Resonant power factor correction converter
First Claim
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1. 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, the resonant tank comprising a variable inductor coupled to a primary of the isolation transformer;
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 single-stage power-factor-correction resonant converter, thereby providing a single voltage output bus for the single-stage power-factor-correction resonant converter, and the variable inductor is configured to tune a resonant frequency of the resonant tank in response to the direct-current output voltage thereby regulating the direct-current output voltage.
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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.
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Citations
72 Claims
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1. A power converter comprising:
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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, the resonant tank comprising a variable inductor coupled to a primary of the isolation transformer; 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 single-stage power-factor-correction resonant converter, thereby providing a single voltage output bus for the single-stage power-factor-correction resonant converter, and the variable inductor is configured to tune a resonant frequency of the resonant tank in response to the direct-current output voltage thereby regulating the direct-current output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An AC-to-DC power converter comprising:
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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, the resonant tank having at least one variable inductor coupled to a primary of the isolation transformer, 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, and the variable inductor is configured to tune a resonant frequency of the resonant tank in response to the output DC voltage thereby regulating the output DC voltage, further wherein the output DC voltage is regulated to substantially the same voltage level whether the switchable bridge is operating as the half-bridge under high-line voltage conditions or as the full-bridge converter under low-line voltage conditions. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. An AC-to-DC power converter comprising:
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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, the resonant tank having at least one variable inductor coupled to a primary of the isolation transformer; 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 thereby reducing a peak current through the variable inductor; 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, and the variable inductor is configured to tune a resonant frequency of the resonant tank in response to the output DC voltage thereby regulating the output DC voltage. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. An AC-to-DC power converter comprising:
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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, the resonant tank having at least one variable inductor coupled to a primary of the isolation transformer, 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 and the variable inductor is configured to tune a resonant frequency of the resonant tank in response to the output DC voltage thereby regulating the output DC voltage, further wherein the output DC voltage is regulated to substantially the same voltage level whether the switchable bridge is operating as the half-bridge under high-line voltage conditions or as the full-bridge converter under low-line voltage conditions. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification