Zvinokonzera uye Kudzivirira kweMOSFET Kukundikana

Zvikonzero zvikuru zviviriof MOSFET kukundikana:

Voltage kutadza: ndiko kuti, iyo BVdss voltage pakati pedhiraini uye sosi inodarika yakayerwa voltage yeMOSFET uye inosvika imwe nzvimbo, zvichiita kuti MOSFET ikunde.

Gedhi Voltage Kukundikana: Gedhi rinotambura neabnormal voltage spike, zvichikonzera kutadza kwegedhi reokisijeni.

Zvinokonzera uye Kudzivirirwa kweMOSFET Kukundikana

Kudonha kukanganisa (voltage kutadza)

Chii chaizvo chinonzi avalanche kukuvara? Kungotaura,a MOSFET inzira yekukundikana yakagadzirwa nepamusoro-soro pakati pemabhazi voltages, transformer reflection voltages, leakage spike voltages, nezvimwewo uye MOSFET. Muchidimbu, iko kutadza kwakajairwa kunoitika kana voltage iri padhireni-source pole yeMOSFET inodarika kukosha kwayo kwakatarwa uye inosvika pane imwe simba.

Matanho ekudzivirira kukuvara kweavalanche:

-Deredzai dosage zvakakodzera. Muindasitiri iyi, inowanzoderedzwa ne80-95%. Sarudza zvichienderana nekambani yewaranti mazwi uye mutsara wezvakakosha.

-Reflective voltage inonzwisisika.

-RCD, TVS absorption yedunhu dhizaini inonzwisisika.

-Yakakwirira ikozvino wiring inofanira kuva yakakura sezvinobvira kuderedza parasitic inductance.

-Sarudza yakafanira gedhi resistor Rg.

-Wedzera RC damping kana Zener diode absorption yemhando yepamusoro magetsi sezvinodiwa.

Zvinokonzera uye Kudzivirirwa kweMOSFET Kukundikana (1)

Gedhi Voltage Kukundikana

Pane zvinhu zvitatu zvinokonzeresa zvegridhi zvakawandisa zvisingaite: static magetsi panguva yekugadzira, yekufambisa uye kusangana; high voltage resonance inogadzirwa neparasitic parameter yemidziyo uye maseketi panguva yekushanda kwesimba system; uye kutapurirana kwemagetsi akakwira kuburikidza neGgd kuenda kugridi panguva yekuvhunduka kukuru (chikanganiso chinowanzoitika panguva yekuyedzwa kwemheni).

Matanho ekudzivirira gedhi voltage kukanganisa:

Overvoltage dziviriro pakati pegedhi uye sosi: Kana iyo impedance pakati pegedhi uye sosi yanyanya kukwira, iyo kamwe kamwe shanduko yevoltage pakati pegedhi uye sosi inosanganiswa kune gedhi kuburikidza necapacitance pakati pemagetsi, zvichikonzera yakakwira kwazvo UGS voltage pamusoro-regulation, zvichitungamirira kukudarika-mutemo wegedhi. Permanent oxidative kukuvara. Kana iyo UGS iri pamhepo yakanaka yenguva pfupi, chishandiso chinogona kukonzera kukanganisa. Pahwaro uhwu, iyo impedance yegedhi dhiraivha yedunhu inofanirwa kudzikiswa zvakafanira uye inonyorovesa resistor kana 20V inodzikamisa voltage inofanirwa kubatanidzwa pakati pegedhi nenzvimbo. Kunyanya kutarisirwa kunofanira kutorwa kudzivirira kuvhurika kwegonhi kushanda.

Overvoltage dziviriro pakati pekuburitsa machubhu: Kana paine inductor mudunhu, kamwe-kamwe shanduko mukuvuza ikozvino (di/dt) kana iyo unit yadzimwa ichaita kuti leakage voltage overshoots zvakanaka pamusoro pemagetsi ekupa, zvichikonzera kukanganisa kuchikamu. Dziviriro inofanira kusanganisira Zener clamp, RC clamp, kana RC suppression circuit.