Patent ID: 9386672
Filing Date: 2016-07-05
CPC Classification: H05B

Claim Text:
1. A method of running up a discharge lamp by controlling a driving power to a target value during a single or during two or more consecutive time periods, wherein an instantaneous output power is calculated based on an estimate of the discharge lamp voltage, the driving power of the lamp being controlled to reach the power target value during the single or during a last period of said two or more consecutive time periods, wherein a driving current of the lamp is not allowed during the single or second time period to increase faster than a preset rate and to exceed a fixed upper current limit; and wherein an adaptive upper current limit is set which the driving current is not allowed to exceed, the adaptive upper limit being increased by a first present amount every time when the current requested exceeds the adaptive upper limit, and being lowered by a second present amount every time when the driving current decreases.