how to limit inrush current?

[niks]

limit inrush current

Hi,
How to limit inrush current in battery operated device? Im looking for small and low power consuming circuit.
~niks~

 

[Al Farouk]

simple inrush current limiter

see the following link
http://www.ibselectronics.com/ibs/cmpnts/ametherm/inrush_current_faq.html

 

[Eternauta]

fet inrush current limit -patent

Give a look at this application fom Motorola:
**broken link removed**
"Active Inrush Current Limiting Using MOSFETs "

 

[neerajs]

p-fet inrush current limiting

You can also have a look atTC (Negative Temperature Coefficient)thermistors..

This site has good articles.

https://www.ametherm.com/Inrush_Current/welcome.html
https://www.ametherm.com/Inrush_Current/inrush_current_faq.html

 

[niks]

active inrush current limiter

Hi ,
This is a simple ckt to limit inrush current. But im not very sure wats the purpose of the diode used? can anyone explain me
niks

 

[Borber]

When switch SW1 is opened C1 should discharge quickly to prepare inrush circuit for new start. For that purpos serves diode D1. It bypasses resistor R2 for discharge current of C1. Discharge current flows through R1, load and D1.

 

[arcaphill]

Use bead in your power line!

 

[onejames]

What about the below idea?
That is, it is for the gate voltage to be fallen slowy(in P-FET) by using some large capacitor to the gate pin. Can this method be harmful to the FET with respect to the Electrical Stress ?