Power transfer circuit including a sympathetic resonator

Details Power transfer circuit including a sympathetic resonator Power transfer circuit including a sympathetic resonator

1988-03-18

1989-01-31

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 20, 363 90, H02P 1300

Patent

active

048020800

ABSTRACT:
A power transfer circuit includes first and second windings (L1, L2) sharing a common magnetic core (101). Each winding has associated with it a parallel capacitor to thus form a pair of "tank" circuits. The first winding (L1) is connected at one end to a voltage supply and, at the other end, to ground through an FET switch (100,200). The switch (100,200) is turned on and off at a predetermined frequency and at a 50% duty cycle. The second winding (L2) and associated capacitor (C2) achieves parallel resonance at the predetermined frequency. Similarly the combined first and second windings (L1,L2) and associated capacitors (C1,C2) achieve parallel resonance at said predetermined frequency. The second winding (L2) need not be electrically connected to the first winding (L1) which transfers energy to it through the magnetic core (101). The transfer circuit efficiently couples power across a dielectric interface to a pickup coil (L3). One particularly good application of the power transfer circuit is in connection with a contactless Smart Card.

REFERENCES:
patent: 3531737 (1970-09-01), Thakore
patent: 4027200 (1977-05-01), Sahara et al.
patent: 4277837 (1981-07-01), Stuckert
patent: 4284489 (1981-08-01), Weber
patent: 4325008 (1982-04-01), Borland et al.
patent: 4480178 (1984-10-01), Miller et al.
patent: 4499530 (1985-02-01), Onda et al.
patent: 4631652 (1986-12-01), Wendt
patent: 4692604 (1987-09-01), Billings
Application Ser. #851,849 Files 4-14-86, "Power Regulator for a Contactless redit Card System", R. L. Billings.
"Does Your Coupling Coefficient Matter?", Electronics & Wireless World, Tom Ivall, 6/87, pp. 577-579.

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