Turn-on/turn-off snubber for a metallic-oxide-semiconductor field-effect transistor (MOSFET) class-D power amplifier

摘要

The present invention is an H-bridge power amplifier circuit which includes diodes connected in parallel with MOSFET switch pairs of the circuit, each MOSFET switch pair including a MOSFET switch and a reverse-conduction blocking switch. Further, the circuit includes a snubber inductor which is connected to the switch pairs and the diodes. The circuit further includes a control branch/control sub-circuit having a snubber capacitor and a control MOSFET switch. The circuit is configured for: blocking MOSFET negative current to prevent body diode conduction; inhibiting/preventing turn-off losses of the MOSFETs; and reducing switching losses associated with operation into inductive mistuning.