Systems and methods of applying bleed circuits in LED lamps
First Claim
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1. A method of operating an LED system including an electronic transformer, the method comprising:
- monitoring an output voltage waveform of the transformer;
computing a bleed-on cycle time by initiating a bleed-on timer when the output voltage waveform falls below a predetermined minimum threshold and turning off the bleed-on timer when the output voltage waveform exceeds a predetermined maximum threshold;
computing a bleed-off cycle time by initiating a bleed-off timer when the output voltage waveform exceeds the predetermined maximum threshold and turning off the bleed-off timer when the output voltage waveform falls below the predetermined minimum threshold;
storing the bleed-on cycle time and the bleed-off cycle time in a computer memory;
during a later use of the LED system, when the LED system is turned on, retrieving the bleed-on cycle time and the bleed-off cycle time from the computer memory; and
engaging a bleed circuit to the transformer in accordance with the bleed-on cycle time and disengaging the bleed circuit from the transformer in accordance with the bleed-off cycle time, the bleed circuit being engaged for a duration adequate to ensure a minimum load on the transformer sufficient to avoid cut-off throughout the output voltage waveform.
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Abstract
A bleed circuit is applied to a transformer based on a bleed-on time and a bleed-off time determined by monitoring an output voltage waveform of the transformer.
200 Citations
13 Claims
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1. A method of operating an LED system including an electronic transformer, the method comprising:
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monitoring an output voltage waveform of the transformer; computing a bleed-on cycle time by initiating a bleed-on timer when the output voltage waveform falls below a predetermined minimum threshold and turning off the bleed-on timer when the output voltage waveform exceeds a predetermined maximum threshold; computing a bleed-off cycle time by initiating a bleed-off timer when the output voltage waveform exceeds the predetermined maximum threshold and turning off the bleed-off timer when the output voltage waveform falls below the predetermined minimum threshold; storing the bleed-on cycle time and the bleed-off cycle time in a computer memory; during a later use of the LED system, when the LED system is turned on, retrieving the bleed-on cycle time and the bleed-off cycle time from the computer memory; and engaging a bleed circuit to the transformer in accordance with the bleed-on cycle time and disengaging the bleed circuit from the transformer in accordance with the bleed-off cycle time, the bleed circuit being engaged for a duration adequate to ensure a minimum load on the transformer sufficient to avoid cut-off throughout the output voltage waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for minimizing flicker in a circuit comprising an LED lamp and an electronic transformer, the system comprising:
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a bleed circuit; an analyzer for monitoring an output voltage waveform of the transformer and determining a bleed-on cycle time and a bleed-off cycle time based at least in part on the monitored output voltage waveform; a memory for storing the bleed-on cycle time and the bleed-off cycle time; and control circuitry for (i) retrieving the bleed-on cycle time and the bleed-off cycle time from the computer memory when the LED lamp is turned on and (ii) selectively engaging the bleed circuit to the transformer in accordance with the retrieved cycle times, the bleed circuit ensuring a minimum load on the transformer sufficient to avoid cut-off. - View Dependent Claims (10, 11, 12, 13)
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Specification