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DRV2667EVM-CT: Offset voltage signal so that lowest is 0V

Kate Lee
Prodigy 250 points
Part Number: DRV2667EVM-CT
Other Parts Discussed in Thread: DRV2667, DRV2700EVM-HV500,

Hello,

I'm currently trying to power a piezo actuator but I'm having a slight difficulty due to the peak-to-peak voltages. I know that the DRV2667 operates at 200Vpp maximum (so I'm assuming from -100V to 100V) but I need a higher voltage to excite my actuator. Is some way to offset the voltage signal (in Sine or Square function form) so that it goes from 0V to 200V? Could this be done by the 'Design and Test' modes in the embedded software?

Thank you.

Kate

  • 0
    TI__Expert 8721 points
    Hi Kate,

    The boost is only capable of 100V, so we can only provide 100V to the positive and negative outputs giving 200Vpp. Have you looked at the DRV2700EVM-HV500 design? This is capable of higher output voltage, but it is an analog input device.
  • 0 in reply to Kelly Griffin
    Prodigy 250 points

    Hi Kelly,

    Thank you for your recommendation. I just looked at the DRV2700EVM-HV500 Design, and it seems perfect for our application. Just to confirm, it mentions an EVM Control Software, so this design does come with a software to drive the actuator with different input signals? I'm wondering if controlling and designing different waveform is as simple as the DRV2667EVM-CT, or if we need to attach a separate external analog input.


    Thank you for your help.

    Kate

  • 0 in reply to Kate Lee
    TI__Expert 8721 points
    Hi Kate,

    The software for this EVM is Piezo Control Console. The MCU is still a MSP430 that outputs a PWM signal. The signal goes through a LPF before reaching the analog inputs. The waveforms may be a little more difficult to implement with this software, but there is a WaveBuilder tab. This tab has some pre-defined waves like triangle, impulse and sine waves. You control the resolution with the “time between steps” setting. You can also change the jumpers to use an analog input from a waveform generator.