[SOLVED] DC chopper versus Buck converter

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sribalaji

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Hi..This is my first post in this forum..
I'm supposed to convert 150-350vdc into a constant 110vdc for a certain application. The important criteria is to minimize the size of the circuit. So instead of using a buck converter which usually involves a bulky inductor may i go for a simple DC chopper circuit? For what applications we normally go for smps? I must design this converter to drive a solenoid.
Solenoid specification: 110vdc;
4A


Thanks..
 

For an output power capability up to 500W (110V/4A) you may need to use half bridge converter / full bridge topology.
 

If you want to make a regulated voltage, then you will need either a SMPS (which will always involve an inductor or transformer) or a linear regulator (which will be inefficient). A chopper should work okay so long as the solenoid can tolerate the high peak voltages involved, and you keep ripple current low. You would need to have some feedback or feedforward to change duty cycle based on input voltage, though.
 
A DC chopperi seffectively operating a s a buck converter, in so far there's no difference between both. If you mean to feed the chopped voltage to the solenoid directly, you'll use the solenoid as converter inductor. As said, you have to check the volatge rating, and select the chopper frequency for reasonable current ripple.
 
Thank you all for the help provided...
 

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