Gcina ibhethri ye-lithium ngokulibaziseka

Umbhali :Iflowpower - Umhlinzeki Wesiteshi Samandla Esiphathekayo

Leli nothi lohlelo lokusebenza lichaza ukunikezwa kwamandla okuyinhloko nebhethri eliyisipele ngesekhethi ye-diode "noma" enengqondo nokuxhumeka komthwalo. Lesi sakhiwo kulula ukusiqonda, kodwa lapho i-voltage yebhethri idlula i-voltage enkulu yokuhlinzeka, isifunda se-diode "noma" esinengqondo sizoxhuma ibhethri, futhi ukunikezwa kwamandla okuyinhloko akukwazi ukukhethwa ngokunengqondo. Lesi sihloko sinikeza indlela yokuxazulula le nkinga.

Isiqhathaniso se-MAX931, isisekelo esakhelwe ngaphakathi esingu-2%. Amandla amakhulu namabhethri ayisipele axhunywe ukuze alayishe ngomjikelezo we-diode "noma" onengqondo. Kodwa-ke, lapho i-voltage yebhethri idlula i-voltage enkulu yokuphakelwa kwamandla, isekethe ye-diode "noma" enengqondo inika amandla ibhethri, futhi ayikwazi ukukhetha ngokufanelekile ukunikezwa kwamandla okuyinhloko.

Umfanekiso 1 unikezwa indlela yokuxazulula le nkinga, ububanzi be-voltage ye-main switching power supply yi-7V kuya ku-30V, i-spare power supply yibhethri engu-9V. Umfanekiso 1.IC1MAX931 usetshenziselwa ukuqapha amandla kagesi amakhulu.

Uma i-voltage enkulu yokuhlinzeka yehla ngaphansi kuka-7.4V, ingabuyiselwa emuva ebhethrini eliyisipele ngokumisa ibhethri elingenayo. I-MAX931 iyisiqhathaniso samandla aphansi kakhulu nge-1.

182V igebe lebhendi. Lapho kusebenza kahle, okokukhiphayo kwesiqhathanisi kuphansi, ama-FET amathathu afanayo e-N-channel ayavalwa, futhi i-negative yebhethri ayinalutho, ngokuphakelwa kwamandla okuyinhloko Ukunikezwa kwamandla okulayisha. Lapho i-voltage enkulu yokunikezela yehla iye ku-7.

4V, isiqhathanisi sikhipha izinga eliphezulu. Izovula i-N-channel FET, igaye i-negative yebhethri, inikwa amandla yibhethri (Umfanekiso 2). Umfanekiso 2.

I-voltage enkulu yokuphakelwa kwamandla (isiteshi 3 ku-Fig. I-1) iyancipha kancane kancane, i-voltage yesango le-N-channel FET iba phezulu (isiteshi 2). Lokhu kuzovula ibhethri ukuze i-voltage ephumayo (isiteshi 1) ifinyelele ku-9V.

Lapho i-voltage enkulu yokuhlinzeka ifinyelela ku-8.4V, i-N-channel FET iyavalwa, futhi ukunikezwa kwamandla okuyinhloko kuyaphuma. I-D1, C1, ne-R6 yesekethe yedrayivu yesango ibonakala ukubambezeleka okuthile, okususa ukuphazamiseka kwesikhashana ukuthi isekethe ibonakala isuka kubhethri iye emthonjeni wamandla oyinhloko, futhi lokhu kuphazamiseka kwesikhashana kungabangela isilawuli esincane sohlelo ukuthi simiswe kabusha, leli phuzu Elilodwa mayelana nezinhlelo eziningi alimukeleki.

Umfanekiso wesi-3 ubonisa izici lapho isifunda singekho ukuphazamiseka kwesikhashana. Qaphela: I-R3 ne-R4 isetha i-hysteresis voltage ye-MAX931 kuya ku-800mV ukuze kuqinisekiswe isimo esilungile sokusebenza. Sicela ubheke inani elihambisanayo lokumelana ledatha yedatha ye-MAX931.

Umfanekiso 3. Uma ukunikezwa kwamandla kubuyiselwa ngokushesha, impendulo yokuphumayo ayikho ekuphazamisekeni kwesikhashana.