Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1999-07-19
2000-10-17
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 70, H02M 542, H02M 700
Patent
active
061341304
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.
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Collins Timothy James
Connell Lawrence Edwin
Lemersal, Jr. Donald Bernard
Rakers Patrick Lee
Motorola Inc.
Santema Steven R.
Vu Bao Q.
Wong Peter S.
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