GPI control based on current control scheme for switched-capacitor step-down DC to DC converter

In this article we propose a Generalized Proportional Integral control based on the use of current control scheme (CCS), such that we will allow to regulate toward a desired of output voltage of the switched-capacitor (SC) step-down DC to DC converter. With the CCS, capacitors are charged with near constant current, controlled by the gate-source voltage of the MOSFET's. By paralleling two SC cells, the converter input current becomes continuous, resulting in much reduced conducted electromagnetic interference with other circuits fed by the same power supply. All MOSFET's are operated for half of the switching period, in order to improve the regulation capability. The proposed controllers design approach is robust with respect to sudden constant load variations and it only requires the measurement of the output voltage of the inverter. The main features of the proposed control system is evaluated through computer simulations.