Constant input power modulation technique for high efficiency boost converter optimized for lithium-ion battery applications

A hysteretic synchronous boost power converter which employs a highly efficient constant input power modulation scheme is presented. This scheme varies the charge time of the boost inductor as a function of the inverse of the square of the input voltage. An analysis of the algorithm is presented, as well as a design procedure for a boost power converter optimized for the wide voltage range of lithium-ion batteries. Data is included describing the efficiency of the power converter compared to peak current type hysteretic converters, as well as plots depicting actual power converter run times while operating from a lithium-ion battery. Finally, a new integrated circuit which employs the constant input power modulation technique is introduced