Ballast/line detection circuit for fluorescent replacement lamps
First Claim
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1. An electronic circuit for use in a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, comprising:
- a detection circuit configured to connect to the power source and including power converter circuitry, the detection circuit further configured to;
generate a substantially constant voltage at a predetermined point in the detection circuit, wherein a value of the substantially constant voltage varies based on whether the power source is one of an AC line with a ballast and an AC line without the ballast;
compare the substantially constant voltage with a reference voltage;
generate a signal based on the comparison, wherein the signal is indicative of the type of power source; and
provide power to the at least one LED based on the generated signal.
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Abstract
Disclosed herein is a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, the improvement including a detection circuit for connection to the power source, the detection circuit configured to identify the power source.
1000 Citations
16 Claims
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1. An electronic circuit for use in a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, comprising:
a detection circuit configured to connect to the power source and including power converter circuitry, the detection circuit further configured to; generate a substantially constant voltage at a predetermined point in the detection circuit, wherein a value of the substantially constant voltage varies based on whether the power source is one of an AC line with a ballast and an AC line without the ballast; compare the substantially constant voltage with a reference voltage; generate a signal based on the comparison, wherein the signal is indicative of the type of power source; and provide power to the at least one LED based on the generated signal. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic circuit for use in a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, comprising:
a detection circuit for connection to the power source, the detection circuit configured to identify the power source, wherein the detection circuit comprises; a full-wave rectifier electrically coupled to the power source and configured to produce a rectified voltage output; a smoothing filter electrically coupled to the full wave rectifier and configured to produce a smoothed rectified voltage output; a Zener diode and a resistor electrically coupled in parallel to the smoothing filter; and a comparator, wherein one input of the comparator is electrically coupled to a point between the Zener diode the resistor and another input of the comparator is electrically coupled to a reference voltage. - View Dependent Claims (7, 8, 9)
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10. A method of supplying power to a replacement light for a fluorescent tube usable in a fluorescent fixture connected to a power source and containing at least one LED, the replacement light including a detection circuit, comprising:
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connecting the detection circuit to the power source; generating a substantially constant voltage at a predetermined point in the detection circuit, wherein a value of the substantially constant voltage varies based on whether the power source is one of an AC line with a ballast and an AC line without the ballast; comparing the substantially constant voltage with a reference voltage; generating a signal based on the comparison, wherein the signal is indicative of the type of power source; and providing power to the at least one LED based on the generated signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification