| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power conversion system in which an alarm sound can be generated without using a loud speaker and an amplifier, and an electric reactor like a motor, a filter, etc. can be downsized.SOLUTION: An electric power conversion system 1 according to an embodiment of the invention is a system in which electric power conversion is performed by using a PWM method, to generate drive electric power for driving a motor 6. The electric power conversion system 1 comprises a switching part 10 which generates drive electric power by performing switching corresponding to a PWM signal Spwm, and a control part 20 which generates the PWM signal Spwm by comparing a reference signal Sra corresponding to a desired motor output Sr and a carrier wave signal Sc. The control part 20 superposes an alarm signal Sa for an alarm sound on the reference signal Sra, and the frequency of the alarm signal Sa is an audible frequency. |
