Giant magnetroresistive ratio sensing system

Details Giant magnetroresistive ratio sensing system Giant magnetroresistive ratio sensing system

1998-04-07

1999-11-30

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

320166, 607 14, H01M 1044, H01M 1046

Patent

active

059948809

ABSTRACT:
A magnetic sensing circuit is arranged in cooperative relation to a flyback transformer in a capacitor charging circuit for directly sensing the state of the transformer magnetic field for controlling the switching of power to the primary winding of the flyback transformer. A first threshold is sensed when the flyback transformer is nearly saturated with magnetic energy storage. A second threshold is sensed when all of the magnetic energy stored in the flyback transformer has been transferred to the capacitor. The sensed thresholds are used to optimally control the switching of power to the primary winding to maximize the efficiency and minimize the charging time of the capacitor charging circuit. A capacitor charging circuit which utilizes the present invention can be part of an implantable cardioverter defibrillator.

REFERENCES:
patent: 5709225 (1998-01-01), Budgifvars et al.
patent: 5722998 (1998-03-01), Prutchi et al.
patent: 5764052 (1998-06-01), Renger
patent: 5782883 (1998-07-01), Kroll et al.
Klopper et al. A sensor for Balancing Flux in Converters with a High-Frequency Transformer Link, IEEE Transactions on Industry Applications, 33.3 pp. 774,1997.
Moskowicz. Transformer Sensor of Magnetic Field Intensity. Third International Symposium on Mehtods and Models in Automation and Robotics, Sept. 1996.
NonVolatile Electronics, Inc. Engineering and Application Notes. Internet Oct. 6, 1997.
NonVolatile Electronics, Inc. An ISO 9001 Certified Company. Internet Jan. 1998.

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