Dear Forummembers,

I discover this board and was wondered about the technical knowledge included in all the threads. Therefore i plan to write my question here.

I have a few questions where i want some feedback on, to push me in the right direction to find a good solution.

We have a battery supply that supplies every piece in our box. This box have inputs and outputs. The inputswill used for read a sensor and the outputs to drive a motor. This is in short description.

Now my question is, what for diagnostics and protection circuits i have to forseen to work very save in my battery supply part. I give an example:

• Overcurrent protection
• Overvoltage protection
• Undervoltage diagnostics
• Over temperature diagnostics
• Reverse polarity protection

If you know other protection or diagnostics issue, please write it down.

I'am also looking for relevant protection and diagnostics issue for following cases:

Analog input, to read a PTC
Digital input, to read speed sensor
Digital output, to drive motor with PWM

If someone know what i reallly have to forseen on these in-and outputs, please let me know.
It would be also very helpfull to give me some technical solutions to solve the reqiurements. I know this is general question, but i don't exêct to give me a detailed solution, onlu to put me in the right direction.

Thank you,
Jef

 

Hello,

Here is some information on battery monitoring and overvoltage protection.
http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html
http://www.maxim-ic.com/appnotes.cfm?an_pk=760

Greetings,
Bertus

 

Thank you for the information, the two articels were very helpfull.

Now i'am also looking for possible protection and diagnostics for a digital input and anlog input, analog output and digital output.
Any information is welcome.

Greetings,
Jef

 

Hello,

Do you mean protection from Electrostatic Discharges?
Here is a page of the EDUCYPEDIA on ESD.
http://www.educypedia.be/electronics/esd.htm

There is also an page on VDR's and SIOV's over there.
http://www.educypedia.be/electronics/resistorsnon.htm

Greetings,
Bertus

 

No not really. So when you have lot of inputs and outputs you have to think about a few things. One thing is that it is working in a save way.

For example: When i have a digital input on my µC.
I have to consider that a few problems arise, spikes on the input (integrate filter), short to ground (protection circuit) etc.....

Now i want to have a summary what can happen if you have an analog in-and output, digital in-and output.
What for actions do i have to take to minimize the problems.

Greetings,
Jef

 

Is there nobody with an idea on that issue.

It is difficult to find that on the internet because it's a very general question.

For the digital input i also add a noise filter. all other ideas are very welcome.

Thank you,
Jef