Constant frequency power converter
AssigneeMotorola, Inc.
InventorRonald G. Myers
Life of this patent
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Abstract
A constant frequency power converter which includes a system to switch a resonant capacitive or inductive element during the power transfer cycle in a clamped series resonant converter. A feedback control system generates a pulse width modulated signal to switch the resonant element at the appropriate time. A conventional power MOSFET can be used as the switching device. The resonant control elements may be operated in series or parallel depending on the basic resonant topology selected. Applications include high frequency power converters where small size is of prime concern.
Claims18
A constant frequency power converter comprising:
- first and second signal inputs;
- first and second signal outputs;
- a clamped series resonant converter (CSRC) connected separately to both the first and second signal inputs and both the first and second signal outputs;
- feedback control loop means coupled to the CSRC;
- and
- feedback isolator means coupled separately to the first and second signal outputs and to the feedback control loop means.
A method for the conversion of power at a constant frequency, comprised of the steps of:
- providing an input signal to first and second input terminals of a clamped series resonant converter (CSRC);
- increasing current in the CSRC resonant at a first resonant frequency;
- controlling the switching of at least one reactive element into the CSRC resonant circuit to provide a new resonant frequency for the CSRC;
- manipulating voltages across the at least one reactive element of the CSRC resonant circuit;
- eliminating the current in the CSRC resonant circuit;
- and
- outputting a constant frequency signal from the CSRC.
A feedback loop control system for use with a clamped series resonant converter (CSRC) at constant frequency, comprising:
- a pulse width modulator (PWM) coupled to the CSRC;
- switching means coupled to the PWM;
- a plurality of reactive means coupled to the CSRC and the switching means;
- and
- the switching means coupled to at least one of the reactive means.
Dependencies are inferred from the claim text.