Koj puas paub MOSFET tsav tsheb Circuit Court?

MOSFET tsav tsheb Circuit Court yog ib feem tseem ceeb ntawm cov hluav taws xob hluav taws xob thiab hluav taws xob tsim hluav taws xob, uas yog lub luag haujlwm rau kev muaj peev xwm tsav txaus los xyuas kom meej tias MOSFET tuaj yeem ua haujlwm tau zoo thiab ntseeg tau. Hauv qab no yog cov ncauj lus kom ntxaws tsom xam ntawm MOSFET tsav tsheb circuits:

I. Lub luag haujlwm ntawm lub voj voog tsav

Muab lub peev xwm tsav txaus:Txij li thaum lub teeb liab tsav yog feem ntau muab los ntawm ib tug maub los (xws li DSP, microcontroller), tsav voltage thiab tam sim no yuav tsis txaus los ncaj qha tig lub MOSFET, yog li yuav tsum muaj ib tug tsav Circuit Court kom phim lub peev xwm tsav.

Xyuas kom zoo switching tej yam kev mob:Tus tsav tsheb Circuit Court yuav tsum xyuas kom meej tias MOSFETs tsis nrawm dhau los yog qeeb dhau thaum hloov pauv kom tsis txhob muaj teeb meem EMI thiab kev hloov pauv ntau dhau.

Xyuas kom ntseeg tau tias lub cuab yeej:Vim tias muaj cov kab mob parasitic ntawm kev hloov khoom siv, qhov hluav taws xob-tam sim no spikes yuav raug tsim thaum lub sij hawm conduction los yog tig-off, thiab tus neeg tsav tsheb Circuit Court yuav tsum tau suppress cov spikes los tiv thaiv lub Circuit Court thiab cov cuab yeej.

II. Hom tsav circuits

 

Cov neeg tsav tsheb tsis nyob ib leeg

Direct Drive:Txoj kev yooj yim tshaj plaws los tsav lub MOSFET yog txuas lub teeb liab tsav ncaj qha mus rau lub qhov rooj ntawm MOSFET. Txoj kev no tsim nyog rau lub sijhawm uas muaj peev xwm tsav tsheb txaus thiab qhov yuav tsum tau muaj kev sib cais tsis siab.

Bootstrap Circuit Court:Siv lub hauv paus ntsiab lus hais tias lub capacitor voltage tsis tuaj yeem hloov pauv sai sai, qhov hluav taws xob tau txiav tawm thaum lub MOSFET hloov nws lub xeev hloov, yog li tsav lub high-voltage MOSFET.Qhov kev qhia no feem ntau yog siv nyob rau hauv cov xwm txheej uas MOSFET tsis tuaj yeem sib koom ua ke nrog cov hauv paus ntsiab lus. tsav tsheb IC, xws li BUCK circuits.

Isolated Tsav

Optocoupler cais:Kev rho tawm ntawm lub teeb liab tsav los ntawm lub ntsiab Circuit Court yog ua tiav los ntawm optocouplers. Optocoupler muaj qhov zoo ntawm kev sib cais hluav taws xob thiab muaj zog tiv thaiv kev cuam tshuam, tab sis cov lus teb zaus yuav raug txwv, thiab lub neej thiab kev ntseeg siab yuav raug txo qis hauv cov xwm txheej hnyav.

Transformer cais:Kev siv cov transformers kom ua tiav qhov kev sib cais ntawm lub teeb liab tsav los ntawm lub ntsiab Circuit Court. Transformer cais tawm muaj qhov zoo ntawm cov lus teb zoo siab, kev sib cais siab, thiab lwm yam, tab sis tus qauv tsim yog qhov nyuaj thiab raug rau cov kab mob parasitic.

Thib peb, tsim cov ntsiab lus ntawm kev tsav tsheb

Tsav Voltage:Nws yuav tsum tau xyuas kom meej tias qhov tsav voltage siab tshaj qhov pib voltage ntawm MOSFET kom ntseeg tau tias MOSFET tuaj yeem ua tau zoo. Nyob rau tib lub sijhawm, qhov tsav hluav taws xob yuav tsum tsis txhob siab dhau kom tsis txhob ua rau MOSFET.

Tsav tam sim no:Txawm hais tias MOSFETs yog cov khoom siv hluav taws xob uas muaj hluav taws xob thiab tsis tas yuav tsum tau tsav tam sim no ntau, lub ncov tam sim no yuav tsum tau lees paub txhawm rau kom ntseeg tau qee qhov kev hloov pauv ceev. Yog li ntawd, tus tsav tsheb Circuit Court yuav tsum muaj peev xwm muab lub ncov txaus tam sim no.

Tsav Resistor:Tus tsav resistor yog siv los tswj qhov kev hloov pauv ceev thiab txo qis tam sim no spikes. Kev xaiv ntawm tus nqi resistor yuav tsum yog raws li qhov tshwj xeeb Circuit Court thiab cov yam ntxwv ntawm MOSFET. Feem ntau, tus nqi resistor yuav tsum tsis txhob loj dhau los yog me me kom tsis txhob cuam tshuam rau kev tsav tsheb thiab kev ua haujlwm hauv Circuit Court.

PCB Layout:Thaum lub sij hawm PCB layout, qhov ntev ntawm kev sib dhos ntawm cov tsav tsheb Circuit Court thiab lub rooj vag MOSFET yuav tsum tau luv kom ntau li ntau tau, thiab qhov dav ntawm qhov kev sib dhos yuav tsum tau nce ntxiv kom txo tau qhov cuam tshuam ntawm cov kab mob parasitic inductance thiab kev tiv thaiv ntawm kev tsav tsheb. Nyob rau tib lub sijhawm, cov khoom tseem ceeb xws li tsav cov resistors yuav tsum tau muab tso ze rau ntawm lub rooj vag MOSFET.

IV. Piv txwv ntawm kev siv

MOSFET tsav tsheb circuits yog siv dav hauv ntau yam khoom siv hluav taws xob hluav taws xob thiab cov khoom siv hluav taws xob, xws li hloov cov khoom siv hluav taws xob, inverter, thiab lub cev muaj zog. Hauv cov ntawv thov no, kev tsim thiab kev ua kom zoo ntawm cov tsav tsheb circuits yog qhov tseem ceeb los txhim kho kev ua tau zoo thiab kev ntseeg siab ntawm cov khoom siv.

Hauv cov ntsiab lus, MOSFET tsav tsheb Circuit Court yog ib qho tseem ceeb ntawm cov hluav taws xob hluav taws xob thiab kev tsim hluav taws xob. Los ntawm kev tsim qauv tsav tsheb, nws tuaj yeem ua kom ntseeg tau tias MOSFET ua haujlwm ib txwm muaj thiab ntseeg tau, yog li txhim kho kev ua haujlwm thiab kev ntseeg siab ntawm tag nrho lub voj voog.