公开(公告)号：US08710750B2

公开(公告)日：2014-04-29

申请号：US13274617

申请日：2011-10-17

申请人： Takafumi Nonaka ,  Takashi Kumagai ,  Yuichiro Ito ,  Haruka Kinoshita ,  Shinsuke Funayama ,  Takashi Maeda

发明人： Takafumi Nonaka ,  Takashi Kumagai ,  Yuichiro Ito ,  Haruka Kinoshita ,  Shinsuke Funayama ,  Takashi Maeda

IPC分类号： H05B39/00

CPC分类号： H05B33/0815 ,  Y02B20/347

摘要： A power supply circuit drives circuits having different numbers of series-connected LEDs without changing a circuit constant or a component. An LED series circuit is connected to a power converter circuit of a power supply circuit. The power converter circuit is controlled by a control arithmetic circuit, and supplies a constant current to the LED series circuit. A voltage detection circuit detects a voltage applied to the LED series circuit. The control arithmetic circuit checks whether the LED series circuit has 40 LEDs or 20 LEDs, based on the voltage detected by the voltage detection circuit. The control arithmetic circuit holds a constant-current value table for 40 LEDs and a constant-current value table for 20 LEDs. In accordance with the detected voltage, the control arithmetic circuit selects one constant-current value table, and controls the power converter circuit based on the constant-current value table selected.

摘要翻译： 电源电路驱动具有不同数量的串联LED的电路，而不改变电路常数或部件。 LED串联电路连接到电源电路的电源转换器电路。 功率转换器电路由控制运算电路控制，并向LED串联电路提供恒定电流。 电压检测电路检测施加到LED串联电路的电压。 控制运算电路根据电压检测电路检测出的电压，检查LED串联电路是否具有40个LED或20个LED。 控制运算电路保存40个LED的恒定电流值表和20个LED的恒定电流值表。 根据检测到的电压，控制运算电路选择一个恒流值表，并根据所选择的恒流值表控制功率转换电路。