Generating negative voltages

[PlatinumT]

generating negative voltage

What are the most common ways to generate negative volages?


Thanks,
Platinum

 

[FoxyRick]

how to generate negative voltage

These days, I just use an off-the-shelf switching regulator to generate the negative from positive when no double-ended supply is available.

For circuits and descriptions of how switchers generate negative voltages, try here:

http://www.epanorama.net/links/psu_switching.html#switchnegative
**broken link removed**
http://www.armory.com/~rstevew/Public/PSUs/-vgen.html

For some good, simple switcher circuits (not inverting though)

**broken link removed**

Cheers,
FoxyRick.

 

[koky]

generating negative voltage from positive

ICL7760 need only 2 capacitor and 8 pin chip

 

[Nicholas]

generate negative voltage

Voltage regulator ICs such as LM7905 can do.

 

[eltonjohn]

generate negative voltage from positive

basically there are two ways to generate negatives volatges from a positive source . A switching power supply with transformer or coil ..
depending on your power requirements .. it can be as easy as a transistor and a coil. The second possibility is a "CHARGE PUMP " is basically an analog switch commuting the poles of a capacitor .. poe A is connected to positive source .. pole B is grounded .. is charged in time T depending of the cap capacity . Next cycle capacitor is completly disconnected from source and pole A is grounded pole B is connected to LOAD .. The best configuration is to have two caps while one gets charged by the source the other powers the load.

 

[Analyzer]

generating a negative voltage

You mean negative voltage from positive source or you mean to generate negative voltage from AC source? If you want to generate neg. volt. from positive try to use SMPS to produce from positive.There are many chips and designs for it.Simply google it.
If you want to produce from AC, it is very easy to produce it.There are many instant chips like LM79XX.Just regulate it with bridge diode and apply to 79XX you'll get negative voltage.

Analyzer.