Module Having Measurement Signal Feedback Via A Galvanically Isolated Converter

Patent metadata

Field	Value
Publication number	US-2016105121-A1
Application number	US-201414785891-A
Country	US
Kind code	A1
Filing date	Apr 25, 2014
Priority date	Apr 26, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

The invention relates to a module for operating at least one illuminant, preferably at least one LED, said module having at least one electrically insulating barrier, which separates a primary side that can be supplied, originating from a mains voltage, from a secondary side of the module, from which the at least one illuminant can preferably be supplied. A secondary-side passive circuit is provided, which is connected in a supply path to a primary-side control circuit across the barrier via a galvanically isolated converter. The primary-side control circuit is designed to apply a test signal with predetermined temporal development to the secondary-side passive circuit (via the converter) and simultaneously to monitor a measurement signal generated thereby on the secondary side and fed back into the supply path, more particularly to monitor an increase of current in the converter.

First claim

1 . A module for operating at least one illuminant, preferably at least one LED, with at least one electrically insulating barrier, which isolates a primary side capable of being supplied originating from a mains voltage, from a secondary side of the module, from which the at least one illuminant can preferably be supplied,
wherein a secondary-side passive circuit is provided, which is connected in a supply path across the barrier via a galvanically isolated converter to a primary-side control circuit, and wherein the primary-side control circuit is designed to apply a test signal with a predetermined temporal development to the secondary-side passive circuit and, at the same time, to monitor a measurement signal, more particularly an increase of current within the converter, generated thereby on the secondary side and fed back into the supply path.

2 . The module according to claim 1 , wherein, on the secondary side, the passive circuit provides at least two resistors which are connected to a switching element which is designed in such a manner that, in the case of an application of the test signal to the primary side, it first connects the supply path via one resistor/both resistors and, with a time interval, connects the supply path via both resistors/one resistor.

3 . The module according to claim 1 , wherein, on the secondary side, the passive circuit provides at least two resistors, which are connected to at least two switching elements.

4 . The module according to claim 3 , wherein the switching elements are designed in such a manner that, in the case of an application of the test signal to the primary side, the supply path is first connected via the first resistor and, with a time interval, the supply path is additionally or alternatively connected via the second resistor.

5 . The module according to claim 3 , wherein the switching elements are designed in such a manner that, in the case of an application of the test signal to the primary side, the secondary-side resistors are activated in a binary-permuted manner, wherein the permutation can comprise repetitions.

6 . The module according to claim 1 , wherein the primary-side control circuit detects the measurement signals in the converter with a time interval, which reproduce/reproduces a resistance value of the resistor/resistors momentarily connected in the supply path in the secondary-side passive circuit.

7 . The module according to claim 1 , wherein no voltage/current supply is provided on the secondary side.

8 . The module according to claim 1 , wherein the detection of the measurement signal takes place in a repeated manner and, more particularly, in a cyclical manner.

9 . The module according to claim 1 , wherein the control circuit implements an extrapolation on the basis of at least two detected measurement signals.

10 . The module according to claim 9 , wherein the extrapolation is implemented in reverse time.

11 . The module according to claim 9 , wherein the extrapolation determines a resistance value of the passive circuit at the time of the application of the test signal.

12 . A balun with a module according to claim 1 .

13 . A lamp with a module according to claim 1 .

14 . A method for the passive feedback of a measurement signal from the secondary side of an electrically insulating barrier to a control circuit arranged on the primary side relative to the latter, which is connected across the barrier in a supply path via a galvanically isolated converter to a secondary-side passive circuit,
wherein the primary-side control circuit applies a test signal with predetermined temporal development to the secondary-side passive circuit and, at the same time, monitors a measurement signal, more particularly an increase of current within the converter, generated thereby on the secondary side and fed back into the supply path.

Assignees

• Tridonic Gmbh & Co Kg

Inventors

• Dunser Mathias
• Vonach Christoph
• Mohr Martin

Classifications

• H02M3/33553 Primary

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H05B45/37 Primary

  Converter circuits · CPC title

• H05B33/0815

  Electricity · mapped topic

• H05B33/0887

  Electricity · mapped topic

• H02M1/0003

  Details of control, feedback or regulation circuits · CPC title