Asymmetrical DC/DC converter having output current doubler
First Claim
Patent Images
1. A circuit for reducing a preload current required to maintain a duty cycle of an asymmetrical DC/DC converter, comprising:
- an auxiliary inductor, coupled in series with an output capacitor of said converter in an output current doubler thereof, said output current doubler having first and second main inductors, said auxiliarv inductor reducing ripple current in said output current doubler and thereby maintaining said duty cycle.
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Abstract
A circuit for, and method of, reducing a preload current required to maintain a duty cycle of an asymmetrical DC/DC converter and a DC/DC converter incorporating the circuit or the method. In one embodiment, the circuit includes an auxiliary inductor, coupled in series with an output capacitor of the converter in an output current doubler thereof, that reduces ripple current in the output current doubler and thereby maintains the duty cycle.
66 Citations
21 Claims
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1. A circuit for reducing a preload current required to maintain a duty cycle of an asymmetrical DC/DC converter, comprising:
an auxiliary inductor, coupled in series with an output capacitor of said converter in an output current doubler thereof, said output current doubler having first and second main inductors, said auxiliarv inductor reducing ripple current in said output current doubler and thereby maintaining said duty cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of reducing a preload current required to maintain a duty cycle of an asymmetrical DC/DC converter, comprising:
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reducing ripple current in an output current doubler, having first and second main inductors, with an auxiliary inductor coupled in series with an output capacitor of said converter; and maintaining said duty cycle. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An asymmetrical DC/DC converter, comprising:
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first and second power switches; an isolation transformer having a primary winding coupled to said first and second power switches; an output current doubler, having first and second main inductors coupled to a secondary winding of said isolation transformer; and an auxiliary inductor, coupled in series with an output capacitor of said converter in said output current doubler, that reduces ripple current in said output current doubler and thereby maintains said duty cycle. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification