| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive method for detecting a DC component of an inverter output voltage by eliminating the need for expensive components such as a detector. <P>SOLUTION: The circuit for detecting the DC component included in the AC output voltage of an inverter comprises a low-pass filter, a first operational amplifier, and a second operational amplifier. One power supply of the first operational amplifier has potential identical to the potential at one AC output terminal of the inverter, and the power supply of the second operational amplifier has potential different from the potential at one AC output terminal of the inverter. A detection signal is transmitted to the control circuit using a differential amplifier as the second operational amplifier. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
