Current supply for luminescent diodes
First Claim
1. A current supply circuitry for at least one luminescent diode supplied with a.c. current via a current supply mains, having:
- at least one inductive reactance connected as storage choke in series to the luminescent diode, switching stages for switching over between the charging or discharging process occurring in the storage choke upon over-shooting or under-shooting of threshold values of their respective control voltages and a free running current path, connected parallel to the series connection of the luminescent diodes and the storage choke, for at least a part of the discharge current released by the storage choke to the luminescent diodes upon blocking of the first switching stage.
7 Assignments
0 Petitions
Accused Products
Abstract
The present invention is based on a regulation circuit (200a, 200b) 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 (ID) varying periodically around a d.c. current value. With this method it is afforded by means of a circuitry provision that both the charging and also the discharging current (IL1) of an inductive reactance (XL1) connected in series to the luminescent diodes (D1, . . . ,DN), functioning as a storage choke (L1) for filtering of mains harmonics, flows as diode current (ID) through the luminescent diodes (D1, . . . ,DN). The advantage of this method consists in a significant reduction of the overall power loss (PV, ges) of the LED illumination module (100). According to one exemplary embodiment of the invention the ceramic circuit board (102) of the LED illumination module (100) in accordance with the invention has a direct mains current supply (104, 108), which for protection from mechanical damage is accommodated in a transparent housing (106) having a highly transparent polymer mass (110) serving as optically active lens surface.
29 Citations
24 Claims
-
1. A current supply circuitry for at least one luminescent diode supplied with a.c. current via a current supply mains, having:
-
at least one inductive reactance connected as storage choke in series to the luminescent diode, switching stages for switching over between the charging or discharging process occurring in the storage choke upon over-shooting or under-shooting of threshold values of their respective control voltages and a free running current path, connected parallel to the series connection of the luminescent diodes and the storage choke, for at least a part of the discharge current released by the storage choke to the luminescent diodes upon blocking of the first switching stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for regulated current supply of at least one luminescent diode supplied with a.c. current via a current supply mains,
wherein a transformer is used for the generation of an a.c. current varying periodically about a settable d.c. current value, flowing through the luminescent diodes.
-
14. A LED module, comprising an arrangement of series connected light-emitting diodes, which are applied on a thermally conducting ceramic circuit board with direct mains current supply and are fed via a current supply mains with a.c. current, wherein
the LED illumination module is, for protection from mechanical damage, accommodated in a transparent housing, having a highly transparent polymer mass, serving as optically active lens surface, and has a regulation circuit for providing a constant current supply, and the light emitting p- and n-doped layers of the luminescent diodes are applied to the said circuit board in a Chip-On-Board technology.
Specification