CURRENT CONTROL FOR POWER CONVERTER

The invention relates to current control for a power converter. The present disclosure is related to accurate analog dimming of a light emitting diode (LED). Accurate dimming can require precise control of a power converter that supplies the LED with a current. The precise control relies on accurately sensing a level of the LED. When the power converter operates in a discontinuous conduction mode(DCM), for example at a low dimming ratio, the accuracy of the sensed LED-level can be affected by a resonant current offset, resulting from current ringing in the power converter. The disclosed circuits and methods provide accurate control of the LED-level by compensating for the resonant current offset in the sensed LED-level. 本申请涉及用于电源转换器的电流控制。本公开涉及发光二极管(LED)的准确模拟调光。准确调光可能需要精确控制为该LED供应电流的电源转换器。精确控制依赖于准确地感测该LED的电平。当该电源转换器例如在低调光比下以不连续导通模式(DCM)操作时，感测到的LED电平的准确性可能会受到由该电源转换器中的电流振荡引起的谐振电流偏移的影响。所公开的电路和方法通过补偿该感测到的LED电平中的谐振电流偏移来提供对该LED电平的准确控制。