Inductors yog cov khoom siv hlau nplaum uas siv dav hauv kev hloov cov khoom siv hluav taws xob thiab lub zog hloov hluav taws xob. Lawv lub luag haujlwm tseem ceeb yog hloov hluav taws xob rau hauv lub zog sib nqus, khaws cia, thiab tso tawm thaum xav tau. Txawm hais tias inductors sib koom cov qauv zoo sib xws nrog cov transformers, lawv feem ntau siv ib qho winding thiab ua haujlwm nrog cov txheej txheem yooj yim.
Hauv boost-hom DC-DC converters, tus inductor lub cia-tso cov yam ntxwv ua rau lub hauv paus ntawm voltage nce. Tsab ntawv xov xwm no muab kev tsim vaj tsev- taw qhia kev tsom xam ntawm cov hauv paus ntsiab lus ntawm kev khiav hauj lwm hauv qab inductor-raws li boost converters, tsom rau kev hloov hluav taws xob hluav taws xob hluav taws xob, kev coj tus cwj pwm hluav taws xob thaum hloov pauv kev ua haujlwm, thiab kev txwv sib nqus saturation.
1. Kev hloov hluav taws xob hluav taws xob hauv inductors
Ib qho inductor tus cwj pwm tuaj yeem raug sau los ntawm ob lub tswv yim tseem ceeb:
• Hluav taws xob-rau-Magnetic Conversion (Energizing Phase)
Thaum tam sim no ntws los ntawm winding, ib tug magnetic teb daim ntawv, khaws cia lub zog nyob rau hauv lub tub ntxhais.
• Sib nqus-rau-Kev hloov hluav taws xob (De-theem zog)
Thaum txoj kev tam sim no cuam tshuam sai, qhov sib nqus sib nqus ua rau lub zog khaws cia rov qab rau hauv daim ntawv hluav taws xob.
Ob lub tshuab no tswj hwm lub inductor kev ua haujlwm hauv txhua qhov kev txhawb nqa topologies. Qhov tshwm sim tau yooj yim piav qhia los ntawm kev tshuaj xyuas ib qho yooj yim energized kauj, raws li qhia hauv qab no.
2. Voltage Rise Thaum lub sij hawm De-energizing Interval
Thaum txoj kev tam sim no qhib, lub inductor yuav tsum tswj xyuas qhov txuas tam sim no. Yog tias tsis muaj txoj hauv kev tawm, qhov hluav taws xob hla lub inductor nce siab heev - tsuas yog txwv los ntawm kev puas tsuaj los ntawm rwb thaiv tsev. Cov nyhuv no muab cov inductors nrog lawv cov peev xwm txhawb nqa lub cev thiab piav qhia txog qhov polarity thim rov qab tau pom thaum lub caij sib nqus sib nqus.
Cov duab hauv qab no qhia txog tus cwj pwm no thaum lub sijhawm lub zog raug tshem tawm.
3. Basic Boost thiab Negative-Voltage Generation Circuits
Los ntawm lub sij hawm hloov lub inductor los ntawm energizing thiab de-energizing intervals, ib tug yooj yim boost conversion qauv yog tsim:
• ON theem: lub inductor khaws lub zog sib nqus.
• OFF theem: lub inductor tso tawm lub zog los ntawm ib lub diode, ua ib qho hluav taws xob ntau tshaj qhov input voltage.
Rov qab cov kev taw qhia rectifier ua rau tsis zoo -voltage tiam. Cov kab hluav taws xob tsawg no yog nyob ntawm lub hauv paus ntawm kev hloov pauv niaj hnub, suav nrog Boost, Buck-Boost, SEPIC, thiab Flyback.
Cov duab hauv qab no qhia txog qhov tsawg kawg nkaus qhov zoo thiab qhov tsis zoo ntawm lub tshuab hluav taws xob hluav taws xob.
4. Kev siv tswv yim siv cov khoom siv hluav taws xob semiconductor
Hauv kev siv hluav taws xob siv hluav taws xob, cov khoom siv hluav taws xob hloov pauv los ntawm cov khoom siv semiconductor xws li MOSFETs thiab BJTs. Qhov no tso cai rau siab - zaus hloov pauv thaum khaws cia tib lub zog hauv qab- hloov physics. Cov duab yooj yim hauv qab no qhia txog qhov kev hloov pauv no.
5. Sib Nqus Saturation: Kev Ua Haujlwm Txwv
Lub inductor lub zog cia muaj peev xwm yog txwv los ntawm cov khoom siv hlau nplaum. Saturation tshwm sim thaum cov tub ntxhais mus txog qhov siab tshaj plaws flux ceev, ua rau cov hauv qab no:
• Kev poob qis sai ntawm inductance
• Ntsig nce nyob rau hauv tam sim no
• Ntau dua tooj liab thiab cov tub ntxhais poob
• Muaj peev xwm ua kom sov thiab hloov pauv - cov khoom tsis ua haujlwm
Tsis txhob saturation yuav tsum xaiv cov khoom tseem ceeb uas tsim nyog, tswj cov ripple tam sim no, thiab txhais cov zaus ua haujlwm tsim nyog.
Tus cwj pwm ntawm lub zog hloov pauv yog tsim los ntawm kev hloov hluav taws xob hluav taws xob hauv lub inductor. Kev nkag siab txog cov ntsiab cai no ua rau cov kws tshaj lij tuaj yeem txuas cov ntsiab lus mus rau ntau qhov kev hloov pauv cov qauv tsim thiab ua kom zoo dua cov khoom sib nqus xaiv rau qhov tiag - ntiaj teb tsim.
