Power supply circuit that sources energy from an NFC antenna
US11283487B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2020 |
| Grant date | Mar 22, 2022 |
| Priority date | — |
| Expiry date | Jul 15, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/79
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply circuit is described herein which is capable of sourcing energy from an NFC antenna. In one embodiment, the circuit comprises a rectifier circuit configured to be coupled to an NFC antenna for receiving an antenna voltage, a filter coupled to an output of the rectifier circuit and configured to provide the rectified and smoothed antenna voltage as supply voltage, and a current limiting device coupled between the filter and an output node and configured to limit an output current provided at the output node dependent on a control signal. Further, the power supply circuit comprises a control circuit configured to receive the supply voltage and a reference voltage and to generate the control signal dependent on a difference between the reference voltage and the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.