Method for a battery and passive power supply to an RFID tag and a switching circuit for carrying out said method
US9239980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2009 |
| Grant date | Jan 19, 2016 |
| Priority date | — |
| Expiry date | Oct 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0717
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A controlled switching circuit (csc) comprises two controlled switches (cs1, cs2) fabricated with PINTOS transistors and connected between its output terminal as well as a battery (b) or a rectifier rectifying voltage induced in an antenna. Conditions of the battery voltage and the rectified voltage with a time delay are checked. Only when the battery voltage gets unacceptable and the value of rectified voltage exceeded a preset value tag circuits are supplied by the rectified voltage induced in an antenna.The invention provides for an automatic selection of a way of supplying an RFID tag in a way that it is stably supplied by a battery as far as still possible, but just according to the invention this is rendered possible for a longer time due to a very low voltage drop across a controlled switching circuit, and that a supply by a radio-frequency radiation field is selected only when the battery gets depleted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.