| 摘要 |
PROBLEM TO BE SOLVED: To provide a formation apparatus by which an inverter is operated normally without shortening the interval between DC voltages to be input from the inverter by providing a first AND circuit and a second AND circuit to which a PWM control signal or the output signal of a second inverter is input. SOLUTION: Output of a first flip-flop 27 and a second flip-flop 28 are input respectively to a second NAND circuit 26 and a first NAND circuit 25. A PWM control signal, the output signal of the first flip-flip 27 and the output signal, of a third inverter 31, in which the output of a second AND circuit 30 is inverted are input to a first AND circuit 29. The output signal of the second flip-flop 28 and the output signal, of a fourth inverter 32, in which the output of the first AND circuit 29 is inverted are input to the second AND circuit 30. Thereby, positive pulses and negative pulses having a dead time can be obtained from the single-phase PWM control signal, and an inverter can be operated normally without shortening the interval between DC voltages which are input from the inverter due to the dead time. |
