| 摘要 |
PROBLEM TO BE SOLVED: To prevent current balance between plural switching elements from becoming worse and to surely perform a prescribed power transformation by respectively connecting a resistance element of a prescribed value to the emitter side of each switching element from the viewpoint of a gate controlling power source. SOLUTION: Resistance Re1 and Re2 of prescribed values are connected to emitter sides E1 and E2 of switching elements S1 and S2 in gate distribution lines from a gate control power source Vg. Circulating current that flows to the distribution lines of the emitter sides does not become large current, because it flows through the resistances Re1 and Re2. Also, because the circulating current has a short time constant and attenuates soon, it becomes completely zero by the time the elements S1 and S2 are turned on next time. Therefore, the balance of current does not become worse at parallel connection of plural switching elements. Also, because unwanted circulating current does not flow, the heat generation of the distribution line does not increase unnecessarily.
|
