JPS60206121A - Electromagnetic device - Google Patents

Abstract

PURPOSE:To obtain the electromagnetic device of simple constitution with which inductance or output can be changed as well reducing heating power by a method wherein a split-core part with which main magnetic flux will be branched off is provided at a part of the core which forms a main magnetic circuit, and two control windings are provided on said split core part, thereby enabling to control the main magnetic flux. CONSTITUTION:Pertaining to the assembling of the titled device, a main winding 2 is wound around an E-type core 11, the split core part 3 whereon control windings 41 and 42 are wound around is arranged on the center leg end part of the E-type core 11, and after an I-type core 12 has been opposed to the side leg of the E-type core 11 and the split core part 3, the core 11 is fixed. Then, with regard to the electric characteristics of the device, magnetic flux A is generated when a DC current is applied to the control windings 41 and 42 from a DC power source 5, no main magnetic flux runs (or reduced) on the main winding 2 when the split core part 3 is magnetically saturated by the magnetic flux A, and the value of inductance can be changed. When no DC current is supplied from the power source 5, the main magnetic flux by the main winding 2 is branched off and interlinked as in B and C on the control windings 41 and 42. A voltage is induced on the control windings 41 and 42, but the windings have the polarity with is cancelled each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic device that allows external control of magnetic flux flowing through a main magnetic path.

BACKGROUND ART Conventionally, in electromagnetic devices such as transformers and choke coils, only devices using saturable O-shaped cores have been proposed for changing the magnetic flux flowing through the cores forming the main magnetic path. However, since this method saturates the entire core, it generates a large amount of heat.

The present invention has been made in order to eliminate such drawbacks of conventional devices, and aims to provide an electromagnetic device that can change the magnetic flux without saturating the entire core forming the main magnetic path and generates less heat. Decide on what you are aiming for.

The present invention provides a split core part that is divided into two so that the magnetic flux is divided into a part of the core that forms the main magnetic path, and two control windings that are connected in series to each leg of this split core part. Each of the wires is fully wound, and a closed magnetic path is formed in the divided core portion through which direct current flows through these control windings.

The present invention can be applied to transformers and choke coils, and the core forming the main magnetic path may be one formed by butting a pair of E-shaped cores, one formed by butting a pair of U-shaped cores,
Any type of material may be used, such as a combination of I-type cocoa and a pot-shaped core.

Furthermore, the split core portion may be integrated with the core, or may be a separate core.

In the case of using separate cores, if one made by butting a pair of U-shaped cores is used, the shape itself is simple, and the winding is relatively easy.

Further, the amount of direct current supplied to the control winding may be such that it can saturate the divided core portion, but it is not necessarily necessary to saturate it.

The basic configuration of the present invention will be explained below with reference to FIGS. 1 and 2. (1) is a core that forms the main peak path and is composed of an E-shaped core circle and a ■-shaped core θ. (2) is the core (1
) This is the main winding with K winding. (3) is a divided core part, which is provided as a part of the core (1) and is divided into Vrc2 so that the magnetic flux from the main winding (2) is divided. In the case of FIG. 1, it is provided at the end of the central leg of the E-shaped core 01). In addition, in FIG. 1, the split core portion (3) is made from a core that is a separate member from the core (1).

For example, a pair of U-shaped cores G1).

It is made by matching 021. (4υ, (4z are the first and second control windings, and these control windings (4υ, (
42) are connected in series and are wound around each leg of the split core part (3) in such a manner that the split core part forms a closed magnetic path. (5) is a DC' power supply, and the control winding (4υ,
(4 types) [Items that supply continuous or intermittent direct current. Figure 1 shows the case of a choke coil. Forming an appropriate gap between the joint portions Vc is a matter of necessity.

Next, we will discuss the effect. First, regarding assembly, the main winding (
2) is wound around the E-type core aυ, and the control winding (4 superior, (42
The fully wound split core part (3) is arranged at the center leg end of the E-shaped core (1]), and the tcI-shaped core a is connected to the E-shaped core a.
After facing the side legs of υ and the split core part (3), they are fixed by known fixing means. Next, in terms of temperament, the control winding (4υ, 1
If DC' is supplied to 42, Figure 2+a
As shown in ), magnetic flux (AJ) is generated in the split core part (3), and when the split core part (3) becomes magnetically saturated due to this flux, the main magnetic flux due to the main winding (2) does not flow ( ), and the inductance value can be changed.When no DC current is supplied from the DC power supply (5), each control winding 0υ, (
The main magnetic flux due to the main winding (2) is (B), (C
) to branch off and become a chain father. Voltages with the polarities shown are induced in each control winding (4υ, +2+lK), but since these polarities cancel each other out, there is no voltage between the terminals of the control winding (4υ and +4Z). will not occur.

Next, the case of constructing a transformer will be described with reference to FIG. The core (6) is formed by abutting a pair of E-shaped cores 6υ with a gap (7) interposed therebetween. The main winding (8) consists of the negative winding υ and the secondary winding (c), and the split core part (9) has an E-shaped core +62 on the secondary winding width 4 side.
provided at the end of the central leg. Part of this split core (
9) can be formed in the same way as in the case of FIG. Further, the control windings (10) and (11) and the DC power supply Q2+ can also be constructed in the same manner as shown in FIG.

In Figure 2, from the DC' power source to the control winding QOI,
(11) When DC current is supplied to the divided core part (91K closed magnetic circuit is formed, the connection between the three missing windings and the secondary winding g is weak), and the output as a transformer. When no direct current is supplied, no voltage is generated between the terminals of the control winding ant and Elυ, as shown in FIG.

Next, the use of the present invention will be explained with reference to FIG. This example is applied to a choke coil inserted in the filament preheating circuit iI6 of a discharge lamp. That is, (100) is a hot cathode type discharge lamp, (101) is a high frequency generator such as a transistor inverter, (102) is an output transformer, and (104) is an AC' power supply.

(1 (15) is a choke coil with mll written as electric light 100
) is provided between the non-power supply side electrodes. This choke coil (105) includes a core (106), a main winding (107),
Split core part (108'), control winding (109), (11
0).

(111) is a DC' power supply, and in this example, the bias winding (111) provided in the output transformer (102) is
12), a rectifier (113) that rectifies and smoothes the output of this bias winding (112), a smoothing capacitor (114)
, a switch (115) that controls direct current supply to the control windings (109) and (110), and a current-limiting resistor (1
16). Note that the switch (
115) is a timer that responds to the start of the discharge lamp (100), such as turning on the AC power supply (104), and the discharge lamp (100).
A controller (117) consisting of a lamp, a torrent flow tester, etc.
It is turned on by K.

Next, we will discuss the effect. When starting the discharge lamp (100), the switch (115) is turned on and the control winding (109) is turned on.

(110) VC is supplied with direct current. therefore,
The impedance of the choke coil (105) decreases,
The filament of the discharge lamp (100) is preheated by providing sufficient current. The discharge lamp (1
00) lights up, the switch (115) is turned off and no direct current is supplied to the control windings (109) and (110). Therefore, the choke coil (105) comes to exhibit a predetermined impedance. Other functions are easily understood from the figures, so their explanation will be omitted.

FIG. 5 shows another example of use, in which it is applied to a choke coil for stabilizing the output of a DC power supply. That is, (200) is an AC power supply, (201) is a converter such as an inverter, (202) is an output transformer, (203), (
204) is a rectifier, (205) is a smoothing capacitor, (2
06) is a choke coil provided between the intermediate tap of the output winding of the output transformer (202) and the negative terminal of the smoothing capacitor (205). (207) is a comparator which outputs a full signal to reduce the difference in accordance with the difference between the output of the smoothing capacitor (205) and the reference pressure. (208) is controlled by the output signal of the comparator (207) to control the choke coil (206).
111541 Winding heave (209) This is a switch that supplies DC current to the winding (210). In this example, the switch (208) switches between the DC currents i and 1, depending on the output of the comparison device (207). Since a is used as a controller, the choke coil (2
06) is changed, resulting in the output '
This is important because it stabilizes the pressure. Other configurations and functions can be easily understood from the drawings, so their explanations will be omitted.

It should be noted that the present invention is not limited to the above-mentioned shape, and may be formed into various rhombus shapes. For example, the split core portion may be integrated with the core that forms the main magnetic path. Reed, 2 fU
In short, the ll ll 111 windings only need to be a pair, and may be divided into two or more. Further, it is preferable that the divided core portions occupy as little space as possible in the entire core, but it can be kept within an allowable range such as the amount of heat generated. Furthermore, there are various uses of the present invention, and it is applicable to purposes other than those described above.

For example, the structure shown in FIGS. 4 and 5 may be applied to the output truss 7.

As described in detail above, the present invention provides a divided core section that divides the main magnetic flux in a part of the core forming the main magnetic path, and provides two control windings in this divided core section to divert the main magnetic flux. Since it is controlled, it is possible to provide a magnetizing device that has a simple structure, reduces the generated Mt, and can change the inductance or the entire output.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the basic configuration of the present invention, Fig. 2 is a circuit diagram showing the main parts in Fig. 1, Fig. 3 is a plan view showing an embodiment of the invention, Figs. FIG. 5 is a circuit diagram showing an example of use of the present invention. (1), (6), (106)...Core, (2+
, [81, (107)...Main winding, (3) , t
91, (108) ... divided core part, (41),
(42, fIg+. α1) , (109), (110), (209), (
210)...Control winding, (5). (111)...DC power supply. Prologue to the drawings - (no change in content) Ax figure Body 2 figure figure 3 figure spine 4 figure 4-6 Closed Patent Application No. 62313 of 1982 2, title of invention electromagnetic device 3, case with person making amendment Related Patent Applicant: 1-4-28 Mita, Minato-ku, Tokyo 9i (375) Toshiba Electric Materials Co., Ltd. Representative: Dairoku Sato 4, Agent Address: 210 Saiwai-ku, Kawasaki City, Kanagawa Prefecture 72 Horikawa-cho, Toshiba Electric Materials Corporation, Horiyo-cho Office 5, Application subject to amendment, specification and drawings 6, Contents of amendment

Claims (1)

[Claims] (1) A core forming a main magnetic path, a main winding wound around this core, and a part of the core provided with a VC so that the magnetic flux from the main winding is divided into two parts. two control windings which are connected in series with each other and are wound around each leg of the split core so that the split core parts form a closed magnetic path, and these control windings. A 'bore grinding device' characterized by being fully equipped with a DC power supply that supplies DC current. (2J @g Picore is formed by butting a pair of E-shaped cores, and the split core portion is provided at the end of the central leg of either one of the E-shaped cores. Claim (1) A ruby-mounted electromagnetic device. (3) Claim (1) characterized in that the core forms a main magnetic path with a gap interposed therebetween. The electromagnetic device according to (2). (4) Claims (1) to (3) characterized in that the DC power source supplies the entire DC current intermittently.
) The electromagnetic device according to any one of