Method and apparatus for extending zero-voltage switching range in a DC to DC converter
First Claim
1. Apparatus for extending a zero voltage switching (ZVS) range during power conversion, comprising:
- a DC/DC converter, operated in a quasi-resonant mode, comprising;
a transformer;
a primary switch, coupled to a primary winding of the transformer, for controlling current flow through the primary winding; and
a component coupled to the transformer, wherein the component has a capacitance that varies with voltage across the component, and wherein during a downswing in voltage across the primary switch the component is passively tuned by a change in the voltage across the component that changes the capacitance of the component, and wherein the passive tuning of the component causes a resonant frequency of the DC/DC converter to change, and wherein the change in the resonant frequency causes the downswing to accelerate.
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Abstract
Method and apparatus for extending a zero voltage switching (ZVS) range during power conversion. In one embodiment, the apparatus comprises a DC/DC converter, operated in a quasi-resonant mode, comprising a transformer; a primary switch, coupled to a primary winding of the transformer, for controlling current flow through the primary winding; and a component coupled to the transformer, wherein the component has a capacitance that varies with voltage across the component, and wherein during a downswing in voltage across the primary switch the component is passively tuned by a change in the voltage across the component that changes the capacitance of the component, and wherein the passive tuning of the component causes a resonant frequency of the DC/DC converter to change, and wherein the change in the resonant frequency causes the downswing to accelerate.
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Citations
20 Claims
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1. Apparatus for extending a zero voltage switching (ZVS) range during power conversion, comprising:
a DC/DC converter, operated in a quasi-resonant mode, comprising; a transformer; a primary switch, coupled to a primary winding of the transformer, for controlling current flow through the primary winding; and a component coupled to the transformer, wherein the component has a capacitance that varies with voltage across the component, and wherein during a downswing in voltage across the primary switch the component is passively tuned by a change in the voltage across the component that changes the capacitance of the component, and wherein the passive tuning of the component causes a resonant frequency of the DC/DC converter to change, and wherein the change in the resonant frequency causes the downswing to accelerate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for extending a zero voltage switching (ZVS) range during power conversion, comprising:
a DC/DC converter for converting DC input power to DC output power, the DC/DC converter operated in a quasi-resonant mode and comprising; a transformer; a primary switch, coupled to a primary winding of the transformer, for controlling current flow through the primary winding; and a component coupled to the transformer, wherein the component has a capacitance that varies with voltage across the component, and wherein during a downswing in voltage across the primary switch the component is passively tuned by a change in the voltage across the component that changes the capacitance of the component, and wherein the passive tuning of the component causes a resonant frequency of the DC/DC converter to change, and wherein the change in the resonant frequency causes the downswing to accelerate; and a distributed generator (DG), coupled to the DC/DC converter, for providing the DC input power. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for extending a zero voltage switching (ZVS) range during power conversion, comprising:
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deactivating a primary switch of a DC/DC converter operating in quasi-resonant mode, the primary switch for controlling current flow through a primary winding of the DC/DC converter; increasing a resonant frequency of a resonant circuit of the DC/DC converter during a downswing in a voltage across the primary switch, wherein the resonant frequency is increased by passively tuning, during the downswing, a component coupled to a transformer of the DC/DC converter, wherein the component has a capacitance that varies with voltage across the component; and accelerating the downswing of the voltage across the primary switch as a result of increasing the resonant frequency by changing the voltage across the component to change the capacitance of the component. - View Dependent Claims (18, 19, 20)
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Specification