Voltage limit protection circuit for phase controlled rectifiers

Details Voltage limit protection circuit for phase controlled rectifiers Voltage limit protection circuit for phase controlled rectifiers

1983-02-28

1984-12-11

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 52, H02H 7125

Patent

active

044882122

ABSTRACT:
A voltage limit circuit for phase controlled rectifiers avoids shoot-through and limit cycling conditions by limiting the d.c. output voltage of the rectifier bridge. The circuitry follows a voltage reference signal as long as the reference signal is less than an input derived from the a.c. voltage applied to the bridge, reduced by the volt-seconds required for commutation. Should the reference signal exceed the a.c. derived input, the a.c. derived input limits the maximum available d.c. voltage. To this end, a voltage reference signal provides an output signal corresponding to the desired output voltage of the bridge. A slew limit circuit limits the rate by which the output signal may be changed. A magnitude limit circuit is coupled to the output of the slew limit circuit and provides a reference signal for the firing circuit of the rectifier bridge. The magnitude limit circuit receives the a.c. voltage derived limiting signal for limiting the reference signal to a magnitude not greater than that established by the limiting signal. The limiting signal is obtained in a commutating volt-seconds subtraction circuit that reduces an appropriately scaled a.c. voltage by an amount necessary to establish the volt-seconds required for commutation of the controlled rectifiers.

REFERENCES:
patent: 3484676 (1969-12-01), Wilkerson
patent: 4150325 (1979-04-01), Miller et al.
patent: 4310866 (1982-01-01), Wirth
patent: 4423477 (1983-12-01), Gurr

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