Please Log in or Register for more.

Explain cycloconverter and its types.

463 views

1 Answer

Answer :

 
✔️✔️Best answer

Cycloconverter:

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.

image

  • 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.

 image

image


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.
Like 0 like

Please log in or register to answer this question.

Related Questions


three phase to single phase cycloconverter
Last Answer : three phase to single phase cycloconverter

Show More

514 views 1 answer







what is cycloconverter ?
Last Answer : Cycloconverter is a device which convert fixed AC input frequency to variable output frequency or variable input frequency to fixed output frequency.

Show More

83 views 1 answer







Explain three phase half wave controller or three phase unidirectional controller.
Last Answer : Three phase half wave controller or unidirectional controller:

Show More

239 views 1 answer







Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.
Last Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

Show More

719 views 1 answer







Explain three phase full wave controller.
Last Answer : Three phase full wave controller: Three phase full wave controller is also called as the three-phase bidirectional controller. Let the load is star connected so at each phase there are antiparallel connected SCRs. ... conduct at the same time and the third phase will be open.

Show More

266 views 1 answer







explain infusion and decoction process

Show More

13 views 0 answers







Explain MCB and ELCB with connection diagram supplying single phase load. 
Last Answer : OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

Show More

582 views 1 answer







Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties. 
Last Answer : Following are requirements of conductor:- i) High conductivity :  Material should have high conductivity, So that * cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... . Boiling point is 1820°C 9. Specific gravity is 2.7 10. High resistance to corrosion. 

Show More

214 views 1 answer







Explain with neat sketch the working principle of MIG.
Last Answer : In metal-arc inert gas welding the Weld area is shielded by an effectively inert atmosphere of argon, helium, carbon dioxide, or various other gas mixtures . The consumable bare Wire is fed automatically ... of the molten-weld puddle. Multiple-weld layers can be deposited at the joint. 

Show More

145 views 1 answer







Explain any four properties of Moulding sand. 
Last Answer : 1. Porosity: Molten metal always contain a certain amount of dissolved gases, which are evolved when the metal freezes the molten metal coming in contact with the moist sand , generates steam or ... to the casting. Refractoriness is measured by the sinter point of the sand rather than its melting

Show More

155 views 1 answer







List different starting methods of three phase synchronous motor. Explain any one of them.
Last Answer : Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor. 

Show More

158 views 1 answer







Draw and explain V and inverted V curves for synchronous motor.
Last Answer : V curves' and inverted V curves' for Synchronous Motor:  V curve:  V curve is a plot of the stator current versus field current for different constant loads. The graph is plotted ... Vcurves of synchronous motor. The highest point on each of these curves indicates unity power factor.

Show More

498 views 1 answer







Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.
Last Answer : Armature Reaction: The effect of armature flux on main flux is called as armature reaction.  Armature Reaction at Various Power Factors: When armature is loaded, the armature flux modifies ... lagging p.f. For capacitive loads the effect of flux is partly distorting and partly strengthening.

Show More

421 views 1 answer







Explain the activities carried out during weekly maintenance of 3 ph. Induction motor. 
Last Answer : Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor:  1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve ... and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.

Show More

163 views 1 answer







Explain construction and working of AC servomotor.
Last Answer : Construction of AC Servo Motor: AC servo motor is mainly composed of a stator and a rotor. Laminated stator core is usually made of silicon steel. Two phase windings are placed in the stator slots at 90 degree ... on rotor. Due to the force or torque acting on the rotor, it is set in motion. 

Show More

283 views 1 answer







Explain count up (CTU) instruction with timing diagram.
Last Answer : The CTU is an instruction that counts false-to-true rung transitions. Rung transitions can be caused by events occurring in the program. When rung conditions for a CTU instruction have made a false-to-true ... of Counter up(CTU) Instruction: Too many uploads - please try again in an hour

Show More

134 views 1 answer







Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin 
Last Answer : i) Special ward in hospital: For the patients in the wards, lighting should create a cozy and pleasant atmosphere. Lighting in the wards should be planned in such a way that it meets the specific ... we use such as cements and bonding agents that we use to restore your teeth back to health.

Show More

190 views 1 answer







Explain the working of Neon sign tube with diagram.
Last Answer : Neon sign tube: The construction & circuit diagram for neon tube is as shown in fig. Basically neon tube is used for advertisement or decoration purpose. The maximum length of tube is ... the HT transformer must be earthed separately. * Caution notice of danger board is required.

Show More

375 views 1 answer







Explain the working of HPMV Lamp with neat diagram.
Last Answer : High-pressure Mercury-Vapour Lamp (HPMVL):  Working:  * Whenever 1-ph, 230V, AC Supply is provided to the discharge tube of MVL, initially the current flows from Phase to the choke to ... : The function of power factor improvement capacitor is to improve the power factor from 0.5 to 0.95.

Show More

459 views 1 answer







Explain the features of Aquarium lighting. 
Last Answer : 1) The aquarium light depends upon the size of the aquarium tank (Length, width and depth)  2) The aquarium lighting depends upon the all surrounding condition e.g. colour and size of the given ... The aquarium lighting should be economical.  9) The life of the aquarium lighting should be long. 

Show More

215 views 1 answer







Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.
Last Answer : 1. A step down transformer 2. A rectifier 3. A filter 4. A regulator Operation of Regulated Power Supply:- Step Down Transformer:- A step down transformer will ... regulator. A regulator will maintain the output constant even when changes at the input or any other changes occur.

Show More

2.0k views 3 answers







What is PLL? Explain its operation with a block diagram.
Last Answer : PLL - A phase-locked loop or phase lock loop is a control system that generates an output signal whose phase is related to the phase of an input signal Block diagram  ... to the input frequency. The phase - locked loop goes through three states free running capture and phase lock.

Show More

268 views 1 answer







Draw & explain touch plate switch using IC555.
Last Answer : It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .

Show More

74 views 1 answer







Draw block diagram of PLL as a FM demodulator. Explain function of each block.
Last Answer : Operation:  The FM signal which is to be demodulated is applied at the input of the PLL.  the PLL is locked to the FM  The error voltage produced at ... using PLL ensures a high Linearity, between the instantaneous input frequency and VCO control voltage (error amplifier output)

Show More

312 views 1 answer







Draw & explain operation of phase detector.
Last Answer : In phase detector, the op-Amp basically acts as a zero crossing detector. If a sine wave is applied at the i/p, we get square wave at the op-Amp o/p (at point ... to two channel of the CRO. The time duration between the pulses corresponding to voltages represent the phase between them. 

Show More

127 views 1 answer







Explain dynamic and static induced emf with neat diagram.
Last Answer : Dynamically Induced EMF:-  In this case, either coil moves or magnet moves, so that there is relative motion between coil & magnetic field. Thus magnetic field is cut by coil & emf is induced in it. The emf ... The expression for induced EMF is e= -L(di/dt) or = -N(dϕ/dt).

Show More

593 views 1 answer







Explain the concept of lagging and leading phase angle by waveform.
Last Answer : i) Leading phase angle :  When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by  Φ.

Show More

378 views 1 answer













Draw and explain vacuum impregnation method of varnishing.

Show More

64 views 0 answers



















With neat diagram explain calibration of energy meter by direct loading method.
Last Answer : Calibration of Energy Meter by Direct Loading Method:  There are three methods for testing/calibration:  1. Long period dial test  2. Using rotary sub- standard meter  3. Using precision grade instruments  All ... of substandard meter in kWh  Then % error = [(D - DS)/DS] x 100

Show More

1.1k views 1 answer







List the different errors in wattmeter & explain compensation for it.
Last Answer : Errors in Wattmeter Compensation method Error due to connection method To overcome this error, wattmeters are provided with additional compensating winding which is connected in series with ... due to friction The weight of moving system be reduced to minimum possible.

Show More

7.0k views 1 answer







Draw symbol of LED and explain it’s working principle.
Last Answer : Construction of LED: The basic structure of LED is shown in fig.(a). The active region exists between the p and n regions. The light emerges from the active side in all the directions when electron hole-pairs ... fig.(c). In this way an LED emits light. This is the principle of operation of LED.

Show More

401 views 2 answers







Draw and explain RC phase shift Oscillator.
Last Answer : Circuit diagram of RC phase shift oscillator: WORKING: * Circuit consists of a single stage amplifier in common emitter configuration & RC phase shifting network. * R1, R2, RE provides biasing & CE ... . * The phase shift around the loop is 3600 only at one precise frequency.  

Show More

743 views 2 answers







What is photodiode? Draw the symbol and explain operation of photodiode. 
Last Answer : A photodiode is a light detector that converts light into an electrical current. A photodiode is a semi-conductor device, with a p-n junction and an intrinsic layer between p and n layers ... current is independent of reverse bias voltage. Reverse current is mostly depends on the light intensity.

Show More

579 views 1 answer







Classify magnetic materials and explain in brief.
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { ... the absence of external magnetic field. Following are the ferromagnetic materials: Iron, Cobalt, Nickel.

Show More

288 views 1 answer







A cycloconverter is a   (a) frequency change r(fc) from higher to lower frequency with one-stage conversion   (b) fe from higher to lower frequency with two-stage conversion   (c) fc from lower to higher frequency with one-stage conversion   (d) Either (a) or (c)
Last Answer : A cycloconverter is a   (a) frequency change r(fc) from higher to lower frequency with one-stage conversion   (b) fe from higher to lower frequency with two-stage conversion   (c) fc from lower to higher frequency with one-stage conversion   (d) Either (a) or (c)

Show More

802 views 1 answer







What is meant by negative converter group in a cycloconverter?
Last Answer : The part of the cycloconverter circuit that permits the flow of current during negative half cycle of output current is called negative converter group.

Show More

8 views 1 answer







What is meant by positive converter group in a cycloconverter?
Last Answer : The part of the cycloconverter circuit that permits the flow of current during positive half cycle of output current is called positive converter group.

Show More

9 views 1 answer







60 views 0 answers








Last Answer : Cycloconverter is a device which convert fixed AC input frequency to variable output frequency or variable input frequency to fixed output frequency. There are two types of cycloconverter 1. ... thyristors. Four thyristors are for positive converter and four thyristors are for negative converter.

Show More

82 views 1 answer







For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
Last Answer : Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.

Show More

192 views 1 answer







With neat sketch explain four modes of operation of a TRIAC? 
Last Answer : Modes of operation of a TRIAC: There are four different operating modes of TRIAC:  1) MT2 and gate are positive with respect to terminal MT1(Mode1) : Here terminal MT2 is positive ... junction P2-N2 is forward biased, current carriers are injected and therefore, the TRIAC is turned on. 

Show More

442 views 1 answer







Explain triggering of SCR using opto-coupler. State its advantages. 
Last Answer : Triggering of SCR using opto-coupler:  A simple opto-coupler based triggering circuit for SCR is shown in the figure. An optocoupler or opto-isolator is a combination of light source ... is small size and light weight device. iii)Interfacing with logic circuits is easily possible.

Show More

327 views 1 answer







Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.

Show More

537 views 1 answer







Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last Answer : Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on. 

Show More

220 views 1 answer







Explain working of static AC circuit breaker. 
Last Answer : Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

Show More

209 views 1 answer







With neat diagram explain synchronized UJT triggering circuit.
Last Answer : Line Synchronized UJT triggering circuit: The UJT is almost ideal as a firing device for SCRs. There are 2 main reasons for the compatibility between UJTs and SCRs. Firstly, the UJT produces a ... , the SCR is sure to have the right polarity between the anode and cathode for turning on.

Show More

567 views 1 answer







Explain working of AC circuit breaker using SCR with circuit diagram.
Last Answer : AC Circuit Breaker:  The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

Show More

937 views 1 answer






Show More⇦ PreviousNext ⇨