| 摘要 |
A current flowing into one of half-bridge circuits of a power semiconductor module (10) is detected by corresponding one of current detection circuits (11a and 11b to 11f) through a current detection terminal provided in corresponding one of semiconductor switching devices (Q1 and Q2 to Q6) forming the half-bridge circuits and a current detection terminal provided in corresponding one of flywheel diodes (D1 and D2 to D6) back-to-back connected to the corresponding one of the semiconductor switching devices (Q1 and Q2 to Q6). A pulse voltage waveform indicating the current detected by the corresponding one of the current detection circuits (11a and 11b to 11f) is held for a predetermined period and converted into a stepwise voltage waveform by use of corresponding one of sample-and-hold circuits (14a, 14b and 14f), so that the voltage held by the corresponding one of the sample-and-hold circuits (14a, 14b and 14c) is transmitted to a control circuit (20) through corresponding one of insulating circuits (14a, 14b and 14c). |
