Power converter with cascaded output transformers
AssigneeWavetek Corporation
InventorsKeith P. Bargroff, Howard S. Dawson
Life of this patent
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Abstract
In a power converter having a resonant output circuit transformer coupled to a load circuit, a transformer coupling circuit comprises at least two transformers providing a coupling stage having inductively coupled windings that are in step down relationship to an input and/or output winding of the transformer coupling circuit. This enables the rate of change of voltage in the coupling stage to be reduced and thus correspondingly reduces the transmission of interference from the power converter to the load circuit.
Claims9
In a power converter for transforming an input voltage o provide a D.C. voltage output and comprising transformer means having an input winding coupled to a voltage input circuit and an output winding coupled to a rectifier circuit for providing said D.C. voltage output, said voltage input circuit including a voltage switching means for switching an input voltage at a given frequency and a resonant circuit so coupled to said voltage switching means that operation thereof is effective to drive current pulses of approximately sinusoidal wave-form through the said input winding, the improvement wherein said transformer means comprises at least two transformers of which one provides said input finding and another provides said output winding, coupling between the input winding of the one transformer and the output winding of the other being provided via two further windings of said transformer means that are in step-down relationship to at least one of said input and output windings whereby the rate of charge of voltage in the said coupling connecting the input and output circuits of the converter is lower than occurs in at least one of said voltage input and output circuits.
Dependencies are inferred from the claim text.