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महाराणा प्रताप ट्रेल सज्जनगढ़ उदयपुर

महाराणा प्रताप ट्रेल सज्जनगढ़ उदयपुर में इको ट्रेल 30 नवम्बर को राजस्थान वन विभाग उदयपुर डिविजन तथा WWF-India उदयपुर डिविजन के सानिध्य में महाराणा प्रताप ट्रेल सज्जनगढ़ उदयपुर में इको ट्रेल की गई, जिसमें WWF-India के स्टेट काॅर्डिनेटर श्रीमान अरूण सोनी तथा वन विभाग कीे ओर से डाॅ. सतीश कुमार शर्मा, सेवानिवृत्त अधिकारी मौजूद थे। मुझे भी इस इको ट्रेल में जाने का सुअवसर प्राप्त हुआ, जो गोरीला व्यू पाॅइंट से बड़ी-लेक व्यू पाॅइंट तक की गई इसमें मुझे विज्ञान की एक नई शाखा के बारे में पता चला, जिसे टट्टी विज्ञान कहा जाता है। सुनने में आपको थोड़ा अजीब लगेगा, मुझे भी सुनकर हैरानी हुई, परन्तु वास्तव में एक ऐसा भी विज्ञान है, जिसके बारे में डाॅ. सतीश शर्मा ने बड़े ही विस्तार पूर्वक बताया कि किस प्रकार वनों में जानवरों की टट्टी देखकर यह पता लगाया जा सकता है कि यहां कौनसा जानवर आया था। जानवरों की टट्टी कितनी पुरानी है, वह गीली है या सूखी है। इसी के आधार पर उस विशेष जंगल में कौन-कौनसे जानवर विचरण करते हैं, उसके बारे में वन विज्ञान के कर्मचारी पता लगा लेते हैं। जानवरों की टट्टी का विश्लेषण करके यह पता लगा...
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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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