Method and apparatus for protecting parts in case of overvoltage and undervoltage

Abstract

An embodiment circuit includes a load circuit including a first insulated gate bipolar transistor (IGBT), a second IGBT, and a component, a first end of the component being connected to the first IGBT and a second end of the component being connected to the second IGBT, a first circuit including a first capacitor and a relay switch which are connected in series, and a second circuit including a second capacitor and a third capacitor, wherein the second capacitor and the third capacitor are connected in series, wherein the load circuit, the first circuit, and the second circuit are connected in parallel, and wherein the relay switch is open or closed based on a magnitude of an output voltage of the component.