Welcome to electrical and electronics engineering Q&A site...

Welcome to electrical and electronics engineering discussion website, Please login or register to continue.

Join our WhatsApp group

Subscribe To Our YouTube Channel

in Unit 6 by
Explain cycloconverter and its types.

Amazon Shopping

Please log in or register to answer this question.

1 Answer

0 votes
Best answer


Cycloconverter is an AC to AC converter which converts input AC into variable AC. It changes frequency. Basically, there are two types of cycloconverter one is step up cycloconverter and second is step down cycloconverter. Step up cycloconverter converts lower input AC frequency to higher output AC frequency. Step down cycloconverter converts higher input AC frequency to lower output AC frequency. Cycloconverter is useful for both variable and fixed output frequency means cycloconverter is useful for changing fixed input frequency to variable output frequency and it is also useful for changing variable input frequency to fixed output frequency. In cycloconverter, there is no need for DC link. Cycloconverter inherently have voltage control feature. Cycloconverter is a one stage conversion device. Cycloconver is a one stage frequency changer. Cycloconverter is used for any power factor. Cycloconverter allows power flow in any direction.

Types of cycloconverter:

  • Step up cycloconverter:

In step-up cycloconverter lower input AC frequency is converted to higher output AC frequency. Step up cycloconverter requires forced commutation.

  • Step down cycloconverter:

In step down cycloconverter higher input frequency is converted to lower output frequency.

Single phase to single phase cycloconverter:

Midpoint cycloconverter and bridge type cycloconverter are the two configurations.


  • Mid-point configuration:
  • In mid-point type cycloconverter there is one single phase transformer whose secondary winding is mid-tap. And it consists of four thyristors as shown in the figure. The four thyristors are connected in two single phase fully controlled bridge configuration connected in opposite direction.
  • Bridge configuration:
  • There are two groups of converters in bridge converter one is positive group converter and second is negative group converter. Each group has four thyristors. These bridge groups are fully controlled and the input to them is single phase AC. The two bridge should conduct alternately otherwise shortcircuit will produce at the input. P-converter is for the positive half cycle and N-converter is for the negative half cycle.

Three phase to single phase cycloconverter:

The figure shows three phase to single phase cycloconverter.



Three phase to three phase cycloconverter:

The figure shows three phase to three phase cycloconverter.

Applications of cycloconverter:

  • Cycloconverter is used for induction heating.
  • SVC (static VAR compensator).
  • Wind generator.
  • AC motor speed control.
  • Electric traction application.

Advantages of cycloconverter:
  • Cycloconverter can be used for both fixed and variable frequency output.
  • Cycloconverter can be used with any power factor.
  • Useful for large power drives.

Disadvantages of cycloconverter:
  • So many thyristors are required in cycloconverter.

Amazon Shopping

Welcome to Q&A site for electrical and electronics engineering discussion for diploma, B.E./B.Tech, M.E./M.Tech, & PhD study.
If you have a new question please ask in English.
If you want to help this community answer these questions.


Most popular tags

power motor dc circuit transformer voltage current used system phase factor resistance load synchronous energy ac induction generator electric series frequency capacitor use speed between electrical meter line type mosfet control transmission difference magnetic plant high single instrument bjt source advantages function diode machine unit winding torque amplifier define supply thyristor motors arduino field shunt maximum relay armature problem electricity time parallel on transformers types coil diagram state flow value material three starting and direction theorem method emf operating digital microprocessor test instruments efficiency ratio loss measure operation connected low applications wave effect single-phase working losses different network wattmeter temperature measuring constant signal controlled breaker device full compare drive wire resistivity logic materials machines inductance switch flux disadvantages converter transistor gain protection scr angle force core measurement number free principle rc generators law negative bridge friction open pole conductor conservation steam iron loop resistors hysteresis short computer circuits using lines secondary station battery rectifier inverter linear relays nuclear regulation reactance design analog work rotor electronics gate forces diesel damping rlc connection factors capacitors minimum insulation basic moving running systems air fault range direct main stability quality starter igbt eddy ideal ammeter rl 3-phase plants arc induced thermal error fuzzy biasing dielectric pressure balanced superposition errors rotation characteristics feedback measured electronic start alternator off back curve over solar three-phase tariff locomotive peak bias zener capacitance commutator surge rating universal potentiometer permanent mechanical copper self transducer capacity electrons memory adc excitation inductive transfer explain fuse pure harmonics application inductor internal pmmc average reaction welding resonance traction breakers designed electromagnetic si generation brushes density switching shaded rate impedance distribution methods star oscillator reluctance semiconductor simplification algebra 8085 boolean weston dynamometer insulating strength installation permeability definition fuel heating earth units neutral rms rated engineering conductors coefficient controller usually reverse excited analysis change body components