Misalai su Power Diodes?

Mai suna Power Diodes?

Power Diode

A power diode ita ce diode da ake amfani da shi a cikin hanyoyin kula na elektronika, wanda yake iya taimaka da kurfi mai tsawon da ke da sabbin diodes. Yana da biyar matsayin kuma yana taimakawa da kurfi a wurin daga gaba, da kayan aiki da ake gina don aiki masu tsawo mai yawa.

Don in fahimta power diodes da kyau, bana da zan iya duba hakan ya yi a diode na gargajiya. A diode ita ce babban kayan aiki na semiconductor, da biyar matsayin, da biyu matsayin, da kuma wahid junction.

Diodes na iska suna da junction da ake gina tare da p type na semiconductor da n type na semiconductor. Matsayin da ake gina tare da p-type an sanya shi a anoda, kuma matsayin da ake gina tare da n-type an sanya shi a katoda.

Rasa na biyu yana nuna kaya na diode na iska da kuma alamar shi.

Power diodes suna da nasararrin da ke da diodes na iska, amma suna da wannan nasararrin a kan kayan aikinsu.

A diodes na iska (kuma ake sani "signal diode"), daraja na doping ta P da N suka daɗe, kuma saboda haka muna samun PN junction, amma a power diodes, muna samun junction da ake gina tare da P mai doping mai yawa da N+ mai doping mai ci – layer wanda ake gina tare da N mai doping mai yawa. Saboda haka, kayan aiki yana nuna kamar hakan a rasa na biyu.+

Layer N– ita ce muhimmin nasarar power diode wanda ke taimaka shi don aiki masu tsawo mai yawa. Wannan layer yana da doping mai ci, kamar yadda ake gina tare da intrinsic, kuma saboda haka, ake kira shi PIN diode, inda i tana nufin intrinsic.

Kamar yadda ake gina tare a rasa na uku, net charge neutrality na space charge region ana iya ba da shi kamar yadda ke da shi a signal diode, amma girman space charge region yana da tsawon da ke da shi da kuma ya gama a nan N– region.

Wannan shine saboda doping concentration mai ci, kamar yadda ake gina tare da girman space charge region yana da tsawon da ke da shi tare da haske da doping concentration.

Girman tsawon da ke da depletion region ko space charge region yana taimaka diode don kula tsawon da ke da reverse-biased voltage mai yawa kuma tana da breakdown voltage mai yawa.

Amma, addin N– layer yana da tsawon da ke da ohmic resistance na diode tare da karshen heat generation a lokacin forwarding conduction state. Saboda haka, power diodes suna da fannon da take iya amfani da shi don kula heat dissipation daidai.

Muhammadu na N- Layer

N- layer a power diodes yana da doping mai ci, kuma yana da tsawon da ke da space charge region thickness da kuma taimakawa don reverse-biased voltages mai yawa.

V-I Characteristics

Rasa na biyu yana nuna v-i characteristics na power diode wanda yana da nasararrin da ke da signal diode.

A signal diodes don forward, biased region current yana da tsawon da ke da exponential, amma a power diodes high forward current yana da tsawon da ke da high ohmic drop wanda yana da tsawon da ke da exponential growth da kuma curve yana da tsawon da ke da linear.

Maximum reverse voltage da diode yake iya kula shine VRRM, i.e. peak reverse repetitive voltage.

Daga nan zuwa rarrabe, reverse current yana da tsawon da ke da high abruptly, kuma saboda diode ba a yi aiki don kula heat da ke da shi, za a iya hada shi. Wannan voltage zai iya kira peak inverse voltage (PIV).

Reverse Recovery Time

Rasa na biyu yana nuna reverse recovery characteristic na power diode. Lokacin da diode yana da switch off, current yana da tsawon da ke da IF to zero and further continues in reverse direction owing to the charges stored in the space charge region and the semiconductor region.

This reverse current attains a peak IRR and again starts approaching zero value and finally, the diode is off after time trr.

This time is defined as reverse recovery time and is defined as the time between the instant forward current reaches zero and the instant the reverse current decays to 25% of IRR. After this time the diode is said to attain its reverse blocking capability.

Softness Factor

The softness factor of power diodes is the ratio of charge removal times from the semiconductor and depletion regions, indicating voltage transients upon turn-off.