US Patent No. 10,542,612

DEVICE AND METHOD FOR PROVIDING POWER TO GAS DISCHARGE LAMP


Patent No. 10,542,612
Issue Date January 21, 2020
Title Device And Method For Providing Power To Gas Discharge Lamp
Inventorship Anatoli Saveliev, Zeitlarn (DE)
Sven Probst, Aachen (DE)
Assignee LUMILEDS LLC, San Jose, CA (US)

Claim of US Patent No. 10,542,612

1. A device for providing an amount of power to a gas discharge lamp, the device comprising:a control circuit for controlling a supply circuit for supplying the power to the gas discharge lamp, the control circuit configured to:
from a cold start of the gas discharge lamp, supply a maximum current to the gas discharge lamp;
when the power to the gas discharge lamp reaches a maximum amount of power, supply a decreasing current to maintain the power to the gas discharge lamp at the maximum amount of power;
at a predefined time interval after the cold start of the gas discharge lamp, measure a non-steady state voltage value of a voltage signal across the gas discharge lamp;
calculate a boundary voltage value as a function of the measured, non-steady-state voltage value of the voltage signal; and
when the voltage signal reaches the boundary voltage value, supply an even more decreasing current to decrease the power to the gas discharge lamp.