JP2017212782A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the influence of electromagnetic noise of a power converter.SOLUTION: A power converter according to the present embodiment comprises: a circuit part in which a voltage value of input voltage or output voltage fluctuates during driving; a flow channel organizer for forming a flow channel to stream a cooling refrigerant; a first circuit board arranged at a position opposite to one surface of the flow channel organizer; a second circuit board arranged at a position opposite to the other surface of the flow channel organizer on the side opposite to the one surface; wiring arranged to cross the flow channel organizer, for transmitting a control signal between the first circuit board and the second circuit board; and a shielding part which is provided on the flow channel organizer and arranged at a predetermined position sandwiched by the circuit part and the wiring.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power conversion device, and more particularly to a power conversion device used for a hybrid vehicle or an electric vehicle.

  The power conversion device has a main circuit including a power semiconductor module, converts a direct current by switching, and outputs an alternating current. In order to increase the conversion efficiency of the power converter, the current flowing through the drive circuit and the control circuit that generates a command signal for switching is limited to a small value, and one main circuit has several tens of currents flowing through the two circuits. A large current more than several hundred times flows.

  Magnetic flux is generated around the wiring through which this large current flows in accordance with the electromagnetic field law. This magnetic flux affects the control circuit as electromagnetic noise, and changes the current flowing in the control circuit. This change may cause the control circuit to malfunction.

  In the prior art (Patent Document 1), in order to solve the above problem, a magnetic body is interposed between the main circuit and the control circuit, and magnetic flux as electromagnetic noise is concentrated in the magnetic body, and the control circuit exists. Magnetic flux generation in the space was suppressed.

  In the prior art, the drive circuit and the control circuit are arranged at a position opposite to one surface of the flow path forming body through which the cooling refrigerant of the inverter flows, and a dedicated structure (MC base, electromagnetic noise) for supporting the control circuit board. There are parts that also have a shielding role.

Patent 4657329

  The subject of this invention is reducing the influence of the electromagnetic noise of a power converter device.

  In order to solve the above problems, a power converter according to the present invention includes a circuit unit (400) in which the voltage value of an input voltage (200) or an output voltage (300) varies during driving, and a flow path for flowing a cooling refrigerant. (510) forming a flow path forming body (500), a first circuit board (600) disposed at a position facing one surface (520) of the flow path forming body, and the flow path forming body One surface transmits a control signal between the second circuit board (700) disposed opposite to the other surface (530) on the opposite side, and between the first circuit board and the second circuit board, and A wiring (800) disposed across the flow path forming body, and a shielding part (540) disposed on the flow path forming body and disposed at a predetermined position (900) sandwiched between the circuit section and the wiring. .

    By this invention, the influence of the electromagnetic noise of a power converter device can be reduced.

1 is an exploded perspective view of a power conversion device 100. FIG. FIG. 2 is a perspective view of the flow path forming body 500 of FIG. 1 as viewed from one surface 520 side. It is sectional drawing which looked at the shielding part 540 in the power converter device 100 from the one surface 520 side. FIG. 2 is a perspective view of the flow path forming body 500 of FIG. 1 as viewed from one surface 520 side. FIG. 2 is a perspective view showing the vicinity of a flow path forming body 500 in FIG. It is sectional drawing which looked at the shielding part 540 in the power converter device 100 which concerns on another Example from the one surface 520 side.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view of the power conversion apparatus 100.

  An input voltage 200 is applied to the circuit unit 400 (400a, 400c, etc.), a direct current is converted into an alternating current by the power semiconductor module 400b, and output voltages 300a to 300c are generated.

  The flow path forming body 500 has the flow path 510 shown in FIG. 2 and houses the power semiconductor module 400b. One power semiconductor module 400b is provided for each of the U phase, the V phase, and the W phase, and there are a total of three power semiconductor modules 400b.

  The first circuit board 600 is assembled to the surface 520 that houses the power semiconductor module 400 b in the flow path forming body 500. The first circuit board 600 is a drive circuit board that outputs a drive signal to the power semiconductor module 400b, for example. The second circuit board 700 is assembled to the surface 530 opposite to the one surface 520 in the flow path forming body 500. The second circuit board 700 is a control circuit board that outputs a control signal for controlling the power semiconductor module 400b, for example.

  The wiring 800 connects the first circuit board 600 and the second circuit board 700, and transmits a control signal between the two boards.

  Between the AC circuit 400c, which is a part of the circuit unit 400, and the wiring 800, a shielding unit 540 in which a part of the flow path forming body 500 protrudes is interposed. The housing 101 houses the flow path forming body 500 on which various components are mounted.

  FIG. 2 is a perspective view of the flow path forming body 500 of FIG. 1 as viewed from one surface 520 side.

  The flow path forming body 500 forms a first row in which the two power semiconductor modules 400b are opposed in the height direction, and a second row in which the power semiconductor module 400b and the AC circuit 400c are opposed in the height direction. On the other hand, the flow path 510 formed in the flow path forming body 500 includes a power semiconductor module 400b on the upper side of the first row, a power semiconductor module 400b on the second row, an AC circuit 400c on the second row, and a lower side of the first row. The power semiconductor modules 400b are formed so that the coolant flows in the order of the power semiconductor modules 400b.

  FIG. 3 is a cross-sectional view of the shielding unit 540 in the power conversion device 100 as viewed from one surface 520 side.

  The flow path forming body 500 has a protruding shape at a part thereof, and the protruding shape forms the shielding part 540. The shielding part 540 has a guide part 550 for positioning the wiring 800. The guide unit 550 fixes the wiring 800 and holds the wiring 800 at a predetermined position 900.

  Components for forming the electromagnetic noise shielding space 900 are the flow path forming body 500 and the casing 101 of the power converter 100. For the purpose of downsizing the power conversion device 100, the electromagnetic noise shielding space 900 is also required to be downsized. By fixing the wiring 800 for transmitting the control signal at a predetermined position, the flow path forming body 500 and the housing 101 are arranged close to each other so that the predetermined position becomes the electromagnetic noise shielding space 900, and the power conversion device 100. Realization of downsizing.

  In addition, after the wiring 800 is assembled to the flow path forming body 500, the flow path forming body 500 is assembled to the housing 101. Therefore, in consideration of simplification of assembly work, the wiring 800 needs to be fixed at a predetermined position when assembled to the flow path forming body 500. In order to perform this fixing, a protruding portion is provided in the shielding portion 540 provided in a part of the flow path forming body 500, and this protruding portion is used as a guide portion 550. Thereby, the assembly work of the power converter device 100 can be simplified.

  FIG. 4 is a perspective view of the flow path forming body 500 of FIG. 1 as viewed from one surface 520 side.

  The flow path forming body 500 forms a storage space 560 for storing the power semiconductor module 400b. The power semiconductor module 400b converts the direct current 1000 into an alternating current 1100. The AC wiring 400c is connected to the power semiconductor module 400b and transmits AC current 1100 to the motor.

  The power semiconductor module 400b is housed in the flow path forming body 500 and cooled. Since the first circuit board 600 is arranged on the surface 520 that houses the power semiconductor module 400b in the flow path forming body 500, the AC wiring 400c that outputs the alternating current 1100 generated by the power semiconductor module 400b is the first circuit board. It is difficult to arrange on the same plane as 600. As a result, an event occurs in which the wiring 800 and the AC wiring 400c that outputs the AC current 1100 exist in the same space, and a shielded space 900 is required to isolate the wiring 800 from the influence of electromagnetic noise.

  Therefore, the power semiconductor module 400b employs double-sided cooling with a refrigerant to increase the cooling efficiency and maximize the current capacity per volume. In order to transmit a drive command with high accuracy, the first circuit board 600 is disposed at a position closest to the power semiconductor module 400b and fixed to the flow path forming body 500. The AC current 1100 generated by the power semiconductor module 400b flows through the AC wiring 400c and is supplied to the motor.

  Thereby, the current capacity per volume of the power converter device 100 can be improved by improving the cooling efficiency of the power semiconductor module 400b.

  FIG. 5 is a perspective view showing the vicinity of the flow path forming body 500 in FIG.

  The flow path forming body 500 is housed in the housing 101, and is connected and fixed to the housing 101 by a first indicating portion 570 and a second indicating portion 580 which are a plurality of support portions included in the flow path forming body 500. Since the flow path forming body 500 is supported by the casing 101 of the power conversion apparatus 100, the flow path forming body 500 has a plurality of fixed points (first instruction unit 570 and second instruction unit 580). In order to adapt to mounting on a vehicle, the flow path forming body 500 is required to have vibration resistance, and rigidity between the fixed points (the first indicating portion 570 and the second indicating portion 580) is required. The rigidity is improved by providing a beam so as to connect between the fixed points (the first instruction unit 570 and the second instruction unit 580).

  In addition to the function of shielding electromagnetic noise, shielding unit 540 serves as a beam between flow path forming body fixing points (first indicating unit 570 and second indicating unit 580) and contributes to improving vibration resistance of power conversion device 100. To do.

  It is desirable that the wiring 800 has a shape maintaining function and a deformability that can easily remain in the electromagnetic noise shielding space 900.

  Therefore, the wiring 800 maintains the shape arranged at the predetermined position 900 by the shape maintaining function of the flexible substrate. Furthermore, the fixing work of the wiring 800 by the guide portion 550 is simplified by the deformability of the flexible substrate. Thereby, the space utilization efficiency can be improved and the power converter 100 can be downsized by improving the assembly workability.

  FIG. 6 is a cross-sectional view of the shielding unit 540 in the power conversion apparatus 100 according to another embodiment when viewed from one surface 520 side.

  The shielding of electromagnetic noise is basically to arrange the shielding part 540 between the electromagnetic noise generating source and the receiving circuit, but the smaller the area where the two spaces separated by the shielding part 540 are in direct contact with each other, It is possible to enhance the shielding effect.

  The shielding part 540 is a part of the flow path forming body 500, and even if the shielding part 540 is enlarged as much as possible, it is difficult to make the shielding part 540 adhere to the casing 1200 of the power conversion device 100. As a method for shielding the gap between the shielding portion 540 and the housing 101, a projection 1210 is provided on the housing 101, and the area where two spaces separated by the shielding portion 540 are in contact with each other is reduced. Therefore, the housing 101 has a protruding portion 1210 that houses the flow path forming body 500 and protrudes toward the shielding portion 540. Thereby, the improvement of the alternating current output precision by the further electromagnetic noise shielding can be aimed at.

DESCRIPTION OF SYMBOLS 100 ... Power converter device 101 ... Housing | casing 200 ... Input voltage, 300a ... Output voltage, 300b ... Output voltage, 300c ... Output voltage, 400 ... Circuit part, 400b ... Power semiconductor module, 500 ... Channel formation body, 510 ... Flow path, 520 ... Surface for storing the power semiconductor module 400b, 530 ... Surface on the opposite side, 540 ... Shielding part, 550 ... Guide part, 570 ... First instruction part, 580 ... Second instruction part, 600 ... First Circuit board, 700 ... second circuit board, 800 ... wiring, 900 ... electromagnetic noise shielding space, 1000 ... DC current, 1100 ... AC current, 1210 ... projection

Claims (7)

A circuit unit (400) in which the voltage value of the input voltage (200) or the output voltage (300) fluctuates during driving;
A flow path forming body (500) that forms a flow path (510) for flowing cooling refrigerant;
A first circuit board (600) disposed at a position facing one surface (520) of the flow path forming body;
The second circuit board (700), wherein the one surface of the flow path forming body is disposed opposite to the other surface (530) on the opposite side;
A wiring (800) that transmits a control signal between the first circuit board and the second circuit board and is disposed across the flow path forming body;
A power converter comprising: a shielding portion (540) provided in the flow path forming body and disposed at a predetermined position (900) sandwiched between the circuit portion and the wiring. The power conversion device according to claim 1,
And a guide section (550) for restricting the wiring so as to remain at the predetermined position. It is the power converter device 100 of Claim 2, Comprising:
The guide part is a power conversion device protruding from the shielding part. The power conversion device according to any one of claims 1 to 3,
A switching circuit unit (400c) that converts a direct current (1000) into an alternating current (1100) and is housed in a housing space (510) formed in the flow path forming body;
The power conversion device, wherein the circuit unit is an AC wiring that transmits the AC current. The power conversion device according to any one of claims 1 to 4,
The flow path forming body has a first support portion (570) and a second support portion (580) connected to a housing (101) that houses the flow path forming body,
The said shielding part is a power converter device integrally formed with the said 1st support part and the said 2nd support part so that the said 1st support part and the said 2nd support part may be connected. The power conversion device according to any one of claims 1 to 5,
The said wiring is a power converter device comprised by a flexible substrate. The power conversion device according to any one of claims 1 to 4 or 6,
A housing for housing the flow path forming body;
The said housing | casing is a power converter device which has a protrusion part (1210) which protrudes toward the said shielding part.

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