Current-fed dc/dc converter with multilevel transformer and method of operation thereof
First Claim
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1. For use with a current-fed power converter having an input inductor and a power switch adapted to transfer power to a transformer, a regulation circuit, comprising:
- a switching network, coupled to a tapped winding of said transformer, operable to vary a turns ratio of said transformer as a function of a voltage at a node between said input inductor and said transformer thereby regulating an output voltage of said power converter.
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Abstract
A regulation circuit for a current-fed power converter having a power switch adapted to transfer power to a transformer. In one embodiment, the regulation circuit includes a switching network coupled to a tapped winding of the transformer and operable to vary a turns ratio of the transformer thereby regulating an output voltage of the power converter.
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Citations
21 Claims
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1. For use with a current-fed power converter having an input inductor and a power switch adapted to transfer power to a transformer, a regulation circuit, comprising:
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a switching network, coupled to a tapped winding of said transformer, operable to vary a turns ratio of said transformer as a function of a voltage at a node between said input inductor and said transformer thereby regulating an output voltage of said power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
a metal oxide semiconductor field-effect transistor;
a bipolar junction transistor;
an insulated gate bipolar transistors; and
a gate turn-off thyristor.
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3. The regulation circuit as recited in claim 1 wherein said switching network comprises a diode coupled to said tapped winding.
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4. The regulation circuit as recited in claim 1 wherein said power converter further has a rectifier coupled to said tapped winding, said switching network comprising:
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first and second diodes coupled to opposing ends of said tapped winding; and
a regulation switch coupled between said first and second diodes and an output of said power converter.
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5. The regulation circuit as recited in claim 1 wherein said tapped winding is a first tapped primary winding, said transformer having a second tapped primary winding, said switching network comprising:
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a diode and a regulation switch coupled to said first tapped primary winding; and
a second diode coupled to said second tapped primary winding.
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6. The regulation circuit as recited in claim 1 wherein said power converter is a boost power converter.
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7. The regulation circuit as recited in claim 1 wherein said power converter further has a second power switch, said power switch and said second power switch operable in an interleaved manner.
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8. For use with a current-fed power converter having an input inductor and a power switch adapted to transfer power to a transformer, a method of regulating said power converter, comprising:
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operating a switching network, coupled to a tapped winding of said transformer, to vary a turns ratio of said transformer as a function of a voltage at a node between said input inductor and said transformer thereby regulating an output voltage of said power converter. - View Dependent Claims (9, 10, 11, 12, 13, 14)
a metal oxide semiconductor field-effect transistor;
a bipolar junction transistor;
an insulated gate bipolar transistors; and
a gate turn-off thyristor.
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10. The method as recited in claim 8 wherein said switching network comprises a diode coupled to said tapped winding.
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11. The method as recited in claim 8 wherein said power converter further has a rectifier coupled to said tapped winding, said switching network comprising:
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first and second diodes coupled to opposing ends of said tapped winding; and
a regulation switch coupled between said first and second diodes and an output of said power converter.
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12. The method as recited in claim 8 wherein said tapped winding is a first tapped primary winding, said transformer having a second tapped primary winding, said switching network comprising:
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a diode and a regulation switch coupled to said first tapped primary winding; and
a second diode coupled to said second tapped primary winding.
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13. The method as recited in claim 8 wherein said power converter is boost power converter.
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14. The method as recited in claim 8 wherein said power converter further has a second power switch, said power switch and said second power switch operable in an interleaved manner.
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15. A current-fed power converter, comprising:
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an input inductor coupled to an input of said power converter;
a transformer having a tapped winding;
a power switch adapted to transfer power from said input via said input inductor to said transformer;
a regulation circuit, including;
a switching network, coupled to said tapped winding, operable to vary a turns ratio of said transformer as a function of a voltage at a node between said input inductor and said transformer thereby regulating an output voltage of said power converter. - View Dependent Claims (16, 17, 18, 19, 20, 21)
a metal oxide semiconductor field-effect transistor;
a bipolar junction transistor;
an insulated gate bipolar transistors; and
a gate turn-off thyristor.
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17. The power converter as recited in claim 15 wherein said switching network comprises a diode coupled to said tapped winding.
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18. The power converter as recited in claim 15 further comprising a rectifier coupled to said tapped winding, said switching network comprising:
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first and second diodes coupled to opposing ends of said tapped winding; and
a regulation switch coupled between said first and second diodes and an output of said power converter.
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19. The power converter as recited in claim 15 wherein said tapped winding is a first tapped primary winding, said transformer further having a second tapped primary winding, said switching network comprising:
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a diode and a regulation switch coupled to said first tapped primary winding; and
a second diode coupled to said second tapped primary winding.
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20. The power converter as recited in claim 15 wherein said power converter is a boost power converter.
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21. The power converter as recited in claim 15 further comprising a second power switch, said power switch and said second power switch operable in an interleaved manner.
Specification