Method and apparatus for operating a load controlled inverter

Details Method and apparatus for operating a load controlled inverter Method and apparatus for operating a load controlled inverter

1976-09-08

1977-08-02

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

H02M 700

Patent

active

040399230

ABSTRACT:
A method and apparatus for determining the commutating and protection time in the operation of a load controlled inverter, particularly of a parallel resonant circuit frequency converter, in which the firing instant of the thyristors prior to the zero crossing of the resonant circuit voltage is derived from the intersection point of two measured voltages, one proportional to the resonant circuit voltage and the other including the sum of two voltages, one of which leads the resonant circuit voltage by 90.degree. and is proportional to the product of the resonant circuit frequency and the first measured voltage, and the other of which is proportional to the inverter output current, permitting the current dependent commutating time along with the constant protection time to be unequivocally determined.

REFERENCES:
patent: 3684936 (1972-08-01), Graf
patent: 3718853 (1973-02-01), Graf
patent: 3852657 (1974-12-01), Skogsholm et al.
patent: 3919620 (1975-11-01), McMurray et al.

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