POWER SUPPLY UNIT FOR LIGHT-EMITTING DIODES

摘要

The invention relates to a control circuit (200a, 200b) for supplying constant power based on a transformer method in which a triangular alternating current (ID) that periodically varies by a DC value flows through light-emitting diodes (D1,..., DN). According to said method, a circuit-related measure is used such that both the charging current and the discharging current (IL1) of an inductive reactance (XL1) which acts as a storage inductor (L1) and is serially connected to the light-emitting diodes (D1,..., DN) flow through the light-emitting diodes (D1, , DN) as diode current (ID) in order to filter network harmonics. Said method has the advantage of substantially reducing the total power loss (PV, ges) of the LED lighting module (100). In one embodiment of the invention, the ceramic printed board (102) of the inventive LED lighting module (100) is provided with a direct line current supply unit (104, 108) which is mounted in a transparent housing (106) in order to be protected from mechanical damage, said transparent housing (106) comprising a highly transparent polymer material (110) that is used as an optically active lens area.