Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1991-03-18
1992-04-21
Sterrett, Jeffrey L.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363136, 378107, H02M 7521
Patent
active
051074125
ABSTRACT:
A series resonant circuit is coupled to a direct voltage source via two push-pull connected thyristors and diodes connected inverse-parallel there across. A zero-crossing detector generates a zero-crossing signal as soon as the thyristor ignition pulse current through the series resonant circuit drops below a given value after its zero crossing, and an ignition pulse generator which is controlled by the zero-crossing detector generates ignition pulses for the thyristors. To prevent unintended interruption of the inverter operation, a measuring device measures the time interval between an ignition pulse and the subsequent zero-crossing signal, a memory stores the time interval for normal operation, and a circuit generates an auxiliary zero-crossing signal when the measured time interval exceeds the stored time interval by more than a predetermined value.
REFERENCES:
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patent: 4488213 (1984-12-01), Buikema
patent: 4514795 (1985-04-01), van der Zwartt
patent: 4638138 (1987-01-01), Rosa et al.
patent: 4653082 (1987-03-01), Tsuchiya
patent: 4713220 (1987-12-01), Huynh et al.
patent: 4805081 (1989-02-01), Chambers et al.
Squire William
Sterrett Jeffrey L.
U.S. Philips Corporation
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