[SOLVED] Need help in designing switching/chopping circuit

[j37prakash]

I am in need of designing and constructing a switching / chopping circuit to switch a power supply of around 100V dc at the rate of about 250Hz and the Load is a purely Inductive load. The load is nothing but a buzzing coil to switch on and off reed switches at 250Hz frequency. The current through the coil will be around 3A. It currently runs on an old bulky transformer but the system must be replaced with a solid-state controller. Kindly suggest me if I should deploy SCRs, MOSFETs, or any other device. Please provide me your valuable suggestions and ideas or send me links to any such solutions or references. Thanks a lot in advance for your kind help.:roll:

 

[atripathi]

You can use MOSFET.For SCRs you need to worry about turn off circuit and they also require higher power from gate drive circuit in comparison to MOSFet.

 

[j37prakash]

You can use MOSFET.For SCRs you need to worry about turn off circuit and they also require higher power from gate drive circuit in comparison to MOSFet.

Thank you Atripathi for explaining me the disadvantages of using a SCR for my circuit so nicely. Can you suggest me or recommend me to any particular MOSFET, as I have never used a MOSFET till now. I'm sorry for my ignorance. Is there any comparable circuit or useful link for easing out my task ?

 

[atripathi]

you can select MOSFET from any semiconductor web site . International Rectifier Home Page - Flash Detection, Fairchild Semiconductor | Power Management & Mobile IP Solutions are couple of example.