Patent ID: 9564485
Date: 2017-02-07
CPC Classifications: H01L,H02J,H02M,H02P

Claim:
1. A switch driving circuit which electrically opens and closes a switch circuit including two N-channel type semiconductor switching elements series connected in opposite directions, thereby electrically opening and closing an electrical path between a DC power supply and an inverter circuit, the switch driving circuit having a reference potential point in common with the inverter circuit and supplying an opening/closing control signal to the switch circuit, the switch driving circuit comprising: a half bridge circuit including two semiconductor switching elements series connected between a driving power supply and the reference potential point; two protection diodes connected in parallel to the semiconductor switching elements respectively; and two current blocking diodes connected between a signal output terminal of the half bridge circuit and one of the semiconductor switching elements at the reference potential side and between the signal output terminal of the half bridge circuit and one of the protection diodes connected in parallel to the one semiconductor switching element respectively.