Lamp driver circuit with controlled power over a range of power

Details Lamp driver circuit with controlled power over a range of power Lamp driver circuit with controlled power over a range of power

1988-12-07

1989-07-18

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 323908, G05F 1565

Patent

active

048496839

ABSTRACT:
A lamp driver circuit for supplying and controlling power to a lamp from a power supply subject to voltage variations. A semiconductor switch is disposed in series with the lamp and a current sensing resistor. A capacitor integrates the lamp current during ON time of the switch and power supply voltage during OFF time. A voltage comparator with hysteresis responds to the capacitor voltage to control the conductive state of the switch. Above a nominal supply voltage, the driver circuit begins to pulse width modulate the power supplied to the lamp with a duty cycle inversely proportional to the square of the supply voltage to maintain constant power to the lamp. As the supply voltage rises above a second predetermined level, the driver circuit ceases to supply power.

REFERENCES:
patent: 3579090 (1971-05-01), Madsen
patent: 4048665 (1977-09-01), Lia et al.
patent: 4513241 (1985-04-01), Bowman

Affiliated with

Also associated with

Rating

Lamp driver circuit with controlled power over a range of power does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lamp driver circuit with controlled power over a range of power , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lamp driver circuit with controlled power over a range of power will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-174632