| 摘要 |
PROBLEM TO BE SOLVED: To obtain the positively biased sine waves and negatively biased sine waves of an output voltage from one piezoelectric transformer by concurrently outputting the positively biased sine waves and negatively biased sine waves. SOLUTION: A piezoelectric transformer drive circuit 1 drives a piezoelectric transformer 2, and the piezoelectric transformer 2 boosts the voltage outputted from the drive circuit 1 and outputs it. An output voltage bias circuit 3 applies an aimed DC bias to the output voltage of the piezoelectric transformer 2. Series connection circuits of diodes 4 and capacitors 5 are inserted between the piezoelectric transformer 2 and GND, the diodes 4 are reversed in polarity, and positively biased sine waves and negatively biased sine waves can be concurrently outputted. The output voltage apparently corresponding to two piezoelectric transformers can be obtained, and positive ions and negative ions can be generated in turn with no complicated control. |
