txoj kev them nyiaj

txoj kev them nyiaj

Txoj kev them nyiaj yog qhov tseem ceeb tshaj plaws. Txhawm rau them cov roj teeb lithium, koj xav tau lub charger tshwj xeeb uas txhawb nqa lithium roj teeb them hom.

Feem ntau cim rau ntawm lub charger lub ntim. Ntau lub chargers tau sib xws nrog ob hom kev them nyiaj. Thaum yuav khoom, ua tib zoo saib seb nws puas tau lees paub lossis manually teeb tsa los ntawm kev hloov. Yog tias nws tau teeb tsa manually, nws yuav tsum tau teeb tsa kom raug raws li hom roj teeb raug them. Rau nickel-cadmium / nickel-hlau hydride roj teeb, lub charger zoo heev siv txoj kev them nyiaj nrog rub-down tsis zoo mem tes kom txo tau cov nyhuv polarization thaum them nyiaj. Tus nqi qis qis ib txwm siv them tam sim no tas li. Lub roj teeb them waveform nyob ntawm oscilloscope kom pom tseeb.

Lub charger siv lub RCC hom hloov fais fab mov, uas yog, ib qho oscillation suppression hom converter, uas txawv ntawm PWM hom switching fais fab mov. PWM hom hloov hluav taws xob muaj xws li kev ua piv txwv qhov yuam kev amplifier thiab DC amplifier los tsim lub pulse width modulation system; thiab RCC hom switching fais fab mov tsuas yog tsim los ntawm cov hluav taws xob tswj hluav taws xob los tsim cov qib hloov, thiab cov txheej txheem tswj yog lub xeev oscillation thiab lub xeev suppression. Txij li thaum hloov lub raj hauv PWM hom hloov hluav taws xob ib txwm nyob thiab tawm ib ntus, lub kaw lus tswj tsuas yog hloov pauv cov mem tes dav ntawm txhua lub voj voog, thiab cov txheej txheem tswj ntawm RCC hom hloov hluav taws xob hloov pauv tsis tu ncua. Nws tsuas muaj ob lub xeev: thaum lub zog hloov hluav taws xob Thaum qhov hluav taws xob tso zis ntau tshaj qhov ntsuas tus nqi, lub tshuab hluav taws xob pulse outputs qis qis, thiab lub raj hloov tau raug tua; Thaum qhov tso zis hluav taws xob ntawm qhov hloov hluav taws xob hloov hluav taws xob qis dua tus nqi ntsuas, lub tshuab hluav taws xob pulse tso tawm ib theem siab, thiab lub raj hloov pauv tau qhib. Thaum lub load tam sim no txo, lub sij hawm tso tawm ntawm lub lim capacitor yog ntev, cov zis voltage yuav tsis txo sai sai, thiab lub hloov raj yog nyob rau hauv lub xeev tawm. Kom txog rau thaum qhov tso zis voltage poob qis dua tus nqi ntsuas, lub raj hloov pauv yuav rov qhib dua. Lub sijhawm txiav tawm ntawm qhov hloov pauv yog nyob ntawm qhov loj ntawm qhov load tam sim no. Lub on/off ntawm tus tes hloov yog tswj los ntawm theem hloov qauv los ntawm cov zis voltage. Yog li ntawd, lub zog hluav taws xob no tseem hu ua qhov tsis siv hluav taws xob hloov hluav taws xob.

220V mains yog rectified los ntawm VD1 ~ VD4 choj los tsim ib tug DC voltage ntawm txog 300V ntawm lub collector ntawm V2. Qhov sib cuam tshuam oscillator yog tsim los ntawm V2 thiab hloov pauv hloov pauv. Tom qab lub hwj chim-on, 300V DC voltage yog siv rau lub collector ntawm V2 los ntawm lub transformer thawj, thiab cov voltage kuj muab nrog ib tug tsis zoo voltage los ntawm lub hauv paus ntawm lub pib resistor R2 rau V2. Vim qhov kev tawm tswv yim zoo, V2Ic nce nrawm thiab saturates. Thaum lub sij hawm V2 nkag mus txiav tawm, qhov induced voltage generated los ntawm lub thib ob winding ntawm lub switching transformer tig VD7 rau, thiab outputs ib tug DC voltage ntawm txog 9V rau lub load. Lub induced mem tes generated los ntawm lub tswv yim winding ntawm lub switching transformer yog rectified los ntawm VD5 thiab lim los ntawm C1 los tsim ib tug DC voltage proportional rau tus naj npawb ntawm oscillation pulses. Yog tias qhov hluav taws xob no dhau qhov kev tswj hwm tus nqi ntawm qhov ntsuas hluav taws xob VD17, VD17 yuav raug muab tso rau, thiab qhov tsis zoo ntawm qhov hluav taws xob rectifier yuav raug siv rau lub hauv paus ntawm V2 kom nws txiav tawm sai sai. Lub sijhawm txiav tawm ntawm V2 yog inversely proportional rau nws cov zis voltage. Lub on / off ntawm VD17 yog ncaj qha cuam tshuam los ntawm daim phiaj voltage thiab load. Qhov qis dua ntawm daim phiaj hluav taws xob lossis qhov loj dua ntawm qhov tam sim no, lub sijhawm luv ntawm VD17 thiab qhov ntev ntawm lub sijhawm ntawm V2. Hloov pauv, qhov siab dua ntawm daim phiaj hluav taws xob lossis qhov me me ntawm cov khoom thauj tam sim no, qhov siab dua qhov kev hloov pauv ntawm VD5 thiab lub sijhawm ntawm VD17. Qhov ntev, qhov luv luv ntawm lub sijhawm ntawm V2. V1 yog ib lub raj tiv thaiv overcurrent thiab R5 yog ib qho piv txwv ntawm V2Ie. Thaum V2Ie loj dhau lawm, qhov hluav taws xob poob ntawm R5 tig V1 rau thiab V2 tig tawm, uas tuaj yeem tshem tawm cov inrush tam sim no thaum pib, thiab tseem them nyiaj rau kev tswj hwm ntawm VD17. VD17 siv cov qauv ntsuas hluav taws xob los tswj lub sijhawm oscillation ntawm V2, thaum V1 siv cov qauv tam sim no los tswj lub sijhawm V2 oscillation.

Yog tias nws them cov roj teeb nickel-cadmium lossis nickel-hydrogen roj teeb, vim tias lub cim xeeb ntawm cov roj teeb zoo li no, nws yog ib qho tsim nyog yuav tsum tso tawm lawv ib ntus. SW1 yog nickel-cadmium, nickel-hydrogen, lithium-ion roj teeb hloov pauv hloov. SW1 thiab precision siv fais fab mov SL431 muab ob qhov sib txawv precision siv qhov chaw rau op amp LM3249, uas tau hloov los ntawm SW1. Thaum them cov roj teeb Ni-Cd thiab Ni-MH, qhov siv hluav taws xob ntawm LM3249 tus pin yog hais txog 0.09V (tsis muaj load); Thaum them lub roj teeb Li-ion, qhov siv hluav taws xob ntawm LM3249 yog li 0.08V (tsis muaj-load). Cov qauv tsim yog txiav txim siab los ntawm cov khoom siv tshuaj lom neeg tshwj xeeb rau ob hom roj teeb. Thaum SW2 nias, lub hauv paus ntawm V5 tig mus rau qis qis rau ib pliag, thiab qhov seem seem ntawm lub roj teeb rov qab tau tawm ntawm R17 los ntawm ec ncej ntawm V5, thiab qhov ntsuas tawm VD14 yog lit. Tom qab nias SW2, nws yuav raug tso tawm tam sim ntawd. Lub sijhawm no, qhov seem seem ntawm lub roj teeb rov qab tau muab faib los ntawm R16 thiab R13. Tom qab C9 lim, lub hauv paus ntawm V4 yog muab nrog rau theem siab, thiab V4 tau qhib, uas yog sib npaug rau luv SW2. Raws li lub sijhawm tso tawm tau txuas ntxiv, qhov seem ntawm qhov hluav taws xob ntawm lub roj teeb rov qab kuj tau qis dua thiab qis dua. Thaum qhov hluav taws xob ntawm lub hauv paus ntawm V4 tsis tuaj yeem tswj nws qhov txuas txuas ntxiv, V4 raug kaw, qhov tso tawm raug txiav, thiab lub charger raug xa mus rau lub xeev them.

Txij li thaum lub roj teeb lithium tsis muaj lub cim xeeb, thaum lub roj teeb qis dua 3V, nws tsis tuaj yeem qhib. Qhov hluav taws xob seem yog muab faib los ntawm cov resistors R40 thiab R41 kom tau txais 2.53V, uas yog xa mus rau hauv-theem terminals 3, 5, thiab 10 ntawm lub lag luam amplifier, vim qhov voltage ntawm LM3249. Nyob rau hauv lub load yog ib txwm 2.66V, yog li 8 tus pin tso zis theem qis, V3 yog qhib, +9V voltage yog them rau lub rechargeable roj teeb los ntawm V3ec ncej thiab VD8. IC1d nyob rau hauv qhov kev txiav txim ntawm capacitor C6, tus {14} tus pin tso tawm lub teeb liab mem tes. Txij li thaum IC18 tus pin yog qib qis, VD12 flashing qhia tias lub roj teeb tau them, thiab cov peev txheej sib xws yog 20%. Raws li lub sij hawm them nyiaj nce, qhov voltage ntawm lub roj teeb rechargeable maj mam nce. Thaum tus nqi faib hluav taws xob ntawm R40 thiab R41 yog kwv yees li sib npaug ntawm 2.58V, uas yog, IC13 tus pin yog sib npaug rau 2.58V, IC12 tus pin yog 2.57V tom qab qhov hluav taws xob faib, thiab nws 1 tus pin outputs siab (txij li thaum them nyiaj, IC19 tus pin voltage yog ib txwm 2.66V, V6 yog nyob rau; txwv tsis pub, thaum tsis muaj load, IC19 tus pin yog 0.08V, V6 yog tawm), VD10, VD11 yog lit, cov ntaub ntawv muaj peev xwm yog 40%, 60%. Thaum tus nqi hluav taws xob faib hluav taws xob ntawm R40 thiab R41 nce mus rau 2.63V, IC15 tus pin yog sib npaug rau 2.63V, thiab tus pin thib 6 yog 2.63V tom qab lub resistor divider. Lub 7 tus pin tso tawm ib theem siab, thiab VD9 teeb, sib xws rau lub peev xwm them. Nws yog 80%. Tsuas yog thaum IC110 tus pin voltage yogNtau dua lossis sib npaug2.66V, the 8 pin outputs a high level, and the VD13 lights up, corresponding to a charging capacity of 100%. Even if VD13 is lit, VD12 is still flashing, which means the battery is still not fully saturated. Only when the IC18 pin voltage is >6.5V, VD12 yog maj mam extinguished, qhia tias lub roj teeb yog tag nrho them rau saturation.

VD16 ua raws li kev tiv thaiv overcharge thiab overcurrent hauv Circuit Court, thiab VD8 ua raws li kev tiv thaiv rov qab los tiv thaiv kev thim rov qab ntawm lub roj teeb tom qab lub charger raug kaw.

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