Control of a discontinuous current by a thyristor rectifier with

Details Control of a discontinuous current by a thyristor rectifier with Control of a discontinuous current by a thyristor rectifier with

1991-12-20

1993-11-09

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 57, 363 85, 363139, H02M 5443

Patent

active

052608638

ABSTRACT:
For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from the rectifier, keeping gate voltage on as long as thyristor current is on. A discontinuous thyristor converter current signal is detected and used to generate an enable signal in conjunction with a thyristor gate voltage. The enable signal, in synchronism with a power supply line voltage, provides a pair of channeling signals which then, depending upon whether the field current is positive or negative, activate the gate voltages of the thyristors such that the gate voltages end exactly at that time, within a given half-wave, where the generator field current becomes discontinuous.

REFERENCES:
patent: 3365649 (1968-01-01), Shaw
patent: 4891741 (1990-01-01), Slattery

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