POWER SAVING DRIVING CIRCUIT INCLUDING POWER FACTOR CORRECTION FOR AN INDUCTION MOTOR

摘要

A power saving driving circuit for a motor including power factor correction comprises an induction motor; a power factor correction capacitor; a first switching element allowing the motor to operate in a positive sine wave period of an power supply voltage; a diode allowing the power factor correction capacitor to be charged during the first switching element being OFF; a second switching element allowing the motor to operate in a negative sine wave period of the power supply voltage; another diode allowing the power factor capacitor to be charged during the second switching element being OFF; a third switching element connected in parallel to the diode; a fourth switching element connected in parallel to the other diode; and a controller controlling the motor to save power by controlling the third and fourth switching elements when a charged voltage in the power factor correction capacitor reaches a predetermined set value.

主权项

1. A power saving driving circuit for a motor including power factor correction, comprising:
an induction motor; a power factor correction capacitor; a first switching element allowing the motor to operate in a positive sine wave period of an power supply voltage; a diode allowing the power factor correction capacitor to be charged during the first switching element being OFF; a second switching element allowing the motor to operate in a negative sine wave period of the power supply voltage; another diode allowing the power factor capacitor to be charged during the second switching element being OFF; a third switching element connected in parallel to the diode and allowing the motor to operate in a power saving mode with a discharge current of the power factor correction capacitor in the positive period of the power supply voltage; a fourth switching element connected in parallel to the other diode and allowing the motor to be operate in a power saving mode with a discharge current of the power factor correction capacitor in the negative period of the power supply voltage; and a controller controlling the motor to save power by controlling the third and fourth switching elements when a charged voltage in the power factor correction capacitor reaches a predetermined set value while the motor is normally operated by controlling the first and second switching elements.