Method and apparatus for controlling a lighting module based on a constant current level from a power source
First Claim
1. A lighting apparatus comprising:
- a power source operable to generate an output voltage across first and second output nodes to maintain a constant current level flowing between the first and second output nodes when a load is coupled;
a lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series;
a control apparatus coupled between the power source and the lighting module, the control apparatus operable;
to determine a first indication of the constant current level flowing between the first and second output nodes of the power source;
to determine a first activation ratio in which to activate the first and second groups of LEDs each cycle period based upon the first indication of the constant current level; and
to selectively couple the first and second groups of LEDs in series between the first and second output nodes of the power source each cycle period based upon the first activation ratio.
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Accused Products
Abstract
Method and control apparatus for controlling a lighting module based on a constant current level from a power source are disclosed. The control apparatus may be operable: to determine an indication of a constant current level of the power source; to determine an activation ratio in which to activate first and second groups of LEDs each cycle period based upon the indication of the constant current level; and to selectively couple the first and second groups of LEDs to the power source each cycle period based upon the first activation ratio. The first and second groups of LEDs may comprise LEDs of first and second color temperatures respectively. The control apparatus can be adapted to operate as a dim-to-warm module within a lighting apparatus.
188 Citations
20 Claims
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1. A lighting apparatus comprising:
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a power source operable to generate an output voltage across first and second output nodes to maintain a constant current level flowing between the first and second output nodes when a load is coupled; a lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series; a control apparatus coupled between the power source and the lighting module, the control apparatus operable;
to determine a first indication of the constant current level flowing between the first and second output nodes of the power source;
to determine a first activation ratio in which to activate the first and second groups of LEDs each cycle period based upon the first indication of the constant current level; and
to selectively couple the first and second groups of LEDs in series between the first and second output nodes of the power source each cycle period based upon the first activation ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control apparatus adapted to be coupled between a power source and a lighting module, the power source operable to generate a voltage across first and second output nodes to maintain a constant current level flowing between the first and second output nodes when a load is coupled;
- the lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series;
the control apparatus comprising;a controller operable to determine a first indication of the constant current level flowing between the first and second output nodes of the power source;
to determine a first activation ratio in which to activate the first and second groups of LEDs each cycle period based upon the first indication of the constant current level; and
to selectively couple the first and second groups of LEDs in series between the first and second output nodes of the power source each cycle period based upon the first activation ratio. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- the lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series;
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17. A method for emitting a particular color temperature light from a lighting apparatus, the lighting apparatus comprising a power source operable to generate a voltage across first and second output nodes to maintain a constant current level flowing between the first and second output nodes when a load is coupled;
- and a lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series;
the method comprising;determining a first indication of the constant current level flowing between the first and second output nodes of the power source; determining a first activation ratio in which to activate the first and second groups of LEDs each cycle period based upon the first indication of the constant current level; and selectively coupling the first and second groups of LEDs in series between the first and second output nodes each cycle period based upon the first activation ratio. - View Dependent Claims (18, 19, 20)
- and a lighting module comprising a first group of LEDs comprising one or more first LEDs coupled in series and a second group of LEDs comprising one or more second LEDs coupled in series;
Specification