Patent ID: 8350415

Claim:
A switch circuit comprising: an inductive load, a one end of the inductive load being connected to a one end of a DC power supply; a first switch connected in series with the inductive load, a one end of the first switch being connected to another end of the inductive load, another end of the first switch being connected to another end of the DC power supply; a capacitor connected in parallel with the first switch, a one end of the capacitor being connected to a node between the another end of the first switch and the another end of the DC power supply; a second switch connected in series with the capacitor, a one end of the second switch being connected to a node between the another end of the inductive load and the one end of the first switch, another end of the second switch being connected to another end of the capacitor; a third switch connected in parallel with the second switch, a one end of the third switch being connected to a node between the another end of the capacitor and the another end of the second switch, another end of the third switch being connected to a node between the one end of the inductive load and the one end of the DC power supply; and a control circuit that turns ON the second switch before the first switch is turned OFF and turns OFF the second switch before the first switch is turned ON after being turned OFF.