Hloov hom fais fab mov PWM tawm tswv yim tswj hom
PWM switching voltage regulator los yog tam sim no regulator fais fab mov lub hauv paus ntsiab lus ua hauj lwm yog hais tias nyob rau hauv cov ntaub ntawv ntawm input voltage hloov, nyob rau hauv parameter hloov, sab nraud load hloov, lub tswj Circuit Court los ntawm qhov sib txawv ntawm lub teeb liab tswj thiab siv lub teeb liab rau kaw-voj tawm tswv yim, kho qhov dav ntawm lub ntsiab circuit switching device conduction pulse, thiaj li hais tias cov zis voltage los yog tam sim no ntawm lub switching fais fab mov tso zis teeb liab stabilized los ntawm kev tswj teeb liab.
Hloov lub hwj chim mov pWM lub hauv paus ntsiab lus
Qhov hloov zaus ntawm pWM feem ntau yog qhov tsis tu ncua, thiab cov qauv tswj cov cim qhia yog: cov zis hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv tam sim no, cov zis hluav taws xob inductor, thiab qhov siab tshaj plaws tam sim no ntawm kev hloov khoom siv. Los ntawm cov teeb liab no tuaj yeem tsim ib lub voj voog, ob lub voj lossis ntau lub voj kev tawm tswv yim, kom ua tiav lub hom phiaj ntawm kev tswj qhov voltage, tam sim no thiab lub zog tas li, thiab tib lub sijhawm tuaj yeem paub txog qee qhov xwm txheej tiv thaiv overcurrent, tiv thaiv kev tsis ncaj ncees, sib npaug ntawm tam sim no. thiab lwm yam haujlwm. Tam sim no muaj tsib lub ntsiab pWM tawm tswv yim tswj hom.
Hloov fais fab mov pWM tawm tswv yim tswj hom
Feem ntau hais lus, lub ntsiab rau pem hauv ntej Circuit Court yuav siv tau los ua kom yooj yim lub phaw chopper qhia nyob rau hauv daim duab 1, Ug qhia tau hais tias tus tswj Circuit Court ntawm pWM tso zis tsav teeb liab. Raws li qhov kev xaiv ntawm pWM tawm tswv yim sib txawv tswj hom, Circuit Court input voltage Uin, output voltage Uout, switching device tam sim no (los ntawm point b), inductor tam sim no (los ntawm point c los point d) yuav siv tau raws li ib tug sampling tswj teeb liab. Thaum cov zis hluav taws xob Uout siv los ua lub teeb liab tswj kev ntsuas, nws feem ntau ua tiav los ntawm lub voj voog uas pom hauv daim duab 2 kom tau txais cov teeb liab voltage Ue, uas yog tom qab ntawd ua tiav lossis pub ncaj qha rau pWM maub los. Lub luag haujlwm ntawm lub tshuab hluav taws xob ua haujlwm hluav taws xob (e / a) hauv daim duab 2 yog peb zaug: (1) kom nthuav dav thiab tawm tswv yim qhov sib txawv ntawm qhov tso zis hluav taws xob thiab qhov muab hluav taws xob Uref los xyuas kom meej qhov tseeb ntawm kev tswj hluav taws xob hauv lub xeev khov kho. Lub DC amplification nce ntawm op-amp yog theoretically infinite, uas yog qhov qhib-voj amplification nce ntawm op-amp. ② yuav hloov lub ntsiab lus tso tawm nrog lub broadband hloov suab nrov ntawm DC voltage teeb liab mus rau hauv ib qho amplitude ntawm DC tawm tswv yim tswj teeb liab (Ue) yog qhov "huv" uas yog, khaws cov DC tsawg zaus cov khoom, attenuation ntawm AC high-frequency Cheebtsam. Vim hais tias qhov hloov suab nrov ntawm ntau zaus, amplitude, high-frequency switching suab nrov attenuation tsis txaus, ces lub xeev cov lus tawm tswv yim tsis ruaj khov; high-frequency switching suab nrov attenuation loj heev, ces cov dynamic teb yog qeeb. Txawm hais tias contradictory, tab sis lub hauv paus ntsiab lus tsim qauv ntawm qhov kev ua haujlwm tsis zoo ntawm lub tshuab hluav taws xob tseem yog "tsawg zaus nce yuav tsum siab, qhov nce siab yuav tsum qis. ruaj khov.
Switching power supply pWM yam ntxwv
1) txawv pWM tawm tswv yim tswj hom muaj nws tus kheej zoo sib txawv thiab qhov tsis zoo, nyob rau hauv kev tsim ntawm switching fais fab mov xaiv yuav tsum tau raws li tej yam kev mob ntawm kev xaiv ntawm lub tsim nyog pWM tswj hom.
2) Kev xaiv ntau hom kev tswj hwm pWM cov lus tawm tswv yim yuav tsum tau ua ke nrog kev txiav txim siab ntawm qhov tshwj xeeb hloov hluav taws xob cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, cov khoom siv hluav taws xob tseem ceeb thiab kev xaiv cov khoom siv, cov zis hluav taws xob ntawm lub suab nrov loj, lub luag haujlwm hloov pauv. ntau.
3) pWM tswj hom yog txoj kev loj hlob ntawm kev hloov, yog interconnected, nyob rau hauv tej yam kev mob yuav hloov mus rau ib leeg.
