| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem of a system for protecting a semiconductor switch device upon occurrence of arm short circuit, by detecting the absolute value of current and determining occurrence of arm short circuit when it exceeds a set value, that since a large current is cut off, there is a great risk of leading to device destruction.SOLUTION: A gate drive circuit for driving a voltage-driven power semiconductor device applied to a power converter is provided with short circuit current detection means for detecting a short circuit current flowing through the power semiconductor device, and short circuit current integration means for integrating the current detection value. When the integration value of the short circuit current integration means goes above a set value, the gate is cut off forcibly. |
