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DRV2667EVM-CT: Suitable as alternative power driver for piezoelectric valve?

Erik Paardekam
Prodigy 40 points
Part Number: DRV2667EVM-CT
Other Parts Discussed in Thread: DRV2667, , DRV2700EVM-HV500

For a project, I am exploring whether it is possible to use the DRV2667EVM-CT's voltage output to control a piezoelectric valve, as a lower-cost alternative to a more standard piezo controller. I am using an Arduino Uno to control the EVM via I2C, and it is able to play waveforms in this mode (as described in pages 18-20 of this document www.ti.com/.../drv2667.pdf). 

What I would really like the EVM to do is output a stable voltage at a level that I can specify (and change) with my Arduino program. Is it possible to generate a stable DC voltage with this EVM, and if so, how can it be accomplished? 

I look forward to hearing from you. 

  • 0
    TI__Guru* 84915 points

    Hi, Erik,

    Welcome to E2E and thank you for your interest in our products!

    Could you provide the piezoelectric valve specifications (capacitance, impedance, rated voltage) in order to determine if the DRV2667 is the best option for you?

    Usually, our piezo drivers are not capable to handle constant DC levels. So, I would like to recommend an alternative for you based on the valve characteristics.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 40 points

    Hi Luis, 

    Thank you for your response. The valve is a Festo piezoelectric valve type VEMP-BS-3-13-D7 as shown in this catalogue (https://www.festo.com/media/pim/623/D15000100140623.PDF). Most of the flow regulation happens between 50 V and 200 V (full range 0 - 250 V). The capacitance is listed as > 32 nF at room temperature, measured at 1V / 1 kHz RMS. I was unable to find the impedance, but they recommend a 50 kOhm resistor be used as a current limiter. 

    I would highly appreciate recommendations for an alternative power solution, if the DRV2667 is unsuitable. Thanks again for your time. 

  • 0 in reply to Erik Paardekam
    TI__Guru* 84915 points

    Hi, Erik,

    Unfortunately, I think our piezo drivers won't be capable to handle this kind of valves. It's operational frequency is actually below 5Hz. Our piezo drivers solutions require to filter the DC components with some input capacitors, resulting in high-pass filters of around 80-100Hz. This filter would make the valve inoperable. Sorry, I couldn't find any other product in our portfolio that could help you in this case.

    Best regards,
    Luis Fernando Rodríguez S.

    The DRV2667 Does not require DC blocking capacitors on the input pins, and it is therefore able to drive DC at up too 105V DC. If you need a solution to drive DC at higher voltages please refer to the DRV2700EVM-HV500 reference design/EVM

    https://www.ti.com/tool/DRV2700EVM-HV500

    Regards,

    Arthur Brown

    Low Power Audio Applications

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 40 points

    Thank you for your input. I'll have to look for something else.