SU512551A1 - Device for controlling inverter thyristors - Google Patents

Description

one

The invention relates to the field of converter technology and can be used to control the inverter thyristors.

The known devices for controlling the inverter thyristors, which contain a generator of rectangular pulses, with several outputs, each of which are connected to the inverter thyristor control circuits through a corresponding differentiating capacitor, are structurally complex and cumbersome and because of this have low reliability of operation.

The proposed device does not have the indicated disadvantages due to the fact that it is equipped with a phase control unit and corresponding to the number of outputs thyristors, each of which is shunted by a counter diode and connected at the output of the square-wave generator in series with the differentiating capacitor, and the control circuits of these thyristors are connected to the output of the phase management

The drawing shows a schematic diagram of the described device.

The device consists of a driving generator of rectangular pulses 1, a phase-shifting device 2, distribution transformers 3 and 4, capacitors 5, thyristors 6, counter-diodes 7, cut-off diodes 8 and a driver of powerful output pulses 9

9

The thyristor 6 is controlled by a phase-shifting device 2, the synchronization of which is carried out by the master oscillator m 1. The rectangular pulses taken from the output windings of the master oscillator 1 are shifted relative to each other lia 180 el. hail.

Let the shift angle of the phase-shifting device 2 be 0. Then, with the arrival of a positive rectangular pulse of the master oscillator, the thyristor 6 opens and the current passes through the circuit: thyristor b capacitor 5, the primary winding of the distribution transformer 3. In one of the output windings we get a differentiated positive IMPULSE 10.

When changing the polarity of the rectangular

impulse of the master oscillator, the current flows through

circuits: primary distribution winding

transformer 3, capacitor 5, counter

diode 7.

In another output of the distribution transformer, we obtain a reference pulse 11, which is shifted by 180 e relative to the pulse indicated above. hail.

In the distribution transformer 4, the process proceeds in a similar way, with the pulses 12 and 13 being removed from the output windings shifted relative to the corresponding pulses 10 and 1 by 180 el. hail.

Thus, at the output of distribution transformers, we obtain four separation pulses. These pulses are applied to shapers of powerful output pulses 9.

When the phase angle of the phase-shifting device changes, the process of forming the reference pulses 11 and 13 occurs as described above, and the formation of the pulses 10 and 12 occurs with a change in the phase shift angle relative to the pulses 11 and 13, which is determined by the delay in the supply of control pulses from the phase-shifting device to turn on the thyristor 6

Claims (1)

An apparatus for controlling an inverter thyristor, comprising a generator of rectangular pulses in two or more outputs, each of which is connected to an inverter thyristor control circuit through a corresponding differentiating capacitor, which, in order to simplify and extend the functionality, is provided by the phase control unit and thyristors by the number of generator outputs, each of which is clamped by a counter diode and switched on at the output of the square-wave generator by It has been consistent with a differentiating capacitor, and a control circuit of the thyristors connected to the output of the phase control unit.