Resonant power factor correction converter
AssigneeFlextronics AP, LLC
InventorsAaron Jungreis, Paul Garrity
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Abstract
An AC-to-DC power converter configured to provide power factor correction and a single isolated low-voltage output. The power converter includes a single-stage resonant power converter including an isolation transformer, a resonant tank, a rectifier, and a bulk storage capacitor coupled to an output of the isolation transformer. In typical applications, at least one non-isolated power converter is coupled to the output of the single-stage isolated power factor correction converter.
Claims79
A power converter comprising:
- a. a single-stage power-factor-correction resonant converter configured to receive an input voltage, wherein the single-stage power-factor-correction resonant converter includes an isolation transformer and a resonant tank;
- b. a rectifier coupled to an output of the isolation transformer;
- and
- c. a bulk capacitor coupled to an output of the rectifier, wherein a voltage across the bulk capacitor is a direct-current output voltage of the power converter.
An AC-to-DC power converter comprising:
- a. a bridge rectifier configured to receive an input AC voltage, wherein the bridge rectifier is configured to output a DC voltage corresponding to the input AC voltage;
- b. a single-stage power-factor-correction resonant converter coupled to the bridge rectifier to receive the DC voltage, wherein the single-stage power-factor-correction resonant converter includes an isolation transformer, a resonant tank, and a switchable bridge configured to operate as a half-bridge converter under high-line voltage conditions and to operate as a full-bridge converter under low-line voltage conditions;
- c. a rectifier coupled to an output of the isolation transformer;
- and
- d. a bulk capacitor coupled to an output of the rectifier, wherein a voltage across the bulk capacitor is an output DC voltage of the AC-to-DC power converter.
An AC-to-DC power converter comprising:
- a. a bridge rectifier configured to receive an input AC voltage, wherein the bridge rectifier is configured to output a DC voltage corresponding to the input AC voltage;
- b. a single-stage power-factor-correction resonant converter coupled to the bridge rectifier to receive the DC voltage, wherein the single-stage power-factor-correction resonant converter includes an isolation transformer and a resonant tank;
- c. a rectifier coupled to an output of the isolation transformer;
- d. a tap switch coupled to an output of the rectifier, wherein the tap switch is configured to increase and decrease a functional turns ratio of the isolation transformer;
- and
- e. a bulk capacitor coupled to the tap switch and to the output of the rectifier, wherein a voltage across the bulk capacitor is an output DC voltage of the AC-to-DC power converter.
An AC-to-DC power converter comprising:
- a. a bridge rectifier configured to receive an input AC voltage, wherein the bridge rectifier is configured to output a DC voltage corresponding to the input AC voltage;
- b. a single-stage power-factor-correction resonant converter coupled to the bridge rectifier to receive the DC voltage, wherein the single-stage power-factor-correction resonant converter includes an isolation transformer, a resonant tank, and a switchable bridge configured to operate as a half-bridge converter under high-line voltage conditions and to operate as a full-bridge converter under low-line voltage conditions;
- c. a rectifier coupled to an output of the isolation transformer;
- d. a tap switch coupled to an output of the rectifier, wherein the tap switch is configured to increase and decrease a functional turns ratio of the isolation transformer;
- and
- e. a bulk capacitor coupled to the tap switch and to the output of the rectifier, wherein a voltage across the bulk capacitor is an output DC voltage of the AC-to-DC power converter.
A power converter including a switchable bridge configured to convert a DC voltage to a high-frequency AC voltage, wherein the switchable bridge is further configured to operate as a full-bridge converter during a first voltage range of the DC voltage and to operate as a half-bridge converter during a second voltage range of the DC voltage.
Dependencies are inferred from the claim text.