Two terminals quasi resonant tank circuit
First Claim
1. A power converter comprising:
- a transformer;
a resonant type circuit coupled to the transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a rectifier located near a secondary side of the transformer.
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Accused Products
Abstract
A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy source for a transformer resonance. The auxiliary switch effectively exchanges energy between the primary inductance of the transformer and the first and second resonant capacitors. The auxiliary switch effectively switches the transformer resonance between two distinct frequencies. In one embodiment of the invention, the power converter can be, but is not limited to, a flyback converter and further includes a comparator and a driver. The comparator is for detecting the voltage across the second resonance capacitor and the driver is configured to drive the auxiliary switch based on the output state of the comparator. The resonant nature of the converter provides zero voltage (ZVS) for the primary switch as well as for the auxiliary switch.
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Citations
69 Claims
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1. A power converter comprising:
a transformer;
a resonant type circuit coupled to the transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a rectifier located near a secondary side of the transformer.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power converter comprising:
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a transformer;
a resonant type circuit coupled to the transformer, the resonant type circuit comprising;
a first capacitor coupled to the transformer for operating at a first resonance frequency, and a second capacitor selectively coupled in parallel to the first capacitor for operating at a second resonance frequency.
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10. A power converter comprising:
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a transformer, a main switch, a first resonance capacitor coupled to the transformer to form a resonant circuit with the primary inductance of said transformer, a second resonance capacitor coupled to the transformer through an auxiliary switch to form a resonant circuit with the primary inductance of said transformer, a switching cycle comprising;
a first resonant cycle, and a second resonant cycle, wherein energy in the first resonant capacitor is substantially transferred to the second resonance capacitor through the first and second resonant cycles. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A power converter comprising:
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a transformer, a main switch, a first resonance capacitor coupled to the transformer to form a resonant circuit with the primary inductance of said transformer, a second resonance capacitor coupled to the transformer through an auxiliary switch to form a resonant circuit with the primary inductance of said transformer, a switching cycle comprising;
a first resonant cycle, and a second resonant cycle, wherein the auxiliary switch is driven from the resonant cycle. - View Dependent Claims (23, 24)
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25. A power converter comprising:
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a transformer;
a resonant type circuit coupled to the transformer, the resonant type circuit for providing a switching cycle for the transformer, the switching cycle comprising;
a first cycle; and
a second cycle, wherein the resonant circuit is configured to store and release electromagnetic energy from a set of parasitic and non parasitic components. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A quasi resonant type circuit comprising:
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an inductor;
a capacitor coupled to the inductor in an inductor-capacitor (LC) type arrangement;
a transistor coupled to the inductor-capacitor type arrangement, the transistor for providing a switching cycle;
wherein the circuit implements a quasi resonant storage tank for storing an electromagnetic energy by using a resonant current;
wherein the circuit is configured to receive the resonant current in a first cycle of operation, wherein the circuit is configured to release the stored energy in a second cycle of operation. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A circuit for the storage and retrieval of energy, the circuit comprising:
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a transformer having primary and secondary turns; and
a resonant tank comprising;
a bidirectional switch;
a current bias gate drive for the bidirectional switch; and
first and second terminal nodes;
wherein the resonant tank is coupled to the transformer at the first terminal node and the second terminal node. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69)
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Specification