Fairchild Korea Semiconductor Ltd.

Silicon Mitus, Inc.

Dae-Jung Kim

Jung-Won Kim

Dong-Hee Kim

The present invention relates to a set protection circuit for when a diode short-circuit defect occurs in a power factor correction circuit of a critical conduction mode. In a conventional power factor correction circuit, an excessive amount of current flows to a switch if a diode is short-circuited so that the switch is damaged. In order to prevent damage to the switch, the present invention provides a method for stopping turn-on of the switch when a switch current is excessive.

Power factor correction circuit and driving method thereof

Disclosed is a power factor correction circuit for varying an output voltage according to an input voltage, and an output voltage control method thereof. A reference voltage is generated corresponding to a voltage at an output terminal of a boost circuit at a predetermined time by using the status in which the voltage at the output terminal thereof has information on an input AC voltage until the predetermined time after the input AC voltage is applied in the boost circuit. The output voltage is controlled to be generated according to the reference voltage. Therefore, the output voltage is generated corresponding to the input AC voltage without any additional devices, and reduces power loss.

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Incheon, South Korea

Dae-Jung Kim