SU681522A1 - A-c thyristor voltage controller - Google Patents

Description

: 54) THYRISTOR AC VOLTAGE REGULATOR

The anodes of the diodes of the first of the mentioned chains include the additionally introduced capacitors, and the alternating impedance element is connected between the combined anodes and the united cathodes of the diode chains.

The drawing shows the scheme of the proposed controller.

Opposite-parallel connected thyristors 1 and 2 are the power part of the controller. Threshold elements 3 and 4, such as dinistors, are included in the thyristor control electrode circuits.

In parallel, the thyristors included a chain of counter-connected diodes 5 and 6, the cathodes of which are combined. Another chain has diodes 7 and 8, united by anodes. The interconnection of the combined cathodes of diodes 5 and b and the combined anodes of diodes 7 and 8 is connected to alternating impedance elements, for example, a variable resistor 9 and 10. Between the points of connection of the threshold elements 3 and 4, with the corresponding diodes 7, 8 and anodes of diodes 5, b, including capacitors 11, 12. Load 13 is switched on in series with thyristors 1 and 2.

The device works as follows.

In one of the half-periods of the supply voltage, when the input terminal is positive and the circuit is upper, a charge circuit of capacitor 12 is formed through diode 5, resistors 9, 10, diode 8 and load 13, capacitor charge

11 does not happen due to diode 7. When the voltage on the capacitor

12 will reach the switching threshold of element 4, the thyristor 2 will turn on and a voltage will be applied to the load during the remaining part of the half period. At the reverse half-wave of the supply voltage, a charge circuit of capacitor 11 is formed through diode b, resistors 9 and 10, diode 7 and load 13. Diode 8 prevents charging of capacitor 12. When the voltage on the capacitor 11

reaches the switching threshold of element 3, the capacitor 11 is discharged to the control transition of the thyristor 1, causing it to turn on. The load of the reverse half-wave will be applied to the load 13 during the remaining part of it.

Variable resistor 10, change the charge rate of the capacitors 11 and 12, and thus the time of unlocking the thyristors 1, 2 relative to the beginning of the corresponding half-wave

supply voltage, i.e. regulate the voltage at the load 13.

Claims (4)

Invention Formula Thyristor AC voltage regulator, made in the form of two opposite-parallel connected 0 thyristors, in parallel with which a chain of two oppositely connected diodes is connected, whose cathode is connected, and containing another chain of two diodes,  connected by anodes, the cathodes of which are connected to the control electrodes of the thyristors, characterized in that, for the purpose of simplification, The indicated connection is in the form of additionally introduced threshold elements, between whose points of connection with the cathodes of the diodes and the anodes of the diodes of the first of the mentioned chains there are included additionally introduced capacitors, and between the combined cathodes and the combined anodes of the diode chains an element of variable impedance is included. Sources of information taken into account during the examination 0 1. USSR author's certificate No. 377753, cl. H 02 R 13/16, 1970. 2. US patent number 3665212, 307-252, 1972.. 3. Dentry F. et al. Controlled 5 semiconductor valves. M., World, 1967. 4. USSR author's certificate No. 519831, cl. H 02 M 5/257, 1974.