JP6786463B2 - Power converter - Google Patents

Description

The present invention relates to a power converter.

Conventionally, a semiconductor module arranged on the heat receiving surface of the cooler in the case, a bus bar connected to the semiconductor module, and a current sensor arranged between the end surface of the cooler and the case to detect the current flowing through the bus bar. A power conversion device including the above is known (see, for example, Patent Document 1).

JP 2015-076933

By the way, in the power conversion device according to the above-mentioned prior art, since the control circuit board connected to the semiconductor module is arranged so as to overlap the semiconductor module, the current sensor and the control circuit board arranged on the end face of the cooler There is a risk that the distance will be long. If the connection line such as the harness that connects the current sensor and the control circuit board becomes long, the resistance to noise may decrease, and it is desired to centrally arrange the parts connected to the control circuit board.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power conversion device capable of efficiently arranging parts connected to a control unit.

In order to solve the above problems and achieve the above object, the present invention has adopted the following aspects.
(1) The power conversion device according to one aspect of the present invention is a semiconductor module (for example, a semiconductor module) constituting a power conversion circuit that transfers power to and from a motor (for example, the first motor 12 and the second motor 13 in the embodiment). , The power module 21) in the embodiment, a control unit (for example, the electronic control unit 28 in the embodiment) arranged so as to overlap the semiconductor module in a plan view and controlling the semiconductor module, and the semiconductor module. The reactor (for example, the reactor 22 in the embodiment) arranged between the control unit and the current flowing through the reactor are detected, and the current detection unit arranged between the semiconductor module and the control unit. (For example, the third current sensor 27 in the embodiment) and a connection line (for example, signal lines 64, 75 in the embodiment) connecting the current detection unit and the control unit are provided.

(2) In the power conversion device according to (1) above, the current of the power conversion circuit is detected, and a second current detection unit (for example, implementation) arranged between the semiconductor module and the control unit is used. The first current sensor 25 and the second current sensor 26) in the embodiment, and the second connection line connecting the second current detection unit and the control unit (for example, the signal lines 65 and 76 in the embodiment). And may be provided.

(3) In the power conversion device according to (1) or (2) above, a temperature detection element (for example, in the embodiment) that is arranged between the semiconductor module and the control unit and detects the temperature of the reactor (for example, in the embodiment). A temperature sensor 22b) and a third connection line (for example, a signal line 74 in the embodiment) that connects the temperature detection element and the control unit may be provided.

(4) In the power conversion device according to any one of (1) to (3) above, the shape of the connecting line may be formed in a pin shape.

According to (1) above, since the reactor and the current detection unit are arranged between the semiconductor module and the control unit, the connection line connecting the reactor and the current detection unit and the semiconductor module becomes long. It can be suppressed. Further, in the manufacturing of the power conversion device, the process of connecting the reactor and the current detection unit and the control unit can be continuously performed in addition to the process of connecting the semiconductor module and the control unit, which complicates the manufacturing process. It is possible to suppress the conversion.

Further, in the case of (2) above, since the second current detection unit is also arranged between the semiconductor module and the control unit in addition to the current detection unit, the efficiency of a plurality of current detection units connected to the control unit is improved. It can be arranged well, and it is possible to prevent the time and effort required for connection from increasing.
Further, in the case of (3) above, the temperature detection element and the control unit can be easily and efficiently connected.
Further, in the case of (4) above, the current detection unit and the control unit can be easily and efficiently connected.

It is a side view which shows typically the structure of the electric power conversion apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of a part of the vehicle which carries the electric power conversion apparatus which concerns on embodiment of this invention. It is a side view which shows typically the structure of the electric power conversion apparatus which concerns on 1st modification of embodiment of this invention. It is a side view which shows typically the structure of the electric power conversion apparatus which concerns on the 2nd modification of embodiment of this invention. It is a side view which shows typically the structure of the electric power conversion apparatus which concerns on 3rd modification of embodiment of this invention.

Hereinafter, an embodiment of the power conversion device of the present invention will be described with reference to the accompanying drawings.

The power conversion device according to the present embodiment controls the power transfer between the motor and the battery. For example, the power conversion device is mounted on a vehicle such as an electric vehicle. Electric vehicles include electric vehicles, hybrid vehicles, fuel cell vehicles, and the like. Electric vehicles are powered by batteries. Hybrid vehicles are powered by batteries and internal combustion engines. A fuel cell vehicle is driven by using a fuel cell as a drive source.
FIG. 1 is a side view schematically showing the configuration of the power conversion device 1 according to the embodiment of the present invention. FIG. 2 is a diagram showing a partial configuration of a vehicle 10 equipped with the power conversion device 1 according to the embodiment of the present invention.

As shown in FIG. 2, the vehicle 10 includes a battery 11, a first motor 12 for traveling drive, and a second motor 13 for power generation, in addition to the power conversion device 1.
The battery 11 includes a battery case and a plurality of battery modules housed in the battery case. The battery module includes a plurality of battery cells connected in series. The battery 11 includes a positive electrode terminal PB and a negative electrode terminal NB connected to the DC connector 1a of the power conversion device 1. The positive electrode terminal PB and the negative electrode terminal NB of the battery 11 are connected to the positive electrode end and the negative electrode end of a plurality of battery modules connected in series in the battery case.

The first motor 12 generates a rotational driving force by the electric power supplied from the battery 11. The second motor 13 generates regenerative power by the rotational driving force input to the rotary shaft. Further, the first motor 12 can also charge the battery 11 by the regenerative power generated by the rotational driving force input from the driving wheels to the rotating shaft of the first motor 12 when the vehicle 10 is decelerated. For example, each of the first motor 12 and the second motor 13 is a three-phase AC brushless DC motor. The three phases are the U phase, the V phase, and the W phase. Each of the first motor 12 and the second motor 13 is an inner rotor type, and has a rotor having a permanent magnet for a field magnet and a three-phase stator winding for generating a rotating magnetic field for rotating the rotor. It has a stator to have. The three-phase stator windings of the first motor 12 are connected to the first three-phase connector 1b of the power converter 1. The three-phase stator windings of the second motor 13 are connected to the second three-phase connector 1c of the power converter 1.

The power conversion device 1 includes a power module 21, a reactor 22, a capacitor unit 23, a resistor 24, a first current sensor 25, a second current sensor 26, a third current sensor 27, and an electronic control unit 28. And a gate drive unit 29.
The power module 21 includes a semiconductor module that constitutes a power conversion circuit that transfers power to and from the first motor 12 and the second motor 13. The power module 21 includes a first power conversion circuit unit 31, a second power conversion circuit unit 32, and a third power conversion circuit unit 33 as a semiconductor module composed of semiconductor elements. The first power conversion circuit unit 31 is connected to the three-phase stator winding of the first motor 12 by the first three-phase connector 1b. The first power conversion circuit unit 31 converts the DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power. The second power conversion circuit unit 32 is connected to the three-phase stator winding of the second motor 13 by the second three-phase connector 1c. The second power conversion circuit unit 32 converts the three-phase AC power input from the second motor 13 into DC power.

Each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 includes a bridge circuit formed by a plurality of switching elements connected by a bridge. For example, the switching element is a transistor such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semi-conductor Field Effect Transistor). For example, in a bridge circuit, a pair of high-side and low-side U-phase transistors UH and UL, a pair of high-side and low-side V-phase transistors VH and VL, and a pair of high-side and low-side W-phase transistors The WH and WL are bridge-connected. In each of the high-side transistors UH, VH, and WH, a collector is connected to the positive electrode terminal PI to form a high-side arm.

In each phase, each positive electrode terminal PI of the high side arm is connected to a positive electrode bus bar. The emitters of each of the low-side transistors UL, VL, and WL are connected to the negative electrode terminal NI to form a low-side arm. In each phase, each negative electrode terminal NI of the low side arm is connected to the negative electrode bus bar. In each phase, the emitters of the transistors UH, VH, and WH of the high side arm are connected to the collectors of the transistors UL, VL, and WL of the low side arm at the input / output terminal TI.

In each phase of the first power conversion circuit unit 31, the input / output terminal TI is connected to the first three-phase connector 1b by the first bus bar 51. The input / output terminals TI of each phase of the first power conversion circuit unit 31 are connected to the stator windings of each phase of the first motor 12 via the first bus bar 51 and the first three-phase connector 1b. In each phase of the second power conversion circuit unit 32, the input / output terminal TI is connected to the second three-phase connector 1c by the second bus bar 52.

The input / output terminals TI of each phase of the second power conversion circuit unit 32 are connected to the stator windings of each phase of the second motor 13 via the second bus bar 52 and the second three-phase connector 1c. The bridge circuit includes a diode connected between the collector and the emitter of each transistor UH, UL, VH, VL, WH, and WL so as to be forward from the emitter to the collector.

Each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 is based on a gate signal which is a switching command input from the gate drive unit 29 to the gate of each transistor UH, VH, WH, UL, VL, WL. , Switches the transistor pair of each phase on (conducting) / off (disconnecting).
The first power conversion circuit unit 31 converts the DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power, and energizes the three-phase stator windings of the first motor 12. The three-phase stator windings are energized with alternating current U-phase current, V-phase current, and W-phase current by sequentially commutating.
The second power conversion circuit unit 32 drives the on (conduction) / off (disconnection) of the transistor pairs of each phase synchronized with the rotation of the second motor 13 to drive the three-phase stator windings of the second motor 13. The three-phase AC power output from is converted to DC power.

When the first motor 12 is driven by the electric power output from the battery 11, the third power conversion circuit unit 33 may increase the output voltage of the battery 11 and output it to the positive electrode terminal PV and the negative electrode terminal NV side. It is possible.
When the battery 11 is charged by the regenerated power of the first motor 12 or the second motor, the third power conversion circuit unit 33 lowers the output voltage of the first motor 12 or the second motor to lower the output voltage of the first motor 12 or the second motor to lower the positive electrode terminal PB and the negative electrode. It is possible to output from the terminal NB side to the battery 11 side.

The third power conversion circuit unit 33 includes a pair of high-side and low-side switching elements. For example, the third power conversion circuit unit 33 includes a first transistor S1 on the high side and a second transistor S2 on the low side. In the first transistor S1, a collector is connected to the positive electrode terminal PV to form a high side arm. The positive electrode terminal PV of the high side arm is connected to the positive electrode bus bar. The emitter of the second transistor S2 is connected to the negative electrode terminal NV to form a low side arm.

The negative electrode terminal NV of the low side arm is connected to the negative electrode bus bar. The emitter of the first transistor S1 of the high side arm is connected to the collector of the second transistor S2 of the low side arm. The third power conversion circuit unit 33 includes a diode connected between the collectors of the first transistor S1 and the second transistor S2 so as to be forward from the emitter to the collector.

The connection point between the first transistor S1 of the high side arm and the second transistor S2 of the low side arm is connected to the reactor 22 by the third bus bar 53. Both ends of the reactor 22 are connected to the connection points of the first transistor S1 and the second transistor S2 and the positive electrode terminal PB of the battery 11. The reactor 22 includes a coil 22a and a temperature sensor 22b that detects the temperature of the coil 22a. The temperature sensor 22b is connected to the electronic control unit 28 by a signal line.

The third power conversion circuit unit 33 turns on (conducts) / turns off (cuts off) the transistor pair based on the gate signal which is a switching command input from the gate drive unit 29 to each gate of the first transistor S1 and the second transistor S2. ) Is switched.
The third power conversion circuit unit 33 has a first state in which the second transistor S2 is set to on (conduction) and the first transistor S1 is set to off (cutoff) at the time of boosting, and the second transistor S2 is turned off (cut off). And the second state in which the first transistor S1 is set to be on (conducting) are alternately switched.

In the first state, a current flows sequentially to the positive electrode terminal PB of the battery 11, the reactor 22, the second transistor S2, and the negative electrode terminal NB of the battery 11, and the reactor 22 is DC excited to store magnetic energy. In the second state, an electromotive voltage (induced voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux due to the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy stored in the reactor 22 is superimposed on the battery voltage, and a boost voltage higher than the voltage between the terminals of the battery 11 is generated between the positive electrode terminal PV and the negative electrode terminal NV of the third power conversion circuit unit 33. It is applied.

The third power conversion circuit unit 33 alternately switches between the second state and the first state at the time of regeneration. In the second state, a current flows sequentially to the positive electrode terminal PV of the third power conversion circuit unit 33, the first transistor S1, the reactor 22, and the positive electrode terminal PB of the battery 11, and the reactor 22 is DC excited to accumulate magnetic energy. Will be done. In the first state, an electromotive voltage (induced voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux due to the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy stored in the reactor 22 is stepped down, and the step-down voltage lower than the voltage between the positive electrode terminal PV and the negative electrode terminal NV of the third power conversion circuit unit 33 is lower than the voltage between the positive electrode terminal PB and the negative electrode terminal NB of the battery 11. Is applied between and.

The capacitor unit 23 includes a first smoothing capacitor 41, a second smoothing capacitor 42, and a noise filter 43.
The first smoothing capacitor 41 is connected between the positive electrode terminal PB and the negative electrode terminal NB of the battery 11. The first smoothing capacitor 41 smoothes the voltage fluctuation generated by the on / off switching operation of the first transistor S1 and the second transistor S2 at the time of regeneration of the third power conversion circuit unit 33.

The second smoothing capacitor 42 is provided between the positive electrode terminal PI and the negative electrode terminal NI of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and the positive electrode terminal PV and the negative electrode terminal NV of the third power conversion circuit unit 33. It is connected in between. The second smoothing capacitor 42 is generated in association with the on / off switching operation of each of the transistors UH, UL, VH, VL, WH, and WL of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32. Smooth voltage fluctuations. The second smoothing capacitor 42 smoothes the voltage fluctuation generated by the on / off switching operation of the first transistor S1 and the second transistor S2 when the third power conversion circuit unit 33 is boosted.

The noise filter 43 is provided between the positive electrode terminal PI and the negative electrode terminal NI of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive electrode terminal PV and the negative electrode terminal NV of the third power conversion circuit unit 33. It is connected. The noise filter 43 includes two capacitors connected in series. The connection points of the two capacitors are connected to the body ground of the vehicle or the like.
The resistor 24 is provided between the positive electrode terminal PI and the negative electrode terminal NI of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive electrode terminal PV and the negative electrode terminal NV of the third power conversion circuit unit 33. It is connected.

The first current sensor 25 is arranged on the bus bar 51 that connects the input / output terminals TI of each phase of the first power conversion circuit unit 31 and the first three-phase connector 1b, and is of U-phase, V-phase, and W-phase. Detect each current. The second current sensor 26 is arranged on the bus bar 52 that connects the input / output terminal TI of each phase of the second power conversion circuit unit 32 and the second three-phase connector 1c, and is of U-phase, V-phase, and W-phase. Detect each current. The third current sensor 27 is arranged on the bus bar 53 that connects the connection points of the first transistor S1 and the second transistor S2 and the reactor 22, and detects the current flowing through the reactor 22.
Each of the first current sensor 25, the second current sensor 26, and the third current sensor 27 is connected to the electronic control unit 28 by a signal line. For example, the shape of the signal line is formed in a pin shape, and is soldered to the circuit board 61 in a state of being inserted into a hole (not shown) of the circuit board 61.

The electronic control unit 28 can perform current feedback control of, for example, the first motor 12 and the second motor 13 based on the current values detected by the first current sensor 25 and the second current sensor 26. Further, the electronic control unit 28 performs overcurrent protection control of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 based on the current values detected by the first current sensor 25 and the second current sensor 26. It is also possible.
The electronic control unit 28 constitutes the third power conversion circuit unit 33 by controlling the third power conversion circuit unit 33 so that the current value detected by the third current sensor 27 does not exceed a predetermined threshold value, for example. It is possible to protect the first transistor S1 and the second transistor S2.
Further, when the third power conversion circuit unit 33 is an interleaved circuit configured by connecting a plurality of chopper circuits in parallel, a current sensor is connected to each reactor of the plurality of chopper circuits and flows to each reactor. It may be controlled so as to equalize the current values.

The electronic control unit 28 controls the operation of each of the first motor 12 and the second motor 13. For example, the electronic control unit 28 is a software functional unit that functions by executing a predetermined program by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) equipped with a processor such as a CPU, a ROM (Read Only Memory) for storing programs, a RAM (Random Access Memory) for temporarily storing data, and an electronic circuit such as a timer. is there.

At least a part of the electronic control unit 28 may be an integrated circuit such as an LSI (Large Scale Integration).
For example, the electronic control unit 28 executes current feedback control using the current detection value of the first current sensor 25 and the current target value corresponding to the torque command value for the first motor 12, and inputs the current to the gate drive unit 29. Generate a control signal.
For example, the electronic control unit 28 executes current feedback control using the current detection value of the second current sensor 26 and the current target value corresponding to the regeneration command value for the second motor 13, and inputs the current to the gate drive unit 29. Generate a control signal.

The control signal indicates the timing for driving each transistor UH, VH, WH, UL, VL, WL of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 on (conducting) / off (disconnecting). It is a signal. For example, the control signal is a pulse width modulated signal or the like.

The gate drive unit 29 actually performs each transistor UH, VH, WH, UL, VL, WL of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 based on the control signal received from the electronic control unit 28. Generates a gate signal to drive on (conducting) / off (cutting off). For example, the gate drive unit 29 generates a gate signal by performing amplification and level shifting of the control signal.

The gate drive unit 29 generates a gate signal for driving each of the first transistor S1 and the second transistor S2 of the third power conversion circuit unit 33 on (conducting) / off (disconnecting). For example, the gate drive unit 29 generates a gate signal having a duty ratio according to a boost voltage command at the time of boosting of the third power conversion circuit unit 33 or a step-down voltage command at the time of regeneration of the third power conversion circuit unit 33. The duty ratio is the ratio of the on-time of the first transistor S1 and the second transistor S2 in the switching cycle.

As shown in FIG. 1, in the power conversion device 1, the power module 21 and the circuit board 61 on which the electronic control unit 28 and the gate drive unit 29 are mounted are arranged so as to overlap each other in a plan view. The signal line 62 for the gate signal connecting the power module 21 and the circuit board 61 is drawn out from the facing surfaces of the power module 21 and the circuit board 61, and is arranged between the power module 21 and the circuit board 61. ing.

The reactor 22 is arranged between the power module 21 and the circuit board 61. As a result, the power module 21 is arranged outside between the circuit board 61 and the reactor 22, and is not arranged between the circuit board 61 and the reactor 22. The signal line 63 connecting the temperature sensor 22b of the reactor 22 and the circuit board 61 is drawn out from the facing surfaces of the reactor 22 and the circuit board 61, and is arranged between the reactor 22 and the circuit board 61. The third bus bar 53 that connects the reactor 22 and the third power conversion circuit unit 33 of the power module 21 is arranged between the surface of the power module 21 facing the circuit board 61 and the side surface of the reactor 22. The side surface of the reactor 22 is a surface in a direction intersecting the arrangement direction of the power module 21 and the circuit board 61. The third current sensor 27 provided on the third bus bar 53 and the signal line 64 connecting the third current sensor 27 and the circuit board 61 are arranged between the power module 21 and the circuit board 61. ..

The first bus bar 51 and the second bus bar 52 connected to the first power conversion circuit unit 31 and the second power conversion circuit unit 32 of the power module 21 are drawn out from the surface of the power module 21 facing the circuit board 61. .. A signal line connecting the first current sensor 25 and the second current sensor 26 provided in each of the first bus bar 51 and the second bus bar 52, each of the first current sensor 25 and the second current sensor 26, and the circuit board 61. The 65 is arranged between the power module 21 and the circuit board 61.

The first bus bar 51, the second bus bar 52, the third bus bar 53, and the first current sensor 25, the second current sensor 26, and the third current sensor 27 are powered so as not to overlap the reactor 22 in a plan view. It is arranged between the module 21 and the circuit board 61.
A cooling unit 66 on which the power module 21 is mounted is arranged on the opposite side of the reactor 22 when viewed from the power module 21 in the arrangement direction of the power module 21 and the circuit board 61. The cooling unit 66 includes a refrigerant flow path through which the refrigerant flows and a mounting surface that contacts the surface of the power module 21. For example, the refrigerant flow path of the cooling unit 66 is formed by a water jacket.

As described above, according to the power conversion device 1 of the present embodiment, the third current sensor 27 that detects the current flowing through the reactor 22 and the reactor 22 is a circuit board on which the power module 21 and the electronic control unit 28 are mounted. Since it is arranged between the reactor 22 and the third current sensor 27, it is possible to prevent the connection line connecting the reactor 22 and the third current sensor 27 from becoming long. Further, at the time of manufacturing the power conversion device 1, in addition to the step of connecting the power module 21 and the electronic control unit 28, the step of connecting the reactor 22 and the third current sensor 27 and the electronic control unit 28 is continuously performed. This can be done, and the complexity of the manufacturing process can be suppressed.

Further, since the first current sensor 25 and the second current sensor 26 are also arranged between the power module 21 and the electronic control unit 28 in addition to the third current sensor 27, a plurality of current sensors 25 connected to the electronic control unit 28 are connected. The current sensors can be centrally and efficiently arranged, and it is possible to prevent the time and effort required for connection from increasing.
Further, the signal line 64 connecting the third current sensor 27 and the circuit board 61 and the signal line 65 connecting each of the first current sensor 25 and the second current sensor 26 to the circuit board 61 are formed in a pin shape. Since it is formed, an easy and efficient connection can be made.
Further, since the cooling unit 66 for cooling at least one surface of the power module 21 is provided, the power module 21 can be appropriately cooled.

Hereinafter, a modified example of the embodiment will be described.
In the above-described embodiment, the power conversion device 1 includes, but is not limited to, one cooling unit 66 on which the power module 21 is mounted.

FIG. 3 is a side view schematically showing the configuration of the power conversion device 1 according to the first modification of the embodiment of the present invention.
As shown in FIG. 3, the power conversion device 1 according to the first modification includes two cooling units 66 that sandwich both sides of the power module 21 from both sides in the arrangement direction of the power module 21 and the circuit board 61. The two cooling units 66 are located between the power module 21 and the reactor 22 with the first cooling unit 66a arranged on the opposite side of the reactor 22 when viewed from the power module 21 in the arrangement direction of the power module 21 and the circuit board 61. The second cooling unit 66b to be arranged.

The third bus bar 53 is arranged between the side surface of the power module 21 and the side surface of the reactor 22. The side surface of the power module 21 is a surface in a direction intersecting the arrangement direction of the power module 21 and the circuit board 61. The third current sensor 27 of the third bus bar 53 and the signal line 64 connecting the third current sensor 27 and the circuit board 61 are arranged between the second cooling unit 66b and the circuit board 61.
The first bus bar 51 and the second bus bar 52 are pulled out from the side surface of the power module 21. The first current sensor 25 and the second current sensor 26 of the first bus bar 51 and the second bus bar 52 are arranged in the immediate vicinity of the side surface of the power module 21. Each of the first current sensor 25 and the second current sensor 26 is connected to the circuit board 61 by a signal line 65.

In the above-described embodiment, the power conversion device 1 includes, but is not limited to, the circuit board 61 on which the electronic control unit 28 and the gate drive unit 29 are mounted.

FIG. 4 is a side view schematically showing the configuration of the power conversion device 1 according to the second modification of the embodiment of the present invention.
As shown in FIG. 4, the power conversion device 1 according to the second modification includes a first circuit board 71 on which the electronic control unit 28 is mounted and a second circuit board 72 on which the gate drive unit 29 is mounted. There is. The power module 21, the first circuit board 71, and the second circuit board 72 are arranged so as to overlap each other in a plan view. The signal line 73 for the gate signal connecting the power module 21 and the second circuit board 72 is drawn out from the facing surfaces of the power module 21 and the second circuit board 72, and the power module 21 and the second circuit board 72 are drawn from each other. It is placed between and. A cooling unit 66 for mounting the power module 21 is arranged on the opposite side of the second circuit board 72 when viewed from the power module 21 in the arrangement direction of the power module 21 and the second circuit board 72.

The reactor 22 is arranged between the cooling unit 66 on which the power module 21 is mounted and the first circuit board 71. As a result, the power module 21 is arranged outside between the first circuit board 71 and the reactor 22, and is not arranged between the first circuit board 71 and the reactor 22. The signal line 74 connecting the temperature sensor 22b of the reactor 22 and the first circuit board 71 is drawn out from the facing surfaces of the reactor 22 and the first circuit board 71, and is between the reactor 22 and the first circuit board 71. It is located in. The third bus bar 53 is arranged between the side surface of the power module 21 and the side surface of the reactor 22. The third current sensor 27 of the third bus bar 53 and the signal line 75 connecting the third current sensor 27 and the first circuit board 71 are arranged between the cooling unit 66 and the first circuit board 71. .. For example, the shape of the signal line 75 is formed in a pin shape, and is soldered to the circuit board 61 in a state of being inserted into a hole (not shown) of the circuit board 71.

The first bus bar 51 and the second bus bar 52 are pulled out from the side surface of the power module 21. The first current sensor 25 and the second current sensor 26 of the first bus bar 51 and the second bus bar 52 are arranged in the immediate vicinity of the side surface of the power module 21. Each of the first current sensor 25 and the second current sensor 26 is connected to the first circuit board 71 by a signal line 76. For example, the shape of the signal line 76 is formed in a pin shape.

In the second modification of the above-described embodiment, the power conversion device 1 includes, but is not limited to, one cooling unit 66 on which the power module 21 is mounted.

FIG. 5 is a side view schematically showing the configuration of the power conversion device 1 according to the third modification of the embodiment of the present invention.
As shown in FIG. 5, the power conversion device 1 according to the third modification includes two cooling units 66 that sandwich the power module 21 from both sides in the arrangement direction of the power module 21 and the first circuit board 71. The two cooling units 66 are a first cooling unit 66a and a second cooling unit 66b. The two cooling units 66 are the first cooling unit 66a arranged on the opposite side of the reactor 22 when viewed from the power module 21 in the arrangement direction of the power module 21 and the first circuit board 71, and the power module 21 and the reactor 22. A second cooling unit 66b arranged between them.

The reactor 22 is arranged between the second cooling unit 66b on which the power module 21 is mounted and the first circuit board 71. As a result, the power module 21 is arranged outside between the first circuit board 71 and the reactor 22, and is not arranged between the first circuit board 71 and the reactor 22. The third current sensor 27 of the third bus bar 53 and the signal line 75 connecting the third current sensor 27 and the first circuit board 71 are arranged between the second cooling unit 66b and the first circuit board 71. ing.

In the above-described embodiment, the power conversion device 1 is mounted on the vehicle, but the present invention is not limited to this, and the power conversion device 1 may be mounted on other devices.
In the above-described embodiment, the power conversion device 1 includes a first power conversion circuit unit 31 and a second power conversion circuit unit 32 that control power transfer between the first motor 12 and the second motor 13. It was prepared, but it is not limited to this. The power converter 1 may be configured to control one or more motors.

In the above-described embodiment, the power conversion device 1 controls power transfer between the first motor 12 for driving and the second motor 13 for power generation, but the present invention is not limited to this. For example, the power conversion device 1 may control another motor such as a pump drive motor provided in an electric compressor such as an air conditioner.

The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention as well as the invention described in the claims and the equivalent scope thereof.

1 ... Power converter, 10 ... Vehicle, 11 ... Battery, 12 ... 1st motor, 13 ... 2nd motor, 21 ... Power module (semiconductor module), 22 ... Reactor, 22b ... Temperature sensor (temperature detection element), 25 … First current sensor (second current detection unit), 26… second current sensor (second current detection unit), 27… third current sensor (current detection unit), 28… electronic control unit (control unit) , 29 ... Gate drive unit, 64 ... Signal line (connection line), 65 ... Signal line (second connection line), 61 ... Circuit board, 66 ... Cooling unit, 66a ... First cooling unit, 66b ... Second cooling unit , 71 ... 1st circuit board, 72 ... 2nd circuit board, 74 ... signal line (third connection line), 75 ... signal line (connection line), 76 ... signal line (second connection line)

Claims (4)

Semiconductor modules that make up a power conversion circuit that sends and receives power to the motor,
A control unit that is arranged so as to overlap the semiconductor module in a plan view and controls the semiconductor module.
A reactor arranged between the semiconductor module and the control unit,
A current detection unit, which is arranged between the semiconductor module and the control unit and detects a current flowing through the reactor,
A connection line connecting the current detection unit and the control unit,
To prepare
A power conversion device characterized by that. A second current detection unit, which is arranged between the semiconductor module and the control unit and detects a current flowing through the semiconductor module,
A second connection line connecting the second current detection unit and the control unit,
To prepare
The power conversion device according to claim 1. A temperature detection element, which is arranged between the semiconductor module and the control unit and detects the temperature of the reactor,
A third connection line connecting the temperature detection element and the control unit,
The power conversion device according to claim 1 or 2, wherein the power conversion device is provided. The shape of the connecting wire is formed in a pin shape.
The power conversion device according to any one of claims 1 to 3, wherein the power conversion device is characterized by the above.

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