Matsushita Electric Industrial Co., Ltd.

Shigeki Harada

Takashi Deguchi

Masahiro Kadono

Kazumi Kouyama

In a controlling apparatus for a simulated sinusoidal wave of unequal width PWM inverter, wherein PWM signal comprises a data region and a HALT region in each of carrier period timer, the carrier period timer T.sub.0 and data unit timer T.sub.2 are controlled by each other independent digital values by each other independent microcomputers (5, 6) or by use of each other different timers (10, 11), and the data unit timer T.sub.2 is controlled by an output of a power source voltage fluctuation detector (18), thereby to provide a constant voltage-frequency characteristic even at voltage fluctuation.

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Takatsuki, Japan

Shigeki Harada