JPH05136592A - Inverter device - Google Patents

Abstract

(57) [Abstract] [Purpose] Attenuating the noise that enters from the external wiring, etc., drawn into the inverter with a simple structure with a small number of required parts to prevent malfunction of the control circuit. [Structure] A cylindrical body made of a magnetic material such as a ferrite core or a hollow rectangular body with a split structure is fixed near the external wiring inlet of the main body case of the inverter or the terminal block of the control board, and externally passed through the center of the cylindrical body. The wiring is drawn in or the control pattern is penetrated through the center of the hollow rectangular parallelepiped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device capable of attenuating external noise with a simple structure having a small number of required parts to prevent malfunction of a control circuit.

[0002]

2. Description of the Related Art In an inverter device, a control board is generally used to prevent external noise generated from a power line, a control signal line or a connector, a terminal, or the like drawn into the inverter device and invading the control circuit. A bypass circuit or the like, which is grounded via a capacitor, is provided above or in the main circuit.

[0003]

In the above structure, not only the number of required parts increases and the mounting work requires a lot of labor, but also the control board and the like become large in size, and the degree thereof is large in the number of external wiring and terminals. There was a drawback that it increased.

In order to eliminate the above-mentioned drawbacks, the present invention provides
It is an object of the present invention to provide an inverter device capable of preventing malfunction of a control circuit by attenuating external noise with a simple structure having a small number of required components.

[0005]

In order to achieve the above-mentioned object, the present invention, in the first aspect, comprises a magnetic material such as a ferrite core in the external wiring lead-in port 1a provided in the body case 1 of the inverter. The cylindrical body 2 is fixed, and the wiring 3 is drawn through the central portion of the cylindrical body 2. According to the second aspect of the present invention, in the vicinity of the terminal block 5 of the control board 4 of the inverter, a split core made of a magnetic material such as a ferrite core is used. The hollow rectangular body 12 having the structure is fixed, and the control pattern 13 is penetrated through the central portion of the hollow rectangular body 12.

[0006]

The wiring 3 is connected to the cylindrical body 2 or the hollow rectangular body 12.
Alternatively, by passing through the control pattern 13, the external noise is attenuated by a simple structure with a small number of required parts, and the control circuit 1
4 can be prevented from malfunctioning.

[0007]

FIG. 1 shows an embodiment corresponding to claim 1 of the present invention, in which a control board 4 having a terminal block 5 is housed in a box-shaped main body case 1 of an inverter, and a side surface of the case 1 is provided. A lead-in port 1a for drawing in the external wiring 3 such as the power line 3a and the control signal line 3b is appropriately provided. A cylindrical body 2 made of a magnetic material such as a ferrite core is fixed to the lead-in port 1a with an adhesive or the like, and the wiring 3 is drawn in and connected to the terminal block 5 through the central portion of the cylindrical body 2. There is.

FIG. 2 shows an embodiment corresponding to claim 2 of the present invention. FIG. 3 is formed of a magnetic material such as a ferrite core at an intermediate position between the terminal block 5 of the control board 4 of the inverter and the control circuit 14. The hollow rectangular body 12 having the two-divided structure shown is fixed to an attachment hole 15 provided in the control board 4 with an adhesive or the like, and a large number of controls between the terminal block 5 and the control circuit 14 are provided at the center of the hollow rectangular body 12. The pattern 13 is made to penetrate all at once. The hollow rectangular body 12 has a split structure because the hollow body can be easily formed by inserting both ends of each of the split bodies having a U-shaped cross section into the mounting holes 15 from both sides of the control board 4. This is because it is possible to easily increase the cross-sectional area of the hollow portion even if the number of patterns 13 increases.

According to the above-described embodiment, the wiring 3 or the control pattern 13 is passed through the cylindrical body 2 or the hollow rectangular body 12 to generate the external wiring 3 or the connector, the terminal or the like with a simple structure having a small number of required parts. External noise that enters can be attenuated to prevent malfunction of the control circuit 14. Further, by using the cylindrical body 2 or the hollow rectangular body 12, the control board 4 and the like can be downsized. In particular, in the case where the control pattern 13 is passed through, the control pattern 13 is very thin as compared with the wiring 3 Shape 12 to cylindrical body 2
It can be made more compact. Further, since radiation noise from the inverter to the outside is also reduced, it is possible to reduce the influence on peripheral equipment such as a microcomputer.

[0010]

According to the present invention, in the inverter device, a cylindrical body made of a magnetic material such as a ferrite core or a hollow rectangular body having a split structure is fixed near the external wiring inlet of the main body case or the terminal block of the control board. Since the wiring is drawn through the central part of the cylindrical body or the control pattern is penetrated through the central part of the hollow rectangular parallelepiped, the external noise is attenuated by a simple structure with a small number of required parts. It is possible to prevent malfunctions, reduce the size of the control board, and reduce the influence of radiation noise from the inverter on peripheral devices.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment corresponding to claim 1 of the present invention.

FIG. 2 is a plan view of an essential part of an embodiment corresponding to claim 2 of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of Codes] 1 case 1a inlet 2 cylindrical body 3 wiring 4 control board 5 terminal block 12 hollow rectangular body 13 control pattern

Claims (2)

[Claims] 1. A cylindrical body made of a magnetic material such as a ferrite core is fixed to an external wiring lead-in port provided in a body case of the inverter, and the wiring is drawn through the center of the cylindrical body. Inverter device. 2. A hollow rectangular body having a split structure made of a magnetic material such as a ferrite core is fixed near the terminal block of the control board of the inverter, and the control pattern is penetrated through the central portion of the hollow rectangular body. Inverter device.