KR0131969B1 - Noise filter of a microwave oven - Google Patents

Abstract

In the noise filter for a microwave oven, noise filter circuit parts combined without a base material for absorbing power supply noise from a pair of power supply lines (110 and 112) to bypass it are sealed in an insulation tube (140), a pair of power supply lines (110 and 112) are combined with a main power supply line in parallel, and a grounding line (120) is fixedly connected to a chasis of the microwave oven.

Description

Microwave Noise Filter

1 is a partial perspective view showing an embodiment of the present invention.

2 is a perspective view showing a noise filter of the present invention.

3 is a perspective view showing a noise filter of the prior art.

4 is a circuit diagram of FIG.

5 is a circuit diagram of FIG.

＊ Explanation of symbols for main parts of drawing

110,112 power line 120 ground line

130: bypass capacitor 140: insulating tube

150: varistor

The present invention relates to a noise filter for a microwave oven, and since the noise filter for removing power noise is embedded in an insulating tube without a substrate, the number of parts is reduced, which is simple and inexpensive, and has no influence on waterproof and moisture penetration. A noise filter for a microwave oven, in which no mounting structure is required. In general, a microwave oven is divided into a cooking chamber for putting food and cooking and an electrical room for outputting high frequency. In the electric chamber of the microwave oven, a high voltage transformer for driving the magnetron and a magnetron driven by the high voltage transformer to output high frequency are installed. These components generate various noises, that is, harmful components that interfere with signal transmission by mixing from external or internal paths in the signal transmission system, which is caused by thermal disturbance noise generated inside the device. In addition, there are internal noises such as electric field noise and transistor noises, and external noises that are mixed in from other electric devices or static electricity. Accordingly, in a microwave oven, a noise filter is used to remove various kinds of noises. That is, this is provided in the predetermined part of an electrical equipment room. By the way, in the noise filter for noise reduction of the power source, as shown in FIGS. 3 and 4, various components on the PCB substrate 40, that is, the noise absorbing choke coil 70 and the noise absorbing capacitor 50, are shown. ), The discharge resistor 60, the bypass capacitor 30, the power input terminals 10 and 12, the ground line 20, the fuse 80, etc. were installed, which had the following problems. . First of all, in order to install the various components as described above, the PCB boards on which they are installed must be separately provided, resulting in an expensive defect in terms of price. And the above components had to be installed on the PCB board, which was provided, which had a complicated surface. That is, the above components should be soldered on the PCB board one by one, four power line terminals and one ground line terminal should be connected, and the PCB board installed as described above is placed in the electrical room of the microwave oven. There were two screws for installation, and a separate mounting bracket was used to maintain the separation distance between the chassis surface of the stove and these parts. In addition, the noise filter is installed inside the electric chamber of the microwave oven, and there is a fear that leakage current flows on the chassis surface of the microwave due to moisture accumulated in the electric chamber, thereby causing a user's electric shock. Therefore, the present invention is to solve the above problems, the object of the present invention is not only simple but inexpensive to reduce the number of parts, there is no effect on waterproof and moisture penetration, and also does not require a separate mounting structure It is to provide a noise filter. The present invention seals noise filter circuit components which are connected without a board to absorb power noise from a pair of power lines and bypasses them to a ground line in an insulating tube, and the pair of power lines is a main body of a microwave oven. Parallel connection to the power input line, the ground line is achieved by connecting and fixing to the chassis of the microwave oven. Hereinafter, a preferred embodiment of the present invention for a noise filter for a microwave oven will be described in detail with reference to the accompanying drawings. That is, FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a noise filter of the present invention. As shown in FIG. 1, power noise is absorbed from a pair of power lines 110 and 112. Noise filter circuit components which are connected without a board to bypass the ground line 120 are sealed in the insulation tube 140, and the pair of power lines 110 and 112 are main power input lines of the microwave oven. In parallel to the connection, the ground line 120 is configured to be connected to the chassis of the microwave oven. In addition, the noise filter circuit embedded in the insulation tube 140 is connected between two power lines 110 and 112 to absorb the varistor 150 and the power lines 110 and 112 and the ground line 120. ) Is composed of a bypass capacitor 130 to connect the angle between the circuit to bypass the noise to the ground line (120). The present invention formed as described above is to reduce the components used in the prior art, that is, components such as the noise absorbing capacitor 50, the discharge resistor 60, the noise absorbing choke coil 70 and the like using one varistor 150, Each of the lines 110 and 112 is also used alone, and the varistor 150 and the bypass capacitor 130 are configured to seal the inside of the insulating tube 140. Accordingly, in the present invention, as shown in FIG. 5, the varistor 150 is provided to act as a noise absorbing capacitor 50, a discharge resistor 60, a noise absorbing choke coil 70, and the like. . This reduces the number of parts, simplifying the assembly process. The varistor 150 can be used in the first, the stabilization of the power used in the microwave oven. Second, improvement of development technology, such as the varistor 150 and the bypass capacitor 130, which are components installed inside the microwave oven, may be mentioned. In addition, in the present invention, instead of the conventional substrate, the insulating tube 140, that is, made of a flame retardant P.V.C material is prepared. Since the components constituting the noise filter, that is, the varistor 150, the bypass capacitor 130, and the like are embedded in the insulating tube 140, both ends of the insulating tube 140 are sealed by ultrasonic welding. In this case, since the components of the noise filter are in a sealed state, they are not affected by moisture, and there is no need for an electric shock caused by a short circuit. In addition, the pair of power lines 110 and 112 are connected in parallel to the main power input line of the microwave oven. In addition, the ground line 120 is designed by contact fixing to the chassis of the microwave oven. These power lines 110 and 112 are not in the sealed state in the insulating tube 140, but are exposed. It is also featured that the power lines 110 and 112 are shortened to two lines, which were conventionally four lines. On the other hand, the noise filter of the present invention configured as described above does not have any relation whether it is placed on the side of the battlefield or suspended in the air without the need for a separate fastening bracket or a constant insulation separation distance. That is, no separate fastening structure is necessary. As described in detail above, according to the microwave noise filter of the present invention, the components constituting the noise filter for removing power noise are encapsulated in an insulating tube without a substrate, so that the number of parts is reduced, which is simple and inexpensive. It is a very useful invention that has no influence on penetration and does not require a separate mounting structure.

Claims (2)

In the noise filter for microwave oven, the noise filter circuit components which are connected without a board to absorb power noise from a pair of power lines 110 and 112 and bypass the power line to the ground line 120 are insulated tubes 140. And a pair of power lines 110 and 112 connected in parallel to the main power input line of the microwave oven and connected to and fixed to the chassis of the microwave oven of the ground line 120. Noise filter for the range. The noise filter circuit embedded in the insulation tube 140 is connected between two power lines 110 and 112 and a varistor 150 and each power line 110 and 112 to absorb noise. Noise filter for a microwave oven, characterized in that consisting of a bypass capacitor 130 is connected between the ground line 120 to bypass the noise to the ground line 120.