Golgappa.net | Golgappa.org | BagIndia.net | BodyIndia.Com | CabIndia.net | CarsBikes.net | CarsBikes.org | CashIndia.net | ConsumerIndia.net | CookingIndia.net | DataIndia.net | DealIndia.net | EmailIndia.net | FirstTablet.com | FirstTourist.com | ForsaleIndia.net | IndiaBody.Com | IndiaCab.net | IndiaCash.net | IndiaModel.net | KidForum.net | OfficeIndia.net | PaysIndia.com | RestaurantIndia.net | RestaurantsIndia.net | SaleForum.net | SellForum.net | SoldIndia.com | StarIndia.net | TomatoCab.com | TomatoCabs.com | TownIndia.com
Interested to Buy Any Domain ? << Click Here >> for more details...

i am swathi, b.tech 4th year.
In smps(switched mode power supply)we are using
diodes,mosfets,igbts for controling of current.
And my question is why we did not use thyristors(scr)? it
is also act as a switch,then what is the drawback of scr as
compared to above transisters> if we use the scr,then what
is happening ? plz give reply as soon as possible bcoz i
am doing project on smps. plz frnds i want ans for
that. if anybody know the ans plz send to my e-mail
id /swathi.tadakapally@gmail.com/

Answer Posted / prasad,clp(power)

Hi dear this is prasad from clp (power)...we can use
thyristor(scr) but for scr we have to design firing angle
circuit separatly,we have to check whether scr is
triggering or turning on exatctly as per our requirements
or not and for high power applications it is better to
diodes,mosfet,igbts..in these we wont face firing angle
circuit design problems...bocz for the SCR firing circuit
is the heart hope so....

Is This Answer Correct ?    10 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Convert a star connected network into a delta connected network.

1170


how the works electronic energy meter?

2220


salam,hi, i need to know what the spesification of 300amp msb...

2080


what is the necessary of using inductance property in transmission lines even through resistance is used to opposes the high current flows in that?????

1944


What is K-rated transformer? What is the use of it? What can be the size(pls provide calculation if possible) of K- factor transformer for 550kW,690V motor operating with drive (VFD)?

2327


1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

2113


mention hazard experienced during installation

2024


How may I enrol or get admission to your program?

1960


What are the advantages of a three-phase system over a single-phase system?

1170


What is “pu” in ee?

1127


Z transform is use when system is not a) converges b) diverges

1734


we use capister for power factor. when we use capaciter in dg circuit  than defect dg. can we use capaciter bank for dg circuit

1982


True or false question. 1.The fuse provide phase and neutral 2.power loss in electrical circuit can take place in (resistance or inductance or capacitance). 3.two phase system each phase has separated by a phase difference of (90 or 180 or 270 or 45). 4.3 phase balanced star connected load neutral current shall be (line current or phase current or zero or unity)

1658


Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?

2003


how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization)

2427