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PID控制的Buck變換器，雖然能夠運(yùn)行，但感覺有諸多問題，望大蝦幫小弟瞅瞅！

buck_experiment     這個(gè)模型是按照書上例題的參數(shù)和結(jié)構(gòu)在saber里面搭建的，書上設(shè)計(jì)的輸出電壓是12V，但實(shí)際運(yùn)行的接近24V，并且改變參考電壓對輸出電壓值沒有什么影響，還有改變?nèi)禽d波的幅值對輸出的電壓也沒什么影響，希望有人能幫我檢查，解釋下。非常感謝！

    

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z_yang
LV.2
2
2012-04-17 16:16

your circuit works well after changes the amplitude of OSC.

It worked under the condition as you described just because the loop had not work at all (you can see that the output of EA always zero), so after I changed the OSCs amplitude , the loop is working well

 

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z_yang
LV.2
3
2012-04-17 16:45
@z_yang
yourcircuitworkswellafterchangestheamplitudeofOSC.Itworkedundertheconditionasyoudescribedjustbecausetheloophadnotworkatall(youcanseethattheoutputofEAalwayszero),soafterIchangedtheOSCsamplitude,theloopisworkingwell[圖片] 

AND I CHANGED THE VREF TO 10v, then the Vout=20 as RF1=RF2=100K


 

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