EP2249624A2 - Elektrische Schaltungsanordnung - Google Patents

Elektrische Schaltungsanordnung Download PDF

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Publication number
EP2249624A2
EP2249624A2 EP10161765A EP10161765A EP2249624A2 EP 2249624 A2 EP2249624 A2 EP 2249624A2 EP 10161765 A EP10161765 A EP 10161765A EP 10161765 A EP10161765 A EP 10161765A EP 2249624 A2 EP2249624 A2 EP 2249624A2
Authority
EP
European Patent Office
Prior art keywords
led
control
micro controller
user control
arrangement
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.)
Withdrawn
Application number
EP10161765A
Other languages
English (en)
French (fr)
Other versions
EP2249624A3 (de
Inventor
Sune Ågren
Lars Ståhl
Joel Sundberg
Iman Habib Pourian
Gustav Josefsson
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.)
VADSBO TRANSFORMATORER AB
Original Assignee
Vadsbo Innovation AB
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 Vadsbo Innovation AB filed Critical Vadsbo Innovation AB
Publication of EP2249624A2 publication Critical patent/EP2249624A2/de
Publication of EP2249624A3 publication Critical patent/EP2249624A3/de
Withdrawn legal-status Critical Current

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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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/18—Controlling the light source by remote control via data-bus transmission
    • 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
    • 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

Definitions

  • the present solution relates to an electric circuit arrangement. More particularly the present solution relates to a LED control drive box for operation and control of light diodes.
  • LED Light Emitting Diodes
  • 230 V LED lamps with power from 1W can be designed as a cold light lamp which also comprises a drive device as power supply for the diode. This is the reason why these types of lamps do not need any external drive devices. However, a drawback is that the lamp can not be controlled/dimmed.
  • An electronic low voltage transformer which can be dimmed and which gives 12V high frequency 22-45 kHz AC can be used to drive LED lamps. These types of lamps are common today.
  • a general electric trailing edge dimmer can normally be used to dim a lamp, unless the product specification states that the lamp is not dimmable. In that case, separate drive devices and control devices are needed.
  • LED drive devices which gives a constant voltage of 12 VDC or constant currents of 350, 700 or 1050 mA etc. for operation of light diodes.
  • a LED drive device acts as a power supply for the light diodes. It converts 50Hz AC 230V (or other voltage, such as 120V used in the US) input to the low DC voltage required by the light diodes in question.
  • the LED drive device function is similar to the functions of a high frequency (HF) device. The similarity lies in that it delivers the correct starting voltage and then controls the current which flows to the lamp after the start.
  • LED drive devices are used in addition to separate control devices giving pulse width modulated (PWM) current (PWM control devices) which are placed between the drive device and the light diode.
  • PWM control devices pulse width modulated current
  • Separate 1 - 10 Vdc control devices or separate push button switches are used for control of PWM control devices.
  • the PWM circuit is as an exception integrated in the drive device.
  • today's drive devices for light diodes with built-in PWM circuit are large and require a large space.
  • Rotary knob dimmers are used in installation boxes and are an assembly form for control devices which has been accepted to a large extent on the market which also have been distributed to a large extent today.
  • Rotary knob dimmers are used for control of 230V halogen lamps, 12V halogen lamps, incandescent light, fluorescent lighting etc.
  • Approximately 700 000 rotary knob dimmers are deposited on the Swedish market each year, which emphasizes the importance of adapting the size of drive and control devices to today's standard installation boxes.
  • An operation and control device which will fit into the shape of a rotary knob dimmer will also solve a substantial mounting problem on the market which has no sufficient solution today.
  • a device for operation and control of constant current light emitting diode, LED, lamps comprising:
  • the same device may be applied for operation and control of constant voltage LED:s - the same arrangement being beneficial for mounting in very narrow places with the size of an apparatus junction box.
  • the micro controller may be arranged to detect signals on the user control input and to analyze the signals from the user control input in order to determine type of user control interface.
  • the type of user control interface may be one of switch, potentiometer, push button, or pulse type.
  • the micro controller may be arranged to detect a derivative of the signal on the user control input for determining the type of user control.
  • a second aspect of the present invention is provided, an arrangement for operation and control of light emitting diodes, LED, the arrangement comprising
  • the arrangement may be comprised in a housing.
  • each of the plurality of circuit boards may be comprised in a housing.
  • the devices occupies a minimum amount of space and may fit into a standard apparatus junction box.
  • the dimmer/driver solution comprises control devices and drive devices which save space compared to having separate devices.
  • the dimmer/driver solution is small which requires little space.
  • the solution provides an advantage of fitting into apparatus junction boxes on today's market which are of "standard" size.
  • the size and design provides easy and simple mounting of the dimmer/driver solution for electricians on the field. Since the solution accepts several different types of user control interfaces, it also provides a flexible installation setup for the electrician on the field. Furthermore, the solution according to the present invention may provide a prolonged lifetime of LED lamps.
  • the present solution relates to a device for operation and control of constant current light emitting diode (LED) lamps.
  • the solution comprises modular circular arrangements of drive circuits and control circuits in apparatus box formats with multiple control input terminals for operation and control of light diodes and connection arrangement between the modules, in addition to a synchronization function for synchronizing pulse width modulation signals in each module in the modular arrangement.
  • Figure 1 illustrates schematically a dimmer drive box 200 (a LED driver/control unit) for operation and control of constant current LED lamps.
  • At least one circuit board (not shown) is comprised in a casing of the box 200.
  • a circuit arrangement comprising drive and control circuits are provided on the circuit board(s).
  • the drive and control circuits are designed to fit within a substantially circle shaped form with a diameter of approximately 50mm and with an output power of minimum 9 W; however other minimum powers may be applicable, being smaller or larger, e.g. 6 W or 18 W. Changing the output power may change the geometrical size.
  • Ignition wires are connected to the circuit board(s). Some of the ignition wires are connected to a user control input 212 on the box 200.
  • the box 200 also comprises a sensor (not shown) which detects the type of switch connected to the control input 212, such as for example a push button switch, a rotary knob dimmer, a touch dimmer, a potentiometer, a remote control dimmer etc.
  • the control signals to a dimmer may for example have the values 1 - 10 VDC using a 1 - 10 V rotary button knob.
  • the circuit board also comprises a power supply connection 205.
  • the power supply connection 205 may for example be a regular 230VAC power supply - however other supply voltages may be applicable, such as from 100 VAC and up including line voltages in US and Europe.
  • a micro controller (not shown) is arranged to detect signals from the user control input and to analyze the detected signals, e.g. using a derivative procedure, in order to automatically determine the type of user control interface, i.e. if the type of user control interface is for example a switch, a potentiometer, or push button type. Furthermore the micro controller is arranged to control the LED lamp output light in response to the user control, e.g. using a pulse width modulation (PWM) solution.
  • PWM pulse width modulation
  • the dimmer drive box 200 may also comprise a current control device 220 for setting (maximum) output current, e.g. a jumper or a dip-switch.
  • This current control device 220 may adjust the output current to for example 350mA, 500mA, 700mA or 1050mA.
  • This current control device 220 may provide an input to the micro controller which controls the device
  • the solution provides two different control configurations, constant current and/or PWM for the same type of load.
  • the dimmer drive box 200 may also comprise a synchronization communication interface for synchronizing pulse width modulation signals in each box 400 when a plurality of boxes 400 is stacked.
  • the circuit arrangement is provided on a circuit board having a flat and in one embodiment substantially circular design; however, other shapes of the circuit board may be applicable.
  • the circuit arrangement is adapted to operate and control LED lamps of the constant current type.
  • This flat and substantially circular design provides a size and form that is adaptable in standard apparatus junction boxes, for instance for mounting inside walls.
  • An example of the circuit board is shown schematic in the block diagram in Figure 2 .
  • the dotted lines in figure 2 show barriers between the different parts of the circuit - the two parts are galvanically separated from each other.
  • the solid line represents the box 200 in figure 2 .
  • the circuit board comprises an EMI unit 305 providing safety functions regarding electromagnetic interferences to the circuit.
  • the EMI 305 is connected to a transformer 310.
  • a regulator 315 e.g.
  • a flyback regulator is optionally connected between the EMI 305 and the transformer 310 or the regulator may be directly connected to the transformer.
  • An opto coupler 320 is connected between the regulator 315 and a secondary regulator 325 to differentiate between the primary and secondary side, separating them galvanically.
  • the secondary regulator 325 is the unit that makes it possible to stack a plurality of circuit boards and to synchronize them. Output from the transformer 310 is also connected to the secondary regulator 325.
  • the secondary regulator 325 has a synchronizing wire 335 and wires connected to a dimmer device 330; it should be noted that the dimmer device 330 may be part of the circuit board.
  • a measuring unit 340 (MEAS) is connected between the transformer 310 and the load 345, e.g. an LED lamp, and the measuring unit 340 is arranged to measuring the present output signal, e.g. the current, to the load.
  • the secondary regulator 325 may be controlled by a micro controller unit or a micro processor unit, such as an 8 bit controller, or a hardware based controller such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array)
  • the solution with regulator and transformer 310 gives the desired voltage in one step as compared to solutions where two steps are required to provide the desired voltage.
  • the transformer is designed for the specific supply voltage at the installation, e.g. 230 or 110 volts 50/60 Hz depending on location.
  • the secondary regulator comprises a micro controller or similar processing unit 601 (MCO) and a comparator 602 as shown in Fig. 5 .
  • the micro controller provides a reference signal through a reference signal output interface 606 to the comparator which also receives a signal related to the measurement of the current output to the LED's.
  • the micro controller also comprise a measurement signal input interface 604, a processor 605, and a common interface unit 607.
  • the common interface unit provides a plurality of communication/connection interfaces 603 with different external units, such as the dimmer 330 user control, maximum current setting, synchronization with other dimmer drive boxes, and so on. Depending on configurations set during installation, for instance reference to maximum current output, and dimmer level set by a user during operation, the reference signal will be set accordingly.
  • the comparator provides a quick feedback solution for enabling a stable constant current setting output to the LED lamp.
  • the comparator in turn provides a control signal through a connector 608 to the primary side via the opto coupler for controlling the output current.
  • the micro controller may be arranged to provide a feedback signal directly by receiving the measured current signal and determining changes needed to keep the current stable; however, in such a solution the micro controller need to be fast enough to handle sudden changes, whereas the comparator solution is inherently fast enough to handle sudden changes.
  • the solution according to the present invention provides a small footprint circuitry enabling installation in a small volume, e.g. as provided in an installation box in a wall of a building. Furthermore, the present invention provides a cost effective solution for handling a plurality of different user control solutions and easy configuration between different output current levels.
  • a plurality of circuit boards 405 may be connected together in a modular way to form a modular arrangement 415 either by connecting a plurality of boxes 400 each comprising a circuit board 405 as illustrated in Figure 3a , or by directly connecting a plurality of circuit boards 405 via connection arrangements 410 as schematically illustrated in Figure 3b .
  • each module may for example have a power of minimum 9W; however, other effects may be applicable.
  • a modular arrangement 415 comprising three modules will then have an effect of 3 X 9W, which all may be fitted together in an apparatus junction box. This effect makes it possible to use the present solution in small spaces such as down lights and LED armature for walls, ceilings, tables, floors, and in wall boxes.
  • connectors 410 are provided between the circuit boards 405 and between boxes 400 for connecting the modules together.
  • the connection arrangements between the base units 410 give the modular arrangement 415 scalable powers up to 27 W in a standard installation box, which is a multiple of 9W.
  • the modular arrangement 415 or the circuit board 405 is equipped with multiple control inputs.
  • the number of control inputs can be adjusted dependent on the system requirements.
  • the control inputs make it possible to control the modules in the module arrangement 415 by means of for example a 1 - 10V potentiometer, via a pulse control unit, or with a push button control.
  • the processor controlling the secondary regulator handles the user control input and determines which type of control means that is applicable; this means that one may install two different types of user interfaces at the same location and the processor may determine which is in operation at any time, e.g. both a 1-10 V dimmer and a push button solution may be connected at the same time.
  • This universal user control determination provides a flexible solution for installment of the device.
  • the modular arrangement 415 is also equipped with multiple output drive currents.
  • the number of output drive currents can also be adjusted dependent on the system requirements.
  • the box 400 as illustrated in figure 3a may for example have a height of 15mm and the distance between two boxes 400 may for example be 5mm.
  • a modular arrangement 415 comprising three boxes 400 may for example have a total height of 55mm.
  • the modular arrangement 415 shown in figure 3a and 3b may fit into a standard apparatus junction box when there is a need for high power in devices such as for example rotary knob dimmers (which are a standard embodiment for installation devices for control of light).
  • the diameter of the circular apparatus dimmer drive box 400 with casing may for example have a diameter of 57mm in order to fit into standard apparatus junction boxes, however other standard junction boxes exists with diameters of 70, 64, 60, 54 and 51 mm.
  • circuit board 405 fitted inside the box 400 may have a diameter of approximately 46 mm. These dimensions make it easy to fit the box 400 into standard apparatus junction boxes commonly used on the market today. It should be appreciated that non-circular apparatus junction boxes may be applicable as well, e.g. rectangular boxes for mounting in ceiling configurations.
  • the synchronization may be provided by a synchronization communication interface.
  • One alternative may be to use a synchronize wire where the micro controller on each module is programmed to listen to the wire to decide if it should be a master micro controller or not. The micro controller listens on the wire and if it has not heard any signal for a random time delay it will transmit on the wire and thus informing other controllers connected on the synchronization interface that it takes command as master. If the micro controller detects that another micro controller is the master micro controller it becomes a slave micro controller.
  • each controller is master to begin with until they read data on the synchronization interface.
  • the master will not read any data on this synchronization interface and will be the only one transmitting since it is the only one receiving signals on the user control interface.
  • the dimmer box 400 may be connected to a number of different dimmer types, such as for example toggle switch or rotary knob dimmer.
  • Fig. 4 illustrates a number of different applications using the present invention.
  • Fig. 4A is shown the example discussed earlier in this document with one control unit 501, e.g. a wheel dimmer or push button, connected to a LED driver/control unit 502 in turn controlling a LED lamp 503.
  • one control unit 501 e.g. a wheel dimmer or push button
  • a LED driver/control unit 502 in turn controlling a LED lamp 503.
  • Fig. 4B is shown a variation where one control unit 501 controls a plurality of LED driver/control units 502 each controlling a LED lamp 503.
  • the number of LED driver/control units 502 or LED lamps 503 is not limited to the two shown but may be any number of units: 2, 3, 4, 5, 10, 20, or even higher depending on installation configuration.
  • Fig. 4C shows still another variation, where a plurality of control units 501 is connected to one LED driver/control unit 502. It should be appreciated that the number of control units 501 is not limited to the two shown but may be any number such as 3, 4, 5 or further up to 10 or more.
  • Fig. 4D shows yet another variation of usage of the present invention, where one control unit 501 is connected to a stacked LED driver/control unit 504 comprising a plurality of LED driver/control units 505, and the stacked LED driver/control unit 504 is in turn connected to a plurality of LED lamps 503.
  • the number of LED driver/control units 505 in the stacked unit is not limited to the two shown, but may be any suitable number such as for instance 3 or more. In many applications three are used for increasing the total effect deliverable to the LED lamp 503 as discussed earlier in this document.
  • Fig. 4E shows a simplified example of the solution of Fig. 4D , where one control unit 501 is connected to one stacked LED driver/control unit 504, comprising a plurality of LED driver/control units 505, and where the stacked unit controls one LED lamp 503.
  • the LED driver/control unit 505 is arranged to operate together with several such units so as to output a synchronized control current to the LED lamp. This may be achieved by several different alternatives:
  • the "stacked" LED driver/control unit may comprise one single “larger” LED driver/control unit capable of outputting a larger control current, e.g. 20 W, to the LED lamp(s) 503.
  • the "stacked" LED driver/control unit is then not to be considered stacked.
  • a dimmer driver system for controlling and driving a LED lamp with 9 W, max 700 mA and max 30 V from a supply voltage of 230 VAC.
  • the first step in the solution is a half wave rectification of the incoming supply voltage of 230 VAC. This voltage is thereafter buffered using capacitances in order to provide a constant DC voltage.
  • Next step is the flyback converter with a switch circuit that operates at frequencies of the order 130 kHz; however, it should be noted that this is not fixed.
  • the current is measured through the load via a resistor.
  • the signal from the resistor is connected to an operational amplifier which amplifies the signal from 0-70 mV to 0-2.5V.
  • the amplified signal is connected to a comparator which compares the measured and amplified signal with a reference voltage signal. If the current is too large compared to the reference signal the comparator will send a signal via the opto-coupler to the switch circuit which then will shut down the feed to the primary side of the transformer.
  • An alternative method may be to use the processor and measure the current and let it control the signal to the opto-coupler.
  • the processor sets the voltage signal digitally. This is transferred from digital to analog using for instance an R2R digital to analog converter (DAC).
  • the measured signal indicative of the current is converted to digital using an analog to digital converter (ADC) and inputted in the processor. If the current is too large the processor decreases the reference voltage to the comparator via the DAC or respectively increases the reference voltage if the current is too small.
  • a switch is located on the circuit board with settable positions for desired current drive level, e.g. 350 mA, 500 mA,, 700 mA or 1050 mA.
  • This switch may be for instance a DIP switch.
  • the DIP-switch is set to 700mA and this is detected by the processor and the reference voltage may be controlled accordingly.
  • the voltage over the load is driven to a maximum, e.g. 27 V depending on a zener diode provided in relation to the opto-coupler. This could in turn result in the destruction of the LED's or non desired operation of the LED's, for instance flickering action when the lamp is turned on.
  • the voltage over the load is measured and regulated by the processor to a constant value during a shut down period. Alternatively, a minimum voltage level may be ramped up slowly when the lamp is turned on to create a soft build up.
  • the regulator creates a 10 VDC source with the use of a boost circuit.
  • the boost circuit has the purpose of amplifying a 2.5 VDC supply voltage to 10 VDC. This is done by driving the current through a coil and then disconnects the supply and lead the energy in the coil through a diode to a capacitor which is charged to desired value. This value is limited by a zener diode in parallel with a capacitor. The output voltage is then steered down by a standard external 1-10 V dimmer.
  • the 1-10V dimmer draws current until the correct voltage is provided over the dimmer and is regulated by the user through a rotational wheel.
  • the voltage level (1-10V) is divided down using a voltage splitting to 0.25 - 2.5 V and converted to a digital signal for the processor and handled by the regulating feedback loop in the processor.
  • the same control solution as for the 1-10V dimmer control may handle a push button control by interpreting a 0V signal as that a push button is connected and pushed. A quick push on the push button shuts down/turns on the diodes and if the user holds in the push button the system will dimmer the current up or down alternatively.
  • An alternative user control is the potentiometer solution which uses the same connectors as for the other user control solutions; however, the processor need to be informed about this solution and this may be done using a switch. The processor may then determine suitable set value using a voltage divider algorithm.
  • a low loss voltage regulator adapted to the processor/microcontroller is used.
  • a transistor is used in series with the load and this transistor is controlled by the processor/microcontroller.
  • the MEAS unit may be arranged to provide a signal responsive to the voltage instead of the current.
  • the MEAS unit may be arranged to provide signals responsive of both the current and voltage.
  • the solution according to the present invention may prolong the life time expectancy of LEDs.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
EP10161765.2A 2009-05-04 2010-05-03 Elektrische Schaltungsanordnung Withdrawn EP2249624A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0950298A SE0950298A1 (sv) 2009-05-04 2009-05-04 Arrangemang av elektrisk krets

Publications (2)

Publication Number Publication Date
EP2249624A2 true EP2249624A2 (de) 2010-11-10
EP2249624A3 EP2249624A3 (de) 2015-03-04

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EP10161765.2A Withdrawn EP2249624A3 (de) 2009-05-04 2010-05-03 Elektrische Schaltungsanordnung

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EP (1) EP2249624A3 (de)
SE (1) SE0950298A1 (de)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN102548083A (zh) * 2010-12-07 2012-07-04 西安博昱新能源有限公司 多组led灯的电路控制系统
WO2014071415A1 (en) * 2012-11-05 2014-05-08 Osram Sylvania Inc. Driver for solid state light sources
CN105491704A (zh) * 2015-02-09 2016-04-13 鲁周波 Led灯调光控制系统及方法
WO2016093767A1 (en) * 2014-12-12 2016-06-16 Switchtech Ab Driving circuitry for a lighting arrangement
CN107062160A (zh) * 2012-08-28 2017-08-18 奥斯兰姆施尔凡尼亚公司 模块化多通道连接器系统及方法
EP3261411A1 (de) * 2016-06-21 2017-12-27 Schreder S.A. Treibersystem für lichtemittierende vorrichtung

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102548083A (zh) * 2010-12-07 2012-07-04 西安博昱新能源有限公司 多组led灯的电路控制系统
CN107062160A (zh) * 2012-08-28 2017-08-18 奥斯兰姆施尔凡尼亚公司 模块化多通道连接器系统及方法
WO2014071415A1 (en) * 2012-11-05 2014-05-08 Osram Sylvania Inc. Driver for solid state light sources
WO2016093767A1 (en) * 2014-12-12 2016-06-16 Switchtech Ab Driving circuitry for a lighting arrangement
CN105491704A (zh) * 2015-02-09 2016-04-13 鲁周波 Led灯调光控制系统及方法
WO2016127679A1 (zh) * 2015-02-09 2016-08-18 鲁周波 Led灯调光控制系统及方法
EP3261411A1 (de) * 2016-06-21 2017-12-27 Schreder S.A. Treibersystem für lichtemittierende vorrichtung
EP3261411B1 (de) 2016-06-21 2022-04-20 Schréder S.A. Treibersystem für lichtemittierende vorrichtung

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Publication number Publication date
SE0950298A1 (sv) 2010-11-05
EP2249624A3 (de) 2015-03-04

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