A High Conversion Ratio and 97.4% High Efficiency Three-Switch Boost Converter With Duty-Dependent Charge Topology for 1.2-A High Driving Current and 20% Reduction of Inductor DC Current in MiniLED Applications Si-Yi Li, Student Member , IEEE, Y en-An Lin, Zheng-Lun Huang, Jia-Jyun Lee

Abstract

This article presents a three-switch (3S) boost con- verter with hysteresis current control applied in MiniLED panels. It uses only three power switches to achieve high conversion ratio (=7.5) and low inductor current (20% lower than conventional boost converters). Meanwhile, the charging time of the flying capacitor will increase as the duty cycle increases. It enables the proposed 3S boost converter to have a high drive current (=1.2 A). In addition, the right half-plane (RHP) zero of the proposed topology is related to the switching frequency. By dynamically adjusting the position of RHP zero during transients, the recovery time and output voltage drop can be reduced at the same time. When the load increases from 120 mA to 1.2 A, the recovery time can be accelerated to 42 µs, and the maximum efficiency can reach 97.4%.