Buck型DC-DC变换器中单输入模糊控制器的设计与实现

提出了一种简化的用于数字控制DC-DC变换器的模糊控制算法——单输入模糊控制算法.通过在算法中引入符号距离法,将常规模糊控制算法中的2个输入简化为单个输入,从而使相应的模糊规则条数明显减少.在此基础上,采用FPGA设计了单输入模糊控制器,并进行了系统验证.测试结果表明,在输入电压为2.7～3.5V、输出电压为0.8～1.5V的Buck型DC-DC开关变换器中,系统的建立时间小于150 ms,稳态误差小于10 mV.与常规模糊控制器相比,这种单输入模糊控制器具有设计、调节和硬件实现简单等优势,因而有望在数字控制DC-DC变换器中得到广泛应用.

Design and implementation of single input fuzzy controller for Buck DC-DC converter

A simplified fuzzy control algorithm used for digitally controlled DC-DC converters,the single input fuzzy control algorithm,is proposed.In this algorithm,the signed distance method is introduced to simplify the two inputs in the conventional fuzzy control algorithm to a single input,making the number of the corresponding fuzzy rules significantly reduced.On this basis,the single input fuzzy controller is designed by the field-programmable gate array(FPGA),and the final verification is performed.The experimental results show that for the Buck DC-DC switching converter,when the input voltage is 2.7 to 3.5 V and the output voltage is 0.8 to 1.5 V,the set-up time is less than 150 ms and the steady-state error is less than 10 mV.Compared with the conventional fuzzy controller,the single input fuzzy controller has simpler hardware implementation in design,regulation and implementation.Therefore,it may be widely used in digitally controlled DC-DC converters.