Adjustable resonant apparatus for power converters
First Claim
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1. An apparatus comprising:
- a first series resonant inductor coupled to a switching network and a transformer;
a first series resonant capacitor coupled to the switching network and the transformer;
a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor;
a resonant frequency adjusting device coupled to the switching network and the transformer; and
a switch connected in series with the resonant frequency adjusting device, wherein the switch is formed by two back-to-back connected transistors, and wherein the switch has a first terminal directly connected with the resonant frequency adjusting device and a second terminal directly connected with the switching network, and wherein the switch comprises a first transistor and a second transistor that are turned off when a load of the apparatus is greater than a predetermined threshold and turned on when the load of the apparatus is less than the predetermined threshold.
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Abstract
An apparatus comprises a first series resonant inductor coupled to a switching network and a transformer, a first series resonant capacitor coupled to the switching network and the transformer, a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor, a resonant frequency adjusting device coupled to the switching network and the transformer and a switch connected in series with the resonant frequency adjusting device.
5 Citations
18 Claims
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1. An apparatus comprising:
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a first series resonant inductor coupled to a switching network and a transformer; a first series resonant capacitor coupled to the switching network and the transformer; a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor; a resonant frequency adjusting device coupled to the switching network and the transformer; and a switch connected in series with the resonant frequency adjusting device, wherein the switch is formed by two back-to-back connected transistors, and wherein the switch has a first terminal directly connected with the resonant frequency adjusting device and a second terminal directly connected with the switching network, and wherein the switch comprises a first transistor and a second transistor that are turned off when a load of the apparatus is greater than a predetermined threshold and turned on when the load of the apparatus is less than the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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an input power source; a switching network comprising; a first pair of switches coupled between the input power source; and a second pair of switches coupled between the input power source; a resonant tank connected between the switching network and a primary side of a transformer, wherein the resonant tank comprises; a first series resonant inductor coupled to the switching network and the transformer; a first series resonant capacitor coupled to the switching network and the transformer; a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor; a resonant frequency adjusting device coupled to the switching network and the transformer; and a switch connected in series with the resonant frequency adjusting device, wherein the switch has a first terminal directly connected with the resonant frequency adjusting device and a second terminal directly connected with a common node of the switches of the switching network, and wherein the switch comprises a first transistor and a second transistor back-to-back connected, and wherein the first transistor and the second transistor are configured such that; both the first transistor and the second transistor are turned off when a load of the system is greater than a predetermined threshold; and at least one transistor of the first transistor and the second transistor is turned on when the load of the system is less than the predetermined threshold; a rectifier coupled to a secondary side of the transformer; and an output filter coupled to the rectifier. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method comprising:
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providing a resonant tank coupled between a switching network and a transformer, wherein the resonant tank comprises; a first series resonant inductor coupled to a switching network and the transformer; a first series resonant capacitor coupled to the switching network and the transformer; a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor; a resonant frequency adjusting device coupled to the switching network and the transformer; and a switch connected in series with the resonant frequency adjusting device, wherein the switch comprises a first transistor and a second transistor back-to-back connected in series; in response to a load increase, turning off both the first transistor and the second transistor and configuring the switching network to operate at a first switching frequency approximately equal to a first resonant frequency; and in response to a load drop, turning on the first transistor, keeping the second transistor off and configuring the switching network to operate at a second switching frequency approximately equal to a second resonant frequency. - View Dependent Claims (15, 16, 17, 18)
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Specification