BQ25504 for Piezo or Vibation?

Günter Gerold

Prodigy 40 points

Other Parts Discussed in Thread: BQ25504

Hello,

how do i harvest AC Sources with low Voltage (BQ25504)? I think a bridge Rectivier is no good idea...

over 12 years ago

0 Jeff F over 12 years ago

TI__Guru**** 166486 points

Bridge rectifier is the best option.

0 Hugo Vihvelin over 12 years ago in reply to Jeff F

Prodigy 20 points

What is the minimum required voltage for the BQ25504 to charge a capacitor or supercapacitor?

I have a low-voltage piezoelectric source that I would like to connect to a bridge rectifier + smoothing capacitor, and then to the BQ25504 but am worried about its ability to charge. My assumption is that anywhere from 0.5 to 1V will be available after the rectifier stage.

Any extra information is appreciated!

0 Jeff F over 12 years ago in reply to Hugo Vihvelin

TI__Guru**** 166486 points

If VSTOR < 1.8V, Vin needs to be at least 330mV for the less efficiency "cold start" boost converter to operate.. Once VSTOR>1.8V, Vin can drop to 130mV and the normal boost converter will operate.

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BQ25504 for Piezo or Vibation?