Controller for a synchronous rectifier switch
First Claim
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1. A controller employable with a bridge rectifier having first and second synchronous rectifier switches, comprising:
- an amplifier configured to enable a turn-on delay with a plurality of series-coupled diodes for said first synchronous rectifier switch;
a discharge switch having a control terminal coupled to an output of said amplifier via a charge switch, and first and second switched terminals coupled to gate and source terminals, respectively, of said first synchronous rectifier switch and configured to discharge a gate-to-source capacitance of said first synchronous rectifier switch to enable a turn off thereof; and
a mutual lock circuit including a first lock switch and a second lock switch coupled to said gate terminal of said first synchronous rectifier switch and a gate terminal of said second synchronous rectifier switch, respectively, wherein a switched terminal of said first lock switch is cross-coupled to a control terminal of said second lock switch, a switched terminal of said second lock switch is cross-coupled to a control terminal of said first lock switch, and said first lock switch is parallel-coupled to said discharge switch.
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Abstract
A controller for a power converter and method of operating the same employable with a bridge rectifier having first and second synchronous rectifier switches. In one embodiment, the controller includes an amplifier configured to enable a turn-on delay for the first synchronous rectifier switch. The controller also includes a discharge switch having first and second switched terminals coupled to gate and source terminals, respectively, of the first synchronous rectifier switch and configured to discharge a gate-to-source capacitance of the first synchronous rectifier switch to enable a turn off thereof.
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Citations
20 Claims
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1. A controller employable with a bridge rectifier having first and second synchronous rectifier switches, comprising:
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an amplifier configured to enable a turn-on delay with a plurality of series-coupled diodes for said first synchronous rectifier switch; a discharge switch having a control terminal coupled to an output of said amplifier via a charge switch, and first and second switched terminals coupled to gate and source terminals, respectively, of said first synchronous rectifier switch and configured to discharge a gate-to-source capacitance of said first synchronous rectifier switch to enable a turn off thereof; and a mutual lock circuit including a first lock switch and a second lock switch coupled to said gate terminal of said first synchronous rectifier switch and a gate terminal of said second synchronous rectifier switch, respectively, wherein a switched terminal of said first lock switch is cross-coupled to a control terminal of said second lock switch, a switched terminal of said second lock switch is cross-coupled to a control terminal of said first lock switch, and said first lock switch is parallel-coupled to said discharge switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a controller employable with a bridge rectifier having first and second synchronous rectifier switches, comprising:
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enabling a turn-on delay for said first synchronous rectifier switch with a plurality of series-coupled diodes of an amplifier; discharging a gate-to-source capacitance of said first synchronous rectifier switch with a discharge switch having a control terminal coupled to an output of said amplifier via a charge switch, and first and second switched terminals coupled to gate and source terminals, respectively, of said first synchronous rectifier switch to enable a turn off of said first synchronous rectifier switch; and reducing cross conduction between said first and second synchronous rectifier switches with a mutual lock circuit including a first lock switch and a second lock switch coupled to said gate terminal of said first synchronous rectifier switch and a gate terminal of said second synchronous rectifier switch, respectively, wherein a switched terminal of said first lock switch is cross-coupled to a control terminal of said second lock switch, a switched terminal of said second lock switch is cross-coupled to a control terminal of said first lock switch, and said first lock switch is parallel-coupled to said discharge switch. - View Dependent Claims (12, 13, 14)
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15. A power converter, comprising:
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a bridge rectifier having first and second synchronous rectifier switches; and a controller, including; an amplifier configured to enable a turn-on delay with a plurality of series-coupled diodes for said first synchronous rectifier switch, a discharge switch having a control terminal coupled to an output of said amplifier via a charge switch, and first and second switched terminals coupled to gate and source terminals, respectively, of said first synchronous rectifier switch and configured to discharge a gate-to-source capacitance of said first synchronous rectifier switch to enable a turn off thereof, and a mutual lock circuit including a first lock switch and a second lock switch coupled to said gate terminal of said first synchronous rectifier switch and a gate terminal of said second synchronous rectifier switch, respectively, wherein a switched terminal of said first lock switch is cross-coupled to a control terminal of said second lock switch, a switched terminal of said second lock switch is cross-coupled to a control terminal of said first lock switch, and said first lock switch is parallel-coupled to said discharge switch. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification