公开(公告)号：US08901841B2

公开(公告)日：2014-12-02

申请号：US13692371

申请日：2012-12-03

申请人： Seoul Semiconductor Co., Ltd.

发明人： Byung Hoon Choi ,  In Kyu Park

IPC分类号： H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  G06F1/00 ,  H05B33/08

CPC分类号： H05B37/02 ,  H05B33/0809 ,  H05B33/0815 ,  Y02B20/346

摘要： The disclosure relates to an AC LED dimmer and dimming method thereof. The AC LED dimmer includes a rectifier receiving AC voltage from an AC voltage source and full-wave rectifying the AC voltage; a direct current (DC)/DC converter receiving the full-wave rectified voltage from the rectifier, generating a full-wave rectified stepped-up voltage, and generating a pulse enable signal; a pulse width modulation controller receiving the full-wave rectified stepped-up voltage and generating a pulse width modulation signal to dim an AC LED in response to the pulse enable signal; a switch driving the AC LED under control of the pulse width modulation signal, and an electromagnetic interference (EMI) filter to be connected between the AC voltage source and the switch to eliminate electromagnetic interference from the AC voltage source. Accordingly, the dimmer can perform an efficient and linear dimming function and suppress harmonics.

摘要翻译： 本发明涉及一种交流LED调光器及其调光方法。 交流LED调光器包括一个从交流电压源接收交流电压的整流器，并对交流电压进行全波整流; 直流（DC）/ DC转换器，其从整流器接收全波整流电压，产生全波整流升压电压，并产生脉冲使能信号; 接收全波整流升压电压的脉冲宽度调制控制器，响应于脉冲使能信号产生脉冲宽度调制信号，使AC LED变暗; 在脉冲宽度调制信号的控制下驱动交流LED的开关以及连接在交流电压源与开关之间的电磁干扰（EMI）滤波器，以消除交流电源的电磁干扰。 因此，调光器可以执行有效和线性的调光功能并抑制谐波。