Ni izihe mpamvu zitera ubushyuhe muri MOSFET ya inverter?

Inverter'sMOSFETSkora muburyo bwo guhinduranya kandi ikigezweho kinyura mumiyoboro ni ndende cyane. Niba umuyoboro udahisemo neza, amplitude yo gutwara ibinyabiziga ntabwo ari nini bihagije cyangwa gukwirakwiza ubushyuhe bwumuzunguruko ntabwo ari byiza, birashobora gutuma MOSFET ishyuha.

1, inverter MOSFET gushyushya birakomeye, bigomba kwitondera guhitamo MOSFET

MOSFET muri inverter muburyo bwo guhinduranya, mubisanzwe isaba imiyoboro yayo yinini nini ishoboka, irwanya-ntoya ishoboka, ishobora kugabanya umuvuduko wamashanyarazi wumuyoboro wigituba, bityo bikagabanya umuyoboro kuva ukoreshejwe, kugabanya ubushyuhe.

Reba imfashanyigisho ya MOSFET, tuzasanga ko urwego rwo hejuru rwihanganira agaciro ka voltage ya MOSFET, niko arirwo rwinshi rurwanya, hamwe nabafite imiyoboro myinshi yumuvuduko mwinshi hamwe n’umuvuduko muke w’umuvuduko w’igituba, kurwanywa kwarwo muri rusange munsi ya mirongo. miliohms.

Dufashe ko umutwaro uremereye wa 5A, duhitamo inverter ikunze gukoreshwa MOSFET RU75N08R na voltage ihangana nagaciro ka 500V 840 irashobora kuba, imiyoboro yabyo iri muri 5A cyangwa irenga, ariko on-resistance ya tebes zombi ziratandukanye, gutwara imiyoboro imwe , itandukaniro ryubushyuhe bwabo nini cyane. 75N08R kuri-resistance ni 0.008Ω gusa, mugihe kuri-kurwanya-840 ni 0,85Ω, mugihe umutwaro wumutwaro unyura muri tube ari 5A, 75N08R ya voltage yamashanyarazi ni 0.04V gusa, muriki gihe, ikoreshwa rya MOSFET ni 0.2W gusa, mugihe 840 ya voltage yamashanyarazi ishobora kugera kuri 4.25W, ikoreshwa ryumuyoboro ni 21.25W. Uhereye kuri ibi birashobora kugaragara, ntoya kuri on-resistance ya MOSFET ya inverter ninziza, on-resistance ya tube nini, gukoresha imiyoboro munsi yumuyaga mwinshi Kurwanya-MOSFET ya inverter ni nto bishoboka.

2, umuzunguruko wo gutwara voltage amplitude yo gutwara ntabwo ari nini bihagije

MOSFET nigikoresho cyo kugenzura voltage, niba ushaka kugabanya ikoreshwa rya tube, gabanya ubushyuhe,BYINSHIamarembo yo gutwara amarembo amplitude agomba kuba manini bihagije kugirango atware impanuka ya pulse kugirango ihanamye kandi igororotse, urashobora kugabanya igitutu cya voltage, kugabanya ikoreshwa rya tube.

3, GUKURIKIRA ubushyuhe bwinshi ntabwo arimpamvu nziza

InverterBYINSHIgushyushya birakomeye. Nkuko inverter MOSFET ikoresha ingufu nini, akazi muri rusange gasaba umwanya munini uhagije wo hanze wa heatsink, kandi ubushyuhe bwo hanze hamwe na MOSFET ubwayo hagati ya heatsink bigomba kuba bifitanye isano ya hafi (mubisanzwe bisabwa gushyirwaho amavuta ya silicone yubushyuhe. ), niba ubushyuhe bwo hanze ari buto, cyangwa guhura na MOSFET ya heatsink yonyine ntabwo yegeranye bihagije, birashobora gutuma hashyuha.

Inverter MOSFET gushyushya bikomeye hari impamvu enye zincamake.

GUSHYUSHA CYANE ni ibintu bisanzwe, ariko gushyushya cyane, ndetse biganisha kuri tube birashya, hari impamvu enye zikurikira:

1, ikibazo cyo gushushanya umuziki

Reka MOSFET ikore kumurongo ukora, aho kugirango uhindure imizunguruko. Ninimwe mubitera ubushyuhe bwa MOSFET. Niba N-MOS ikora guhinduranya, ingufu za G-urwego zigomba kuba nkeya V hejuru yumuriro w'amashanyarazi kugirango ube wuzuye, mugihe P-MOS itandukanye. Ntabwo ifunguye neza kandi igitonyanga cya voltage nini cyane bigatuma ukoresha ingufu, ihwanye na DC impedance nini, kugabanuka kwa voltage kwiyongera, nuko U * I nayo iriyongera, igihombo bivuze ubushyuhe. Iri ni ikosa ryirindwa cyane mugushushanya umuzenguruko.

2, hejuru cyane yumurongo

Impamvu nyamukuru nuko burigihe rimwe na rimwe gukurikirana birenze urugero, bikavamo kwiyongera inshuro nyinshi, igihombo cya MOSFET kuri kinini, bityo ubushyuhe nabwo bukiyongera.

3, ntabwo igishushanyo mbonera gihagije

Niba ikigezweho ari kinini cyane, izina ryizina rya MOSFET, mubisanzwe bisaba ubushyuhe bwiza bwo kubigeraho. Indangamuntu rero ntabwo iri munsi yikigereranyo kinini, irashobora kandi gushyuha nabi, ikenera ibyuma bifasha ubushyuhe buhagije.

4, guhitamo MOSFET ni bibi

Gucira imanza nabi imbaraga, MOSFET yo kurwanya imbere ntabwo isuzumwa neza, bigatuma habaho impedance yo guhinduranya.