Suggest a microcontroller for welding machine controller

[worksmart]

emi welding machine

Hello,


I have a project to design a welding machine controller based on a micro.
The micro should have good EMI immunity. It is preferrable if it has one inbuilt in 8bit DAC.

What is your openion about using Cypress PSoC.



Regards

WorkSmart

 

[bobcat1]

microcontroller machine controller

Hello

You can use the MSP430f169 or LPC2138 both have single and dual DAC chaneel

All the best


Bobi

 

[worksmart]

Thanks bobcat1.
What about EMI immunity.
Regards
WorkSmart

 

[bobcat1]

Hi

Most microcontroller have some sort of EMI emunity some type who designed for the CAR industry have better EMI but cost lot more See Freescale MAC7100 spec

From my point of view all you have to do is to design a better PCB by adding RF chockes on power reails lot of ground plan place the board in a grounded mettal box etc

All the best

Bobi

 

[muruga86]

most available micros have EMI interference problems, and defenately it would affect the performance of micros. it is the duty of hard ward and boarddesigner to protect he micros from EMI problems by better designing and employ better schielding techniques. if cost is not a problem search for a EMI hardened micros form harris semiconductiors https://www.harris.com which produce radiation hardened ics used for space applications.[/url]

 

[pixel]

PSoC is good solution if you are familiar with it.

 

[antedeluvian]

If I remember correctly, for the welding controller you will need:
some form of zero crossing detector (possibly a comparator), a ADC to measure the current, and a timer to measure the delay for the phase angle. The PSoC has all of this plus a lot more (as do many other processors) and is an excellent choice although you will need external circuitry as you would with any processor to interface with high voltages and switch current.

All processors are can be affected by noise depending on a number of factors and it is part of a designer's job to design the system to minimize the susceptibilty. You should concentrate on layout, decoupling, power supply and the proximity to lines carrying current especially if it is being switched. And you can add a watchdog and take care on writing the software for graceful recovery from failure.