SU116163A1 - Device for grid control of ion converters - Google Patents

Description

use as a converter the pulses of the RC circuit for converting a sinusoidal voltage into a sawtooth and synchronized multivibrator for further converting the sawtooth voltage into a rectangular one.

Wah FIG. 1 shows the basic electrical circuit of the proposed device for grid control of a three-phase ion converter 1, performed on planar germanium triodes and diodes used to generate output pulses and create the required phase angle; in fig. 2 - pulse forms at different points of the specified scheme.

An alternating voltage with the frequency of the voltage supplying the converter (Fig. 2a) is fed through a low-power three-phase transformer T and a diode D to an integrating link (", forming a saw-shaped voltage across the resistance R" (Fig. 26).

Next, with the link "C", the resistance R is applied, to which the voltage Uu "p is supplied from the source of control voltage. Both voltages have a counter polarity, and the sawtooth voltage is applied by the negative pole to the emitter of the triode P.

The opening of the triode is determined by the point in time when the sawtooth voltage becomes equal to the control voltage. Evident # 116163-2 -

but, by changing the level of charging voltage, it is possible to obtain a change in the time of opening of the triode up to 350 ° (Fig. 2d).

Diode D2 protects the emitter circuit - the base of the triode H1 from a comparatively high negative voltage sawtooth. The diode Oz shunts the input of the triode at positive voltages greater than 0.2 volts.

The trapezoidal shape is removed from the output of the triode II (Fig. 2c). Parallel to the output of the triode I, the differential is switched on, its link RgC g, which allows only the voltage drops of the output of the trioJa I |.

The voltage across the resistance R has the form shown in FIG. 2g. Diode D transmits on the input day of the triode Yag only a positive Idpulse, the start time of which varies depending on the magnitude of the control voltage.

Yaz and Yaz triodes are included in the synchronized multivibrator circuit. At the instant of occurrence of a positive pulse at the input of the triode H2, the multivibrator is transferred and the leading edge of the control pulse is formed at the output of the Iod triode. The impuls duration is determined by the time constant of the RC link.

From the output of the Yaz triode, a pulse through the matching transformer TZ is fed to a power amplifier, made according to the push-pull circuit on powerful triodes P.

The secondary winding of the output transformer Gz produces pulses (Fig. 2c), which ensure reliable control of the converter grids. When the mains voltage fluctuates, the circuit provides an almost proportional movement of the pulse towards maintaining the rectified voltage, automatically stabilizing the latter.

The device can also be applied at a variable frequency supply voltage, which allows its use in independent inverters. To form a multiphase system, the number of phases of the input transformer G is increased.

Subject invention

A device for grid control of ion converters using voltage pulses of adjustable length and phase, consisting of a sinusoidal voltage source, a pulse shape converter and an amplifier, characterized in that, in order to expand the range of regulation and increase the definition of the device, it has As a pulse shape converter, an RC circuit is used to convert a sinusoidal voltage into a sawtooth and synchronized multivibrator to further convert a sawtooth th voltage forms a rectangular.

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FIG. 2