SU801201A1 - Pulse-phase control device - Google Patents

Description

one

The invention relates to educational technology and can be used in control systems for valve converters.

A device for phase-pulse control is known, which contains DC and AC power sources, a resistor, a capacitor and a transformer, the secondary winding of which is connected to the capacitor through a diode l.

The disadvantage of this device lies in the small range of the steering angle.

The closest in technical essence to the present invention is a device for phase-impulse control, containing DC and AC power supply sources, a control voltage source, a diode resistor, a thyristor, a capacitor, a comparator, and a transformer, and the capacitor is connected to a pair of pairs. from the comparator inputs to the capacitor, the second input to the control voltage source, a. output - to the control electrode of the thyristor, the primary winding of the transformer is connected to the AC power source, the thyristor anode

connected to a positive no.niocy of a DC power supply

2

A disadvantage of the known device lies in the small range of the steering angle.

The aim of the invention is to expand the control angle range.

The goal is achieved by the fact that the device for phase-pulse control is additionally equipped with a diode, the thyristor cathode connected to the negative pole of the DC power supply through a diode and a resistor to which the secondary winding of the transformer is also connected via an additional diode, and both diodes are connected to cathodes one conclusion thyristor.

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The drawing shows a diagram of the device.

The device contains a diode I, the cathode of which is connected to one KOHUJJ resistor 2, the other end of which

Claims (2)

5 is connected to the negative pole of the DC source. The diode anode is connected through a parallel-connected capacitor 3, a thyristor 4, and one input of the comparator 5 connected to the positive pole of the DC source. The other input of the comparator is connected to the source of the control signal 6, and its output is connected to the control electrode of the thyristor. A secondary winding 7 of the mains transformer is connected to the resistor. 8 through additional diode 9 so that both diodes are connected to the common point of the resistor by cathodes. The primary winding 10 of the mains transformer is connected to the AC mains, to which the power converter valve circuit is also connected. The device works as follows. In the positive half-period of the voltage on the secondary winding of the transformer at the time of the voltage of the DC source Un, diode 1 opens, diode 9 closes and capacitor 3 begins to charge from the source Uq through diode 1 and resistor 2. At the moment of equality, the voltage capacitor 3 ... control voltage 6, kompyytor.or 5 produces a pulse 4v. direction. ,, monitors the exit and on the "1p 1vl yu1tsyy eleklggrod thyristor 4. Thyristor Jf Sh ae c - and capacitor 3 is discharged by the voltage included |: 1) ishrm. The thyristor remains open and the current flowing from the source of the svs diode 1 and the resistor 2 is left) with a part of the positive half-period and the entire negative half-period. In the next positive half-period, when the voltage on the secondary winding of the transformer is increased to the value of and, -, diode 9 is unlocked, and diode 1 and thyristor 4 are locked, preparing the circuit for the next cycle. The proposed device has an extended control angle range and, in addition, provides a parametric stabilization of the output voltage when the supply grid voltage varies, since with such changes the capacitor charge start and control times change accordingly. The invention The device for phase-pulse control, containing DC and AC power sources, a control voltage source, a diode, a resistor, a thyristor, a capacitor, a comparator and a transformer, the capacitor connected in parallel to the thyristor, one of the comparator inputs - to a capacitor, the second input - to the source of the control voltage, and the output - to the control electrode of the thyristor, the primary winding of the transformer is connected to the power source of alternating current, the anode of the thyristor is connected to put The power supply of the direct current source, characterized in that, in order to expand the control angle range, it is additionally equipped with a diode, and the thyristor cathode is connected to the negative pole of the direct current power supply through a diode and resistor, which is also connected to the secondary transformer through an additional diode, with both diodes connected by cathodes to one output of the resistor. Sources of information taken into account during the examination 1. AL Pisarev, L. Detkin. Control thyristor converters. M., Energie, 1975, p. 31, Fig. 2-5. 2. Authors certificate of the USSR 547934, cl. H 02 M 1/08, 1974.