Power management in an electromagnetic transponder
First Claim
Patent Images
1. An electromagnetic transponder comprising:
- an oscillating circuit;
a first rectifying bridge having first and second alternating current (AC) input terminals connected across the oscillating circuit and having at least two controllable rectifying elements;
a battery configured to provide an output voltage that controls the at least two controllable rectifying elements;
a second rectifying bridge having first and second inputs and an output, the inputs being coupled across the oscillating circuit andan amplitude demodulator having an input coupled to the output of the second rectifying bridge.
2 Assignments
0 Petitions
Accused Products
Abstract
An electromagnetic transponder includes an oscillatory circuit, a battery and a first rectifier bridge. Alternating current input terminals of the rectifier bridge are connected to the terminals of the oscillatory circuit, and at least two rectifier elements of the rectifier bridge are controllable on the basis of the voltage supplied by the battery.
23 Citations
18 Claims
-
1. An electromagnetic transponder comprising:
-
an oscillating circuit; a first rectifying bridge having first and second alternating current (AC) input terminals connected across the oscillating circuit and having at least two controllable rectifying elements; a battery configured to provide an output voltage that controls the at least two controllable rectifying elements; a second rectifying bridge having first and second inputs and an output, the inputs being coupled across the oscillating circuit and an amplitude demodulator having an input coupled to the output of the second rectifying bridge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An electromagnetic transponder comprising:
-
an oscillating circuit; a first rectifying bridge having first and second alternating current (AC) input terminals connected across the oscillating circuit and having at least two controllable rectifying elements, wherein said at least two controllable rectifying elements include first and second transistors; a battery configured to provide an output voltage that controls the at least two controllable rectifying elements; a first series association of a first resistive element and a third transistor coupled between the first AC input terminal of the first rectifying bridge and a reference potential terminal; and a second series association of a second resistive element and a fourth transistor coupled between the second AC input terminal of the first rectifying bridge and the reference potential terminal. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. An electromagnetic transponder comprising:
-
an oscillating circuit; a first rectifying bridge having first and second alternating current (AC) input terminals connected across the oscillating circuit and having at least two controllable rectifying elements; a battery configured to provide an output voltage that controls the at least two controllable rectifying elements; and a comparator configured to compare a level of the output voltage of the battery with a threshold and provide an output that controls the first rectifying bridge. - View Dependent Claims (15, 16, 17, 18)
-
Specification