Patent ID: 8638134
Filing Date: 2014-01-28
Classification: H01L,H02M,H03K

Abstract:
1. A gate drive circuit in a power conversion circuit, the gate drive circuit comprising: two switching elements connected in series, wherein one of the switching elements having a higher electric potential with respect to a connection point is used as a high-side switching element, a low-side switching element having a lower electric potential with respect to the connection point is used as a low-side switching element, the high-side and low-side gate drive circuits being controlled such that the high-side gate drive circuit maintains 0 V or outputs a negative voltage when the low-side gate drive circuit outputs a positive voltage, and the high-side gate drive circuit outputs a positive voltage when the low-side gate drive circuit outputs 0 V or a negative voltage, and a primary side of a transformer is connected to an output terminal of the low-side gate drive circuit, and a secondary side of the transformer is connected across a gate/source of the high-side switching element to generate a voltage of a polarity opposite to that of primary side of the transformer, wherein the transformer is an air-core transformer.