| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drive control circuit capable of stably operating a power semiconductor switching element, even when a supplied power supply voltage fluctuates. <P>SOLUTION: The drive control circuit 1 of a semiconductor switching element (IGBT) 2 includes a voltage division circuit 20, a drive unit 10 and a constant voltage circuit 30. The voltage division circuit 20 has a voltage division node ND which divides a power supply voltage VS supplied from a DC power supply 40 and takes out the voltage-divided power supply voltage VS. The voltage division node ND is connected to the emitter E of the IGBT 2. The drive unit 10 electrically connects a gate electrode G to any of the positive electrode side power supply node NP of the DC power source 40 and the voltage division node ND in response to a control signal SG input from outside, turning on/off the IGBT 2. The constant voltage circuit 30 is connected between the positive electrode side power supply node NP and the voltage division node ND, keeping the voltage between the nodes NP, ND constant. <P>COPYRIGHT: (C)2011,JPO&INPIT |
