Title of Invention

PROTECTION CIRCUIT FOR A SWITCHED MODE POWER SUPPLY

Abstract Protection circute for a switched mode power supply The invention relates to a protection circuit for a switchede mode power supply comprising a transformer with a primary winding (W1) and secondary winding (W2 - W6),a switching transistor (TP20) in series with the primary winding (W1) and a driver stage (TP22) and/or a control capacitor (CP22) for the switching transistor (TP20). The protection circuit comprises a storage capacitor (CP37) which is coupled with a terminal (6) of a secondary winding (W3) which charges said storage capacitor (CP37) during the on-interval of the switching transistor (TP20. During the off-interval of the switching transistor the charge of the storage capacitor (CP37)is fed to the driver stage or the control capacitor (CP22) for closing or keeping closed the switching transistor when one of the secondary windings (W2 - W6) has a short circuit.
Full Text

Documents:

http://ipindiaonline.gov.in/documentkol/890-CAL-1999/890-CAL-1999-FORM-27.pdf


Patent Number 203597
Indian Patent Application Number 890/CAL/1999
PG Journal Number 11/2007
Publication Date 16-Mar-2007
Grant Date 16-Mar-2007
Date of Filing 09-Nov-1999
Name of Patentee THOMSON MULTIMEDIA
Applicant Address 46, QUAI A. LE GALLO, F-92100 BOULOGNE-BILLANCOURT, FRANCE
Inventors:
# Inventor's Name Inventor's Address
1 ZEE KUM YOONG 39, JALAN ANGGEREK 27 TAMAN JOHOR JAYA, J.B. 81100 JOHOR, MALAYSIA
2 KOH KIAN MENG BLK 897B, 08-182 WOODLANDS DRIVE 50, SINGAPORE 731897
3 NG SENG HUAT BLK 154, 12-87 JALAN TECK WHYE SINGAPORE 680154
PCT International Classification Number H03M 3/335
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 98121390.3 1998-11-11 EPO