voltage multiplier current demands

razorrick1293 · 15th January 2011, 09:36 PM

Hello,
if i was to use a voltage multiplier to get 100v to 400v, how much more current would i need to power an amp? the overall current drawn from the amp is about 400mA and i have a 0-100v rated at 2A. will it reduce the curent i can draw without damaging the transformer? im thinking there might be something like 2X(100/400)=max current out, or is this wrong?

singa · 16th January 2011, 05:29 AM

Hi,
Voltage multiplyers don't have good efficiency as it is dependent on the
capacitor at the multiplyer stage that is the time constant or charging vs
the rectifying section be it silicon diodes or tube.400mA for high voltage
supply is not trivial.So for best performance it's best to use proper transformer
turns ratio ( step up) to get the high voltage you need.Singa

Elvee · 16th January 2011, 07:42 AM

Voltage multipliers are a sub-variety of peak rectifiers, which means that for usual power levels and capacitance values found in electronics, the power factor will be around 0.5.

In order to get 400V output, you'll have to use a 3 stage multiplier.
Thus, IDC out= 2/(2*3)=0.333A.

This value is a crude approximation, and if you need more accuracy, you have to simulate the circuit.

15th January 2011, 09:36 PM	#1
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	voltage multiplier current demands Hello, if i was to use a voltage multiplier to get 100v to 400v, how much more current would i need to power an amp? the overall current drawn from the amp is about 400mA and i have a 0-100v rated at 2A. will it reduce the curent i can draw without damaging the transformer? im thinking there might be something like 2X(100/400)=max current out, or is this wrong?

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16th January 2011, 05:29 AM	#2
singa diyAudio Member Join Date: Apr 2004 Location: near	Hi, Voltage multiplyers don't have good efficiency as it is dependent on the capacitor at the multiplyer stage that is the time constant or charging vs the rectifying section be it silicon diodes or tube.400mA for high voltage supply is not trivial.So for best performance it's best to use proper transformer turns ratio ( step up) to get the high voltage you need.Singa

16th January 2011, 07:42 AM	#3
Elvee diyAudio Member Join Date: Sep 2006	Voltage multipliers are a sub-variety of peak rectifiers, which means that for usual power levels and capacitance values found in electronics, the power factor will be around 0.5. In order to get 400V output, you'll have to use a 3 stage multiplier. Thus, IDC out= 2/(2*3)=0.333A. This value is a crude approximation, and if you need more accuracy, you have to simulate the circuit.

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