WO2015113090A1

WO2015113090A1 - Registering an led module

Info

Publication number: WO2015113090A1
Application number: PCT/AT2015/050024
Authority: WO
Inventors: Patrick MARTE
Original assignee: Tridonic Gmbh & Co Kg
Priority date: 2014-01-29
Filing date: 2015-01-28
Publication date: 2015-08-06
Also published as: AT15167U1; DE112015000558A5

Abstract

The invention relates to a method for reading out information from an LED module (2), comprising the following steps: - transmitting (21) an electrical parameter relating to a circuit (6) in a galvanically-isolated manner by means of an evaluation unit (24) on the secondary side of a transmitter, said circuit (6) being assigned to the LED module (2), and - preferably indirectly registering an electrical parameter of said circuit (6) or its temporal change based on a parameter registered on the primary side of the transmitter (21), the electrical circuit parameter preferably being the current running through the circuit or the resistance or impedance value of said circuit.

Description

Capture of an LED module

The present invention relates to a module for the

Operation of at least one lamp or a

Illuminant path, preferably at least one LED, and a driver for supplying or operating the module.

From the document US 2012/0235598 AI an LED module is known, in addition to LEDs additionally a

Identification element for determining a

Operating parameters of the LED module has. When

Identification element may be provided a coding resistor in the LED module. The LED driver connected to the LED module puts a voltage over it

Coding resistance. The self-adjusting current cut through the coding resistor is measured, so as to bring information regarding the target current of the associated LED module in experience.

In this known circuit arrangement

However, the problem is that when providing a galvanically isolated LED driver information from the

Secondary side of the SELV barrier (safety extra low voltage barrier) must be returned to the primary side. In particular, it is necessary to return the measured parameter via such a SELV barrier. This feedback of information from the secondary side of the SELV barrier to the primary causes one

additional effort and additional costs, for example because then an optocoupler must be provided. The invention now addresses this problem.

According to the invention, a method for

Reading information from an LED module, comprising the steps:

- Electrically isolated transfer of electrical power to a circuit on the secondary side of a transformer, such that the circuit is applied to a defined voltage, wherein the circuit is associated with the LED module, and

- indirectly detecting an electrical parameter of the circuit or its temporal change based on a parameter that is detected on the primary side of the transformer.

The electrical parameter of the circuit can be e.g. be the current through the circuit or the value of the resistor or the impedance of the circuit. The on the

Primary side of the transformer can be detected e.g. a timing parameter, such as the frequency and / or duty cycle, of the clocked transmitter.

In the method, the secondary side, the LED module associated circuit when concerns the defined

Voltage at least one, preferably several

Perform load changes.

The electrical parameter of the circuit can be on the

Secondary side of the transformer information from a functionally connected to the LED module sensor

reflected, for example, from a daylight, smoke or

Motion sensor. Two or more different discrete voltage levels may be applied to the secondary side circuit. The secondary side circuit can be at

different voltage levels electrically

behave differently, leaving different

Information on the primary page are detectable.

The circuit may comprise an intelligent circuit that generates defined load changes, and / or an ohmic resistance.

The voltage at the circuit can be detected indirectly, for example by means of a measuring winding coupled to the secondary side of the transformer, on the primary side of the transformer.

According to the invention, a method for

Reading information from an LED module, comprising the steps:

- electrically isolated transmission of an electrical parameter of a circuit by an evaluation unit on the secondary side of a transformer, wherein the circuit is associated with the LED module, and

- Preferably indirectly detecting an electrical parameter of the circuit or its temporal

Change based on a parameter based on the

Primary side of the transformer is detected, where

Preferably, the electrical parameter of the circuit is the current through the circuit or the value of the resistor or the impedance of the circuit.

According to the invention, a method for reading out the value of a coding resistor of an LED module, comprising the steps: electrically transferring an electrical power to the coding resistor which is on the

Secondary side of a transformer is arranged such that a defined voltage is applied to the Kodierwiderstand, and

- indirectly detecting the current through the

Coding resistance or resistance of the

Coding resistance based on a parameter that is detected on the primary side of the secondary side of the transformer.

The transformer may be a primary side actively clocked transformer, such as, for example, a flyback converter.

The current through the coding resistor or the

Resistance value of the coding resistor can be determined on the basis of a timing parameter, for example the frequency and / or the

Duty cycle, the primary side clocked transformer are detected. This is a

Timing parameter that adjusts to achieve the defined voltage on the coding resistor.

The invention also relates to a readout converter adapted to read information from a connectable and powerable LED module, comprising:

a transformer for galvanically transmitting an electrical parameter to a circuit associated with the LED module, based on the

Secondary side of the transformer is supplied, such that the circuit is applied to a defined voltage, and

- A arranged on the primary side of the transformer detection circuit for indirectly detecting a

electrical parameter of the circuit or its

temporal change. According to the invention, it is further proposed a method for reading out the value of a coding resistor of an LED module, comprising the steps:

electrically transferring an electrical power to the coding resistor which is on the

- indirectly detecting the current through the

Coding resistance or resistance of the

Coding resistance based on a parameter that is detected on the primary side of the transformer.

The voltage drop across the coding resistor can

indirectly, for example by means of a coupled to the secondary side of the transformer measuring winding, are detected on the primary side of the transformer.

According to the invention, an LED converter is provided, which is designed to read out information from a connectable and powerable LED module, comprising:

- A transformer supplied on the primary side for the galvanically separated transmission of electrical power to a LED module associated circuit which is supplied from the secondary side of the transformer, such that the circuit is applied to a defined voltage, and

electrical parameter of the circuit or its

temporal change. The detection circuit may be designed to detect one, preferably a plurality of load changes of the secondary side, the LED module associated circuit.

The electrical parameter of the circuit on the

Secondary side of the transformer can reproduce information from a functionally connected to the LED module sensor, for example. Of a daylight, smoke or

Motion sensor.

The converter may be adapted to the

Secondary-side circuit to apply two or more different discrete voltage levels.

The voltage drop across the coding resistor can

According to the invention, an LED converter designed to supply and read out the value of a coding resistor of an LED module is proposed,

comprising:

- A transformer supplied on the primary side for the galvanically separated transmission of electrical power to the LED module associated Kodierwiderstand that can be supplied from the secondary side of the transformer, such that a defined voltage is applied to the Kodierwiderstand, and

electrical parameter of the coding resistor or its temporal change. The transformer may be a transmitter clocked on the primary side by a control circuit by means of at least one switch, such as, for example, a flyback converter.

The voltage drop across the coding resistor can be detected indirectly, for example by means of a measuring winding coupled to the secondary side of the transformer, on the primary side of the transformer.

The invention proposes an LED driver comprising an LED converter described above for reading information from a connectable LED module, and an LED converter for supplying the LEDs de connectable LED module.

Further features, advantages and features will now become apparent to those skilled in the art from the following detailed description

Description of embodiments and below

Referenced to the figures of the accompanying drawings.

1 shows a schematic representation of a

Embodiment of an LED lighting system according to the invention with LED driver and LED module,

Fig. 2 shows a schematic representation of a

Embodiment of the circuit

Structure of an LED converter according to the invention of the LED driver for reading information from a connectable LED module,

Fig. 3 shows a relationship between the current

by a detection circuit according to the invention and the resistance value of the detection circuit, Fig. 4 shows a schematic representation of a

Embodiment of the circuit

Structure of an LED converter according to the invention of the LED driver for supplying a connectable

LED module,

Fig. 5 shows an inventive LED module with an intelligent circuit for executing

Load changes,

Fig. 6 shows an embodiment of a

inventive intelligent circuit for carrying out load changes, and

Fig. 7 shows a schematic representation of a

In Fig. 1, an inventive LED lighting system 1 is shown schematically. The LED lighting system 1 comprises an LED module 2 'LEDs and an LED driver 3 for operating the LED module 2.

As can be seen in FIG. 1, the LED lighting system 1 according to the invention additionally has a supply unit 7, which preferably has an input voltage Ve,

especially AC mains voltage, is supplied. This input voltage Ve is a filter and

Rectifier unit 8 is supplied, which preferably filters the input voltage Ve by means of, for example, at least one capacitor. The filter and rectifier unit 8 comprises a rectifier, for example in the form of a

Bridge rectifier for carrying out a rectification of the preferably filtered input voltage Ve.

The rectified input voltage Ve is then an active clocked power factor correction or PFC (Power Factor Correction) circuit 9 of

Supply unit 7 supplied. The output voltage of the supply unit 7 is a DC voltage, which is also identified as bus voltage Vbus. Such

Bus voltage Vbus is known to have a substantially constant voltage with a small ripple compared to the amplitude of the bus voltage Vbus. The supply unit 7 may comprise another converter for generating a bus voltage Vbus instead of the PFC circuit 9.

After the PFC circuit 9, the supply unit 7 can optionally also have a further insulation unit (not shown), which essentially has the function of insulation or galvanic isolation and, for this purpose, as a galvanic separation element, e.g. includes a transformer. This isolation unit preferably has a transformer topology with galvanic isolation according to e.g.

a half-bridge flux converter or a resonant converter.

The bus voltage Vbus, which can alternatively also be a constant battery voltage, supplies the LED driver 3, which has three terminals or pins A / LED +, A / Rparam. and A / LED is connected to the LED module 2. The LED module 2 comprises three connections LED +, Led-param. and LED, which are connected to the three terminals of the LED driver 3, respectively. About the connection between the

Terminals A / LED, LED will be a common ground for the LED driver 3 and the LED module 2 are provided. The terminals A / LED +, LED + are connected via a line, so that LEDs 4 of the LED module 2, starting from the LED driver 3 can be operated with power.

The LEDs 4 are preferably arranged between the terminals LED + and LED- as an LED track. The LEDs 4 can be connected in series or in parallel between the terminals LED + and LED-. Alternatively, a configuration with several in parallel

Series circuits of one or more LEDs conceivable. As an alternative to the embodiment of FIG. 2, the LED module 2 may also have only one LED. The LEDs 4 can all be of the same type and in particular emit the same color, e.g. White. Also, the LEDs of the LED module may have different colors, which together may e.g. give a white mixed light, radiate.

The LED module 2 further comprises a coding circuit 6, which between the terminals Led param. and LED is provided. In the embodiment of FIG. 1, the coding circuit 6 consists of a coding resistor Rparam .. The coding circuit 6 may be a passive circuit. As can be seen from FIG. 1, the LED path and the coding circuit 6 are each connected to ground with LED and connected in parallel to one another. In Fig. 1 is shown as at the coding circuit 6 between the terminals

A / Rparam. and A / LED, a voltage of e.g. 5 volts

is created. The output current at terminal A / Rparam., Which also preferably corresponds to the current through the coding circuit 6, is Ilparam. characterized.

According to the coding circuit 6 encodes a

Information that can be transmitted to the LED driver 3. This information preferably relates to the LED module 2 and serves to identify the LED module 2. By reading this information, the LED driver 3 is then able to the connected LED module 2 to

identify. For example, For example, the information coded in the coding circuit 6 can define the designation of the LED module 2 or the color generated thereby. The information transmitted via the coding circuit 6 can be

preferably an operating parameter for the LED module 2, e.g. a nominal current or rated current or a

Target power or rated power for the LED module 2. The invention thus proceeds in particular from the assumption that a coding circuit 6 or a coding resistor Rparam. is provided on the LED module whose resistance value encodes the setpoint of the current for the associated LED module. The LED driver receives this information and regulates the current or power for the LED module 2 accordingly.

In Fig. 1 the circuit of a compensation unit 5 is shown inside the LED module 2, e.g. between the two terminals LED + and Led-param .. this

Compensation unit 5 is suitable for influencing or changing the value of the operating parameter coded by the coding circuit 6. For example, can the

Compensation unit 5 depending on the

Ambient temperature of the LED module influence the coded target current such that at too high

Ambient temperature of the read from the LED driver 3 target current for the LEDs is lowered. This measure, known as "thermal derating", can counteract premature aging of the LEDs that occur at too high ambient temperatures, which can also cause heat to be dissipated by the LEDs be reduced. This compensation unit 5 is

optional and can also be omitted, so that

between the terminals LED + and Led-param. none

such compensation unit 5 is provided.

Fig. 2 shows a schematic representation of a

Embodiment of the circuit construction of the LED driver according to the invention 3. Fig. 2 shows

in particular a read-out converter 20, which is arranged in the LED driver 3 and for the reading of

Information from the LED module 2 or from the

Coding circuit 6 is responsible.

As already explained in connection with FIG. 1, according to the invention a predetermined defined

Voltage drop Vparam. via the coding circuit 6 or via the coding resistor Rparam. generated. It is assumed that the then adjusting current Iparam. represents the coding size. The stream Iparam. is the current at the output A / Rparam. or the current through the

Coding resistance Rparam .. Alternatively, the value of the electrical resistance of the coding resistor Rparam. represent the coding size.

In the embodiment of Fig. 2, the voltage

Vparam. about the coding resistor Rparam. starting from a primary-clocked flyback converter 21, also called flyback converter produced. The flyback converter is mentioned here as an example for a readout converter. The voltage Vparam. may alternatively be another

clocked potential-separated power supply can be generated. The flyback converter 21 comprises a primary winding PI, which is coupled to a secondary winding S1. The

Primary winding PI is in series with a switch Q1, e.g. is designed as a transistor or as a MOSFET, connected. The switch Ql is connected to a primary side ground. On the series circuit consisting of the primary winding PI and the switch Ql is applied to a voltage pLVPS. This voltage pLVPS is preferably a DC voltage in the form of e.g. a low voltage bwz. one

Low voltage, starting from the in Fig. 1

shown bus voltage Vbus can be generated.

The secondary winding Sl is connected on the one hand to the connection A / LED, which is a secondary-side ground

Are defined. On the other hand, the secondary winding Sl via a diode Dl with the terminal A / Rparam. connected. The flyback converter has another on the secondary side

Capacitor Cl to the terminals A / Rparam. and A / LED.

The operation of the flyback converter is known per se. The switch Ql of the flyback converter is alternating and by means of a control signal FLB

high frequency on and off. A conducting phase with the switch Q1 closed is followed by a blocking phase with the switch Q1 open, and so on.

The resistance Rparam. is arranged on the secondary side of this clocked potential-separated power supply in the form of a flyback converter. By means of a

Further winding P2, a signal is now generated at a terminal or pin ADC, in the sense of a

mirrored voltage the voltage Vparam. on the

Coding resistor Rparam. reproduces. This winding P2 is arranged on the primary side. Parallel to the further winding P2 is a resistor R2 arranged, as well as a

Series connection comprising a diode and two resistors R3, R4 of a voltage divider. The voltage at the terminal ADC is the voltage Vparam via the voltage divider R3, R4 and the ratio of the number of turns of the secondary winding Sl and the other primary winding P2. on the coding resistor Rparam. indirectly again.

The voltage Vparam. on the coding resistor Rparam. is set to a defined voltage value of e.g. 5 volts regulated by a control unit 23. The control unit 23 receives as feedback information, the voltage at the terminal ADC, the voltage Vparam. reproduces. By changing the timing of the switch Ql, the output voltage Vparam. to be changed. For example, the voltage Vparam. by changing the duty ratio tv of the control signal FLB for the switch Ql or by

Change in the frequency f of the control signal FLB

customized. For the change of the duty ratio tv or the frequency f, the control unit 23 is responsible.

According to the invention, the voltage Vparam. on the

defined value kept constant. For this purpose, the

Frequency f or the duty cycle tv of the switch Ql the flyback converter changed until the signal ADC indicates that the voltage on the coding resistor

Rparam. reaches and maintains the predetermined voltage of, for example, 5 volts.

As a size for the current through the resistor Rparam. at the predetermined voltage drop of, for example, 5 volts, is now to reach the predetermined voltage across the resistor Rparam. necessary frequency f of the timing of the flyback switch Ql used. With other words, from the required

Voltage drop Vparam. necessary frequency f is set to the required nominal current for the LED module. 2

concluded that the coding resistor Rparam. assigned. Alternatively to the frequency f can also

Duty cycle tv the timing of the switch Ql or the duty cycle tv of the control signal FLB be used.

Advantageously, therefore, the invention offers the possibility to bring information from the secondary side of the SELV barrier or the galvanic isolation on the primary side in experience, without affecting an optocoupler or

to rely on a similar device to cross the SELV barrier.

Once the voltage Vparam. at the coding circuit 6 to the defined voltage of e.g. 5 volts through

appropriate control of the switch Ql of the flyback converter has been set or regulated, has also the frequency f and / or the duty cycle of the

Control signal FLB for the switch Ql stabilized to a certain value. This value is used according to the invention in order to be able to fall back on the Kodiergröße, as said the Kodiergröße either the adjusting at the defined voltage current Iparam. or the value of the coding resistor Rparam. is.

The relationship between the timing parameter - frequency f and / or the duty cycle tv of the control signal FLB - and the coding size may e.g. by means of a stored in the LED driver 3 or in the control unit 23 look-up

Table or lookup table. According to one embodiment of the invention, as already mentioned, the defined voltage for the voltage Vparam. Be over the coding circuit 5 volts. The range for the value of the coding resistor Rparam. eg goes from lkQ to 100 kQ. This gives an area for the current Iparam. from 5mA to 50μΑ. The connection between the current Iparam. and the value of the coding resistor is shown in FIG.

Preferably, the resistor Rparam. based on

Frequency f of the control signal FLB determined. The following table is an example of a corresponding look-up table:

In addition, the supply circuit Vparam formed by the readout converter 20 can be made. also for

other purposes in the LED driver 3 than

Use low voltage supply.

The optional compensation unit 5 of Fig. 1 may e.g. a thermistor whose resistance changes with temperature. For a PTC thermistor or PTC

(Positive Temperature Coefficient) resistance increases the electrical resistance with increasing temperature, and vice versa for a thermistor in the form of a

Thermistor or NTC (Negative Temperature Coefficient) Resistor. The compensation unit 5 preferably ensures that the current through the coding circuit 6 changes. Thus, the compensation unit 5 may be e.g. at high ambient temperatures the detection of the

Resistance Rparam. in such a way that the detection circuit 22 does not detect the resistance value of the connected coding circuit 6, but rather a changed resistance value which is lower

Target current corresponds.

Fig. 4 shows a schematic representation of a

Embodiment of an LED converter 40 for

Supply of a connectable LED module 2. The LED converter 40 is part of the LED driver. 3

The LED converter 40 includes a switching regulator, e.g.

a half-bridge converter having a

potential lower switch Q2 ^λ and a

higher potential switch Ql ^λ . The half-bridge converter is supplied by the bus voltage Vbus shown in FIG. The switches of the half-bridge can be configured as transistors, eg FET or MOSFET.

At the midpoint of the half-bridge, i. between the two

Switches Q2 Q1 is connected to a resonant converter in the form of an LLC converter. The LLC converter comprises a series circuit of a capacitor Cl a

Inductance LI ^λ and a primary winding PI ^{λ of} a galvanic lock or a transformer. The

Capacitance Cl ^λ and the inductance LI ^λ form an LC resonant circuit. On the secondary side, a secondary winding Sl ^{λ is} provided, which is coupled to the primary winding PI ^λ and which is connected to a diode Dl ^λ . The

Secondary winding Sl ^λ is also connected to a secondary side ground sGND. The cathode of the diode Dl is ^λ + connected to the one shown in Fig. 1 terminal A / LED. The connection A / LED- is connected to the secondary side ground sGND. The LED module 2 can be connected to the connections A / LED + and A / LED- and can be supplied.

By appropriate control of the switch Ql Q2 ^λ, for example by the control unit 23 of the LED driver 3 can

As is known, a desired current for the LED module 2 are generated. This desired current is preferably the current coded by the coding circuit 6. For this, e.g. a look-up table in the LED driver provided for a particular coding size - e.g.

a certain value of the resistance Rparam. - Sets a corresponding current for the LED module.

For controlling the current for the LED module 2 can

preferably the current through the LED module for

Control unit 23 are returned. Other known

Methods for controlling the current can be used.

Instead of the LED converter 40 with LLC converter shown in FIG. 4, the LEDs of the LED module 2 can be operated with other converters known per se and supplied with power. It is conceivable, e.g. the use of a flyback converter, or a buck converter. Since a Buck converter has no galvanic isolation is

preferably provided with the use of a buck converter mentioned in connection with FIG. 1 insulation unit. The read-out converter 20 for reading the information and the LED converter 40 for supplying the LEDs are operated independently of each other. This is advantageous in that the reading of the information no

Influence on the supply of LEDs has, and vice versa.

As shown in FIG. 5, according to the invention, a digital coding of characteristic values of the LED module can also take place in that instead of or in addition to

Coding resistor Rparam. an intelligent circuit 50 is provided on the secondary side. The smart circuit 50 is preferably between the terminals Led-param. and LED connected.

This intelligent circuit 50 can be implemented, for example, by applying a predefined voltage of, for example, Vparam. = 7 volts DC in an information readout mode. In this information read-out mode, the smart circuit 50 encodes information

For example, the fact that it generates defined load changes, in which case these load changes are reflected on the pin ADC and connected by a connected there

intelligent circuit, such as from the control unit 23, according to a predefined protocol interpret as multiple information, for example in the sense of a coding resistor for the nominal current of the LED module. If the intelligent circuit 50 is designed to switch between two load states, a binary coding can be performed. This binary

Coding is again decoded by the control unit. In addition, depending on the protocol agreed, this digital information may also include sensor information, such as

For example, temperature, smoke detectors, motion detectors, daylight sensor, etc. represent. In Fig. 5, e.g. a sensor 51 is provided, the measured values to the

intelligent circuit 50 which in turn transmits the measured values or information derived therefrom to the primary side of the read-out converter 20 or to the control unit 23 according to the digital coding by means of load jumps.

For example, the control unit 23 may be configured to detect whether the LED module is designed for the transmission of digital or analog information. For example, the LED driver 3 at the start by means of the read-out converter 20 output a voltage at the output. If the LED module is designed to output a digital information, then it can within a given feedback time a defined

Output load change as a pulsed signal and thus load the readout converter 20. The control unit 23 can monitor the load within the predetermined feedback time. If the control unit 23 detects a repeated load change in the sense of a pulsed signal within the predetermined feedback time, the

Control unit 23 thus recognize that the LED module is designed for the transmission of digital information and adjust the further operation of the read-out converter 20 thereto and detect the transmission of digital information.

In addition or as an alternative to the transmission of digitally coded information, a pulsed signal can also be emitted by the LED module, wherein for example, about the frequency or the

Ratio of the pulsed signal information can be transmitted coded.

According to the invention, a bidirectional exchange of information between the LED module and the LED converter 40 can also take place. For example, the read-out converter 20 can also be operated in such a way that it can be activated by repeatedly switching the clocking on and off

low frequency the output voltage changes between two values. In this case, the switch of the read-out converter 20, for example, the switch Ql, high-frequency to

Transfer of energy and generation of a voltage Vparam. clocked. This high-frequency clocking can be interrupted in low-frequency pulse packets, so that, for example, a low-frequency output of

Packages of tension Vparam. can yield to the nominal value and a lowered value, wherein the lowered value can also be zero. These pulse packets can recognize the LED module as transmitted information such as a query of a parameter. In response to such a query of a parameter, the LED module, for example, in the manner already explained according to the agreed protocol, a digital information such as an operating parameter, a

Aging information or sensor information

transfer. In the case of bidirectional communication between LED module and LED driver, the LED driver may also communicate brightness commands or other control information to the LED module.

Fig. 6 shows an embodiment of a

intelligent circuit 50 according to the invention. Between the connections Led-param. and LED of the LED module is in This embodiment, only an intelligent circuit 50 is connected. Alternatively, parallel to the

smart circuit 50 a coding resistor Rparam. be provided.

The smart circuit 50 includes a first one

Series connection consisting of a first resistor R60 and a first switch S60, and a parallel connected second series circuit consisting of a second resistor R61 and a second switch S61. The resistors R60, R61 have different

Resistance values. The smart circuit 50 also includes logic (not shown) that is configured to turn either the first switch S60 on and off the second switch S61, or vice versa, the first switch S60 off and the second switch S61

turn. Thus, the smart circuit 50 may have two different resistance values, and thus perform load jumps and binary digital coding.

Alternatively or additionally, a readout of the LED module 2 by the readout converter 20 can be limited in time by the smart circuit 50 is active only during a start phase due to a predetermined period of time as soon as a supply voltage to the LED module 2 is applied. In this case, this supply voltage can also correspond to the nominal output voltage of the LED driver 3 for normal operation. After applying the supply voltage, the smart circuit 50 is activated on the LED module 2 and represents a load for the readout converter 20. The load is, for example, a constant or repeatedly changing active power load and generates a Power consumption at the terminal LEDpram. In addition, in this case also the connected LED track 4 become conductive, whereby the LED driver 3 operates the LED module 2 in the lighting mode. Now, the read-out converter 20 may measure, for example, a discharge current through this load, an absolute current consumption of the circuit 50, a frequency of a change in power consumption of the LED module 2 via the terminal LEDparam, or a duty cycle or an amplitude of a power consumption change.

Based on the result of the measurement, the readout converter 20 can conclude operating and / or maintenance parameters. For example, the read-out converter 20 may determine a desired or forward voltage or a desired current of the LED module and this the LED driver

forward, so that this can apply this parameter to the LED module 2. For example, it is now automatically possible to deactivate the circuit 50 after the predetermined period of time has elapsed for the starting phase. The specification of this period for the starting phase can be determined for example by a time-charge circuit, wherein a

Timer capacitor is charged and after the charging of the timer capacitor, the circuit 50 is deactivated. As a result, the circuit 50 does not absorb any power in the continuous lighting operation of the LED track 4 and therefore does not influence the lighting operation of the LED track 4.

Preferably, the starting phase is longer than that

Feedback time, so on the one hand reading the LED

Module through the readout converter 20 allows on the other hand in continuous operation no energy through the

Circuit 50 is consumed. The read-out converter 20 can also be designed so that it is activated only at certain points in time, for example after each restart or switch-on of the LED driver 3 or even after a certain number of operating hours has elapsed for a certain period of time

Read information from the LED module 2. After this period of time, the power supply of the LED module 3 via the terminal LEDpara, again deactivated, so that the LED module 2 is supplied only via the terminals LED + and LED- and the LED track 4 can shine accordingly. Additionally or alternatively, as already mentioned, the circuit 50 may be designed such that it is only active during a start-up phase.

According to the invention thus an interface to

Transmission of energy to the secondary side of the LED converter provided so as to be able to trigger or retrieve information from the secondary side without separate feedback via the SELV barrier.

A further embodiment is that over the interface shown, selectively discrete voltage levels can be generated on the secondary side, wherein in the

respective different voltage levels

different read operations can be generated. For example, it could be provided that at a voltage level of 5 volts as determined at the pin ADC an ohmic resistance is read - over the

primary-side timing parameter - and of a deviating DC voltage level of, for example, 7 volts, an intelligent circuit 50 in the sense of a digital protocol by load change information

reproduces. The read-out converter 20 may also be designed in such a way that it has, for example, as a transformer at least one optocoupler, which transmits information from the side of the LED module to the side of the control unit 23

transfers. For example, the secondary side, that is to say the side connected to the LED module, can be fed from the voltage LED + at the output of the LED driver 3. The primary side, that is to say the side of the readout converter connected to the control unit 23, can be controlled by the primary side of the LED driver 3, in particular the

Primary side of the LED converter 40 are fed from.

As a transformer can also other potential separating

Devices such as an air coil, a Hall sensor or a capacitor for transmission over the

Potential barrier can be used.

The secondary-side part of the read-out converter 20 may for example also be arranged on the secondary side of the LED driver 3, in particular the secondary side of the LED converter 40, that it is arranged quasi between the two outputs LED + and LED- of the LED driver , An example is shown in FIG. Fig. 7 shows another example of one

electrically isolated or isolated read-out converter 20. The LED converter 40 is part of the here only

partially illustrated LED driver 3.

For example, the LED converter 40 may be preceded by an isolated flyback converter or an isolated half-bridge converter. On the primary side of the LED driver 3, so for example on the primary side of the isolated flyback converter or isolated half-bridge converter, the control unit 23 may be arranged. In Fig. 7 As already explained, only a section of the LED driver 3 is shown exactly. Of the primary side of the LED driver 3, only the control unit 23 and the LED converter 40 are shown only symbolically. By

corresponding control of the switches, for example, the two switches Ql Q2 ^λ in the case of an isolated

Half-bridge converter, as already explained by the control unit 23 of the LED driver 3, a desired current or voltage for the LED module 2 are generated. The buck converter shown in FIG. 7 is only an optional element and not necessarily for the

Function required. For example, the

Buck converter can not be present and the LED converter 40 directly feed the LED module 2. But it is

preferably before the output for the LED module 2 an evaluation unit 24 is present.

The control unit 23 is connected to the primary side of the

Transformer 21 connected, thus can be done from the primary side of the LED driver 3 from a readout of the information from the LED module 2. For example, on the

Secondary side of the readout converter 20 a

Evaluation unit 24 is arranged, by means of which the voltage applied to the terminal Vparam signal is processed and transmitted via the transformer 21. For example, as a kind of level offset stage, it may be the voltage or the current at the resistor Rparam or that from the intelligent one

Circuit 50 output digital information in accordance with an agreed protocol via the transmitter 21 are transmitted.

It takes place as, for example, a galvanically separated transmission 21 of an electrical parameter

Circuit 6 by an evaluation unit 24 on the Secondary side of a transformer 21. The circuit 6 is associated with the LED module 2. Preferably, an indirect detection of an electrical parameter of the circuit 6 or its temporal change takes place on the basis of a parameter which is detected on the primary side of the transformer 21, wherein preferably the electrical

Parameter of the circuit is the current through the circuit or the value of the resistor or the impedance of the circuit. It is thus detected on the primary side of the transformer 21, an electrical parameter by a

Evaluation unit 24 is transmitted from the secondary side of a transformer 21 to the primary side of the transformer 21.

The invention also relates to a method for transmitting information via an LED module, wherein the LED module can output a defined load change as a pulsed signal at a designated connection in a predetermined response time or a constant load

can represent, and the LED driver has a readout converter, which can monitor the corresponding terminal of the LED module within this response time and can detect whether a pulsed signal or a constant load is present as an information source and on which

Transmission mode (pulsed signal or constant load) the LED module can transmit the information.

In this application, the primary side of a transformer is the side of the transformer facing the power input side, while that of the secondary side is that of the transformer

Net input side facing away from the transformer, so the output to the LED module side facing the transformer is called. Reference sign

1 LED lighting system

2 LED module

3 LED drivers

4 LEDs

5 compensation unit

6 coding circuit

7 supply unit

8 filter and rectifier unit

9 PFC circuit

20 converter for readout (readout converter)

21 transformers

22 detection circuit

23 control unit

40 LED converter for supply

50 intelligent circuit

51 sensor

Claims

claims

Method for reading information from an LED module (2), comprising the steps:

- galvanically isolated transmission (21) of a

electrical parameter of a circuit (6) by an evaluation unit (24) on the secondary side of a transformer, wherein the circuit (6) is associated with the LED module (2), and

- Preferably indirectly detecting an electrical parameter of the circuit (6) or its temporal change based on a parameter which is detected on the primary side of the transformer (21), wherein preferably the electrical parameter of the circuit, the current through the circuit or the value of

Resistor or the impedance of the circuit is.

Method according to claim 1,

in which the secondary-side, the LED module (2) associated circuit (6) in concern of the

defined voltage performs at least one, preferably several load changes.

Method according to claim 1 or 2,

wherein the electrical parameter of the circuit (6) on the secondary side of the transformer (21) a

Information from one with the LED module (2)

Functionally connected sensor (51) reflects, for example. Of a daylight, smoke or motion sensor.

A method according to any one of the preceding claims, wherein two or more different discrete voltage levels are applied to the secondary side circuit (6) can be applied and the secondary-side circuit (6) electrically different behaves at different voltage levels, so that different information on the primary side can be detected.

Method according to one of the preceding claims, in which the circuit (6) has an intelligent circuit (50) which generates defined load changes, and / or an ohmic resistor (Rparam.).

Method according to one of the preceding claims, wherein the voltage at the circuit (6) indirectly, for example by means of a with the secondary side of the

Transformer (21) coupled measuring winding (P2), is detected at the primary side of the transformer (21).

Method for reading out the value of a

Coding resistance of an LED module (2), comprising the steps:

- electrically isolated transmission of an electrical power to the Kodierwiderstand (6), which is arranged on the secondary side of a transformer (21), such that at the Kodierwiderstand (Rparam.) A defined voltage is applied, and

- indirectly detecting the current through the

Coding resistance (Rparam.) Or the resistance value of the coding resistor (Rparam.) Based on a

Parameters detected on the primary side of the secondary side of the transformer (21).

8. The method according to any one of the preceding claims, wherein the transformer (21) is a primary side actively clocked transformer, such as, for example, a flyback Converter.

9. The method according to claim 7 or 8,

wherein the current through the coding resistor (Rparam.) or the resistance value of the coding resistor

(Rparam.) Based on a timing parameter, for example, the frequency and / or the duty cycle of the

primary-clocked transformer (21) is detected, which adjusts to achieve the defined voltage at the coding resistor.

10. The method according to claim 7,

wherein the voltage drop across the Kodierwiderstand indirectly, for example. By means of a coupled to the secondary side of the transformer measuring winding, at the

Primary side of the transformer is detected.

11. A readout converter (20) adapted to read information from a connectable and powerable LED module (2), comprising:

- A transformer (21) for the galvanically separated transmission of an electrical parameter to the LED module (2) associated circuit (6), the

can be supplied from the secondary side of the transformer, such that a defined voltage is applied to the circuit (6), and

- A on the primary side of the transformer (21) arranged detection circuit (22) for indirectly detecting an electrical parameter of the circuit (6) or its temporal change.

12. Converter according to claim 11,

wherein the detection circuit (22) is adapted to one, preferably a plurality of load changes of secondary side, assigned to the LED module

Capture circuit.

13. Converter according to claim 11 or 12,

in which the electrical parameter of the circuit on the secondary side of the transformer gives information from a sensor functionally connected to the LED module, for example from a daylight, smoke or motion sensor.

14. Converter according to one of claims 11 to 13, which is adapted to the secondary side

Circuit to apply two or more different discrete voltage levels.

Converter according to one of claims 11 to 14, wherein the voltage drop across the Kodierwiderstand indirectly, for example. By means of a coupled to the secondary side of the transformer measuring winding, is detected on the primary side of the transformer.

16. Elite Converter (20), which can be used for electrical

Supplying and reading out the value of a

Encoding resistor (Rparam.) Of an LED module (2) is designed, comprising:

- A transformer (21) fed on the primary side for the galvanically separated transmission of an electrical power to a LED module assigned

Coding resistor (Rparam.) Which can be supplied from the secondary side of the transformer, such that the coding resistor is applied to a defined voltage, and

- one on the primary side of the transformer

arranged detection circuit (22) for indirect Detecting an electrical parameter of

Coding resistance or its temporal change,

17. A converter according to any one of claims 11 to 16, wherein the transformer is a clocked by a control circuit by means of at least one switch primary active clocked transformer, such as, a flyback converter.

Converter according to claim 16 or 17,

wherein the voltage drop across the coding resistor is detected indirectly, for example by means of a measuring winding coupled to the secondary side of the transformer, on the primary side of the transformer.

19. A converter according to any one of claims 11 to 18, wherein the converter for bidirectional exchange of information between the LED module and the

Converter is designed.

20. LED driver (3) having a readout

A converter (20) according to any one of claims 11 to 18 for reading information from a connectable LED module (2), and an LED converter (40) for

Supplying the LEDs of the connectable LED module (2).