초록 ▼

In a “two-wire”multiplexed lighting system, a square wave voltage alternating between positive and negative polarities is delivered by the two wires to both right and left lamps. Each lamp includes a diode, and the diodes are oppositely pulled with respect to each other so that one of the lamps is e

In a “two-wire”multiplexed lighting system, a square wave voltage alternating between positive and negative polarities is delivered by the two wires to both right and left lamps. Each lamp includes a diode, and the diodes are oppositely pulled with respect to each other so that one of the lamps is energized by one polarity of the square wave while the other lamp is energized by the opposite polarity. The magnitude of each polarity relative to ground is twice the continuous D.C. voltage rating of each lamp so that the average voltage applied to each lamp can be equal to the load\s maximum continuous rating to thereby provide full intensity illumination. The lamps provide different signaling functions, such as turn signal, emergency warning, brake lamp and running lamp signals by the operation of corresponding command switches acting through a control logic circuit, including multiplexing, configured to assign a priority to the commands such that the highest priority command will override any others and produce the corresponding operation of a lamps. In the “three-wire”embodiment of a multiplexed vehicle lighting system, the two lamps have a common ground but each is supplied by its own individual wire. The control circuit further includes a novel circuit for performing the marker lamp function that is commonly used in large trucks and highway tractors.

대표청구항 ▼

In an automotive vehicle signal lamp system which comprises respective right and left signal lamp loads of given continuous D.C. voltage and illumination ratings on respective right and left sides of a vehicle for providing visible signals on the right and left sides of a vehicle, a D.C. power suppl

In an automotive vehicle signal lamp system which comprises respective right and left signal lamp loads of given continuous D.C. voltage and illumination ratings on respective right and left sides of a vehicle for providing visible signals on the right and left sides of a vehicle, a D.C. power supply for energizing said lamp loads, and circuit means operatively coupling said D.C. power supply with said lamp loads, said circuit means including switch means for selectively energizing said lamp loads from said D.C. power supply to produce said signals, the improvement which comprises said power supply comprising means providing a lamp-load-energizing D.C. voltage the magnitude of which is essentially twice the given continuous D.C. voltage rating of said lamp loads, and said circuit means comprising means for operating said switch means to cause said lamp-load-energizing D.C. voltage to be duty-cycle applied to said lamp loads in such a manner that the time average value of voltage which is applied to said lamp loads is substantially the same as the given continuous D.C. voltage rating of said lamp loads and said lamp loads are caused to emit substantially their rated illumination without any perceptible flickering.