SU1638712A1 - Thyristor voltage regulator - Google Patents

Abstract

The invention relates to the secondary power supply sources of electronic equipment. The aim of the invention is to increase the efficiency while simplifying the device. Thyristors 2,3 together with filter 14, 15, 16 form a mid-wave full-wave adjustable rectifier. The output voltage is monitored by an error signal amplifier on the transistor 10. When the output voltage taken from the output voltage divider 13 resistor is less than the reference voltage, the transistor 10 is locked and the current flowing from one of the output half windings of the transformer 1 saturates the control transistor 8 , which leads to the inclusion of a thyristor, on the anode of which there is a positive potential. If the output voltages are higher than the required, the control transistor 8 and, therefore, the thyristors 2 and 3 are closed, which ensures the stabilization of the output voltage. 1 il. with s

Description

0

co oo j

g

J16

The invention relates to electrical engineering, in particular, to converter technology, and can be used in electrical installations for various purposes, for example, for supplying stabilized voltage to radio engineering devices, as well as as a voltage regulator for pulse converters.

The purpose of the invention is to increase the efficiency while simplifying the thyristor voltage regulator.

The drawing shows a schematic diagram of a thyristor voltage regulator.

The thyristor voltage regulator contains a mains transformer 1 with a series-connected thyristor regulating element on thyristors 2 and 3, to the control inputs of which is connected via a error signal switch made on diodes 4-7, a error signal amplifier containing a transistor 8 with the resistor 9 in the emitter circuit, limiting the current of the control electrodes of the thyristors, to the base of the transistor 8 a collector 10 is connected with the diode 11 in the emitter circuit, acting as a sensor of the reference voltage and, and a resistor 12 in the collector circuit. The amplifier input of the error signal is connected to the output of a voltage divider made on resistors 13 and 14, and the input of the latter is connected to the output of a DLC filter made on a diode 15, inductor 16 and capacitor 17. The load is connected to the terminals of the capacitor 17.

Thyristor voltage regulator works as follows.

When one of the thyristors (suppose the second one) turns on the negative voltage on the cathode, the latter turns on, the filter capacitance is charged, as the current flows through the circuit: middle transformer pin - resistor 9 - open transistor 8 - open diode 6 - thyristor control electrode — thyristor cathode — first transformer lead. The transistor 8 is in the open state, since a mixture is fed to its base through resistor 12 and open diode 4, while the thyristor 3 and diodes 5 and 7

Q

five

0 5 0 5 0

0

five

closed by reverse half wave. In the next half-wave, diodes 4 and 6 and thyristor 2 are closed, and diodes 5, 7 and thyristor 3 are opened, i.e. switching of the error signal amplifier from thyristor 2 to thyristor 3, and vice versa.

As the voltage across the capacitor of the filter 17 increases above the set value, transistor 10 opens and decreases the voltage at the base of transistor 8, which leads to a decrease in current through the open thyristor control electrode. At some value, the thyristor is closed (since the reverse voltage is applied to the thyristors at each period and, in addition, the error signal amplifier operates with a pulsating current). After that, the voltage on the capacitor 17 begins to decrease, the transistor 10 is closed again, and the transistor 8 opens and turns on one of the thyristors. The process then repeats.

Claims (1)

The diode 15 is designed to return the energy stored in the choke 16 to the load when the thyristors are switched or turned off. Invention Formula A thyristor voltage regulator containing a power transformer, the primary winding of which is connected to the input pins, and the secondary is made with a midpoint, first and second thyristors, first and second diodes, a DLC filter, output connected to the output pins, shunted by an output voltage sensor, an amplifying transistor, the base connected to the output of a voltage sensor, an emitter connected through a reference source to the first output terminal, and a collector to the first output of the first resistor, A resistor and a control transistor, characterized in that, in order to increase efficiency while simplifying, the third and fourth diodes are introduced into it, the anodes of which are connected together and connected to the collector of the control transistor, the cathodes of the diodes are connected to the first and second thyristors, the anodes of which are connected together and connected to the anode of the diode of the DLC-filter whose cathode is connected516337126 to the midpoint of the secondary winding anodes of which are connected together and the hems of the mains transformer connected to the second output of the first circuit with the first output terminal of the resistor, the emitter of the control terminal of the secondary winding of the resistor through the second resistor of the transformer connected to the first output pin base the cathodes of the corresponding thyristor control transistor is connected to and the cathodes of the first and second diodes, the collector of the amplifying transistor.