System And Method For Controlling A Matrix Of Light Emitting Diodes And Light Provided Therewith
First Claim
1. A system for controlling a matrix of light emitting diodes (LED) connected to an input line, the system comprising:
- a power converter for connecting to the matrix of LEDs and to the input line therebetween and for receiving from said input line an input current and an input voltage characterized by a shape and a frequency and for providing a direct current (D.C.) output for powering up the LEDs, yielding an operating current through the LEDs;
said power converter including a first current sensor for sensing said input current and a second current sensor for sensing said operating current;
a controller for connecting to both the input line and to said power converter;
said controller including a voltage sensor for sensing said input voltage and a pre-regulator i) for receiving said operating current, said input current and said input voltage, ii) for biasing said operating current towards a target current value, and iii) for regulating said power converter to cause said input current to follow said shape and frequency of said input voltage, yielding a unity power factor and minimizing harmonic distortion of said input current.
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Abstract
A system and method for controlling a matrix of light emitting diodes (LED) connected to an input line comprises a power converter for connecting to the matrix of LEDs and to the input line therebetween and for receiving from the input line an input current and an input voltage characterized by a shape and a frequency and for providing a direct current (D.C.) output for powering up the LEDs, yielding an operating current through the LEDs. The power converter includes a first current sensor for sensing the input current and a second current sensor for sensing the operating current. The system further comprises a controller for connecting to both the input line and to the power converter. The controller includes a voltage sensor for sensing the input voltage and a pre-regulator i) for receiving the operating current, the input current and the input voltage, ii) for biasing the operating current towards a target current value, and iii) for regulating the power converter to cause the input current to follow the shape and frequency of the input voltage, yielding a unity power factor and minimizing the input current harmonic distortion. The present method and system allows maximizing the energy savings, controlling current flowing in the diodes so as to obtain the maximum flux of light with the minimum energy and also allows meeting all safety, EMI, reliability and robustness requirements.
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Citations
24 Claims
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1. A system for controlling a matrix of light emitting diodes (LED) connected to an input line, the system comprising:
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a power converter for connecting to the matrix of LEDs and to the input line therebetween and for receiving from said input line an input current and an input voltage characterized by a shape and a frequency and for providing a direct current (D.C.) output for powering up the LEDs, yielding an operating current through the LEDs;
said power converter including a first current sensor for sensing said input current and a second current sensor for sensing said operating current;a controller for connecting to both the input line and to said power converter;
said controller including a voltage sensor for sensing said input voltage and a pre-regulator i) for receiving said operating current, said input current and said input voltage, ii) for biasing said operating current towards a target current value, and iii) for regulating said power converter to cause said input current to follow said shape and frequency of said input voltage, yielding a unity power factor and minimizing harmonic distortion of said input current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for controlling a matrix of light emitting diodes (LED) connected to an input line, the system comprising:
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converter means for connecting to the matrix of LEDs and to the input line therebetween and for receiving from said input line an input current and an input voltage characterized by a shape and a frequency and for providing a direct current (D.C.) output for powering up the LEDs, yielding an operating current through the LEDs; first sensing means for sensing said input current; second sensing means for sensing said operating current; third sensing means for sensing said input voltage; and controller means for connecting to both the input line and to said converter means i) for receiving said operating current, said input current and said input voltage, ii) for biasing said operating current towards a target current, and iii) for regulating said converter means to cause said input current to follow said shape and frequency of said input voltage, yielding a unity power factor and minimizing said input current harmonic distortion.
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22. A method for controlling a matrix of light emitting diodes (LED) connected to an input line, the method comprising:
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sensing from said input line an input current; sensing from said input line an input voltage characterized by a shape and a frequency; providing a LED target current operating value; converting said input line voltage into a direct current (D.C.) output voltage for powering up the LEDs, yielding an operating current through the LEDs, by forcing said input current to follow said shape and frequency of said input voltage, yielding a unity power factor and minimizing harmonic distortion of said input current; sensing an operating current through said LEDs; and biasing said operating current towards said LED target current operating value. - View Dependent Claims (23, 24)
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Specification