RESONANT CONVERTERS INCLUDING FLYING CAPACITORS
First Claim
1. A zero-voltage transition PWM resonant converter comprising:
- a DC bus including a first rail and a second rail;
a first switching device coupled with the first rail and a converter output node;
a second switching device coupled with the second rail and the converter output node;
a resonant tank circuit comprising a first resonant capacitor coupled in parallel with the first switching device, a second resonant capacitor coupled in parallel with the second switching device, and a resonant inductor coupled with the converter output node;
an auxiliary circuit including a plurality of auxiliary switching devices coupled in series between the first rail and the second rail and a flying capacitor coupled in parallel across two of the auxiliary switching devices, the resonant inductor being coupled to a node intermediate the said two of the auxiliary switching devices; and
a controller structured to control the first switching device, the second switching device, and the plurality of auxiliary switching devices to provide resonant operation of the tank circuit effective to provide a substantially zero voltage condition across the first switching device when turning the first switching device on or off and to provide a substantially zero voltage condition across the second switching device when turning the second switching device on or off,wherein after all of the plurality of switching devices are opened, current no longer flows through the resonant inductor.
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Accused Products
Abstract
Unique systems, methods, techniques and apparatuses of zero-voltage transition pulse width modulation resonant converters are disclosed. One exemplary embodiment is a zero-voltage transition PWM resonant converter comprising a DC bus, a first switching device, a second switching device, a resonant tank circuit, an auxiliary circuit having a flying capacitor and a plurality of auxiliary switching devices, and a controller. The controller is structured to control the first switching device, the second switching device, and the plurality of auxiliary switching devices to provide resonant operation of the tank circuit effective to provide a substantially zero voltage condition across the first switching device when turning the first switching device on or off and to provide a substantially zero voltage condition across the second switching device when turning the second switching device on or off.
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Citations
20 Claims
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1. A zero-voltage transition PWM resonant converter comprising:
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a DC bus including a first rail and a second rail; a first switching device coupled with the first rail and a converter output node; a second switching device coupled with the second rail and the converter output node; a resonant tank circuit comprising a first resonant capacitor coupled in parallel with the first switching device, a second resonant capacitor coupled in parallel with the second switching device, and a resonant inductor coupled with the converter output node; an auxiliary circuit including a plurality of auxiliary switching devices coupled in series between the first rail and the second rail and a flying capacitor coupled in parallel across two of the auxiliary switching devices, the resonant inductor being coupled to a node intermediate the said two of the auxiliary switching devices; and a controller structured to control the first switching device, the second switching device, and the plurality of auxiliary switching devices to provide resonant operation of the tank circuit effective to provide a substantially zero voltage condition across the first switching device when turning the first switching device on or off and to provide a substantially zero voltage condition across the second switching device when turning the second switching device on or off, wherein after all of the plurality of switching devices are opened, current no longer flows through the resonant inductor. - View Dependent Claims (2, 3, 4, 5)
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6. A zero-voltage transition converter coupled to a direct current (DC) power source having a positive pole and a negative pole, the converter comprising:
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a first primary switching device having a first terminal electrically coupled to the positive pole of the DC power source, and a second terminal electrically coupled to a load; a second primary switching device having a first terminal electrically coupled to the load and a second terminal coupled to the negative pole of the DC power source; a first resonant capacitor coupled in parallel to the first primary switching device; a second resonant capacitor coupled in parallel to the second primary switching device; a flying capacitor (FC) circuit electrically coupled to the power source and the load, the FC circuit comprising at least one flying capacitor and at least four FC switching devices; a resonant inductor electrically coupled with the first primary switch, second primary switch, the load and the FC circuit; and a controller structured to operate the first primary switching device and the second primary switching device by opening and closing the first primary switching device and the second primary switching device so as to convert DC power from the DC power source into output power and transmit the output power to the load, wherein the controller is structured to operate the FC switching devices so as to generate substantially zero voltage switching conditions across the first primary switching device and the second primary switching device during the opening and closing of the first primary switching device and the second primary switching device, wherein the FC circuit and resonant tank are structured to allow no current to pass through the resonant inductor after opening one of the FC switching devices, and wherein the controller is structured to generate a resonating current by operating the FC switching devices such that a current flows through the resonant inductor. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for generating an output power by operating a pulse width modulation converter coupled to a DC power source comprising:
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operating circuitry including a flying capacitor circuit having a flying capacitor and a plurality of semiconductor switches coupled in parallel with the DC power source, a pair of primary semiconductor switches coupled in parallel with the DC power source, a resonant tank circuit having a resonant inductor and two resonant capacitors, the resonant tank circuit coupled with the flying capacitor circuit, the pair of primary switches, and a load; generating a resonating current in the resonant tank by operating the flying capacitor circuit such that the voltage across one of the primary semiconductor switches is a substantially zero voltage condition; opening one switch of the primary semiconductor switches; closing the other of the pair of primary semiconductor switches in a substantially zero voltage condition; and reducing the current in the resonant inductor by generating a midpoint voltage with the flying capacitor circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification