EP3666042A1 - Dispositif et procédé servant à limiter de manière dynamique la surcharge pour des systèmes à del multicanaux à température de couleur variable - Google Patents

Dispositif et procédé servant à limiter de manière dynamique la surcharge pour des systèmes à del multicanaux à température de couleur variable

Info

Publication number
EP3666042A1
EP3666042A1 EP18768863.5A EP18768863A EP3666042A1 EP 3666042 A1 EP3666042 A1 EP 3666042A1 EP 18768863 A EP18768863 A EP 18768863A EP 3666042 A1 EP3666042 A1 EP 3666042A1
Authority
EP
European Patent Office
Prior art keywords
channel
led
current
power
values
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP18768863.5A
Other languages
German (de)
English (en)
Other versions
EP3666042B1 (fr
Inventor
Christian Nesensohn
Sascha GSTIR
Clemens KUCERA
Frank Lochmann
Patrick MARTE
Markus Mayrhofer
Harald Netzer
Oliver Wynnyczenko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and 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
Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP3666042A1 publication Critical patent/EP3666042A1/fr
Application granted granted Critical
Publication of EP3666042B1 publication Critical patent/EP3666042B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the invention relates to a device and a method in the region of a preferably two-channel LED module, wherein both channels can be controlled separately from each other to achieve a Farbtemperaturdimmen.
  • Previous devices for dual channel color temperature dimming are mostly LED systems that have a group of cool white and a group of warm white LED elements typically on a common chip, i. are applied to a single substrate.
  • the device comprises a current driver which generates a first and a second drive current.
  • the first drive current causes the illumination of a first group of LED chips with a first color temperature and brightness (intensity).
  • the second drive current causes the illumination of a second group of LED chips having a second color temperature and second brightness.
  • the color different LED groups or elements may also be mixedly arranged on the substrate.
  • said apparatus and method implemented thereby comprises separately controlling both drive currents such that user-desired light results in a selected color temperature at a selected intensity.
  • the driver circuit of this device has, inter alia, a controller, a memory and, apart from the current driver, also a data bus and a sensor interface which has a plurality of CPUs, processors, gates, arrays, hardware logic and memory documents, such a device is also suitable Computer program product provided by the method of color dimming is implemented.
  • the driver circuit of this device has a circuit arrangement configured to generate drive currents (first and second drive currents) capable of driving both the first and second groups of LEDs from their respective off state to control the state of their maximum intensity.
  • the driver circuit currently sets the levels of the first and second drive currents on the basis of user input (via an interactive display, keyboard, rotary or slider, etc.) and / or based on sensor-based feedback, which is why this circuit does not represent control in the true sense, but a regulation.
  • the resulting light emitted by the entire LED system is ultimately a combination of color temperature and intensity of light at that color temperature.
  • the LED system is not limited to only two groups of LED chips, but can have any number of LED groups, each with their own individual color temperature and brightness behavior. Necessary is a corresponding number of drive currents (depending on the encapsulation), which must be provided by the driver circuit available.
  • the control either picks up in a memory stored drive current tables or calculates the required values of respective drive currents based on algebraic equations themselves.
  • the mixing color temperature (T m i SC h) resulting from the superposition of the light of two LED groups can be determined according to the following equation:
  • T K and Tw are the respective color temperatures that may be measured by sensors.
  • the difference in color temperature between both groups of LED chips should advantageously be at least 300 Kelvin.
  • the above equations allow the controller to compute all drive currents to achieve a desired (physically possible) color temperature with an equally desired brightness (intensity) and to supply the resulting parameters to the drive current table (color temperature, two intensity levels) to complete them.
  • the drive current tables for example, stored in memory during device manufacture, are accessible to the control or the corresponding modules of the driver circuit via the data bus. Or, the drive current tables are stored by the processor by taking information from another device, e.g. is detected via a network connection.
  • the drive currents are set to constant currents at predetermined voltage levels.
  • (Activation) defines current amplitudes of the drive currents which are pulsed at a selectable pulse rate.
  • the respective drivers receive drive current parameters (e.g., from the controller) and use them to generate the corresponding drive currents.
  • Device indicators which measure color temperature and intensity of the light currently emitted by the light source, provide feedback to the driver circuit and form part of the basis for the overall control.
  • the change of the intensity and / or the color temperature of the light emitted by a light source due to a User input and / or timing indicators, environmental indicators, and device indicators (including physical parameters involved in drift) are generally referred to as "dimming.”
  • dimming with, for example, only two LED groups of different color temperature (e.g., cool white and warm white) and intensity is very complex.
  • the luminous flux of a white LED is proportional to its driving current, the proportionality constant being dependent on the color temperature and assuming that all other factors are equal.
  • a LED configured as a 6ooo Kelvin cold white source generates light at the rate of 10 lumens per ampere, while a 300oK warm white source generates light at only a rate of 70 lumens generated per amp. This inequality must be taken into account when dimming (in particular when calculating the drive currents).
  • PWM Pulse Width Modulated Dimming
  • the LED current is somewhat chopped and controlled by varying the duty cycle.
  • the dimmer scales the amplitude of the LED current in a constant manner. The dimmer can thus reduce the AC power to produce an AC voltage resulting in a reduced (second) drive current.
  • analogue dimming is advantageous since several PWM dimming signals generate so-called beat frequencies, ie they can produce beats that cause flickering or audible noise.
  • Analog dimming but also to realize PWM dimming is done in a simple way with a buck converter. It is even proposed in the prior art to use a suitable integrated circuit (IC) (see Jon Kraft, "Convert a Buck Regulator into a Smart LED Driver, Including Dimming;” www.analog.com/en/analog-dialogue/articles/convert- a-buck-regulator.html), for example the ADP2384 or the ADP2441 of the company ANALOG DEVICES. A Texas Instruments datasheet suggests dimming with the TPS92075 integrated circuit.
  • IC integrated circuit
  • a buck converter is a form of switching DC-DC converter and serves to transfer electrical energy between an input and an output side of galvanically isolated DC voltages.
  • the output voltage U a is always smaller than the amount of the input voltage U e .
  • FIG. 1 shows a simple variant of a buck converter 1.
  • a switch 2 is regularly turned on and off by a controller (not shown). Usually, several hundred to several million switching cycles per second, which is why this switch 2 is usually a transistor. When switch 2 is closed, electrical energy is transmitted from U e (on the left connected voltage source) to the right-connected load 7 (here an LED or an LED system).
  • Both the coil 4 (throttle) and the electrolytic capacitor 6 (ELKO) serve as energy storage and allow a supply of the load 7 in the phases in which the switch 2 is opened.
  • the load current flows through the coil 4 and through the load 7, here an LED.
  • the diode 3 locks.
  • the energy stored in the coil is reduced: the current through the load 7 (LED) and through the resistor 5 continues to flow, but now from the capacitor 6 through the diode 3.
  • the switching cycle of the switch 2 can either be set so that the coil current never stops flowing (non-latching operation) because the switch 2 is already closed again before the entire energy stored in the coil 4 is completely dissipated.
  • the switching cycle can also be set so that the current during the cycle 'regularly drops to zero and currentless or voltage-free intervals occur (intermittent operation).
  • a controller In order to be able to precisely control both modes of operation or their transition from both sides, a controller must be used in the design of the circuit, through which all, at least the most important, sometimes rapidly changing parameters (inductance, switching frequency, input voltage, output voltage, flowing current) Output current, output voltage dependence on the duty cycle, etc.) can be taken into account.
  • IC integrated circuit
  • PWM pulse width modulation
  • the present invention now relates to multi-channel LED modules, in particular two-channel LED modules, which preferably have a cold white and a warm white channel, and which can be controlled separately from each other so that a color dimming can be achieved with a simultaneous brightness dimming ,
  • a high-precision control of the respective LED current is necessary, the difficulty being essentially that of not exceeding the maximum power which a single channel is allowed to perform during the dimming process, otherwise
  • the LED module before overloading is completely switched off (English, system shut down).
  • Another prior art method of protecting a multichannel dimmable system from electronic overstressing / overloading is a significant power limitation for each channel.
  • the invention is therefore based on the object for a color temperature and brightness dimmable two- or multi-channel security measures no maximum risk for the technical safety of the system caused by a maximum caused by dimming emerging Ausst Roaden the color temperature and brightness range.
  • FIG. 1 shows a simple embodiment of a buck converter.
  • Figure 2 shows the circuit diagram of a color and brightness dimmable two or more channel system according to the present invention.
  • the basic idea of the present invention is to provide a dynamic overload limitation in color temperature and / or brightness dimmable two- or multi-channel LED systems which protects the system from power overflow in individual channels or in all channels and possibly one prevents damage to the environment or even destruction.
  • a “dimmer” in the most general sense is used to control the (variable) power consumption of (electrically operated) consumers
  • the type of dimming depends on the type of load or its load characteristics.
  • variable (s) to be changed depends on several potentially interactively interacting parameters, a control may not be sufficient for the dimming process, but a regulation is necessary.
  • LED groups of different color temperature for example, cold white and warm white
  • the user has two interfaces (button with display, knob, slider, etc.): one for setting the color temperature and one for adjusting the brightness at this selected color temperature.
  • the system has suitable sensors (for example brightness sensors, color temperature sensors, etc.) which, if necessary, register changes in the lighting conditions of the environment and allow the system to react dimmingly according to its configuration.
  • sensors for example brightness sensors, color temperature sensors, etc.
  • any dimming according to the above statements is technically not feasible, since - for safety reasons - the maximum power of each channel, but also the total power of all channels of the entire system must not be exceeded.
  • Such a channel is called a "master channel" in the present invention.
  • One of the objects of the invention is to implement a current limitation for the second non-master channel (or for further non-master channels).
  • a two-channel system is considered without restriction of generality.
  • the "master channel” can be driven with a power P_Ki in a range between minimum and maximum power, with its maximum power corresponding to the maximum power P_system of the overall system.
  • the maximum power of the second channel P_K2 now depends on the load of the first channel. It can only be the admissible total power minus the currently measured power of the first channel:
  • the power of the first channel P_Ki must be determined technically-physically. As soon as the maximum power of the second channel P_K2 is known, this also leads to a current limitation I max, which is determined as follows:
  • P_K2 U_K2 ⁇ ⁇ Di m value ⁇ selected current
  • the dimming value Since the selected current is a fixed value, only the dimming value has to be limited.
  • the maximum current is therefore limited to Imax so as not to exceed the rated output of the system.
  • One measure that prevents this is to recalibrate the current value for the first channel (the master channel) after limiting the current value for the second channel so that, overall, the brightness of the system decreases but the desired color coordinate of the mixed light is maintained becomes.
  • the voltage across the second channel U_K2 (the voltage across the second LED path) in the device (system) is measured (in the case of a 2-channel system).
  • This measurement results in the permissible maximum current through the second channel I max , which in turn can be expressed as a dimming value.
  • the power of the first channel P_Ki - the maximum permissible sum power P_system is known - and the voltage across the second channel U_K2 must be detected in order to determine the information of the maximum permissible current I max in the second channel.
  • any Nth channel may be used as the master channel.
  • Fig. 2 shows a dimmable 2-channel LED system.
  • the preferably software-based part (for example microcontroller) 8 of the system is shown, on the right side the part, which is preferably embodied in hardware, in the form of FIG 2 LED drivers ⁇ , 9B each for two LED paths, for example with a cold white diode 16A in channel 1 and a warm white diode 16B in channel 2, and both driven by a converter 13A, 13B, preferably by a buck Converter as shown in Figure 1.
  • Each LED driver unit 9A, 9B also contains in each case two resistance paths arranged parallel to one another, against which in each case the actual values of the LED-side voltage U_Ki, U_K2 and / or the current one are respectively connected to a voltage measuring device 14A, 14B and to a current measuring device 15A, 15B LED-side current ⁇ _ ⁇ , I-K2 are measured and the measurement results 17A, 17B, 18A, 18B a control unit 11, for example.
  • the setpoint values igA t 19B with regard to color temperature as well as brightness of both channels, eg by a user, are manually fed to the control unit 11 and manually set or input by the user via or into a suitable interface 10.
  • the values can - as already mentioned - automatically detected by an external (measuring) sensor and passed on to the control unit 11 as well automatically.
  • the e control unit 11 thus receives setpoint values for the mixed color of the overall LED system 21 and its brightness as well as the actually applied actual values of currents and voltages of the respective LED paths 16A, 16B (channels).
  • the unavoidable power limitation of each involved LED link 16A, 16B of the overall system 21 - it is not always possible to provide the signals supplied by the interface 10, e.g. to be realized by the user or requested by the sensor system to realize color-brightness pairs.
  • the present invention makes it possible to come as close as possible to these set points, either on the part of the color temperature or on the part of their intensity or possibly by a compromise in the form of an acceptable intermediate value.
  • the e control unit 11 calculates from the actual values 17A, 17B, 18A, 18B and the desired setpoint values 19A, 19B possible setpoint values 20A, 20B which best correspond to the preferences of the user and / or the specifications of the sensor system.
  • a voltage actual value channel 1 A voltage actual value channel 1
  • A e.g. user-defined setpoints ChannelB eg, user-defined setpoints ChannelA best-possible setpoints Channel 1B best-possible setpoints Channel 2

Landscapes

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

Abstract

L'invention concerne un système à DEL multicanal comportant une unité de commande (8), (9A), (9B) qui est configurée pour alimenter indépendamment l'un de l'autre au moins deux canaux de sortie de DEL (16A), (16B) en une tension (U_K1), (U_K2) ou un courant (I_K1), (I_K2) réglé(e) sur une valeur théorique. L'unité de commande (8), (9A), (9B) est configurée par ailleurs pour limiter la puissance maximale de chaque canal de sortie de DEL (16A), (16B) d'une part et la puissance cumulée de tous les canaux de sortie de DEL (16A), (16B) d'autre part à des valeurs spécifiées. L'unité de commande (8), (9A), (9B) est réalisée pour réduire la valeur théorique d'un canal de sortie de DEL (16B) quand sa puissance (P_K2) est supérieure à la puissance cumulée (P_System) maximale admissible moins la puissance de l'autre/des autres canaux de sortie de DEL (P_K1).
EP18768863.5A 2017-09-25 2018-09-10 Dispositif et procédé servant à limiter de manière dynamique la surcharge pour des systèmes à del multicanaux à température de couleur variable Active EP3666042B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017216902.8A DE102017216902A1 (de) 2017-09-25 2017-09-25 Vorrichtung und Verfahren zur dynamischen Überlastbegrenzung bei farbtemperaturdimmbaren Mehrkanal-LED-Systemen
PCT/EP2018/074325 WO2019057535A1 (fr) 2017-09-25 2018-09-10 Dispositif et procédé servant à limiter de manière dynamique la surcharge pour des systèmes à del multicanaux à température de couleur variable

Publications (2)

Publication Number Publication Date
EP3666042A1 true EP3666042A1 (fr) 2020-06-17
EP3666042B1 EP3666042B1 (fr) 2022-07-20

Family

ID=63556336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18768863.5A Active EP3666042B1 (fr) 2017-09-25 2018-09-10 Dispositif et procédé servant à limiter de manière dynamique la surcharge pour des systèmes à del multicanaux à température de couleur variable

Country Status (4)

Country Link
EP (1) EP3666042B1 (fr)
AT (1) AT17901U1 (fr)
DE (1) DE102017216902A1 (fr)
WO (1) WO2019057535A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019118341B3 (de) * 2019-07-08 2020-07-09 Insta Gmbh Linearlichteinheit, Lichtquellenmodul für eine solche Linearlichteinheit sowie Verfahren zum Betreiben einer solchen Linearlichteinheit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8177389B1 (en) * 2007-09-13 2012-05-15 Cypress Semiconductor Corporation Deterministically calculating dimming values for four or more light sources
US20100244711A1 (en) * 2009-03-30 2010-09-30 Richard Landry Gray Self-Calibrating White Light Emitting Diode Module
TWI419615B (zh) * 2009-08-31 2013-12-11 Young Lighting Technology Corp 照明系統及其照明控制方法
US8436549B2 (en) 2010-08-13 2013-05-07 Bridgelux, Inc. Drive circuit for a color temperature tunable LED light source
CN103891412B (zh) * 2011-09-23 2015-10-14 马田专业公司 基于电流-电压模型来控制照明装置的方法
DE102013108552B4 (de) * 2013-08-08 2016-07-21 Insta Elektro Gmbh Steuerverfahren für eine Mischlichtquelle sowie Steuervorrichtung für eine Mischlichtquelle
CN104125692A (zh) * 2014-08-11 2014-10-29 矽力杰半导体技术(杭州)有限公司 多路led恒流控制器及控制方法
EP3016478B1 (fr) * 2014-10-29 2018-10-03 Helvar Oy Ab Commande combinée de la puissance de sortie dans un pilote de DEL multicanal
US9826581B2 (en) * 2014-12-05 2017-11-21 Cree, Inc. Voltage configurable solid state lighting apparatuses, systems, and related methods

Also Published As

Publication number Publication date
DE102017216902A1 (de) 2019-03-28
EP3666042B1 (fr) 2022-07-20
WO2019057535A1 (fr) 2019-03-28
AT17901U1 (de) 2023-07-15

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