| 摘要 |
PURPOSE:To reduce the content of a low order harmonic waves by controlling an inverter on the basis of a triangular wave, a triangular wave produced by multiplying the triangular wave by the prescribed pulse width ratio and a detection signal. CONSTITUTION:The output of an oscillator 13 is inputted to a triangular wave generator 14, the triangular wave of the output of the generator 14 is inputted through a one time amplifier 15 and 0.8 triangular composite circuit 16 to comparators 17, 18. A detection signal (p) is also inputted to the comparators 17, 18. An FF circuit 19 inputs the output of the oscillator 13, applies the output to an AND circuit 21, and through a NOT circuit 20 to an AND circuit 22. The outputs of the comparators 17, 18 are respectively inputted to the AND circuits 21, 22, and the outputs are inputted to an AND circuit 23. The comparison output pulse from a ring counter 24 and the output of the AND circuit 23 are inputted to a logic circuit 25, taking the coincidence of the inputs, and the control pulse of the inverter is outputted. |
