Circuit for moderating a peak reverse recovery current of a rectifier and method of operation thereof
First Claim
1. In a power converter having a power train that includes a power switch and a rectifier for conducting forward currents from said power switch, a circuit that moderates a peak reverse recovery current of said rectifier, comprising:
- a snubber circuit coupled to said rectifier and including a snubber inductor, a snubber capacitor and an auxiliary diode, said snubber inductor reducing said peak reverse recovery current of said rectifier and said snubber capacitor recovering energy stored in said snubber inductor; and
an auxiliary switch, coupled in parallel with said power switch, that is activated when said power switch is transitioned from a conducting state to a non-conducting state to charge said snubber capacitor.
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Accused Products
Abstract
In a power converter having a power train that includes a power switch and a rectifier for conducting forward currents from the power switch, a circuit for, and method of, moderating a peak reverse recovery current of the rectifier and a power converter employing the circuit or the method. The circuit includes: (1) a snubber circuit coupled to the rectifier and including a snubber inductor, a snubber capacitor and an auxiliary diode, the snubber inductor reducing the peak reverse recovery current of the rectifier and the snubber capacitor recovering energy stored in the snubber inductor and (2) an auxiliary switch, coupled in parallel with the power switch, that is activated when the power switch is transitioned from a conducting state to a non-conducting state to charge the snubber capacitor.
57 Citations
20 Claims
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1. In a power converter having a power train that includes a power switch and a rectifier for conducting forward currents from said power switch, a circuit that moderates a peak reverse recovery current of said rectifier, comprising:
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a snubber circuit coupled to said rectifier and including a snubber inductor, a snubber capacitor and an auxiliary diode, said snubber inductor reducing said peak reverse recovery current of said rectifier and said snubber capacitor recovering energy stored in said snubber inductor; and an auxiliary switch, coupled in parallel with said power switch, that is activated when said power switch is transitioned from a conducting state to a non-conducting state to charge said snubber capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a power converter having a power train that includes a power switch and a rectifier for conducting forward currents from said power switch, a method of moderating a peak reverse recovery current of said rectifier, comprising the steps of:
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reducing said peak reverse recovery current of said rectifier with a snubber inductor; recovering energy stored in said snubber inductor with a snubber capacitor; and activating an auxiliary switch coupled in parallel with said power switch when said power switch is transitioned from a conducting state to a non-conducting state to charge said snubber capacitor. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power supply, comprising:
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an input source of electrical power; a power converter, coupled between said input source and an output, including; a power switch, and a power diode for conducting forward currents from said power switch; and a circuit for moderating a peak reverse recovery current of said power diode, including; a snubber circuit coupled to said power diode and including a snubber inductor, a snubber capacitor and an auxiliary diode, said snubber inductor reducing said peak reverse recovery current of said power diode and said snubber capacitor recovering energy stored in said snubber inductor; and an auxiliary switch, coupled in parallel with said power switch, that is activated when said power switch is transitioned from a conducting state to a non-conducting state to charge said snubber capacitor. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification