US 10,368,407 B2
Electronic converter and related lighting system
Daniele Luccato, Vittorio Veneto (IT)
Assigned to OSRAM GMBH, Munich (DE)
Filed by Osram GmbH, Munich (DE)
Filed on May 4, 2018, as Appl. No. 15/970,947.
Claims priority of application No. 102017000048409 (IT), filed on May 4, 2017.
Prior Publication US 2018/0324915 A1, Nov. 8, 2018
Int. Cl. H05B 33/08 (2006.01); H05B 37/02 (2006.01); H02M 3/335 (2006.01)
CPC H05B 33/0818 (2013.01) [H02M 3/33523 (2013.01); H02M 3/33553 (2013.01); H05B 33/0845 (2013.01); H05B 33/0857 (2013.01); H05B 37/0218 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electronic converter comprising:
two input terminals for receiving an input voltage;
two output terminals for providing a DC voltage or a DC current;
a transformer comprising a primary winding and a secondary winding;
a switching stage configured to selectively transfer energy from said two input terminals to said primary winding of said transformer;
a rectification and filter circuit connected between said secondary winding of said transformer and said two output terminals;
a measurement circuit configured to determine a first signal indicative of said DC voltage or said DC current provided via said output terminals;
a regulation circuit configured to generate a regulation signal as a function of said first signal and one or more reference signals;
a driver circuit configured to drive said switching stage as a function of said regulation signal;
wherein the electronic converter comprises:
an optical, inductive or capacitive coupler;
a transmission circuit configured to:
a) receive said first signal and a second signal,
b) generate a bit sequence indicative of said second signal,
c) generate an encoded bit sequence by applying a Manchester coding to said bit sequence,
d) generate a pulse width modulated signal applied to the input of said optical, inductive or capacitive coupler, wherein said pulse width modulated signal comprises for each bit of said encoded bit sequence:
a sequence of a first number of pulses with a first frequency when the respective bit has a first logic value, and
a sequence of a second number of pulses with a second frequency when the respective bit has a second logic value,
e) vary the duty cycle of said pulse width modulated signal as a function of said first signal, and
a receiver circuit configured to monitor the received signal at the output of said optical, inductive or capacitive coupler, and determine a third signal indicative of said first signal and a fourth signal indicative of said second signal.