Search International and National Patent Collections

1. (WO2001006630) POWER RECEPTION CIRCUITS FOR A DEVICE RECEIVING AN AC POWER SIGNAL

Pub. No.:    WO/2001/006630    International Application No.:    PCT/US2000/018273
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Sat Jul 01 01:59:59 CEST 2000
IPC: G06K 19/07
H02J 5/00
H02M 7/217
Applicants: MOTOROLA INC.,
Inventors: CONNELL, Lawrence, Edwin
RAKERS, Patrick, Lee
COLLINS, Timothy, James
LEMERSAL, Donald, Bernard, Jr.
Title: POWER RECEPTION CIRCUITS FOR A DEVICE RECEIVING AN AC POWER SIGNAL
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.