Electronics > Beginners
Voltage multiplier
sureshot:
I was looking to increase a linear transformer secondary voltage for input to linear regulators. In the image attached, would this be of use if the diodes where larger say 6 or 10 Amp diodes.
Any help appreciated.
Zero999:
It will work, as long as the diodes are adequately rated. The main issue with this is the capacitors would need to be huge, since it's two half wave rectifiers.
The correct solution is to simply use the correct voltage transformer, in the first place.
sureshot:
Interesting, thank you for the reply. I did wander what it would be like under load conditions. I was thinking 12 Volt transformer using 2 x 50 Volt 10000uf electrolytic capacitors and 2 x 10 Amp rectifier diodes. For up to 3 Amps output continuous from a boosted 7812 voltage regulator.
John B:
The more useful application in a linear regulator is the use of 2 charge pumps to create low current power rails both above and below the full wave rectified main power rail. These 2 extra rails can be clamped and regulated to power op amps, so that they can sense down to and just below 0V. You have to tweak the impedance of the charge pumps to account for the needed current, mainly to reduce the peak voltages. You can start exceeding the maximum voltages of linear regs etc. But not with a 12V transformer, you need a higher voltage one.
sureshot:
Thank you for the info, yes I won't exceed the transformers current rating at the higher voltage level. I use series pass transistors with linear voltage regulators, it's handy to know if a transformer I already have doesn't come up to the voltage I need this is an option.
Bit of what I put together using cpu coolers.
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