SMOOTH TRANSITIONING BUCK-BOOST DC-DC CONVERTER

摘要

A buck-boost DC-DC converter, which includes converter control circuitry, converter switching circuitry, and a first inductive element, is disclosed. The converter control circuitry provides a buck mode timing signal and a boost mode timing signal. The converter switching circuitry provides a switching output signal. During a buck mode of the buck-boost DC-DC converter, when a buck pulse-width of the switching output signal is less than a buck pulse-width threshold, the buck pulse-width is limited based on both the buck mode timing signal and the boost mode timing signal. During a boost mode of the buck-boost DC-DC converter, when a boost pulse-width of the switching output signal is less than a boost pulse-width threshold, the boost pulse-width is limited based on both the buck mode timing signal and the boost mode timing signal. The first inductive element receives and filters the switching output signal to provide a converter output signal.

主权项

1. A buck-boost DC-DC converter configured to operate in both a buck mode and a boost mode, and comprising:
converter control circuitry configured to provide a buck mode timing signal and a boost mode timing signal; converter switching circuitry configured to provide a switching output signal, wherein:
during the buck mode, when a buck pulse-width of the switching output signal is less than a buck pulse-width threshold, the buck pulse-width is limited based on both the buck mode timing signal and the boost mode timing signal;during the boost mode, when a boost pulse-width of the switching output signal is less than a boost pulse-width threshold, the boost pulse-width is limited based on both the buck mode timing signal and the boost mode timing signal; anda first inductive element is configured to receive and filter the switching output signal to provide a converter output signal.