Non-PWM vehicle lamp dimming arrangement
First Claim
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1. A method for selectively controlling a level of illumination for an interior light in a vehicle, the method comprising:
- supplying a current to at least one interior light source to produce a predetermined level of illumination;
detecting existence of a nighttime condition; and
reducing the current to the at least one interior light source using a shunt circuit whenever the nighttime condition is detected to produce a reduced level of illumination.
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Abstract
This invention provides an arrangement for selectively varying the illumination level of an interior light source in a vehicle. The arrangement includes supplying a current to at least one interior light source to achieve a predetermined level of illumination, and reducing the level of illumination via a shunt arrangement in response to detection of a nighttime condition.
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Citations
5 Claims
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1. A method for selectively controlling a level of illumination for an interior light in a vehicle, the method comprising:
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supplying a current to at least one interior light source to produce a predetermined level of illumination; detecting existence of a nighttime condition; and reducing the current to the at least one interior light source using a shunt circuit whenever the nighttime condition is detected to produce a reduced level of illumination. - View Dependent Claims (2)
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3. A system for selectively varying an illumination level of an interior light of a vehicle, the system comprising:
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a current source; at least one interior light source coupled to the current source and receiving a current supplied by the current source to produce a predetermined level of illumination; and a nighttime determination controller coupled to the at least one interior light source and arranged to detect existence of a nighttime condition, where the nighttime determination controller reduces the current supplied to the at least one interior light source using a shunt circuit whenever the nighttime condition is detected to produce a reduced level of illumination. - View Dependent Claims (4, 5)
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Specification