Diwadiya na Avalanche

Takaitaccen Avalanche Diode

Avalanche diode ita ce wata mafi girman diodin semiconductors da aka haɗa da shi don samun avalanche breakdown a zama kashi na reverse bias. Pn junction ta avalanche diode ya haɗa da shi don bincike masu karfi a kan current da ke yi hot spots cewa diode ba za su da dacewa game da avalanche breakdown.

Avalanche breakdown da yake faru suna ne saboda minority carriers da suka haɗa da shi zuwa ionization a crystal lattice, tana ci gaba masu karfi da suke yi ionization. Saboda avalanche breakdown ana faru a duk junction, breakdown voltage yana kasance maƙaranta a nan da current ya faru wasu da non-avalanche diode.

Hanyoyin avalanche diode ita ce mai Zener diode, kuma Zener breakdown da avalanche breakdown suna cikin wannan diododin. Avalanche diodes suna haɗa da shi don avalanche breakdown conditions, saboda haka suna nuna voltage drop mai yawa a nan da breakdown conditions, babu Zener diodes da ke yi voltage mai yawa game da breakdown.

Wani abubuwan da take bayyana ita ce surge protection mai kyau da Zener diode mai tsawo, kuma take yi nasara a gas discharge tube replacement. Avalanche diodes suna da small positive temperature coefficient of voltage, inda diodes da ke yi Zener effect suna da negative temperature coefficient.

Diode na biyu yana iya lashe electric current a fadin da za a iya (forward direction). Amma, avalanche diode yana iya lashe current a fadon da za a iya da fadon da ba za a iya (reverse direction) amma an haɗa shi don yi a fadon da ba za a iya.

Siffar Tattalin Aiki

Avalanche diode take tatta aiki da siffar avalanche breakdown, inda charge carriers da suka haɗa da shi suka sami energy da ke yi ionize other atoms, tana ci gaba chain reaction da ya ci gaba masu karfi da suke yi current flow.

Reverse Bias Configuration

A fadon da ba za a iya, N-region (cathode) ta diode ya haɗa da terminal na positive ta battery, da P-region (anode) ta haɗa da terminal na negative.

Idan diode ya haɗa da impurities concentration mai yawa, width ta depletion region tana ci gaba, saboda haka breakdown voltage tana faru a nan da voltage mai yawa.

A fadon da ba za a iya da voltage mai yawa, electric field tana ci gaba a depletion region, tana ci gaba point da acceleration ta minority carrier tana ci gaba da shi, idan suka haɗa da semiconductor atoms a depletion region, suke buƙata covalent bonds.

Wannan yanayin tana ci gaba electron-hole pairs da suka haɗa da shi da electric field, tana ci gaba more collisions da kuma ci gaba number ta charge carriers—phenomenon da aka sani da carrier multiplication.

Wannan yanayin da ya ci gaba tana ci gaba reverse current a diode, saboda haka diode tana ci gaba breakdown condition. Wani abubuwan da take bayyana ita ce avalanche (flood) breakdown da wannan yanayin tana sani da avalanche effect.

Applications

• Avalanche diode tana amfani a cikin protection of the circuit. Idan reverse bias voltage tana ci gaba, tana ci gaba limit diode tana faru avalanche effect a particular voltage da kuma diode tana breakdown because of avalanche effect.

• Tana amfani don protection of the circuit against unwanted voltages.

• Tana amfani a cikin surge protectors don protection of the circuit from surge voltage.