HELP

Discussion in 'The Projects Forum' started by kince, Mar 19, 2013.

  1. kince

    Thread Starter New Member

    Feb 26, 2013
    2
    0
    Hi I'm working on a energy harvesting circuit, and i want to harvest from Face Piezeo TH-7R using harvesting chip LTC3588.

    The problem is, my input voltage from the piezo is about 150Vp-p and the chip states it will only take in Vin max at 18V.

    I have connected some caps in parallel to step down the input to around 20p-p, but it seems to give me very minimal power at 3.3V, which cant even power a tiny LED.

    I suspect that it has got to do with the caps.

    Any suggestions to step it down by other means? Is resistor possible?

    datsheet: 7R http://216.71.30.251/Face%20International/7r-ds.pdf

    datasheet: LTC3588 http://www.linear.com/docs/28909
     
    Last edited: Mar 19, 2013
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,004
    1,522
    How are you using a piezo speaker to harvest energy? What is driving the speaker to give you a couple of times the rated voltage for the speaker. Some things need to be explained more. Post your schematic.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,420
    3,355
    HELP - you can do better than that. Provide a proper title.
     
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