公开(公告)号：US20120049741A1

公开(公告)日：2012-03-01

申请号：US13216205

申请日：2011-08-23

申请人： Zhijun Ye ,  Yuancheng Ren ,  Lei Du ,  Naixing Kuang ,  Kaiwei Yao ,  James C. Moyer ,  Eric Yang

发明人： Zhijun Ye ,  Yuancheng Ren ,  Lei Du ,  Naixing Kuang ,  Kaiwei Yao ,  James C. Moyer ,  Eric Yang

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  G09G3/3406 ,  G09G2330/02 ,  G09G2330/021 ,  H05B33/0827 ,  Y02B20/341

摘要： A current balance scheme for driving LED strings is disclosed. A power supply unit provides a driving voltage to drive a plurality of LED strings. A feedback selector is configured to select a minimum feedback signal indicative of the driving voltage to the power supply unit for regulating the driving voltage. Based on the minimum feedback signal, the driving voltage gets a minimum value to sufficiently drive the plurality of LED strings. A protection circuit is configured to protect the current balance circuit from high voltage especially when there is a shorted LED string.

摘要翻译： 公开了用于驱动LED串的电流平衡方案。 电源单元提供驱动电压以驱动多个LED串。 反馈选择器被配置为选择表示用于调节驱动电压的电源单元的驱动电压的最小反馈信号。 基于最小反馈信号，驱动电压达到最小值以充分驱动多个LED串。 保护电路被配置为保护电流平衡电路免受高压，特别是当存在短路的LED串时。

公开(公告)号：US08907592B2

公开(公告)日：2014-12-09

申请号：US13048730

申请日：2011-03-15

申请人： Jin Hu ,  Lei Du ,  Yuancheng Ren ,  Junming Zhang ,  Zhijun Ye

发明人： Jin Hu ,  Lei Du ,  Yuancheng Ren ,  Junming Zhang ,  Zhijun Ye

IPC分类号： H05B37/02 ,  H05B33/08

CPC分类号： H05B33/0827 ,  H05B33/0809 ,  H05B33/0812 ,  Y02B20/341

摘要： Embodiments of LED driver circuits and the associated methods are disclosed herein. In one embodiment, the LED driver circuit comprises a switch-mode converter, a controller, a feedback circuit, and a gating circuit. The feedback circuit includes a current balance circuit. The gating circuit is responsive to both a current feedback signal and a voltage feedback signal and is configured to select one of them as the feedback signal.

摘要翻译： LED驱动器电路和相关方法的实施例在此公开。 在一个实施例中，LED驱动器电路包括开关模式转换器，控制器，反馈电路和门控电路。 反馈电路包括电流平衡电路。 门控电路响应于电流反馈信号和电压反馈信号，并且被配置为选择它们中的一个作为反馈信号。

公开(公告)号：US20110227497A1

公开(公告)日：2011-09-22

申请号：US13048730

申请日：2011-03-15

申请人： Jin Hu ,  Lei Du ,  Yuancheng Ren ,  Junming Zhang ,  Zhijun Ye

发明人： Jin Hu ,  Lei Du ,  Yuancheng Ren ,  Junming Zhang ,  Zhijun Ye

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  H05B33/0809 ,  H05B33/0812 ,  Y02B20/341

摘要： Embodiments of LED driver circuits and the associated methods are disclosed herein. In one embodiment, the LED driver circuit comprises a switch-mode converter, a controller, a feedback circuit, and a gating circuit. The feedback circuit includes a current balance circuit. The gating circuit is responsive to both a current feedback signal and a voltage feedback signal and is configured to select one of them as the feedback signal.

摘要翻译： LED驱动器电路和相关方法的实施例在此公开。 在一个实施例中，LED驱动器电路包括开关模式转换器，控制器，反馈电路和门控电路。 反馈电路包括电流平衡电路。 门控电路响应于电流反馈信号和电压反馈信号，并且被配置为选择它们中的一个作为反馈信号。

公开(公告)号：US20130020945A1

公开(公告)日：2013-01-24

申请号：US13550912

申请日：2012-07-17

申请人： Naixing Kuang ,  Haigang Cao ,  Zhijun Ye

发明人： Naixing Kuang ,  Haigang Cao ,  Zhijun Ye

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0845

摘要： A LED driver comprising: a power switch; a transformer comprising a primary winding coupled to the power switch, a secondary winding and a third winding; a current sense circuit configured to sense a current flowing through the power switch and generates a current sense signal; a zero cross detecting circuit configured to detect a current flowing through the secondary winding, and generates a zero cross detecting signal; a compensation circuit configured to compensate the current sense signal based on the current flowing through the third winding; a control circuit configured to receive the compensated current sense signal and the zero cross detecting signal, and wherein the control circuit generates a control signal to control the power switch.

摘要翻译： 一种LED驱动器，包括：电源开关; 变压器，包括耦合到所述电源开关的初级绕组，次级绕组和第三绕组; 电流感测电路，被配置为感测流过电源开关的电流并产生电流感测信号; 零交叉检测电路，被配置为检测流过次级绕组的电流，并产生零交叉检测信号; 补偿电路，被配置为基于流过所述第三绕组的电流补偿所述电流感测信号; 控制电路，被配置为接收经补偿的电流检测信号和过零检测信号，并且其中控制电路产生控制信号以控制电源开关。

公开(公告)号：US08970122B2

公开(公告)日：2015-03-03

申请号：US13550912

申请日：2012-07-17

申请人： Naixing Kuang ,  Haigang Cao ,  Zhijun Ye

发明人： Naixing Kuang ,  Haigang Cao ,  Zhijun Ye

IPC分类号： H05B37/02 ,  H05B33/08

CPC分类号： H05B33/0815 ,  H05B33/0845

摘要： A LED driver comprising: a power switch; a transformer comprising a primary winding coupled to the power switch, a secondary winding and a third winding; a current sense circuit configured to sense a current flowing through the power switch and generates a current sense signal; a zero cross detecting circuit configured to detect a current flowing through the secondary winding, and generates a zero cross detecting signal; a compensation circuit configured to compensate the current sense signal based on the current flowing through the third winding; a control circuit configured to receive the compensated current sense signal and the zero cross detecting signal, and wherein the control circuit generates a control signal to control the power switch.

摘要翻译： 一种LED驱动器，包括：电源开关; 变压器，包括耦合到所述电源开关的初级绕组，次级绕组和第三绕组; 电流感测电路，被配置为感测流过电源开关的电流并产生电流感测信号; 零交叉检测电路，被配置为检测流过次级绕组的电流，并产生零交叉检测信号; 补偿电路，被配置为基于流过所述第三绕组的电流补偿所述电流感测信号; 控制电路，被配置为接收经补偿的电流检测信号和过零检测信号，并且其中控制电路产生控制信号以控制电源开关。