Zero voltage soft switching scheme for power converters

摘要

A control scheme and architecture for a power conversion circuit employs two bidirectional switches and a zero voltage switching (ZVS) scheme for the high-side switch. Methods of incorporating the control scheme into multiple power conversion circuit topologies are disclosed. Methods of device integration including co-packaging and monolithic fabrication are also disclosed.

主权项

1. A power conversion circuit comprising: a voltage source having first and second output terminals; a first solid-state bidirectional switch having a pair of first power terminals and a first gate terminal, the pair of first power terminals connected between the first output terminal and a switch node; a first driver circuit transmitting a first gate drive signal to the first gate terminal in response to receiving a first gate control signal; a second solid-state bidirectional switch having a pair of second power terminals and a second gate terminal, the pair of second power terminals connected between the switch node and the second output terminal; an inductor connected between the switch node and the second output terminal; a second driver circuit transmitting a second gate drive signal to the second gate terminal in response to receiving a second gate control signal; a controller configured to: transmit the first gate control signal to create an oscillating voltage at the switch node; transmit the second gate control signal based on the oscillating voltage such that the second solid-state bidirectional switch turns on before the first solid-state bidirectional switch turns on, with a duration that is (1) less than a time that the first solid-state bidirectional switch is off and (2) of adequate time to reverse a direction of current flow within the inductor to generate a quantity of negative inductor current; and transmit the second gate control signal turning the second solid-state bidirectional switch off causing the quantity of negative current to (1) discharge an output capacitance of the first solid-state bidirectional switch and (2) discharge a capacitance of the switch node.