Oscillation maintenance circuit with trigger-based pulse generation in half-duplex RFID transponders
US10552723B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2017 |
| Grant date | Feb 4, 2020 |
| Priority date | — |
| Expiry date | Oct 10, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1228
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A half-duplex RFID oscillation maintenance circuit with trigger-based pulse generation is provided, including: a resonance inductor and a resonance capacitor forming an L-C resonance circuit coupled to an external radio frequency field to generate alternating current for a rectifier circuit, which is connected to an energy-storage capacitor. A first antenna end is connected to a trigger circuit through a switch unit and a resistor connected in series; and an output end of the trigger circuit is connected to a control end of the switch unit. The trigger circuit is configured to sample an oscillation signal at the first antenna end to generate a rectangular wave signal, whose pulse width can be self-adaptively adjusted, to control OFF/ON of the switch unit and, when the switch unit is ON, to form a current injection loop from the energy-storage capacitor to the L-C resonance circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.