Resonant power converter with switchable reflected output voltage
First Claim
1. A power converter comprising:
- a generator configured to generate a sequence of output voltage waveforms;
a first switching transistor and a second switching transistor connected to the generator and configured to control a duty cycle of the output voltage waveforms;
an input voltage line connected to the first switching transistor;
a resonant tank connected to the generator comprising at least one capacitor and at least one inductor;
a transformer including a primary side connected in series with the at least one inductor, wherein the primary side is configured to use at least one primary winding tap and a secondary side for connecting to a rectifying circuit for providing a rectified DC voltage to an output load circuit; and
a first switch and a second switch on the primary side connected to the at least one primary winding tap, wherein the at least one primary winding tap is selected by the first switch or the second switch to select a reflected output voltage by closing the first switch or the second switch; and
a plurality of clamping diodes connected between the first switch and the second switch and the input line and configured to limit voltage across the first switch or the second switch.
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Accused Products
Abstract
Disclosed is a power converter including a generator configured to generate a sequence of output voltage waveforms, a resonant tank connected to the generator comprising at least one capacitor and at least one inductor, a transformer including a primary side connected in series with said series inductor and, the primary side being configurable to use at least one primary winding tap and a secondary side for connecting to a rectifying circuit for providing a rectified DC voltage to an output load circuit, a first switch and a second switch on the primary side connected to the primary winding, wherein the at least one primary winding is selected by the first switch or the second switch to select a different reflected output voltage by closing the first switch or the second switch.
25 Citations
20 Claims
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1. A power converter comprising:
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a generator configured to generate a sequence of output voltage waveforms; a first switching transistor and a second switching transistor connected to the generator and configured to control a duty cycle of the output voltage waveforms; an input voltage line connected to the first switching transistor; a resonant tank connected to the generator comprising at least one capacitor and at least one inductor; a transformer including a primary side connected in series with the at least one inductor, wherein the primary side is configured to use at least one primary winding tap and a secondary side for connecting to a rectifying circuit for providing a rectified DC voltage to an output load circuit; and a first switch and a second switch on the primary side connected to the at least one primary winding tap, wherein the at least one primary winding tap is selected by the first switch or the second switch to select a reflected output voltage by closing the first switch or the second switch; and a plurality of clamping diodes connected between the first switch and the second switch and the input line and configured to limit voltage across the first switch or the second switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a power converter including a generator, at least one capacitor and at least one inductor, a transformer including a primary side and a secondary side, the primary side connected in series with the inductor, and a plurality of switches on the primary side and connected to a primary winding, the method comprising:
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operating the plurality of switches on a primary side of the transformer to form a resonant tank circuit including a plurality of taps; selecting at least one of the plurality of taps to vary an output voltage of the power converter; and delivering energy to a load via a rectifier during a time period, wherein an operating frequency of the generator is chosen such that the end of the time period is close to a point where the rectifier stops conducting, and wherein the time period is slightly shorter than half a period of a resonance frequency of the power converter as set by the at least one inductor and at least one capacitor. - View Dependent Claims (18, 19)
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20. A power converter comprising:
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a generator configured to generate a sequence of output voltage waveforms; a resonant tank connected to the generator comprising at least one capacitor and at least one inductor; a transformer including a primary side connected in series with said series inductor, wherein the primary side is configured to use at least one primary winding tap and a secondary side for connecting to a rectifying circuit including a rectifier diode for providing a rectified DC voltage to an output load circuit; and a first switch and a second switch on the primary side connected to the primary winding, wherein the at least one primary winding is selected by the first switch or the second switch to select a different reflected output voltage by closing the first switch or the second switch, wherein energy is delivered to the load via the rectifier during a time period, wherein an operating frequency of the generator is chosen such that the end of the time period is close to a point where the rectifier stops conducting, and wherein the time period is slightly shorter than half a period of a resonance frequency of the power converter as set by the at least one inductor and at least one capacitor.
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Specification