Patent ID: 8675326

Claim:
A bidirectional switch device, comprising: a single HEMT being provided in a bidirectional current path including a first current path and a second current path; and a control circuit which, during a first condition, applies a first voltage lower than a threshold voltage between a gate of the single HEMT and one terminal among a source and a drain of the single HEMT to turn off the first current path from the other terminal among the source and the drain to the one terminal, and applies a fourth voltage equal to or higher than the threshold voltage between the gate and the other terminal to turn on the second current path from the one terminal to the other terminal, and during a second condition, applies a second voltage lower than the threshold voltage between the other terminal and the gate to turn off the second current path, and applies a fifth voltage equal to or higher than the threshold voltage between the gate and the one terminal to turn on the first current path, and further during a third condition, applies a third voltage equal to or higher than the threshold voltage between the source and the gate and between the drain and the gate to turn on the first and second current paths.