Power factor correction apparatus with variable capacitance

A power factor correction apparatus (10) applied to a power application system (20), the power application system (20) outputting a rectified power (202) to the power factor correction apparatus (10), the power factor correction apparatus (10) comprising:

• a detection unit (102) electrically connected to the power application system (20);
• a control unit (104) electrically connected to the detection unit (102);
• a variable capacitance unit 106 electrically connected to the power application system (20) and the control unit (104);
• and
• a power factor correction unit (108) electrically connected to the power application system (20) and the variable capacitance unit (106),
• wherein the variable capacitance unit (106) filters the rectified power (202);
• the detection unit (102) detects a status of the power application system (20) and then informs the control unit (104);
• according to the status of the power application system (20), the control unit (104) is configured to control a capacitance of the variable capacitance unit (106), so that a power factor of a power outputted from the power factor correction unit (108) to the power application system (20) is rising.