Reverse Current Blocking Circuit Design

Reverse current ndi pamene voteji yomwe imachokera ku dongosolo imakhala yokwera kuposa mphamvu yamagetsi yomwe imalowetsa, zomwe zimapangitsa kuti magetsi aziyenda mozungulira.

Kochokera:

1. diode ya thupi imakhala yosakondera pamene MOSFET imagwiritsidwa ntchito posintha katundu.

2. kutsika kwadzidzidzi kwamagetsi olowera pamene magetsi amachotsedwa ku dongosolo.

Nthawi zina pomwe kutsekereza kwaposachedwa kuyenera kuganiziridwa:

1. pamene mphamvu ya multiplexed supply ikuyendetsedwa ndi MOS

2. Kuwongolera kwa ORing.ORing ndi yofanana ndi kuchulukitsa mphamvu, kupatula kuti m'malo mosankha magetsi kuti agwiritse ntchito dongosolo, magetsi apamwamba kwambiri amagwiritsidwa ntchito nthawi zonse kuti agwiritse ntchito mphamvu.

3. pang'onopang'ono voteji dontho pa kutaya mphamvu, makamaka pamene linanena bungwe capacitance ndi lalikulu kwambiri kuposa athandizira capacitance.

Zowopsa:

1. reverse current imatha kuononga mayendedwe amkati ndi magetsi

2. reverse spikes panopa akhoza kuwononga zingwe ndi zolumikizira

3. diode ya thupi la MOS imakwera pakugwiritsa ntchito mphamvu ndipo imatha kuonongeka

Njira zokwaniritsira:

1. Gwiritsani ntchito ma diode

Ma diode, makamaka ma Schottky diode, amatetezedwa mwachilengedwe kuti asagwirizane ndi polarity yosinthika, koma ndi okwera mtengo, amakhala ndi mafunde obwerera mobwerera, ndipo amafuna kuti pakhale kutentha.

2. Gwiritsani ntchito MOS yobwerera kumbuyo

Mayendedwe onsewa amatha kutsekedwa, koma amakhala m'dera lalikulu la board, impedance yokwera kwambiri, yokwera mtengo.

Mu chithunzi chotsatirachi, kuwongolera transistor conduction, wokhometsa wake ndi otsika, awiri PMOS conduction, pamene transistor kuchoka, ngati linanena bungwe ndi apamwamba kuposa athandizira, mbali lamanja la MOS thupi diode conduction, kuti mlingo D mkulu, kupanga G mlingo ndi mkulu, kumanzere kwa MOS thupi diode sichidutsa, ndipo nthawi yomweyo, chifukwa MOS wa VSG kwa thupi diode voteji dontho si mpaka pakhomo voteji, kotero awiri a MOS adatseka, zomwe zidatsekereza zotulutsa zomwe zidalowa.Izi zimatchinga zomwe zilipo tsopano kuchokera pazotulutsa kupita ku zolowetsa.

3. Sinthani MOS

Reverse MOS imatha kuletsa zotulutsa zomwe zimalowa m'mbuyo, koma choyipa ndichakuti nthawi zonse pamakhala njira ya diode ya thupi kuchokera pazolowera kupita kuzomwe zimatuluka, ndipo osati mwanzeru mokwanira, pamene zotulukazo ndi zazikulu kuposa zomwe zalowetsedwa, sizingatembenuke. kuchoka pa MOS, komanso muyenera kuwonjezera dera lofananiza voteji, kotero pamakhala diode yabwino pambuyo pake.

4. Kusintha kwa katundu

5. Multiplexing

Multiplexing: kusankha chimodzi mwazinthu ziwiri kapena zingapo zolowetsa kuchokera pakati pawo kuti zitheke kutulutsa kumodzi.

6. Diode yabwino

Pali zolinga ziwiri popanga diode yabwino, imodzi ndikutsanzira Schottky ndipo ina ndikuti payenera kukhala gawo lofananitsa zotulutsa kuti lizimitse mobwerera.