1974-10-03
1976-01-06
Shoop, William M.
321 45C, H02M 7515
Patent
active
039315657
ABSTRACT:
An inverter circuit, having a dc input and an ac output, has an input circuit portion which includes an isolating diode and an input filter including a choke and a polarized capacitor across the dc input. The dc-chopper portion of the inverter circuitry may either be centre-tapped -- where half of the primary winding is in the circuit at any time -- or bridge-type -- where all of the primary winding is in the circuit. In any event, the chopper portion uses SCR's, and has 180 electrical degree commutation; with a commutation capacitor across the primary winding of the output transformer and a commutation choke in series with the SCR's. Feedback is provided by feedback diodes which may be connected to taps on the primary winding of the transformer, or which may be in parallel with the commutation choke, and which in any event are connected in counter-polarity to the polarized input capacitor. The SCR's of the chopper circuitry may be isolated by diodes in series with them, from the primary winding of the output transformer.
REFERENCES:
patent: 3259827 (1966-07-01), Strohmeier et al.
patent: 3317816 (1967-05-01), Wilting
patent: 3340453 (1967-09-01), Bradley et al.
patent: 3349314 (1967-10-01), Giannamore
patent: 3365636 (1968-01-01), Baker
patent: 3366866 (1968-01-01), King
patent: 3378752 (1968-04-01), Naylor
patent: 3379955 (1968-04-01), Koetsch
patent: 3412309 (1968-11-01), Boonstra
Hewson Donald E.
Shoop William M.
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