JP2003347783A - Power conversion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a power conversion apparatus where reduction in size and cost is achieved without deteriorating the cooling performance in the power section. <P>SOLUTION: A power conversion apparatus having a control function for driving an AC motor with a DC power supply has a power section 1 having a semiconductor device, a noise shielding plate 3 that locates between the power section 1 and a control substrate 2 for controlling the power section 1, and a heat sink for cooling 4 thermally coupled with the power section 1. The plate 3 is made of an elastic material and bonded with the power section 1, thereby pressing the power section 1 to the heat sink 4 at a predetermined pressure, and being firmly fixed with the heat sink. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter having a control function of driving an AC motor from a DC power supply, and more particularly to a noise shielding plate for suppressing switching noise in a power section. .

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional power converter. In the figure, reference numeral 1 denotes a power section incorporating a semiconductor chip, 2 denotes a control board for controlling and driving the power section 2, 3
Is a noise shielding plate for suppressing switching noise of the power unit 1, 4 is a cooling heat sink for radiating heat generated in the power unit 1, and 5 is a member having good heat conduction located in a gap between the power unit 1 and the cooling heat sink 4. The configured heat radiation member, 6 is a relay terminal for transmitting control signals of the power unit 1 and the control board 2,
Reference numeral 7 denotes a screw for fixing the noise shielding plate 3, reference numeral 8 denotes a screw for fixing the power unit 1, and reference numeral 9 denotes a support for fixing the control board 2.

Next, the operation will be described. The power module 1 is controlled and driven by the control board 2 to convert DC power supplied from an external DC power supply (not shown) to AC power. The power unit 1 is fixed to the cooling heat sink 4 with screws 8 and the noise shielding plate 3 is fixed with screws 7.

[0004]

Since the conventional power converter is configured as described above, the fixing of the power section and the fixing of the noise shielding plate are separate mechanisms, so that the power section becomes larger and more expensive. Cost was a problem.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a power conversion device that can be reduced in size and cost without impairing the cooling performance of a power unit.

[0006]

According to a first aspect of the present invention, there is provided a power converter having a control function of driving an AC load by a DC power supply, wherein a power unit provided with a semiconductor element of the power converter is provided. A noise shielding member positioned between the power unit and a control board that controls the power unit, a cooling member thermally coupled to the power unit, wherein the noise shielding member is made of an elastic material, The power part is pressed and fixed to the cooling member at a predetermined pressure by joining with the power part.

In the power converter according to the second invention, the first
In the invention, the noise shielding member is made of a plate-like elastic material, and the noise shielding member is bent and formed to attach the noise shielding member to the cooling member. The noise shielding member is provided with a curved portion that is curved, and the noise shielding member is attached to the heat dissipation member by the attachment portion, and the power portion is fixed to the heat dissipation member by joining the curved portion with the power portion. They are pressed and fixed by pressure.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment according to the present invention will be described with reference to FIG. FIG. 1 shows Embodiment 1
It is a side view which shows the structure of the power converter in FIG. In the drawings, the same reference numerals as those in the conventional example indicate the same or corresponding parts.

In FIG. 1, reference numeral 1 denotes a power section containing a semiconductor element formed of a semiconductor chip, 2 denotes a control board for controlling and driving the power section 2, 3 denotes a noise shielding plate for suppressing switching noise of the power section 1, Is a cooling heat sink that radiates heat generated by the power unit 1, 5 is a heat radiating member that is located in a gap between the power unit 1 and the cooling heat sink 4 and that transmits heat of the power unit 1 to the cooling heat sink 4 and that is made of silicon grease or the like. , 6 are relay terminals for transmitting control signals for the control board 2 and the power section 1, 7 are screws for fixing the noise shielding plate 3, and 9 is a support for fixing the control board 2.

The noise shielding plate 3 is made of an elastic member, and has a bent attachment portion 3a and a curved portion 3b. The mounting portion 3a is screwed to the heat sink 7 for cooling.
The noise shielding plate 3 is fixed to the heat sink 7 for cooling by tightening, and the curved portion 3b of the noise shielding plate 3 is pressed against the upper surface of the power unit 1 so that the heat radiating sheet and the power unit 1 It is pressed and fixed to a cooling heat sink 7 via a heat radiating member 5 such as silicone grease.

In the first embodiment, the power section 1 is fixed to the power section 1 by applying a pressure downward from the upper surface of the power section 1 with a noise shielding plate 3 having a spring mechanism formed by a curved section 3b. A fixing mechanism such as a fixing screw hole is not required. The spring mechanism formed by the curved portion 3b of the noise shielding plate 3 has a power portion 1 with an appropriate spring force design.
Can be brought into contact with the heat dissipating member 5 such as a heat dissipating sheet or silicone grease at an appropriate pressure, and the cooling effect can be improved.

As described above, since the fixing mechanism of the power section 1 is shared with the noise shielding plate 3, the fixing mechanism of the power section 1 and a fixing member such as a screw are not required. The effect of size reduction and cost reduction can be obtained without impairing.

According to an embodiment of the present invention, in a power converter having a control function of driving an AC load by a DC power supply, a power unit 1 provided with a semiconductor element of the power converter, the power unit 1 and the power unit 1 A noise shielding member composed of a shielding plate 3 located between the power unit 1 and a control board that controls the power unit 1, and a cooling member thermally coupled to the power unit 1 via a heat radiation member 5 composed of a heat radiation sheet or silicone grease. A cooling member comprising a heat sink 4; a noise shielding member comprising the noise shielding plate 3 formed of a plate-shaped elastic material; and a noise shielding member comprising the noise shielding plate 3 being bent and formed. A mounting portion 3a for mounting a noise shielding member to a cooling member comprising the cooling heat sink 4;
A noise shielding member made of the noise shielding plate 3 is provided with a curved portion 3b which is formed to be curved, and the noise shielding member made of the noise shielding plate 3 is connected to a cooling member made of the cooling heat sink 4. The power portion 1 is pressed and fixed at a predetermined pressure to a cooling member made up of the cooling heat sink 4 by joining the bending portion 3b with the power portion 1 by being attached by the attachment portion 3a. The power section is pressed against the heat radiating member with a predetermined pressure and fixed by the curved section formed by the curve, so that the cooling performance of the power section is not impaired, and the power section is compact and compact.
It is possible to obtain a power conversion device that can be reduced in cost.

[0014]

According to the first aspect of the present invention, the power section is pressed against the cooling member with a predetermined pressure by the noise shielding member made of an elastic material and is fixed, so that the cooling performance of the power section is not impaired and the power section is compact. -It is possible to obtain a power conversion device that can be reduced in cost.

According to the second aspect of the present invention, the power portion is pressed against the cooling member with a predetermined pressure by the curved portion of the noise shielding member made of an elastic material and is fixed, without impairing the cooling performance of the power portion. A power converter that can be reduced in size and cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a power conversion device according to a first embodiment of the present invention.

FIG. 2 is a side view illustrating a configuration of a power conversion device according to a conventional technique.

[Explanation of symbols]

1 power part, 2 control board, 3 noise shielding plate, 3a
Mounting part, 3b curved part, cooling heat sink, 5
Heat dissipation member, 6 relay terminals, 7 screws, 8 screws.

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 5E321 AA02 AA05 CC22 GG01 GG05                       GH03                 5E322 AA11 AB01 AB04 EA11 FA04                 5H007 AA01 BB06 HA03 HA04 HA05

Claims (2)

[Claims] 1. A power converter having a control function of driving an AC load by a DC power supply, wherein a power unit provided with a semiconductor element of the power converter, and a power unit and a control board for controlling the power unit are provided. A noise shielding member, a cooling member thermally coupled to the power portion, wherein the noise shielding member is made of an elastic material, and the power portion is connected to the cooling member by joining with the power portion. A power conversion device characterized by being pressed and fixed at a predetermined pressure. 2. The noise shielding member is formed of a plate-like elastic material, and is formed by bending the noise shielding member to attach the noise shielding member to the cooling member; The noise shielding member is provided with a curved portion formed to be curved, and the power portion is attached to the heat radiating member by joining the curved portion with the power portion by attaching the noise shielding member to the heat radiating member by the attaching portion. The power conversion device according to claim 1, wherein the power conversion device is pressed and fixed at a predetermined pressure.