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Old 3rd March 2013, 11:51 AM   #11
MarianB is offline MarianB  Romania
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Virtual/floating ground creates problems on interconection between stages, you have to be sure it is ok to use it, you have to make sure it will not affect or be affected by other circuits connected to it...

This is my sugested solution
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Old 3rd March 2013, 12:20 PM   #12
Elvee is offline Elvee  Belgium
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A basic example of capacitive, non floating supply:
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Old 3rd March 2013, 12:31 PM   #13
MarianB is offline MarianB  Romania
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That is just a voltage doubler, and what i have sugested...

PS: What use do you have for R1 and C1?
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Old 3rd March 2013, 12:58 PM   #14
FoMoCo is offline FoMoCo  United States
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One easy solution would be a simple DC-DC converter designed for telecom use. They're 48 Vdc in and you can choose the desired output voltages. They usually will tolerate 36-72 volts on the input.
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Old 3rd March 2013, 02:23 PM   #15
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by MarianB View Post
That is just a voltage doubler, and what i have sugested...

PS: What use do you have for R1 and C1?
It would become a voltage doubler if it happened to be operated open circuit, which is normally never the case.
R1 limits current spikes, at power on for instance, and C1 sets the average output current. Each cycle, it transfers a charge of C1*2*Vpeak to one of the outputs, leading to an average current of Q*Fmains, 50Hz in this case.
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