Tridonic Gmbh Co. Kg

Tridonic Gmbh & Co. Kg

Deepak Makwana

Ian Wilson

Jamie Kelly

Andre Mitterbacher

Roger Kistler

Paul Dalby

Harald Netzer

Stefan Stark

Jagjitpati Shukla

Lukas Saccavini

Wayne Bell

Shukla Jagjitpati

Kevin McDermott

Stephen James

Simon Lecker

James Stephen

Eduardo Pereira

An emergency converter device for lighting applications provides a supply current to a load device such as a lighting module. The emergency converter device has a printed circuit board arranged within a housing. A control circuit such as a microcontroller and a non-volatile memory for storing log data are arranged on the printed circuit board. An interface is configured to connect mechanically and electrically at least one of a status indicator light a test switch or a duration link select switch. The interface has a first connecting element and a second connecting element. The emergency converter device has a connecting means for connecting a data output terminal (USART_TX) and a data input terminal (USART_RX) of the control circuit to the exterior of the housing.

Reading data from a log data storage in an emergency lighting converter

The invention relates to a driver () for emergency lighting means (), comprising output terminals (-) for electrically supplying at least one emergency lighting means (), and a test switch () for starting a test routine controlled by a controller () of the driver (), wherein the driver () is settable to a commissioning mode if the test switch () is activated according to a predefined operation pattern defined by time durations and/or repetition criteria of the operation pattern.

Driver for emergency lighting means

An emergency converter device provides an interface for selecting an operation parameter for an emergency operation mode of the emergency converter device. The emergency converter device provides a supply current Ito a load device, in particular to a lighting module including on or more light emitting diodes. The emergency converter device comprises a control circuit configured to set at least one operating parameter of the emergency converter device, an interface comprising a first terminal and a second terminal for connecting electrically a status indicator light emitting diode, and a detection circuit connected to the control circuit. The detection circuit is configured to detect a polarity of the status indicator light emitting diode connected to the first terminal and the second terminal, and the control circuit selects the at least one operating parameter of the emergency converter device based on the detected polarity.

Duration select switch for an emergency lighting converter

An emergency converter according to the invention is used in lighting applications for operation from an energy storage device in case of mains failure. The converter device comprises a charger circuit configured to charge the energy storage device and a microcontroller circuit configured to control the charger circuit. The driver circuit is preferably implemented in a coupled inductor boost circuit topology. The microcontroller circuit is further configured to control the switch based on a zero crossing of a measured inductor current.

Emergency lighting converter

The invention is related to a driving circuit that provides an operating current for at least one lighting means. The driving circuit comprises an isolated switched converter having a switch () controlled by a control circuit (), wherein a primary side choke () is charged when the switch () is in its conducting state and the primary side choke () is discharged when the control circuit () controls the switch () in its non-conducting state. The circuit comprises first determining means () for monitoring the current through the primary side choke (), and second determining means () for determining a switch-off time, wherein the second determining means () comprises an auxiliary winding () coupled to a secondary side choke () and the second determining means () is configured to monitor the voltage across the auxiliary winding () for determining a switch-off time.

Driving circuit and method for a provision of an operating current for at least one lighting means

The invention relates to an operating device () for operating lighting means, in particular LEDs, comprising: a potential-isolated clocked converter (), having a transformer (T), which has a primary winding (N) and a seconding winding (N), and having a controllable switch (M) arranged on the primary side, wherein the converter () can be supplied with a supply voltage converter (); means () for directly or indirectly sensing the output voltage (Vout); and a control unit (ST) for controlling the switch (M), wherein the secondary current (I) through the secondary winding (N) linearly drops, starting from a position value (Imax), which the switch (M) is switched off, wherein the control unit (ST) is designed to adaptively sense a discharge duration (Tdischarge) between a switch-off of the switch (M) and a subsequent drop in the secondary current () to zero in order to control the secondary current (I).

LED driver

In a first aspect, the invention provides an LED converter, comprising: a resonant converter with a switching regulator, preferably a clocked half-bridge converter, a galvanic barrier, the primary side of which being supplied by the switching regulator and the secondary side of which being arranged for providing directly or indirectly power to terminals for connecting one or more LEDs, a control circuit on the primary side of the galvanic barrier of the resonant converter, a sensing means on the secondary side of the galvanic barrier sensing a secondary side electric parameter indicative of an LED load, when connected to said terminals, a feedback path from the sensing means to the control circuit adapted to feedback the secondary side electric parameter from the secondary side of the galvanic barrier to the primary side of the galvanic barrier, wherein in case no LED string is connected to the LED converter, the control unit is adapted to cyclically control a switching frequency of switching regulator switches, in particular switches of the clocked half-bridge, from a high frequency to a lower frequency, and to monitor whether the secondary side electric parameter reaches a predetermined threshold value, and to, in case the predetermined threshold value is reached, deactivate the switching regulator switches and to activate a voltage protection switch to pull the secondary side electric parameter to ground.

Lighting means insertion detection

A power factor correction circuit includes an inductor L1, a diode D1, a switch Q3 and a controller. An input voltage Vis applied to the inductor L1 which is cyclically discharged through the diode D1 by the operation of the switch Q3. The switch Q3 is controlled by the controllerwhich varies the on period of the switch Q3, during which the inductor is charged, for adjusting an output voltage Vtowards a target value V. The method includes obtaining an indication of the inductor L1 reaching a discharged state in response to the switch being in an off state. The controllermonitors at least one of the switch on period Tand the switch off period Tto identify when the input voltage Vis an alternating voltage AC input, and when it is likely to be a non-alternating voltage DC input. When a non alternating voltage is detected, steps may be taken to reduce interference.

Power factor correction

A power factor correction circuit includes an inductor L, a diode D, a switch Qand a controller. An input voltage Vis applied to the inductor Lwhich is cyclically discharged through the diode Dby the operation of the switch Q. The method of operation includes: operating a controllerto obtain an indication of the voltage across the switch Q, monitoring the indication of the voltage across the switch Qto determine when the inductor Lreaches a discharged state in response to the switch being in an off state, and the switch Qbeing controlled by the controllerto vary the on period of the switch Q, during which the inductor is charged, for adjusting an output voltage Vtowards a target value V. The controllermonitors at least one of the indication of the voltage across the switch Qand the ratio of the switch on period Tto the switch off period Tfor detecting that the input voltage Vhas a low value.

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Tyne and Wear, United Kingdom

Deepak Makwana