| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that voltage applied to a conduction control terminal temporarily becomes unstable when a voltage applying means which can variably set voltage output to the conduction control terminal of a switching element of a voltage driving type is installed and the switching element is driven. <P>SOLUTION: A voltage setting part 40 increases voltage output to a gate of the switching element SW by increasing a duty against a driving voltage generating circuit 26 when a temperature of the switching element SW, which is detected by a temperature sensing diode D, becomes not less than a prescribed temperature. Switching of a switching state and change of output voltage of the driving voltage generating circuit 26 are prevented from being overlapped based on a driving signal of the switching element SW. <P>COPYRIGHT: (C)2008,JPO&INPIT |
