Delta Electronics, Inc.

Ying-Hao Huang

Chung-Chieh Cheng

Kun-Ming Tien

Wei-Ting Chien

Yen-Jyh Lai

Kuan-Hsien Tu

Fixed luminaire

An LED lighting module comprises a plurality of serially-connected LED strings, which include N LED strings from a first LED string to an Nth LED string, and each LED string has a specific driven voltage. The control method comprises steps of: (a) receiving an AC voltage signal and converting the AC input signal into a first AC signal; (b) receiving the first AC signal and converting the first AC signal into a first DC signal; and (c) if the first DC signal exceeds the sum of the driven voltages from the first LED string to an nth LED string, driving the serially-connected LED strings from the first LED string to the nth LED string sequentially, wherein n is smaller than or equal to N, so as to adjust the correlated color temperature of the light emitted by the LED lighting module.

Growing community of inventors

Taoyuan, Taiwan

Ying-Hao Huang