Ndezvipi zvikonzero zvekupisa muMOSFET ye inverter?

Iyo inverterMOSFETsshanda mumamiriro ekuchinja uye ikozvino inoyerera kuburikidza nemachubhu yakakwirira kwazvo. Kana iyo chubhu isina kusarudzwa nemazvo, iyo yekutyaira voltage amplitude haina kukura zvakakwana kana kudziya kwedunhu kupisa hakuna kunaka, zvinogona kukonzera kuti MOSFET kupisa.

 

1, inverter MOSFET kudziyisa kwakakomba, inofanirwa kutarisisa kusarudzwa kweMOSFET

MOSFET mune inverter iri munzvimbo inochinja, kazhinji inoda kudonhedza kwayo ikozvino yakakura sezvinobvira, pa-kupikisa idiki sezvinobvira, iyo inogona kuderedza saturation voltage kudonha kwechubhu, nekudaro ichidzikisa chubhu kubva pakudyiwa, kuderedza kupisa.

Tarisa bhuku reMOSFET, tichaona kuti iyo yakakwirira yekumira kwevoltage kukosha kweMOSFET, iyo yakakura-kuramba, uye avo vane yakakwira dhizaini ikozvino uye yakaderera inomira voltage kukosha kwechubhu, kupokana kwayo kunowanzo kuve pasi pemakumi emakumi. mamiriyoni.

Tichifunga mutoro wazvino we5A, isu tinosarudza inverter inowanzo shandiswa MOSFET RU75N08R uye voltage inomira kukosha kwe500V 840 inogona kuve, iyo drain yavo ikozvino iri mu5A kana kupfuura, asi-kupokana kwemachubhu maviri akasiyana, tyaira zvakafanana zvazvino. , kusiyana kwavo kwekupisa kwakakura zvikuru. 75N08R pa-resistance inongova 0.008Ω, nepo pa-resistance ye840 iri 0.85Ω, kana mutoro uripo uchiyerera nemuchubhu uri 5A, 75N08R chubhu inodonha ingori 0.04V, panguva ino, iyo MOSFET chubhu inoshandiswa. chete 0.2W, nepo 840 chubhu inodonha inogona kusvika ku4.25W, iyo chubhu inoshandiswa yakakwira se21.25W. Kubva pane izvi zvinogona kuoneka, iyo idiki iyo pa-kupokana kweiyo inverter's MOSFET ndiyo iri nani, iyo pa-resistance yechubhu yakakura, iyo tube inoshandiswa pasi pepamusoro ikozvino Kupokana kweMOSFET kweiyo inverter kudiki. sezvinobvira.

 

2, dhiraivha yekutyaira yekutyaira voltage amplitude haina kukura zvakakwana

MOSFET chishandiso chekudzora magetsi, kana iwe uchida kuderedza kushandiswa kwechubhu, kuderedza kupisa,MOSFETgedhi drive voltage amplitude inofanirwa kunge yakakura zvakakwana kuti ityaire pulse mupendero kuti ukwire uye wakatwasuka, unogona kudzikisa kudonha kwechubhu, kuderedza kushandiswa kwechubhu.

 

3, MOSFET kupisa kupisa haisi chikonzero chakanaka

InverterMOSFETkudziyisa kwakakomba. Sezvo inverter MOSFET simba rekushandisa rakakura, basa rinowanzoda yakakura yakakwana yekunze nzvimbo yeheatsink, uye yekunze heatsink uye MOSFET pachayo pakati peheatsink inofanirwa kunge iri padhuze ne (kazhinji inodiwa kuti iputirwe ne thermally conductive silicone girisi. ), kana heatsink yekunze iri diki, kana kusangana neMOSFET's own heatsink isiri pedyo zvakakwana, inogona kutungamira mukudziya kwechubhu.

 

Inverter MOSFET kupisa zvakakomba pane zvikonzero zvina zvepfupiso.

Kupisa kushoma kweMOSFET chinhu chakajairwa, asi kupisa kwakanyanya, kunyangwe kutungamirira kuchubhu kunopiswa, pane zvikonzero zvina zvinotevera:

 

1, dambudziko rekugadzira dunhu

Rega iyo MOSFET ishande mumutsara wekushanda mamiriro, pane yekuchinja yedunhu. Icho zvakare chimwe chezvikonzero zvekupisa kweMOSFET. Kana iyo N-MOS iri kuita switching, iyo G-level voltage inofanirwa kunge iri V shoma yakakwira pane iyo magetsi kuti ishande zvizere, nepo P-MOS iri kupesana. Haina kuvhurika zvizere uye kudonha kwemagetsi kwakakura zvakanyanya zvichikonzera kushandiswa kwesimba, iyo yakaenzana DC impedance yakakura, kudonha kwevoltage kunowedzera, saka U * Iniwo ndinowedzera, kurasikirwa kunoreva kupisa. Ichi ndicho chikanganiso chakadziviswa mukugadzirwa kwedunhu.

 

2, yakawandisa frequency

Chikonzero chikuru ndechekuti dzimwe nguva kutsvaga kwakanyanya kwehuwandu, zvichikonzera kuwedzera frequency, kurasikirwa kweMOSFET pane yakakura, saka kupisa kunowedzerawo.

 

3, kusakwana kwekupisa kwekugadzira

Kana iyo yazvino yakakwira zvakanyanya, iyo yezita ikozvino kukosha kweMOSFET, kazhinji inoda yakanaka kupisa dissipation kuti iwane. Saka iyo ID ishoma pane yakanyanya ikozvino, inogona zvakare kupisa zvakanyanya, inoda yakakwana yekubatsira kupisa sink.

 

4, kusarudzwa kweMOSFET kwakashata

Kurasika kwekutonga kwesimba, MOSFET yemukati kuramba haina kutariswa zvizere, zvichikonzera kuwedzera kwekuchinja impedance.