A low power high noise immunity boost DC-DC converter using the differential difference amplifiers

摘要

A new boost converter using the differential difference amplifiers (DDAs) in the control loop is proposed. Compared with the traditional current mode boost converters, the circuitry of this controller is much simpler and consumes less power by eliminating the loop compensation, current sensing, and slope compensation circuits. A large duty ripple voltage generated by an Rr-Cr network is compared with the DDAs' outputs to get the duty cycles and changes the boost converter from a second order to a first order system. The large noise margin of the duty ripple voltage also gives this control excellent noise immunity performance.