Improved Commutation Control in Switching Regulators for Battery Equalizer Applications

V. Mihov, E. Dinkov
Technical University of Sofia, Branch Plovdiv, BG

Keywords: synchronous switching, commutation control, adaptive feedback driver circuit


This paper presents an easy accessible method for improvment of performance characteristics in some switching regulators topologies, inverters and others. Some strengths and weaknesses of synchronous switching are shown. The authors propose a solution for better operation of switching regulators in terms to avoid some of their main disadvantages - active power losses in switching elements and low quality waveforms caused by large transient time of commutation. It is based on a strategy of an adaptive feedback adjusting dead-time commutation. A test circuit and experimental results of a dynamic non-overlap control with adaptive feedback are presented at the end of paper. Driver circuit with adaptive feedback (whose circuit diagram is presented) is developed and tested in switching regulators for battery equalizer applications. A comparison between different control methods is given. The proposed driver circuit topology improves the switching regulator performance by proper adjusting dead-time. This allows to reduce switching losses, power dissipation and increases total efficiency, compared to the common driver circuit with fixed delay time settings, used in most of the switching regulator topologies.