Ripple currents minimizing method for common buffer capacitor of e.g. step-up converter, involves adjusting determined phase difference of signal during pulse width modulation period after processing pulses in another period

摘要

The method involves converting a direct current voltage into a pulse width modulation (PWM) signal, and forming a total pulse vector from pulse vectors of the signal. A phase difference of the signal is determined, and an actual pulse vector of the signal is changed around small phase angle range from the total pulse vector. The determined phase difference is considered for calculating the total pulse vector in an iteration step of other pulses. The determined phase difference is adjusted during a PWM period after processing the pulses in another PWM period.