Power reception circuits for a device receiving an AC power signal
First Claim
1. A power reception circuit comprising:
- a power rectifier operably coupled to an AC input power signal and including a first pair of output terminals, the power rectifier rectifying the input power signal, yielding a rectified output waveform across the first pair of output terminals;
a shunt rectifier connected in parallel with the power rectifier and including a second pair of output terminals; and
a shunting element connected across the second pair of output terminals.
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Accused Products
Abstract
Power reception circuits employable in portable data devices (e.g., smart cards) to derive power and/or data from an input AC power signal (e.g., an ASK modulated carrier signal). In one embodiment, the power reception circuit comprises a power rectifier (120), a shunt rectifier (142) and a shunting element (132). The power rectifier (120) is adapted to rectify the input power signal, yielding a rectified output waveform. The shunt rectifier (142) is connected in parallel with the power rectifier (120). The shunting element (132) is connected to the shunt rectifier (142) and is operable to regulate an output voltage or current waveform produced at the output of the power rectifier (120). In another embodiment, the power reception circuit includes an analog circuit (610) for recovering data from a modulated carrier signal. A decoupling device (630) isolates the analog circuit (610) from impedance variations of a load. A shunt device (640) diverts undesired current from the load.
179 Citations
21 Claims
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1. A power reception circuit comprising:
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a power rectifier operably coupled to an AC input power signal and including a first pair of output terminals, the power rectifier rectifying the input power signal, yielding a rectified output waveform across the first pair of output terminals; a shunt rectifier connected in parallel with the power rectifier and including a second pair of output terminals; and a shunting element connected across the second pair of output terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power reception circuit comprising:
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a first and second shunting element each having an input terminal operably coupled to an input power node; the first shunting element having an output terminal operably coupled to a load and being adapted to isolate the input power node from impedance variations of the load, the second shunting element being adapted to divert undesired current from the load. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A portable data device comprising:
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an antenna element for receiving a modulated carrier signal at an input power node; an analog circuit for deriving data from the modulated carrier signal; and a power reception circuit for deriving power from the modulated carrier signal, the power reception circuit including first and second shunting elements operable in combination to regulate a voltage level appearing at the input power node, the first shunting element regulating to a first voltage level and the second shunting element regulating to a second voltage level. - View Dependent Claims (21)
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Specification