Ndezvipi zvikonzero zve inverter MOSFET kupisa?

Iyo inverter's MOSFET inoshanda mune inochinja mamiriro uye yazvino inoyerera kuburikidza neMOSFET yakakwira zvakanyanya. Kana iyo MOSFET isina kusarudzwa nemazvo, iyo yekutyaira voltage amplitude haina kukura zvakaringana kana dunhu kupisa kupisa hakuna kunaka, zvinogona kukonzera kuti MOSFET kupisa.

 

1, inverter MOSFET kudziyisa yakakomba, inofanirwa kuterera kuneMOSFETsarudzo

MOSFET mune inverter mukuchinja mamiriro, kazhinji inoda kudonhedza kwayo ikozvino kwakakura sezvinobvira, pa-kupikisa diki sezvinobvira, kuitira kuti ugone kuderedza saturation voltage kudonha kweMOSFET, nekudaro kuderedza MOSFET kubva pakudyiwa, kuderedza kupisa.

Tarisa bhuku reMOSFET, tinoona kuti iyo yakakwirira yekumira kwevoltage kukosha kweMOSFET, iyo yakakura kupikisa kwayo, uye iyo ine yakanyanya kudonha ikozvino, yakaderera inomira voltage kukosha kweMOSFET, kupikisa kwayo kunowanzo pasi pemakumi emakumi. mamiriyoni.

Tichifungidzira kuti mutoro wazvino we5A, tinosarudza inverter inowanzo shandiswa MOSFETRU75N08R uye inomira kukosha kwevoltage ye500V 840 inogona kuve, iyo drain yavo ikozvino iri mu5A kana kupfuura, asi-kupokana kwemaMOSFET maviri akasiyana, tyaira zvakafanana zvazvino. , kusiyana kwavo kwekupisa kwakakura zvikuru. 75N08R pa-resistance inongova 0.008Ω, nepo pa-resistance ye840 Iyo pa-resistance ye75N08R ingori 0.008Ω, nepo pa-resistance ye840 iri 0.85Ω. Kana mutoro uripo uchiyerera nemuMOSFET uri 5A, kudonha kwevoltage ye75N08R's MOSFET ingori 0.04V, uye kushandiswa kweMOSFET kweMOSFET kunongova 0.2W, ukuwo kudonha kwe840's MOSFET kunogona kusvika ku4.25W, uye kushandiswa. yeMOSFET yakakwira se21.25W. Kubva pane izvi, zvinogona kuoneka kuti-kupokana kweMOSFET kwakasiyana ne-on-resistance ye75N08R, uye chizvarwa chavo chekupisa chakasiyana zvakanyanya. Iyo idiki yekupokana kweMOSFET, zviri nani, iyo-kupokana kweMOSFET, iyo MOSFET chubhu pasi pekushandisa kwakanyanya ikozvino yakakura.

 

2, dhiraivha yekutyaira yekutyaira voltage amplitude haina kukura zvakakwana

MOSFET mudziyo wekudzora magetsi, kana uchida kudzikisa MOSFET chubhu kushandiswa, kuderedza kupisa, MOSFET gate drive voltage amplitude inofanira kunge yakakura zvakakwana, kutyaira pulse edge kusvika pamawere, inogona kuderedzaMOSFETchubhu voltage kudonha, kuderedza MOSFET chubhu kushandiswa.

 

3, MOSFET kupisa kupisa haisi chikonzero chakanaka

Inverter MOSFET kupisa kwakakomba. Sezvo inverter MOSFET chubhu mashandisirwo akakura, basa racho rinowanzoda yakakura yakakwana nzvimbo yekunze yekunyura kwekupisa, uye yekupisa yekunyura yekunze uye MOSFET pachayo pakati pekupisa sink inofanirwa kunge iri padhuze (inowanzo kudiwa kuti ivharwe ne thermally conductive. silicone girisi), kana singi yekupisa yekunze iri diki, kana neMOSFET pachayo isiri padhuze zvakakwana pakubata kwekunyura kwekupisa, inogona kutungamira mukudziya kweMOSFET.

Inverter MOSFET kupisa zvakakomba pane zvikonzero zvina zvepfupiso.

MOSFET kushoma kudziyisa chinhu chakajairika, asi kupisa kwakakomba, uye kunyange kutungamirira kuMOSFET 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 kuwanda,MOSFETkurasikirwa 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.