Samsung Electro-mechanics Co., Ltd.

Han Hee Lee

Heung Gyoon Choi

Sang Gab Park

Hyo Joong An

Nam Jin Park

Young Seung Roh

Sung Soo Hong

Sang Kyoo Han

Chung Wook Roh

Kyu Min Park

Gyu Min Park

Su Hun Jo

There are provided a DC/DC converter and a driving apparatus having the same. The DC/DC converter includes a DC/DC converter part converting an input power into a predetermined DC power by switching the input power to thereby supply the converted DC power to a light emitting device; and a control part controlling switching of the DC/DC converter part in accordance with a driving signal applied to the light emitting device to thereby control a voltage level of the DC power.

DC/DC converter and driving apparatus having the same

The present invention provides a control circuit of an LLC resonant converter including a minimum switching frequency variable circuit of varying a minimum switching frequency corresponding to an AC input voltage of the LLC resonant converter; and a first pulse signal generating unit and a second pulse signal generating unit to generate a first pulse signal and a second pulse signal based on a switching frequency limited by the minimum switching frequency variable circuit.

Control circuit of LLC resonant converter and LLC resonant converter using the same

There is provided a lamp driver including: a power supplying part switching an input power, supplying a driving power to at least one lamp, and controlling brightness of the at least one lamp according to a dimming signal; a signal supplying part supplying a first comparison result signal obtained by comparing a current sensing signal sensing a current flowing through the at least one lamp with a reference signal having a current level set beforehand when the dimming signal is a logic high signal, and supplying a second comparison result signal having a voltage level set beforehand when the dimming signal is a logic low signal; and a controlling part controlling the switching of the power supplying part according to a signal being supplied by the signal supplying part.

Lamp driver

Growing community of inventors

Gyunggi-do, South Korea

Han Hee Lee