Discharge lamp igniting apparatus including feedback control

Details Discharge lamp igniting apparatus including feedback control Discharge lamp igniting apparatus including feedback control

1997-03-11

1999-09-14

Vu, David H.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315DIG4, H05B 3702

Patent

active

059527935

ABSTRACT:
A current flowing through a discharge lamp 4 is detected by a current detecting circuit 5, and the detected current is outputted as a lamp current signal A to a feedback control circuit 7 where a difference between the lamp current signal A and the dimming control signal B is obtained and amplified, and then a simplified signal D is outputted to an adder 12 which adds the amplified signal D to the dimming control signal B to constitute a control signal E. The control signal is fed back to a high frequency power supply 2. When a comparing circuit 15 detects that the light level of the dimming control signal B with respect to the full light becomes higher than or equal to 40% to 60%, the feedback circuit is disconnected by operating a switch 13 provided between an error amplifying circuit 9 and an adder 12 to stop the feedback control.

REFERENCES:
patent: 4870327 (1989-09-01), Jorgensen
patent: 5449981 (1995-09-01), Auld, Jr. et al.

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