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Low noise Piezo stack driver amplifier design

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Deef700:
Hi all,

I am new on this great blog. I was triggered by this older topic due to the design discussion of the different piezo drivers, interesting. But what about the asymmetric high voltage power supply (booster ?) Does anybody know for example what design is probably used on the PDU150 for getting the asymmetric high voltage rails include negative value ?

Thanks.
Deef

dzseki:

--- Quote from: Deef700 on June 08, 2023, 10:51:35 am ---Hi all,

I am new on this great blog. I was triggered by this older topic due to the design discussion of the different piezo drivers, interesting. But what about the asymmetric high voltage power supply (booster ?) Does anybody know for example what design is probably used on the PDU150 for getting the asymmetric high voltage rails include negative value ?

Thanks.
Deef

--- End quote ---

Amplifiers are usually fed from symmetrical power supply voltages, but it is not a necessity, V+ and V- can be anywhere as long as their sum is within the specs of the given device. For the PDU150 I'm quite sure that they are using two DC-DC converters, one to gerenerate the negative supply  eg -15V and an other to generate the high voltage supply, that simple.

Deef700:
Thanks,
that sounds that easy.
Last question in this case about the power supply, which solutions for the DC converters (high + en low - voltage) should you take when you need  100mA RMS ?

mawyatt:
When we developed a high voltage piezo driver a number of years ago, these were asymmetrical waveform ranges and shouldn't be allowed to go very negative, and were for precision nanometer positioning devices from these folks:

https://www.pi-usa.us/en/products

So the + high voltage was created with a simple low current boost regulator from +12VDC to ~200VDC, and the negative was low current scavenged at ~ -30VDC.

Later we needed a HV AWG amplifier buffer amplifier, and required both + and - HV supply (+-175VDC), so we used the same technique of scavenging the negative voltage but at equal magnitude and current level as the + HV supply.

So a simple boost converter and scavenged negative supply worked well for our needs.

Best,

Deef700:
Thanks, interesting !
For building a prototype I am first of all trying to find and buy these boost converter and inverted buck boost converter now to get the required 150VDC and -30VDC. Some off the shelf solution for a first test will be helpful. I think both voltages needs to be quite stable as it is starting point for fine positioning of piezo stack.

Later on I will make an own design, already looking to components like the LTC3863 for the negative side for example.

Best regards
Deef

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