Transformer-isolated power transfer apparatus having intermitten

Details Transformer-isolated power transfer apparatus having intermitten Transformer-isolated power transfer apparatus having intermitten

1997-12-23

1999-04-27

Riley, Shawn

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

H02M 3335

Patent

active

058985786

ABSTRACT:
A transformer-isolated power transfer apparatus included in a power supply body and a device body that are removably coupled together. The power supply body contains a primary winding and a secondary winding for transmitting electrical power. The device body contains an induction winding and a load. When the power supply body and device body are coupled together, the secondary winding in the power supply body is electromagnetically inductively coupled to the induction winding provided in the device body to transfer power from the power supply body to the device body via electromagnetic inductive coupling. The apparatus further includes detection circuitry that detects when the power supply body and the device body are coupled together. The power supply body further contains an oscillation drive circuit that drives the primary winding in the power supply body in an intermittent oscillation mode of operation when the detection circuitry detects that the power supply body is not coupled to the device body, and that drives the primary winding in the power supply body in a continuous oscillation mode of operation when the detection circuitry detects that the power supply body is coupled to the device body. During the intermittent oscillation mode of operation, the oscillation on period is controllably varied in response to variations in an input voltage in a manner such as to maintain an average power transmitted from the power supply body to the device body at a substantially constant level. In this manner, the detection circuitry can reliably detect when the power supply body and the device body are coupled together despite variations in the input voltage.

REFERENCES:
patent: 4654771 (1987-03-01), Stasch et al.
patent: 4942508 (1990-07-01), Nakamura
patent: 4956761 (1990-09-01), Higashi

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