JP3405035B2 - Inverter device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device.

[0002]

2. Description of the Related Art Conventionally, an electric vehicle is provided with an inverter device, and a bridge circuit of the inverter device is driven to generate a three-phase current, and the current is supplied to a motor. . Therefore, a control device is provided, the control device generates a pulse width modulation signal, outputs the pulse width modulation signal to the bridge circuit, and turns on a transistor forming the bridge circuit.
I'm trying to turn it off.

By the way, in order to downsize the inverter device, the bridge circuit and the control device are divided and mounted on the heat sink in two layers. FIG. 2 is a partial sectional view of a conventional inverter device. In the figure, reference numeral 11 denotes a heat sink plate which is fixed above a motor case (not shown) by bolts (not shown) to form a heat sink. The fin 21 is formed. Reference numeral 12 denotes an inverter case which is fixed on the heat sink plate 11 by a bolt b1 and forms an inverter accommodating chamber 14 together with the heat sink plate 11, and a bridge circuit 18 and a control unit 19 are accommodated in the inverter accommodating chamber 14. It

In this case, the heat sink plate 11
Brackets 16 and 17 are fixed to bolts b2 and b3, and the control unit 19 is supported by the brackets 16 and 17. The control device unit 19 has a shield case 25, and the control device 26 and the control circuit board 22 are accommodated in the shield case 25. Therefore, it is possible to prevent the control circuit board 22 from being affected by noise, electromagnetic waves, etc. generated by the bridge circuit 18.

A bridge circuit 18 is arranged below the control unit 19, and the bridge circuit 18 is provided.
Is composed of a smoothing capacitor 31 for smoothing the current supplied from a battery (not shown), three transistor modules 32 arranged in the depth direction in the drawing, each of which includes a pair of transistors (not shown). The capacitor 31 includes a positive electrode terminal 34 and a negative electrode terminal 35. The positive electrode terminal 34 is connected to a positive electrode terminal 37 of each transistor module 32 via a bus bar 36 and the negative electrode terminal 35.
Is connected to each transistor module 3 via the bus bar 38.
2 is connected to each of the negative electrode terminals 39, and a voltage is applied to each transistor of each transistor module 32. The output terminal 41 of each transistor module 32 is
It is connected to the connection terminal 43 of the connecting member 45 via the bus bar 42, and outputs each phase current generated by turning on / off the transistor to the connecting member 45.

The connecting member 45 is connected to the motor in the motor case housed in the motor case and supplies each phase current to the motor. Reference numeral 46 is a current detector for detecting a current flowing through the connecting member 45.
1 is provided so as to penetrate the heat sink plate 11, and the negative electrode terminal 3 of the capacitor 31 is interposed via the bus bar 57.
A bush 52 for accommodating a lead wire (not shown) connected to 5 is arranged to penetrate the heat sink plate 11, and accommodates a lead wire (not shown) connected to the positive terminal 34 of the capacitor 31 via the bus bar 58. Bushings 53 to 55 are bushes that are arranged so as to penetrate the heat sink plate 11 and that accommodate lead wires (not shown) that connect the control device 26 and various sensors (not shown).

[0007]

However, in the above-mentioned conventional inverter device, the brackets 16 and 17 are fixed to the heat sink plate 11, and the bracket 1
Since the shield case 25 is supported by 6 and 17 and the control circuit board 22 is accommodated in the shield case 25, a space for disposing the brackets 16 and 17 and the shield case 25 is required. Therefore, the inverter accommodating chamber 14 has to be enlarged accordingly. Therefore, the inverter device becomes large.

Further, in order to prevent noises, electromagnetic waves, etc. generated by the bridge circuit 18 from affecting the control circuit board 22, a shield plate is used in place of the shield case 25, and the shield plate is bridged. It is also possible to arrange it between the circuit 18 and the control circuit board 22. However, since a bracket or the like is required to dispose the shield plate, the inverter accommodating chamber 14 must be made larger by that amount, and similarly, the inverter device becomes large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional inverter device and to provide an inverter device capable of reducing the size of the inverter accommodating chamber.

[0010]

Therefore, in the inverter device of the present invention, a heat sink plate which constitutes a heat sink and an inverter case which integrally includes a top wall portion and forms an inverter accommodating chamber with the heat sink plate are provided. A control circuit board that is accommodated in the inverter accommodating chamber and fixed to the top wall portion and outputs a pulse width modulation signal; and a control circuit board that is accommodated in the inverter accommodating chamber and fixed to the heat sink plate. A bridge circuit that generates a phase current based on a pulse width modulation signal output from the circuit board. The inverter case is disposed above the heat sink plate with the control circuit board fixed to the top wall facing the bridge circuit.

In another inverter device of the present invention,
Further, the control circuit board includes a signal layer having a pattern, and a shield layer formed on the bridge circuit side of the signal layer and grounded. In yet another inverter device of the present invention, the inverter case is formed of a conductive material and electrically connected to the shield layer.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a vertical cross-sectional view of an inverter device according to an embodiment of the present invention, FIG. 3 is a horizontal cross-sectional view of an inverter device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of an inverter device according to an embodiment of the present invention. 5 is an exploded perspective view of the control circuit board according to the embodiment of the present invention.

In the figure, reference numeral 11 denotes a metal heat sink plate which is fixed above a motor case (not shown) by bolts (not shown) and constitutes a heat sink. The lower surface of the heat sink plate 11 faces the motor case. A plurality of heat radiation fins 21 are formed by projecting. Further, 62 is the heat sink plate 11
Is an inverter case that is fixed by an elastic clamp 61 and forms the inverter housing chamber 14 together with the heat sink plate 11, and is formed of a conductive material. Then, the bridge circuit 18 and the controller unit 63 are housed in the inverter housing chamber 14.

In this case, the inverter case 62 has a top wall portion 62a, a side wall portion 62b extending downward from a peripheral edge of the top wall portion 62a, and a flange portion 62c extending outward from a lower end of the side wall portion 62b, The flange portion 62c and the peripheral edge of the heat sink plate 11 have the elastic clamp 61.
It is elastically pinched by. Also, the top wall portion 62a
Further, the control circuit board 64 of the control device unit 63 is fixed by the screws b4 to b6, and lead wires (not shown) connecting the control circuit board 64 and various sensors (not shown) are connected to the lower surface of the control circuit board 64. Connector 6 for
5, 66, a connector 67 and the like for connecting a lead wire (not shown) that connects the control circuit board 64 and other elements in the inverter accommodating chamber 14 are arranged,
On the upper surface of the control circuit board 64, chip components 71 to 73 for driving the bridge circuit 18 are arranged.

A bridge circuit 18 is arranged below the control unit 63, and the bridge circuit 18 is provided.
Is composed of a smoothing capacitor 31 for smoothing current supplied from a battery (not shown), a transistor module 32 including three pairs of transistors (not shown) arranged in the depth direction in FIG. The capacitor 31 includes a positive electrode terminal 34 and a negative electrode terminal 35,
The positive electrode terminal 34 is connected to the positive electrode terminal 37 of each transistor module 32 via the bus bar 36 and the negative electrode terminal 35.
Each transistor module 32 through the bus bar 38
And is applied to each transistor of each transistor module 32. The output terminal 41 of each transistor module 32 is
Each phase current, which is connected to the connection terminal 43 of the connecting member 45 via the bus bar 42 and is turned on / off by the pulse width modulation signal output from the control circuit board, is applied to the connecting member. Output to 45.

The connecting member 45 is connected to the motor housed in the motor case and supplies each phase current to the motor. Therefore, by driving the motor, the drive wheels of the electric vehicle can be rotated to drive the electric vehicle. In addition, 46 is a current detector that detects a current flowing through the connecting member 45, and 51 is arranged so as to penetrate the heat sink plate 11,
A bush 52 for accommodating a lead wire (not shown) connected to the negative terminal 35 of the capacitor 31 is provided so as to penetrate the heat sink plate 11, and accommodates a lead wire (not shown) connected to the positive terminal 34 of the capacitor 31. Bush.

In this case, since the control circuit board 64 is attached to the top wall portion 62a of the inverter case 62, it is not necessary to dispose a bracket in the inverter accommodating chamber 14. Therefore, the inverter accommodating chamber 1
4 can be reduced, and the inverter device can be reduced in size. Further, since the control circuit board 64 can be assembled to the inverter device without using the bracket, the fixed portion is reduced. Therefore, the durability of the inverter device does not deteriorate even if vibrations occur as the electric vehicle travels.

Further, in order to prevent noise, electromagnetic waves, etc. generated by the bridge circuit 18 from affecting the control circuit board 64, a shield means is provided on the surface of the control circuit board 64 facing the bridge circuit 18. It is arranged. That is, the control circuit board 64 includes a signal layer 81 formed to face the top wall portion 62 a of the inverter case 62, a power source plus layer 82 formed on the bridge circuit 18 side of the signal layer 81, and a power source plus layer 82. The power supply minus layer 83 formed on the bridge circuit 18 side and the shield layer 84 as a shield means formed on the bridge circuit 18 side from the power supply minus layer 83, and the signal layer 81 and the power supply plus layer 82. Power supply plus layer 8
2 and the power source minus layer 83 and the power source minus layer 83
Between the insulating layer 85 and the shield layer 84.
Is provided.

A pattern (not shown) is formed on the signal layer 81, and the chip parts 71 to 71 are formed.
73 and the like are fixed by solder or the like. The power source plus layer 82 is connected to a positive electrode terminal of a battery (not shown), a positive side of a power source voltage for operating the control unit 63 is applied to the power source plus layer 82, and the current minus layer 83 is a battery (not shown). Of the power supply voltage for operating the controller unit 63 is applied to the current minus layer 83, and the chip parts 71 to 73, etc. are connected to each of them. Further, the shield layer 84 is electrically connected to the inverter case 62 via the screws b4 to b6, and is electrically connected to the casing of the inverter device via the inverter case 62 and the heat sink plate 11. In this case, in order to stabilize the potential of the control device unit 63, the power source plus layer 82 is not connected to the negative electrode terminal of the battery.

As described above, the shield layer 84 is a metal layer formed by solid coating, and is grounded through the inverter case 62 and the heat sink plate 11 so that the potential becomes zero, so that the signal layer 81 is formed. Can be shielded to prevent the noise, electromagnetic waves, etc. generated by the bridge circuit 18 from affecting the control circuit board 64.

Since the inverter case 62 is made of a conductive material, the inverter case 6
2 can be used as grounding means. Therefore, it is not necessary to provide a special grounding means for grounding the shield layer 84, so that the inverter device can be downsized and the cost can be reduced.

In this embodiment, the insulating substrate 85 is used.
To 87 are formed by laminating an epoxy resin on a glass cloth base material. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

[0023]

As described in detail above, according to the present invention, in the inverter device, the heat sink plate constituting the heat sink and the top wall portion are integrally provided,
An inverter case that forms an inverter accommodating chamber with the heat sink plate, a control circuit board that is accommodated in the inverter accommodating chamber, is fixed to the top wall portion, and outputs a pulse width modulation signal, and is accommodated in the inverter accommodating chamber. And a bridge circuit that is fixed to the heat sink plate and that generates a phase current based on the pulse width modulation signal output from the control circuit board. The inverter case is disposed above the heat sink plate with the control circuit board fixed to the top wall facing the bridge circuit.

In this case, the electric current generated by the bridge circuit can be supplied to the motor to drive the motor. Further, since the control circuit board is fixed to the top wall portion of the inverter case, it is not necessary to dispose the bracket in the inverter accommodating chamber. Therefore, the inverter accommodating chamber can be made smaller,
The inverter device can be downsized.

In another inverter device of the present invention,
Further, the control circuit board includes a signal layer having a pattern, and a shield layer formed on the bridge circuit side of the signal layer and grounded. In this case, since the potential of the shield layer is set to 0, the signal layer is shielded and the noise generated by the bridge circuit,
It is possible to prevent electromagnetic waves and the like from affecting the control circuit board.

In yet another inverter device of the present invention, the inverter case is made of a conductive material and is electrically connected to the shield layer. In this case, since the inverter case is made of a conductive material, the inverter case can be used as the grounding means. Therefore, it is not necessary to dispose a special grounding means for grounding the shield layer, so that the inverter device can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an inverter device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a conventional inverter device.

FIG. 3 is a horizontal sectional view of the inverter device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of the inverter device according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view of the control circuit board according to the embodiment of the present invention.

[Explanation of symbols]

11 heat sink plate 14 Inverter housing room 18 bridge circuit 62 inverter case 62a Top wall 64 control circuit board 81 Signal layer 84 Shield layer

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-7994 (JP, A) JP-A-7-75215 (JP, A) JP-A-7-115778 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H02M 7/48

Claims (3)

(57) [Claims] 1. A heat sink plate that constitutes a heat sink, and an inverter case that integrally includes a top wall portion and forms an inverter accommodating chamber together with the heat sink plate;
Is fixed to the front Kiitadaki wall portion, and a control circuit board for outputting a pulse width modulation signal, while being accommodated in the inverter accommodation chamber, the heat sink plate is fixed, pulse-width modulation signal outputted from the control circuit board which has a bridge circuit for generating a phase current based on the previous
The inverter case is a control circuit fixed to the top wall.
The heatsink board with the circuit board facing the bridge circuit.
An inverter device, which is arranged above the rate . 2. The inverter device according to claim 1, wherein the control circuit board includes a signal layer on which a pattern is formed, and a shield layer formed on the bridge circuit side of the signal layer and grounded. 3. The inverter device according to claim 2, wherein the inverter case is made of a conductive material and is electrically connected to the shield layer.