Device for controlling a Graetz rectifier bridge

Details Device for controlling a Graetz rectifier bridge Device for controlling a Graetz rectifier bridge

1978-03-22

1980-01-29

Shoop, William M.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

318345G, 318722, 363 96, H02M 545

Patent

active

041864352

ABSTRACT:
The invention comes within the field thyristor bridge control.
A device for controlling a Graetz rectifier bridge for driving a synchronous machine which operates at variable speed, it being connected to this machine by its AC terminals and its voltage at the terminals being substantially proportional to its frequency, characterized in that the firing pulses of each thyristor of the Graetz rectifier bridge come from the comparison of a control signal U.sub.c chosen as a function of the required firing angle .alpha. of the thyristor to be fired, with a sinusoidal phase reference curve whose amplitude is made independent from the operation frequency of the Graetz rectifier bridge.
The invention applies in particular to the driving of synchronous rotating machines which operate at variable speed.

REFERENCES:
patent: 3612973 (1971-10-01), Kuniyoshi
patent: 3719873 (1973-03-01), Graf
patent: 4008421 (1977-02-01), Bird
patent: 4028607 (1977-06-01), Watanabe

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