| 摘要 |
PURPOSE: To simplify the circuit configuration by providing a transformer having two windings at the secondary side and two output systems including the secondary side winding of the transformer in an inverter, and switching an output system at the decided timing. CONSTITUTION: When a reference sine wave made by a reference sine wave generator 320 attain the timing of zero-cross varying from a positive half period to a negative half period, a zero-cross signal (l point) of a predetermined time width is synchronously output from a zero-cross signal generator 360. The output signals (r), (s) of a system switching unit 340 attain a high level by the OR of the zero-cross signal and the signals at points (h), (i). Therefore, the output systems of MOSFETs 240, 250 both come operated, and the operation can be smoothly switched from one output to the other output. |
