Circuit arrangement and method for supplying power to a transponder
AssigneeATMEL Germany GmbH
InventorsDaniel Moser, Helmut Moser
Life of this patent
Estimating the term…
Abstract
A circuit arrangement is provided for a power supply to a transponder including an antenna resonant circuit and a downstream rectifier circuit for receiving and for rectifying an electromagnetic signal, a charging capacitor connected downstream on the output side of the rectifier circuit to provide a first supply voltage, with a tuning circuit for tuning the antenna resonant circuit to its resonance frequency, and with an auxiliary voltage source, which is designed to provide a second supply voltage, lower than the first supply voltage, for supplying the tuning circuit. A method is also provided for supplying power to a transponder with a first supply voltage, as well as a transponder having a circuit arrangement for a power supply.
Claims20
A circuit arrangement for a power supply to a transponder, the circuit arrangement comprising:
- an antenna resonant circuit and a downstream rectifier circuit for receiving and for rectifying an electromagnetic signal;
- a charging capacitor connected downstream of an output side of the rectifier circuit to provide a first supply voltage;
- a tuning circuit for tuning the antenna resonant circuit to a resonance frequency;
- and
- an auxiliary voltage source for providing a second supply voltage that is lower than the first supply voltage to the tuning circuit.
A method for supplying power to a transponder with a first supply voltage, the method comprising the steps of:
- tuning, during a first operating mode, a first capacitive element of a receiving-side antenna resonant circuit to its resonance frequency and during which a charging capacitor remains inactive;
- and
- charging, during a second operating mode, the charging capacitor to provide the first supply voltage.
A transponder for a tire pressure control system, the transponder comprising:
- a receiving path in which a circuit arrangement is located for power supply to the transponder, the circuit arrangement comprising:
- an antenna resonant circuit and a downstream rectifier circuit for receiving and for rectifying an electromagnetic signal;
- a charging capacitor connected downstream of an output side of the rectifier circuit to provide a first supply voltage;
- a tuning circuit for tuning the antenna resonant circuit to a resonance frequency;
- and
- an auxiliary voltage source for providing a second supply voltage that is lower than the first supply voltage to the tuning circuit.
Dependencies are inferred from the claim text.