LED lamp driver identification
First Claim
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1. A system for detecting whether a transformer used in an AC power supply is magnetic or electronic, the system comprising:
- a circuit for modifying an output voltage of the AC power supply and for monitoring a negative half or a positive half of the modified output voltage; and
an analyzer for (i) determining whether half-cycles of approximately zero voltage of a signal or a signal envelope are present in either the negative half or the positive half of the monitored output voltage and (ii) determining that the AC power supply comprises a magnetic-transformer power supply if half-cycles of approximately zero voltage of a signal are present in the monitored output voltage or determining that the AC power supply comprises an electronic-transformer power supply if half-cycles of approximately zero voltage of a signal envelope are absent in the monitored output voltage.
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Abstract
The type of an LED power driver (i.e., a magnetic transformer or an electronic transformer) is determined by manipulating the AC voltage produced by the power driver so that it may be analyzed and the type of power driver reliably determined. In various embodiments, a system for detecting an AC power supply type includes a circuit for monitoring a negative half or a positive half of an output voltage of the AC power supply and an analyzer for determining the AC power supply type based at least in part on a presence or absence of an envelope in the monitored output voltage.
17 Citations
20 Claims
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1. A system for detecting whether a transformer used in an AC power supply is magnetic or electronic, the system comprising:
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a circuit for modifying an output voltage of the AC power supply and for monitoring a negative half or a positive half of the modified output voltage; and an analyzer for (i) determining whether half-cycles of approximately zero voltage of a signal or a signal envelope are present in either the negative half or the positive half of the monitored output voltage and (ii) determining that the AC power supply comprises a magnetic-transformer power supply if half-cycles of approximately zero voltage of a signal are present in the monitored output voltage or determining that the AC power supply comprises an electronic-transformer power supply if half-cycles of approximately zero voltage of a signal envelope are absent in the monitored output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting whether a transformer used in an AC power supply is magnetic or electronic, the method comprising:
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modifying an output voltage of the AC power supply, monitoring a negative half or a positive half of the modified output voltage of the power supply; determining whether half-cycles of substantially zero voltage of a signal or a signal envelope are present in either the negative half or the positive half of the monitored output voltage; and determining that the AC power supply comprises a magnetic-transformer power supply if half-cycles of substantially zero voltage of a signal are present in the monitored output voltage or determining that the AC power supply type comprises an electronic-transformer power supply if half-cycles of substantially zero voltage of a signal envelope are absent in the monitored output voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification