公开(公告)号：US20110127921A1

公开(公告)日：2011-06-02

申请号：US12954958

申请日：2010-11-29

申请人： Li-Wei Lin ,  Chen-Chiang LEE ,  Chi-Hsin LEE ,  Yuan-Po HUANG ,  Wen-Ming LIN

发明人： Li-Wei Lin ,  Chen-Chiang LEE ,  Chi-Hsin LEE ,  Yuan-Po HUANG ,  Wen-Ming LIN

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  H05B33/0887

摘要： A light-emitting diode (LED) current balance circuit includes a reference current generator, a current mirror and a voltage compensation circuit. The reference current generator provides a reference current robust against disturbance in a supply voltage applied to the reference current generator. The current mirror generates, according to the reference current, sink currents to bias lightbars and employs a structure to reduce the influence of unmatched transistors on the sink currents so as to stabilize and clamp currents through the lightbar. The voltage compensation circuit detects the voltages across the lightbars to compensate the lightbars having various forward voltages so as to ensure the turn-on of all lightbars and effectively balance the currents through the lightbars. Therefore, the invention employs simpler circuit architecture and not need a specific-purpose LED controller so as to be cheaper and more competitive.

摘要翻译： 发光二极管（LED）电流平衡电路包括参考电流发生器，电流镜和电压补偿电路。 参考电流发生器提供了对施加到参考电流发生器的电源电压中的干扰的参考电流。 电流镜根据参考电流产生吸收电流以偏置光棒并且采用结构来减少不匹配的晶体管对吸收电流的影响，以便稳定和钳制通过光棒的电流。 电压补偿电路检测光束两端的电压，以补偿具有各种正向电压的光棒，以确保所有光条的导通，并有效平衡通过光棒的电流。 因此，本发明采用更简单的电路架构，并且不需要特定目的的LED控制器，以便更便宜和更具竞争力。

公开(公告)号：US20110096055A1

公开(公告)日：2011-04-28

申请号：US12913837

申请日：2010-10-28

申请人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Wen-Ming Lin ,  Chun-Chi Liao ,  Yuan-Po Huang

发明人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Wen-Ming Lin ,  Chun-Chi Liao ,  Yuan-Po Huang

IPC分类号： G06F3/038

CPC分类号： H05B33/0887 ,  H05B33/0815 ,  H05B33/0818 ,  H05B33/0827

摘要： A light-emitting diode (LED) driving circuit for driving a plurality of first lightbars and a plurality of second lightbars includes a first current mirror, a second current mirror and a control circuit. The first current mirror, if enabled, balances current among the first lightbars. The second current mirror, if enabled, balances current among the second lightbars. During a first period, the control circuit disables the second current mirror and adjusts the duration of enabling the first current mirror according to a dimming signal. During a second period, the control circuit disables the first current mirror and adjusts the duration of enabling the second current mirror according to the dimming signal. Therefore, only first or second lightbars are driven in each period.

摘要翻译： 用于驱动多个第一光条和多个第二光棒的发光二极管（LED）驱动电路包括第一电流镜，第二电流镜和控制电路。 第一个当前的镜像，如果启用，平衡第一个光条之间的电流。 第二个电流镜如果启用，则平衡第二个光条之间的电流。 在第一时段期间，控制电路禁用第二电流镜，并且根据调光信号调节启用第一电流镜的持续时间。 在第二时段期间，控制电路禁用第一电流镜并根据调光信号调节启用第二电流镜的持续时间。 因此，在每个周期内仅驱动第一或第二个光条。

公开(公告)号：US08525774B2

公开(公告)日：2013-09-03

申请号：US12913837

申请日：2010-10-28

申请人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Wen-Ming Lin ,  Chun-Chi Liao ,  Yuan-Po Huang

发明人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Wen-Ming Lin ,  Chun-Chi Liao ,  Yuan-Po Huang

IPC分类号： G09G3/36 ,  G09G3/10

CPC分类号： H05B33/0887 ,  H05B33/0815 ,  H05B33/0818 ,  H05B33/0827

摘要： A light-emitting diode (LED) driving circuit for driving a plurality of first lightbars and a plurality of second lightbars includes a first current mirror, a second current mirror and a control circuit. The first current mirror, if enabled, balances current among the first lightbars. The second current mirror, if enabled, balances current among the second lightbars. During a first period, the control circuit disables the second current mirror and adjusts the duration of enabling the first current mirror according to a dimming signal. During a second period, the control circuit disables the first current mirror and adjusts the duration of enabling the second current mirror according to the dimming signal. Therefore, only first or second lightbars are driven in each period.

摘要翻译： 用于驱动多个第一光条和多个第二光棒的发光二极管（LED）驱动电路包括第一电流镜，第二电流镜和控制电路。 第一个当前的镜像，如果启用，平衡第一个光条之间的电流。 第二个电流镜如果启用，则平衡第二个光条之间的电流。 在第一时段期间，控制电路禁用第二电流镜，并且根据调光信号调节启用第一电流镜的持续时间。 在第二时段期间，控制电路禁用第一电流镜并根据调光信号调节启用第二电流镜的持续时间。 因此，在每个周期内仅驱动第一或第二个光条。

公开(公告)号：US08525436B2

公开(公告)日：2013-09-03

申请号：US12954958

申请日：2010-11-29

申请人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Yuan-Po Huang ,  Wen-Ming Lin

发明人： Li-Wei Lin ,  Chen-Chiang Lee ,  Chi-Hsin Lee ,  Yuan-Po Huang ,  Wen-Ming Lin

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  H05B33/0887

摘要： A light-emitting diode (LED) current balance circuit includes a reference current generator, a current mirror and a voltage compensation circuit. The reference current generator provides a reference current robust against disturbance in a supply voltage applied to the reference current generator. The current mirror generates, according to the reference current, sink currents to bias lightbars and employs a structure to reduce the influence of unmatched transistors on the sink currents to stabilize and clamp currents through the lightbar. The voltage compensation circuit detects the voltages across the lightbars to compensate the lightbars having various forward voltages to ensure the turn-on of all lightbars and to effectively balance the currents through the lightbars. Therefore, a simpler circuit architecture is employed which does not need a specific-purpose LED controller to be cheaper and more competitive.

摘要翻译： 发光二极管（LED）电流平衡电路包括参考电流发生器，电流镜和电压补偿电路。 参考电流发生器提供了对施加到参考电流发生器的电源电压中的干扰的参考电流。 电流镜根据参考电流产生吸收电流以偏置光棒并且采用结构来减少不匹配的晶体管对吸收电流的影响，以稳定和钳制通过光棒的电流。 电压补偿电路检测光束两端的电压，以补偿具有各种正向电压的光棒，以确保所有光条的导通，并有效平衡通过光棒的电流。 因此，采用更简单的电路结构，其不需要特定目的的LED控制器以便更便宜和更具竞争力。