Kodi Ubwino wa Power MOSFET ndi Chiyani?

Kodi Ubwino wa Power MOSFET ndi Chiyani?

Nthawi Yotumiza: Dec-05-2024
Ma MOSFET amphamvu akhala chida chosankhidwa mumagetsi amakono amagetsi, akusintha makampani ndi mawonekedwe awo apamwamba kwambiri. Kusanthula mwatsatanetsatane uku kumawunikira zabwino zambiri zomwe zimapangitsa kuti ma MOSFET amphamvu akhale ofunikira pamakina amakono amagetsi.

1. Ntchito Yoyendetsedwa ndi Voltage

Mosiyana ndi ma bipolar junction transistors (BJTs) omwe ndi zida zoyendetsedwa ndipano, ma MOSFET amphamvu amawongoleredwa ndi magetsi. Khalidwe lofunikirali lili ndi maubwino angapo:

  • Zofunikira pagalimoto yosavuta
  • Kugwiritsa ntchito mphamvu zochepa mumayendedwe owongolera
  • Kutha kusintha mwachangu
  • Palibe zovuta zina zakuwonongeka

Kuyerekeza kwa mabwalo a BJT ndi MOSFET gate drive

Chithunzi 1: Zosavuta zoyendetsera zipata za MOSFET poyerekeza ndi ma BJT

2. Superior Kusintha Magwiridwe

Ma MOSFET amphamvu amapambana pamasinthidwe apamwamba kwambiri, omwe amapereka zabwino zambiri kuposa ma BJT achikhalidwe:

Kusintha liwiro kuyerekeza pakati pa MOSFET ndi BJT

Chithunzi 2: Kusintha liwiro kuyerekezera pakati pa MOSFET ndi BJT

Parameter Mphamvu MOSFET BJT
Kusintha liwiro Mwachangu Kwambiri (ns range) Wapakati (μs osiyanasiyana)
Kusintha Zotayika Zochepa Wapamwamba
Maximum Kusintha pafupipafupi > 1MHz ~ 100 kHz

3. Kutentha Makhalidwe

Ma MOSFET amphamvu amawonetsa mawonekedwe apamwamba kwambiri omwe amathandizira kudalirika kwawo komanso magwiridwe antchito:

Makhalidwe a kutentha ndi kutentha kwapakati

Chithunzi 3: Kutentha kokwanira kwa RDS(pa) mu mphamvu za MOSFET

  • Positive kutentha kokwanira kumalepheretsa kutha kwa kutentha
  • Kugawana kwapano kwabwinoko pakugwirira ntchito limodzi
  • Kukhazikika kwapamwamba kwamafuta
  • Malo ogwiritsira ntchito otetezeka (SOA)

4. Kukana Padziko Lonse

Ma MOSFET amakono amphamvu amapeza kukana kwambiri kwa boma (RDS(pa)), zomwe zimadzetsa zabwino zingapo:

Mbiri yakale yakuwongolera kwa RDS(pa).

Chithunzi 4: Kusintha kwakale mu MOSFET RDS(pa)

5. Kuthekera kofanana

Ma MOSFET amphamvu amatha kulumikizidwa mosavuta molumikizana kuti agwire mafunde apamwamba, chifukwa cha kutentha kwawo kwabwino:

Ntchito yofanana ya MOSFETs

Chithunzi 5: Kugawana kwapano mu ma MOSFET olumikizidwa ofanana

6. Kukhwima ndi Kudalirika

Ma MOSFET amphamvu amapereka mawonekedwe olimba komanso odalirika:

  • Palibe vuto lachiwiri losweka
  • Inherent body diode kuteteza reverse voltage
  • Kukhoza kwabwino kwambiri kwa avalanche
  • Kuthekera kwakukulu kwa dV/dt

Kuyerekeza kwa Safe Operating Area

Chithunzi 6: Malo Ogwirira Ntchito Otetezedwa (SOA) kuyerekeza pakati pa MOSFET ndi BJT

7. Kugwiritsa Ntchito Ndalama

Ngakhale ma MOSFET amphamvu pawokha atha kukhala ndi mtengo wokwera wokwera poyerekeza ndi ma BJT, mapindu awo amtundu uliwonse nthawi zambiri amabweretsa kuchotsera mtengo:

  • Magalimoto osavuta amachepetsa kuchuluka kwa zigawo
  • Kuchita bwino kwambiri kumachepetsa zofunikira zoziziritsa
  • Kudalirika kwakukulu kumachepetsa ndalama zosamalira
  • Kukula kwakung'ono kumathandizira mapangidwe ophatikizika

8. Zochitika Zam'tsogolo ndi Kuwongolera

Ubwino wa mphamvu za MOSFET zikupitilizabe kuyenda bwino ndi kupita patsogolo kwaukadaulo:

Zochitika zamtsogolo muukadaulo wa MOSFET

Chithunzi 7: Chisinthiko ndi mtsogolo mwaukadaulo wa MOSFET