SU760346A1 - Thyristor-transformer regulator - Google Patents

Description

The invention relates to a converter technique and can be used in devices where it is necessary to regulate the value of a single-half-period-rectified voltage, in particular in devices for testing thyristors, triacs and diodes> in the conducting state. . "

Known circuit thyristor-transformer AC voltage regulators of discrete containing as regulator transformer with taps of the primary and secondary windings' to koto-, _ ring connected bipolar thyristor ¹ * · nye keys containing anti-parallel connected thyristors [ΐ ].

By switching the thyristor switches one achieves the necessary change in the transformation coefficient, and consequently, the voltage on the load.

The closest to the invention is essentially a technical solution is a device containing a transformer-25 torus with taps from the turns of the primary winding, two bipolar thyristor switches, and also a relay device with normally closed contacts connecting one thyristor switch

2

to the tap-off of the winding of the power transformer, and normally open contacts shunting the other thyristor key. The primary winding of an additional transformer with its shunt resistor is switched on to the power bus circuit at the input of the thyristor * stabilizer. The ends of the secondary winding of an additional transformer are connected via diodes to capacitors and inputs of a relay device [2-1 ·

The main disadvantages of such a device are:

when running it at halftime. the rectifier is too high; the number of thyristors is too high;

The use of bipolar thyristor keys for switching transformer taps creates opportunities for the occurrence of short circuits between taps of a transformer winding through the thyristors of the keys. It is impossible to avoid such closures without priming.

The aim of the invention is to reduce the number of necessary thyristors when the regulator is operated on a half-wave rectifier, and also to eliminate the possibility of the occurrence of short 3 760346

four

These are the short circuits between the transformer taps via the thyristors of the keys, i.e., an increase in the functional reliability of the controller.

P PostavlNaya goal is achieved by the fact that the rubric-transformer monitor, a transformer, containing a transformer, taps and one end of which through which controlled keys

"connected to one input power" "vom'u regulator output, and" the second input. _

This power output is formed by the other ' ^and • end of this winding, and at least one controlled key is made with two-way conductivity,

y '~ output pins of the regulator are connected to the ends of the secondary winding of the trans-15 formator through a rectifier, all the “^' ~ ра ¹ operating keys, except the key connected to the tap from the minimum

----- the number of turns of the primary winding, are made with one-sided conductivity. - 20

The drawing shows an electrical thyristor transformer ——————------ Ibgb voltage regulator with discrete:

, „- ny - by switching the turns on the primary side of the transformer operating on ... 25

...... On a single-half rectifier.

The circuit contains a transformer 1c

taps from the turns of the primary winding of the regulating thyristors

2, control unit 3, one-halfd ^ one rectifier on diode 4 and load ’5. ....., .........

The device works as follows.

From the control unit 3, a control pulse is supplied to the key thyristor, 35

“two double counter-parallel” of the connected thyristors, conductor current through the winding of the transformer 1 in the “ ⁴ directions” opposite to all other thyristors of group 2. When 40 is applied to a voltage of the corresponding polarity to this thyristor

'Opens, and the half-wave voltage of the network magnetizes the transformer 1 strings. On the secondary side of the transformer 1, a half-wave voltage is applied to the diode 4 in the opposite direction and does not pass to the load 5,'

mains voltage from control unit 3

'On one of the thyristors of the regulatory group 2, opening it. The mains half-voltage is applied to the primary winding of transformer 1 now in the opposite direction, 55 demagnetizing the transformer core 1. At the same time, the thyristor operating in the previous / half-period is applied voltage in the opposite direction, locking it and then

“Translating the possibility of short-circuiting the transformer winding section. '· /

On the secondary side, a half-wave voltage through diode 4 is applied to the load. The amplitude of this voltage is changed by switching taps of the primary winding of the transformer 1 using the thyristors of the control group 2. The duty cycle of the voltage pulses on the load 5 can be changed using the control unit 3. The number and step of taps from the turns of the transformer winding are selected on the basis of the necessary law and the smoothness of voltage regulation on the load. ^one

Thus, the ^ described circuit completely eliminates the possibility of short-circuiting the transformer winding sections through the thyristors of the keys. This eliminates the need for special device protection measures. In addition, by reducing the installed number of thyristors, the control circuit of the controller is greatly simplified and the reliability of the device as a whole increases.

Claims (1)

Claim Thyristor-transformer regulator containing a transformer, taps and one 'end of the primary winding of which through controlled keys are connected to one input power output of the regulator, and the second input power output is formed by the other end of this winding, at least one controlled key made with two-way conductivity, and the output of the regulator is connected to the ends of the secondary winding through a rectifier through which I, in order to simplify and increase the functional reliability with Performing the said half-wave rectifier, all controlled keys, except the key / connected to the tap from the minimum number of turns of the primary winding, are made with one-sided conductivity.