WO2015077812A2 - Module à led - Google Patents

Module à led Download PDF

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Publication number
WO2015077812A2
WO2015077812A2 PCT/AT2014/050283 AT2014050283W WO2015077812A2 WO 2015077812 A2 WO2015077812 A2 WO 2015077812A2 AT 2014050283 W AT2014050283 W AT 2014050283W WO 2015077812 A2 WO2015077812 A2 WO 2015077812A2
Authority
WO
WIPO (PCT)
Prior art keywords
led
led module
converter
circuit
load
Prior art date
Application number
PCT/AT2014/050283
Other languages
German (de)
English (en)
Other versions
WO2015077812A3 (fr
Inventor
Günter MARENT
Original Assignee
Tridonic Gmbh & Co Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from ATGM445/2013U external-priority patent/AT14906U1/de
Application filed by Tridonic Gmbh & Co Kg filed Critical Tridonic Gmbh & Co Kg
Priority to US15/038,564 priority Critical patent/US10397993B2/en
Priority to EP14830495.9A priority patent/EP3075213B1/fr
Priority to CN201480065319.0A priority patent/CN105794315B/zh
Publication of WO2015077812A2 publication Critical patent/WO2015077812A2/fr
Publication of WO2015077812A3 publication Critical patent/WO2015077812A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/28—Circuit arrangements for protecting against abnormal temperature
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/24—Circuit arrangements for protecting against overvoltage

Definitions

  • the present invention relates to an LED module, an LED converter, and methods that make it possible to transmit operating parameters of the LED module to the LED converter without a specific communication line between LED module and LED converter.
  • the LED module for example, an EPROM, from which the LED converter can determine information regarding the operating parameters to be set on the LED module.
  • the prior art approaches all either require interaction with the LED converter or the LED module, or require additional terminals or components. This increases the cost of the LED module and / or the LED converter. In addition, more space is needed for the components, which prevents a more compact design.
  • the object of the present invention is to improve the known state of the art, especially with regard to the abovementioned disadvantages.
  • it is an object of the present invention to provide an LED converter information eg. Regarding operating parameters of an LED module (back), without additional components or connections, or an interaction are necessary.
  • the objects of the present invention are solved by the features of the independent claims.
  • the dependent claims further advantageously form the core idea of the invention.
  • the invention relates to a system in which information can be transmitted to the LED converter by a generated load or load changes of the LED module.
  • information may be transmitted to the LED converter through a generated load or load changes of the LED module in a preferably timed startup phase.
  • information can be exchanged between the LED converter and the LED module by means of bidirectional communication, wherein preferably the communication from the LED module is transmitted by a generated load or load changes of the LED module.
  • the present invention utilizes the fact that to operate an LED module, in particular to illuminate an LED track of the LED module, a certain forward voltage at the LED track, ie a certain supply voltage at the LED Module is necessary. Below the forward voltage, the LED path blocks. The LED path is thus non-conductive and represents an almost infinite resistance for the LED converter. Only at or above the forward voltage does the LED track represent an active power load for the LED converter. A supply voltage at an LED track, the is not equal to zero but below the forward voltage, defines a voltage window in which the LED path is not yet conductive. This voltage window is used by the present invention to communicate information to the LED converter through a generated load or load changes of the LED module
  • the present invention relates to an LED module comprising: terminals for an LED track, a circuit configured to present a load, preferably an active power load, when a first non-zero supply voltage is applied to the LED module a connected LED path is non-conductive, and which is configured to be no load when a second non-zero supply voltage is applied to the LED module at which a connected LED path is conductive.
  • the load for the voltage window (readout window), in which the LED track is not conductive, causes a power consumption of the LED module.
  • a circuit which is designed to represent a load preferably an active power load
  • the circuit After expiration of the preferably limited time start phase, the circuit may be configured to represent no load.
  • the load for the preferably limited start phase causes a power consumption of the LED module.
  • the present invention relates to an LED module comprising: terminals for an LED track, a circuit configured to represent a load, preferably an active power load, when a first non-zero supply current is supplied to the LED module, and which is designed to represent no load when a second supply current is not equal to the first Supply current is supplied to the LED module or when a preferably limited time start phase has expired.
  • the load for the voltage window (readout window), in which the LED track is not conductive, causes a power consumption of the LED module.
  • This power consumption can be detected by an LED converter and can determine parameters of the LED module based on the detected power consumption. For example, based on stored tables, the LED converter can infer the operating and / or maintenance parameters of the LED module to be set from the detected power consumption.
  • the circuit is preferably configured to be activated each time a supply voltage is applied to the LED module. Furthermore, the circuit is designed to automatically deactivate itself when a preferably temporary start phase has expired or ended. Thus, there is no power loss in the permanent lighting operation of the LED track. To operate the circuit, no additional connections are needed.
  • the circuit may be integrated with the LED module and need not be provided as a separate component. The circuit works automatically after applying a supply voltage, ie a start-up phase, therefore no additional interaction must be carried out.
  • the circuit is preferably configured to be activated each time a supply voltage between zero and the forward voltage of the LED path is applied to the LED module. Furthermore, the circuit is designed to automatically deactivate itself when the applied supply voltage reaches or exceeds the forward voltage of the connected LED route. Thus, no power loss is present in the lighting operation of the LED track. To operate the circuit, no additional connections are needed.
  • the circuit may be integrated with the LED module and need not be provided as a separate component. The circuit works automatically according to the applied supply voltage, so there is no need for additional interaction.
  • a predetermined supply current can also be fed into the LED path for activating the circuit in order to activate the circuit on the LED path.
  • the LED converter may output the nominally minimum output current according to its specification, or a low minimum current value that assures that the LED module will not be overloaded.
  • the circuit is designed to automatically disable itself, for example, when the supplied supply current reaches or exceeds the rated current of the connected LED route or when a preferably limited time start phase has expired.
  • the circuit is designed to represent a current-constant or constant-power load, which causes a constant current consumption or a constant power consumption of the LED module.
  • the circuit is thus a selectively loadable in the readout window of the supply voltage constant load.
  • Such a circuit enables a particularly simple embodiment of the present invention.
  • the circuit is configured to represent a current variable load that causes a change in the power consumption of the LED module according to at least one predetermined protocol.
  • the circuit is preferably designed to code at least one operating and / or maintenance parameter of the LED module by changing the power consumption according to the at least one predetermined protocol. Additionally or alternatively, the circuit on the LED module can also be designed so that it is preferably activated only in a limited startup phase of the LED module.
  • An LED converter can detect the change in the power consumption of the LED module and decode according to the at least one protocol that is stored, for example, in the LED converter. Thus, a communication path from the LED module to the LED converter is made possible without additional lines or pins.
  • Operating parameters of the LED module can be, for example, the forward current of an LED segment of the LED module, the corresponding forward voltage of the LED segment, a nominal current of the LED module, or a spectrum of the light emitted by the LED segment.
  • Maintenance parameters may be, for example, aging parameters of the LED module or the LED route, an operating time duration of the LED module, or a temperature at the LED module.
  • the at least one predetermined protocol specifies a frequency and / or an amplitude and / or a duty cycle of the change in the power consumption of the LED module.
  • the at least one protocol can therefore be coded in many ways, namely with respect to a frequency of the power consumption, an amplitude, and a switch-on. This allows complex information to be encoded. Several different coded protocols can also be used.
  • the circuit is designed such that the change in the power consumption of the LED module is independent of a value of the first supply voltage.
  • the circuit on the LED module thus reproduces the coding parameters (eg amplitude, frequency, duty cycle of the load change) in the readout window (ie supply voltage not equal to zero but below the forward voltage of the LED path) independently of the supply voltage.
  • the coding parameters eg amplitude, frequency, duty cycle of the load change
  • the readout window ie supply voltage not equal to zero but below the forward voltage of the LED path
  • the circuit is designed such that the change in the power consumption of the LED module is effected as a function of a value of the first supply voltage in accordance with one of a plurality of predetermined protocols.
  • the same feedback information is not always transmitted to an LED converter which is connected to the LED module as described above. Rather, the voltage range of the supply voltage at which a connected LED path is not yet conductive can be subdivided into a plurality of subregions of the supply voltage. Each sub-area may be subject to another given protocol. This means that a different change in power consumption can occur in each subrange (i.e., different in the frequency of the power consumption change, the amplitude of the power consumption change, or the duty cycle, depending on the applied supply voltage). This allows different information to be transmitted back to the LED converter.
  • the modulation of the supply voltage for example, the modulation of the supply voltage, a selective switching on and off of the supply voltage between zero and a voltage in the read window, etc. include.
  • frequency modulation, amplitude modulation or PWM of the supply voltage are conceivable.
  • the circuit includes a timer circuit configured to set a frequency of change in the power consumption of the LED module.
  • the timer circuit thus specifies the frequency of the load change of the LED module.
  • the circuit is integrated in a semiconductor material of the LED module. This allows the circuit to be made particularly space-saving and inexpensive.
  • at least one sensor is provided on the LED module, which is designed to influence an electrical parameter of the circuit.
  • the at least one sensor may e.g. a sensor or a combination of multiple sensors, which may be light sensors, temperature sensors, color sensors, etc.
  • the influenced electrical parameter of the circuit on the LED module may be, for example, a resistance value or a conductivity.
  • the at least one sensor is a light sensor with light-dependent resistance and the light sensor is connected to the circuit such that a change in the light-dependent resistor changes the load resistance of the circuit.
  • a light sensor with a light dependent resistor i.e., a "light dependent resistor” is easily implemented, and a light output that falls on that resistor directly affects its resistance and thus also in the readout window the active power load of the circuit.
  • the present invention further relates to an LED converter for an LED module as described above, which is adapted to a power consumption of the LED module for a voltage applied to the LED module first supply voltage, wherein an LED connected to the LED module Is not conductive to detect and determine based on the detected power consumption at least one operating and / or maintenance parameters of the LED module.
  • the necessary information is transmitted to the LED converter to determine the operating and / or maintenance parameters.
  • the LED converter may determine these parameters based on one or more stored or stored tables Operational and / or maintenance parameters correlate with constant or varying power consumption within the readout window.
  • the LED converter is preferably designed to use the at least one specific operating and / or maintenance parameter: to set or regulate the operation of the LED module, store it in an allocated memory, visually and / or audibly indicate it, and / or via to send a wireless or wired interface, if necessary, to an external request.
  • the LED converter is thus suitable for comprehensively controlling the LED module. For this purpose, no separate communication path or additional lines or pins are required between the LED module and the LED converter.
  • the information transmission e.g. the transmission of the operating and / or maintenance parameters, via the existing anyway connections for the supply voltage.
  • the at least one operating and / or maintenance parameter is a desired current through an LED track connected to the LED module, an aging parameter, an operating time duration, and / or a spectrum of a light emitted by the LED track.
  • the LED converter is configured to identify the LED module based on the least one particular operating and / or maintenance parameter.
  • the identification can be carried out, for example, based on one or more stored tables. If the LED converter has identified the LED module, further information can be stored in the one or more tables which allow comprehensive control of the LED module. In particular, a forward current of the LED path of the LED module is advantageous as stored information.
  • the LED converter is designed, by changing the supply voltage of the LED module, for example via a pulse or amplitude modulation of the supply voltage to signal the LED module, selectively in a mode for changing the power consumption of the LED module ( Load change).
  • the modulation of the supply voltage can take different patterns or values, whereby a targeted selection of individual LED modules can be made possible when an LED converter supplies several LED modules.
  • the respective selected LED module in this way can then selectively switch to the mode of load change to transmit information to the LED converter.
  • the plurality of LED modules may be arranged in series connection or parallel connection.
  • the LED converter may be configured to interrogate various types of information from the LED module (s) by changing the supply voltage, for example via pulse or amplitude modulation of the supply voltage, depending on the particular pattern or value.
  • various tables can be stored for the feedback of the various information.
  • the LED converter is configured by selectively setting a first supply voltage or a second supply voltage for the LED module, selectively between a mode for detecting a power consumption of the LED module and a mode for lighting operation of a LED module connected to the LED module. Change track.
  • the first supply voltage is a voltage in the readout window, that is, a supply voltage between zero and a forward voltage at which the connected LED path is not yet conductive.
  • the second supply voltage is a voltage above the forward voltage at which the connected LED line is conductive, preferably lights.
  • the LED converter is thus automatically set based on the set supply voltage in the appropriate mode. A detection of the power consumption takes place only in the aforementioned detection mode. This makes it possible to turn off detection circuits of the converter in lighting mode and save energy. An interaction with the LED converter from the outside is not necessary for changing the mode.
  • the LED converter is adapted to perform a current measurement for directly detecting the power consumption of the LED module.
  • the LED converter is designed to perform an indirect detection of the power consumption of the LED module.
  • the LED converter is adapted to detect a change in the power consumption of the LED module by changing a duty cycle of a clock of the LED converter, for example a buck converter (also called buck converter) or an isolated flyback converter (flyback converter).
  • a buck converter also called buck converter
  • a flyback converter flyback converter
  • the LED converter may also detect a change in the peak current in the LED converter in, for example, an isolated converter, preferably an isolated flyback converter.
  • the LED converter is configured to discharge a capacitor via a load of the LED module, to determine a discharge current of the capacitor directly, or indirectly via a discharge time, and the at least one operating and / or maintenance parameter of the LED module based on this discharge current to determine.
  • this embodiment of the LED converter is preferably used for a LED module with current-constant load in the region of the readout window of the supply voltage.
  • a capacitor in the LED converter is discharged, for example, via a constant current sink on the LED module, wherein the thereby flowing discharge current can be measured directly or indirectly via a discharge rate (negative slope) of the voltage of the capacitor.
  • the directly or indirectly detected discharge current can then be interpreted by the LED converter with regard to the operating and / or maintenance parameter.
  • the information about the operating and / or maintenance parameter is thus encoded in the slope of the voltage that the LED converter outputs when the capacitor is discharged.
  • the measurement of the discharge rate eliminates the dependence on the absolute supply voltage. It is also conceivable to detect the discharge current over the discharge duration of the capacitor. For this purpose, the information about the absolute voltage at the beginning and at the end of the measurement, ie the discharging of the capacitor, can also be present or fed back to the LED converter.
  • the present invention further relates to an LED lamp comprising an LED module as described above and an LED converter as also described above.
  • the present invention further relates to a method of communicating information from an LED module to an LED converter, comprising: activating a circuit to present a load, preferably an active power load, when a first non-zero supply voltage to the LED module is applied, in which a connected LED track is not conductive, and deactivating the circuit to represent no load when a second non-zero supply voltage to the LED module, in which a connected LED track is conductive.
  • the present invention also relates to a method for determining information relating to an LED module on an LED converter, comprising: detecting a power consumption of the LED module for a first supply voltage applied to the LED module, in which one to the LED module Module connected LED track is not conductive, and determine of at least one operating and / or maintenance parameters of the LED module based on the detected power consumption.
  • the present invention further relates to a method for transmitting information from an LED module to an LED converter comprising a high-frequency clocked converter with a transformer comprising a
  • Activation of a circuit at least during a temporary start-up phase to represent a load, preferably an active power load, and a detection of a power consumption of the LED module on the primary side of the transformer of the high-frequency clocked converter.
  • the present invention also relates to a method for determining
  • Information regarding an LED module on an LED converter comprising a high-frequency clocked converter with a transformer, comprising detecting a power consumption of the LED module on the primary side of the
  • a transformer of the high-frequency clocked converter wherein a circuit on the LED module causes a modulated load change at least during a start-up phase, and determining at least one operating and / or maintenance parameter of the LED module based on the detected power consumption.
  • the present invention allows information to be set to an LED module operating and / or maintenance parameters to transmit to an LED converter. No further connections or connection between LED converter and LED module are necessary. There is no further component except a, advantageously in a semiconductor material of the LED module integrated load modulation circuit necessary. There is no need for additional interaction with the LED module or the LED converter for transmitting the information.
  • the present invention enables a simpler control of an LED module, and a cheaper and more compact production of LED module and / or LED converter.
  • the present invention also relates to a method for determining
  • Information regarding an LED module to an LED converter comprising detecting a power consumption of the LED module, wherein a circuit on the LED module, at least during a start-up phase, a modulated load change and determining at least one operating and / or maintenance parameter of the LED module based on the detected power consumption.
  • FIG. 1 shows a circuit that allows automatic deactivation of the circuit on the inventive LED module, shows an example of the circuit on the LED module according to the invention, which is a current-constant load.
  • FIG. 1 shows schematically the detection of a current-constant load on the LED module according to the invention by the LED converter according to the invention.
  • FIG. 1 shows a circuit on the LED module according to the invention, which represents a current variable load and in particular sets a frequency of change in power consumption of the LED module according to the invention.
  • FIG. 1 shows how a change in power consumption of the LED module according to the invention can be measured on a buck converter as an example of an LED converter according to the invention.
  • FIG. 10 shows another example of the circuit on the invention
  • Fig. 11 shows another example of the circuit on the invention
  • Fig. 12 shows another example of the circuit on the invention
  • FIG. 1 schematically shows an LED luminaire according to the invention, which consists of an LED module 1 according to the invention and an LED converter 10 according to the invention.
  • the LED converter 10 is connected to the LED module 1 via one or more voltage connections 12.
  • the LED converter 10 thus supplies the LED module 1 with a supply voltage.
  • the LED converter 10 may also be designed to operate a plurality of LED modules 1.
  • the supply voltage is a DC voltage, but may also be a clocked voltage or AC voltage.
  • the LED converter 10 preferably has a high-frequency clocked converter, for example a buck converter (step-down converter), isolated flyback converter (flyback converter) or a resonant half-bridge converter (preferably isolated, for example an LLC converter).
  • the LED converter 10 may, for example, output a constant output voltage or a constant output current at its voltage terminals 12, the voltage at these terminals corresponding to the supply voltage of the LED module 1.
  • the supply voltage is applied via one or more terminals 2 of the LED module 1 to at least one LED track 3 connected thereto (this also includes a single LED).
  • the LED track 3 does not have to be part of the LED module 1 according to the invention but can be a connectable and exchangeable LED track 3.
  • the LED module 1 according to the invention thus requires only terminals 2 for at least one LED track 3.
  • the LED track 3 can also be permanently installed with the LED module 1.
  • the LED track 3 may have one or more LEDs, which are connected in series, for example, as shown in FIG. LEDs of a LED track 3 can all shine the same color, ie emit light of the same wavelength, or shine in different colors. For example, multiple LEDs, preferably red, green and blue LEDs, may be combined to produce mixed radiation, preferably white light.
  • the circuit 4 is designed, for example, such that it represents a load, preferably an active power load, for the LED converter 10 when the supply voltage applied to the terminals 12 by the LED converter 10 is not equal to zero, but is still low enough for the to the terminals 2 connected LED track 3 is not yet conductive.
  • the circuit 4 can therefore also be referred to as a load circuit or load modulation circuit.
  • Figure 2 shows by way of example a current-voltage characteristic of an LED track 3, in which a current through the LED track in the vertical direction and the voltage on the LED track (i.e., the supply voltage in Figure 1) in the horizontal direction is plotted.
  • a first voltage range ie a first supply voltage 5a within the readout window
  • the voltage across the LED path 3 is not equal to zero, but the current through the LED path 3 is also almost zero, since the LED path 3 is not conducting , The supply voltage is thus below the forward voltage.
  • the LED track 3 represents an infinite load for the LED converter 10.
  • the LED module 1 thus absorbs no power via the LED track 3.
  • a second voltage range i.e., for a second supply voltage 5b outside the readout window
  • the LED track 3 becomes conductive and a current flows through the LED track 3, lighting it up.
  • the supply voltage is thus above the forward voltage.
  • the circuit 4 on the LED module 1 is designed, for example, so that it is activated when the first supply voltage 5a is applied, and thereby represents a load, preferably an effective power load, for the LED converter 10.
  • the circuit 4 is deactivated and does not represent a load for the LED converter.
  • the circuit 4 may represent either a current-constant load or a current-variable load for the LED converter 10.
  • the circuit 4 causes a power consumption of the LED module 1, although an LED track 3 is not yet conductive and does not absorb power. A conventional LED module 1 would not record power in the readout window. Additionally or alternatively, the circuit 4 on the LED module 1 may also be designed so that it is activated only in a limited startup phase of the LED module 1.
  • the power consumption of the LED module 1 in the readout window can be current-constant or current-variable depending on the type of circuit 4.
  • the LED converter 10 can detect the power consumption of the LED module 1 or a change in the power consumption of the LED module 1 and close based on the detected power consumption to be set operating and / or maintenance parameters of the LED module 1.
  • the LED converter 10 can use the operating and / or maintenance parameters directly for setting or regulation of the LED module 1.
  • the LED converter 10 can store the operating and / or maintenance parameters but also in a memory associated with it and optionally later use, or visually and / or acoustically display the parameters to a user, or they to another device, such as a control unit of a lighting system , send.
  • the transmission can be either wireless or wired and can be done either automatically or only upon request from the other device.
  • the LED converter 10 supplies the LED module 1, for example, with a constant supply voltage, preferably a constant DC voltage.
  • a constant supply voltage preferably a constant DC voltage.
  • the LED converter 10 can be operated with reduced compared to the normal operation duty cycle, whereby a lower output voltage is reached.
  • the supply voltage is a first supply voltage 5a, ie it lies in the readout window, which is shown in FIG. Since the first supply voltage 5a is not equal to zero, the circuit 4 is activated on the LED module 1 and constitutes a load for the LED converter 10.
  • the load is preferably an active power load and generates a power consumption of the LED module 1.
  • the LED converter 10 measures a discharging current of a capacitor through this load, an absolute current consumption of the circuit 4, a frequency of a change in the power consumption of the LED module 1, or a duty ratio or an amplitude of a power consumption change. Based on the result of the measurement, the LED converter 10 may conclude operating and / or maintenance parameters. For example, the LED converter 10 may determine a desired or forward voltage or a desired current of the LED module and apply this to the LED module 1. Thus, a connected LED track 3 is conductive and the LED converter 10 operates the LED module 1 in the lighting mode.
  • the circuit 4 is now automatically deactivated. The circuit 4 does not absorb any power in the luminous operation of the LED track 3 and therefore does not affect the lighting operation of the LED track 3. The LED converter 10 of the LED lamp has thus automatically detected the LED module 1 and set the appropriate operating parameters ,
  • a readout of the LED module 1 by the LED converter 10 can be limited in time by the circuit 4 is active only during a start phase due to a predetermined period of time, as soon as a supply voltage to the LED module 1 is applied.
  • this supply voltage can also correspond to the nominal output voltage of the LED converter 10 for normal operation.
  • the circuit 4 is activated on the LED module 1 and represents a load for the LED converter 10.
  • the load is preferably a repeatedly changing active power load and generates a power consumption of the LED module 1.
  • the connected LED section 3 become conductive, whereby the LED converter 10 operates the LED module 1 in the lighting mode.
  • the LED converter 10 may measure, for example, a discharging current of a capacitor through this load, an absolute current consumption of the circuit 4, a frequency of a change in the power consumption of the LED module 1, or a duty ratio or an amplitude of a power consumption change. Based on the result of the measurement, the LED converter 10 may conclude operating and / or maintenance parameters. For example, the LED converter 10 may determine a desired or forward voltage or a desired current of the LED module and apply this to the LED module 1. Preferably, the circuit 4 is then automatically deactivated after the predetermined period for the start phase.
  • this time period for the start 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 4 is deactivated. As a result, the circuit 4 does not absorb any power in the continuous lighting operation of the LED track 3 and therefore does not influence the lighting operation of the LED track 3.
  • FIG. 3 shows a circuit which is at least part of the circuit 4 in order to deactivate it automatically when the supply voltage is in the range of the second supply voltage 5b, ie above the forward voltage of the LED circuit 3.
  • the circuit 4 can be deactivated by means of the transistors M4 and M3. With increasing supply voltage, which is provided by the LED converter 10 and applied to the circuit 4 on the LED module 1, and the voltage across the resistor R8 increases. When this voltage reaches a threshold voltage of the transistor M4, it closes and also deactivates the transistor M3 by setting the gate voltage of the transistor M3 to ground.
  • the threshold voltage may be, for example, 1.4 volts (at a voltage of 12.5 volts) of the LED converter 10).
  • the resistance values should be high, preferably in the range of 20 to 200 kQ, more preferably in the range of 40 to 100 kQ.
  • transistor M3 be configured to withstand the maximum supply voltage that LED converter 10 can provide and that the voltage across resistor R8 not exceed the maximum allowable gate voltage of transistor M4 during normal lighting operation exceeds the LED range 3.
  • this circuit can be designed, for example, by means of an RC element so that it deactivates after a predetermined start time (this time corresponds to the start phase) by deactivating the transistor M3 depending on it, ie opening it.
  • a capacitor may be arranged parallel to the resistor R8.
  • This capacitor can be designed so that it is charged after the predetermined start time by the applied supply voltage and thus the voltage across the parallel resistor R8 has risen so far that this voltage has reached a threshold voltage of the transistor M4, so that it closes and the Transistor M3 is deactivated by setting the gate voltage of the transistor M3 to ground.
  • Figure 4 shows an example of a circuit TL432, which is at least a part of the circuit 4, which is designed to represent a current-constant load for the LED converter 10 in the readout window.
  • the left side of Figure 4 shows a circuit diagram of the circuit, the right side shows a corresponding equivalent circuit diagram for the circuit TL431 or TL432.
  • the constant current is determined by a ratio of the reference voltage of the switching circuit TL431 to the resistance value of the selection resistor RH (Rcfg).
  • a transistor Ql is preferably controlled so that the voltage across the resistor RH (Rcfg) is always about 2.5 volts.
  • a minimum current of about 1 mA should flow through the TL431 circuit.
  • the circuit shown in Figure 3 can be arranged in series with the circuit shown in Figure 4, so that the series circuit of both parallel to the LED track on the LED module 1 is arranged.
  • the virtual ground GNDX of the circuit of Figure 4 is connected to the drain of transistor M3.
  • the LED converter 10 for measuring the constant current, for example, a capacitor 11 discharged.
  • the constant current through the circuit 4 (corresponding to the discharge current of the capacitor 11) may be determined directly or indirectly based on either the discharge duration and / or the discharge rate. Based on the discharge current, the LED converter can be applied to the circuit 4 used and thus Close the connected LED module 1. Furthermore, the LED converter 10 can determine operating and / or maintenance parameters of the LED module, for example based on stored tables.
  • the concept of determining the constant current through the circuit 4 is shown schematically in FIG.
  • the LED converter 10 may be exemplified as a buck converter.
  • the LED converter 10 is provided with the capacitor 11, which may be connected in parallel to the terminals 12 for the supply voltage.
  • the voltage at the terminals 12 is monitored by the LED converter 10.
  • the capacitor 11 discharges via the preferably current-constant load is represented by the circuit 4 on the LED module 1.
  • the discharge rate ie the change in the voltage of the capacitor, which is applied to the terminals 12, is preferably measured by the LED converter 10 to close as described on the operating and / or maintenance parameters of the LED module 1.
  • the resistance RH, the current-constant load shown in Figure 4 can be determined when the capacitance of the capacitor 11 is known.
  • FIG. 6 shows a circuit TLC555, which is at least part of the circuit 4 and is suitable for generating a load change of the LED module 1 with a specific frequency, ie a change in the power consumption of the LED module 1.
  • a circuit diagram On the left side of Figure 6 is a circuit diagram, on the right side, a corresponding equivalent circuit diagram for the circuit TLC555 is shown.
  • a capacitor Cl can be charged and discharged between 1/3 and 2/3 of the supply voltage 5a applied by the LED converter 10.
  • a duty cycle (duty ratio) of the load change or an amplitude of the load change ie, a difference between a load before and a load after the change.
  • This also requires a change in power consumption with a corresponding frequency, duty cycle (duty ratio) or amplitude.
  • the frequency f of the change is defined as
  • R3, R4 and Cl are resistance values of the components shown in FIG.
  • the duty ratio (clock ratio) is defined by the ON time (T h i gh ) and the OFF time (T low ), where
  • Thigh (R3 + R4) C1 ln (2)
  • a change in the duty ratio is possible both by a change in the pulse duration (switch-on time, ON time, T h ig h ) and by a change in the pause duration (OFF time, OFF time, T low ).
  • the magnitude of the load is determined by the resistance R5 and the converter voltage VCO N V (more precisely the ratio VCO N V R5).
  • the circuit 4 may for example be designed so that it is activated only during the start phase of the LED light. This can be achieved, for example, that the supply of the circuit TLC555 by means of a timer such as an RC element, for example, this timer can be designed so that only for a time of, for example, 100 milliseconds the supply for the circuit TLC555 is applied and thereafter a charging of the capacitor of the RC element via a series resistor (starting from the supply voltage of the LED module 1) a predetermined voltage level is reached, which is used to switch off the supply voltage Vcc for the circuit TLC555 leads (example not shown).
  • a timer such as an RC element
  • this timer can be designed so that only for a time of, for example, 100 milliseconds the supply for the circuit TLC555 is applied and thereafter a charging of the capacitor of the RC element via a series resistor (starting from the supply voltage of the LED module 1) a predetermined voltage level is reached, which is used to switch off the supply voltage V
  • the voltage dropping across the RC element may drive the base of a turn-off transistor (not shown) which pulls supply Vcc for circuit TLC555 to ground once the RC element has been charged.
  • the charging time of the RC element can be designed so that a time of, for example, 100 milliseconds is reached, this time corresponds to the starting phase.
  • a start of the circuit TLC555 at the beginning of the start phase can be done by a high-impedance supply directly from the supply voltage of the LED module 1, which at the end of the start phase by means of the voltage drop across the RC element via the turn-off transistor in a kind of pull-down configuration Mass is pulled.
  • the circuit 4 may comprise a controllable switch which switches the resistor R5 on or off depending on the output signal OUT of the circuit TLC555 and thus causes the load change.
  • the circuit shown in Figure 3 can be arranged in series with the circuit shown in Figure 6, so that the series circuit of both parallel to the LED track on the LED module 1 is arranged.
  • the virtual ground GNDX of the circuit of Figure 6 is connected to the drain of transistor M3.
  • a capacitor can be arranged parallel to the resistor R8. In this case, an RC element is also formed.
  • the charging time of the RC element can be designed so that a time of, for example, 100 milliseconds is reached, this time corresponds to the starting phase.
  • the voltage at the gate of the transistor 4 has reached a threshold voltage of the transistor M4, so that it closes and the transistor M3 is deactivated by setting the gate voltage of the transistor M3 to ground. In this way, the circuit of Figure 6 can be activated only for a predetermined start phase.
  • a repetitively changing load change ie a modulated load change
  • two for example, can also be generated various information is transmitted.
  • a first information for example, the target voltage
  • a second information for example, the target current
  • a further possibility for combined transmission of at least two pieces of information would be the corresponding change in the pulse duration (on period, ON time, Thi g h) and the pause period (off period, OFF time T low) of the load change.
  • the change in the power consumption of the LED module 1 can be determined by the LED converter 10, for example, by direct current measurement of the current through the circuit 4.
  • the LED converter 10 may perform measurements on a buck converter as shown in FIG. 7, the buck converter preferably being a part of the LED converter 10.
  • Figure 8 shows how the current through the circuit 4 and the current on the buck converter measured across a shunt correlate.
  • FIG. 8 shows, above, the current "load current” through circuit 4 and the current "inductor current” plotted against the time by buck converters.
  • the buck converter is only an exemplary example of a high-frequency clocked converter, alternatively, for example, an isolated flyback converter, boost converter (boost converter) or a resonant half-bridge converter (preferably isolated, for example, a LLC converter) for powering the LED Modules 1 are applied.
  • boost converter boost converter
  • resonant half-bridge converter preferably isolated, for example, a LLC converter
  • the LED converter may have a buck converter as shown in FIG.
  • the buck converter can be operated as a constant current source, ie regulate to a constant output current.
  • the output voltage of the Buck converter so the voltage that is output at the output of the LED converter 10 and the voltage across the LED module 1 corresponds, are detected and evaluated.
  • the duration of the on-time and the off-time of the control of the high-frequency clocked switch of the Buck converter can be monitored and evaluated to a To detect load change and thus read information from the LED module 1.
  • the buck converter can also be operated as a constant voltage source, so regulate to a constant output voltage.
  • a load change on the LED module 1 will lead to a change in the peaking current occurring through the high-frequency clocked switch during the switch-on phase of the high-frequency clocked switch of the buck converter, which change can be detected.
  • the duration of the on-time and the duty cycle of the control of the high-frequency clocked switch of the Buck converter can be monitored and evaluated to detect a load change and thus read information from the LED module 1.
  • the level of the output current can also be evaluated in order to detect a load change.
  • the buck converter can be operated with a fixed duty cycle at a fixed frequency, preferably in a non-clipping current mode (continuous conduction mode). In such an operation, the magnitude of the output current and / or the output voltage can be evaluated to detect a load change.
  • the buck converter of the LED converter 10 can supply the LED module 1, for example, in a starting phase with a constant supply voltage, preferably a constant DC voltage.
  • the buck converter is operated in the starting phase as a constant voltage source.
  • the LED converter 10 can be operated with a reduced duty cycle compared to normal operation, whereby a lower output voltage is achieved.
  • the supply voltage can be a first supply voltage 5a, ie it can lie in the readout window, which is shown in FIG.
  • the buck converter can also supply the LED module 1 with a regulated current in a starting phase, then the buck converter is preferably operated as a constant current source.
  • Figure 8 shows an enlarged view of this plot below.
  • a peak current at the shunt of the buck converter or also a change in the pulse duty factor at the buck converter.
  • the change in the load of the circuit 4 or the power consumption of the LED module 1 can be detected directly on the shunt at the low-potential switch of the Buck converter. Either by a periodic change of the duty cycle or a periodic change of the peak current, which correlates with a periodic change of the power consumption of the LED module 1.
  • the LED converter 10 can have, for example, an insulated converter with a transformer for high-frequency energy transmission (isolated, preferably an insulated flyback converter) for supplying the LED module 1.
  • an insulated converter for high-frequency energy transmission
  • the detection of the load change by the LED converter 10 can also take place on the primary side of the LED converter 10.
  • the current on the primary side of the LED converter 10 flowing through the primary side of the transformer can be detected.
  • the current through the clock switch which is arranged in series with the primary winding of Trasnformators, or the current through the primary winding of the transformer, preferably by means of a series-connected shunt (Strommeßwiderstandes) are detected.
  • a series-connected shunt Stringommeßwiderstandes
  • the applied load or the load change of the LED module 1 and thus, for example, a change in the duty cycle on the primary side of the LED converter 10 can be measured.
  • the change in the primary-side current over time can be detected.
  • a detection of the power transmitted from the primary side based on the measurement of the primary-side current and a measurement or at least the knowledge of the voltage supplying the converter respectively.
  • the converter prefferably preceded by an active power factor correction circuit, such as a boost converter circuit, which provides the input voltage for the high-frequency clocked, isolated converter, such as the isolated flyback converter, and regulates it to a predetermined value.
  • an active power factor correction circuit such as a boost converter circuit
  • This predetermined value for the input voltage controlled by the active power factor correction circuit for the high-frequency clocked converter is known on the basis of the specification (for example via a voltage divider) and can thus be taken into account in the detection of the power transmitted from the primary side.
  • the LED converter can have an isolated flyback converter.
  • the isolated flyback converter can be operated as a constant current source, so regulate to a constant output current.
  • the output voltage of the isolated flyback converter so the voltage that is output at the output of the LED converter 10 and the voltage across the LED module 1 corresponds to be detected and evaluated.
  • This output voltage can be detected directly or indirectly, for example by means of a measurement of the voltage across a primary-side winding of the transformer of the isolated flyback converter.
  • the duration of the turn-off of the control of the high-frequency clocked switch of the isolated flyback converter can be monitored and evaluated to detect a load change and thus read information from the LED module 1.
  • the isolated flyback converter can also be operated as a constant voltage source, so regulate to a constant output voltage.
  • a load change on the LED module 1 will result in a change in the output current, which change can be detected.
  • This change of the output current may, for example, result in a change in the peaking current occurring through the high-frequency clocked switch during the switch-on phase of the high-frequency clocked switch of the isolated spear converter.
  • the monitoring of the primary-side current through the high-frequency clocked switch can thus Monitoring a load change can be used to read information from the LED module 1 thus.
  • the isolated flyback converter can also be operated with a fixed duty cycle at a fixed frequency. In such an operation, the magnitude of the output current and / or the output voltage can be evaluated to detect a load change. If only the LED track of the LED module is active, then the output voltage will take on the value of the forward link voltage of the LED track. If a load change occurs through the circuit 4, then the output voltage will drop. This change can be recorded as a load change.
  • the LED converter can have an isolated resonant half-bridge converter such as, for example, a so-called LLC converter.
  • the LLC converter can be operated as a constant current source, ie regulate to a constant output current.
  • the output voltage of the isolated flyback converter so the voltage that is output at the output of the LED converter 10 and the voltage across the LED module 1 corresponds to be detected and evaluated.
  • This output voltage can be detected directly or indirectly, for example by means of a measurement of the voltage on a primary-side winding of the transformer of the LLC converter. If only the LED track of the LED module is active, then the output voltage will take on the value of the forward link voltage of the LED track. If a load change occurs through the circuit 4, then the output voltage will drop.
  • This change can be recorded as a load change.
  • the clock frequency of the LLC converter which adjusts itself due to the control loop can also be monitored and evaluated in order to detect a load change and thus to read out information from the LED module 1. If the control loop of the LLC converter is designed such that a frequency stop of the drive of the half-bridge of the LLC converter is achieved during the load change by the circuit 4, this can also be evaluated in order to read out the information.
  • the isolated resonant half-bridge converter, such as LLC converter can also be operated as a constant voltage source by operating at a fixed frequency, the frequency being chosen such that the resulting voltage at the output is below the value of the LED line's forward voltage.
  • a load change on the LED module 1 will result in a change in the output current, which change can be detected.
  • This change of the output current can for example take place on the secondary side of the LLC converter and be transmitted to the primary side by means of a coupling element such as a current transformer.
  • the monitoring of the output current can thus be used to monitor a load change, thus reading information from the LED module 1.
  • the LED converter 10 is operated, for example in a start-up phase in a particular mode, for example in a fixed-frequency mode or as a power source or voltage source to detect a load change and thus read out information of the circuit 4, for example, according to at least one protocol is transmitted.
  • the circuit 4 can also have a digital control unit IC1 which is designed to output various types of modulated signals as a preferably modulated load change, for example also a specific pulse sequence as a digital coding (sequence of zeros and ones).
  • the LED converter 10 may be designed to query various types of information, ie different operating parameters and / or maintenance parameters of the LED module 1 by a change in the supply voltage and also selectively query one of a plurality of LED modules.
  • the change in the supply voltage can be effected, for example, by means of a low-frequency (in the range of a few hertz up to one kilohertz) or high-frequency modulation (in the tens or hundreds of kilohertz or up to the megahertz range).
  • the digital control unit ICl of the circuit 4 may be implemented as an integrated circuit.
  • the integrated circuit may be implemented as an integrated control circuit with only three or four terminals.
  • the digital control unit ICl would have a first terminal Vp connected to the supply voltage of the LED module 1 ( Figure 9). Via this first connection Vp, the digital control unit ICl can detect the supply voltage of the LED module 1 by means of the first analog-digital converter A / D1 connected to this connection Vp.
  • a second terminal Vn is connected to the ground of the LED module 1 and allows an internal ground connection within the digital control unit ICl.
  • a third terminal Vdd may be connected to a capacitor which is also connected to its other terminal to ground of the LED module 1.
  • the second terminal Vp may be internally connected to the first terminal Vp via a diode and a switch Svdd.
  • This switch Svdd can be compared to a reference value Ref by means of a comparator Compl, depending on a comparison of the voltage currently present at the terminal Vdd.
  • the switch Svdd may be turned on by the drive unit VddCtrl when the actual value of the voltage at the terminal Vdd is smaller than the reference value Ref.
  • a current flows into the capacitor connected to the third terminal Vdd.
  • the voltage applied to the third terminal Vdd can be used as an internal power supply for the digital control unit ICl.
  • the terminal Vdd serves in this case to stabilize the internal power supply of the digital control unit ICl.
  • the digital control unit ICl can be pre-programmed according to this example, for example during the manufacture or assembly of the LED module 1. This programming of the digital control unit ICl can for example specify an operating parameter of the LED module 1, such as the desired current or the setpoint voltage.
  • a switching element S6 is integrated, which corresponds in function to the switch 6 of the example of FIG. 1 and is adapted to output preferably as a modulated load change at least one modulated signal or different types of modulated signals.
  • the voltage at the first terminal Vp is internally connected by closing the integrated switching element S6 to the second terminal Vn directly or indirectly, for example via an integrated resistor R6, and thus pulls the voltage at the terminal Vp to a lower potential.
  • the modulated signal may be a particular pulse train and output as a digital encoding (sequence of zeros and ones).
  • the digital control unit ICl thus, for example, in a startup phase (ie a temporary start phase of the LED converter and LED module 1) transmit information, preferably in accordance with the at least one protocol, for example, in the LED module 1 and is stored in the LED converter 10.
  • the current through the switching element S6 can be monitored by means of the resistor R6, wherein the switching element S6 can be opened when the current through the switching element S6 and thus the resistor R6 becomes too large.
  • the detection of the voltage drop across the resistor R6 and thus of the current flowing therethrough can be effected by means of a second analog-to-digital converter A / D2.
  • the readout and evaluation of the two analog-to-digital converters and the activation of the switching element S6 can be done by a control block "Config and Com" integrated into the digital control unit ICl
  • the digital control unit IC1 can also be integrated with a sensor system for detecting the temperature, whereby the digital control unit IC1 can transmit as maintenance parameter an excess temperature or an operating temperature as information according to the at least one protocol to the LED converter
  • the digital control unit ICl can be configured to output an aging parameter of the LED module or the LED route or an operating period of the LED module as a maintenance parameter.
  • the digital control unit ICl can also detect an overvoltage on the LED module 1 and output a corresponding error message as a maintenance parameter.
  • the LED path of the LED module 1 can be bridged and thus protected from the overvoltage.
  • FIG. 10 shows an embodiment of the four-port digital control unit IC1.
  • the digital control unit ICl has a fourth terminal Cfg, to which a configuration element such as a resistor Rcfg (selection resistor RH) may be connected.
  • a controllable current source Icfg can be internally connected to this fourth terminal Cfg.
  • the voltage drop across the resistor Rcfg which results from the current supplied by the controllable current source Icfg and the resistance value of the resistor Rcfg, can be controlled by the control block "Config and Com" of the digital control unit ICl via a third analog-to-digital converter A /
  • This detected voltage at the fourth terminal Cfg may specify an operating parameter of the LED module 1, such as the desired current or voltage, for example, a temperature-dependent resistor may optionally be arranged between the fourth terminal Cfg and the third terminal Vdd Temperature-dependent resistance may be designed such that its resistance changes greatly in the event of an excess temperature on the LED module 1, which also changes the voltage at the fourth terminal Cfg
  • This change can be detected by the digital control unit IC1 and can be identified, for example, as Maintenance parameter an exceeded emperature be transmitted as information according to the at least one protocol to the LED converter.
  • the controllable current source Icfg can be active, for example, only at the start of the digital control unit ICl to read the value of the Widerertandes RH, while in continuous operation of the LED module 1, only the over the voltage divider from temperature-dependent resistance and resistance RH resulting voltage for detecting an overtemperature is monitored.
  • the switch is not designed as an integrated switching element S6 but as an external switch 6 analogously to the example of FIG.
  • This switch 6 is driven via a fifth terminal Sdrv by the digital control unit IC1.
  • a resistor R6 is arranged in series with the switch 6, arranged. The current through the resistor R6 can be detected and monitored by means of the voltage drop across the resistor R6 by means of a sixth terminal Imon by the digital control unit IC1.
  • Fig. 12 shows another embodiment of the digital control unit IC1.
  • This example like the example of FIG. 10, has the terminals Vp, Vn and Vdd.
  • the fourth terminal Cfg is present, at this in turn, a resistor RH (Riled) is connected as a configuration element.
  • the digital control unit IC1 has two further connections. Connected to another terminal Vovt is a resistor Rovt, which is a temperature dependent resistor. By monitoring the resistance of this resistor Rovt an overtemperature can be detected.
  • a further controllable current source can be arranged in the digital control unit IC1, which outputs a current at the further terminal Vovt, which flows into the resistor Rovt.
  • the digital control unit IC1 can detect an excess temperature on the LED module 1.
  • a current can be fed into the temperature-dependent resistor Ritm connected thereto via a further controllable current source at the further terminal Vitm, and the digital control unit IC1 can be fed to the current control unit, which is monitored on the basis of the detected voltage at this terminal Vitm Close operating temperature on the LED module 1.
  • this information can be transmitted as information as well as an excess temperature as information in accordance with the at least one protocol to the LED converter.
  • the information about the operating temperature can be evaluated by the LED converter, with an intelligent feedback control of the current through the LED module 1 can be done without an excess temperature must be achieved.
  • the switch 6 or the switching element S6 can perform further functions on the LED module 1, which can be controlled by the digital control unit IC1. For example, afterglow protection can be enabled.
  • the digital control unit IC1 can detect, for example, when the LED module 1 is to be switched off or has already been switched off by switching off the supply voltage. In order to avoid parasitic effects or residual charges coupled-in voltages, the switch 6 and the switching element S6 can be closed to prevent glowing of the LED due to the coupled voltages.
  • a protection of the LED module 1 against overvoltages can be made possible by overvoltage at the supply input of the LED module 1, the switch 6 and the switching element S6 is at least temporarily closed to reduce the overvoltage or the LED protect.
  • a protection against overvoltages when disconnecting the LED module 1 from the LED converter during operation of the LED module 1 can be made possible, as a so-called "hot-plug" protection ..
  • Such a separation can both unintentionally by a sudden contact interruption in the supply line or by a user error by an intervention, such as a change of the LED module 1 during operation occur.
  • the LED converter 10 by a selective change of the supply voltage for the LED module 1, a change of the LED module bring about a communication mode, and then the LED converter 10 can detect the change in the power consumption of the LED module 1 and decode according to the at least one protocol, which is stored for example in the LED module 1 and the LED converter 10.
  • the LED converter 10 can query various information from the LED module 1, wherein for each query a specific protocol h can be intermittent.
  • a bidirectional communication path between the LED module and the LED converter is made possible without additional lines or pins.
  • the change in the power consumption of the LED module 1 may be effected in accordance with a value of the first supply voltage 5a in accordance with one of a plurality of predetermined protocols and thus a different load change may be effected according to one of a plurality of predetermined protocols.
  • determining a current-constant load wherein the constant current can be measured, for example via a discharge rate of a capacitor on the LED converter 10.
  • determining a frequency of the change in the power consumption of the LED module 1 for example by directly detecting the current on the converter side.
  • indirectly detecting by determining a peak current within the LED converter which has, for example, an isolated flyback converter or buck converter measured across a shunt. The peak current follows the change in the power consumption of the LED module 1.
  • the present invention proposes to transmit information from an LED module 1 to an LED converter 10, which can be concluded on set to the LED module 1 operating and / or maintenance parameters.
  • the operating parameter to be set can be, for example, the setpoint current or the setpoint voltage.
  • a circuit 4 load modulation circuit
  • a circuit 4 is provided, for example, in a voltage range of a first supply voltage 5a, which is not equal to zero and in which a connected to the LED module 1 LED track 3 is not conductive, a Represents load for the LED converter, and in a voltage range of a second supply voltage 5b, which is not equal to zero and in which a connected LED line 3 is conductive, no load for the LED converter 10 represents.
  • the circuit 4 may also be activated only temporarily, preferably only during a start phase of the LED light.
  • the load may be constant or repeatedly variable (modulated), for example according to a predetermined protocol. For example, a modulated load change can take place, for example according to a predetermined protocol.
  • the power consumption can be detected by the LED converter 10, in particular also a change in the power consumption (amplitude, frequency, duty cycle). As a result, the LED converter 10 can determine the operating and / or maintenance parameters. The transmission of this information between the LED module 1 and the LED converter 10 requires no additional connections (only the connection of the supply voltage). In addition, no interaction with LED module 1 and / or LED converter 10 is necessary. This improves the disadvantages of the known art.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

L'invention concerne un module à LED (1) comprenant : - des bornes (2) destinées à une section de LED (3); - un circuit (4) qui est conçu pour représenter une charge, de préférence une charge de puissance active lorsqu'une première tension d'alimentation (5a) différente de zéro est appliquée au module à LED (1), qui est dimensionnée de telle sorte que lors de la connexion d'une section de LED celle-ci est non-conductrice, et qui est conçu pour représenter l'absence de charge lorsqu'une seconde tension d'alimentation (5b) différente à zéro est appliquée au module à LED (1), pour laquelle lors de la connexion de la section de LED (3) celle-ci est conductrice et émet de la lumière, le type de variation de charge étant choisi en fonction de la valeur de la première tension d'alimentation et/ou d'une modulation de la première tension d'alimentation.
PCT/AT2014/050283 2013-11-28 2014-11-26 Module à led WO2015077812A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US15/038,564 US10397993B2 (en) 2013-11-28 2014-11-26 LED module
EP14830495.9A EP3075213B1 (fr) 2013-11-28 2014-11-26 Module à led
CN201480065319.0A CN105794315B (zh) 2013-11-28 2014-11-26 Led模块

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ATGM401/2013 2013-11-28
AT4012013 2013-11-28
ATGM445/2013 2013-12-16
ATGM445/2013U AT14906U1 (de) 2013-11-28 2013-12-16 LED-Modul

Publications (2)

Publication Number Publication Date
WO2015077812A2 true WO2015077812A2 (fr) 2015-06-04
WO2015077812A3 WO2015077812A3 (fr) 2015-07-30

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PCT/AT2014/050283 WO2015077812A2 (fr) 2013-11-28 2014-11-26 Module à led

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EP (1) EP3075213B1 (fr)
CN (1) CN105794315B (fr)
WO (1) WO2015077812A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3758451A1 (fr) * 2019-06-26 2020-12-30 Marelli Automotive Lighting Reutlingen (Germany) GmbH Agencement de circuits d'un dispositif d'éclairage et dispositif d'éclairage doté d'un tel agencement de circuits

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EP3075213B1 (fr) 2019-01-09

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