Buck-boost type controller inowedzera nguva yekushanda yechishandiso cheruoko

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - ተንቀሳቃሽ የኃይል ጣቢያ አቅራቢ

Background Iine diki, high-energy density yemazuva ano bhatiri tekinoroji, yakakwirira-inoshanda, yakakwirira-inoshanda, yakakwirira-simba, yakakwirira-simba density, yakakwirira-inoshanda. Izvi zvinopa dambudziko rekugadzira kune 3.3V bhazi voltage, system inofambiswa ne lithium ion uye lithium polymer bhatiri.

Kunyanya, iyo 3.3V bhazi voltage inopihwa ine mutoro ikozvino mukuru kupfuura 0.5A, kunyangwe.

Kunyangwe iyo buck converter yakanyatso kushandurwa kuita yakaderera kubuda voltage (eg 1.8V) ine lithium-ion bhatiri voltage ye2.7-4.

2V, iyo inosimudzira inoshandura inogona kunyatsobuda magetsi (eg 5V), asi ese maconverter haawanzo kuoneka 3.3V bhazi voltage. Imwe-inopera main Inductor Converter (Sepic), iyo topology yakadai seyekusimudzira uye buck inoshandura inogona kushandisa ese simba rebhatiri, asi ine yakaderera inoshanda, inodhura zvakanyanya, dhipoziti nzvimbo, uye mamwe maturusi uye yakaoma Yakanyanya kusaipa.

Imwe kana maviri mabhatiri e-lithium ion anowanzo kuchaja ne5 kusvika 9V AC adapta. Kugona kutsiva bhatiri zvakananga neiyo AC adapta, kupfupisa bhatiri yekuchaja nguva. Ehe, izvi zvinoda kuti inoshandura haingoshande payakaderera bhatiri yekuisa voltage, asi zvakare kushanda neyakakwirisa yekupinza voltage.

Sechinyakare, chibatiso cheruoko chinofambiswa nebhatiri chinokweva simba kubva mubhatiri, kunyangwe mukuchaja bhatiri. Iyi mhando yeDC / DC inoshandura zvakare ine yakadzika kwazvo quiescent ikozvino kuchengetedza bhatiri simba mukumira kana idle mode. Synchronous buck-boosting controller ndiyo yakanaka mhinduro yekupa 3.

3V magetsi njanji mumidziyo inobatwa nemaoko iyo inofambiswa ne-single-cell lithium-ion bhatiri. 3.3V njanji yemagetsi idambudziko rakaoma.

Makambani mazhinji akapa mhinduro. Linglurt&39;s LTC3785 Synchronous buck-boost type switching regulator DC / DC controller ndomumwe wavo. Iyo proprietary buck-boost topology ine chete inductor, iyo inogona kushandisa yakagadziriswa inobuda voltage yakakwira kupfuura, yakaenzana kana kudzika pane yekupinza voltage yeinobuda voltage.

LTC3785 inoshanda nekupinza uye kubuda voltages 2.7 kusvika 10V, iyo yakakodzera kune imwechete kana maviri lithium ion kana lithium polymer mabhatiri, kana akawanda-alkaline nickel-hydrogen simbi, nickel cadmium kana alkaline mabhatiri. Iyi yakanyatsobatanidzwa controller inoshandisa diki fiberly, iine akawanda anorongwa mabasa, akadai seakapfava bhutsu, switching frequency, uye kumisa chikumbaridzo voltage.

Iyo yekugonesa curve iri mukuwiriranisa, 4 switch buffet-boost-boost DC / DC inoshandura, ine 2.7 ~ 10V yekupinza voltage, 3.3V / 3A kugadzirisa mukubudirira kusvika ku96% Kubuda.

Iyo LTC3785 inopa ese N-channel MOSFET madhiraivha emagedhi kuti ape zviri nyore kushandisa yakaderera RDS (ON) imwe pasuru yakawanda-simba switch tekinoroji. Yayo proprietary topology uye kutonga kwekuvaka kunoshandisa MOSFET RDS kuona kumberi uye kudzosera kumashure kudzikamisa kwazvino, kuwana kusingaenzaniswi kwepamusoro kunyatsoshanda. Paunenge uchida kuwedzera iko zvino kudzikamisa kurongeka, unogona kushandisa yekuona resistor.

Pamusoro pezvo, iyo LTC3785 inogona kushanda muburstmode, ichidzika pasi static ikozvino yemutoro wemwenje kusvika isingasviki 100μA, iyo yakakosha pakuwedzera bhatiri rekushandisa nguva yezvinotakurika application. Iyo LTC3785 zvakare ine chaiyo yekubuda yekubvisa kugona panguva yekudzikira, kuve nechokwadi kubviswa kwebhatiri uye system mutoro. Mufananidzo 1 Nhanho-kudzvanya-inosimudzira inoshandura schematic uye kugona kwayo curve advanced control topology kunyatsoshanda LTC3785 zvichibva pane yakajairwa H bhiriji-inosimudzira simba nhanho, sezvakaratidzwa mumufananidzo 2.

Iyo zvakare ine buck uye boost switch MOSFET, iyo inobatanidza kune imwechete inductor. Kuvhura ese 4 MOSFETs neinoenderera panguva imwe chete switch - Different boost mode, LTC3785 yakagadzirwa, maviri chete MOSFETs nguva imwe neimwe. Mazhinji buck-boost control maseketi akanyatso kudzika munzvimbo dzekutendeuka, simba jitter kana kubuda voltage matambudziko asina kugadzikana.

Nekudaro, iyo LTC3785 inoshandura isina musono pakati pekutsika-pasi, buck-boost uye inosimudzira nzvimbo yekushandira, inochengetedza yakaderera ruzha kuita mune ese anoshanda modes. Iyi dunhu rekutonga zvakare inoderedza zvakanyanya kusingakodzeri switch uye conduction kurasikirwa, kuwedzera kugona kwevashanduri. Mufananidzo 2 Simba rekupa chikamu chevhavha dhiyagiramu uye iyo inoshanda mode yekushandisa mode yekuisa voltage yakakwira kupfuura yakabuda voltage, inoshandura inoshanda, chinja A uye B shanduko yekuisa voltage, switch D inovhurwa, iyo L1 yakabatana kune inobuda (ona Mufananidzo 2).

Sezvo magetsi ekupinza akaderedzwa uye achiswedera pedyo nemhepo inobuda, inoshandura iri padyo nepamusoro pebasa rekutenderera kweiyo buck modhi, chikamu chekusimudzira chebhiriji chinotanga switch, kupinda mubuck-boost kana 4 switching work area. Sezvo magetsi ekupinza ari kuwedzera kuderedzwa, inoshandura inopinda munzvimbo yekusimudzira. Shandura A inobatidzwa pane yakaderera boost duty cycle, iyo inductor yakabatana kune yekuisa, switch C, uye D shanduko yedivi rekubuda reinductor pakati peinobuda capacitor uye pasi, seyakafanana inosimudzira inoshandura.

Mamwe mabasa ekuwana kuchinjika kwepamusoro LTC3785 Pane mamwe mabasa ekuvandudza kuwanikwa kwawo mumashandisirwo anotakurika, semuenzaniso, yakanyanya kuderera static ikozvino kuwedzera bhatiri maawa ekushanda. Kune akadai anotakurika maapplication, mudziyo unogona kugadzirwa kuti ushande mu burst mode kuti uwedzere bhatiri maawa ekushanda. Mune kuputika modhi, iyo LTC 3785 inopa simba kune inobuda kusvika iyo inobuda voltage yasvika panzvimbo yakatsiga.

Mushure mokusvika panzvimbo yakagadzikana, chigadziro chinoiswa munzvimbo yekurara, uye kutyaira kweMOSFET yekunze kunodzimwa, uye chete dunhu rakakosha rinochengetwa, uye LTC3785 inoshandisa zvishoma kudarika 100μA ikozvino. Ikozvino mutoro unopihwa neinobuda capacitor panguva ino. Kana iyo yakabuda voltage inodonha pazasi yakaderera voltage regulatory edge, mudziyo "unomuka" uye wotanga kushandura basa zvakare, uye inobuda capacitor inochajwa zvakare.

LTC3785 inopawo kuwandisa uye kupfupika kwedziviriro yedunhu nekuona uye kudzikisira iyo yekupinda ikozvino kubva kune yekupinza magetsi. Kana iyo mushandisi chirongwa chemuganho kukosha chasvikwa, iyo yakapfava yekutanga capacitor yakabatana neRUN / SS pini inoshandiswa zvakare kushandisa yekukanganisa press uye kutanga kuburitsa. Kana iyo yazvino yekumisikidza mamiriro ikaenderera kwenguva yakareba, inoshandura ichavharwa ichitanga kudzvanya reset kuti utangezve shanduko.

Kana iyo LTC3785 isingakwanise kutangazve, uye mamiriro ekuremedza achienderera mberi, iyi modhi yekushanda icharamba ichidzikamisa simba rose rekushandisa. Nekupa diki ikozvino kuRUN / SS pini, unogona zvakare kukiya kiyi yemudziyo pachinzvimbo chekutanga otomatiki. Nekuda kwekuchinja kwekunze kweMOSFET kuramba, MOSFET yekuona kuvuza kazhinji haina kunyatso kurongeka.

Kana iwe uchida zvakanyanya kuomesesa ikozvino kudzikamisa kurongeka, unogona kuwedzera ikozvino yekuona kuramba. LTC3785 inogonawo kurongerwa kuti iite basa rakazara rekubvumira maconverters kuti ape uye atore mafungu akaenzana neazvino kuyerera kuseta mapoinzi. Izvi zvinowanikwa nekuona yakakwira logic level chiratidzo papini yeCCM.

Yemukati P-channel low pressure difference regulator ine input power supply voltage muVCC pini 4.35V voltage. Iyi voltage inofambiswa nedhiraivha uye LTC 3785 yemukati wedunhu, iyo inogona kupa 100 mA peak ikozvino, iyo inofanirwa kupfuura iyo capacitor ine hushoma hwe4.

7μF. Iyo VCC regulator inogona kubatana neVout neSchottky diode kuti ipe yakakwirira gedhi drive mafungu. Chekupedzisira, iyo LTC3785 ine overvoltage uye undervoltage mabasa ekutadza kudzivirira uye zvirambidzo zvenguva pfupi.

Kana iyo voltage inobuda ikaonekwa ne 9.5% yakakwira pane inotangwa voltage regulation point, ipapo switch inomira. Iyo inobuda voltage inozoderedzwa kusvika padanho rakachengeteka nekuti hapana simba rekupa kune inobuda.

Kamwe kuburitsa kwave kuderera zvakakwana, chiito chekuchinja chinotanga zvakare. Munyaya ye overvoltage, iyo yakabatanidzwa yedunhu iri kushanda nesimba mune yakatarwa frequency mode, uye iyo kuputika modhi inorambidzwa. N chiteshi simba MOSFET kusarudzwa uye mhinduro saizi LTC3785 kune 4 ekunze N-chiteshi simba MOSFETs, maviri ekumusoro switch, uye zvimwe zviviri zviratidzo.

Iwo akakosha ma paramita ndeeVBR (DSS), VGS (TH), RDS (ON) uye IDS (MAX). Dhiraivha voltage 4.35VVCC magetsi kuseta.

Kune akawanda ekuisa voltages, yakaderera logic gedhi zvikumbaridzo MOSFETs inogona kushandiswa kune maapplication uko akawanda ekuisa voltages ari pasi pe5V. Uye zvakare, akajairwa LTC3785DC / DC anoshandura ese anoshandisa ceramic kupinza uye kubuda capacitors. Iyo 10W inoburitsa yakazara redunhu dhipoziti nzvimbo isingasviki 2cm2cm, iyo inductor ndiyo yepamusoro mudziyo, kureba i0.

32cm. .