Linear-non-linear control to improve fast transient response in hybrid sources

Abstract

This paper presents a new type of hybrid source based on the combined linear-nonlinear control (HS-LnL). The hybrid sources are composed of both a linear and a switching source connected in parallel. The linear-nonlinear control allows to reduce the current provide by the linear source when a load current step occurs. This fact has an effect on the hybrid source efficiency. Three prototypes have been built to check and to compare the experimental results. These results prove, for the HS-LnL, that the output voltage drop is limited, the efficiency is not affected by including a linear source and fast transient response is improved. The obtained experimental results show that these power supplies can be used to feed DSPs and microprocessors.