Ihlinzeka nge-voltage engu-3.3V ohlelweni lwesekethe ngebhethri ye-lithium, futhi inomsebenzi wokushaja kwe-USB nokugcinwa kwe-charge egcwele.

Ukushaja kwe-USB kukhetha isekethe ye-chip ye-TP4056 ukuze iqedelwe. I-TP4056 ishaja yebhethri ye-lithium-ion eneseli elilodwa elizinzile/elizinzile le-voltage linear charger. Isakhiwo se-PMOSFET sikhethwa ngaphakathi futhi sihlanganiswe nesifunda sokushaja esiphikisana nokuhlehla, ngakho-ke akukho diode yokuhlukanisa yangaphandle edingekayo. Impendulo eshisayo ingalungisa imanje ukushaja ukuze ibambezele izinga lokushisa le-chip ngaphansi kokusebenza kwamandla aphezulu noma izimo zokushisa eziphakeme ze-ambient. I-voltage yokushaja izinzile ku-4.2V, futhi amandla okushaja angasethwa ngaphandle nge-resistor. Lapho ukushaja kwamanje kufinyelela ingxenye eyodwa kweshumi yenani elimisiwe ngemva kokufinyelela i-voltage yokugcina yokushaja, i-TP4056 izomisa ngokugcwele umjikelezo wokushaja.

Uma ingekho i-voltage yokufaka, i-TP4056 ingena ngenkuthalo esimweni samanje esiphansi, inciphisa ukuvuza kwamanje kwebhethri ibe ngaphansi kuka-2uA. I-TP4056 ingaphinda ibekwe kumodi yokuvala shaqa uma kukhona ugesi, kunciphisa ukunikezwa kwamandla ku-55uA. Incazelo yephinikhodi ye-TP4056 ikhonjiswe kuthebula elilandelayo.

Umdwebo wesekethe yokushaja i-USB imi kanje:

Ukuhlaziywa kwesifunda: I-Header2 iyitheminali yokuxhuma, futhi i-B+ ne-B_ zixhunywe ngokuhlukana ezigxotsheni ezinhle nezingezinhle zebhethri ye-lithium. I-Pin 4 kanye ne-Pin 8 ye-TP4056 zixhunywe ku-USB amandla kagesi kagesi angu-5V, futhi i-Pin 3 ixhunywe ku-GND ukuze kuqedelwe ukunikezwa kwamandla nokunika amandla chip. Xhuma iphinikhodi engu-1 TEMP ku-GND, vala umsebenzi wokuqapha izinga lokushisa kwebhethri, iphinikhodi engu-2 PROG xhuma i-resistor R23 bese uxhuma ku-GND, ukushaja kwamanje kungalinganiselwa ngokuya ngefomula elandelayo.

I-BAT yamaphini angu-5 inikeza amandla okushaja amanje kanye ne-voltage yokushaja engu-4.2V ebhethrini. Izibani zezinkomba i-D4 ne-D5 zisesimweni sokudonsela phezulu, okubonisa ukuthi ukushajwa kuqediwe futhi ukushajwa kuyaqhubeka. Izokhanya uma iphinikhodi yokuxhumeka iphansi. I-Pin 6 STDBY ihlezi isesimweni sokungasebenzi kahle ngesikhathi sokushajwa kwebhethri. Ngalesi sikhathi, i-D4 icishiwe. Lapho ukushaja sekuqediwe, idonselwa phansi iye ezingeni eliphansi ngokushintsha kwangaphakathi. Njengamanje, i-D4 ivuliwe, okubonisa ukuthi ukushaja kuqediwe. Ngokuphambene, kuphrojekthi yokushaja ibhethri, iwashi le-CHRG lisezingeni eliphansi uma uphini ongu-7 likhanyisiwe, futhi i-D5 ivuliwe ngalesi sikhathi, okubonisa ukuthi iyashaja. Lapho ukushaja sekuqediwe, kusesimweni sokuvinjelwa okuphezulu, futhi i-D5 icishiwe ngalesi sikhathi.

Isekhethi yebhethri ye-lithium kanye nesekhethi yokulungisa i-overdischarge ikhetha i-chip ye-DW01 futhi isebenzisane ne-MOS tube 8205A ukuze iqedele. I-DW01 iyisiphakeli sesekhethi yebhethri ye-lithium enokuqapha okunemba okuphezulu kwama-voltage kanye namasekethe okulibaziseka kwesikhathi. Incazelo yephinikhodi ye-DW01 chip ikhonjiswe kuthebula elingezansi.

I-8205A iwumthombo ojwayelekile we-N-channel wamandla athuthukisiwe we-FET, olungele ukugcinwa kwebhethri noma amasekhethi ashintshwayo ane-voltage ephansi. Isakhiwo sangaphakathi se-chip siboniswa esithombeni esingezansi.

Isekhethi yokushaja ibhethri ye-lithium nokugcinwa kwayo iboniswa esithombeni esingezansi.

Ukuhlaziywa kwesifunda: I-Header3 iyiswishi yokuguqula ukuze ulawule ukuthi kusetshenziswa amandla ebhethri ye-lithium.

Ukusebenza okuvamile kwebhethri ye-lithium: Uma ibhethri ye-lithium iphakathi kuka-2.5V no-4.3V, womabili amaphinikhodi angu-1 no-3 we-DW01 okukhipha izinga eliphezulu, futhi i-voltage ye-pin 2 ingu-0V. Ngokomdwebo wohlelo lwe-8205A, iphinikhodi 1 kanye nephinikhodi 3 ye-DW01 zixhunywe ngokuhlukene kuphini 5 kanye nophini 4 ka-8205A. Kuyabonakala ukuthi womabili ama-MOS transistors ayasebenza. Kulo mzuzu, isigxobo esinegethivu sebhethri ye-lithium sixhunywe endaweni yokunikeza amandla P_ yesifunda se-microcontroller, futhi ibhethri ye-lithium ijwayelekile. inikezwe amandla yi.

Ukulawulwa kokushajwa kwe-lithium: Uma ibhethri ye-lithium ishajwa ngomjikelezo we-TP4056, amandla ebhethri ye-lithium azonyuka njengoba isikhathi sokushaja sikhula. Lapho i-voltage yebhethri ye-lithium ikhuphukela ku-4.4V, i-DW01 icabanga ukuthi i-voltage yebhethri ye-lithium isivele isesimweni sokukhokhiswa ngokweqile, futhi ngokushesha isebenzise i-pin 3 ukuze ikhiphe i-0V, kanti i-8205A chip G1 ayinawo amandla kagesi, okubangela ishubhu ye-MOS. ukumisa. Ngalesi sikhathi, ibhethri ye-lithium B_ ayixhunyiwe kugesi wesifunda P_ we-single-chip microcomputer, okungukuthi, isifunda sokushaja sebhethri ye-lithium sivinjiwe, futhi ukushaja kumisiwe. Nakuba ishubhu yokushintsha i-overcharge control ivaliwe, isiqondiso se-diode yayo yangaphakathi ifana nesekhethi yokukhipha, ngakho-ke lapho umthwalo wokukhipha uxhumeke phakathi kwe-P + ne-P_, usengakhishwa. Lapho i-voltage yebhethri ye-lithium ingaphansi kuka-4.3V, i-DW01 imisa isimo sokugcinwa kwe-overcharge. Ngalesi sikhathi, ibhethri ye-lithium B_ ixhunywe kumandla we-P_ wesifunda se-microcontroller, futhi ukushaja okujwayelekile nokukhishwa kwenziwa futhi.

Ukulawula ukugcinwa kokukhipha ngokweqile: Uma ibhethri ye-lithium ikhishwa ngomthwalo wangaphandle, i-voltage yebhethri ye-lithium izokwehla kancane. I-DW01 ithola i-voltage yebhethri ye-lithium nge-resistor engu-R26. Lapho i-voltage yehla ifika ku-2.3V, i-DW01 icabanga ukuthi i-lithium battery voltage isivele isesimweni se-voltage yokukhipha ngokweqile, futhi ngokushesha isebenzise iphinikhodi 1 ukuze ikhiphe u-0V, futhi i-chip ye-8205A G2 ayinawo amandla okwenza ishubhu ye-MOS ime. Ngalesi sikhathi, ibhethri ye-lithium B_ ayixhunyiwe kugesi wesifunda P_ we-single-chip microcomputer, okungukuthi, isifunda sokukhishwa kwebhethri ye-lithium ivinjiwe, futhi ukukhishwa kumisiwe. Uma ixhunywe kusekethe ye-TP4056 ukuze ishaje, ngemva kokuthi i-DW01 ithole i-voltage yokushaja nge-B_, ilawula iphinikhodi 1 ukuze ikhiphe izinga eliphezulu. Kulo mzuzu, ibhethri ye-lithium B_ ixhunywe kumandla we-P_ wesekethe ye-microcontroller, futhi ukushaja okuvamile nokukhishwa kwenziwa futhi.