Design And Research Of A Wide-voltage-domain Buck-type Digital SIDO Switching Converter

With the rapid development of Internet of things and fifth generation mobile communication network,low power consumption,high efficiency,miniaturization and other technical characteristics become the research and development direction of mobile intelligent terminal system.Single inductor multi output switching converter can output multiple independent voltages through a single inductor,which provides a reliable solution for electronic equipment requiring multi voltage levels,and reusing a single inductor greatly reduces the volume and cost of the power supply system.At present,the demand for power supply of electronic equipment is increasing day by day.Due to its strong adaptability and flexibility,digital switching power supply is increasingly concerned by many research institutions,and is becoming a hot research direction in the field of switching power supply.In this paper,the working states of SIDO buck converter under different modes are analyzed.A control algorithm of wide voltage domain buck type digital SIDO switch converter is proposed.The stable state of the switch converter is derived by making full use of the principle of capacitor zero current control.At the same time,the optimal dynamic response algorithm of time sequence switching control is used in the switch converter when the input voltage changes suddenly.The digital control algorithm is based on FPGA.At the same time,the system platform of the buck type digital SIDO switch converter is built to verify the feasibility of the algorithm.The test results show that the digital SIDO converter based on the designed control algorithm has the characteristics of fast dynamic response against external disturbance and small output voltage ripple.When the input voltage changes from 3V to 5V,the dynamic response time of the traditional control algorithm is 5ms.Based on the control algorithm proposed in this paper,the dynamic response time of the switch converter is 0.5ms,and the ripple value is 3.3% of the output voltage,which effectively verifies the effectiveness of the proposed control algorithm.