| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving circuit eliminating the possibility in which, when any failure occurs in constant-current control, a switching element S*# is subjected to thermal breakage and a surge in association with change-over of a switching state is excessively increased. <P>SOLUTION: A driving circuit is provided, in which positive charges outputted from a power supply 20 are charged in a gate of a switching element S*# through an abnormality detection resistor 22, a constant current resistor 24 and a charging switching element 32, and at this time a gate voltage of the charging switching element 32 is controlled by an operational amplifier 36 so that a voltage drop amount of the constant current resistor 24 becomes a specified value, and a voltage drop amount of the abnormality detection resistor 22 is taken into a charging side abnormality determination section 62, and based on the voltage drop amount, it is determined whether abnormality of constant current control is present or not. <P>COPYRIGHT: (C)2012,JPO&INPIT |
