Inductively coupled energy and communication apparatus

Details Inductively coupled energy and communication apparatus Inductively coupled energy and communication apparatus

1997-08-29

1999-01-05

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 91, 307104, 307 17, 280735, 439 15, 439950, 336DIG2, B60R 2132

Patent

active

058567100

ABSTRACT:
An apparatus for transferring power and communication data across an annular gap comprises an inductively-coupled primary coil winding and secondary coil winding rotatable therein. Two signal oscillators are electrically coupled to a transistor for controlling current flow through the primary coil winding, thereby inducing a signal with a respective frequency in the secondary coil winding. An electronic switch operates so as to apply one of the two signals to the transistor for charging a capacitor coupled to the secondary coil winding, and operates so as to apply the other of the two signals to the transistor for discharging the capacitor. Actuation of control devices operate so as to modulate the impedance of the secondary coil winding. The inductive coupling of the two coil windings results in this modulation being mirrored by a modulation of the voltage developed across the primary coil winding. The primary coil winding voltage is compared to a threshold voltage for decoding the modulated voltage and determining actuation of the control devices.

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"Rotary Transformer Power and Data Transfer", Research Disclosure, #33505, Mar. 1992 p. 165.

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