3-A Synchronous Step-Down Voltage Converter Integrated dera IC LMR33630BQRNXRQ1

1.

Ntchito ya buck converter ndikuchepetsa mphamvu yolowera ndikuyifananitsa ndi katundu.Ma topology oyambira osinthira buck amakhala ndi chosinthira chachikulu ndi chosinthira cha diode chomwe chimagwiritsidwa ntchito panthawi yopuma.MOSFET ikalumikizidwa molumikizana ndi diode yopitilira, imatchedwa chosinthira cha buck synchronous.Kuchita bwino kwa mawonekedwe osinthira a tonde ndi apamwamba kuposa a otembenuza a tonde akale chifukwa cha kulumikizana kofanana kwa MOSFET yotsika ndi diode ya Schottky.Chithunzi 1 chikuwonetsa chosinthira cha buck cha synchronous, chomwe ndi mawonekedwe omwe amagwiritsidwa ntchito kwambiri pamakompyuta apakompyuta ndi ma notebook masiku ano.

2.

Njira yowerengera yoyambira

Ma transistor switch Q1 ndi Q2 onse ndi N-channel mphamvu MOSFETs.ma MOSFET awiriwa nthawi zambiri amatchedwa masiwichi apamwamba kapena otsika ndipo MOSFET yotsika imalumikizidwa limodzi ndi diode ya Schottky.Ma MOSFET awiriwa ndi diode amapanga njira yayikulu yosinthira mphamvu.Kutayika mu zigawozi ndi gawo lofunika la zotayika zonse.Kukula kwa linanena bungwe LC fyuluta akhoza anatsimikiza ndi ripple panopa ndi ripple voteji.Kutengera ndi PWM yomwe imagwiritsidwa ntchito pamwambo uliwonse, ma network resistor resistor network a R1 ndi R2 amatha kusankhidwa ndipo zida zina zimakhala ndi magwiridwe antchito oyika magetsi otulutsa.PWM iyenera kusankhidwa molingana ndi kuchuluka kwa mphamvu komanso magwiridwe antchito pamafupipafupi omwe akufunidwa, zomwe zikutanthauza kuti ma frequency akuwonjezeka, pakufunika kukhala ndi mphamvu zokwanira zoyendetsera zipata za MOSFET, zomwe zimapanga chiwerengero chochepa cha zigawo zofunika. kwa muyezo synchronous buck Converter.

Wopangayo ayenera kuyang'ana kaye zofunikira, mwachitsanzo, V kulowetsa, V kutulutsa ndi I zotulutsa komanso zofunikira za kutentha kwa ntchito.Zofunikira izi zimaphatikizidwa ndikuyenda kwa mphamvu, ma frequency, ndi kukula kwa thupi zomwe zapezedwa.

3.

Udindo wa buck-boost topology

Buck-boost topologies ndi othandiza chifukwa magetsi olowera amatha kukhala ang'onoang'ono, okulirapo, kapena ofanana ndi voteji pomwe amafunikira mphamvu yotulutsa kuposa 50 W. Kwa mphamvu zotulutsa zosakwana 50 W, chosinthira choyambirira chomaliza (SEPIC) ) ndi njira yotsika mtengo chifukwa imagwiritsa ntchito zigawo zochepa.

Zosintha za Buck-boost zimagwira ntchito mumtundu wa buck pomwe voteji yolowera ndi yayikulu kuposa voliyumu yotulutsa komanso munjira yolimbikitsira pomwe magetsi olowera ndi ocheperako.Pamene chosinthira chikugwira ntchito m'chigawo chotumizira kumene magetsi olowera ali mumtundu wa voteji, pali mfundo ziwiri zothanirana ndi izi: mwina masitepe a buck ndi boost akugwira ntchito nthawi imodzi, kapena ma switching amasinthana pakati pa buck. ndi kulimbikitsa masitepe, iliyonse nthawi zambiri imagwira ntchito pa theka la ma frequency osinthika.Lingaliro lachiwiri likhoza kuyambitsa phokoso laling'ono la harmonic pazotulutsa, pamene kulondola kwa voteji kungakhale kochepa kwambiri poyerekeza ndi buck wamba kapena ntchito yowonjezera, koma chosinthiracho chidzakhala chothandiza kwambiri poyerekeza ndi lingaliro loyamba.