SU428504A1 - DEVICE FOR LAUNCHING TIRISTORS - Google Patents

Description

one

The invention relates to high-power thyristor generators and can be "utilized," for example, in devices for generating the supply voltages of the "betatron currents."

From the first, devices for starting tirlstors, connected in series, contain in the control circuit of each thyristor a secondary winding of a multiple-winding switching current transformer, the primary current of which is a single high-voltage insulated current-carrying busbar passing through all the transformer cores, and a key with a drive . Such devices can form entrainment pulses with the required amplitude, but with a front duration that is one to two times higher than the required one. This leads to a variation in the moments of switching on individual thyristors, overvoltage on thyristors and their breaking out.

The proposed device differs from the known ones in that it contains a multi-link sharpening non-linear delay line with saturable inductances and a short-circuited feedback loop between the inductance of the last and the last but one link, the code of which is connected in parallel to the little key consisting of and storage, and the output - directly to the primary winding of the current transformer.

This embodiment of the device allows to increase the reliability and improve its performance characteristics.

In the drawing, yes. On the electrical circuit of the device described.

The trigger circuits of series-connected thyristors 1-4 include the secondary windings of the transformer, made on the cores 5-8. The primary winding 9 of the transformer is a single current-carrying wire. Charger 10 is connected to a bezel // connected in series with a history key 12. A nonlinear delay line containing nonlinear inductances 13-16 with ferromagnetic cores connected through capacitors 17-20 to a common bus 21 forms a link that connects capacitor drive 11 to the primary winding 9 of the transformer. Inductances 15 "16 have a common coil of 22 s zi. The end of the primary winding 9 of the transformer is connected

through a resistor 23 to the common bus 21.

The device works as follows. In the initial state, thyristors 1–4 are connected to a voltage, storage device // charged from a charging device 10. When supplying

control emulsion on tristor

the key 12 is last opened and the inductances 13-, 16 begin successively in time to saturate. Due to the fact that the delay time of a non-linear line formed by inductances 13-le and capacitors 17-20 is different for different phases of the pulse, the leading edge of the pulse is sharpened.

Immediately after switching on the key 12, almost all the voltage is applied to the inductance 13. After saturating the inductance 13 and charging the capacitor ./7, the main part of the voltage is applied to the inductance 14 and then to the inductance 15 and 16. An impulse transformed through a common the coil 22 of the additional connection, from the inductance 15, is transmitted to the inductance winding 16. The polarity and magnitude of the induced impulse in the inductance 16 is such that until the inductance is saturated, the voltage at the output of the line ovnomu momentum. The parasitic oscillations on the amnlitude are less than this induced and shulse, which excludes damage (the thyristors start up / -4 at a low current level, i.e., the thyristors can fail when started with a control current deficit. When the inductance 16 is saturated, through the primary winding 9 the transformer has a heightened pulse

a current whose front is one to two orders of magnitude smaller than the front of a current pulse without using a line.

Resistor 23 reduces the effect of individual starting circuits on the current pulse in winding 9 and is not a fundamentally necessary element.

Subject invention

/ Device for recording thyristors connected in series, containing in the control circuit of each thyristor a secondary winding of a multiple-winding pulsed current transformer, the primary winding of which is a single high-voltage insulated current-carrying busbar passing through all the transformer cores, and that, in order to increase reliability and improve performance, it contains a multi-link exacerbating non-linear delay line with syschayuschimis inductance coil E and korotkoZamknutsh feedback inductance between the latter and E iredposlednego units, whose input is connected parallel to the chain consisting of a key and the accumulator, and the output - directly to the primary

0 winding current transformer.