H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/54
H02M 7/523 (2006.01) H02M 7/515 (2006.01)
Patent
CA 1128990
INVERTER CIRCUITS ABSTRACT OF THE DISCLOSURE: An inventor 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 invertor circuitry may be either center-tapped -- where half of the primary winding is in the circuit at any one time -- or bridge- type -- where all of the primary winding is in the circuit at any instant. In any event, the chopper portion of the inverter circuit 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 are connected in counter-polarity to the polarized input capacity. The commutating capacitor is a lower impedence AC capacitor; and the transformer has an air gap in the core so as to preclude DC saturation, and has a primary winding designed to eliminate leakage flux by being either interleaved, or preferably, bifilar winding. The SCR's are direct-coupled to the primary winding.
335791
Hase Alfred M.
Hewson Donald E.
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