Inverter circuits

Details Inverter circuits Inverter circuits

1979-09-19

1981-06-16

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363136, H02M 7515

Patent

active

042741378

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 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 impedance 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.

REFERENCES:
patent: 3931565 (1976-01-01), Hase
patent: 3973165 (1976-08-01), Hester

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