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Chopper circuit which is a static power electronics device is used to covnert

Chopper circuit which is a static power electronics device is used to covnert Correct Answer DC to DC

A chopper is a static device which is used to obtain a variable dc voltage from a constant dc voltage source. Also known as a dc-to-dc converter.

They can step up the DC voltage or step down the DC voltage levels.

Types of Choppers:

  • Type A Chopper or First-Quadrant Chopper
  • Type B Chopper or Second-Quadrant Chopper
  • Type C Chopper or Two-quadrant type-A Chopper
  • Type D Chopper or Two-quadrant type-B Chopper
  • Type E Chopper or fourth-quadrant Chopper

 

Note:

Power electronic circuits can be classified as follows.

1. Diode rectifiers:

  • A diode rectifier circuit converts AC input voltage into a fixed DC voltage.
  • The input voltage may be single phase or three phase.
  • They find use in electric traction, battery charging, electroplating, electrochemical processing, power supplies, welding and UPS systems.

 

2. AC to DC converters (Phase controlled rectifiers):

  • These convert AC voltage to variable DC output voltage.
  • They may be fed from single phase or three phase.
  • These are used in dc drives, metallurgical and chemical industries, excitation systems for synchronous machines.

 

3. DC to DC converters (DC Choppers):

  • A dc chopper converts DC input voltage to a controllable DC output voltage.
  • For lower power circuits, thyristors are replaced by power transistors.
  • Choppers find wide applications in dc drives, subway cars, trolley trucks, battery driven vehicles, etc.

 

4. DC to AC converters (Inverters):

  • An inverter converts fixed DC voltage to a variable AC voltage. The output may be a variable voltage and variable frequency.
  • In inverter circuits, we would like the inverter output to be sinusoidal with magnitude and frequency controllable. In order to produce a sinusoidal output voltage waveform at a desired frequency, a sinusoidal control signal at the desired frequency is compared with a triangular waveform.
  • These find wide use in induction motor and synchronous motor drives, induction heating, UPS, HVDC transmission etc.

 

5. AC to AC converters: These convert fixed AC input voltage into variable AC output voltage. These are two types as given below.

i. AC voltage controllers:

  • These converter circuits convert fixed AC voltage directly to a variable AC voltage at the same frequency.
  • These are widely used for lighting control, speed control of fans, pumps, etc.

 

ii. Cycloconverters:

  • These circuits convert input power at one frequency to output power at a different frequency through a one stage conversion.
  • These are primarily used for slow speed large ac drives like rotary kiln etc.

 

6. Static switches:

  • The power semiconductor devices can operate as static switches or contactors.
  • Depending upon the input supply, the static switches are called ac static switches or dc static switches.

Related Questions

In a company there are 252 engineers, in which the ratio of the number of electronics engineers and computer engineers is 2 ∶ 1. The ratio of the number of electronics engineers and computer engineers becomes 1 ∶ 1 after recruitment of some more computer engineers. The average age of all the engineers is now 22 years and the average age of the computer engineers is 2 years less than the average age of electronics engineers. (A) The average age (in years) of electronics engineers is 21 (B) The average age (in years) of computer engineers is 21 (C) The average age (in years) of electronics engineers is 23 (D) The average age (in years) of electronics engineers is 25 (E) The average age (in years) of computer engineers is 23 Choose the correct answer from the options given below: 
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