JP2022088893A - Power control device and power control system - Google Patents

Abstract

To downsize a power control device.SOLUTION: A power control device 1 includes a power conduction passage (e.g., a first power conduction passage 81A and 81B), SMRs 10 and 11, a power conversion unit 12, a control unit 18, and a substrate 60. The power conduction passage serves as a part of a route for supplying power to a driving unit from a high-voltage battery. The SMRs 10 and 11 are interposed in the power conduction passage, and are switched between a permission state for permitting power supply from a high-voltage battery 90 side to a driving unit 91 side, and a cut-off state for cutting off the power supply. The power conversion unit 12 converts the power supplied by the power conduction passage. The control unit 18 controls the SMRs 10 and 11, and the power conversion unit 12. The power conversion unit 12 and the control unit 18 are installed on the substrate 60. The power conduction passage and the SMRs 10 and 11 are also installed on the substrate 60.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a power control device and a power control system.

Patent Document 1 discloses a main battery unit including a system main relay (SMR) and a power conversion unit (MS converter). The system main relay (SMR) and the power conversion unit (MS converter) are controlled by the control unit (ECU). This kind of technique is also disclosed in Patent Documents 2 to 4.

Japanese Unexamined Patent Publication No. 2018-11480 Japanese Unexamined Patent Publication No. 2007-295699 Japanese Patent Application Laid-Open No. 2003-61209 Japanese Unexamined Patent Publication No. 5-344607

It is desired that the power control device including the system main relay, the power conversion unit, and the control unit described above be miniaturized.

Therefore, an object of the present disclosure is to reduce the size of the power control device.

The power control device of the present disclosure is
Conductive paths that form part of the path that supplies power from the high-voltage battery to the drive unit,
A system main relay that is interposed in the conductive path and switches between an allowable state that allows power supply from the high-voltage battery side to the drive unit side and a cutoff state that cuts off the power supply.
A power conversion unit that converts the power supplied by the conductive path, and
A control unit that controls the system main relay and the power conversion unit,
The board on which the power conversion unit and the control unit are installed,
Equipped with
The conductive path and the system main relay are installed on the substrate.

According to the present disclosure, the power control device can be miniaturized.

FIG. 1 is a circuit diagram schematically showing the configuration of the power control system of the first embodiment. FIG. 2 is a plan view schematically showing the power control device of the first embodiment. FIG. 3 is a side view schematically showing the power control device of the first embodiment. FIG. 4 is a circuit diagram schematically showing the configuration of the power control system of the second embodiment. FIG. 5 is a circuit diagram schematically showing the configuration of the power control system of the third embodiment.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.

[1] A conductive path that forms part of the path for supplying electric power from the high-voltage battery to the drive unit, and an allowable state that is interposed in the conductive path to allow power supply from the high-voltage battery side to the drive unit side. A system main relay that switches to a cutoff state, a power conversion unit that converts the power supplied by the conductive path, a control unit that controls the system main relay and the power conversion unit, the power conversion unit, and the power conversion unit. A power control device including a substrate on which a control unit is installed, on which the conductive path and the system main relay are installed.

According to this configuration, the conductive path and the system main relay are integrated on the substrate on which the power conversion unit and the control unit are installed. Therefore, the power control device can be miniaturized.

[2] The substrate has a first region having a plurality of first conductive layers and a second region having a second conductive layer that is thicker than the first conductive layer and includes the conductive path. The power control device according to [1], wherein the system main relay and the power conversion unit are electrically connected to the control unit via the first conductive layer.

According to this configuration, a configuration in which a configuration for controlling the power conversion unit and a configuration for blocking a large current flowing in the conductive path by a system main relay are integrated is realized while suppressing the increase in size of the power control device. be able to.

[3] The drive unit has a capacitor, and the control unit charges the capacitor by the power conversion unit before switching the system main relay from the cutoff state to the allowable state. The power control device according to [1] or [2], wherein the system main relay is switched to the allowable state after the precharge operation.

According to this configuration, a series of processes for charging the capacitor of the drive unit by the precharge operation and then switching the system main relay to the allowable state can be self-completed only by the control unit that controls the power conversion unit.

[4] A voltage detection unit for detecting a voltage on the drive unit side of the conduction path on the drive unit side of the system main relay is provided, and the control unit installs the power conversion unit based on the voltage detected by the voltage detection unit. The power control device according to any one of [1] to [3] to be controlled.

According to this configuration, the electric power can be converted by the electric power conversion unit by using the voltage of the path for supplying electric power to the drive unit via the system main relay.

[5] The power control device according to any one of [1] to [4], wherein the control unit switches the system main relay to the cutoff state when a predetermined abnormality occurs.

According to this configuration, the power supply from the high voltage battery can be cut off in the event of an abnormality.

[6] A voltage detection unit that detects a voltage on the drive unit side of the system main relay in the conductive path, and a high voltage side voltage detection unit that detects a voltage input from the high voltage battery side to the power conversion unit. The control unit detects an abnormality based on the difference between the voltage detected by the voltage detection unit and the voltage detected by the high voltage side voltage detection unit [1] to [5]. The power control device according to paragraph 1.

According to this configuration, an abnormality can be detected based on the difference between the voltage of the path for supplying power to the drive unit via the system main relay and the voltage input from the high voltage battery side to the power conversion unit.

[7] The power control device according to any one of [1] to [6] and an external control device provided outside the power control device are provided, and the external control device is the system main relay. Power control system to control.

According to this configuration, the system main relay can also be controlled by an external control device.

<First Embodiment>
[Power control system configuration]
FIG. 1 shows a power control system 100 including the power control device 1 of the first embodiment. The power control system 100 is configured as an in-vehicle power control system. The power control system 100 is mounted on a vehicle such as a PHEV (Plug-in Hybrid Electric Vehicle) or an EV (Electric Vehicle). The power control system 100 includes a high-voltage battery 90, a drive unit 91, a high-voltage load 92, a low-voltage battery 93, and a low-voltage load 94.

The high-voltage battery 90 may be composed of a secondary battery such as a lithium ion battery, or may be composed of other types of storage batteries. The high-voltage battery 90 functions as a power source for supplying electric power to the drive unit 91 and the high-voltage load 92. The terminals on the high potential side of the high voltage battery 90 are electrically connected to the first conductive path 81A of the pair of first conductive paths 81A and 81B, and the terminals on the low potential side of the high voltage battery 90 are the ground and the first. 1 It is electrically connected to the conductive path 81B. A predetermined voltage (for example, about 300 V) is applied to the first conductive path 81A when the high voltage battery 90 is fully charged. The output voltage when the high-voltage battery 90 is fully charged is higher than the output voltage when the low-voltage battery 93 is fully charged.

The drive unit 91 is supplied with electric power from the high-voltage battery 90 via the pair of first conductive paths 81A and 81B and the pair of second conductive paths 82A and 82B. The pair of second conductive paths 82A and 82B are arranged closer to the drive unit 91 than the pair of first conductive paths 81A and 81B. The drive unit 91 is a device that gives a driving force for rotating the wheels of the vehicle based on the electric power supplied from the high-voltage battery 90. The drive unit 91 has an inverter 95 and a motor 96. The inverter 95 is arranged between the high voltage battery 90 and the motor 96. The inverter 95 has switch elements 95A, 95B, 95C, 95D, 95E, 95F and a capacitor 97. As the switch elements 95A, 95B, 95C, 95D, 95E, 95F, various known switch elements can be used, but it is preferable to use an N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The switch elements 95A, 95B, 95C, 95D, 95E, 95F form a full bridge circuit having three upper and lower arms. The capacitor 97 is arranged on the high voltage battery 90 side of the capacitor 97. More specifically, the capacitor 97 is arranged on the high voltage battery 90 side of the switch elements 95A, 95B, 95C, 95D, 95E, 95F. A voltage based on the output from the high voltage battery 90 is applied to both electrodes of the capacitor 97. The inverter 95 smoothes the DC power supplied from the high-voltage battery 90 side by the capacitor 97, and generates the three-phase AC power by the switch elements 95A, 95B, 95C, 95D, 95E, 95F, and the generated three-phase AC power. Is supplied to the motor 96. The motor 96 provides a driving force for rotating the wheels of the vehicle based on the three-phase AC electric power supplied from the inverter 95.

The high voltage load 92 is a load to which a high voltage is applied. The high-voltage load 92 may be, for example, an air conditioner, a heater, or the like, or may be a load other than these. The high voltage applied to the high voltage load 92 is, for example, about 300 V, which is higher than the low voltage applied to the low voltage load 94. The high-voltage load 92 is supplied with power from the high-voltage battery 90 via the pair of first conductive paths 81A and 81B and the pair of third conductive paths 83A and 83B. The pair of third conductive paths 83A and 83B are arranged on the high voltage load 92 side of the pair of first conductive paths 81A and 81B.

The low-voltage battery 93 may be composed of a secondary battery such as a lead storage battery, or may be composed of other types of storage batteries. A power control device 1 is arranged between the low-voltage battery 93 and the high-voltage battery 90. The electric power from the high voltage battery 90 is converted and supplied to the low voltage battery 93 by the power control device 1. The terminal on the high potential side of the low voltage battery 93 is electrically connected to the fifth conductive path 85, and the terminal on the low potential side of the low voltage battery 93 is electrically connected to the ground. The low voltage battery 93 applies a predetermined voltage (for example, 12V) to the fifth conductive path 85 when fully charged.

The low pressure load 94 includes the accessories necessary to drive the engine and the motor. For example, the accessory equipment is mainly a starter motor, an alternator, a radiator cooling fan, and the like. The low voltage load 94 may include an electric power steering system, an electric parking brake, lighting, a wiper drive unit, a navigation device, and the like. Further, the low-pressure load 94 may include a load for automatic driving such as a sensing system such as a millimeter-wave radar or a stereo camera, a speed control system, an inter-vehicle distance control system, a steering control system, and a lane departure prevention support system. good. The low-voltage load 94 is electrically connected to the fifth conductive path 85, and is supplied with power from the low-voltage battery 93 via the fifth conductive path 85.

The power control device 1 includes system main relays 10 and 11 (hereinafter, also referred to as SMRs 10 and 11), a power conversion unit 12, a voltage detection unit 13, a low voltage side voltage detection unit 14, a current detection unit 15, and a high voltage side current detection unit 16. , A fuse 17, a control unit 18, a pair of first conductive paths 81A, 81B and a pair of fourth conductive paths 84A, 84B. In this embodiment, the pair of first conductive paths 81A and 81B correspond to "conductive paths".

The pair of first conductive paths 81A and 81B are arranged between the high-voltage battery 90 and the drive unit 91, and form a part of a path for supplying electric power from the high-voltage battery 90 to the drive unit 91. The SMR 10 is interposed in the first conductive path 81A, and the SMR 11 is interposed in the first conductive path 81B.

The SMRs 10 and 11 are configured as, for example, mechanical relays. The SMRs 10 and 11 are controlled by the control unit 18 and are switched between an allowable state in which power supply from the high-voltage battery 90 side to the drive unit 91 side is allowed and a cutoff state in which the power is cut off.

The first conductive path 81A has a primary side first conductive path 81AA arranged on the high voltage battery 90 side of the SMR 10 and a secondary side first conductive path 81AB arranged on the drive unit 91 side of the SMR 10. is doing. The primary side first conductive path 81AA and the secondary side first conductive path 81AB are arranged so as to be spaced apart from each other. The terminal on the primary side of the SMR 10 is connected to the primary side first conductive path 81AA, and the terminal on the secondary side of the SMR 10 is connected to the secondary side first conductive path 81AB. The primary side first conductive path 81AA and the secondary side first conductive path 81AB are connected when the SMR 10 is in the allowable state, and are disconnected when the SMR 10 is in the cutoff state. The first conductive path 81B has a primary side first conductive path 81BA arranged on the high voltage battery 90 side of the SMR 11 and a secondary side first conductive path 81BB arranged on the drive unit 91 side of the SMR 11. is doing. The primary side first conductive path 81BA and the secondary side first conductive path 81BB are arranged at intervals from each other. The terminal on the primary side of the SMR 11 is connected to the first conductive path 81BA on the primary side, and the terminal on the secondary side of the SMR 11 is connected to the first conductive path 81BB on the secondary side. The primary side first conductive path 81BA and the secondary side first conductive path 81BB are connected when the SMR 11 is in the allowable state, and are disconnected when the SMR 11 is in the cutoff state. The terminal on the high potential side of the high voltage battery 90 is electrically connected to the primary side first conductive path 81AA, and a voltage based on the output voltage of the high voltage battery 90 is applied. The terminal on the low potential side of the high voltage battery 90 is electrically connected to the primary side first conductive path 81BA.

The power conversion unit 12 is electrically connected to the first conductive paths 81A, 81B, more specifically, the secondary side first conductive paths 81AB, 81BB via the fourth conductive paths 84A, 84B. The power conversion unit 12 can convert the power supplied by the first conductive paths 81A and 81B. The power conversion unit 12 is configured as, for example, a DCDC converter, and more specifically, as an isolated DCDC converter. The power conversion unit 12 is electrically connected to the low voltage battery 93 and the low voltage load 94 via the fifth conductive path 85. A voltage based on the output voltage of the high voltage battery 90 is applied to the fourth conductive path 84A. The power conversion unit 12 performs a step-down operation in which the voltage applied to the fourth conductive path 84A is stepped down and applied to the fifth conductive path 85. Further, the power conversion unit 12 boosts the voltage applied to the fifth conductive path 85 and applies the voltage to the fourth conductive path 84A.

The power conversion unit 12 has a transformer 20, a primary circuit 30, and a secondary circuit 40.

The transformer 20 has a primary coil 21 and secondary coils 22A and 22B. The number of turns of the primary coil 21 is N1. The number of turns of the secondary coil 22A and 22B are both N2. The secondary coils 22A and 22B are electrically connected in series with each other at the third connection point P3. The turns ratio N of the transformer 20 is represented by N1 / N2.

The primary side circuit 30 includes a first switch element 30A, a second switch element 30B, a third switch element 30C, a fourth switch element 30D (hereinafter, also referred to as switch elements 30A, 30B, 30C, 30D), and a primary side capacitor 30E. have. Various known switch elements can be used for the switch elements 30A, 30B, 30C, and 30D, but it is preferable to use an N-channel MOSFET. The switch elements 30A, 30B, 30C, and 30D are configured to be fully bridged. The first switch element 30A and the second switch element 30B are connected in series between the pair of fourth conductive paths 84A and 84B, and are electrically connected to each other at the first connection point P1. The third switch element 30C and the fourth switch element 30D are connected in series between the pair of fourth conductive paths 84A and 84B, and are electrically connected to each other at the second connection point P2. One end of the primary coil 21 is electrically connected to the first connection point P1, and the other end of the primary coil 21 is electrically connected to the second connection point P2. The primary side capacitor 30E is arranged on the high voltage battery 90 side of the primary side circuit 30. The primary side circuit 30 smoothes the input voltage, which is a DC voltage applied to the fourth conductive paths 84A, 84B, by the primary side capacitor 30E, converts it into alternating current by the switch elements 30A, 30B, 30C, 30D, and converts the transformer 20 into alternating current. It is supplied to the primary coil 21.

The secondary circuit 40 rectifies and smoothes the AC voltage appearing in the secondary coils 22A and 22B of the transformer 20 to generate an output voltage which is a DC voltage, and applies this output voltage to the fifth conductive path 85. The secondary side circuit 40 has a fifth switch element 40A, a sixth switch element 40B, a rectified output path 40C, a choke coil 43, and a secondary side capacitor 44. Various known switch elements can be used for the fifth switch element 40A and the sixth switch element 40B, but it is preferable to use an N-channel MOSFET. The drain of the fifth switch element 40A is electrically connected to one end of the secondary coil 22A, and the source of the fifth switch element 40A is electrically connected to the ground. The drain of the sixth switch element 40B is electrically connected to one end of the secondary coil 22B, and the source of the sixth switch element 40B is electrically connected to the ground. The fifth switch element 40A and the sixth switch element 40B constitute a rectifier circuit that rectifies the AC voltage appearing in the secondary coil 22A and 22B of the transformer 20. One end of the rectified output path 40C is electrically connected to a third connection point P3 to which the other end of the secondary coil 22A and the other end of the secondary coil 22B are electrically connected. One end of the choke coil 43 is electrically connected to the other end of the rectified output path 40C. The other end of the choke coil 43 is electrically connected to the fifth conductive path 85 and is also electrically connected to the ground via the secondary side capacitor 44. That is, the choke coil 43 is interposed between the third connection point P3 and the fifth conductive path 85. The secondary side capacitor 44 is electrically connected between the fifth conductive path 85 and the ground. The choke coil 43 and the secondary capacitor 44 smooth the rectified output appearing in the rectified output path 40C.

The voltage detection unit 13 and the low voltage side voltage detection unit 14 are configured as, for example, a voltage detection circuit. The voltage detection unit 13 detects the voltage of the first conductive path 81A, more specifically, the secondary side first conductive path 81AB. The low voltage side voltage detection unit 14 detects the voltage of the fifth conductive path 85.

The current detection unit 15 and the high-voltage side current detection unit 16 are configured as, for example, a current detection circuit. The current detection unit 15 is composed of, for example, a shunt resistor provided in the first conductive path 81B and a differential amplifier that amplifies and outputs the voltage across the shunt resistor. The current detection unit 15 detects the current flowing through the first conductive path 81B, more specifically, the secondary side first conductive path 81BB. The high-voltage side current detection unit 16 is composed of, for example, a shunt resistor provided in the fourth conductive path 84A and a differential amplifier that amplifies and outputs the voltage across the shunt resistor. The high-voltage side current detection unit 16 detects the current flowing through the fourth conductive path 84A.

The fuse 17 is interposed in the first conductive path 81B, more specifically, the secondary side first conductive path 81BB.

The control unit 18 has, for example, a microcomputer 50 and FET drivers 51 and 52 (see FIG. 2). The microcomputer 50 has a computing device such as a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), an A / D converter, and the like. The FET driver 51 is a circuit for driving a switch element of a high-voltage FET group 30X such as switch elements 30A, 30B, 30C, and 30D. The FET driver 52 is a circuit that drives the switch elements of the low-voltage FET group 40X such as the fifth switch element 40A and the sixth switch element 40B.

The control unit 18 is electrically connected to the SMRs 10 and 11 via the signal line 53, controls the SMRs 10 and 11 to an allowable state by giving an on signal, and shuts off the SMRs 10 and 11 by giving an off signal. Control to state. The control unit 18 switches the SMRs 10 and 11 from the cutoff state to the permissible state, for example, when the start switch of the vehicle is turned on. The control unit 18 performs a precharge operation of charging the capacitor 97 by the power conversion unit 12 before switching the SMRs 10 and 11 from the cutoff state to the allowable state. After starting the precharge operation, the control unit 18 repeatedly determines whether or not the precharge operation is completed, and after the precharge operation is completed, switches the SMRs 10 and 11 to the allowable state. The control unit 18 can grasp the on / off state of the vehicle start switch by receiving, for example, a signal indicating the on / off state of the vehicle start switch from an external ECU (Electronic Control Unit).

The voltage detection unit 13 and the low voltage side voltage detection unit 14 are electrically connected to the control unit 18 via the signal line 53, and indicate the voltage detected by the voltage detection unit 13 and the low voltage side voltage detection unit 14. The value is entered. The current detection unit 15 and the high-voltage side current detection unit 16 are electrically connected to the control unit 18 via the signal line 53, and indicate the current detected by the current detection unit 15 and the high-voltage side current detection unit 16. The value is entered.

The control unit 18 is electrically connected to the power conversion unit 12 via the signal line 53. The control unit 18 causes the power conversion unit 12 to perform a step-down operation or a step-up operation based on the voltage detection unit 13 and the low-voltage side voltage detection unit 14. That is, the control unit 18 causes the power conversion unit 12 to perform a step-down operation or a step-up operation based on the voltage of the secondary side first conductive path 81AB and the voltage of the fifth conductive path 85.

The control unit 18 switches the SMRs 10 and 11 to the cutoff state when a predetermined abnormality occurs. The "predetermined abnormality" is, for example, a short circuit of the drive unit 91. The control unit 18 determines, for example, whether or not the voltage detected by the voltage detection unit 13 is equal to or less than the threshold voltage, and if it is equal to or less than the threshold voltage, it is determined that an abnormality such as a short circuit has occurred. Alternatively, the control unit 18 determines, for example, whether or not the current detected by the current detection unit 15 is equal to or greater than the threshold current, and if it is equal to or greater than the threshold current, it is determined that an abnormality such as an overcurrent has occurred. For example, when the start switch of the vehicle is turned on, the control unit 18 switches the SMRs 10 and 11 to the allowable state, and repeatedly determines whether or not an abnormality has occurred. Then, when it is determined that an abnormality has occurred, the control unit 18 switches the SMRs 10 and 11 to the cutoff state.

[Hardware configuration of power control device]
As shown in FIG. 2, the power control device 1 includes a substrate 60 on which a power conversion unit 12 and a control unit 18 are installed. The first conductive paths 81A and 81B, the fourth conductive paths 84A and 84B and the SMRs 10 and 11 are installed on the substrate 60. The substrate 60 has a rectangular plate shape in a plan view. As shown in FIG. 3, the substrate 60 includes a plate-shaped insulating portion 61, a plurality of first conductive layers 62, a second conductive layer 63, and vias (Via) 64A, 64B, 64C, 64D, 64E, 64F. , 64G, 64H, 64I, 64J, and so on.

The insulating portion 61 is made of, for example, a synthetic resin. The insulating portion 61 is formed by laminating, for example, a plurality of insulating base material layers, and has a plate shape with the laminating direction as the thickness direction. The first conductive layer 62 is configured as a metal foil such as a copper foil. The plurality of first conductive layers 62 are formed as a conductor pattern on the surface of each insulating base material layer, so that the first conductive layers 62 are arranged so as to be offset from each other in the thickness direction of the substrate 60. That is, the substrate 60 has a first region 65 having a plurality of first conductive layers 62 arranged so as to be offset from each other in the thickness direction of the substrate 60. The first region 65 functions as a multilayer board. The first conductive layer 62 includes a signal line 53.

The second conductive layer 63 is configured as a metal foil such as a copper foil thicker than the first conductive layer 62, for example. The number of layers of the second conductive layer 63 is smaller than the number of layers of the first conductive layer 62, which is one layer in the present embodiment. At least a part of the second conductive layer 63 is arranged in the insulating portion 61. That is, the substrate 60 has a second region 66 having a second conductive layer 63. The second region 66 functions as a board with a built-in bus bar.

The second conductive layer 63 includes a pair of first conductive paths 81A and 81B. As described above, the first conductive path 81A has a primary side first conductive path 81AA and a secondary side first conductive path 81AB. An insulating portion 61 is interposed between the primary side first conductive path 81AA and the secondary side first conductive path 81AB. The terminal on the high potential side of the high voltage battery 90 is electrically connected to the primary side first conductive path 81AA via the via 64A. A part of the secondary side first conductive path 81AB protrudes outward from the side surface of the insulating portion 61, and the terminal on the high potential side of the inverter 95, that is, the second conductive path 82A is connected to the protruding portion 64K. It is electrically connected. The terminal on the primary side of the SMR 10 is electrically connected to the primary side first conductive path 81AA via the via 64C. The terminal on the secondary side of the SMR 10 is electrically connected to the first conductive path 81AB on the secondary side via the via 64D.

As described above, the first conductive path 81B has a primary side first conductive path 81BA and a secondary side first conductive path 81BB. An insulating portion 61 is interposed between the primary side first conductive path 81BA and the secondary side first conductive path 81BB. The terminal on the low potential side of the high voltage battery 90 is electrically connected to the primary side first conductive path 81BA via the via 64B. A part of the secondary side first conductive path 81BB has a form protruding outward from the side surface of the insulating portion 61, and the terminal on the low potential side of the inverter 95, that is, the second conductive path 82B is connected to the protruding portion 64L. It is electrically connected. The terminal on the primary side of the SMR 11 is electrically connected to the primary side first conductive path 81BA via the via 64E. The terminal on the secondary side of the SMR 11 is electrically connected to the first conductive path 81BB on the secondary side via the via 64F.

When the SMRs 10 and 11 are in the allowable state, the high-voltage battery 90 and the inverter 95 are electrically connected, and a large current flows from the high-voltage battery 90 side to the inverter 95 side via the second conductive layer 63. When the SMRs 10 and 11 are cut off, the high-voltage battery 90 and the inverter 95 are disconnected, and the current flow from the high-voltage battery 90 side to the inverter 95 side is cut off.

The pair of fourth conductive paths 84A and 84B are formed on the surface of the substrate 60. The fourth conductive path 84A is electrically connected to the secondary side first conductive path 81AB via the via 64G. The fourth conductive path 84B is electrically connected to the secondary side first conductive path 81BB via the via 64H. In FIG. 3, the fourth conductive paths 84A and 84B are omitted.

The fuse 17 is interposed in the secondary side first conductive path 81AB between the via 64D and the via 64G. The current detection unit 15 is interposed between the via 64F and the via 64H in the secondary side first conductive path 81BB.

The microcomputer 50 is electrically connected to the voltage detection unit 13, the low voltage side voltage detection unit 14, the current detection unit 15, and the high voltage side current detection unit 16 via the signal line 53, that is, the first conductive layer 62. .. Therefore, the microcomputer 50 can acquire the detection values of the voltage detection unit 13, the low voltage side voltage detection unit 14, the current detection unit 15, and the high voltage side current detection unit 16. In FIG. 2, the voltage detection unit 13, the low voltage side voltage detection unit 14, and the high voltage side current detection unit 16 are omitted.

Further, the microcomputer 50 is electrically connected to the SMRs 10 and 11 and the FET drivers 51 and 52 via the signal line 53, that is, the first conductive layer 62. The FET driver 51 is electrically connected to each gate of the switch elements 30A, 30B, 30C, 30D of the high-voltage FET group 30X via the signal line 53, that is, the first conductive layer 62. The FET driver 52 is electrically connected to each gate of the low-voltage FET group 40X, such as the fifth switch element 40A and the sixth switch element 40B, via the signal line 53, that is, the first conductive layer 62. Therefore, the microcomputer 50 can control the SMRs 10 and 11, the switch elements 30A, 30B, 30C, 30D, the fifth switch element 40A, and the sixth switch element 40B. That is, the microcomputer 50 can control the SMRs 10 and 11 and the power conversion unit 12.

The following description relates to the effect of the first embodiment.
According to the power control device 1 of the present disclosure, a pair of first conductive paths 81A, 81B and SMRs 10, 11 are integrated on a substrate 60 on which a power conversion unit 12 and a control unit 18 are installed. Therefore, the power control device 1 can be miniaturized.

Further, the substrate 60 has a first region 65 having a plurality of first conductive layers 62 arranged so as to be offset from each other in the thickness direction of the substrate 60, and a pair of first conductive paths 81A thicker than the first conductive layer 62. It has a second region 66 having a second conductive layer 63 including 81B. The SMRs 10 and 11 and the power conversion unit 12 are electrically connected to the control unit 18 via the first conductive layer 62.
According to this configuration, the configuration in which the configuration for controlling the power conversion unit 12 and the configuration for cutting off the large current flowing in the first conductive paths 81A and 81B by the SMRs 10 and 11 are integrated into the large size of the power control device 1. It can be realized while suppressing the change.

Further, the drive unit 91 has a capacitor 97. The control unit 18 performs a precharge operation of charging the capacitor 97 by the power conversion unit 12 before switching the SMRs 10 and 11 from the cutoff state to the allowable state, and after the precharge operation, switches the SMRs 10 and 11 to the allowable state.
According to this configuration, a series of processes for charging the capacitor 97 of the drive unit 91 by the precharge operation and then switching the SMRs 10 and 11 to the allowable state is self-completed only by the control unit 18 that controls the power conversion unit 12. Can be done.

Further, the power control device 1 includes a voltage detection unit 13 that detects the voltage of the secondary side first conductive paths 81AB and 81BB. The control unit 18 controls the power conversion unit 12 based on the voltage detected by the voltage detection unit 13.
According to this configuration, the electric power can be converted by the electric power conversion unit 12 by using the voltage of the path for supplying electric power to the drive unit 91 via the SMRs 10 and 11.

Further, the control unit 18 switches the SMRs 10 and 11 to the cutoff state when a predetermined abnormality occurs.
According to this configuration, the power supply from the high voltage battery 90 can be cut off in the event of an abnormality.

<Second Embodiment>
The power control device 201 of the power control system 200 of the second embodiment has a high voltage side voltage detection unit 270, and performs power conversion based on the voltage detected by the high voltage side voltage detection unit 270. Unlike one embodiment, it is common in other respects. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The high voltage side voltage detection unit 270 is configured as, for example, a voltage detection circuit. The high-voltage side voltage detection unit 270 detects the voltage input from the high-voltage battery 90 side to the power conversion unit 12, and more specifically, detects the voltage of the fourth conductive path 84A.

The control unit 18 is electrically connected to the high voltage side voltage detection unit 270, and can acquire the detection value of the high voltage side voltage detection unit 270. The control unit 18 performs a step-down operation or a step-up operation based on the voltage value detected by the high-voltage side voltage detection unit 270 and the voltage detected by the low-voltage side voltage detection unit 14. Further, the control unit 18 detects an abnormality based on the difference between the voltage detected by the voltage detection unit 13 and the voltage detected by the high voltage side voltage detection unit 270. For example, the control unit 18 determines that an abnormality has occurred when the difference between the voltage detected by the voltage detection unit 13 and the voltage detected by the high voltage side voltage detection unit 270 is equal to or greater than a predetermined value.
According to this configuration, an abnormality is detected based on the difference between the voltage of the path for supplying power to the drive unit 91 via the SMRs 10 and 11 and the voltage input to the power conversion unit 12 from the high voltage battery 90 side. Can be done.

<Third Embodiment>
The power control system 300 of the third embodiment includes an external control device 370 provided outside the power control device 1, and is different from the first embodiment in that the external control device 370 controls the SMRs 10 and 11. Other points are common. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As described above, the external control device 370 is provided outside the power control device 1. "Outside the power control device 1" means that it is not installed on the board 60. The external control device 370 is configured as, for example, an ECU. The external control device 370 controls the SMRs 10 and 11. According to this configuration, the SMRs 10 and 11 can be controlled not only by the power control device 1 but also by the external control device 370.

<Other embodiments>
The present disclosure is not limited to the embodiments described above with reference to the description and drawings. For example, the features of the embodiments described above or below can be combined in any combination within a consistent range. Further, any of the features of the above-mentioned or later-described embodiments may be omitted unless it is clearly stated as essential. Further, the above-described embodiment may be modified as follows.

In the first embodiment, the second embodiment, and the third embodiment, the power conversion unit is arranged between the drive unit and the low-voltage battery. On the other hand, the power conversion unit may be arranged between the high voltage battery and the drive unit.

In the first embodiment, the second embodiment, and the third embodiment, the power conversion unit is an isolated DCDC converter, but a non-isolated DCDC converter may be used.

In the first embodiment, the second embodiment, and the third embodiment, the system main relay is a mechanical relay, but the relay is not limited to the mechanical relay. For example, the system main relay may be a semiconductor relay such as a transistor.

In the first embodiment, the second embodiment, and the third embodiment, the fuse 17 is adopted as a component for blocking the overcurrent of the conductive path. However, the component that cuts off the overcurrent of the conductive path may be another component, and may be, for example, a current circuit breaker such as a pyrofuse.

In the first embodiment, the second embodiment, and the third embodiment, the control unit is mainly composed of a microcomputer, but it may be realized by a plurality of hardware circuits other than the microcomputer.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is not limited to the embodiments disclosed here, but includes all modifications within the scope indicated by the claims or within the scope equivalent to the claims. Is intended.

1: Power control device 10: System main relay 11: System main relay 12: Power conversion unit 13: Voltage detection unit 14: Low voltage side voltage detection unit 15: Current detection unit 16: High voltage side current detection unit 17: Fuse 18: Control Part 20: Transformer 21: Primary side coil 22A: Secondary side coil 22B: Secondary side coil 30: Primary side circuit 30A: First switch element 30B: Second switch element 30C: Third switch element 30D: Fourth switch element 30E: Primary side capacitor 30X: High voltage FET group 40: Secondary side circuit 40A: 5th switch element 40B: 6th switch element 40C: Rectification output path 40X: Low voltage FET group 43: Chalk coil 44: Secondary side capacitor 50: Microcomputer 51: FET driver 52: FET driver 53: Signal line 60: Substrate 61: Insulation part 62: First conductive layer 63: Second conductive layer 64A: Via 64B: Via 64C: Via 64D: Via 64E: Via 64F: Via 64G: Via 64H: Via 64K: Projection 64L: Projection 65: First region 66: Second region 81A: First conduction path 81AA: Primary side first conduction path 81AB: Secondary side first conduction path 81B: First conductive path 81BA: Primary side first conductive path 81BB: Secondary side first conductive path 82A: Second conductive path 82B: Second conductive path 83A: Third conductive path 83B: Third conductive path 84A: Fourth conductive path Road 84B: 4th conductive path 85: 5th conductive path 90: High voltage battery 91: Drive unit 92: High voltage load 93: Low voltage battery 94: Low voltage load 95: Inverter 95A: Switch element 95B: Switch element 95C: Switch element 95D: Switch element 95E: Switch element 95F: Switch element 96: Motor 97: Condenser 100: Power control system 200: In-vehicle power supply system 201: Power control device 270: High-voltage side voltage detector 300: In-vehicle power supply system 370: External control device P1: First connection point P2: Second connection point P3: Third connection point

Claims (7)

Conductive paths that form part of the path that supplies power from the high-voltage battery to the drive unit,
A system main relay that is interposed in the conductive path and switches between an allowable state that allows power supply from the high-voltage battery side to the drive unit side and a cutoff state that cuts off the power supply.
A power conversion unit that converts the power supplied by the conductive path, and
A control unit that controls the system main relay and the power conversion unit,
The board on which the power conversion unit and the control unit are installed,
Equipped with
A power control device in which the conductive path and the system main relay are installed on the substrate. The substrate has a first region having a plurality of first conductive layers and a second region having a second conductive layer that is thicker than the first conductive layer and includes the conductive path.
The power control device according to claim 1, wherein the system main relay and the power conversion unit are electrically connected to the control unit via the first conductive layer. The drive unit has a capacitor and
The control unit performs a precharge operation of charging the capacitor by the power conversion unit before switching the system main relay from the cutoff state to the allowable state, and after the precharge operation, the system main relay is operated. The power control device according to claim 1 or 2, which switches to the allowable state. A voltage detection unit that detects a voltage on the drive unit side of the system main relay in the conductive path is provided.
The power control device according to any one of claims 1 to 3, wherein the control unit controls the power conversion unit based on the voltage detected by the voltage detection unit. The power control device according to any one of claims 1 to 4, wherein the control unit switches the system main relay to the cutoff state when a predetermined abnormality occurs. A voltage detection unit that detects a voltage on the drive unit side of the system main relay in the conductive path, and a voltage detection unit.
The power conversion unit is provided with a high-voltage side voltage detection unit that detects a voltage input from the high-voltage battery side.
The control unit according to any one of claims 1 to 5, wherein the control unit detects an abnormality based on the difference between the voltage detected by the voltage detection unit and the voltage detected by the high voltage side voltage detection unit. Power control device. The power control device according to any one of claims 1 to 6.
An external control device provided outside the power control device is provided.
The external control device is a power control system that controls the system main relay.

Images