Rectifier is an electric device

A rectifier is an electrical device that transforms alternating current (AC), which flips course on a regular basis, to direct current (DC), which only travels in one direction. The inverter does the opposite process. The procedure is called rectification because it “straightens” the current course. Vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon-controlled rectifiers, and other silicon-based completely semiconductor switches are all examples of rectifiers. Even synchronous electromechanical switches and motors have been employed in the past.

Crystal radios employed a “cats whisker” of high-quality wire pressed against a galena (lead sulphide) crystal to operate a point-contact rectifier or “crystal detector.” Rectifiers have a wide range of applications, although they’re most commonly seen as parts of DC power supplies and high-voltage direct current power transmission systems. Rectification can be used for purposes other than generating direct current for use as a power source.

As previously stated, radio signal detectors are rectifiers. Flame rectification is used to identify the presence of a flame in gas heating systems. The output voltage may require additional smoothing depending on the type of alternating current delivered and the configuration of the rectifier circuit to provide a uniform, constant voltage.

Many rectifier applications, such as power supplies for radio, television, and computer equipment, necessitate a constant DC voltage (as could be produced through a battery). In those packages, the rectifier’s output is smoothed by a digital filter, which can be a capacitor, choke, or a collection of capacitors, chokes, and resistors, and is most likely accompanied by a voltage regulator to provide a steady voltage. An inverter is a more complex circuitry that performs the other function of turning DC to AC.

Classification of Rectifiers based on Control: 

Classification of Rectifiers based on Control:

Rectifier is the name for the circuit that converts AC to DC. Uncontrolled rectifier circuits are the most effective rectifier circuits that use diodes. All rectifiers are divided into three distinct categories.

 The simplest thyristors are used in the Controlled Rectifier. NO diodes are used. The thyristor and diodes are used in a half-controlled rectifier. Only diodes in an uncontrolled rectifier. Control the timing of when to start rectification and when to stop right here.

Phase Controlled Rectifiers: 

In contrast to a diode, an SCR no longer begins to conduct immediately after its voltage becomes positive. It must be triggered by a pulse on the gate. As a result, the thyristor may be made to conduct at any factor at 1/2 of a wave that applies positive voltage to its anode. As a result, the output voltage can be regulated.

Phase Controlled Rectifiers – Applications

Steel rolling generators, paper generators, and fabric turbines all require DC motor velocity control. Traction powered by electricity. DC transmissions at high voltages. Energy sources based on electromagnets.

Classification of Controlled Rectifiers:

  1. Single Phase Half Wave Controlled Rectifier with R Load. 
  2. Single Phase Half Wave Controlled Rectifier with RL Load. 
  3. Single Phase Half Wave Controlled Rectifier with RL Load and Freewheeling Diode. 
  4. Single Phase Full Wave Controlled Rectifier with R Load. 
  5. Single Phase Full Wave Controlled Rectifier with RL Load. 
  6. Single Phase Full Wave Controlled Rectifier with RL Load and Freewheeling Diode. 
  7. Single Phase Full Wave Half Controlled Rectifier (Semi Converter).
  8.  Three Phase Half Wave Controlled Rectifier. 
  9. Three Phase Full Wave Controlled Rectifier.

Classification of Controlled Rectifiers: 

They are categorised into two classes based on the period of conduction during each cycle of ac input voltage: (i) Half wave Rectifiers and (ii) Full wave Rectifiers.

 Complete wave Rectifiers are classified as (i) full wave Rectifiers with a centre tapped transformer and (ii) full wave Rectifiers with a bridge design.

 Converters are classified as (i) single phase Rectifiers (ii) three phase Rectifiers, according on the number of phases in the provide network.

Classification of Controlled Rectifiers:

Rectifiers are classed as (i) Single pulse Rectifiers (ii) Two pulse Rectifiers (iii) Three pulse Rectifiers (iv) Six pulse Rectifiers, etc., depending on the quantity of pulses at the dc aspect in a single length of the input ac voltage.

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