Patent ID: 8487667

Claim:
A hybrid power device comprising: a hybrid power FET formed of a normally-on type SiC-JFET and a normally-off type Si-MOSFET, which are cascode-connected with a source of the SiC-JFET and a drain of the Si-MOSFET being connected to each other; and a control circuit part connected to a gate of the SiC-JFET for varying a gate current and a gate voltage of the SiC-JFET in a switching period of the hybrid power FET thereby to control a switching speed of the hybrid power FET to first switching speed in a former part of the switching period and to a second switching speed lower than the first switching speed in a latter part of the switching period, respectively, wherein the control circuit part includes: a speed regulating resistor provided between the gate of the SiC-JFET and a source of the Si-MOSFET for regulating the switching speed; and a capacitor connected to the gate of the SiC-JFET, and wherein the capacitor is connected in parallel to the speed regulating resistor.