Power converter with controller operable in selected modes of operation
First Claim
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1. A controller for use with a circuit having first and second switches operable in a mode of operation, configured to:
- alternately enable conduction of said first and second switches with primary and complementary duty cycles, respectively, in response to an output characteristic of said circuit during a switching cycle, said first switch configured to couple an output inductor to an input of said circuit and said second switch configured to couple said output inductor across output terminals of said circuit; and
disable conduction of said second switch when a current associated with said second switch is less than a current threshold level, said current threshold level being a fixed level selected to prevent reverse current flow in an inductor current through said output inductor and adjusted with a resistor divider network coupled to a positive bias voltage source and a negative bias voltage source, said current associated with said second switch being one of a second switch current and said inductor current through said output inductor of said circuit.
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Abstract
A power converter and method of controlling the same for selected modes of operation. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to control an operation of the first and second power switches during selected modes of operation.
333 Citations
18 Claims
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1. A controller for use with a circuit having first and second switches operable in a mode of operation, configured to:
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alternately enable conduction of said first and second switches with primary and complementary duty cycles, respectively, in response to an output characteristic of said circuit during a switching cycle, said first switch configured to couple an output inductor to an input of said circuit and said second switch configured to couple said output inductor across output terminals of said circuit; and disable conduction of said second switch when a current associated with said second switch is less than a current threshold level, said current threshold level being a fixed level selected to prevent reverse current flow in an inductor current through said output inductor and adjusted with a resistor divider network coupled to a positive bias voltage source and a negative bias voltage source, said current associated with said second switch being one of a second switch current and said inductor current through said output inductor of said circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for use with a circuit having first and second switches operable in a mode of operation, comprising:
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alternately enabling conduction of said first and second switches with primary and complementary duty cycles, respectively, in response to an output characteristic of said circuit during a switching cycle, said first switch configured to couple an output inductor to an input of said circuit and said second switch configured to couple said output inductor across output terminals of said circuit; and disabling conduction of said second switch when a current associated with said second switch is less than a current threshold level, said current threshold level being a fixed level selected to prevent reverse current flow in an inductor current through said output inductor and adjusted with a resistor divider network coupled to a positive bias voltage source and a negative bias voltage source, said current associated with said second switch being one of a second switch current and said inductor current through said output inductor of said circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification