JPH054270Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a winding frame around which a winding is wound and a split type magnetic core in a common mode choke coil for preventing electromagnetic noise used in power supply circuits of electronic devices. , relates to a common mode York coil fixed using a resin core fixing holder.

Common mode choke coils (hereinafter referred to as coils) for electromagnetic noise prevention that use a toroidal magnetic core are difficult to automate, and installation of the coils requires a mounting stand, etc. Because of the drawbacks such as the troublesome processing of the lead wires at the ends, common mode choke coils using split magnetic cores have been put into practical use in large quantities.

The common mode York coil using this split type magnetic core has a plurality of flanges around the outer periphery of a cylindrical core made of electrically insulating resin, and two or more flanges are installed on the winding frame with pin terminals implanted at the base of the flanges. Wind the set of windings, connect the ends of the windings to the pin terminals, insert one leg of a UU type ferrite core, which is a split magnetic core, into the center hole of the winding core as the inner leg, and insert the outer leg into the center hole of the winding core. is positioned outside the winding, and the tip of each leg is butted against each other to form a magnetically closed magnetic path. Conventionally, in order to fix the split type magnetic core, stainless steel or phosphor bronze was used. Hold the outer circumference of the split magnetic core with a U-shaped metal fitting, and then impregnate the entire coil with insulating varnish or fix it with adhesive to fix the split magnetic core and the winding frame with the wire wound. was.

In the conventional common mode cheese yoke coil using a split type magnetic core, the winding itself is easy to automate, but the final process of adhering the winding frame and the split type magnetic core and impregnating with varnish is a laborious process. It takes time for varnish to dry, which is an obstacle to producing products at low cost.

The purpose of this invention is to provide a common mode tie-yoke coil using a split magnetic core that can be assembled at a low cost and in a short working time. In the common mode York coil in which a split magnetic core is assembled to this winding frame, resin is used to hold down the outer periphery of the split magnetic core from both sides and to engage and fix it with the collar of the winding frame. The common mode chiyoke coil is equipped with a core fixing holder that fixes the magnetic core and the winding frame.

That is, in the present invention, two windings are assembled into a winding frame in which a plurality of flanges are provided on the outer periphery of an insulating cylindrical winding core when the current directions flowing through the windings are opposite to each other. The magnetic core is wound so as to cancel out the magnetic flux induced in the core, and the inner leg of the split magnetic core is passed through the center hole of the core to form a closed magnetic path, and the outer periphery of the split magnetic core is fixed to the core. In a common mode tie-yoke coil that is assembled and fixed by a holder, a separate magnetic core made of resin and having elasticity is attached to the winding frame. Core holding protrusions cut out on three sides of the bottom to press the back side of the magnetic core, side walls that hold the sides of the separable magnetic core on both sides of the U-shape, and a winding frame attached to both walls of the open end of the U-shape. This is a common mode chain yoke coil characterized by comprising a core fixing holder provided with a mating protrusion that locks into a mating notch provided in the core.

FIG. 1 shows an embodiment of the common mode choke coil of the present invention.

The winding frame 1 has flanges 11a, 11b, and 11c outwardly provided at both ends and the middle part of the cylindrical winding core 10, forming two divided sections for winding a coil, and flanges 11a, 11c.
A base 13 is integrally provided at the bottom of the base 13, and a pin terminal 2 is embedded in the base 13. Center Tsuba 1
1b is a partition plate that insulates the two windings N1 and N2. The two windings N1 and N2 are wound in a balanced manner so that when currents in opposite directions flow through the respective windings, the magnetic fluxes inside the magnetic core cancel each other out.

As shown in FIG. 1, one of the split magnetic cores 3 is passed through the center hole of the cylindrical winding core 10 and fixed with a core fixing holder 4.

FIG. 2 shows an embodiment of a core fixing holder for a common mode York coil according to the present invention.

The core fixing holder is U-shaped with one side open, and it is necessary to press the outer periphery of the split magnetic core and press the core abutting surface of the split magnetic core.
A protrusion 41 is provided on both sides of the opening side of the U-shape at the center of the cutout on three sides of the bottom that presses the back of the split type magnetic core inside the U-shape, and side walls 42 for preventing the magnetic core from shifting are formed in the U-shape. A mating protrusion 43 is provided on both sides of the winding frame 1, and a mating protrusion 43 is provided at the end thereof.
It engages with the mating notch 12 provided perpendicularly to c, and the split magnetic core is butted against the winding frame, and the split magnetic core and winding frame can be connected even without varnish impregnation or adhesive treatment. The structure is such that the core fixing holders are fitted and fixed to each other.

Although not shown in the figure, even when the split magnetic core is placed horizontally, it is possible to obtain a coil with a similar structure with a lower product height by arranging the position of the mating notch on the flange of the winding frame in the horizontal direction. I can do it.

As described above, the core pressing protrusion according to the present invention is made of resin and has an elastic U-shaped inner side that presses the back surface of the magnetic core with notches on three sides, side walls 42 on both sides, and a mating protrusion. The common mode chiyoke coil uses a resin core fixing holder with
It is possible to reduce the number of assembly steps, eliminate adhesive fixation between the magnetic core and the core fixing holder, and remove varnish impregnation, thereby making it possible to obtain a common mode chiyoke coil that can be manufactured at low cost.

[Brief explanation of drawings]

Figure 1 is an assembly diagram of a common mode chiyoke coil equipped with a resin core fixing holder of the present invention.
FIG. 1a is a partially sectional front view, and FIG. 1b is a side view.
Figure 2 is a diagram showing a resin core fixing holder.
FIG. 2a is a partially sectional front view, and FIG. 2b is a side view.
FIG. 3, circuit configuration diagram. DESCRIPTION OF SYMBOLS 1... Winding frame, 2... Pin terminal, 3... Divided magnetic core, 4... Core fixing holder, 10... Cylindrical winding core, 11a, 11b, 11c... Tsuba, 12... Connection cut Notch, 13...Base, 41...Core holding projection, 42...Side wall, 43...Mating projection, 4
4...Notch.

Claims (1)

[Scope of utility model registration request] Two windings are applied to a winding frame with multiple flanges around the outer periphery of an insulating cylindrical winding core. When the directions of current flowing through the windings are opposite to each other, current is induced in a magnetic core built into the winding frame. The inner leg of the split type magnetic core is wound so as to cancel out the magnetic flux, and a closed magnetic path is formed by passing the inner leg of the split type magnetic core through the center hole of the core, and the outer periphery of the split type magnetic core is assembled and fixed to the core using a core fixing holder. In the common mode tie-yoke coil made of resin, the three bottom sides are placed inside both open ends of a U-shape that locks the split-type magnetic core to the winding frame. A core holding protrusion that presses the back of the notched split magnetic core, side walls that hold the sides of the split magnetic core on both sides of the U-shape, and a winding frame attached to both walls of the open end of the U-shape. A common mode chain yoke coil comprising a core fixing holder provided with a mating protrusion that locks into a mating notch.