Nei zvichigara zvakaoma kuyedza simba repamusoro reMOSFET kushandiswa uye kutsiva nemultimeter?

Nezve high-power MOSFET yanga iri imwe yeinjiniya inoda kukurukura nyaya, saka takaronga ruzivo rwakajairwa uye rusina kujairika rwe.MOSFET, ndinotarisira kubatsira mainjiniya. Ngatitaure nezve MOSFET, chikamu chakakosha!

Anti-static kudzivirira

Yakakwira-simba MOSFET insulated gedhi remunda wekuita chubhu, gedhi harina rakananga razvino dunhu, iyo impedance yekupinza yakakwira zvakanyanya, zviri nyore kwazvo kukonzera static charge aggregation, zvichikonzera kuti yakakwira voltage ichava gedhi uye kunobva iyo insulating layer pakati pekuputsika.

Mazhinji ekutanga kugadzirwa kweMOSFET haana anti-static matanho, saka chenjera kwazvo mukuchengetwa uye kushandiswa, kunyanya maMOSFET emagetsi madiki, nekuda kwesimba diki rekuisa reMOSFET kugona kudiki, kana rakafumurwa kumagetsi static rinogadzira a. yakakwirira voltage, zviri nyore kukonzerwa nekuparara kwe electrostatic.

Iyo ichangoburwa yekusimudzira-yepamusoro-simba MOSFET mutsauko wakakura, chekutanga, nekuda kwebasa rehombe yekupinza capacitance yakakura zvakare, zvekuti kusangana nemagetsi akamira kune nzira yekuchaja, inokonzeresa kudiki voltage, zvichikonzera kuparara. yekugona kwezvidiki, uyezve zvakare, ikozvino yakakwirira-simba MOSFET mugedhi remukati uye kunobva gedhi uye sosi yeakadzivirirwa regulator DZ, iyo static yakanyudzwa mukuchengetedzwa kweiyo. regulator diode voltage regulator kukosha Pazasi, nyatso chengetedza gedhi uye sosi yeiyo insulating layer, simba rakasiyana, mhando dzakasiyana dzeMOSFET dziviriro regulator diode voltage regulator kukosha kwakasiyana.

Kunyangwe yakakwirira-simba MOSFET yemukati kudzivirira matanho, isu tinofanirwa kushanda zvinoenderana neanopesana-static maitiro ekushanda, inova inova inokwanisa kugadzirisa vashandi vanofanirwa kuve nayo.

Kuonekwa uye kutsiviwa

Mukugadzirisa terevhizheni nemidziyo yemagetsi, ichasangana nekukanganisa kwakasiyana kwechikamu,MOSFETiriwo pakati pavo, ndiko kuti vashandi vedu vekuchengetedza vashandise sei inowanzoshandiswa multimeter kuona zvakanaka nezvakaipa, zvakanaka nezvakaipa MOSFET. Mukutsiva kweMOSFET kana pasina mugadziri mumwe chete uye muenzaniso wakafanana, maitiro ekutsiva dambudziko.

1, yakakwirira-simba MOSFET bvunzo:

Sevashandi vemagetsi ekugadzirisa TV muyero yekristaro transistors kana diode, kazhinji vachishandisa yakajairwa multimeter kuona yakanaka uye yakaipa transistors kana diode, kunyangwe kutonga kweiyo transistor kana diode magetsi paramita hakugone kusimbiswa, asi chero iyo nzira ndeyechokwadi yekusimbiswa kwekristaro transistors "yakanaka" uye "yakaipa" kana "yakaipa" yekusimbisa kwekristaro transistors. "Zvakaipa" kana kuti hapana dambudziko. Saizvozvo, MOSFET inogona zvakare kuve

Kuisa iyo multimeter kuona yayo "yakanaka" uye "yakaipa", kubva kune yakajairika kugadzirisa, inogona zvakare kusangana nezvinodiwa.

Kuongorora kunofanirwa kushandisa pointer mhando multimeter (digital mita haina kukodzera kuyera semiconductor zvishandiso). Kune simba-mhando MOSFET switching chubhu ndeyeN-channel yekusimudzira, zvigadzirwa zvevagadziri zvinenge zvese kushandisa imwechete TO-220F package fomu (inoreva switching power supply yesimba re50-200W yemunda effect switching chubhu) , iyo matatu electrode kurongeka kunopindirana zvakare, ndiko kuti, iyo mitatu

Pini pasi, dhinda modhi yakatarisana neyako, yeruboshwe yepini yegedhi, yekurudyi yepini yekuyedza kunobva, yepakati yepini yekudhonza.

(1) multimeter uye gadziriro dzakabatana:

Chokutanga pane zvose, kusati kwayera kunofanira kukwanisa kushandisa multimeter, kunyanya kushandiswa kweohm gear, kunzwisisa ohm block ichava iko kushandiswa kweohm block kuyera crystal transistor uyeMOSFET.

Iine multimeter ohm block ohm center scale haigoni kuva yakakura, zvichida isingasviki 12 Ω (500-type tafura ye12 Ω), kuitira kuti muR × 1 block inogona kuva yakakura ikozvino, yePN junction yemberi. maitiro emutongo akanyatsojeka. Multimeter R × 10K block yemukati bhatiri yakanyanya kukura kupfuura 9V, zvekuti mukuyera iyo PN junction inverse leakage ikozvino yakanyatsojeka, zvikasadaro kuvuza hakugone kuyerwa.

Zvino nekuda kwekufambira mberi kwemaitiro ekugadzira, kuongorora fekitori, kuyedzwa kwakasimba, isu tinowanzo tonga chero mutongo weMOSFET usingabvi, usingapazi nepakati pfupi, iyo yemukati isiri-inotenderera, inogona yakawedzerwa munzira, iyo nzira iri nyore kwazvo:

Kushandisa multimeter R × 10K block; R × 10K block yemukati bhatiri inowanzo 9V pamwe ne1.5V kusvika 10.5V iyi voltage inowanzoonekwa seyakakwana PN junction inversion leakage, chinyoreso chitsvuku chemultimeter hachigoneki (chakabatana neiyo negative terminal yebhatiri remukati), iyo dema peni ye multimeter yakanaka kugona (yakabatana kune yakanaka terminal yebhatiri remukati).

(2) Test maitiro:

Batanidza peni dzvuku kune kunobva MOSFET S; batanidza peni dema kumvura yeMOSFET D. Panguva ino, chiratidzo chetsono chinofanira kunge chisingagumi. Kana paine ohmic index, zvichiratidza kuti chubhu iri pasi pekuyedzwa ine kuputika kwechiitiko, iyi chubhu haigone kushandiswa.

Chengetedza mamiriro ari pamusoro; panguva ino ine 100K ~ 200K resistor yakabatana negedhi uye dhiraivha; panguva ino tsono inofanirwa kuratidza huwandu hweohms iyo idiki zvirinani, kazhinji inogona kuratidzwa kune 0 ohms, panguva ino ichaji yakanaka kuburikidza ne100K resistor paMOSFET gedhi kuchaja, zvichikonzera gedhi remagetsi, nekuda iyo yemagetsi munda inogadzirwa neiyo conductive chiteshi ichikonzera kudhiraivha uye sosi conduction, saka iyo multimeter yetsono deflection, deflection angle yakakura (Ohm's index is. diki) kuratidza kuti kuita kwekuburitsa kwakanaka.

Uyezve yakabatana kune inopikisa yakabviswa, ipapo iyo multimeter pointer inofanirwa kunge ichiri MOSFET pane index inoramba isina kuchinjika. Kunyangwe iyo resistor kuti ibvise, asi nekuti iyo resistor kugedhi inopomerwa nechaji haina kunyangarika, gedhi remagetsi munda rinoramba richichengetedza mukati conductive chiteshi ichiri kuchengetedzwa, inova maitiro eiyo insulated gedhi mhando MOSFET.

Kana resistor kubvisa tsono zvishoma nezvishoma uye zvishoma nezvishoma kudzokera yakakwirira kuramba kana kunyange kudzokera risingaperi, kufunga kuti kuyerwa chubhu gedhi leakage.

Panguva ino ine waya, yakabatana negedhi uye sosi yechubhu iri pasi pekuyedzwa, iyo multimeter's pointer yakabva yadzokera kune infinity. Kubatanidzwa kwewaya kuitira kuti yakayerwa MOSFET, gedhi rekuchajisa kuburitswa, iyo yemukati yemagetsi munda inonyangarika; conductive chiteshi zvakare inonyangarika, saka iyo yekudonhedza uye sosi pakati pekupokana uye isingaperi.

2, yakakwirira-simba MOSFET kutsiva

Mukugadzirisa terevhizheni uye marudzi ese emidziyo yemagetsi, kusangana nekukuvara kwechikamu kunofanirwa kutsiviwa nemhando imwechete yezvikamu. Zvisinei, dzimwe nguva zvikamu zvakafanana hazvisi paruoko, zvakakosha kushandisa mamwe marudzi ekutsiva, kuitira kuti tinofanira kufunga nezvese maitiro ekuita, parameters, dimensions, nezvimwewo, zvakadai seterevhizheni mukati memutsara wekubuda chubhu, se. Kureba sekutariswa kwevoltage, yazvino, simba rinogona kuisirwa (mutsara wekubuda chubhu inenge yakaenzana mativi echitarisiko), uye simba rinoita kunge rakakura uye nani.

Zvekutsiva MOSFET, kunyangwe iyiwo musimboti, zvakanakisa prototype yakanyanya kunaka, kunyanya, usatevere simba rekuve rakakura, nekuti simba rakakura; kuisa capacitance yakakura, yakashandurwa uye maseketi ekusimudzira haaenderane nekunakidzwa kwechaji ikozvino inomisa resistor yedunhu rekudiridza yehukuru hwekupokana kukosha uye kugona kwekupinza kweMOSFET kune chekuita nekusarudzwa kwesimba rehombe kunyangwe kugona kwehombe, asi iyo yekupinza capacitance yakakurawo, uye iyo yekupinza capacitance yakakurawo, uye simba harina hombe.

Input capacitance yakakurawo, iyo yekunakidzwa dunhu haina kunaka, izvo zvinozoita kuti MOSFET ishande nekudzima kuita zvakanyanya. Inoratidza kutsiva kwemamodheru akasiyana eMOSFET, tichifunga nezve kugona kwekupinza kweiyi parameter.

Semuenzaniso, kune 42-inch LCD TV backlight yakakwira-voltage board kukuvadzwa, mushure mekutarisa yemukati-yakakwirira-simba MOSFET kukuvara, nekuti hapana prototype nhamba yekutsiva, sarudzo yevoltage, yazvino, simba haisi shoma pane. iyo yepakutanga MOSFET kutsiva, mhedzisiro ichubhu yebacklight inoita kunge inoramba ichipenya (kutanga kunetseka), uye pakupedzisira yakatsiviwa nemhando imwechete yepakutanga kugadzirisa dambudziko.

Yaonekwa kukuvadzwa kune-high-simba MOSFET, kutsiva kwezvikamu zvayo zveparipheral yedunhu reperfusion kunofanirwawo kutsiviwa, nekuti kukuvadzwa kweMOSFET kunogona kunge kuri kushata kutenderera kwedunhu kunokonzerwa nekukuvadzwa kweMOSFET. Kunyangwe iyo MOSFET pachayo ikakuvadzwa, nguva iyo MOSFET yaparara, iyo perfusion yedunhu zvikamu zvinokuvadzwa uye inofanira kutsiviwa.

Sezvo isu tine akawanda akangwara ekugadzirisa tenzi mukugadzirisa kweA3 switching power supply; chero bedzi chubhu yekushandura ichionekwa kuti yaparara, iriwo mberi kwe2SC3807 excitation chubhu pamwe chete nekutsiviwa kwechikonzero chimwe chete (kunyangwe 2SC3807 chubhu, yakayerwa nemultimeter yakanaka).