Working of Diode rectifiers (Uncontrolled rectifiers)

Introduction

Circuits that are used to convert the Alternating Current (AC) input power into a Direct Current (DC) output power is known as rectifier circuits. Rectifiers are found in almost all equipment, from a low voltage battery charger to High Voltage DC transmission systems. Basically, rectifiers are classified into Controlled rectifiers and uncontrolled rectifiers. In controlled rectifiers, semiconductor switches such as thyristors, BJTs, MOSFETs, IGBT etc are used. The output parameters of a controlled rectifier can be easily controlled with the help of semiconductor switches. In this article only the uncontrolled rectifiers are discussed. As the name indicates these rectifiers cannot be controlled externally. Controlled rectifiers are made up of a few diodes and conditioning elements such as capacitors.

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What is Buchholz relay? Why is it used?

What is Buchholz relay?

Buchholz relays are generally used to sense abnormal conditions occurring inside a transformer. It is a type of oil and gas actuated protection relay. It can be seen in all oil immersed transformers having a rating more than 500 kVA. In order to reduce the manufacturing cost, Buchholz relays are not provided in transformers having a rating below 500 kVA.

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Comparision of conventional energy resources

Conventional energy is obtained from the conventional energy resources such as coal, diesel, gas and nucleus. These are non-renewable resources and may exhaust in few decades if consumed at the current rate. The burning of fossil fuels produces harmful gases such as nitrous oxide, carbon monoxide, sulphur-di-oxide etc and pollutes the environment. The comparison of various factors of power production from the conventional resources is listed below. (more…)

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How does a LCD work?

LCDs are not new to us since we always use devices made up of Liquid Crystal Displays (LCDs) like computers, digital watches and also DVD and CD players. The invention of LCD was has changed the world of electronics from bigger CRTs to portable tablets.

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Metal halide (MH) lamp

Metal halide (MH) lamp provides high efficiency, long service life and excellent colour rendition. It consists of an arc tube enclosed in a glass chamber made up of borosilicate glass. Arc tube is also called as discharge tube or “burner”. The arc tube consists of argon gas, mercury and metal salts such as sodium iodide.  They operate at higher temperatures and pressures.

Ballast is used to supply a high starting voltage. The ballast also regulates the lamp starting current and lamp operating current. (more…)

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How refrigerators work?


Modern fridges are available in various sizes with different features incorporated by the manufacturers. Apart from these features the basic principle of refrigeration of course remains the same. The method of deployment hasn’t changed much since from the aforementioned Frigidaire unit in 1923.

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What is inductance?

  It is a property of a circuit element called inductor to store energy in the magnetic field when current passes through it. A basic inductor can be made by…

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What is voltage?

There are two types of charges namely positive charge and negative charge. As we all know these charges are opposite and they attract . A work is done to separate…

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What is resistance?

  Resistance is the property of a material to oppose the flow of electrons through it (current). When electrons flow through a material, they collide with the other atoms in…

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How do Fuel Cells Work?

Fuel Cell
Fuel Cell

Fuel cells cleanly and efficiently convert chemical energy from hydrogen-rich fuels into electrical power and usable high-quality heat in an electrochemical process that is virtually absent of pollutants. (more…)

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