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Active Power Factor Correction (PFC) Circuit With Resistor-Free Zero-Current Detection

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4 Author(s)
Yong-Seong Roh ; Integrated Circuits Lab., Hanyang Univ., Seoul, South Korea ; Young-Jin Moon ; Jung-Chul Gong ; Changsik Yoo

An active power-factor correction (PFC) circuit is presented that employs a newly proposed resistor-free zero-current detection (ZCD). While the conventional ZCD requires either a sensing resistor or auxiliary transformer, the proposed ZCD requires only one OFF-chip capacitor. The active PFC circuit with the proposed resistor-free ZCD has been implemented in a 0.35-μm BCDMOS process and the power factor is improved up to 9% from the one employing the conventional ZCD. The proposed resistor-free ZCD scheme can be applied to any type of switch-mode dc-dc power converter.

Published in:

Power Electronics, IEEE Transactions on  (Volume:26 ,  Issue: 2 )