Kuyambitsa ukadaulo wosinthira ma adapter amagetsi pa TV

1, Chiyambi;

Kusintha magetsi kumakhala ndi ubwino woonekeratu monga kugwiritsira ntchito mphamvu zochepa, kugwiritsira ntchito bwino kwambiri komanso kuchuluka kwazing'ono. Zakhala zikugwiritsidwa ntchito kwambiri pazinthu zamagetsi ndi zipangizo zamagetsi. Malinga ndi njira yoyendetsera magetsi yoyendetsera dera, magetsi osinthira amatha kugawidwa m'mitundu itatu: pulse wide modulation (PWM), pulse frequency modulation (PFM) ndi pulse rate modulation (PWM). Malinga ndi njira yoyambitsa, kusinthira magetsi kumatha kugawidwa kukhala mtundu wodzisangalatsa komanso mtundu wina wosangalatsa, Adaputala yamagetsi yosinthira yomwe yafotokozedwa m'nkhaniyi ndikusintha kwamtundu wa pulse (PWM). Ndi mphamvu yosinthira yosangalatsa, yomwe imatulutsa voteji yoyendetsedwa ndi 12V DC yomwe imagwiritsidwa ntchito kwambiri pazinthu zamagetsi ndi zida zamagetsi, ndipo zomwe zidavotera pano ndi 6A. Ndikoyenera kuyika magetsi a DC a LCD TV mkati mwa mainchesi 32.

2, Kufotokozera zaukadaulo za kuyendetsa dera losinthira adaputala yamagetsi;

The drive Chip ob2269 yomwe imagwiritsidwa ntchito posinthira magetsi yomwe yafotokozedwa m'nkhaniyi itengera dongosolo lapadera, lomwe ndilakuti makina opangira magetsi amakhala ndi mtengo wokwera kwambiri ndipo amatha kukwaniritsa zofunikira za anthu ambiri.

Ob2269 imatengera kapangidwe kakale kamakono ndipo ili ndi izi;

▲ kugwiritsira ntchito mphamvu zotsika: kamangidwe kameneka kamene kamakhala ndi mphamvu zochepa sikungopangitsa kuti dongosolo lonse likhale losavuta kuzindikira zomwe bungwe la International Energy Agency limapereka popanda katundu.

▲ ntchito yopanda phokoso: phokoso la audio silidzawoneka pansi pa katundu wopepuka komanso katundu wathunthu. Kapangidwe kadongosolo kamene kakhoza kupangitsa kuti dongosolo lizigwira ntchito mwakachetechete m'malo aliwonse ogwira ntchito.

▲ m'munsi poyambira pano: VIN / VDD yoyambira pano ndiyotsika ngati 4ua, yomwe imatha kuchepetsa kutayika kwa dongosolo loyambira ndikufupikitsa nthawi yoyambira.

▲ ntchito yotsika: yomwe ikugwira ntchito ili pafupi ndi 2.3ma, yomwe ingachepetse kutayika kwa dongosolo ndikuwongolera magwiridwe antchito.

▲ yomangidwa mu chiwongoladzanja cha OCP: ntchito yolipirira OCP yomangidwa imapangitsa kuti OCP curve ya dongosololi ikhale yathyathyathya mumtundu wonse wamagetsi popanda kuonjezera mtengo, kuti apititse patsogolo mtengo wadongosolo.

▲ ntchito yoteteza mawu: ili ndi ntchito yoteteza kwambiri (OVP), ntchito yoteteza kutentha (OTP), ntchito yachitetezo cha undervoltage (UVLO) ndi ntchito yoteteza katundu wambiri (OLP), kuphatikiza ntchito yoteteza mawu.

▲ MOSFET pagalimoto yofewa: imatha kusintha bwino EMI yadongosolo.

2269 mawonekedwe omangidwira: amatha kuchepetsa EMI ndikuchepetsa EMI.

3, Magetsi schematic chithunzi cha kusintha adaputala mphamvu;