Electronic converter, and related lighting system and method of operating an electronic converter

Patent metadata

Field	Value
Publication number	US-9960684-B2
Application number	US-201314038844-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Sep 28, 2012
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An electronic converter may include transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to an input for receiving a power signal, and wherein the secondary winding is coupled to an output including a positive terminal and a negative terminal for providing a power signal. The converter moreover may include an electronic switch arranged between the input and the primary winding, wherein the electronic switch is configured to control the current flow through the primary winding. Specifically, the converter may include a snubber circuit arranged between the secondary winding and the output.

First claim

The invention claimed is:

1. An electronic converter comprising:
an electronic converter input for receiving an input power signal and an electronic converter output comprising a positive terminal and a negative terminal for providing an output power signal,
a transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to the electronic converter input, and wherein the secondary winding is coupled to the electronic converter output,
an electronic switch arranged between the electronic converter input and the primary winding, wherein the electronic switch is configured to control a current flow through the primary winding,
a snubber circuit arranged between the secondary winding and the electronic converter output, wherein the snubber circuit comprises a first and a second diode connected in series and a capacitor connected to an intermediate point between the first diode and the second diode, wherein the cathode of the first diode is directly connected to the positive terminal of the electronic converter output and the anode of the second diode is directly connected to the negative terminal of the electronic converter output; and
wherein the electronic converter is selected from the group consisting of:
a flyback converter comprising a third diode connected between a first terminal of said secondary winding and said positive terminal of said output, and wherein said capacitor of said snubber circuit is connected to said first terminal of said secondary winding,
a forward converter comprising an inductor and a third diode connected in series between a first terminal of said secondary winding and said positive terminal of said output, and wherein said capacitor of said snubber circuit is connected to said first terminal of said secondary winding, or
a ZETA converter comprising a capacitor and an inductor connected in series between a terminal of said secondary winding and a terminal of said output, wherein said capacitor of said snubber circuit is connected to the intermediate point between said capacitor and said inductor; and
wherein the inductor is not disposed between the snubber circuit and the electronic converter output.

2. The electronic converter according to claim 1 , wherein an amount of a capacitance for the electronic switch is substantially similar to an amount of the capacitance for the snubber circuit.

3. The electronic converter according to claim 1 , comprising a further circuit connected in parallel with said electronic switch, wherein said further circuit comprises a diode and a capacitor connected in series, and a resistor connected in parallel with said diode of said further circuit.

Assignees

• Osram Gmbh

Inventors

• Luccato Daniele

Classifications

• H02M1/34

  Snubber circuits · CPC title

• H02M3/335

  using semiconductor devices only · CPC title

• H02M3/33507 Primary

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• Y02B70/1491

  Cross-Sectional Technologies · mapped topic

• H05B33/0815

  Electricity · mapped topic