초록 ▼

The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outp

The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.

대표청구항 ▼

[ What is claimed is:] [1.]1. In a motor driving inverter system rectifying/smoothing an alternating current power, and driving a motor by performing pulse width modulation, a power factor compensation device for the motor driving inverter system, comprising:an inverter connected to the motor;a micr

[ What is claimed is:] [1.]1. In a motor driving inverter system rectifying/smoothing an alternating current power, and driving a motor by performing pulse width modulation, a power factor compensation device for the motor driving inverter system, comprising:an inverter connected to the motor;a microprocessor for detecting zero crossing points of the alternating current power to determine time periods therebetween, and for sequentially outputting a driving signal corresponding to one of a plurality of sine wave form voltage values according to the detected result of a time period and a voltage of the alternating current power, in a state where the plurality of sine wave form voltage values corresponding to the voltage of the alternating current power and frequencies are internally stored; anda switching transistor connected in parallel to the inverter, and switched according to the driving signal, a duty of the driving signal being varied correspondingly to each of the plurality of sine wave form voltage values.