Hello,
I have designed a high voltage output (6000V) supply using a fly-back converter. I need to measure the output voltage with a DSP, but the output voltage must be at most 0.1V. This is not achievable with the 12-bit or 16-bit single ended/differential sensors on the TI DSP board that I am using to control it. I instead want to extract, measure, and amplify the output voltage ripple and use that within the control system. The method I have used is the most simple, but it doesn't seem to be performing as I desire. I will attach an .asc simulation of the circuit. It seems that the DC offset is not being added to the AC ripple - I am using a 3V supply and two 10K resistors to offset by 1.5V, which is the mid-range of the ADC input of 0-3V.
Is there a better way to do this, or any suggestions to improve this existing circuit? Can anyone help me understand what is going wrong? This is the most simple method I know of adding DC offset.
SiC
I have designed a high voltage output (6000V) supply using a fly-back converter. I need to measure the output voltage with a DSP, but the output voltage must be at most 0.1V. This is not achievable with the 12-bit or 16-bit single ended/differential sensors on the TI DSP board that I am using to control it. I instead want to extract, measure, and amplify the output voltage ripple and use that within the control system. The method I have used is the most simple, but it doesn't seem to be performing as I desire. I will attach an .asc simulation of the circuit. It seems that the DC offset is not being added to the AC ripple - I am using a 3V supply and two 10K resistors to offset by 1.5V, which is the mid-range of the ADC input of 0-3V.
Is there a better way to do this, or any suggestions to improve this existing circuit? Can anyone help me understand what is going wrong? This is the most simple method I know of adding DC offset.
SiC
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