| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that restraining a surge voltage is difficult due to a small gate resistance when a large current is turned off where a surge voltage tends to appear, in noise countermeasures for reducing noise by increasing the gate resistance in a small current and, while reducing a switching loss by decreasing the gate resistance for a large current. <P>SOLUTION: A resistor (4) is connected to a gate resistor (3) of a switching element (1) via a switch (5) in parallel. When a detection temperature in a temperature sensor (11) exceeds a specific temperature, and at the same time a detection current in a current sense (12) is set to a specific value or more, the switch (5) is turned on, the gate resistance is set to be the parallel resistance of the resistors (3) and (4). In the cases other than that in the above, the gate resistance is formed by the resistor (3) only. <P>COPYRIGHT: (C)2003,JPO |
