Ukwethulwa kokushintsha ubuchwepheshe besekethe ye-adaptha yamandla ku-TV

1, Isingeniso;

Ukushintsha ukunikezwa kwamandla kunezinzuzo ezisobala ezifana nokusetshenziswa kwamandla okuphansi, ukusebenza kahle okuphezulu kanye nevolumu encane. Isetshenziswe kabanzi emikhiqizweni kagesi nasezinsizeni zikagesi. Ngokwemodi yokulawula ukuzinza kwe-voltage okukhiphayo wesekethe, ukunikezwa kwamandla okushintshwa kungahlukaniswa ngezinhlobo ezintathu: i-pulse wide modulation (PWM), i-pulse frequency modulation (PFM) kanye ne-pulse rate modulation (PWM). Ngokwemodi ye-trigger, ukunikezwa kwamandla okushintshwa kungahlukaniswa ngohlobo oluzithokozisayo kanye nolunye uhlobo olujabulile, I-adaptha yamandla yokushintsha echazwe kulesi sihloko i-pulse width modulation (PWM). Kungugesi oshintshayo othokozisayo, okhipha amandla kagesi alawulwayo angu-12V DC avame ukusetshenziswa emikhiqizweni kagesi nezinto zikagesi, kanti amandla amanje alinganiselwe ngu-6A. Ilungele ukufakwa kwamandla kagesi we-DC we-LCD TV phakathi kwamayintshi angu-32.

2, Incazelo yobuchwepheshe yomjikelezo wokushayela wokushintsha i-adaptha yamandla;

I-drive chip ob2269 esetshenziswe ekushintsheni kukagesi okuchazwe kulesi sihloko yamukela isikimu sokuklama esiyingqayizivele, okungukuthi uhlelo lokuphakela amandla lunokusebenza kwezindleko eziphezulu futhi lungahlangabezana nezidingo zoquqaba.

I-Ob2269 yamukela idizayini yemodi yamanje yendabuko futhi inezici ezilandelayo;

▲ ukusetshenziswa kwamandla okulindile okuphansi: idizayini yemodi yokusebenza yesikhashana enamandla aphansi ayikwazi nje ukwenza lonke uhlelo lube lula ukuthola izincomo zakamuva ze-International Energy Agency ngaphansi komthwalo.

▲ ukusebenza kwamahhala: umsindo womsindo ngeke uvele ngaphansi komthwalo omncane nomthwalo ogcwele. Idizayini yesistimu ethuthukisiwe ingenza isistimu isebenze ngokuthula kunoma yisiphi isimo sokusebenza.

▲ Amandla okuqala aphansi: I-VIN / VDD yokuqala yamanje iphansi njenge-4ua, enganciphisa ngempumelelo ukulahlekelwa kwesistimu yokuqalisa isifunda futhi ifinyeze isikhathi sokuqala kwesistimu.

▲ ukusebenza okuphansi kwamanje: ukusebenza kwamanje kumayelana ne-2.3ma, okunganciphisa ngempumelelo ukulahlekelwa kwesistimu futhi kuthuthukise ukusebenza kahle kwesistimu.

▲ eyakhelwe ku-OCP isinxephezelo: umsebenzi wokunxeshezelwa owakhelwe ngaphakathi we-OCP wenza ijika le-OCP lesistimu lithande ukuba sicaba kulo lonke uhla lwamandla kagesi ngaphandle kokunyusa izindleko, ukuze kuthuthukiswe ukusebenza kwezindleko zohlelo.

▲ umsebenzi wokuvikela umsindo: unomsebenzi wokuvikela ugesi ngokweqile (OVP), umsebenzi wokuvikela izinga lokushisa ngaphezulu (OTP), umsebenzi wokuvikela i-undervoltage (UVLO) nomsebenzi wokuvikela ukulayisha ngokweqile (OLP), kuhlanganiswe nomsebenzi wokuvikela umsindo.

▲ Idrayivu ethambile ye-MOSFET: ingathuthukisa ngempumelelo i-EMI yohlelo.

Izici ezingu-2269 zesistimu eyakhelwe ngaphakathi: inganciphisa ngempumelelo i-EMI futhi yehlise i-EMI.

3, Umdwebo kagesi wohlelo lokushintsha i-adaptha yamandla;