| 摘要 |
The invention relates to a variable speed drive for three-phase electric motor, comprising a rectifier module ( 10 ) supplying a rectified voltage ( 15 ) from a single-phase alternating current network, a voltage step-up module ( 40 ) supplying a regulated bus voltage ( 45 ), an inverter module ( 50 ) supplying a control voltage to the motor (M). The variable speed drive comprises a hybrid power-factor correction device which drives the voltage step-up module and which comprises a digital circuit ( 30 ) provided with a voltage step-up module supplying a correction signal based on a measurement signal of said bus voltage and an analogue circuit ( 20 ) supplying a driver signal ( 25 ) to the step-up module based on a measurement signal of said rectified voltage and based on said correction signal.
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