Samsung Electronics Co., Ltd.

Seoul National University

Lsis Co., Ltd.

Bo Hyung Cho

Jin-han Kim

Chun Suk Yang

Han Sol Seo

Woo Sup Kim

Paul Jang

Sang Woo Kang

Seoung Woon Lee

A power factor correction circuit and an electronic product including the same are disclosed. This technology configures a bridgeless circuit with no rectifier diode by using an additional switch, eliminating conduction loss due to the diode and reducing common mode EMI noise of the power factor correction circuit. A power factor correction circuit includes at least one inductor directly connected to an AC input stage, an output capacitor to smooth the output voltage, first switching elements to control current to store magnetic energy in the inductor, and a second switching element to maintain a substantially constant voltage between a ground voltage of an AC input stage and a ground voltage of an output stage.

Power factor correction circuit and electronic product including the same

Disclosed is a DC-DC converter. The DC-DC converter includes a power input unit to which power is applied, a first module comprising a first transformer and a second transformer to output a first output power transformed according to operations of a first switch and a second switch connected with the first transformer and the second transformer by using the applied power, a second module comprising a third transformer and a fourth transformer to output a second output power transformed according to operations of a third switch and a fourth switch connected with the third transformer and the fourth transformer by using the applied power, an output unit to output a sum of the first output power and the second output power, and a controller to control an interleaving operations between the first module and the second module.

DC-DC converter utilizing output power to turn off switches

Growing community of inventors

Seoul, South Korea

Bo Hyung Cho