LED lamp with half wave dimming
First Claim
Patent Images
1. An LED lamp assembly, the assembly comprising:
- a power supply configured to receive an input power signal and provide a DC lamp current;
a dimming controller coupled to the power supply and configured to adjust the DC lamp current; and
an LED lamp coupled to the DC lamp current,wherein the dimming controller is configured to determine if full brightness or dimmed brightness is required based at least in part on the input power signal, and to maintain the DC lamp current at a first amount when full brightness is required and to maintain the DC lamp current at a second amount when dimmed brightness is required by;
determining whether the input power signal contains a half-wave signal;
measuring a zero-level duration of the input power signal; and
maintaining the LED lamp current at the first amount when the zero-level duration is not greater than a predetermined threshold time or the input power signal does not contain a half-wave signal;
ormaintaining the LED lamp current at the second amount when the zero-level duration is greater than the predetermined threshold time and the input power signal contains a half-wave signal.
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Abstract
An LED lamp assembly includes a power supply configured to receive an input power signal and provide a DC lamp current, a dimming controller coupled to the power supply and configured to adjust the DC lamp current, and an LED lamp coupled to the DC lamp current. The dimming controller is configured to determine if full brightness or dimmed brightness is required based at least in part on the input power signal. The DC lamp current is maintained at a first level when full brightness is required and at a second level when dimmed brightness is required.
25 Citations
14 Claims
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1. An LED lamp assembly, the assembly comprising:
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a power supply configured to receive an input power signal and provide a DC lamp current; a dimming controller coupled to the power supply and configured to adjust the DC lamp current; and an LED lamp coupled to the DC lamp current, wherein the dimming controller is configured to determine if full brightness or dimmed brightness is required based at least in part on the input power signal, and to maintain the DC lamp current at a first amount when full brightness is required and to maintain the DC lamp current at a second amount when dimmed brightness is required by; determining whether the input power signal contains a half-wave signal; measuring a zero-level duration of the input power signal; and maintaining the LED lamp current at the first amount when the zero-level duration is not greater than a predetermined threshold time or the input power signal does not contain a half-wave signal;
ormaintaining the LED lamp current at the second amount when the zero-level duration is greater than the predetermined threshold time and the input power signal contains a half-wave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling the brightness of an LED lamp, the method comprising:
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sampling an input power signal; determining whether the input power signal contains a half-wave signal; measuring a zero-level duration of the input power signal; comparing the zero-level duration to a predetermined threshold duration value; and maintaining the LED lamp at a full brightness if the zero-level duration is not greater than the threshold duration time or the input power signal does not contain a half-wave signal. - View Dependent Claims (10, 11, 12)
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13. A method of retrofitting traffic control signals that contain incandescent signal lamps with dimmable energy saving LED signal lamps, the method comprising:
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providing a dimmable LED lamp assembly wherein the dimmable LED lamp assembly is configured to produce a full brightness when a full-wave power signal is applied and to produce a dimmed brightness when a half-wave rectified power signal is applied; packaging the dimmable LED lamp assembly such that it is physically and electrically compatible with the incandescent signal lamps; and replacing each incandescent signal lamp with the packaged dimmable LED lamp assembly. - View Dependent Claims (14)
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Specification