Projector

Details Projector Projector

2007-07-24

2007-07-24

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S225000, C315S291000, C315S224000, C315S307000, C353S085000, C323S282000, C323S285000

Reexamination Certificate

active

11444138

ABSTRACT:
The present invention is directed to decrease temperature rise in a power supply circuit in a standby mode by using existing signals and circuits while suppressing cost. In a power supply circuit having a power-factor improving circuit for improving a power factor seen from an AC power supply side, and a switching regulator constructed by a self-oscillating converter to which the power-factor improving circuit is connected on a primary side of a transformer and from which DC voltages for a load are output on a secondary side, a lamp turn-on permission signal to be supplied to a lamp driving circuit is detected by a signal detecting circuit. In a standby mode in which the lamp turn-on permission signal is not detected, operation of a PFC (Power Factor Correction) control unit provided in the power-factor improving circuit is stopped.

REFERENCES:
patent: 5917711 (1999-06-01), Shikata et al.
patent: 6154473 (2000-11-01), Watanabe
patent: 6177739 (2001-01-01), Matsudaira et al.
patent: 6750620 (2004-06-01), Suzuki
patent: 7040762 (2006-05-01), Yasuda
patent: 11-308858 (1999-11-01), None
patent: 2004-361466 (2004-12-01), None
Patent Abstracts of Japan, Publication No. 2004-361466, Publication Date: Dec. 24, 2004, 2 pages.
Patent Abstracts of Japan, Publication No. 11-308858, Publication Date: Nov. 5, 1999, 1 page.

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