SU624348A1 - Unipolar control pulse shaper - Google Patents

Description

The invention relates to the field of electrical engineering and can: be used to control thyristors of high voltage semiconductor valves.

Devices are known for simultaneously controlling a large number of series-on-parallel-connected thyristors fl, 2.

The disadvantage of such devices is low efficiency and. not enough steep Q front edges of output pulses.

The closest technical solution to the present invention is a single-pole control-5 driver pulses, comprising a half-bridge thyristor current inverter with a capacitive midpoint, a switching node made in the form of a forming LC line, and a transformer output device-. 20

The disadvantage of this former is the appearance of additional pulses at its outputs, which are caused by the energy stored in the magnetic field.

water to the output device, and are a nuisance.

The purpose of the invention is to eliminate the effect on the output pulses of energy stored in the magnetic circuit of the output device.

The goal is achieved by the fact that in the driver of unipolar control impulses; Sov, containing a half-bridge serial current inverter with a capacitive midpoint, a switching node, made in the form of forming LC,) And a transport output device with some secondary windings, in whose circuits are included rectifying diodes of the latter are made in the form of two transformers on separate cores with the primary windings connected in turn, the switching node being connected to the common point of the primary windings of the transformer Ator, the other terminals are connected to the thyristors shaper.

The drawing shows the scheme of the described device.

The device contains a half-bridge serial current inverter with capacitors 1 and 2t forming a capacitive medium nyutochku, power thyristors 3 and 4, switching node 5 made in the form of a ifC-line, and an output device on transformers 6 and 7, in the secondary circuits The windings of which include rectifying diodes 8 and loads 9 and 10.

The device works as follows.

When sequential control pulses are applied to thyristors 3 and 4 at loads 9 and 1O, monopolar pulses alternately appear, the amplitude, duration and shape of a {1X) are determined by the frame: LC-forming line of switching device 5,

After the pulse has passed through the corresponding transformer 6 or 7, a secondary voltage pulse appears on its secondary winding, due to the energy stored by the transformer core during the transmission of the main pulse. The polarity of the additional pulse is opposite to the polarity of the main pulse, and it is cut off by the rectifying diode 8 and does not fall into the load 9.

Since the output device is made on transformers with separate cores, an additional pulse is prevented from entering the adjacent channel, which completely eliminates the effect on the outgoing pulses of energy stored in

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magnetic circuits of transformers of the output device.

F o

rmula of invention

A shaper of unipolar control pulses, containing a half-bridge serial thyristor current inverter with a capacitive midpoint, a switching node made as a forming LC line, and a transformer output device with several secondary windings, in the circuits of which there are rectifying diodes, characterized in that In order to eliminate the effect on the output pulses of energy stored in the magnetic core of the output device, it is made in the form of two transformers on separate cores with primary connected windings, and the switching node is connected to the common point of the primary windings of transformers, the other terminals of which are connected to the thyristors of the driver.

 Sources of information taken into account in the examination:

1.Poyurovsky V.Ye. A pulse generator for controlling a large number of series-parallel-connected thyristors. Materials NTK LEIS, 1968, no. 4, s. 37.

2. The UK patent number 1091748, cl. H 2F, 1965.

3. The patent of Great Britain No. 1091749, cl. H