 HV protection circuitry and common design guidelines
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rp181
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Thu May 31 2012, 06:47PM
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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
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I will be designing a multichannel power amplifier soon. I will be using PA78 HV Op-Amps (Digikey) with this power supply.. This module outputs 380V, but my output should never exceed ~200V (Can anyone find a similar module with this output?) The output voltage will be controlled with a 16 bit DAC. I plan on limiting the gain of the Op-Amp to prevent the voltage from going too high, but what are some ways I can ensure the output on each channel never goes past a set voltage? I need to protect the output at all costs- I would much rather build a new driver than damage the piezoelectric system it will be driving.
What are some ways I can do this, and what are some common guidelines for designing circuits like these?
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Sulaiman
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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
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The simplest is to put a suitable (string) of zener or tvs diodes from the output to the inverting input.
The diodes will have capacitance which must be accounted for in the feedback design.
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