Inverter circuit with current equalization
AssigneeThe United States of America as represented by the Secretary of the Army
InventorSamuel Levinson
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Abstract
The unbalance in currents flowing alternately in the two halves of a doubended, push-pull inverter is obviated by means of a parallel resonant network, comprised of an inductor and capacitor, placed in series with the power supply voltage applied to the center tap of the inverter transformer primary winding. The network component values are selected to provide relatively a high impedance of the inverter fundamental operating frequency while providing a low impedance at twice the fundamental operating frequency.
Claims10
Circuit means for equalizing the respective currents flowing alternately in two halves of a double-ended, push-pull DC to DC inverter, comprising in combination:
- an inverter transformer having a primary winding including a center tap and a secondary winding;
- means for receiving a DC supply potential;
- a pair of switching devices respectively coupled to opposite ends of said primary winding;
- control circuit means generating periodic signals of a predetermined fundamental operating frequency coupled to said switching devices for rendering said devices alternately conducting and non conducting in a mutually opposite sense;
- and
- a parallel resonant network coupled between said center tap of the primary winding and said means for receiving the DC supply potential, said resonant network having a resonant frequency substantially equal to said fundamental operating frequency and being operable thereby to produce balanced currents in said pair of switching devices and accordingly the primary winding of said inverter transformer.
Dependencies are inferred from the claim text.