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भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन

भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन विज्ञान भारती उदयपुर इकाई एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में कार्यक्रम सम्पन्न उदयपुर, 2 अगस्त। भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती के अवसर पर विज्ञान भारती उदयपुर इकाई (चित्तौड़ प्रांत) एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में एक विशेष व्याख्यान का आयोजन किया गया। कार्यक्रम का उद्देश्य आचार्य पी.सी. रे के वैज्ञानिक योगदान एवं उनके देशभक्ति से ओतप्रोत जीवन पर प्रकाश डालना था। ज्ञातव्य है कि भारत की पहली फार्मा कंपनी आचार्य रे ने ही बंगाल केमिकल एंड फार्मास्यूटिकल्स लिमिटेड, कोलकाता में 1901 में प्रारंभ की थी। कार्यक्रम में विज्ञान भारती के उद्देश्य एवं गतिविधियों की जानकारी डॉ. अमित गुप्ता द्वारा दी गई। आचार्य पी.सी. रे के जीवन और कार्यों पर मुख्य व्याख्यान डॉ. लोकेश अग्रवाल द्वारा प्रस्तुत किया गया। उन्होंने बताया कि कैसे आचार्य रे ने विज्ञान को समाज की सेवा का माध्यम बनाया और रसायन विज्ञान में भारत को आत्मनिर्भर बनान...
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Types of power diodes | Power electronics

Types of Power Diodes

  • The power diodes are mainly classified into following three categories:

General purpose diode

  • The value of trr for these diodes are vey high, and it is about 25µs.
  • The current rating for general purpose diode is from 1A to several thousand amperes.
  • The voltage rating of general purpose diodes are from 50V to 5kV.

Uses

  • The general purpose diodes are used in battery charger.
  • These diodes are also used in electric traction.
  • The general purpose diodes are also used in electroplating.
  • In welding works, the general purpose diodes are very useful.
  • These diodes are used in uninterruptible power supply (UPS) too.

Fast recovery diode

  • The value of trr of fast recovery diode is low and it about 5µs or less.
  • Its current rating is from 1A to several thousand amperes.
  • The voltage rating of fast recovery diodes are from 50V to 3kV.
  • If we require the voltage rating of fast recovery diode below 400V, then the epitaxial process is used for diode fabrication and for such diode trr ≈ 50ns.
  • And for voltage rating of fast recovery diode above 400V, the diffusion process is used for diode fabrication.

Uses

  • The fast recovery didoes are used in choppers.
  • The fast recovery diodes are also used in communication circuits.
  • The switched mode power supplies (SMPS) also uses fast recovery diodes.
  • The fast recovery diodes are used in induction heating also.

Schottky diode

  • In schottky diodes metal-to-semiconductor junction is used for rectification purpose instead of pn-junction.
  • The schottky diodes have very fast recovery time and low forward voltage drop.
  • The reverse voltage rating of schottky diodes is about 100V.
  • Also the forward current rating of schottky diodes are from 1A to 300A.

Uses

  • The schottky diodes are used in high frequency instrumentation.
  • These diodes are also used in switching power supplies.
To know about this lecture in more detail please visit on https://youtu.be/BD8wa_o_31U
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