SU699622A1 - Device for pulse-phase control of thyristor - Google Patents

Description

one

This invention relates to electrical engineering, in particular, to control devices for thyristor AC switches.

A device for controlling the Thyristor is known, based on the vertical control principle ij.

A disadvantage of the prior art is the narrow functionality of the possibilities.

It is also known a device for phase-pulse control of a thyristor, which contains sources of constant control and variable sinusoidal signals, the voltages of which are summed algebraically, then rectifies and is fed to the input of the impulse former as a blocking voltage. The pulse shaper (} adjusts the control pulse at the moment when the blocking voltage crosses the level of the pulse. The pulses from the driver start are controlled by the thyristor.

However, the known device has the disadvantage that to change the phase of the control pulses from 0 to 90 the polarity of the constant control voltage source must be one, and to change the phase from 90 to 180, the source polarity must be changed to the opposite. Thus, with the automatic change of the phase of the control pulses, it is necessary to provide a block that monitors the change in the phase of the control impedances and changes the polarity of the source of the control voltage to the opposite when the Control Phase passes through 90. This complicates the device and limits its functionality.

The goal of the device is to simplify and extend the functionality of the device.

Claims (2)

For this, the known y - (- Tf-x i rTfvi for the phase-impulse control unit is also supplied 4.1) with the j RC-chain, and the IK of the ii-x-Tostn control voltage is reversible, with the phase resistor connected between from the terminals of the alternating voltage source and one of the ac inputs of the bridge bridge, the source of constant control of the voltage between the second clamp of the alternating voltage source and the second; A non-current bridge rectifier input and a phase-shifting capacitor are connected between the second terminal of the alternating voltage source and the connection point of the resistor and the first AC input of the bridge. FIG. 1 — thyristor pulse-phase control device; FIG. 2 voltage chart. The device contains a variable control voltage source 1, a phase-shifting Chain 2, a constant control voltage source 3, a bridge circuit 4, and a pulse shaper 5. The device works as follows. On bridge, bridge 4 is supplied with alternating voltage from source 1, shifted by 90 RC-chain 2, and voltage from source 3. The voltage amplitude of the reference signal source is chosen equal to the amplitude of alternating voltage of source 1. Shaper of 5 pulses, as which can be used by any generator operating in self-oscillating mode, generates a control pulse at those times when the voltage at its input is zero. The diagram indicates, and is the network voltage; the voltage on the secondary winding of the transformer of the alternating voltage source is the voltage taken from the phase-shifting RC - chain 2; source voltage 3; Ux is the voltage at the output of the full-wave bridge exponent 4. When the constant control voltage changes in the range 2 (U), U g, Uj 6 QP, the time t, b, the moment when the voltage goes to the input of the forming unit 5 of the pulses goes to zero, the phase of the pulses at the output of the forming unit will change accordingly. The range of change of the phase of the pulses is about 80 °. Phase-shifting chain 2, the phase shift at –90, allows to phase and the pulse at the output of the transmitter with the moment of zero crossing of the source 1, when the apr of source 3 is zero. Apparatus of an Inverter for Thyristor Phase-Pulse Control, comprising a phase-shifting unit consisting of a bridge rectifier whose diagonal of alternating current is connected to series-connected sources of alternating and constant control voltage, connected to a diagonal of direct current of the bridge Top viewer, characterized in that, in order to expand the functional possibilities of the components, it is additionally equipped with a phase-shifting RC-chain, and the source of constant control is its voltage is made reversible, with the phase-shifting RC-chain resistor being connected by one of the AC voltage source terminals and one of the AC rectifier bridge inputs, the constant control voltage source between the second AC voltage source terminal and the second AC input bridge the bridge, and the phase capacitor of the RC circuit is connected between the second terminal of the alternating voltage source and the connection point of the resistor and the first AC input of the bridge shr DC converter. Sources of information taken into account in the examination 1.Rivkin G. A., Conversion devices. M., Energie, 1970, p.316. 2. USSR author's certificate number 343350, cl. H 02 R 13/16, 1971.