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Robert L. Chao

MOSFETs Balance Supercapacitors with Zero Power Burn

Robert L. Chao
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Anders122
Anders122
9/29/2016 4:40:50 PM
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Newbie
Interesting article.

Best Regards, Anders

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sroochi
sroochi
4/28/2016 5:27:26 PM
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Newbie
ASIC to do same
Instead of a specially specified MOSFET or resistor, one actually needs an application speciic integrated circuit -- an ASIC.  This device can take into account the number of supercaps in series, the maximum voltages acceptable for each supercap, the terminal voltage --whether it is 4.7V, or 30V or even more.  It can be designed in any number of "obsolete" IC technologyies to take advantage of low mask costs, wafer costs, etc.  Please post any other requirements you may have.  

Sam Ochi

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Bigjeff
Bigjeff
4/27/2016 2:36:44 PM
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Newbie
Need more component
Hi,

 You need to add one series resistance per mosfet for two reason:

1- with temperature variation, the mosfet gate level can change so a high current could be there all the time and since there no series limiting resistance, you will short V+ to GND.

2- If one of the super cap voltage level go down with age, the mosfet of the other cap will come on all the time.

 

Louis Geoffroy

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