Sanken Electric Co., Ltd.

Keiichiro Ozawa

Akio Iwabuchi

Ryuichi Furukoshi

Yasushi Tasaka

A drive circuit drives a normally-on high-side switch Qand a normally-off low-side switch Qthat form a series circuit connected in parallel with a DC power source. The drive circuit includes a controllerthat outputs a control signal to turn on/off the high- and low-side switches, a rectifier Dhaving a first end connected to a connection point of the high- and low-side switches, a capacitor Cthat is connected to a second end of the rectifier and a first end of the DC power source and serves as a power source for the controller, and a driver (A, AND, Q, Q) that turns on/off the high- and low-side switches according to the control signal from the controller and a voltage from the capacitor.

Drive circuit

A gate driver of a switching element includes a first capacitor having a first end connected to a DC power source, a first switch having a first electrode connected to the first end of the first capacitor and a second electrode connected to a negative electrode of the DC power source, a second switch having a third electrode connected to the second electrode and the negative electrode of the DC power source and a fourth electrode connected to the first capacitor, a second capacitor connected in parallel with the third and fourth electrodes of the second switch and having a first end connected to the DC power source, and a negative voltage controller connecting the gate of the switching element to the second end of the first capacitor and a second end of the second capacitor when the switching element is turned off.

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Niiza, Japan

Keiichiro Ozawa