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This paper presents a closed loop speed controi of a separately excited DC motor. A cascade combination of a diode bridge rectifier and single-ended primary inductor converter (SEPIC) is used to feed the DC motor from an AC supply. This circuit combination offers both step-up and step-down characteristics of the motor terminal voltage as well as an approximately sinusoidal supply current with an improved power factor. A fuzzy logic speed controller is used to overcome any system nonlinearity and parameter changes. Also. a wide range of both speed and load changes with satisfactory response is obtained. Two fuzzy membership functions are used reflecting few and simple control rules. Moreover. a genetic algorithm (GA) is used to optimally tune the fuzzy controller parameters. Simulation results of the system are obtained by solving the differential equations in different modes of operation. The system is laboratory implemented and the controller is investigated using a digital signal processing board (DSPI 104). The experimental and simulation results are verified and a correlation between both has been found. The results confirm the relevance of the proposed configuration aa useful rectifier that achieves sinusoidal supply current, high power factor and motor speed regulator. J,L 1 3 G i L d l U l + M I &i JALJI 2 ,Ul .. JF L$ $L + zj w! lie > A) c+ + J d l +GI 43 +ig-SIYl ~ Y p d 1 j41 lib . SEPlC egill i~. j + J I &L+ &dl + , & & ; +I &AS +I + Ji 4 &i ( dl&i .r~=.d~ I+ & *4i,+l , ~ i A ~ i L > ~ ~ ~ ~ l ~ & ~ l A ? l ~ l +I I & > + 4 i J i ~ & J + d 1 3 $UI 4; $ iij + h i L +LJI pW 1 _i?c &WI L+&$ r j &liIL, & d l 3,. r j . !d *I 2% u:l&l zj ."$I # +. .hi & liui f4 i L A l +.I\ J+A (genetic algorithm) G J I + 1 S zj .$WI lio 3 L-I ij;lpll , QI%i ' ! + ' $ ! d l ,IJ 2 J&I p a y ~ ~ m i l ~ i e ,IS.LI~ WI JS 2 ~ ~ 4 3 1 @I &. = zj -31 i j l >L.ql $L z l L l s I + . , c!+ + as . W l , &&I UJ& ' 2 (53j; .+-A @ ?.+I3 $UI slir 2 D S P l l 0 4 +I&,+ f +T~J&;,-d~ & J+l &iG! @!A1 > pJ L S ,++Is & U I & A&Z e3 L S ' W l .. @I 2 W I +Wl zl&Y +EL! 4L+i +Wl I L && LL+' I&, .ihJI &L+ W l .?li;ill lie LEL. ~li! pmicrocontroller

A SIMPLE FUZZY LOGIC SPEED CONTROLLER FOR A DC MOTOR FED BY SEPIC CONVERTER