit 100. After that, the first voltage 93 is electrically connected to the sections 93b and 93c of the high-voltage boards 54 and 55 in order from the first section 93a of the high-voltage circuit 93, and the high-voltage branches 95a and 95b branched from the sections 93b and 93c. The voltage is supplied to the voltage auxiliary machines 4a and 4b.

  Similarly, the 48V input power input from the 48V power source BH to the main circuit 91H of the circuit board 51 is sequentially conducted from the first section 93a of the high voltage system circuit 93 to the sections 93b and 93c of the high voltage boards 54 and 55. And it is supplied to each high-voltage auxiliary machine 4a, 4b from each high-voltage system branch path 95a, 95b branched from each section 93b, 93c. Also, the 48V input power input to the main circuit 91H is shunted to the relay circuit 100 as necessary, for example, when the power from the 12V power supply BL is insufficient, and is stepped down to 12V by the step-up / down circuit 100. Thereafter, the low voltage system circuit 92 is sequentially conducted from the first section 92a of the low voltage circuit 92 to the sections 92b and 92c of the low voltage substrates 52 and 53, and the low voltage system branches 94a and 94b branched from the sections 92b and 92c. The voltage is supplied to the voltage auxiliary machines 3a and 3b.

(Modification 7)
Further, in the above embodiment, the low voltage electric wires W2, W3 (first electric wires) for supplying the electric power distributed to the low voltage auxiliary machine 3 by the distribution circuit 9 from the low voltage substrates 52, 53 to the low voltage auxiliary machine 3. ) And a high voltage for supplying the power distributed to the high voltage auxiliary machine 4 by the distribution circuit 9 and boosted by the booster circuit 11 from the high voltage substrates 54 and 55 to the high voltage auxiliary machines 4a and 4b. As a method of drawing out the electric wires W4 and W5 (second electric wires) from the inside of the housing 7 to the outside, the method shown in FIG. 9 may be adopted.

  That is, the housing 7 is provided with a first opening 70 for a low-voltage electric wire and a second opening 71 for a high-voltage electric wire, and the low-voltage electric wires W2 and W3 are bundled through the first opening 70. The body 7 is pulled out from the inside, and on the other hand, the high-voltage electric wires W4 and W5 are bundled and pulled out from the inside of the housing 7 through the second opening 71.

  By doing in this way, since high voltage electric wires and low voltage electric wires can be bundled separately and pulled out from the housing 7, the high voltage electric wires and the low voltage electric wires can be easily distinguished from each other. Safety measures for voltage wires can be appropriately taken. Further, it is determined whether the electric wire drawn out from the inside of the housing 7 is a low-voltage electric wire or a high-voltage electric wire, which opening portion (that is, the first opening portion 70 and the second opening portion 71). It can be easily distinguished depending on whether it is pulled out from.

  In addition, the first opening 70 may be provided at a predetermined location of the housing 7 (for example, the location corresponding to the location where the high voltage substrates 54 and 55 are disposed), and the second opening 71 is provided in the housing 7 described above. You may provide in places other than a predetermined place (for example, the place corresponding to the place where the low voltage board | substrates 52 and 53 are arrange | positioned). Thereby, whether the electric wire pulled out from the first opening 70 and the second opening 71 is a high-voltage electric wire or a low-voltage electric wire depending on the arrangement location of the first opening 70 and the second opening 71. Can be determined.

(Modification 8)
In the fifth modification, the shape of the opening surface of the first opening 70 may be different from the shape of the opening surface of the second opening 71. For example, as shown in FIG. 10, the shape of the opening surface of the first opening 70 may be circular, and the shape of the opening surface of the second opening 71 may be rectangular.

  By doing in this way, it can be distinguished easily whether the said electric wire is a high voltage electric wire or a low voltage electric wire by the shape of the opening part from which an electric wire (a 1st electric wire or a 2nd electric wire) is pulled out.

(Modification 9)
Moreover, in said embodiment, the color or pattern of the outer peripheral surface of the low voltage electric wires W2, W3 (first electric wire) is made different from the color or pattern of the outer peripheral surface of the high voltage electric wires W4, W5 (second electric wire). Also good.
For example, the color of the outer peripheral surface of the low voltage electric wires W2, W3 may be black, and the color of the outer peripheral surface of the high voltage electric wires W4, W5 may be red. Further, the pattern on the outer peripheral surface of the low-voltage electric wires W2, W3 is, for example, a pattern in which a yellow line M2 is drawn on a black background M1 as shown in FIG. For example, as shown in FIG. 11B, a pattern in which a yellow spiral line M4 is drawn on a black background M3 may be used.
Thereby, it can be distinguished easily whether the said electric wire is a high voltage electric wire or a low voltage electric wire by the color or pattern of the outer peripheral surface of an electric wire.

(Modification 10)
Moreover, in said embodiment, the coating | coated part of the high voltage electric wires W4 and W5 (the electric wire in which relatively high voltage power is conducted among the first electric wire and the second electric wire) is the low voltage electric wires W2, W3 ( It may be formed thicker than the covering portion of the first electric wire and the second electric wire which has a relatively low voltage electric power. Thereby, the short circuit of the high voltage electric wires W4 and W5 can be suppressed.

(Modification 11)
In the above embodiment, the power connector 13 and the booster circuit 11 for inputting the input power from the power source B are provided on the circuit board 51. However, the arrangement locations of the power connector 13 and the booster circuit 11 are as follows. It is not so limited. For example, the locations of the power connector 13 and the booster circuit 11 may be changed to locations shown in any of FIGS.

In the example shown in FIG. 12, the power connector 13 is provided on the circuit board 51 as in the above embodiment, and the booster circuit 11 is provided on the high voltage board 54 instead of being provided on the circuit board 51. In this case, the booster circuit 11 is interposed near the upstream end of the second section 93 b of the high voltage circuit 93 provided on the high voltage board 54.
In this case, since the low voltage power of 12V is conducted upstream of the booster circuit 11 in the second section 93b, the low voltage power is conducted to the high voltage substrate 54 provided with the booster circuit 11. A part of the electric circuit will be included.

In the example shown in FIG. 13, the circuit board 51 is omitted, the power connector 13 is provided on the low voltage board 52, and the booster circuit 11 is provided on the high voltage board 54.
In this case, the booster circuit 11 is interposed near the upstream end of the second section 93 b of the high voltage circuit 93 provided on the high voltage board 54. The first section 92 a of the main electric circuit 91 and the low voltage system circuit 92 and the first section 93 a of the high voltage system circuit 93 are provided on the low voltage substrate 52 together with the power connector 13.

In the example shown in FIG. 14, the power connector 13 is provided on the low voltage board 52 instead of being provided on the circuit board 51, and the booster circuit 11 is provided on the circuit board 51 as in the above embodiment. In this case, the upstream portion of the main circuit 91, the first section 92a of the low voltage system circuit 92, and the first section 93a of the high voltage system circuit 93 from the booster circuit 11 together with the power connector 13 is a low voltage board. 52.
Note that reference numeral 35 in FIG. 14 is a connection terminal for electrically connecting the upstream portion of the booster circuit 11 and the upstream portion of the booster circuit 11 in the first section 93a.

In the example shown in FIG. 15, the circuit board 51 is omitted, and the power connector 13 and the booster circuit 11 are provided on the low-voltage board 52. In this case, the main circuit 91, the first section 92 a of the low voltage system circuit 92, and the first section 93 a of the high voltage system circuit 93 are provided on the low voltage substrate 52 together with the power connector 13 and the booster circuit 11.
In this case, the high voltage power of 48V is conducted on the downstream side of the booster circuit 11 in the first section 93a. Therefore, the low voltage substrate 52 provided with the booster circuit 11 has an electric circuit through which the high voltage power is conducted. Will be included in part.

(Modification 12)
In the above embodiment, the voltage of the power supply B is set to 12V, and the 12V power from the power supply B is distributed to the auxiliary equipment 3 compatible with 12V and the auxiliary equipment 4 compatible with 48V. Is 24V (or 36V), and 24V power from the power supply B is stepped down to 12V and distributed to the 12V auxiliary machine 3, and is boosted to 48V and distributed to the 48V auxiliary machine 4. May be.

  In addition, this invention is not limited only to the structure of the above-mentioned embodiment, Many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Electric junction box 3 ... Low voltage auxiliary machine 4 ... High voltage auxiliary machine 5 ... Circuit board 7 ... Case 9 ... Distribution circuit 11 ... Booster circuit 23 ... Semiconductor fuse 42 ... Smoothing circuit 50 ... 1st opening part 51 ... 1st 2 openings 52, 53 ... low-voltage board 54, 55 ... high-voltage board S1 ... one predetermined place in the housing Q2 ... semiconductor switch W2, W3 ... low-voltage wire W4, W5 ... high-voltage wire

Claims (10)

An electrical junction box for distributing input power from a power source to a first auxiliary machine corresponding to the voltage of the input power and a second auxiliary machine not corresponding to the voltage of the input power,
A distribution circuit for distributing the input power from the power source to the first auxiliary machine and the second auxiliary machine;
A transformer circuit that transforms the voltage of the input power distributed to the second auxiliary machine by the distribution circuit into a corresponding voltage of the second auxiliary machine;
An electrical junction box comprising an outer shell of the electrical junction box and a housing for accommodating the distribution circuit and the transformer circuit. Among the input power distributed to the first auxiliary machine and the input power transformed by the transformer circuit, a high voltage board provided with a first electric circuit through which high voltage side input power is conducted,
A low voltage board provided with a second electric circuit through which the input power on the low voltage side of the input power distributed to the first auxiliary machine and the input power transformed by the transformer circuit is provided; The electrical junction box according to claim 1. The electrical connection box according to claim 2, wherein the high voltage substrates are collected and arranged at a predetermined location in the housing. The electrical junction box according to claim 3, wherein the predetermined portion is within a first range from a first position in the first direction to one end in the first direction inside the housing. The predetermined portion is a common range between the second range from the second position on the second direction orthogonal to the first direction to one end in the second direction and the first range inside the housing. The electrical junction box according to claim 4. The transformer circuit is:
A switch element that is interposed in an electrical path through which the input power from the power source is conducted, and that controls the input power through the electrical path in a time-sharing manner;
A smoothing circuit that is interposed downstream of the switch element in the electrical path and smoothes the input power that is time-division controlled by the switch element;
The switch element is a semiconductor fuse,
A current sensor for detecting a current flowing in the electric circuit;
A semiconductor switch interposed in the electric circuit;
When the detected value of the current sensor is less than a predetermined current value, the semiconductor switch is chopper controlled to time-control the input power conducted to the electric circuit, and the detected value of the current sensor is predetermined. The electrical connection box according to claim 1, further comprising: a control unit configured to control the semiconductor switch to be turned off and to cut off the electric circuit when the current value is equal to or greater than the current value. A first electric wire for supplying the input power distributed to the first auxiliary machine by the distribution circuit to the first auxiliary machine;
A second electric wire for supplying the input power transformed by the transformer circuit to the second auxiliary machine,
In the case,
A first opening for bundling the first electric wires and pulling them out from the inside of the housing;
The electrical junction box according to one of claims 1 to 6, further comprising a second opening for bundling the second electric wires and pulling the second electric wires from the inside of the housing to the outside. The electrical connection box according to claim 7, wherein the shape of the opening surface of the first opening is different from the shape of the opening surface of the second opening. The electrical connection box according to claim 7 or 8, wherein the color or pattern of the outer peripheral surface of the first electric wire is different from the color or pattern of the outer peripheral surface of the second electric wire. The first electric wire and the second electric wire have a core wire and a covering portion that covers the core wire,
Of the first electric wire and the second electric wire, the covering portion of the electric wire that conducts relatively high-voltage power is more than the covering portion of the electric wire that conducts relatively low-voltage electric power. The electrical junction box according to claim 7, wherein the electrical junction box is formed thick.

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