Single stage boost-asymmetric LLC
First Claim
1. A power converter comprising:
- a full bridge rectifier configured to receive an alternating current (AC) input for conversion into a rectified direct current (DC) output;
a transformer comprising a primary winding and a secondary winding, wherein a first primary terminal of the primary winding is connected to the full bridge rectifier;
a resonant inductor connected to a second primary terminal of the primary winding;
a storage capacitor and a pair of parallel switches that are disposed on a primary winding side of the transformer such that a current from the full bridge rectifier flows through the primary winding, then the resonant inductor, before flowing through the pair of parallel switches;
a pair of diodes connected to a first secondary terminal of the secondary winding; and
a pair of resonant capacitors connected to a second secondary terminal of the secondary winding.
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Accused Products
Abstract
An AC/DC power converter utilizing a single stage boost-asymmetric LLC topology is disclosed. The converter uses a combined pulse width modulation (PWM) and frequency modulation (FM) to achieve dual control for a single main magnetic element (transformer). The transformer provides an output voltage regulation throughout the primary-secondary isolation operating in resonant mode (LLC) by means of frequency modulation, while at the same time its magnetizing inductance is conditioning the input current and providing a boosted high voltage for energy storage purpose by means of duty cycle control. A single pair of complementary primary switches is used to drive the primary winding of the transformer in order to achieve both voltage regulation and power conditioning. The secondary side capacitors and the resonant inductor, which may be either integrated into the transformer or external to the transformer, achieve the resonant function of the transformer.
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Citations
20 Claims
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1. A power converter comprising:
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a full bridge rectifier configured to receive an alternating current (AC) input for conversion into a rectified direct current (DC) output; a transformer comprising a primary winding and a secondary winding, wherein a first primary terminal of the primary winding is connected to the full bridge rectifier; a resonant inductor connected to a second primary terminal of the primary winding; a storage capacitor and a pair of parallel switches that are disposed on a primary winding side of the transformer such that a current from the full bridge rectifier flows through the primary winding, then the resonant inductor, before flowing through the pair of parallel switches; a pair of diodes connected to a first secondary terminal of the secondary winding; and a pair of resonant capacitors connected to a second secondary terminal of the secondary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a power converter that includes a full bridge rectifier, a pair of parallel switches, and a transformer, the method comprising:
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converting, using the full bridge rectifier, an external alternating current (AC) power into a rectified direct current (DC) power; converting, using the pair of parallel switches, the rectified DC power into an internal DC power by switching the pair of parallel switches; and converting the internal DC power into an output DC power using power conditioning and voltage regulation, wherein the power conditioning is performed by an inductance of the transformer and a resonant inductor that is connected to a primary side of the transformer such that a current from the full bridge rectifier flows through a primary winding of the transformer, then the resonant inductor, before flowing through the pair of parallel switches, and wherein the voltage regulation is performed by resonant capacitors on a secondary winding side of the transformer, the resonant capacitors configured to resonate with the resonant inductor. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A power converter comprising:
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a full bridge rectifier configured to convert an alternating current (AC) input to a direct current (DC) output, and provide the DC output to a primary side of a transformer of the power converter; and a resonant tank comprising (i) a resonant inductor connected to the primary side of the transformer and (ii) resonant capacitors connected on a secondary side of the transformer, wherein the resonant capacitors resonate with the resonant inductor in response to a switching operation of parallel switches connected at the primary side of the transformer such that a current from the full bridge rectifier flows through a primary winding of the transformer, then the resonant inductor, before flowing through the parallel switches. - View Dependent Claims (18, 19, 20)
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Specification