Current supply for luminescent diodes
First Claim
1. A LED module, comprising an arrangement of light-emitting luminescent diodes connected in series, which are applied on a thermally conducting ceramic circuit board with a direct mains current supply and are fed with AC current, whereinthe LED module is, for protection from mechanical damage, enclosed between a transparent housing and the circuit board, the transparent housing having a highly transparent polymer mass disposed therein, serving as an optically active lens surface, and has a regulation circuit for providing a constant current supply, and light-emitting p- and n-doped layers of the luminescent diodes are applied to the circuit board using a Chip-On-Board technology, wherein Fresnel lenses that include a lens plate for attainment of a bundled homogenous light distribution in a region of main emission directions are positioned centrally above each luminescent diode within the transparent housing.
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Abstract
The present invention is based on a regulation circuit for making available a constant current supply on the basis of a transformer principle, in which there flows through the luminescent diodes (D1, . . . , DN) a triangular a.c. current varying periodically around a DC current value. Both a charging and a discharging current of inductive reactance connected in series to the luminescent diodes (D 1, . . . , DN), functioning as a storage choke for filtering of mains harmonics, flows as diode current through the luminescent diodes (D 1, . . . , DN). According to one exemplary embodiment of the invention the ceramic circuit board of the LED illumination module in accordance with the invention has a direct mains current supply, which for protection from mechanical damage is accommodated in a transparent housing having a highly transparent polymer mass serving as optically active lens surface.
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Citations
9 Claims
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1. A LED module, comprising an arrangement of light-emitting luminescent diodes connected in series, which are applied on a thermally conducting ceramic circuit board with a direct mains current supply and are fed with AC current, wherein
the LED module is, for protection from mechanical damage, enclosed between a transparent housing and the circuit board, the transparent housing having a highly transparent polymer mass disposed therein, serving as an optically active lens surface, and has a regulation circuit for providing a constant current supply, and light-emitting p- and n-doped layers of the luminescent diodes are applied to the circuit board using a Chip-On-Board technology, wherein Fresnel lenses that include a lens plate for attainment of a bundled homogenous light distribution in a region of main emission directions are positioned centrally above each luminescent diode within the transparent housing.
Specification