CN1078716C

CN1078716C - Simple and reliable compensation voltage regulator

Info

Publication number: CN1078716C
Application number: CN 97115702
Authority: CN
Inventors: 陈建
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-08-03
Filing date: 1997-08-03
Publication date: 2002-01-30
Anticipated expiration: 2017-08-03
Also published as: CN1188921A

Abstract

The present invention belongs to a compensating voltage stabilizer for electrical products. The present invention is characterized in that the present invention is provided with two transformer type saturated reactors which have the same structure; when output voltage deviates from a voltage-stabilizing value, the deviation is amplified to make one transformer type saturated reactor run in a saturated reactor state, and the other transformer type saturated reactor runs still in a transformer state; therefore, the inductive reactance of AC primary windings of the two transformer type saturated reactors is different, the voltage drop of the two transformer type saturated reactors is different, the AC secondary windings which are connected in series in opposite polarity of the two transformer type saturated reactors output a voltage difference with polarity to a compensating transformer to perform the action of compensation so that output voltage is kept to be the voltage-stabilizing value. The present invention has the characteristics of simpleness, high reliability, easy maintenance, low cost, short straining time, long service life, etc.

Description

A kind of compensated voltage regulator

The present invention relates to the voltage stabilizer (stabilized voltage supply) in the electric product, especially powerful compensated voltage regulator.

At present, known voltage stabilizer kind is a lot, and powerful most employings are compensation.Wherein better simply a kind of principle of work is compensation transformer of series connection in major loop.When output voltage departs from the voltage stabilizing value, utilize the deviation of negative feedback voltage and given voltage, remove to drive servomotor after the amplification, drive the carbon brush on the contact type voltage regulator, adjust the bucking voltage on the compensation transformer, output voltage is returned in the accuracy rating of ratings.

Damage easily though this scheme simply, has rotating part and carbon brush etc., difficult in maintenance, cost height and strain time are than shortcomings such as length.

The purpose of this invention is to provide a kind of not only simply but also reliably compensated voltage regulator to overcome above-mentioned shortcoming.

The present invention structurally adopts 2 transformer type saturable reactors (or claiming the magnetic saturation type transformer) to replace servomotor and the contact type voltage regulator in the such scheme.Fig. 1 is a kind of of single transformer formula saturable reactor planimetric map, it is characterized in that its iron core and general single-phase saturable reactor iron core are similar; Basic winding then has three groups: dc magnetizing winding Wk, exchange one time winding W1, and exchange Secondary Winding W2.

Should satisfy following requirement between its alternating current-direct current winding: 1. when in exchanging winding, flowing through exchange current, should in the direct current winding, not respond to the generation alternating electromotive force;

2. when the exciting curent in the change direct current, will change the degree of saturation (promptly changing the induction reactance that exchanges winding) of iron core.

Fig. 2 is 2 wiring diagrams between the single transformer formula saturable reactor.The major parameter of 2 transformer type saturable reactors (core dimensions, winding group number etc.) should be identical; Connect back and receive (can be connected on the front or the back of compensation transformer, be good with the front generally) on the major loop of its winding of interchange (W1a and W1b) of two; Export to a winding of compensation transformer after its interchange Secondary Winding (W2a and W2b) of two series connection (both polarity is opposite); Its direct current winding (Wka and Wkb) of two is then independent separately.

Fig. 3 is a kind of in the single-phase electrical schematic diagram of the present invention.Tb is compensation transformer among the figure; Tga and Tgb are the transformer type saturable reactors; Bga and Bgb are triodes; Uf is a negative feedback voltage; U0 is given reference voltage; B1～B4 is a diode.

Principle of work of the present invention is summarized as follows:

1. when in the output voltage U 2 accuracy rating at ratings:

The dc magnetizing winding of two transformer type saturable reactors is serially connected with on the current collection level loop of triode Bga and Bgb.At this moment Uf=U0, the equal no-output of diode B1～B4 on the rectifier bridge, Bga and all not conductings of Bgb, therefore 2 transformer type saturable reactors all do not have dc magnetizing, all do the transformer state operation, and Tga is identical with Tgb induction reactance.U2 on average lands on their winding of interchange, i.e. Uw1a=Uw1b=U2/2; Their Secondary Winding voltage U w2a=Uw2b, but because reversed polarity series connection, so vector of Uw2a and Uw2b and be zero, make the winding of compensator transformer Tb because there is not voltage to import and not redeeming, U2 remains in the accuracy rating of voltage stabilizing value, because 2 transformer type saturable reactors are not necessarily identical on characteristic, Uw2a during above-mentioned situation and the vector of Uw2b and need not be equal to zero, at this moment can adjust the tap on the Uf potentiometer R, adjust feedback voltage Uf and adjust its zero point.(reason sees down two joints for details).

2. when power network fluctuation or load disturbance, when establishing U2 less than the voltage stabilizing value:

At this moment Uf＜U0, B1 on the rectifier bridge, the base current conducting of two diode current flows of B3 (all the other two diode B2, B4 ends) triode Bgb, make transformer type saturable reactor Tgb have the dc magnetizing electric current to flow through, do saturable reactor state operation (Tga still does the transformer state operation).The induction reactance that makes Tgb is less than Tga.

Therefore, U2 lands voltage on W1a greater than W1b, i.e. Uw1a＞Uw1b, it is the vector of Uw2a and Uw2b and greater than zero, its difference is exported to the winding of compensator transformer Tb, makes to produce bucking voltage Δ Ub, makes in the vector of U1 and Δ Ub and the accuracy rating that U2 is returned to ratings.

Because Tgb is when having dc magnetizing, Uw1a＞Uw1b, therefore abundant when saturated as Tgb, U2 almost all falls on the W1a of Tga, so the ratings of the elementary winding W1a of transformer type saturable reactor need design (for example single-phase is 220 volts) by the U2 ratings.

3. otherwise, as U2 during greater than stationary value:

Uf＞U0 at this time, B2 on the rectifier bridge, two diode current flow (B1 of B4, B3 ends), triode Bga conducting makes transformer type saturable reactor Tba have the dc magnetizing electric current to pass through, do saturable reactor state operation (Tgb still does the transformer state operation), the induction reactance that makes Tga is less than Tgb.Therefore, U2 lands voltage on W1b greater than W1a, be Uw1b＞Uw1a, it is the vector of Uw2b and Uw2a and greater than zero, its difference is exported to a winding of compensation transformer, make to produce reciprocal bucking voltage Δ Ub (because of W2b connects with the W2a reversed polarity), U2 is returned in the accuracy rating of ratings.

Just the rated voltage of utmost point winding W1b also must be by U2 ratings design (for example single-phase is 220 volts) for the same reason, transformer type saturable reactor.

This its load characteristic of regulating device and the contact type voltage regulator that is composed in series by 2 transformer type saturable reactors is similar, be inductive load, so it is also similar to the influence of U2 waveform and phase place.

Be to adopt simply to have difference to regulate automatic control circuit among Fig. 3, also can adopt indifference circuit or system controlled by computer as required.

Reference voltage U0 among Fig. 3 can adopt integrated circuit composition or other stabilized voltage supply.

Preposition amplification among Fig. 3 is still available other amplifiers except that triode.

Transformer type saturable reactor Tga is the electrical communication structure with the secondary windings in series that exchanges of Tgb among Fig. 3, also can use the magnetic association structure of above-mentioned two windings instead, but must keep both opposite these characteristics of polarity.

For three-phase system, can combine by three tool monophase systems.Also can be made up of a tool three-phase transformer formula saturable reactor, its design feature also is that each increases by one group of interchange Secondary Winding mutually on three-phase saturation electric reactor.

The present invention can add overvoltage, overload, protective devices such as the phase failure.

Because adopt such scheme, the present invention has following advantage:

(1) can replace servomotor and contact type voltage regulator etc. with 2 transformer type saturable reactors and rotate easily worn part;

(2) system architecture is simple, and reliable, not fragile, easy to maintenance, volume is little, and is with low cost;

(3) efficient of system, waveform distortion, the precision of voltage regulations etc. are more or less the same with prior art, but noise is little, and the life-span is long, and the strain time is short.Therefore, the present invention has social benefit and economic benefit.

Claims

1. the present invention is a kind of compensated voltage regulator, it rotates the rapid wear device with servomotor in 2 transformer type saturable reactors replacement prior arts and contact type voltage regulator etc., it is characterized in that 2 transformer type saturable reactor structures are identical, three basic windings are respectively arranged: the dc magnetizing winding exchanges winding and exchanges Secondary Winding; Be connected on the major loop after winding non-same polarity of its 2 interchanges is in series, exchange a winding exporting to compensator transformer after Secondary Winding end of the same name is connected, its dc magnetizing winding is then independent separately.