nūhou

Hoʻohana mākou i nā kuki e hoʻonui i kou ʻike. Ma ka hoʻomau ʻana i ka nānā ʻana i kēia pūnaewele, ʻae ʻoe i kā mākou hoʻohana ʻana i nā kuki. ʻIke hou aku.
Pono e koho pono ʻia nā inductors i nā noi hoʻololi DC-DC automotive e hoʻokō i ka hui kūpono o ke kumukūʻai, ka maikaʻi, a me ka hana uila. hiki ke hana ʻia.
Aia ma kahi o 80 mau polokalamu uila like ʻole i ka uila uila, a pono kēlā me kēia noi i kāna kaila mana paʻa ponoʻī, i loaʻa mai ka volta pākaukau. he "buck" a "buck-boost" hoʻololi hoʻololi, no ka mea hiki i kēia ke hoʻokō i ka pono a me ka maikaʻi o ka ʻoi aku ma mua o 90%.Compactness.ʻO kēia ʻano hoʻololi hoʻololi e pono ai kahi inductor.ʻO ke koho ʻana i ka ʻāpana kūpono i kekahi manawa he mea pohihihi, no ka mea, ʻo ka helu ʻana i koi ʻia i hoʻokumu ʻia i ka manaʻo magnetic 19th century. hiki iā lākou ke koho mai ka papa inoa o nā ʻāpana. Akā naʻe, ʻaʻole i maʻalahi nā mea: pono e hana ʻia kekahi mau manaʻo, pono e kaupaona ʻia nā pono a me nā pōʻino, a koi pinepine ia i nā hoʻolālā hoʻolālā he nui. a pono e hoʻolālā hou ʻia e ʻike i ke kūpono o nā inductors waho.
E noʻonoʻo kākou i kahi mea hoʻoponopono buck (Figure 1), kahi ʻo Vin ka uila uila, ʻo Vout ka haʻahaʻa haʻahaʻa kaʻa uila mana, a ua hoʻohuli ʻia ʻo SW1 a me SW2 i kahi ʻē aʻe. ʻO ka hoʻohālikelike hana maʻalahi ʻo Vout = Vin.Ton/ (Ton + Toff) kahi ʻo Ton ka waiwai ke pani ʻia ʻo SW1 a ʻo Toff ka waiwai i ka wā e wehe ai. Hoʻololi ʻia ʻo SW1 e ʻae iā ia e mālama i ka hopena i ka wā e pio ai. Hiki ke helu i ka ikehu i mālama ʻia a hoʻohālikelike ʻia me ka ikehu i makemake ʻia, akā aia kekahi mau mea ʻē aʻe e pono e noʻonoʻo mua ʻia. ʻO ka hoʻololi ʻana o SW1 a me SW2 ke kumu o ke au i loko o ka inductor e pi'i a hina, a laila e hana ana i ka triangular "ripple current" ma ka awelika DC waiwai. ʻO ka capacitor ESR e hoʻopuka i ka ripple voltage pukana. Inā he mea koʻikoʻi kēia, a hoʻopaʻa ʻia ka capacitor a me kāna ESR e ka nui a i ʻole ke kumu kūʻai, hiki i kēia ke hoʻonohonoho i ka waiwai ripple a me ka waiwai inductance.
ʻO ka mea maʻamau ke koho ʻana i nā capacitors e hāʻawi i ka maʻalahi. ʻO ia ke ʻano inā he haʻahaʻa ka ESR, hiki ke kiʻekiʻe ka ripple o kēia manawa. a ʻo SW2 he diode, ma lalo o nā kūlana maʻamau, e pau ia i ka hana ʻana i ka wā o ka pōʻai, a e komo ka mea hoʻololi i ke ʻano "discontinuous conduction". steady state.Modern buck converters hoʻohana maʻamau i ka synchronous rectification, kahi SW2 ʻo MOSEFT a hiki ke alakaʻi i ke kahawai wai ma nā ʻaoʻao ʻelua i ka wā e hoʻāla ʻia ai. ʻO ia hoʻi, hiki i ka inductor ke hoʻoluli maikaʻi ʻole a mālama i ka hoʻomau mau ʻana (Figure 2).
I kēia hihia, hiki ke ʻae ʻia ke kiʻekiʻe o ka peak-to-peak ripple current ΔI, i hoʻonohonoho ʻia e ka inductance value e like me ΔI = ET/LE ʻo ia ka uila inductor i hoʻohana ʻia i ka manawa T. I ka wā ʻo E ka uila puka. , ʻoi aku ka maʻalahi o ka noʻonoʻo ʻana i ka mea e hiki mai ana i ka manawa hoʻohuli ʻo Toff o SW1.ΔI ka mea nui loa i kēia manawa no ka mea ʻo Toff ka mea nui loa i ka volta komo kiʻekiʻe loa o ka hana hoʻoili. V, he puka puka o 3.3 V, he peak-to-peak ripple o 1 A, a me ka alapine hoʻololi o 500 kHz, L = 5.4 µH. Ke manaʻo nei kēia ʻaʻohe hāʻule uila ma waena o SW1 a me SW2. helu ʻia ma kēia helu ʻana.
Hiki i kahi hulina pōkole o ka papa inoa ke hōʻike i nā ʻāpana he nui i kūlike nā helu o kēia manawa i ka ukana i koi ʻia. ma 0.5 A ma luna o ka haawe o kēia manawa. Aia nā ʻano like ʻole e loiloi ai i ke au o kahi inductor: ma ke ʻano he palena saturation thermal a i ʻole ka palena saturation magnetic. Hana ʻia i nā au kiʻekiʻe inā hiki ke hoʻolili.
ʻO ka poho inductance kekahi mea nui e noʻonoʻo ai. ʻO ka poho ka nui o ka poho ohmic, hiki ke helu ʻia i ka wā haʻahaʻa ka ripple o kēia manawa. ka pinepine a me ka mahana, no laila ua paʻakikī ke wānana. ʻO nā hoʻokolohua maoli i hana ʻia ma ka prototype, no ka mea e hōʻike paha kēia i ka haʻahaʻa ripple o kēia manawa pono no ka pono holoʻokoʻa maikaʻi loa. kaʻina hana.
ʻO TT Electronics 'high-performance HA66 series kahi hoʻomaka maikaʻi (Figure 3). Aia i loko o kona laulā kahi ʻāpana 5.3 µH, kahi kaha saturation i helu ʻia o 2.5 A, ʻae ʻia kahi ukana 2 A, a me kahi ripple o +/- 0.5 A. He kūpono kēia mau ʻāpana no nā noi kaʻa a ua loaʻa iā AECQ-200 hōʻoia mai kahi hui me kahi ʻōnaehana maikaʻi i ʻae ʻia e TS-16949.
Loaʻa kēia ʻike mai nā mea i hāʻawi ʻia e TT Electronics plc a ua loiloi ʻia a hoʻololi ʻia.
TT Electronics Co., Ltd. (2019, ʻOkakopa 29). Nā mea hoʻokomo mana no nā noi DC-DC kaʻa.AZoM. Loaʻa ʻia mai https://www.azom.com/article.aspx?ArticleID=17140 ma Dekemaba 27, 2021.
TT Electronics Co., Ltd. "Nā mea hoʻokomo mana no nā noi DC-DC kaʻa".AZoM.December 27, 2021..
TT Electronics Co., Ltd. "Nā mea hoʻokomo mana no nā noi DC-DC kaʻa".AZoM.https://www.azom.com/article.aspx?ArticleID=17140. (Loaʻa ma Dekemaba 27, 2021).
TT Electronics Co., Ltd. 2019. Nā mea hoʻokomo mana no nā noi DC-DC automotive.AZoM, nānā ʻia ma Dekemaba 27, 2021, https://www.azom.com/article.aspx?ArticleID=17140.
Ua kamaʻilio ʻo AZoM iā Polofesa Andrea Fratalocchi mai KAUST e pili ana i kāna noiʻi, i kālele ʻia i nā ʻano lanahu i ʻike mua ʻole ʻia.
Kūkākūkā ʻo AZoM me Dr. Oleg Panchenko i kāna hana ma ka SPbPU Lightweight Materials and Structure Laboratory a me kā lākou papahana, e manaʻo ana e hana i kahi alahaka māmā hou me ka hoʻohana ʻana i nā alumini alumini hou a me ka ʻenehana hoʻoheheʻe friction.
ʻO X100-FT kahi mana o X-100 mīkini hoʻāʻo honua i hana ʻia no ka hoʻāʻo ʻana i ka fiber optic.
Hiki i ka MicroProf® DI ke nānā aku i nā mea hana no nā noi semiconductor ke nānā i nā wafers i kūkulu ʻia a i hoʻonohonoho ʻole ʻia i loko o ke kaʻina hana.
ʻO StructureScan Mini XT ka mea hana maikaʻi loa no ka nānā ʻana;hiki iā ia ke hoʻomaopopo pololei a me ka wikiwiki i ka hohonu a me ke kūlana o nā mea metala a me nā mea ʻole i loko o ke kaʻa.
Ua noiʻi ʻia ka noiʻi hou ma China Physics Letters i ka superconductivity a me ka hoʻopaʻa haʻahaʻa haʻahaʻa i nā mea papa hoʻokahi i ulu ʻia ma nā substrates graphene.
E ʻimi kēia ʻatikala i kahi ala hou e hiki ai ke hoʻolālā i nā nanomaterials me ka pololei o lalo o 10 nm.
Hōʻike kēia ʻatikala e pili ana i ka hoʻomākaukau ʻana i nā BCNT synthetic e ka catalytic thermal chemical vapor deposition (CVD), e alakaʻi ana i ka hoʻoili wikiwiki ʻana ma waena o ka electrode a me ka electrolyte.