Patent ID: 9590616
Date: 2017-03-07
CPC Classifications: H01L,H02M,H03K,Y02B

Claim:
1. A drive control device for two semiconductor elements, each semiconductor element having an insulated gate type transistor structure, to which a gate drive voltage is applied, and a diode structure arranged on a same semiconductor substrate, the transistor structure and the diode structure having a common energization electrode, the drive control device comprising: a current detection device that outputs a current detection signal corresponding to a current flowing through at least one of the two semiconductor elements; and a first control device that outputs a gate drive signal for instructing to apply the gate drive voltage from when a first time period has elapsed from a starting time to when a second time period has elapsed from the starting time, at which an off-command signal is input after it is determined based on the current detection signal that a current flows through the at least one of the two semiconductor elements in a forward direction of the diode structure during a time period for which an on-command signal is input to the at least one of the two semiconductor elements, wherein: the two semiconductor elements provide a half-bridge circuit; and the first time period and the second time period are preliminary set not to generate an arm short-circuit between the two semiconductor elements.