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公开(公告)号：US08063581B2
公开(公告)日：2011-11-22
申请号：US12303376
申请日：2007-06-20
CPC分类号： H05B33/0848 , H05B33/0815
摘要： A drive circuit (1) for driving a load (3) comprises: a power supply (10) for supplying an output current (IL); a controller (20) for controlling the power supply; a current sensor (25) for generating a current sense signal (V25); a controllable switch (30) in series with the output (2a, 2b), the switch being controlled by a mode controller (50); wherein the mode controller in a reduced brightness mode generates its switch control signal (SLC) for the switch for alternatively opening and closing the switch. At the end of a current pulse, an average current value averaged over the pulse duration is calculated, compared with a reference value (VREF), and, if said average value is larger than the reference value, a duration for the next pulse pause is calculated such that an average value averaged over the entire pulse period is equal to the reference value.
摘要翻译： 用于驱动负载（3）的驱动电路（1）包括：用于提供输出电流（IL）的电源（10）; 用于控制电源的控制器（20）; 用于产生电流感测信号（V25）的电流传感器（25）; 与所述输出（2a，2b）串联的可控开关（30），所述开关由模式控制器（50）控制; 其中以减小亮度模式的模式控制器产生用于开关的切换控制信号（SLC），用于交替地打开和关闭开关。 在电流脉冲结束时，与参考值（VREF）相比，计算在脉冲持续时间上平均的平均电流值，并且如果所述平均值大于参考值，则下一脉冲暂停的持续时间为 被计算为使得在整个脉冲周期上平均的平均值等于参考值。
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公开(公告)号：US20090195184A1
公开(公告)日：2009-08-06
申请号：US12303376
申请日：2007-06-20
IPC分类号： H05B37/02
CPC分类号： H05B33/0848 , H05B33/0815
摘要： A drive circuit (1) for driving a load (3) comprises: a power supply (10) for supplying an output current (IL); a controller (20) for controlling the power supply; a current sensor (25) for generating a current sense signal (V25); a controllable switch (30) in series with the output (2a, 2b), the switch being controlled by a mode controller (50); wherein the mode controller in a reduced brightness mode generates its switch control signal (SLC) for the switch for alternatively opening and closing the switch. At the end of a current pulse, an average current value averaged over the pulse duration is calculated, compared with a reference value (VREF), and, if said average value is larger than the reference value, a duration for the next pulse pause is calculated such that an average value averaged over the entire pulse period is equal to the reference value.
摘要翻译： 用于驱动负载（3）的驱动电路（1）包括：用于提供输出电流（IL）的电源（10）; 用于控制电源的控制器（20）; 用于产生电流感测信号（V25）的电流传感器（25）; 与所述输出（2a，2b）串联的可控开关（30），所述开关由模式控制器（50）控制; 其中以减小亮度模式的模式控制器产生用于开关的切换控制信号（SLC），用于交替地打开和关闭开关。 在电流脉冲结束时，与参考值（VREF）相比，计算在脉冲持续时间上平均的平均电流值，并且如果所述平均值大于参考值，则下一脉冲暂停的持续时间为 被计算为使得在整个脉冲周期上平均的平均值等于参考值。
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