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खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता विषय पर विशेषज्ञों का मंथन

खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता  विषय पर विशेषज्ञों का मंथन पर्यावरणीय स्थिरता मानव समाज के निरन्तर अस्तित्व, समृद्धि और स्वास्थ्य के लिए मूलभूत शर्त है। हमारी न्यू जनरेशन को स्पीड और टेक्नोलॉजी पर ध्यान केंद्रित करना होगा ताकि भविष्य को सुनहरा बनाया जा सके। उक्त विचार मुख्य अतिथि श्री एमपी सिंह, प्रधान मुख्य अभियंता, केंद्रीय विद्युत प्राधिकरण विद्युत मंत्रालय भारत सरकार, नई दिल्ली ने व्यक्त किए श्री सिंह भूपाल नोबल्स स्नातकोत्तर महाविद्यालय में भूविज्ञान विभाग द्वारा "खनन और खनिज उद्योगों में पर्यावरणीय स्थिरता" विषय पर आयोजित दो दिवसीय राष्ट्रीय कॉन्फ्रेंस के समापन पर बोल रहे थे। दो दिवसीय राष्ट्रीय कान्फ्रेंस का भव्य समापन सम्मानित अतिथि प्रो विनोद अग्रवाल सदस्य, भारत सरकार नई दिल्ली स्थित MOEFCC की विशेषज्ञ मूल्यांकन समिति, (सि एण्ड टीपी) अपने उद्बोधन में कहा कि पर्यावरण स्थिरता सरकार और समाज दोनों की जिम्मेदारी है। वर्तमान में खनन उद्योग विभिन्न प्रावधानों एवं कानूनों के तहत कार्य कर रहा है ताकि पर्यावरण को सुरक्षित रखा जा सके। आयोजन सचिव डॉ. हेमंत सेन न...
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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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