| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensive current detection circuit capable of detecting imbalance of an output current from an inverter. <P>SOLUTION: Each output current of U-phase, V-phase and W-phase from the inverter 10 is detected by current transformers 21, 22, 23 respectively, and rectified and smoothed by rectifying circuits 24, 25, 26 respectively. Each output from the rectifying circuits 24, 25, 26 is input into a maximum value preferential circuit 31 and a minimum value preferential circuit 32, and a signal acquired by dividing an output from the maximum value preferential circuit 31 is compared with an output signal from the minimum value preferential circuit by a comparator 35. <P>COPYRIGHT: (C)2007,JPO&INPIT |
