JPH0140181Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite tie-yoke coil that is suitable for application to an output filter tie-yoke coil used in switching power supplies, etc., and maintains a stable output regardless of the magnitude of the load current.

As shown in FIG. 1, for example, a conventional chain coil has a general structure in which a horizontal annular gap 3 is formed in upper and lower cores 1 and 2 made of a pot, and a wire-wound coil 4 is attached thereto. Therefore, the DC superimposition characteristic has a problem in that the inductance value becomes small in the small current value region, as shown by curve A in FIG.

However, an output filter yoke coil for a switching power supply or the like is required to have a higher inductance value for a small direct current, and to maintain a certain degree of inductance and not saturate for a large direct current.

In view of this point, the present invention has been developed to
A hole for inserting an adjustment core is provided in the middle leg of each magnetic core of type and EE type, and by inserting an adjustment core made of amorphous metal that can obtain the required inductance into this hole, it has nonlinear characteristics. The main purpose is to propose an octopus-type chiyoke coil.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a sectional view of a chiyoke coil showing an example of the present invention. Reference numerals 6 and 7 indicate upper and lower pot-shaped cores, a horizontal annular gap 8 is provided at the center of these cores, and a center hole 9 is bored through the center of the upper and lower cores. An adjustment core 10 molded from an amorphous metal is provided in the center hole 9 so as to be freely adjustable. The adjustable core 10 is made by winding an amorphous metal thin film 12 around a core 11 having a flat plate-shaped head and a male threaded lower part, and is screwed into a female threaded part 14 fixed to the lower surface of the lower core 7. . Note that 13 indicates a winding coil.

Curve B in FIG. 2 shows the DC superimposition characteristic of the present invention's chiyoke coil. As is clear from the figure, it is found that in the micro current region, an inductance value more than three times that of the conventional structure can be obtained. However, the unsaturated region is slightly reduced. Such causes are
This is thought to be due to the insertion of a saturable object into the magnetic circuit, which causes the rise of the magnetic flux density in the first quadrant to be steep, as shown by the solid line in the B-H curve diagram shown in FIG. Incidentally, dashed lines indicate changes due to the conventional structure.

Furthermore, since the adjustment center 10 has one or ten grooves 10a on its head, it is possible to shift the position of the amorphous metal 12 up and down by turning it with a screwdriver or the like. , it becomes possible to change the nonlinear characteristics from curve B to curve B'.

As described above, according to the present invention, a hole for inserting an adjustment core is provided in the middle leg of the magnetic core, and an adjustment core made of an amorphous metal is provided in the hole in a threaded manner with respect to the magnetic core. Since the adjustment core is configured to be movable with respect to the magnetic core, it is possible to make the output filter chiyoke coil nonlinear, and a composite chiyoke coil that maintains the output stably regardless of the magnitude of the load current can be obtained. Further, it has the advantage that the inductance can be arbitrarily varied by changing the positional relationship of the adjustment cores, which has the effect of greatly contributing to not only performance improvement but also cost reduction.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an example of a conventional Chi-Yoke coil, Figure 2 is a characteristic curve diagram showing the DC superposition characteristics of a conventional Chi-Yoke coil and a nonlinear composite Chi-Yoke coil according to the present invention, and Figure 3 is a nonlinear composite Chi-Yoke coil according to the present invention. FIG. 4 is a cross-sectional view showing an example of the present invention, and FIG. 4 is a B-H characteristic curve diagram of a conventional Chi-Yoke coil and a nonlinear composite Chi-Yoke coil according to the present invention. 6, 7... Ferrite pot-shaped core, 8... Gap, 9... Center hole, 10... Adjustment core molded from amorphous metal.

Claims (1)

[Scope of utility model registration request] A hole is provided in the middle leg of the magnetic core to insert the adjustment core,
A nonlinear composite chi-yoke coil in which an adjustment core made of amorphous metal is provided in the hole in a threaded manner with respect to the magnetic core, and the adjustment core is movable with respect to the magnetic core.