| 摘要 |
An electric household appliance (1) having an electronic control device (8) which controls two three-phase electric motors (6) (7), and has two electronic power circuits (9) (10), each of which has three power circuit branches (15) connected between two power lines (13) (14); six transistors (22) (23) arranged two to each power circuit branch (15), and having six respective control terminals (19) (20) for receiving six corresponding PWM control signals (G1)(G2); a DSP microprocessor (24) for generating at least six PWM pulse signals; and six amplifying modules (30-35), each of which receives one PWM pulse signal (SPWM1-SPWM6) from the DSP microprocessor (24), and has two output terminals (30b-35b)(30c-35c) connected to the respective control terminals (19) (29) of two controlled switches (22) (23) in the same power circuit branch (15); each amplifying module (30-35) amplifying the one PWM pulse signal (SPWM1-SPWM6) to supply one output terminal with a PWM control signal (G1) corresponding to the one PWM pulse signal (SPWM1-SPWM6), and to supply the other output terminal with a PWM control signal (G2) corresponding to a negated one PWM pulse signal (SPWM1-SPWM6).
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