公开(公告)号：WO2017053116A1

公开(公告)日：2017-03-30

申请号：PCT/US2016/051309

申请日：2016-09-12

Applicant: OSRAM SYLVANIA INC.

Inventor： XIAO, Peng ,  ZIEGLER, Markus

IPC: H02M7/5395 ,  H03M1/68 ,  H03M1/82 ,  H05B33/08

CPC classification number: H02M3/157 ,  H02M3/156 ,  H02M2001/0012 ,  H05B33/08

Abstract: A digitally compensated hysteretic power supply with enhanced resolution is provided. Such a power supply includes a comparator that is used to compare a load current sense signal with an internal signal generated from a digital-to-analog converter (DAC). A compensation circuit at a DAC input operates to improve current accuracy beyond the given DAC resolution. The current sense signal is converted to its digital equivalent, which is fed to a proportional-integral (PI) compensation loop, which in turn generates a relatively precise high resolution DAC input value. The DAC uses the higher part of the DAC value. The lower part of the DAC value is treated as a duty cycle number, and the DAC output is toggled between two levels at this duty cycle. This toggling generates a current output signal having a value that is the average of the two toggled values.

Abstract translation: 提供了具有增强分辨率的数字补偿迟滞电源。 这样的电源包括用于将负载电流检测信号与从数模转换器（DAC）产生的内部信号进行比较的比较器。 DAC输入端的补偿电路用于提高超出给定DAC分辨率的电流精度。 电流感测信号被转换成其数字等效电路，其被馈送到比例积分（PI）补偿环路，这又产生相对精确的高分辨率DAC输入值。 DAC使用DAC值的较高部分。 DAC值的下半部分被视为占空比数字，DAC占空比在两个电平之间切换。 该切换产生具有作为两个切换值的平均值的值的电流输出信号。

公开(公告)号：WO2017100793A1

公开(公告)日：2017-06-15

申请号：PCT/US2016/066229

申请日：2016-12-12

Applicant: OSRAM SYLVANIA INC.

Inventor： JOHNSEN, Andrew ,  CHEN, Keng ,  LI, Ming ,  XIAO, Peng

IPC: H05B33/08

CPC classification number: H05B33/0812 ,  H05B33/0827

Abstract: A multi string controller with independent current setting for each string is designed for solid state lighting applications. This controller can regulate multiple channels of LEDs. Each string may have a different forward voltage and current setting. A constant buck regulator is also integrated inside this controller to regulate the total current, which is fed into the LED output channels. The circuit also contains a feedback loop in order to precisely control the current passing through each string and is immune to transient conditions.

Abstract translation:

为每个串提供独立电流设置的多串控制器专为固态照明应用而设计。 该控制器可以调节多个通道的LED。 每个字符串可能有不同的正向电压和电流设置。 此控制器内还集成了一个恒定降压型稳压器，用于调节输入到LED输出通道的总电流。 该电路还包含一个反馈回路，以精确控制通过每个串的电流，并且不受瞬态情况的影响。