Title:
CHARGING CIRCUIT
Document Type and Number:
WIPO Patent Application WO2003065540
Kind Code:
A3
Abstract:
A charging circuit, and method of performing the same, having a primary switching circuit (110, 140) that controls the transfer of energy between windings (110, 112) in a transformer based upon a reconstruction of a secondary winding current, in a primary winding side of the transformer, without directly sampling the secondary winding current, such that the secondary winding is isolated from the primary winding. The reconstruction of secondary winding current is performed by sampling a voltage across the primary winding reflected from the secondary winding, and integrating the sampled voltage using a current source driven according to the sampled voltage and a capacitor. The primary switching circuit operates to turn on an energizing of the primary winding when the integrated sampled voltage indicates that the flux density of the transformer, after a transfer of energy between primary and secondary windings, lowers to a predetermined level.
More Like This:
| JP2002171685 | BATTERY CHARGER |
| JP3132798 | CHARGING CONTROLLER FOR STORAGE BATTERY |
Inventors:
MULHAUSER DANIEL F
Application Number:
PCT/IB2003/000157
Publication Date:
December 24, 2003
Filing Date:
January 20, 2003
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H02J7/10; H02M3/335; (IPC1-7): H02M3/335
Foreign References:
| US5757625A | 1998-05-26 | |||
| US5438499A | 1995-08-01 | |||
| US5874841A | 1999-02-23 |
Other References:
See also references of EP 1472778A2
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