Nhazi chaja na Nchedo Oke
Mmụba nke ngwaọrụ eletrọniki a na-ebugharị ebugharị—site na ekwentị mkpanaaka na mbadamba ruo na ngwaọrụ IoT—na-akpali mkpa ọ dị ịnweta chaja ngwa ngwa, obere, na nke dị irè. Agbanyeghị, n'agbanyeghị ọchịchọ maka chaja ọsọ ọsọ, nchekwa ka bụ ihe kacha mkpa. Otu ihe iyi egwu a na-eleghara anya bụ inrush current (ma ọ bụ surge current), nke nwere ike ime ma n'akụkụ ntinye na mmepụta nke chaja. Surge current nwere ike ịkpalite oke ọkụ, mee ka mmebi akụkụ dịkwuo ngwa ngwa, mebie batrị, ma ọ bụ ọbụna tinye ihe egwu ọkụ. Ya mere, nhazi chaja dị mma ga-agụnye nchedo surge nke e mere n'usoro—na ọkwa sekit, nhọrọ akụkụ, nhazi PCB, na atụmatụ njikwa.
Ịghọta mmụba dị ugbu a na chaja
Oke mmụba bụ mmụba mberede na ọkụ eletrik nke gafere uru nkịtị ruo obere oge. Na chaja, oke mmụba nwere ike ime n'ihi ọtụtụ ọnọdụ:
1. Mkpọnye ọkụ eletrik mgbe etinyere ya na ọkụ eletrik (ntinye AC)
Mgbe e jikọtara ihe nkwụnye ọkụ eletrik (SMPS) na isi iyi AC mbụ, a ka na-ahapụ ihe nkwụnye ọkụ eletrik (nnukwu ihe nkwụnye ọkụ eletrik). Nchaji mbụ nke ihe nkwụnye ọkụ eletrik a nwere ike ịdọpụta nnukwu ọkụ eletrik nwa oge. Ọzọkwa, ihe nzacha EMI na sekit rectifier na-enyekwa aka na mmụba ọkụ eletrik.
2. Mmụba n'ihi nsogbu nke grid ọkụ eletrik
Voltaji AC nwere ike ịnwe mgbanwe n'ihi mgbanwe ibu buru ibu, àmụ̀mà na-apụtaghị ìhè, ma ọ bụ enweghị mma nrụnye eletriki. Mkpọlite voltaji mberede nwere ike ịkpalite mmụba ọkụ eletrik n'ebe ụfọdụ.
3. Mkpọpụta n'akụkụ mmepụta (DC)
Mgbe ejikọtara chaja na ibu nwere nnukwu capacitor (dịka ọmụmaatụ ngwaọrụ nwere nnukwu nzacha ntinye) ma ọ bụ batrị nwere obere voltaji, ọkụ chaja mbụ nwere ike ịgbago karịa nhazi aha.
4. Nsogbu dị mkpụmkpụ ma ọ bụ ọnọdụ na-adịghị mma
Eriri ndị mebiri emebi, ọdụ ụgbọ mmiri ruru unyi, ma ọ bụ mmejọ onye ọrụ nwere ike ibute obere mkpụmkpụ nwa oge. Ọ bụrụ na ọ nweghị nchekwa, ọkụ eletrik ga-abawanye nke ukwuu ma mebie akụkụ ike.
Ịghọta ebe ihe ndị a si apụta dị mkpa ka nchedo ghara "ịgwọta ihe mgbaàmà ndị a," kama ọ na-emechi oghere ihe egwu ahụ.
Ụkpụrụ Nhazi Nchedo: Ejiri akwa mee ihe ma gbasaa
Nhazi nchebe siri ike nke na-agụnyekarị ọtụtụ nchekwa. Nke a pụtara na ha anaghị adabere na otu akụkụ, kama ọ bụ ngwakọta nke nchekwa na-adịghị arụ ọrụ, nchekwa na-arụ ọrụ, na njikwa firmware (ọ bụrụ na ọ dị mkpa). Ọzọkwa, a ga-enwerịrị ike ịtụle nchedo ahụ: a ga-ama oke ya, oge nzaghachi, mmetụta ya na arụmọrụ chaja, na ihe ga-esi na ịgbalite nchedo ahụ pụta.
N'ozuzu, enwere ike kewaa nchedo mmụba na chaja n'ime:
- Nchedo akụkụ ntinye AC (tupu ntụgharị DC)
- Nchedo akụkụ mmepụta DC (n'akụkụ ngwaọrụ/batrị)
- Nchedo okpomọkụ (n'ihi na oke ọkụ na-adakọ na oke okpomọkụ)
- Nchedo Logic/control iji chịkwaa oke mmalite dị nro na nke ugbu a
Nchedo Mmụba n'akụkụ Ntinye (AC)
1. Fuse na PTC
Fiuz bụ ihe nchebe dị mkpa iji gbochie mmebi na ọkụ dị ukwuu. Maka ihe nkwụnye ọkụ, fiuz ahụ na-adịkarị n'ahịrị ntinye mgbe njikọ AC gasịrị.
– Fuse ndị na-efe ọsọ ọsọ na-aza ngwa ngwa maka nnukwu iyi, mana ha nwere ike ịfụ ngwa ngwa n'oge inrush.
– Fuuz ndị na-efe nwayọ nwayọ/na-egbu oge na-anagide inrush karịa mana ha ka na-echebe megide overcurrent na-aga n'ihu.
Ọzọkwa, enwere ike iji fuse PTC resettable (polyfuses) n'ahịrị ụfọdụ maka nchekwa a pụrụ iweghachite, ọ bụ ezie na njirimara ha dabara adaba maka ọnọdụ ndị na-adịghị oke oke.
2. NTC Inrush Limiter Ugbu a
Ihe a na-ahụkarị maka iguzogide inrush bụ thermistor NTC. Mgbe oyi na-atụ, iguzogide ya dị elu, na-egbochi ọkụ mbụ. Ozugbo mmiri ọkụ ahụ kpoo ọkụ, nguzogide ahụ na-ebelata, na-ebelata mfu ike.
Uru NTC bara bụ ịdị mfe na ọnụ ala dị ala. Ihe na-adịghị mma bụ na ọ bụrụ na a na-etinye chaja ugboro ugboro ma na-apụ ya n'ime obere oge, NTC enweghị oge iji jụọ oyi, nke na-ebelata mmetụta ya na-egbochi inrush. Nke a dị mkpa n'ọnọdụ ojiji n'ezie.
3. Sekit Mmalite Dị Ọcha Na-arụ Ọrụ (Mmachi Mmalite Na-arụ Ọrụ)
Maka atụmatụ ndị ọzọ dị elu, enwere ike ime ka mmachi inrush dị na MOSFET na njikwa nke na-eji nwayọọ nwayọọ agbanye voltaji. Nke a nwere uru nke njirimara ndị na-agbanwe agbanwe na ikike ịhazi ya ka ọ dabara na ihe achọrọ, kama ịdabere na okpomọkụ dịka NTC. Ọtụtụ SMPS nke oge a na-ejikọkwa ọrụ mmalite dị nro na njikwa PWM IC, mana nke a na-achọkarị ntụle ọzọ na ịhọrọ uru capacitor dị nro na nchekwa ugbu a kacha elu.
4. Nchedo Voltaji Oge Na-agafe Agbanwe (MOV/TVS)
Ọ bụ ezie na isi okwu bụ mmụba ọkụ eletrik, mmụba ọkụ eletrik na-abụkarị ihe na-akpali mmụba ọkụ eletrik. Ya mere, MOV (Metal Oxide Varistor) dị na ntinye AC nwere ike ịmịkọrọ mmụba ọkụ eletrik. Nhọrọ ọzọ bụ TVS diode (na-abụkarị n'akụkụ DC), mana ụkpụrụ ahụ bụ otu ihe ahụ: "ịkpọchi" mmụba ahụ iji gbochie ya ịgbasa ma kpalite oke ọkụ eletrik.
Nchedo Mmụba n'akụkụ Mpụta (DC)
1. Mmachi Ugbu a na Ọnọdụ Ugbu a Na-adịgide
Chaja dị mma na-etinye ihe mgbochi ugbu a iji gbochie ọkụ eletrik ịgafe oke nchekwa. Ndị na-agba batrị na-eji usoro CC-CV (Constant Current–Constant Voltage): a na-edobe chaja mbụ na ọkụ eletrik na-agbanwe agbanwe dịka ọkwa si dị, wee gbanwee gaa na voltaji na-agbanwe agbanwe ka batrị na-erute ikike zuru oke.
Ihe mgbochi ugbu a na-egbochi mmụba n'oge batrị dị ala ma ọ bụ ibu mberede. Mmejuputa nwere ike ịgụnye:
- Njikwa Sense + amplifier + njikwa PWM
- Chaja IC nke nwere iwu dị ugbu a jikọtara ọnụ
- Njikwa dijitalụ na ụfọdụ atụmatụ (ụfọdụ ndị na-achịkwa USB-PD nwere ike ịrụ ọrụ)
2. OCP (Nchedo Oke Ọsọ) na Nchedo Gburugburu Dị Mfe
Karịa mmachi ọkụ eletrik nkịtị, a chọrọ OCP ka ọ rụọ ọrụ mgbe ọkụ eletrik karịrị akarị mere n'ihi nsogbu (dịka ọmụmaatụ, obere sekit). N'ozuzu, nchekwa ahụ ga-eme:
– gbanyụọ mmepụta (latch-off),
- tinye ọnọdụ hiccup (gbanye ma gbanyụọ ugboro ugboro),
– ma ọ bụ foldback current (ugbua na-ada mgbe voltaji daa).
A na-ahọrọkarị ụdị Hiccup n'ihi na ọ na-ebelata okpomọkụ nkịtị mgbe obere oge gasịrị, ebe ọ na-enye sistemụ ohere ịgbake ma ọ bụrụ na obere oge ahụ bụ naanị nwa oge.
3. Nchedo site na eFuse ma ọ bụ Ibu Mgbanwe
Maka chaja ọgbara ọhụrụ (karịsịa USB-C/USB-PD), ojiji nke eFuse ma ọ bụ swiitị ibu nwere oke ugbu a na-ewu ewu nke ukwuu. Ihe ndị a nwere ike:
- na-ebelata oge ugbu a kpọmkwem,
- iwepụ ngwa ngwa mgbe ọ dị mkpụmkpụ,
- setịpụ mmalite dị nro n'akụkụ mmepụta,
- na-echebe site na mgbanwe ọkụ.
Ngwọta a dabara adaba mgbe ịchọrọ nchekwa mmepụta dị mma na-enweghị imepụta sekit dị mgbagwoju anya.
4. TVS Diode na mmepụta
Ihe ndị na-agbanwe agbanwe na eriri mmepụta nwere ike ime n'ihi njehie ESD (nkwụnye elektrọnik) ma ọ bụ nsogbu nkwụnye/ịwepụ plọg. TVS diode na-enyere aka iguzogide mgbawa voltaji nke nwere ike ịkpalite mmiri na-adịghị mma na sekit dị n'okpuru ala.
Nchedo Okpomọkụ dị ka Mmetụta nke Mmụba Ugbu a
Ọkụ ọkụ na-apụtakarị mmụba nke ike na MOSFET, diode, transformers, ma ọ bụ ihe ndị na-eguzogide mmetụta. Ya mere, a ga-ewere nchedo okpomọkụ dị ka akụkụ nke nchekwa ọkụ.
Ụfọdụ ụzọ:
– Mmechi okpomọkụ nke onye njikwa/chaja IC.
- Ihe mmetụta okpomọkụ NTC nke microcontroller ma ọ bụ IC chaja na-enyocha.
- Nhazi igwe na njikwa okpomọkụ: heatsinks, okporo ụzọ ọla kọpa sara mbara, vias okpomọkụ, itinye akụkụ ọkụ.
Ọ bụrụ na e ji chaja mee ya nke ọma, oke okpomọkụ ahụ ga-adị obere nke na naanị nchekwa ugbu a ezughị ezu; nchedo okpomọkụ na-enyere aka igbochi ihe na-apụ n'ebe obibi ọkụ.
Atụmatụ Nhazi Bara Uru: Ịchọpụta Ọnụọgụ na Oge Mmeghachi Omume
A ghaghị ikpebi nchedo dị irè dabere na paramita nhazi:
1. Ọkụ mmepụta aha (dịka ọmụmaatụ 3 A maka USB-C 15 W, ma ọ bụ karịa maka chaja ngwa ngwa).
2. Oke ọkụ ka dị nchebe ruo obere oge.
3. Oge nzaghachi: otu nchekwa ga-esi rụọ ọrụ ngwa ngwa ka MOSFET/diode ghara ịgafe SOA (Ebe Ọrụ Nchekwa).
4. Ụdị mgbake: ịnwaleghachi onwe ya, nsogbu, mkpọchi.
5. Atụmatụ onye ọrụ: ugboro ole a na-etinye/ịkwụsị plọg, ma enwere ọtụtụ ojiji eriri ogologo, ma ngwaọrụ ebumnuche ọ nwere nnukwu capacitor ntinye.
Karịsịa maka inrush, ọ dị mkpa ịhazi ihe abụọ: igbochi mmụba ahụ n'emeghị ka mmalite ahụ daa. Oke oke mmachi nwere ike ime ka mmepụta ahụ "daa," kpalite oscillation, ma ọ bụ mee ka mkparịta ụka USB-PD daa.
Ọrụ nke Nhazi PCB na Nhọrọ Akụkụ
Ọtụtụ mgbe, ezigbo nchekwa na atụmatụ ahụ na-ada ada n'ọrụ n'ihi nhazi adịghị mma. Isi ihe dị mkpa:
– Ụzọ ọkụ dị elu kwesịrị ịdị mkpụmkpụ ma obosara, yana nloghachi ala doro anya.
– A ga-etinye ihe mgbochi mmetụta ahụ n'akụkụ IC njikwa ma jiri njikọ Kelvin maka ịgụ ihe ziri ezi.
- Kewapụ obere ụzọ mgbaama na ụzọ mgbanwe mkpọtụ iji gbochie mkpali ụgha nke OCP.
– Hụ na ọkwa nke ihe mejupụtara ya dị: MOSFET nwere SOA zuru oke, diode/rectifiers nwere ọkwa mmụba, na capacitors nwere ọkụ eletrik kwesịrị ekwesị.
Nhọrọ nke akụkụ dịkwa oke mkpa. Dịka ọmụmaatụ, ihe na-edozi ihe na MOSFET mbụ na SMPS nwere ọkwa mmụba pụrụ iche nke a ga-enyocha na mpempe akwụkwọ data, ọ bụghị naanị ọkwa nkezi ugbu a.
Nnwale na Nkwenye Nchedo
Nhazi nchekwa ekwesịghị "ịche na nchekwa" naanị; ekwesịrị ịchọpụta ya. Ụfọdụ ule dị mkpa:
- Tinye nha ugbu a n'oge nkwụnye na akụkụ dị iche iche nke usoro AC.
- Nnwale sekit dị mkpirikpi na mmepụta: nyochaa ugbu a, okpomọkụ, na omume nchekwa.
– Nnwale ibu nwa oge: ibu ngwa ngwa na-agbanwe site na obere gaa na arọ.
- Nnwale Surge/ESD dịka ụkpụrụ dị mkpa si dị (dabere na ebumnuche asambodo).
– Mmiri okpomọkụ: nwalee ya n'ebe dị elu iji hụ na nchekwa na-aga n'ihu na-arụ ọrụ.
Ịtụle ihe nyocha dị ugbu a na idekọ okpomọkụ nke ihe mejupụtara ya (thermocouple/thermal camera) na-enyere aka nke ukwuu n'ịhụ "ihe omume dị mkpirikpi" nke a na-anaghị ahụ anya na multimeter.
Mmechi
Nhazi chaja nwere nchekwa mmụba bụ njikọta nke nghọta nke ihe ndị na-eme n'ime ngwa ngwa/mmiri, ịhọrọ ụdị nchedo kwesịrị ekwesị, na mmejuputa iwu na ọkwa ngwaike na nhazi. Nchedo ntinye dịka fuses, NTCs, mmalite dị nro na-arụ ọrụ, na MOVs na-enyere aka iguzogide mmụba site na grid ike. Nchedo mmepụta dịka mmachi ugbu a, OCP, eFuse/load switches, na TVS na-echebe ngwaọrụ na batrị site na oke ọkụ eletrik nke oke ibu, mkpụmkpụ, ma ọ bụ transients kpatara n'oge nkwụnye na iwepụ plọg. N'ikpeazụ, nchekwa okpomọkụ na nnwale zuru oke na-eme ka ngwọta ahụ dị nchebe kpamkpam na ojiji n'ezie.
Mgbe e mere ya nke ọma, nchekwa mmụba anaghị egbochi mmebi, kamakwa ọ na-eme ka ntụkwasị obi dịkwuo mma, ndụ akụkụ ahụ, na ntụkwasị obi onye ọrụ nwere n'ịdị mma nke chaja ahụ - karịsịa n'oge a na-eji chaja ngwa ngwa, nke chọrọ ike dị elu na obere ngwugwu.
