DEVICES AND SYSTEMS HAVING AC LED CIRCUITS AND METHODS OF DRIVING THE SAME
First Claim
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1. A lighting system comprising:
- at least one circuit having at least two LEDs, the at least two LEDs electrically connected and configured so that when the LEDs are connected to a power source at least a first LED within the circuit is forward biased by the power source;
a load sensor connected to the at least two LEDs, wherein the load sensor senses the operation of the at least first LED forward biased by the power source; and
,a switching circuit capable of switching the output of the power source to forward bias the at least a second LED if the operation of the at least first LED which is forward biased fails.
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Abstract
A lighting device and system having at least one circuit, the circuit having at least two LEDs connected in series, parallel or anti-parallel configuration and at least one current limiting diode. The device or system may be driven with AC or DC power and may further include a sensor and polarity switching circuit to utilize all LEDs within the circuit when drive by DC power.
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Citations
20 Claims
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1. A lighting system comprising:
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at least one circuit having at least two LEDs, the at least two LEDs electrically connected and configured so that when the LEDs are connected to a power source at least a first LED within the circuit is forward biased by the power source; a load sensor connected to the at least two LEDs, wherein the load sensor senses the operation of the at least first LED forward biased by the power source; and
,a switching circuit capable of switching the output of the power source to forward bias the at least a second LED if the operation of the at least first LED which is forward biased fails. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of driving a lighting device or system, the method comprising the steps of:
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connecting at least two LEDs to a power source such that at least a first LED of the at least two LEDs is forward biased by the power source; sensing operation of the first LED; switching the output of the power source to forward bias at least a second LED of the at least two LEDs is forward biased if it is determined that the first LED is inoperable. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification