Welcome to electrical and electronics engineering Q&A site...

Welcome to electrical and electronics engineering discussion website, Please login or register to continue.

Join our WhatsApp group

Subscribe To Our YouTube Channel

664 views
in Unit 1 by
Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?

Amazon Shopping

Please log in or register to answer this question.

1 Answer

0 votes
by

Parasitic Diode:

The parasitic diode is in between drain and source. The MOSFET structure itself contains parasitic diode or body drain diode. This parasitic diode allows the reverse flow of current when the MOSFET is in off state. The figure shows the internal parasitic diode. This parasitic diode have slow switching characteristics as compare to MOSFET channel. The integral diode have slow reverse recovery characteristics. In parasitic diode, drain acts as cathode and source acts as the anode. The integral diode have pn-n+.


image


Use of parasitic diode:

This parasitic diode is useful in the flow of reverse current in the inverter with an inductive load.


image


Parasitic BJT:

MOSFET structure also have parasitic BJT. The figure shows parasitic BJT. The n-channel MOSFET will have npn parasitic transistor. The body region of MOSFET acts as the base of BJT, the source of MOSFET acts as an emitter, the drain of MOSFET as a BJT collector. Parasitic BJT operates in the cut-off region.

image

Amazon Shopping

Welcome to Q&A site for electrical and electronics engineering discussion for diploma, B.E./B.Tech, M.E./M.Tech, & PhD study.
If you have a new question please ask in English.
If you want to help this community answer these questions.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase factor resistance load synchronous energy ac induction generator electric series frequency capacitor use speed between electrical meter line type mosfet control transmission difference magnetic plant high single instrument bjt source advantages function diode machine unit winding torque amplifier define supply thyristor motors arduino field shunt maximum relay armature problem electricity time parallel on transformers types coil diagram state flow value material three starting and direction theorem method emf operating digital microprocessor test instruments efficiency ratio loss measure operation connected low applications wave effect single-phase working losses different network wattmeter temperature measuring constant signal controlled breaker device full compare drive wire resistivity logic materials machines inductance switch flux disadvantages converter transistor gain protection scr angle force core measurement number free principle rc generators law negative bridge friction open circuits pole conductor conservation steam iron loop resistors hysteresis short computer using lines secondary station battery rectifier inverter linear relays nuclear regulation reactance design analog work rotor electronics gate forces diesel damping rlc connection factors capacitors minimum insulation basic moving running systems air fault range direct main stability quality starter igbt eddy ideal ammeter rl 3-phase plants arc induced thermal error fuzzy biasing dielectric pressure balanced superposition errors rotation characteristics feedback measured electronic start alternator off back curve over solar three-phase tariff locomotive peak bias zener capacitance commutator surge rating universal potentiometer permanent mechanical copper self transducer capacity electrons memory adc excitation inductive transfer explain fuse pure harmonics application inductor internal pmmc average reaction welding resonance traction breakers designed electromagnetic si generation brushes density switching shaded rate impedance distribution methods star oscillator reluctance semiconductor simplification algebra 8085 boolean weston dynamometer insulating strength installation permeability definition fuel heating earth units neutral rms rated engineering conductors coefficient controller usually reverse excited analysis change body components
...