US 10,172,198 B2
Lighting system, related electronic converter and method of designing a lighting system
Paolo De Anna, Vallà di Riese Pio X (IT); Francesco Angelin, Mogliano Veneto (IT); Valerio Michielan, Mogliano Veneto (IT); and Enrico Raniero, Codiverno di Vigonza (IT)
Assigned to OSRAM GMBH, Munich (DE)
Filed by OSRAM GmbH, Munich (DE)
Filed on Mar. 15, 2018, as Appl. No. 15/921,785.
Claims priority of application No. 102017000029057 (IT), filed on Mar. 16, 2017.
Prior Publication US 2018/0270924 A1, Sep. 20, 2018
Int. Cl. H05B 33/08 (2006.01); H05B 37/02 (2006.01); F21S 4/10 (2016.01)
CPC H05B 33/0815 (2013.01) [H05B 37/02 (2013.01); F21S 4/10 (2016.01)] 9 Claims
OG exemplary drawing
 
1. A lighting system comprising: an electronic converter comprising: two input terminals configured to receive an input voltage, a positive output terminal and a negative output terminal for providing a continuous output voltage, a transformer comprising a primary winding and a secondary winding, wherein a capacitor is connected between said primary winding and said secondary winding, wherein said primary winding is coupled to said two input terminals, a rectifier circuit, wherein the input of said rectifier circuit is connected to said secondary winding of said transformer, and an output filter circuit, wherein the input of said output filter circuit is connected to the output of said rectifier circuit, wherein the output of said output filter circuit provides said continuous output voltage; a lighting module comprising a positive input terminal and a negative input terminal, and a string of LEDs or laser diodes and a current regulator connected directly in series between said positive input terminal and said negative input terminal of said lighting module, wherein said string of LEDs or laser diodes is configured to be mounted on a substrate in a metallic material, whereby a parasitic capacitance is arranged between the lighting module and said substrate in a metallic material; and a switching stage comprising: a positive input terminal and a negative input terminal connected directly to the positive and negative output terminals of said electronic converter, and a positive output terminal and a negative output terminal connected directly to the positive and negative input terminals of said lighting module, wherein said positive input terminal is connected directly to said positive output terminal; a field effect transistor, wherein the drain of said transistor is connected directly to said negative output terminal and the source of said transistor is connected directly to said negative input terminal, a control unit configured to drive the gate of said transistor as a function of a dimming signal, and a diode, wherein the anode of said diode is connected directly to the negative output terminal of said switching stage and the cathode of said diode is connected directly to the positive output terminal of said switching stage.