SU799097A1 - Device for control of thyristor-based power-diode converter - Google Patents

Description

(54) DEVICE FOR CONTROLLING VENTILATING CONVERTER ON THIRISTORS

accurate synchronization with network voltage. ,

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that in the device for controlling the valve converter on thyristors, containing an alternating voltage source, synchronized with, a diode bridge rectifier, time specifies the RC circuit, the resistor time specifying the HC circuit is made adjustable, the threshold element installed in the control circuit a thyristor, a series-connected alternating voltage source and a capacitor, the time of the driving RC circuit, are included in the diagonal of the diode bridge rectifier, the other of which is diagonal Without an adjustable resistor, the master circuit time is an output for connecting the load, the threshold element is installed in the diagonal of another bridge, the two adjacent arms of which are formed by diodes connected by cathodes to the capacitor, the master circuit time, and the other two arms are serial connections of the diodes and primary The windings of the impulse transformers introduced, the secondary windings of which through a diode and limiting resistors form an output for connection to the junction of the control electrode to the thyristor atom. The drawing shows a circuit diagram of a device for controlling a valve converter on thyristors, for example a single-phase bridge rectifier.

The thyristor rectifier control device 1-4, which operates on load 5, consists of a variable voltage source b, made in the form of an isolation step-down transformer, a capacitor 7, the time of the driving RC circuit, a bridge rectifier on diodes 8-11, an adjustable resistor 12 the time of the driver circuit, diodes 13-16 included in the bridge circuit, the threshold element (dynistor) 17 installed in the diagonal of the bridge of pulse transformers 18 and 19, diodes 20, limiting resistors 21.

The device works as follows.

Let the secondary voltage of the source transformer b have polarity; corresponding to the presence of a positive potential on the upper terminal of the winding. Transformer secondary circuit – diode 11 – load 5 –– adjustable resistor 12 – diode 8 starts charging capacitor 7. At the moment when the voltage on it reaches the threshold value of the response of the dynistor 17, the latter switches, and the capacitor 7 discharges along the coil transformer 18-diode 16-dinistor 17-diode 1-3 generates impulses on the secondary windings of the Trinsformer 18, which include thyristors 2 and 3 rectifiers. In this case, the load voltage 5 closes the diodes 11 and 8, preventing the recharge of the capacitor 7 during one half period. When the voltage polarity changes, the power supply to the capacitor 7 begins to be charged along the circuit diode 10-load 5-resistor 12-diode 9-secondary transformer winding b. When the dynistor 17 is triggered, control pulses are generated on thyristors 1 and 4. Next, the order of operation is repeated.

By eliminating the possibility of re-charging the capacitor during one half-period, the absence of control pulses on the thyristors with a negative anode offset, the proposed device is more reliable in operation and can be used to control both zero and bridge circuits while maintaining the simplicity of the circuit.

Claims (3)

Invention Formula A device for controlling a thyristor gate converter, containing an alternating voltage source, a diode bridge rectifier synchronized with the network, a time setting the RC circuit, the time setting of the setting RC circuit being made adjustable, the threshold element installed in the thyristor control circuit differs from By the fact that, in order to increase the reliability of the device operation, the AC voltage source and capacitor are connected in series; the time of the driving RC circuit is included in the diagonal of the diode bridge rectifier The other diagonal of which through an adjustable resistor is the time of the master circuit is an output for connecting the load, the threshold element is installed in the diagonal of the other bridge, the two adjacent arms of which are formed by diodes connected by cathodes to the capacitor of the time of the master KS circuit, connections of diodes and primary windings of impulse transformers introduced, the secondary windings of which through diodes and limiting resistors form an output for connection to a control junction th electrode-cathode thyristor. Sources of information taken into account during the examination 1. Semiconductor rectifiers. Ed. Kovalev F.I. and Mostkovoy G.P. M., Energie, 1967, p. 403, fig. 9-21. 2. US patent No. 3437841, CL.307252, 1969. 3. Thyristors. Technical reference. Translated from English, ed. LabunttOBa V.A. :and etc. . M., Energie, 1971, p. 242, fig. 9-35 (prototype).