JP2505226Y2 - Outlet type noise filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline of Field] The present invention relates to a noise filter for protecting a device other than a controlled device from a carrier signal in a power carrier monitoring and controlling device.

[Contents and problems of conventional technology]

Conventionally, a common mode noise filter having a circuit configuration shown in FIG. 5 has usually been inserted into a circuit for the purpose of inserting it into an electronic circuit from the outside or controlling electromagnetic noise radiated to the outside. This noise filter has a structure in which one common mode choke coil and four capacitors are combined in a case with concentricity, and the resonance point is about 5 MHz.

Since the conventional noise filter has a resonance point at a high frequency, when it is used in a home automation system using a spread spectrum method of a power line carrier system, which is currently being put into practical use, its effect as a noise filter is small and There is a problem that the amount of attenuation is too low and not sufficient for the purpose of controlling the noise by using it in a circuit of a power line carrier system.

[Purpose of device]

The present invention is a case in which the shape of the case that houses the noise filter is an outlet, and one inductor and one capacitor are combined in an inverted L shape so that sufficient attenuation can be obtained even when inserted in the power line, and a resonance point near 550 KHz. The constant of the inductor and the capacitor is determined so that it has a large attenuation in the range of 100KHz to 600KHz which is the frequency band of the spread spectrum method of the home automation system, and it is a plug-in type noise that is inserted in the round trip line where the signal propagates. It is a filter.

[Constitution of device]

The present invention relates to a noise filter for blocking a carrier signal in a device other than a control device of a power line carrier monitoring and control device that superimposes a carrier signal according to a spread spectrum method on a power line, which is iron, iron silicon alloy, or iron. An inductor in which a wire is wound around an annular magnetic core made of a powder of an aluminum alloy, iron-silicon / aluminum alloy, iron-based amorphous alloy, or the like, or an iron-based powder core mixed with powder of the alloy, and the inductor. An outlet-type noise filter characterized in that an inverse L-shaped filter having a resonance frequency of approximately 550 KHz is formed by a capacitor and is housed in an outlet.

[Explanation by Examples]

FIG. 1 is an external view of a noise filter according to the present invention. In the figure, the inductor 1 has a dust core mainly made of iron (outer diameter 33.2 mm, inner diameter 20 mm) and a copper wire φ2.3 wound 20 times. In the embodiment of the present invention, the inductance value is 30 μH.
The inductor of is used, and 2.2 between the live line and the neutral line.
A μF film capacitor is connected to form an inverted L type filter. The inductor is placed on the live wire side and the neutral wire side is connected with a copper wire of φ2.3.

The noise filter according to the present invention is a circuit system of spread spectrum method for signal transmission in home automation system, and is used for the device which does not receive the control signal, therefore, the high attenuation amount in a wide range of frequency band from 100KHz to 600KHz is achieved. It must be portable, compact, and inexpensive. In addition, commercial 50Hz is used for the coil that goes in series with the live line.
Or, since a 60Hz signal flows, the magnetic core should not cause magnetic saturation due to the rated current. Therefore, in the noise filter of the present invention, a powder core made of iron or iron base (iron-silicon alloy, iron-aluminum alloy, iron-base amorphous alloy, etc.) is used as the magnetic core, and the attenuation amount is in the range of 100 KHz to 600 KHz. The noise filter is configured to maximize the noise.

FIG. 4 shows the attenuation characteristics of the noise filter according to the present invention, which includes a 30 μH inductor using a dust core and 2.2 μ
It is a characteristic when the circuit of FIG. 3 is used for the F film capacitor.

The noise filter of the present invention is housed in an outlet having the structure shown in FIG. FIG. 1 is a view seen from above except the upper lid of the outlet type noise filter according to the present invention. Inside the outlet, an inductor 1, a capacitor 2, a plug-in type output terminal 7, an input terminal 6 and an input terminal are provided. It is composed of a connecting cable 8 and a case 5 for housing these. As shown in FIG. 2, the upper case of the input terminal of the outlet is provided with socket insertion holes 9 and 10 having different hole sizes, and the live wire side insertion hole 9 and the neutral wire side insertion hole 10 are immediately visually discerned. There is a configuration that can.

In the embodiments of the present invention, the 2.2 μF film capacitor is used as the capacitor forming the noise filter, but other types of capacitors may be used for the noise filter.

[Effect of device]

As described above, according to the present invention, the number of components is smaller than that of the conventional noise filter, and the spread spectrum signal transmission method, which is a power line carrier signal system in home automation systems, is used to protect uncontrolled devices from carrier signals. It is now possible to provide a noise filter with high attenuation characteristics that is housed in a power outlet.

[Brief description of drawings]

FIG. 1 is a plan view showing the arrangement and shape of parts housed in an outlet of a noise filter according to the present invention. FIG. 2 is a plan view showing an insertion hole on the outlet case side. FIG. 3 is a circuit diagram of a noise filter according to the present invention. FIG. 4 is a diagram showing the attenuation amount with respect to the same wave number in the embodiment of the noise filter of the present invention. FIG. 5 shows the circuit system of the noise filter used conventionally. 1 ... Inductor. 2 ... Capacitor. 3 ... resistance. 4 ... Lead wire. 5 ... Case. 6 ... Input terminal. 7 ... Output terminal. 8 ... Cable. 9 ... Plug in the live line side. 10 ... Insert the neutral wire side.

Claims (1)

(57) [Scope of utility model registration request] 1. A noise filter for blocking a carrier signal in a device other than a control device of a power line carrier monitoring and control device, wherein a carrier signal according to a spread spectrum method is superimposed on a power line, comprising iron, iron-silicon alloy, or An inductor in which a wire is wound around an annular magnetic core made of a powder of iron-aluminum alloy, iron-silicon-aluminum alloy, or iron-based amorphous alloy, or an iron-based powder magnetic core in which powder of the alloy is mixed, and the inductor. An outlet-type noise filter characterized in that an inverse L-shaped filter having a resonance frequency of approximately 550 KHz is formed by the capacitor and a capacitor, and is housed in an outlet.