JPS5846953B2 - Seiriyuusouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rectifier having a configuration in which rectifying elements are connected in parallel to obtain a DC output.

If it is impossible to obtain the required DC output with one rectifying element, the rectifying elements are generally connected in parallel.

1 and 2 show a conventional rectifier for obtaining a low voltage, high current DC output.

When obtaining low voltage and large current, the transformer is normally configured as an outer iron type as shown in Fig. 1, and the primary winding 3 is connected to the inner shell 2 of the iron core 1.
and a secondary winding 4, and a rectifying element is connected to the secondary winding 4.

The electrical connection is as shown in FIG. 2, and the secondary winding 4 is divided into two or more windings, including windings 4a and 4b, as shown in the drawing.

In FIG. 2, the windings 4a and 4b have a center tap configuration, respectively, and diodes 5a and 5b.

5c and 5d are connected.

With this configuration, the alternating current supplied to the input terminal 6 is transformed into a low voltage, then rectified by the diodes 5a to 5d, and a direct current output is obtained from the output terminals 7a and 7b.

In this circuit, the voltage drop across the diodes 5a to 5d,
If the wiring impedances and the like are equal, the current values of the diodes 5a and 5c and 5b and 5d that are conductive at the same time will be equal.

However, in general, there are variations in the voltage drop of the diode, the impedance of the wiring, etc., making it difficult to balance the current.

An object of the present invention is to provide a rectifier that can easily balance current.

In order to achieve the above object, the present invention is arranged so that a common inner leg portion consisting of a central inner body of a multi-legged core or a centrally disposed portion when a plurality of two-legged cores are combined is formed. n magnetic circuits (where n is an integer) and transformer primary windings wound around the inner leg, each having the same number of turns, wound around the inner leg, and connected in parallel to each other. n transformer secondary windings, and n rectifying elements each connected in series to the n secondary windings so as to obtain DC output in the same direction from the n secondary windings. and, furthermore, the n number of 2
The secondary windings are each wound to have a fractional number of turns of 1/n, and the n secondary windings are wound such that one fractional winding portion corresponds to one magnetic circuit. The present invention relates to a rectifying device characterized in that the rectifying device is arranged in each case.

With the configuration as described above, the currents flowing through the respective windings and the rectifying element become approximately equal due to the effect of the fractional number of windings.

Also, it becomes possible to obtain a voltage corresponding to a fractional number of windings.

Next, embodiments of the present invention will be described based on the drawings.

3 and 4 show a low voltage, high current rectifier according to the present invention.

In this drawing, parts common to FIGS. 1 and 2 are given the same reference numerals.

In this transformer as well, primary windings 3 and 2 are connected to the inner shell 2 of the iron core 1.
The next winding 4 is wound respectively.

The secondary winding 4 is divided into two windings 4 a t 4 b corresponding to the two outer legs 11 , 12 .

Since it is a center tap type full wave rectifier circuit as shown in FIG. 2, the output terminal 7a is connected to the center tap of the winding 4a.
The winding 4a is divided into windings 13 and 14.

Further, the winding 4b is also divided into windings 15 and 16.

Diodes 5a, 5b, 5c, and 5ct are connected between the respective windings 13, 14, 15, and 16 and the output terminal 7b, respectively.

In the present invention, the windings 13, 14, 15, and 16 are not simply wound around the inner shell 2, but are wound under specified conditions.

In this rectifier, diodes 5a and 50 are conductive at the same time, and when diodes 5a and 5c are off, diodes 5b and 5d are conductive at the same time.
Observing the windings 13 and 15 connected to a and 5c, the husband's winding 13.15 is wound 1.5 times.

The winding 13 interlinks twice with the magnetic flux φ1 of the magnetic circuit formed by the left outer leg 11, and once with the magnetic flux φ2 of the magnetic circuit formed by the right outer leg 12.

On the other hand, the winding 15 interlinks with the magnetic flux φ1 of the magnetic circuit formed by the left outer leg 11 once, and twice with the magnetic flux φ2 of the magnetic circuit formed by the right outer leg 12.

Therefore, if the windings 13 and 15 are totaled, the magnetic fluxes φ1 and φ
It is interlinked with 2 and 3 times each.

Now, I considered the magnetic circuit separately for φ1 and φ2, but φ1+φ
Considering the magnetic circuit of 2, the windings 13 and 15 are 1.
They are chained five times each.

Windings 14° and 16 are also wound in a similar manner.

The cross-sectional areas of the left and right outer legs 11 and 12 are equal as shown in FIG. 4, and are equal to the cross-sectional area of the inner trunk 2.

Therefore, when currents of the same value flow through the windings 13 and 15 or 14 and 16, the magnetic resistances of the left and right outer legs 17 and 18 are equal.

Next, the windings 13 and 15 and the magnetic flux φ1. The relationship with φ2 will be explained in more detail.

First, as is clear from FIGS. 3 and 4, the winding 13 starts from the terminal 7a, passes between the left outer leg 11 and the inner body 2, interlinks with the magnetic flux φ1, and then, It passes between the right outer leg 12 and the inner body 2, interlinks with the magnetic flux φ2, passes again between the left outer leg 11 and the inner body 2, interlinks with the magnetic flux φ1, and then connects to the diode 5a. reach.

Therefore, the total flux linkage of the winding 13 can be expressed by the following equation.

On the other hand, the winding 15 starts from the terminal 7a and starts from the right outer leg 1.
2 and the inner body 2 and interlinks with the magnetic flux φ2, then passes between the left outer leg 11 and the inner body 2 and interlinks with the magnetic flux φ1,
It passes again between the right outer leg 12 and the inner body 2, interlinks with the magnetic flux φ2, and then reaches the diode 5c.

Therefore, the total flux linkage of the winding 15 can be expressed by the following equation.

By the way, since windings 13 and 15 are connected in parallel,
These voltages ■1. ■Since 2 are equal, the following formula must hold true.

In order for this equation (5) to hold true, φ1=φ2 must be satisfied.

Also, since φ1 and φ2 are determined by the current in the primary winding 3, if the current in the primary winding 3 is constant, φ1
+φ2 is also constant.

On the other hand, the current in the winding 13 is 11, and the current in the winding 15 is 12.1.
The current ip in the secondary winding 3, the number of turns in the primary winding 3 is NPs, and the magnetic flux φ
1, that is, the magnetic resistance of the left outer leg 11, and the magnetic circuit of magnetic flux φ2, that is, the magnetic resistance of the right outer leg 12, are respectively R.
Magnetic flux φ1. generated by the primary winding 3 in the left and right outer legs 11, 12. φ2 can be expressed by the following equation.

As explained in equation (5), it is necessary that φ1=φ2, so the following equation must be established based on equation (6×7).

In order for this equation (8) to hold true, 11 = 12 must be satisfied.

By the way, assuming that a load through which a constant current flows is connected to this rectifier circuit, and if the resistance value of the diode 5a decreases for some unknown reason, the current i flowing through the winding 13
1 increases, and the magnetic flux φ1 tends to decrease.

At this time, φ1+φ2 must be constant, so φ
The decrease of 1 must be compensated for by the increase of φ2.

In order to increase φ2, it is necessary to increase the current 12 in the winding 15, but since it is assumed that the load is a constant current circuit, it is impossible to increase both 11 and 12. .

In the end, even if the resistance value of the diode 5a decreases, the current i1
If the ratio between and 12 does not change and the magnetic resistances of the left magnetic leg 11 and the right magnetic leg 12 are equal, it is maintained at 11-12.

On the other hand, if the load is not a constant current load, the diode 5
If the current i1 in the winding 13 increases in response to the decrease in the resistance value of a, the magnetic flux φ1 decreases, and the current 12 in the winding 15 also increases in order to increase the magnetic flux φ2 so as to keep φ1+φ2 constant. .

That is, both currents i1 and 12 increase.

Therefore, no change occurs in the ratio between the currents 11 and i2, and the balance between the two is maintained.

FIG. 5 shows a second embodiment of the invention.

In this drawing, parts common to those in FIG. 3 are given the same reference numerals, and their explanation will be omitted.

The rectifier of this embodiment is a half-wave rectifier circuit.

Therefore, windings 14, 16 in FIG. 3 are not provided.

FIG. 6 shows a third embodiment of the present invention. Ru.

This transformer is constructed to obtain a voltage or current corresponding to one fractional winding.

21.degree. 22.23 are first, second and third iron cores of two-leg configuration, each having the same cross-sectional area, one leg 21a;

22a and 23a constitute an inner leg portion.

The secondary winding 24 includes a first winding 24a shown by a dotted line, a second winding 24b shown by a dashed line, and a third winding 24c shown by a solid line.
It is divided into two parts and connected in parallel.

Of these, the winding 24a is wound twice around the iron core 21, and once around the remaining iron cores 22 and 23, respectively.

Moreover, the winding 24b is wound twice around the iron core 22, and the remaining iron core 21
, 23 are each wound once.

Moreover, the winding 24c is wound twice around the iron core 23, and the remaining iron core 2
1.22 are wound once each.

The primary winding, which is not shown, has three iron cores 2L22,
23 have the same number of turns.

Further, diodes 27, 28, and 29 are connected in series to each winding.

By winding the secondary winding 24 as described above, it is possible to obtain a voltage at the output terminal 1 25, 26 that corresponds to one turn, that is, the number of turns that is the sum of one turn and Milo.

Further, even if the currents flowing through the diodes 27, 28, and 29 become unbalanced, the balanced state is restored by the same action as in the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and can be further modified.

For example, in the first embodiment, the secondary windings 13, 14,
By changing 15 and 16 to 2.5 times, 3.5 times, etc., it is possible to obtain an output corresponding to this.

Further, by providing n magnetic circuits and winding the n-divided secondary windings in fractional numbers, it is possible to obtain an output corresponding to the fractional windings from ± to n-1.

Further, although three two-legged cores are combined in FIG. 6, a four-legged center core may be used, and the winding wire may be wound around the inner shell of the core.

Alternatively, a transformer as shown in FIG. 3 may be constructed by combining two two-leg iron cores.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view showing a transformer used in a conventional rectifier, FIG. 2 is a circuit diagram of the rectifier, and FIG. 3 is an explanatory front view of a rectifier according to the first embodiment of the present invention. 4 is an explanatory cross-sectional view of FIG. 3, and FIGS. 5 and 6 are front views and cross-sectional views explanatory of rectifiers according to second and third embodiments of the present invention. It is. In addition, in the symbols used in the drawings, 1 is the iron core, 2 is the inner shell, 3 is the primary winding, 4a, 4b are the secondary windings, 5a, 5
b, 5c, 5ci are diodes, 11゜12 are outer legs, 1
3, 14, 15, and 16 are windings.

Claims (1)

[Claims] 1. n magnetic circuits (where n is an integer) arranged so that a common inner leg is formed, and a transformer primary winding wound around the inner leg are the same. n transformer secondary windings each having a number of turns wound around the inner leg and connected in parallel to each other, and DC output in the same direction from the n secondary windings. n rectifier elements each connected in series to the n secondary windings, and each of the n secondary windings is wound to have a number of turns that is a fraction of 1/n. A rectifying device characterized in that the n secondary windings are arranged such that one of the fractional winding portions corresponds to one of the magnetic circuits.