Lub hauv paus ntsiab lus ntawm fais fab mov PWM tawm tswv yim tswj hom
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm PWM hloov tswj los yog tam sim no stabilized fais fab mov yog muab kaw-voj tawm tswv yim los ntawm qhov sib txawv ntawm cov teeb liab tswj thiab cov teeb liab siv nyob rau hauv kev tswj Circuit Court nyob rau hauv cov kev tshwm sim ntawm input voltage hloov, nyob rau hauv parameter hloov, los yog sab nraud load. Kev hloov pauv, los kho cov kev hloov pauv ntawm cov mem tes dav ntawm lub ntsiab hluav taws xob hloov hluav taws xob, kom ruaj khov cov zis hluav taws xob lossis tam sim no ntawm lub zog hloov hluav taws xob thiab lwm yam kev tswj cov teeb liab.
Basic Principles of Switching Power Supply pWM
Kev hloov pauv zaus ntawm pWM feem ntau yog tas li, thiab cov kev tswj cov qauv ntsuas muaj xws li: cov zis voltage, input voltage, tso zis tam sim no, tso zis inductance voltage, thiab ncov tam sim no ntawm lub switching ntaus ntawv. 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 qhov ruaj khov voltage, tam sim no, thiab lub zog tas li, thaum tseem ua tiav qee qhov haujlwm ntxiv xws li kev tiv thaiv overcurrent, tiv thaiv kev tsis ncaj ncees, thiab kev sib koom tam sim no. 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 hom phiaj tseem ceeb hauv pem hauv ntej tuaj yeem ua kom yooj yim los ntawm phaw chopper qhia hauv daim duab 1, thiab Ug sawv cev rau pWM tso zis tsav tsheb teeb liab ntawm kev tswj Circuit Court. Raws li qhov sib txawv pWM tawm tswv yim tswj hom xaiv, qhov input voltage Uin, tso zis voltage Uout, switching ntaus ntawv tam sim no (coj tawm ntawm point b), thiab inductance tam sim no (coj tawm ntawm point c los yog point d) nyob rau hauv lub Circuit Court yuav siv tag nrho. raws li sampling control signals. 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 xa ncaj qha mus rau pWM maub los. Kev ua haujlwm ntawm lub tshuab hluav taws xob ua haujlwm hluav taws xob (e / a) hauv daim duab 2 yog ob npaug: ① Amplify thiab tawm tswv yim qhov sib txawv ntawm qhov tso zis hluav taws xob thiab qhov muab hluav taws xob Uref kom ruaj khov hluav taws xob tswj qhov tseeb hauv lub xeev khov kho. DC amplification nce ntawm qhov kev ua haujlwm amplifier no yog qhov kev xav tsis kawg, tab sis qhov tseeb nws yog qhov qhib-voj amplification nce ntawm kev ua haujlwm amplifier Hloov lub teeb liab DC voltage nrog lub dav zaus band hloov suab nrov txuas nrog rau qhov kawg ntawm qhov hloov pauv lub ntsiab. rau hauv ib qho "huv" DC tawm tswv yim tswj teeb liab (Ue) nrog rau qee qhov amplitude, uas khaws cov DC tsawg zaus tivthaiv thiab ua rau cov AC high-frequency tivthaiv. Vim lub siab zaus thiab amplitude ntawm switching suab nrov, yog hais tias lub attenuation ntawm high-frequency switching suab nrov tsis txaus, cov lus qhia nyob rau hauv lub xeev yuav tsis ruaj khov; Yog hais tias lub high-frequency hloov suab nrov attenuation loj heev, dynamic teb yog qeeb. Txawm hais tias contradictory, lub hauv paus ntsiab lus tsim rau voltage yuam kev ua hauj lwm amplifiers yog tseem 'high low-frequency gain thiab low-frequency gain' Kho tag nrho kaw-voj system kom ruaj khov.
Switching power supply pWM yam ntxwv
1) Txawv pWM tawm tswv yim tswj hom muaj lawv tus kheej zoo thiab qhov tsis zoo. Thaum tsim cov khoom siv hluav taws xob hloov pauv, nws yuav tsum xaiv qhov tsim nyog pWM tswj hom raws li qhov xwm txheej tshwj xeeb.
2) Kev xaiv ntawm ntau hom kev tswj hwm pWM cov tswv yim yuav tsum tau ua ke nrog cov tswv yim tshwj xeeb thiab cov khoom siv hluav taws xob ntawm cov khoom siv hluav taws xob hloov hluav taws xob, cov khoom siv hluav taws xob tseem ceeb thiab kev xaiv cov khoom siv, cov suab nrov nrov ntawm cov zis hluav taws xob, thiab lub luag haujlwm hloov pauv ntau yam.
3) PWM tswj hom yog evolving thiab interconnected, thiab muaj peev xwm hloov mus rau hauv ib leeg nyob rau hauv tej yam kev mob.
