Design of digital compensator for switching power supply
SHEN Xuzhen， WU Xiaobo，ZHAO Menglian, QIN Lin
(Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China)
Abstract:  Digital type of compenstor integrated in digital switched mode power supply(SMPS) controller can be implemented with more complicated control strategy to achieve high performance power manegement. Aiming at the large size problem of ordinary digital compensator, the digitalization of analog compensator of a Boost SMPS was analyzed. The design and optimization method of integrated digital compensator with nonlinear look up table was introduced, which was used to store the coefficient of the compensator. By the nonlinear look up table, the size was reduced and transient response was improved. The proposed architecture gains the features of small size, low power consumption, and it is easy to synthesis. The results based on field programmable gate array（FPGA） verification indicate that this compensator is suitable for digital SMPS.
Key words: digital switching power supply (SMPS) controller; digital compensator; nonlinear look up table; field programmable gate array （FPGA）