LED assembly, LED fixture, control method and software program
First Claim
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1. A light-emitting diode (LED) assembly comprising:
- a plurality of LEDs arranged in groups, each group comprising at least one LED,a control circuit for driving the LEDs, the control circuit comprising a sensing device for sensing an operative parameter of the LEDs, said operative parameter comprising a forward voltage;
the control circuit being arranged to;
a) operate at least two of the groups of the LEDs simultaneously with each other;
b) sense by the sensing device a total value of the operative parameter of the at least two groups;
c) repeat a) and b)for at least a different combination of at least two of the groups;
d) determine the operative parameter for each of the at least two groups from the sensed total values of the operative parameter;
e) assign to each of the groups of LEDs a value of the operative parameter from the determined operative parameter values;
f) estimate a temperature of each of the LED groups based on the assigned value of the operative parameter; and
g) control the driving of the groups of LEDs from the assigned operative parameter values by using the estimated temperature.
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Abstract
A plurality of LEDs arranged in groups, each group comprising at least one LED, a control circuit for driving the LEDs, the control circuit comprising a sensing device for sensing an operative parameter of the LEDs. The control circuit is arranged to: a) operate at least one group of the LEDs: b) sense by the sensing device a value of the operative parameter of the at least one group; c) repeat a) and b) for at least a different one of the groups; d) assign to each of the groups of LEDs a value of the operative parameter from the sensed operative parameter values; and e) control the driving of the groups of LEDs from the assigned operative parameter values.
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Citations
11 Claims
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1. A light-emitting diode (LED) assembly comprising:
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a plurality of LEDs arranged in groups, each group comprising at least one LED, a control circuit for driving the LEDs, the control circuit comprising a sensing device for sensing an operative parameter of the LEDs, said operative parameter comprising a forward voltage; the control circuit being arranged to; a) operate at least two of the groups of the LEDs simultaneously with each other; b) sense by the sensing device a total value of the operative parameter of the at least two groups; c) repeat a) and b)for at least a different combination of at least two of the groups; d) determine the operative parameter for each of the at least two groups from the sensed total values of the operative parameter; e) assign to each of the groups of LEDs a value of the operative parameter from the determined operative parameter values; f) estimate a temperature of each of the LED groups based on the assigned value of the operative parameter; and g) control the driving of the groups of LEDs from the assigned operative parameter values by using the estimated temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a light-emitting diode (LED) assembly comprising a plurality of LEDs arranged in groups, each group comprising at least one LED, the method comprising:
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a) operating at least two of the groups of the LEDs simultaneously with each other; b) sensing by the sensing device a total value of the operative parameter of the at least two groups; c) repeating a), b) for at least a different combination of at least two of the groups; d) determine the operative parameter for each of the at least two groups from the sensed total values of the operative parameter; e)assigning to each of the groups of LEDs the total value of the operative parameter from the determined operative parameter values; f) estimate a temperature of each of the LED groups based on the assigned value of the operative parameter; and g) controlling the driving of the groups of LEDs from the assigned operative parameter values by using the estimated temperature. - View Dependent Claims (10, 11)
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Specification