Current supply for luminescent diodes
First Claim
1. Current supply circuitry for at least one luminescent diode having:
- at least one inductive reactance connected as a storage choke in series with the luminescent diode(s);
switching stages for switching over from a charging process to a discharging process in the storage choke when an over-shooting of a threshold value of a first control voltage of the switching stages occurs, and for switching over from a discharging process to a charging process in the storage choke when an under-shooting of a threshold value of a second control voltage of the switching stages occurs; and
a free running current path, connected in parallel with the series connection of the luminescent diode(s) and the storage choke, for at least a part of the discharge current released by the storage choke to the luminescent diode(s) upon blocking of the first switching stage.
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Accused Products
Abstract
A regulation circuit is provided for making available a constant current supply on the basis of a transformer principle, in which there flows through the luminescent diodes a triangular a.c. current varying periodically around a d.c. current value. Circuitry is provided so that both the charging and the discharging current of an inductive reactance connected in series to the luminescent diodes, functioning as a storage choke for filtering of mains harmonics, flows as diode current through the luminescent diodes. An advantage of this method consists in a significant reduction of the overall power loss of the LED illumination module. According to one embodiment, the ceramic circuit board of the LED illumination module 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 an optically active lens surface.
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Citations
22 Claims
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1. Current supply circuitry for at least one luminescent diode having:
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at least one inductive reactance connected as a storage choke in series with the luminescent diode(s); switching stages for switching over from a charging process to a discharging process in the storage choke when an over-shooting of a threshold value of a first control voltage of the switching stages occurs, and for switching over from a discharging process to a charging process in the storage choke when an under-shooting of a threshold value of a second control voltage of the switching stages occurs; and a free running current path, connected in parallel with the series connection of the luminescent diode(s) and the storage choke, for at least a part of the discharge current released by the storage choke to the luminescent diode(s) upon blocking of the first switching stage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for regulating a current supply of at least one luminescent diode comprising:
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charging and discharging current of an inductive reactance connected in series to the luminescent diode(s) as a storage choke, wherein responsive to charging and discharging, current flows as diode current through the luminescent diode(s) and is used for the generation of an alternating current varying periodically about a settable direct current value; switching over from a charging process to a discharging process in the storage choke when an over-shooting of a threshold value of a first control voltage of the switching stages occurs, and for switching over from a discharging process to a charging process in the storage choke when an under-shooting of a threshold value of a second control voltage of the switching stages occurs; and releasing at least a part of the discharge current by the storage choke to the luminescent diode(s) upon blocking of the switching stages. - View Dependent Claims (9)
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10. A light-emitting diode module, comprising:
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a plurality of series connected light-emitting diodes applied on a circuit board; and a regulation circuit for providing a constant current supply, wherein the regulation circuit comprises; at least one inductive reactance connected as a storage choke in series with the light-emitting diodes, switching stages for switching over from a charging process to a discharging process in the storage choke when an over-shooting of a threshold value of a first control voltage of the switching stages occurs, and for switching over from a discharging process to a charging process in the storage choke when an under-shooting of a threshold value of a second control voltage of the switching stages occurs, and a free running current path, connected in parallel to the series connection of the light-emitting diodes and the storage choke, for at least a part of the discharge current released by the storage choke to the light-emitting diodes upon blocking of the first switching stage. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification