Soft switching active snubber for semiconductor circuit operated in discontinuous conduction mode
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United States of America Patent
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May 9, 1995
Grant Date -
N/A
app pub date -
Aug 20, 1993
filing date -
Aug 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A snubber network for a power conversion circuit operated in discontinuous conduction mode includes a snubber capacitor, an isolation diode and an active reset circuit. The snubber capacitor is connected to the output of the isolation diode, both of which are connected across a main switch of the power conversion circuit. The active reset circuit, connected between the input and output of the isolation diode as well as the input and output of a boost diode, is responsive to a reset signal for active resetting of the snubber capacitor within the normal boost cycle of the power conversion circuit. Upon receipt of the reset signal, energy held by the snubber capacitor is recovered by the reset circuit and subsequently transferred to the output of the power conversion circuit with turn-off of the main switch of the power conversion circuit. This occurs contemporaneous with the power conversion circuit's delivery of converted power to its output. With the snubber network, soft switching is provided for both the main switch and a snubber switch within the active reset circuit.
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