SU1628169A1 - Single-channel rectifier control device - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve the quality of the output voltage of the rectifier by reducing the asymmetry of the control pulses. The device for controlling the rectifier comprises a synchronization unit 1, a phase shifting unit 2, a frequency multiplier 3, a pulse distributor 4, output drivers 5. The frequency multiplier 3 is designed with a phase locked loop. 1z p. F-ly, 1 ill.

Description

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The invention relates to a converter technique and can be used to control single-phase and multi-phase controlled rectifiers.

The purpose of the invention is to improve the quality of the output voltage of the rectifier by reducing the asymmetry of the control pulses.

The drawing shows the functional diagram of the device.

The device contains a series-connected synchronization unit 1, a phase-matching unit 2, a frequency multiplier 3, a distributor of 4 pulses, the input of the synchronization unit being intended for connection to one of the mains phases and output drivers 5.

The multiplier 3 with phase-locked loop contains sequentially connected block 6 of the pulse delay. a period-to-voltage converter 7, an analog key 8c memory, a voltage-to-frequency converter 9, and a phase detector unit 10, the input of the pulse delay unit being the multiplier input, the output of the voltage-frequency converter 9 the output of the multiplier 3, the control input of the analog switch 8, and the first input of the phase detector unit 10 are connected to the input of the pulse delay unit 6, the second input of the phase detector unit 10 is connected to one of the outputs of the distributor 4 pulses, the output of the phase detector unit 10 connected to the control input of the converter of period 7 to voltage. The outputs of the distributor 4 pulses are designed to be connected to the output driver 5.

The frequency multiplier generates pulses of frequency K fc, where K is the number of control channels synchronized with one of the phases of the mains supply. The input of the synchronization unit 1 is designed to be connected to one of the phases of the mains supply and, at the output, forms a sawtooth voltage, frequency O, to the input of the phase-shifting unit 2, the second input of which is intended to be connected to the control voltage source Uy. The pulses from the output of the phase-shifting unit 2 are fed to the input of the multiplier 3 frequency. Serially connected period-to-voltage converter 7, analog memory key 8 and voltage-to-frequency converter 9 form a fast uncorrected frequency multiplier. To accurately multiply the frequency, elements are inserted an integer number, times

connection, which includes the distributor 4 pulses and the block 10 of the phase detector. The analog switch 8, when a pulse arrives from the output of the phase-shifting unit 2, stores the voltage at the output of the converter 7 period to voltage, representing a generator of linearly varying voltage with a variable slope with synchronized pulses at the output of the delay unit 6. The delay time of the pulse in block 6 should not be less than the sampling time when the analog switch 8 is closed. The change in the conversion slope corresponds to the change in the signal at the output of the block 10 of the phase detector. The moment of signaling of the change in the slope of the conversion depends on the phase difference at the inputs of the phase detector unit 10. After the phase-locked loop system is included in the synchronism in the steady state, the exact frequency of the input pulses is multiplied by K times.

The proposed single-channel rectifier control device ensures that the control pulses are not completely asymmetric in a steady state, thereby improving the quality of the rectified voltage in the absence of subharmonic pulsations for any number of power supply phases.

Claims (2)

1. A single-channel rectifier control device, comprising a sequentially connected synchronization unit and a phase-shifting unit, a pulse distributor, characterized in that, in order to improve the quality of the rectified voltage by reducing the asymmetry of the control pulses, between the phase-matching unit and the pulse distributor is on a frequency multiplier with a multiplication factor equal to the number of channels of the pulse distributor, and the input of the synchronization unit is designed to be connected to one of the phases of the mains supply. 2. Pop-1 device, characterized in that the frequency multiplier is made with phase auto-frequency tuning and contains a series-connected pulse delay unit, a period-to-voltage converter, an analog key with memory, a voltage-to-frequency converter, a phase detector unit, the input of the pulse delay unit is the input of the multiplier, the output of the voltage to frequency converter is the output of the frequency multiplier, the control input of the analog switch with memory, and the first input of the phase detector unit The output of the phase detector unit and the input of the phase detector unit are connected to the control input and converted to one of the outputs of the period body distributor in a voltage.