Method and device for measuring a lighting level and twilight switch comprising same

摘要

The device has a photodiode (P) that is arranged parallel to a switched capacitor (C) on a light sensor (1). The photodiode is operated in the reverse direction. A charging circuit charges the capacitor with a voltage source. The current sources discharge the current to capacitor. A time measuring unit measures the discharging times of capacitor. Independent claims are included for the following: (1) method for determining luminance of light in twilight switch; and (2) twilight switch.