Research And Design Of A High-efficiency Current Mode Converter

With the development of electronics industry, DC-DC converters have been widely used in lots of electronic equipments, DC-DC converters are the key roles in the tradeoff between power consumption and performance of potable applications. At the same time because of electronic products continued to work to further upgrade the requirements, how to achieve the high efficiency of power development has become a focus of power chip, which is also present papers to be studied in depth direction.This paper designed a BOOST DC-DC converters which using current-mode PWM control, the normal operating frequency of 200 KHz, the input voltage range from 1.1 V to 3.2V, with 0.8V startup, under the normal conversion efficiency up to 90 percent, the first article introduced the DC-DC converters work And the basic principles of design requirements, in-depth analysis of the system peak current mode PWM DC-DC, And show the advantages and disadvantages compared to voltage mode PWM DC-DC, and then introduced principles of system with the establishment of model, focused on the roles ramp wave of compensation play in the stability of the system .Then completed the design of the whole system of control loop systems modules, and then chip from the conversion of the main aspects of the loss, made a number of means to improve efficiency improvements. In particular the improvement of the current testing program, with a very low power consumption can be accurately detected the current of inductors, Simulation done with spectre in the environment of Cadence while design.Upon completion of modular system design, the use of these modules built into the system as a whole, the system simulation shows that the system could be work, and system design to meet targets. With low voltage startup, the efficiency has been greatly improved to meet the high efficiency of the BOOT converters demands.