capacitor

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EfeVural

New Member

• Jan 24, 2011

• #1

In the attached file i charge a capacitor when voltage is applied and decharge when 0V is applied by the help of an and gate(for simulation). What i want to do is capacitor will charge the same way ; but when 0 volts come i do not want its voltage to drop down but rather i want it to stay steady at its reached level like the yellow line in the picture i drew in paint.... How can this be possible?

 

Attachments

• capacitor.JPG

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indulis

New Member

• Jan 24, 2011

• #2

How about a diode in series with R1.

 

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EfeVural

New Member

• Jan 24, 2011

• #3

genious ! thank you

 

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gary350

Well-Known Member

• Jan 24, 2011

• #4

When you charge a large capacitor or a capacitor bank it is like a dead short on the power supply. You need a current limiting resistor to prevent it from destroying your rectifier. If you need it to charge faster use higher current diodes or put several diodes in parallel.

 

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indulis

New Member

• Jan 25, 2011

• #5

If you need it to charge faster use higher current diodes or put several diodes in parallel.

Click to expand...

that won't work because diodes have a negative Vfw coefficient. The first one to turn on will get warmer and it's forward voltage will drop and take all the current.