公开(公告)号：US08569975B2

公开(公告)日：2013-10-29

申请号：US13089694

申请日：2011-04-19

申请人： Daisuke Uchimoto ,  Naoki Inoue ,  Yoju Imamura

发明人： Daisuke Uchimoto ,  Naoki Inoue ,  Yoju Imamura

IPC分类号： H05B37/02 ,  H05B41/36

CPC分类号： H02M3/156 ,  G09G3/3406 ,  G09G2320/064 ,  H05B33/0818 ,  H05B33/0824 ,  Y02B20/346

摘要： A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.

摘要翻译： 控制IC控制开关电源，其被配置为将驱动电压Vout提供给以间歇方式驱动的LED串的一个端子。 采样保持电路对导通期间的驱动电压Vout进行检测电压Vs的采样，并将采样检测电压Vs保持在断开期间。 在关闭期间，脉冲调制器产生脉冲信号，该脉冲信号的调整占空比使得从采样保持电路输出的保持检测电压VsH与检测电压Vs匹配。 驱动器根据脉冲信号驱动开关晶体管。

公开(公告)号：US20110273104A1

公开(公告)日：2011-11-10

申请号：US13089694

申请日：2011-04-19

申请人： Daisuke UCHIMOTO ,  Naoki INOUE ,  Yoju IMAMURA

发明人： Daisuke UCHIMOTO ,  Naoki INOUE ,  Yoju IMAMURA

IPC分类号： H05B37/02

CPC分类号： H02M3/156 ,  G09G3/3406 ,  G09G2320/064 ,  H05B33/0818 ,  H05B33/0824 ,  Y02B20/346

摘要： A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.

摘要翻译： 控制IC控制开关电源，其被配置为将驱动电压Vout提供给以间歇方式驱动的LED串的一个端子。 采样保持电路对导通期间的驱动电压Vout进行检测电压Vs的采样，并将采样检测电压Vs保持在断开期间。 在关闭期间，脉冲调制器产生脉冲信号，该脉冲信号的调整占空比使得从采样保持电路输出的保持检测电压VsH与检测电压Vs匹配。 驱动器根据脉冲信号驱动开关晶体管。