JPH0466367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to voltage regulators, and more particularly to voltage regulating transformers suitable for power regulation, anti-flicker or line voltage regulation.

〔Technical field〕

Ferro-resonant voltage regulators have been proposed in the past, but these voltage regulators were limited to those with a rated capacity of 5KVA or less. Moreover, there is a drawback that the output voltage of the voltage regulator is easily influenced by the frequency of the input voltage. Furthermore, it is not possible to accurately adjust the output voltage in response to changes in load impedance. Furthermore, a method has been proposed in which the voltage is adjusted by a static power regulator using a saturable reactor such as a semiconductor device or a magnetic amplifier. Although these regulators have the advantage of quick response, their size and weight significantly increase in proportion to the increase in rated capacity, and they are expensive. Moreover, the large waveform distortion of the output voltage required a bulky and expensive external filter.

[Purpose of the invention]

An object of the present invention is to provide a small and lightweight voltage regulating transformer with quick response and good output waveform.

Another object of the present invention is to provide a voltage regulating transformer that is easy to manufacture and assemble, is thin and inexpensive.

[Structure of the invention]

The voltage regulating transformer of the present invention includes a main magnetic flux loop path, at least one magnetic shunt having an air gap for bypassing a portion of the loop path, and first and second magnetic flux paths separated by the magnetic shunt. an iron core having a core portion, and an iron core wound around the first core portion;
The magnetic flux generated by the primary winding is changed by changing the magnetic saturation state of the secondary winding, the secondary winding wound around the second core part, and at least a part of the second core part. a control winding that adjusts the output voltage of the secondary winding by shunting from the main magnetic flux loop path to the magnetic shunt path, the first volume iron core having a center leg and an outer leg; and a second-volume core disposed on the center leg so as to surround the secondary winding and the control winding, and a third core with the center leg extending outward from the first-volume core. It is characterized in that it includes a core part, and the control winding is wound around the third core part.

〔Example〕

A preferred embodiment of a voltage regulating transformer according to the present invention will be described with reference to FIGS. 1-4.

1 to 3, the voltage regulating transformer 10 has a first core portion 12a and a second core portion 12a forming a main magnetic flux loop path.
The first volume iron core 12 is provided with a core portion 12b and a magnetic shunt 14 for bypassing a portion of the main magnetic flux loop path. First core part 1 of first volume iron core 12
A primary winding 16 is wound on the second core part 2a, and a secondary winding 20 is wound on the second core part 12b. Second
A second core 22 acting as a saturable core and a control winding 24 are provided to control the magnetic flux density of the magnetic shunt 14 by changing the magnetic saturation state of at least a portion of the core portion 12b. There is.

1 and 2, the first volume core 12 includes a center leg 26 and outer legs 28, 30 that constitute a main magnetic flux loop path. Center leg 26 includes a first core portion 12a and a second core portion 12b separated by magnetic shunt 14. The center legs 26 are disposed on the first core 12 and fixed to each other by fixtures 32 and 34 so as to be integrated. As is clear from FIGS. 1 and 4, the magnetic shunt 14 is composed of an iron core having a C-shaped cross section and made by laminating a large number of silicon steel plates. Groove 14a of magnetic shunt 14 is positioned to magnetically couple with center leg 26. Ends 14b, 14c of magnetic shunt 14
are placed on the outer legs 28, 30 of the first core 12, sandwiching inserts 36, 38 of a required thickness corresponding to a certain air gap, and the fixtures 4
0 and 42 to the outer legs 28 and 30, each core is integrated. magnetic shunt 1
4 shunts a portion of the magnetic flux of the main magnetic flux loop path to the outer legs 28 and 30 via a high reluctance gap (formed by interlayers 36 and 38) to adjust the output voltage as described below. At the same time, it functions to attenuate harmonics and reduce waveform distortion of the output voltage. The second volume core 22 is disposed on the underside of the magnetic shunt 14 over the center leg 26 and is magnetically coupled to the fixture 44,
46, each core is integrated. Primary winding 1
6. The secondary winding 20 as well as the control winding 24 are wound on the center leg 26 and are arranged substantially in the same plane. Furthermore, the top and bottom surfaces of each winding are
They are arranged so as to be aligned with the upper surface of the wound core 22 and the lower surface of the first wound core 12, respectively. That is, 1
The coil block of the secondary winding 16, the coil block of the secondary winding 20, and the coil block of the control winding 24 are arranged approximately within the thickness of the center leg 26 and the first and second winding cores 12, 22. be done. The third core portion 12C of the center leg 26 extends below the outside of the first core 12, and the third core portion 24 is wound on the lower end portion 12c of the center leg 26. The upper half of the second core 22 is arranged on the center leg 26 so as to overlap the first core 12, and the coil block of the secondary winding 20 and the coil block of the control winding 24 are Wound core 2
Surrounded by 2. In Figures 2 and 3, the second
The upper and lower parts of the wound core 22 are respectively fixed with fixtures 44,
46 constitutes an auxiliary magnetic flux loop path together with the center leg 26, and functions as a path for the magnetic flux of the control winding 24 when the control winding 24 is supplied with a DC control current. That is, the magnetic flux of the control coil 24 partially magnetically saturates the second core portion 12b of the center leg 26, thereby transferring the magnetic flux of the primary winding 16 from the main magnetic flux loop to the outer leg via the magnetic shunt 14. Shift to 28, 30.

1 and 2, when no DC control current is supplied to the control winding 24, the magnetic flux generated by the primary winding 16 passes from the center leg 26 to the outer legs 28, 30, Circulate to 26. At this time, the magnetic flux generated by the primary winding 16 interlinks with the secondary winding 20 to generate an induced voltage.

Next, connect the control winding 24 to a DC power source (not shown).
to the center via the second volume iron core 22.
When the second and third core portions 12b and 12c of the leg 26 are magnetically saturated, the magnetic flux generated by the primary winding 16 is shifted to the magnetic shunt 14. At this time, the magnetic flux is distributed between the first core part 12a, the outer legs 28 and 30
and circulates through the magnetic shunt 14 to the secondary winding 2
Since the magnetic flux interlinking with zero is reduced, the secondary winding 2
0 output voltage will be low. When the DC current supplied to the control winding 24 is reduced, the output voltage increases accordingly. In this way, by variably controlling the magnetic saturation states of the second and third core portions 12b and 12c of the center leg 26, the magnetic shunt 14
The magnetic flux of the primary winding 16 is controlled to be shifted to 2.
The output voltage of the next winding can be variably controlled.

〔Effect of the invention〕

As is clear from the above, the voltage regulating transformer according to the present invention provides the following effects.

In the voltage regulating transformer of the present invention, it is possible to employ a single control winding, and the main magnetic flux loop path and the auxiliary magnetic flux loop path are partially overlapped, and each winding core and each winding are arranged in the same plane. Second, the voltage regulator can be made ultra-thin and compact. Furthermore, since the center leg and each winding core are integrated with a fixture, manufacturing and assembly are extremely simple. Furthermore, since a magnetic shunt is provided in the main magnetic flux loop path via an air gap, harmonics are attenuated and waveform distortion of the output voltage is improved.

[Brief explanation of drawings]

1 is a plan view of a preferred embodiment of the voltage regulating transformer according to the present invention, FIG. 2 is a right side view of the voltage regulating transformer of FIG. 1, and FIG. 3 is a bottom view of the voltage regulating transformer of FIG. 1. , and 4 show cross-sectional views taken along the - line in FIG. 1, respectively. 12...First volume iron core, 16...Primary winding, 20
... Secondary winding, 22 ... Second volume iron core, 24 ... Control winding, 26 ... Center leg, 28, 30
...Outer Retsugu.

Claims (1)

[Claims] 1. At least one magnetic shunt provided with a main magnetic flux loop path and an air gap for bypassing a portion of this loop path, and first and second cores separated by this magnetic shunt. a primary winding wound around the first core part; a secondary winding wound around the second core part; and at least a part of the second core part. a control winding that adjusts the output voltage of the secondary winding by varying the magnetic saturation state and shunting the magnetic flux generated by the primary winding from the main flux loop path to the magnetic shunt path; The iron core includes a first-volume core having a center leg and an outer leg, and a second-volume core disposed on the center leg so as to surround the secondary winding and the control winding. . A voltage regulating transformer, wherein the center leg includes a third core portion extending outward from the first volume iron core, and the control winding is wound around the third core portion. 2. The iron core further comprises a first fixture for fixing the first volume core and the center leg, and a second fixture for fixing the second volume core and the center leg. A voltage regulating transformer according to claim 1. 3. On one side of the center leg, the first
3. The voltage regulating transformer according to claim 1, wherein a wound core is arranged, and the second wound core is arranged on the other side of the center leg. 4. The voltage power regulating transformer according to claim 3, wherein the primary winding, the secondary winding, and the control winding are arranged in substantially the same plane. 5. A patent characterized in that the second and third core portions of the center leg and the second volume iron core form an auxiliary magnetic flux loop path, and the auxiliary magnetic flux loop path is magnetically saturated by the control winding. A voltage regulating transformer according to claim 2 or 3. 6. A patent characterized in that the primary winding, the secondary winding, and the control winding are arranged approximately within the thickness of the center leg and the first and second cores. Claim 5: Voltage regulating transformer.