SU1293717A1 - Thyristor a.c.voltage stabilizer - Google Patents

Abstract

The invention relates to secondary power sources of radio equipment. The aim of the invention is to simplify the thyristor AC voltage regulator while reducing weight and volume and improving reliability. The goal is achieved by introducing a single junction transistor 8 into the circuit. When the power is supplied, the charging capacitor 13 is charged. Transistor 8 is closed. The thyristor 10 is also closed and the transformer 1 works as a step-down. When the transistor 8 is turned on, the capacitor 13 is discharged and the thyristor 10 is turned on, the winding 2 of transformer 1 and throttle 3 are shunt-connected. Transformer 1 works as above. The output voltage is controlled by changing the switching time of the switched winding 2 and throttles 3. 1 sludge. (Ls

Description

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The invention relates to electrical engineering, in particular, to the technique of stabilization and regulation of alternating current, and can be used in power supply devices of radio engineering equipment.

The purpose of the invention is to simplify while reducing the mass and volume and increasing the reliability of the alternating voltage thyristor stabilizer.

The drawing shows an electrical circuit of a thyristor variable voltage regulator.

The stabilizer contains a transformer 1 with a switched winding 2, a choke 3, a diode-thyristor switch 4 and a control unit consisting of an auxiliary winding 5 of transformer 1, a rectifier 6, a pulse-width modulator 7, assembled on a single junction transistor 8, connected to the first base through the limiting resistor 9 to the control electrode of the thyristor 10, the second base to the voltage divider On resistors 11 and 12, and the emitter to the common connection point of the time of the driving capacitor 13, resistor 14 and the collector of the control anzistora amplifier 15 DC. The opposite end of the time — the driving capacitor 13 is connected to the common connection point of the emitter of the control transistor 15, the cathode of the Zener diode 16, resistors 12 and 17, and the cathode of the thyristor 10 connected to the anodes of the diodes 18 and 19 of the diode-thyristor switch 4. The opposite the end of the resistor 14 is connected to the common point of connection of the anode of the diode 20, resistor 11 and the positive output of the rectifier 6. The cathode of the diode 20 is connected to the positive terminal of the filter capacitor 21 and the trimming resistor 22 connected to the other terminal of the transistor control torus 15 and resistor 23. The opposite end of resistor 23 is connected to the anode of the Zener diode 16 and the minus terminal of the rectifier 6.

The device works as follows.

When the supply voltage is applied to the winding of the transformer 1, we charge the driver capacitor 13 by a small voltage across the circuit, plus a voltage 6 5

one

0 5 o 5 0

five

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resistor 14 - capacitor 13 - zener diode 16 - minus rectifier 6. The single-transistor 8 is closed by biasing on the second base created by the voltage divider on resistors 11 and 12. The control current is not supplied to the control electrode of the thyristor 10, as a result it is closed and transformer 1 works as a pon -1zhayuschy. As the charge time of the capacitor 13 increases, the positive potential at the emitter of transistor 8 increases, as a result of which it opens and the time of setting capacitor 13 discharges along the emitter junction of transistor 8 - resistors 9 and 17 - thyristor control junction 10. The de-capacitor 13 turns on the thyristor 10 and by its internal resistance shunts the switched winding 2 of the transformer 1 and the throttle 3. In this case, the transformer 1 works as a boost. As the capacitor 13 is discharged, the transistor 8 closes and the signal to the control electrode of the thyristor 10 stops. The thyristor is disconnected when an alternating current passes through a zero value.

The output voltage is regulated by varying the alternating voltage of the switching time of the switched winding 2 of transformer 1 and throttle 3 within each half-period.

In the range of variation of the input voltage, the charging currents, the time of the driving capacitor 13 is bridged by the transistor 15 operating in the input voltage boost mode, and the charging time of the capacitor 13 increases. The trimming resistor 22 sets the threshold of the transistor 15.

Claims (1)

Invention Formula A thyristor AC voltage regulator containing a transformer, two primary half windings of which are connected in series, the first extreme terminal of the primary half windings through a choke is connected to the first input terminal, and the second extreme terminal of the mentioned primary half windings is connected to the second input terminal, diode bridge, diagonal | the direct current of which is shunted by the thyristor, and the diagonal of the alternating current is connected between the first input terminal and the common point of the primary semi-windings of the transformer, one secondary winding of the transformer is connected to the output terminals, the other secondary winding of the transformer is connected to the input of the auxiliary two-wavelength terminal, the first output of which is connected The first resistor is connected to the collector of the control transistor and the first terminal of the first capacitor, the second terminal of which is connected to the emitter pack equalizing transistor, an alternating voltage divider, an average output connecting to the base of the controlling transistor, a second voltage divider, a second capacitor, a zener diode, a diode and second and third resistors, characterized in that, in order to simplify while reducing the mass and volume and increase reliability, it introduced a single junction transistor, emitter Editor L. Pchelinska Order 386/53 Compiled by S.Chernishev Tehred I. Popovich Proofreader E. Sirohman Circulation 864 Subscription VNIIGSh of the USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 a rum connected to the collector of the control transistor, the first base through the second resistor connected to the thyristor control terminal, the thyristor control input shunted by the third resistor, the common point of which with the power output of the thyristor is connected to the emitter of the control transistor, and the second base connected to the midpoint the second voltage divider, one extreme. The output of which is connected to the first output of the auxiliary two-pulse rectifier, and the other extreme output is connected directly to to the control transistor and to the zener diode to the second output of the auxiliary full-wave rectifier, the first voltage divider and the second capacitor are connected in parallel through the diode to the output of the auxiliary full-wave drive.