Bistable Wireless Power Transfer
To design a safe and efficient wireless power transfer (WPT) to charge implantable biomedical devices.
Traditional inductive WPT transmitters operate at a magnetic field of ~1 Mhz, which is incompatible with health standards.
We aim at reducing this frequency to ~1 Hz, to limit the absorption into the body and allow greater efficiency at no risk to health.
To decrease the frequency of magnetic field we proposed to:\
- Use a mechanical receiver (instead of inductive) to lower the natural pulsation.
- Exploit structural multistability to enhance low-frequency energetic behaviours.
To achieve this, we designed a receiver with:\ - A buckled-beams based structure inducing bistability.
- A magnetic mass moving with the B field.
- A piezoelectric stack converting mechanical energy to an electrical form.
