| 摘要 |
PROBLEM TO BE SOLVED: To reduce a carrier sound with an inexpensive microcomputer by driving the switching element of a power converter based on the ON time count value and the ON time start count value of a canier signal period being obtained by phase modulation information and a voltage command signal. SOLUTION: An ON time count value TCon and an OFF time count value TCoff within the period of a carrier 1 are calculated by a PWM duty operation part 18a based on a voltage command signal V* and power supply voltage information Vin from a voltage command generation means 14 in an operation means 18. Then, the logic AND operation between the OFF time count value Tcoff and phase modulation information pm from a phase modulation information generation means 13 is performed by a logic AND operation part 18b, thus obtaining the count value of the start timing of the ON time. Then, based on the ON time count value and the count value of the start timing of ON time, a signal for driving the switching element of a power converter is outputted from a switching signal generation means 11. |
