Title:
MONITOR DEFLECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO2002052533
Kind Code:
A3
Abstract:
A monitor deflection circuit includes a bipolar power transistor for applying power from a high voltage supply to a horizontal deflection coil. The monitor deflection circuit further includes a base drive circuit for selectively turning the bipolar power transistor on and off. The base drive circuit includes a flyback transformer having a primary winding and a secondary winding coupled to the base of the bipolar power transistor, a voltage source coupled to one end of the primary winding, and a drive switch coupling the other end of the primary winding to ground. The base driver circuit further includes a constant current circuit coupled between the voltage source and the primary winding of the flyback transformer for controlling a base current of the bipolar power transistor before the bipolar power transistor conducts.
Inventors:
QIAN JINRONG
Application Number:
PCT/IB2001/002668
Publication Date:
October 31, 2002
Filing Date:
December 19, 2001
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
G09G1/04; H03K4/62; H04N3/16; H04N3/18; (IPC1-7): H03K4/62; G09G1/04
Foreign References:
| US5614794A | 1997-03-25 | |||
| US5808426A | 1998-09-15 | |||
| US4177393A | 1979-12-04 |
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