Voltage-mode quasi-resonant dc/dc converter
First Claim
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1. A voltage-mode quasi-resonant converter which supplies DC power to a load, comprising:
- a resonant inductor;
a resonant capacitor connected in series with the resonant inductor;
a switching circuit connected in parallel to the resonant capacitor;
a DC power source coupled to the resonant capacitor;
an input inductor coupled to the DC power source, which stores current energy from the DC power source during an on-time of the switching circuit and supplies stored current energy to the resonant capacitor and the resonant inductor during an off-time of the switching circuit; and
a diode coupled to the DC power source, which supplies DC power from the resonant capacitor and the resonant inductor to the load, wherein said switching circuit comprises first and second MOSFET switches having respective first and second parasitic diodes, said first and second MOSFET switches being serially connected so that first and second anodes of respective first and second parasitic diodes are connected.
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Abstract
A voltage-mode quasi-resonant dc/dc converter which operates in full-wave mode at high switching frequencies is disclosed. The ideal switch for the voltage-mode quasi-resonant converter is implemented by a pair of MOSFET switches serially connected to each other so that their parasitic diodes are opposite to each other. This construction enables a charge on the parasitic capacitances of the MOSFETs to be released, and heat loss to be reduced, so that a full-wave mode operation at high switching frequencies can be realized.
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Citations
13 Claims
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1. A voltage-mode quasi-resonant converter which supplies DC power to a load, comprising:
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a resonant inductor; a resonant capacitor connected in series with the resonant inductor; a switching circuit connected in parallel to the resonant capacitor; a DC power source coupled to the resonant capacitor; an input inductor coupled to the DC power source, which stores current energy from the DC power source during an on-time of the switching circuit and supplies stored current energy to the resonant capacitor and the resonant inductor during an off-time of the switching circuit; and a diode coupled to the DC power source, which supplies DC power from the resonant capacitor and the resonant inductor to the load, wherein said switching circuit comprises first and second MOSFET switches having respective first and second parasitic diodes, said first and second MOSFET switches being serially connected so that first and second anodes of respective first and second parasitic diodes are connected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for use in a voltage-mode quasi-resonant converter, comprising:
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an inductor; a first MOSFET switch connected in series with said inductor; a second MOSFET switch connected in series with said first MOSFET switch so that first and second anodes of respective first and second parasitic diodes of respective first and second MOSFET switches are connected, said inductor, said first MOSFET switch and said second MOSFET switch being for use in the voltage-mode quasi-resonant converter. - View Dependent Claims (11, 12, 13)
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Specification