Circuit for vehicle lighting
First Claim
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1. A circuit for driving a vehicle lamp, comprising:
- a current path coupled between a power line and ground and comprising a dummy load; and
a monitoring unit coupled to said power line and operable for monitoring a testing signal applied to said power line, wherein said testing signal is operable for testing whether said vehicle lamp operates properly, and wherein said monitoring unit is operable for conducting said current path to enable a current to flow through said dummy load to ground to decrease a total resistance of said circuit if said testing signal is detected.
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Abstract
A circuit for driving a vehicle lamp includes a current path coupled between a power line and ground, and a monitoring unit coupled to the power line. The current path includes a dummy load. The monitoring unit can monitor a testing signal applied to the power line. The testing signal can test whether the vehicle lamp operates properly. The monitoring unit can conduct the current path to enable a current to flow through the dummy load to ground to decrease a total resistance of the circuit if the testing signal is detected.
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Citations
21 Claims
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1. A circuit for driving a vehicle lamp, comprising:
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a current path coupled between a power line and ground and comprising a dummy load; and a monitoring unit coupled to said power line and operable for monitoring a testing signal applied to said power line, wherein said testing signal is operable for testing whether said vehicle lamp operates properly, and wherein said monitoring unit is operable for conducting said current path to enable a current to flow through said dummy load to ground to decrease a total resistance of said circuit if said testing signal is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light assembly, comprising:
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a light source; and a circuit coupled to a power line for driving said light source, comprising; a first capacitor coupled to said power line, wherein a voltage across said first capacitor increases above a threshold if a testing signal for testing whether said light source operates properly is applied to said power line; a current path coupled between said power line and ground, wherein said current path is conducted to decrease a total resistance of said circuit if said voltage across said first capacitor is above said threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for driving a vehicle lamp by a circuit, comprising:
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monitoring a testing signal on a power line, wherein said testing signal tests whether said vehicle lamp operates properly; conducting a current path between said power line and ground to decrease a total resistance of said circuit if said testing signal is detected; and cutting off said current path if said testing signal is absent. - View Dependent Claims (18, 19, 20, 21)
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Specification