JPS6014515A - Noise filter - Google Patents

Abstract

PURPOSE:To improve the workability of windings by producing windings n1 and n2 having a small diameter and winding N1 and N2 having a large diameter with one wire respectively and constituting them so that magnetic fluxes have additive polarities and using open ends of windings n1 and N1 as power supply terminals and using open ends of windings n2 and N2 as load terminals. CONSTITUTION:The winding n1 having the small diameter and the winding N1 having the large diameter where magnetic fluxes are in directions opposite to each other are wound around one leg of a frame magnetic core 1, and the winding n2 having the small diameter and the winding N2 having the large diameter are wound around the other leg. Windings n1 and n2 having the small diameter and windings N1 and N2 having the large diameter are constituted with one wire respectively and are connected in series, and they are so constituted that magnetic fluxes have additive polarities. Series windings n1 and n2 and series windings N1 and N2 are connected by one wire respectively as shown in a figure, and windings n1 and n2 are inserted to windings N1 and N2 to obtain double-layered windings, and they are bent into a channel shape and are inserted to both legs of the frame magnetic core 1 simultaneously. Open ends of windings n1 and N1 are used as power supply terminals t1 and t1', and those of windings N2 and n2 are used as load terminals t2 and t2'.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a noise filter used in electronic equipment such as copying machines and vending machines.

Conventional configurations and their problems Recently, in electronic equipment such as copying machines and vending machines,
Noise filters are used to prevent noise generated within electronic devices from traveling to the outside via power lines, and to prevent noise from power lines from entering electronic devices and causing them to malfunction.

A conventional noise filter was constructed as shown in FIG. Winding wire N1. N
2 and connect one end of each to the power terminal t1. It is connected to the AC or DC power supply 2 as terminal t1', and the other terminal t2. t2
' is connected to the load 3, and the power supply terminal t1. Capacitors C1 and C1' are connected between t1', and terminal t2
．． A capacitor C2°02' was also connected between t2', and intermediate connection points between capacitors C1 and 01' and between C2 and 02' were grounded.

In this configuration, each winding N1
and N2 generate magnetic fluxes φ1 and φ2, but since they are connected with polarities that cancel each other out, most of them are canceled out, but due to magnetic resistance, leakage magnetic fluxes that do not interlink with each other remain.

This leakage magnetic flux causes the winding N1. The magnetic flux of the N2 magnetic core 1 becomes saturated, and the inductance value decreases significantly, making it impossible to increase the number of turns and increasing the inductance value.

In order to eliminate such drawbacks, noise filters as shown in FIGS. 2 to 4 have been developed.

In other words, the magnetic flux generated by passing a current through one leg of the frame-shaped magnetic core 1 is generated by winding the large-diameter winding N1 and the small-diameter winding N1 in opposite directions, and by passing the same current through the other leg. The structure is the same as that shown in FIG. 1 except that the large diameter winding N2 and the small diameter winding n2 are wound in opposite directions.

And the above windings N1 and N2 + and windings N2 and nl
are in series with each other, and the winding N in series is
1 and N2 + nl and N2 are configured so that the magnetic flux has additive polarity.

As shown in Figure 3, these series windings are made by combining two wires with a large diameter part and a small diameter part bent into a U-shape as shown in Figure 3 to form a double layer. By forming a winding wire and incorporating it into the magnetic core 1, it becomes as shown in FIG.

With this configuration, windings N1 and n2+ N2 and n
Since the leakage magnetic flux between 1 and 1 is extremely small, the magnetic flux does not become saturated, and since the number of turns can be increased, the inductance value can be increased, and the damping effect is also increased.

However, the large diameter winding N1 t or N2 and the small diameter winding n
2 or nl are wound in series, bent, and assembled into the combination magnetic core 1, there was a problem in that it was difficult to automate the winding work and perform the single combination work.

OBJECTS OF THE INVENTION The present invention is intended to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a noise filter in which winding work can be automated and windings can be easily combined.

Structure of the Invention In order to achieve the above object, the present invention comprises a frame-shaped magnetic core and a large diameter winding n1 which is wound in two layers around one leg of the magnetic core and generates magnetic flux in opposite directions when current flows through the core. It consists of a diameter winding N1, a small diameter winding N2 and a large diameter winding N2, which are similarly wound in two layers around the other leg of the magnetic core and generate magnetic flux in opposite directions when current flows through them. The wires n1 and N2 and the large diameter windings N1 and N2 are each made of one wire, and the windings n1, N2 and N
1 and N2 have additive polarity, respectively, and the above winding n1
The open end of +N1 is used as a power supply terminal, and the open end of winding n2. N
The open end of 2 is used as the load terminal, and a capacitor is connected at least between the power supply terminals or between the load terminals, and the windings can be continuously wound with the same diameter. It is also easy to incorporate.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 to 7 of the drawings.

That is, as shown in FIG. 6, a small-diameter winding n1 and a large-diameter winding N1 are wound so that the magnetic fluxes generated by passing a current through one leg of the frame-shaped magnetic core 1 are opposite to each other. The magnetic fluxes generated by passing a current through the other leg of the magnetic core 1 are wound in opposite directions [dawn] by winding a small-diameter winding n2 and a large-diameter winding N2.

The small-diameter windings n and N2 and the large-diameter windings N1 and N2 are each made of one wire and are connected in series, and the series small-diameter windings n1 and N2 + large-diameter winding N1 and N
2 is configured so that the magnetic flux has additive polarity.

That is, if the magnetic flux due to the large diameter winding N1Vc is φ1, the magnetic flux due to the large diameter winding N2 is φ2, and the magnetic flux due to the small diameter winding n1 is φ. ', the magnetic flux of the small-diameter winding n2 becomes φ2', and the direction of each magnetic flux has an additive polarity.

These series windings n1 and N2 . N1 and N2 are each continuously wound with one wire as shown in Figure 6.
The small diameter windings N1 and N2 are inserted into the large diameter windings N1 and N2 to form a double layer winding, which is bent into a U-shape as shown in FIG. The configuration is such that it can be installed at the same time.

Constructing the winding wires of the same diameter continuously with one wire in this way allows the winding work to be extremely efficient because the winding wires are simply wound continuously around the winding core of the same winding machine. However, according to this configuration, there is a difference in DC resistance between the two series windings, which may affect the attenuation characteristics, but in this case, the large diameter winding N1. N2 and small diameter winding 5in1. This can be handled by changing the wire diameter of n2.

Further, the open ends of the windings n1 and N1 are connected to the power supply terminal t1. t
1' to the AC or DC power source 2, and the open ends of the windings N2 and N2 are connected to the load terminals t2. A load 3 is connected as t2', and a capacitor C1,0 is connected between the power supply terminals t1 and 12.
1' is connected, capacitors C2 and 02' are connected between the load terminals t2 and 127, and intermediate connections between capacitors C1 and 01' and C2 and 02' are grounded.

The above capacitor is connected to the power supply terminal t1. It is not necessary to connect both between t1' and between load terminals t2 and 12'; either one may be used.

With the above configuration, the small diameter windings n1 and N2. and N1 and N
2, and the directions of magnetic flux generated in each winding cancel each other, making it difficult for the magnetic flux caused by the load current to saturate.

Therefore, since a large number of turns can be taken, the terminal t1. The interaction value between t2 or t1' and 127 also increases, and the attenuation effect as a filter also increases.

Effects of the Invention By configuring the noise filter of the present invention as described above, the coupling coefficient of the winding can be increased to increase the damping effect, and the winding work can be performed automatically by continuously winding wires of the same diameter. This makes it extremely efficient, and it also has the advantage of being extremely easy to combine large-diameter and small-diameter windings by simply inserting them from one direction, making it easy to incorporate into frame-shaped magnetic cores, and being advantageous in terms of cost. , is of great industrial value.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional noise filter, Fig. 2 is a circuit diagram showing another conventional example, Fig. 3 is an explanatory diagram of the winding section, and Fig. 4 is a circuit diagram of a conventional noise filter.
The figure is a perspective view of the winding section, FIG. 6 is a circuit diagram showing an embodiment of the noise filter of the present invention, and FIGS. 6 and 7 are explanatory diagrams showing the assembly sequence of the winding section. be. 1...Frame type magnetic core, nl, N2...small diameter winding, N1゜N2...large diameter winding, tl, t1'.
...Power terminal, t2゜t2'...Load terminal -CI + CI'' + C2, C2'...
capacitor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4

Claims (1)

[Claims] A frame-shaped magnetic core, a small-diameter winding n1 and a large-diameter winding N1 that are wound in two layers around one leg of the magnetic core and generate magnetic flux in opposite directions when current flows through them, and the other leg of the magnetic core has the same structure. A small-diameter winding n2 and a hollow gland N that are wound in two layers and generate magnetic flux in opposite directions when current flows through them.
2, the small-diameter windings n1 and N2 and the large-diameter windings N1 and N2 are each made of one wire, and the magnetic fluxes of the windings n1 and N2 and N1 and N2 are additive, and the above-mentioned windings A noise filter in which the open ends of wires n1 and N1 are used as power supply terminals, the open ends of windings n2 and N2 are used as load terminals, and a capacitor is connected between at least one of the power supply terminals and the load terminals.