Adaptive Low-Power Zero-Cross Comparator for Discontinuous Current Mode Operated Switching Mode Power Supply

摘要

A time off estimator and an adaptive controller implemented on an integrated circuit to emulate current dependent zero crossing circuitry to permit improved performance of a buck type switching mode power supply. The time off estimator circuit is enhanced by an automatic correction circuit for the timing of a zero crossing where energy to a reference capacitor returns to zero and is turned off awaiting the next cycle where the capacitor is again charged and discharged.

主权项

1. A switching mode power supply (SMPS), comprising:
a) a time off (toff) estimator; b) an adaptive controller; and c) said estimator predicts a time when energy flow is turned off, wherein said adaptive controller determines the best toff setting.