Lighting Device Having Phototransistor with On/Off Control Circuitry
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United States of America Patent
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Issued Date -
Aug 29, 2013
app pub date -
Feb 21, 2013
filing date -
Feb 24, 2012
priority date (Note) -
Abandoned
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Abstract
A lighting device, such as nightlight or path light is provided. The lighting device includes a power supply input, a light source, and a phototransistor for sensing ambient light. The lighting device also includes control circuitry for turning the light source on and off based on the sensed ambient light. The control circuitry includes a first resistor in series with the phototransistor and a second resistor in parallel with the phototransistor. The first resistor sets an illumination limit to turn the light source on and off and the second resistor introduces hysteresis such that the light source is turned on and off at different illumination limits. A path light may further include a motion sensor for sensing motion of an object and turns the light source on when both motion is detected and the sensed light is below an illumination level.
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