EP3603345A1 - Schaltungsanordnung und verfahren zum betreiben von leuchtmitteln - Google Patents
Schaltungsanordnung und verfahren zum betreiben von leuchtmittelnInfo
- Publication number
- EP3603345A1 EP3603345A1 EP18719548.2A EP18719548A EP3603345A1 EP 3603345 A1 EP3603345 A1 EP 3603345A1 EP 18719548 A EP18719548 A EP 18719548A EP 3603345 A1 EP3603345 A1 EP 3603345A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- switch
- circuit arrangement
- supply voltage
- control unit
- 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
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000004804 winding Methods 0.000 claims abstract description 68
- 230000000630 rising effect Effects 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 description 20
- 238000011161 development Methods 0.000 description 9
- 230000018109 developmental process Effects 0.000 description 9
- 238000009499 grossing Methods 0.000 description 9
- 230000004913 activation Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
-
- 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]
Definitions
- the present invention relates to a circuit arrangement which is provided for operating light-emitting means, wherein the light-emitting means are, in particular, LEDs. Furthermore, the invention relates to a method for operating bulbs, wherein a voltage supplied and clocked by at least one switch circuit is used, via which a transformer for transmitting electrical energy from a primary winding to a secondary winding is fed and in which the lighting means on the Secondary winding of the transformer can be supplied with electricity.
- LEDs semiconductor light sources
- LEDs usually can not be supplied directly with the voltage provided by the power supply network compared to conventional light sources such as light bulbs or the like. Instead, efficient LED operation is only possible when a predetermined voltage drops across the LED and a current flows through the LED that is within a predetermined range.
- AC LED modules are known from the prior art, in which the LED module can be connected directly to the general power supply network, even these solutions require a relatively high effort. Usually, therefore, it is provided to operate LEDs with the aid of a so-called. Converter converts the supply voltage provided on the input side into a suitable for the operation of the LEDs DC voltage. Also for this purpose, different approaches are known, with Figure 1 shows a currently preferred circuit variant.
- a current flow through the primary winding LI of the transformer 102 is permitted or interrupted, wherein by selecting a suitable frequency or a suitable duty cycle for the PWM signal for driving the switch 105, a suitable current flow is generated on the secondary side, which is suitable for the operation of the LED track 110.
- the flyback converter shown in FIG. 1 has proven itself many times for operating LEDs and is widely used in a wide variety of variants.
- a certain disadvantage of this known solution is that the smoothing capacitor 102 required in parallel to the primary winding LI and switch 105 must be made relatively large and thus increases the cost of the circuit arrangement 100. Furthermore, this capacitor 102 is the most vulnerable component of the circuit arrangement 100 and has a relatively short life.
- the present invention is therefore based on the object to provide a novel solution for operating bulbs, in which the disadvantages described above are avoided.
- the solution according to the invention is based first of all on the knowledge that it is also possible to dispense with the above-mentioned smoothing capacitor considered problematic, provided that the alternating driving of the switch is carried out in a suitable manner.
- a transformer with a Primary winding and a secondary winding are used, in series with the primary winding, a controllable switching element is connected, with the help of which a current flow is caused or interrupted by the primary winding, now according to the invention as a supply voltage for the transformer rectified, but not smoothed AC voltage is used and depending on the current level of the supply voltage, the switching frequency, the duty cycle and / or the slope of the rising or falling edge of the signal to drive the switch is adjusted.
- a circuit arrangement for operating light-emitting means, in particular for operating one or more LEDs, the circuit arrangement having a voltage-supplyable and clocked by at least one switch circuit via which a transformer for transmitting electrical energy fed from a primary winding to a secondary winding is, wherein the lighting means are supplied via the secondary winding of the transformer with power, and a control unit for alternately driving the switch, wherein the supply voltage for the transformer is a rectified, not smoothed AC voltage and wherein the control unit is adapted depending from the supply voltage for the transformer to adapt at least one of the following parameters for the control of the switch: the switching frequency; the duty cycle; the steepness of the rising and / or the falling edge.
- the invention proposes a method for operating light sources, in particular for operating one or more LEDs, in which a voltage-supplied and clocked by at least one switch circuit feeds a transformer for transmitting electrical energy from a primary winding to a secondary winding, wherein the lighting means the secondary winding of the transformer can be supplied with power, wherein it is at the supply voltage for the transformer is a rectified, non-smoothed AC voltage, and wherein, depending on the supply voltage for the transformer, at least one of the following parameters for the control of the switch is adapted: the switching frequency; the duty cycle; the steepness of the rising and / or the falling edge.
- the solution according to the invention thus represents a further development of the classic principle of the flyback converter, which now allows, however, to dispense with the prone and costly smoothing capacitor. Despite all this, with suitable control of the switch, the arrangement of light sources can be supplied and operated in an efficient manner.
- the secondary-side current in addition to the required monitoring of the supply voltage, it is also possible to monitor the secondary-side current in order to optimize the triggering behavior for the switch.
- appropriate means for detecting the secondary side current can be provided, for which purpose preferably an optocoupler is used, with the aid of which the secondary side current reproducing signal is transmitted to the primary side of the transformer, on which the driver for the switch is positioned.
- a constant current source is provided, which is arranged in series with the lamps to be operated.
- the primary task of this constant current source is first to avoid too high a current flow through the lamps.
- the constant current source is designed to be controllable and this is additionally controlled in accordance with the control unit in order to additionally optimize the supply for the lamps.
- the power transmission between the primary winding and the secondary winding of the transformer can also be made flexible according to a further preferred embodiment by the winding ratio between the primary winding and the secondary winding is variable.
- the primary winding and / or the secondary winding is subdivided into partial windings, wherein the partial windings are then selectively activated by the control unit or can be deactivated, so they are active or not part of the transformer.
- the control of the switch takes place via an RC element, in which case particularly preferably the RC element has an adjustable resistor.
- the control of the switch takes place via an RC element, in which case particularly preferably the RC element has an adjustable resistor.
- the adjustable resistor is formed by internal components of a microcontroller.
- microcontrollers generally have a voltage divider internally for outputting an analog signal, the individual resistors of which can optionally be combined accordingly.
- the RC element has a plurality of capacitances which can be selectively activated or deactivated by the control unit. In this case, it is thus possible to influence the form of the triggering signal for the clocked switch once again more flexibly via the RC element.
- a further preferred measure to optimize the driving behavior for the switch is also to bridge the capacitor of the RC element by another controllable switch. This can possibly be turned on to disable the effect of the RC element and, for example, to end the switching cycle for the controllable switch of the transformer immediately. It may possibly also the Control of this second switch with the help of an additional RC element done. This then makes it possible to selectively influence the falling edge of the drive signal for the switch.
- Figure 2 is a basic representation of the inventive concept for
- Figure 3 shows a first embodiment of an inventive
- FIGS. 4 to 6 show various developments of that shown in FIG.
- Figure 7 shows a first measure to optimize the control of the controllable
- Figures 8 - 10 further variants for optimizing the control of the controllable
- FIG. 2 initially shows the basic concept of the circuit arrangement according to the invention and the procedure according to the invention for operating an LED section.
- the circuit generally provided with the reference numeral 1 is supplied on the input side an AC supply voltage U A C, said voltage then first by a rectifier 5 - eg. A bridge rectifier - in a rectified supply AC voltage UDC is implemented.
- the circuit arrangement 1 comprises a transformer 10 having a primary winding LI and a secondary winding L2, wherein the secondary winding L2 then supplies the LED track 110 with power.
- the secondary circuit of the circuit 1 is shown very simplified and the secondary winding L2 is directly connected to the LEDs 110.
- the secondary circuit could, however, also be made more complex and, in particular, the LED arrangement 110 could not consist merely of a single serial LED string, but instead could have a more complex connection of LEDs.
- a controllable switching element 11 in the form of a transistor is provided in series with the primary winding LI of the transformer 10, via which a current flow via the primary winding LI is optionally permitted or interrupted can be.
- the activation of the switch 1 is carried out via a driver or control unit 20.
- the smoothing capacitor shown in FIG. 1 and basically required in the state of the art is dispensed with. That is, the rectified rectifier 5 rectified input AC voltage now forms a supply voltage U D C for the transformer 10, which is not constant or at least approximately constant, but instead of positive half-waves, in the Are formed substantially sinusoidal, exists. Despite all this, a suitable LED operation can also be realized with this special supply voltage U for the transformer 10. That is, in spite of all, it is possible, on the secondary side, to supply the LED arrangement 110 with a voltage suitable for the operation of the LEDs and a suitable current.
- the driver circuit 20 performs a more flexible control of the switch 11 in comparison to the prior art.
- the driver circuit 20 performs a more flexible control of the switch 11 in comparison to the prior art.
- a purely rectangular PWM signal as provided in the control of the switch of the flyback converter in Figure 1, so now gives a much more complex drive signal u for the switch 11 of the inventive arrangement 1. This, however, the advantage achieved that can be completely dispensed with the smoothing capacitor.
- the change of the drive signal for the switch 11 must therefore be flexible depending on the current actual value of the supply voltage U D C. So it is a high-frequency drive signal u required, the course is constantly adjusted. In this case, for example, it is possible to subdivide the range of the supply voltage U D C into different subregions and to select a respectively suitable signal profile for the activation of the switch 11 for each subarea. However, a continuously dependent on the current value of the supply voltage control of the switch would be conceivable.
- FIG. 3 shows a basic version of the circuit arrangement 1 according to the invention, comparable elements to FIG. 2 being provided with the reference numeral. It can be seen, however, in FIG. 3, for example, that-as mentioned above-the LED arrangement 110 can be designed in many different ways.
- a corresponding sensor unit 25 is provided, which is connected to the output of the rectifier 5 and transmits a corresponding signal to the control unit 20.
- the evaluation of the supply voltage available for the transformer 10 with respect to the measurement accuracy can be optionally improved by the fact that - as indicated in Figure 3 - in addition with the help of another unit 30, a zero crossing detection is made.
- This unit is therefore directly connected to the external supply voltage U A C or connected to the input of the rectifier 5 and provides corresponding information regarding the zero crossing either to the unit 25, via which the supply voltage for the transformer 10 is evaluated and / or the control unit 20 itself.
- FIG. 3 A further development of the basic concept shown in FIG. 3 is shown in FIG. Again, like components have the same reference numerals, and now the zero crossing detection unit 30 is not considered optional.
- the secondary winding L2 of the transformer 10 is divided into two part windings L21 and L22, which via Controls 13 and 14 can be optionally added to the secondary circuit of the circuit 1.
- the control elements 13, 14 in this case consist of transistors, which are controlled via a potential separation, which is realized in each case with the aid of an optocoupler.
- the control unit 20 can optionally add the partial windings of the two windings LI or L2 of the transformer 10 to the corresponding primary circuit or secondary circuit or decouple them, so that the winding ratio of the transformer 10 can be adjusted in different steps .
- the concept of flexibly adjusting the winding ratio of the transformer 10 can also be transferred to the circuit variants of FIGS. 3 and 4; the use of the constant current source 36 shown in FIG. 5 is not absolutely necessary.
- the capacitor Cl of the RC element but not the associated resistor.
- This is achieved in a particularly advantageous manner by internal resistance components of the control unit 20.
- the control unit 20 is based on a microprocessor and microprocessors often have a DAC output via which an analog output signal is output depending on a digital setpoint.
- the generation of the analog output signal is carried out with the help of a built-in microprocessor voltage divider having a plurality of individual resistors.
- the voltage divider is schematically indicated by a serial arrangement of a plurality of individual resistors 23, which are selectively combined by a - not shown - multiplexer with each other to form a voltage divider, which ultimately for the fall of a desired analog voltage at the DAC output the control unit 20 provides.
- the supply voltage Vdd for the control unit 20 is provided here by the unit 25 connected to the output of the rectifier for detecting the actual value of the input voltage for the transformer 10.
- the unit 25 also transmits, as already mentioned, a signal representing the magnitude of the supply voltage.
- FIG. 1 A development of this idea just explained is shown in FIG. This is that parallel to the capacitor Cl of the RC element, a further controllable switch QO is provided, via which the capacitor Cl of the RC element can optionally be bridged or discharged. This makes it possible, by activating this switch QO abruptly cancel the time-delaying effect of the RC element with respect to the control of the switch 11, so that therefore the waveform can be additionally influenced here.
- modifying the operation of the RC element could also be done by changing the value of the capacitance of the RC element.
- a corresponding solution for this purpose is shown in Figure 9, wherein now three - preferably differently sized - capacitors Cl, C2 and Cn are provided (the number can, however, be chosen arbitrarily), in each case in series with the corresponding capacity, a controllable switch Ql, Q2 and Qn is provided, via which the associated capacitors Cl, C2 and Cn can be optionally added to the drive circuit for driving the switch 11.
- the control unit 20 can thus add any combination of these capacitances to the drive circuit for the switch 11, so that thereby - possibly in combination with an adjustment of the voltage at the DAC output - again finely tuned the waveform can be influenced.
- FIG. 10 shows a development, which in particular serves to influence the falling edge of the drive signal for the switch 11.
- the switch Q0 already provided in the variants of FIGS. 8 and 9 is not controlled directly via the control unit 20, but in turn an RC element is interposed.
- This RC element as for the realization and effect of the RC element for driving the switch 11. That is, by the combination of resistor R0 and capacitance CO, the signal curve in the control of the discharge switch Q0 adapted and thus the slope of the falling edge of the control signal can be adjusted.
- the resistance RO can be made variable by using internal voltage divider components of the control unit 20 to realize this resistance.
- the capacity value may possibly be made variable by as well as in the embodiment of Figure 9 a plurality of parallel capacitors are present, which are added by means of controllable switch either the corresponding drive path.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017207473.6A DE102017207473A1 (de) | 2017-05-04 | 2017-05-04 | Schaltungsanordnung und Verfahren zum Betreiben von Leuchtmitteln |
PCT/EP2018/060280 WO2018202453A1 (de) | 2017-05-04 | 2018-04-23 | Schaltungsanordnung und verfahren zum betreiben von leuchtmitteln |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3603345A1 true EP3603345A1 (de) | 2020-02-05 |
EP3603345B1 EP3603345B1 (de) | 2021-06-02 |
Family
ID=62044730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18719548.2A Active EP3603345B1 (de) | 2017-05-04 | 2018-04-23 | Schaltungsanordnung und verfahren zum betreiben von leuchtmitteln |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3603345B1 (de) |
AT (1) | AT17750U1 (de) |
DE (1) | DE102017207473A1 (de) |
WO (1) | WO2018202453A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020257962A1 (en) * | 2019-06-24 | 2020-12-30 | Texas Instruments Incorporated | Switching converter with multiple drive stages and related modes |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6078148A (en) * | 1998-10-09 | 2000-06-20 | Relume Corporation | Transformer tap switching power supply for LED traffic signal |
WO2007094810A2 (en) * | 2006-02-10 | 2007-08-23 | Color Kinetics Incorporated | Methods and apparatus for high power factor controlled power delivery using a single switching stage per load |
US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
DE102007040783A1 (de) * | 2007-08-28 | 2009-03-12 | Conti Temic Microelectronic Gmbh | Verfahren zur Ansteuerung von nichtlinearen Lastelementen |
DE102008044372A1 (de) * | 2008-12-05 | 2010-06-10 | Robert Bosch Gmbh | Schaltungsanordnung für eine Leuchtvorrichtung, Leuchtvorrichtung und Verfahren |
JP5629191B2 (ja) * | 2010-05-28 | 2014-11-19 | ルネサスエレクトロニクス株式会社 | 電源装置 |
US20130235623A1 (en) * | 2012-03-12 | 2013-09-12 | System General Corp. | Two-switch flyback power converters |
DE102014200437A1 (de) * | 2014-01-13 | 2015-07-16 | Tridonic Gmbh & Co Kg | Treiberschaltung für Leuchtmittel, insbesondere LEDs |
KR20160015964A (ko) * | 2014-08-01 | 2016-02-15 | 삼성전자주식회사 | 전자장치, 전원공급장치 및 그 전원제어방법 |
CA2891796A1 (en) * | 2014-08-19 | 2015-07-10 | Abbeydorney Holdings Ltd. | Driving circuit, lighting device and method of reducing power dissipation |
KR20160031776A (ko) * | 2014-09-15 | 2016-03-23 | 주식회사 솔루엠 | 전원장치 및 그의 구동방법 |
DE102014221024A1 (de) * | 2014-10-16 | 2016-04-21 | Tridonic Gmbh & Co Kg | Betriebsschaltung für Leuchtmittel mit PFC-Steuereinheit |
-
2017
- 2017-05-04 DE DE102017207473.6A patent/DE102017207473A1/de not_active Withdrawn
- 2017-06-27 AT ATGM138/2017U patent/AT17750U1/de not_active IP Right Cessation
-
2018
- 2018-04-23 WO PCT/EP2018/060280 patent/WO2018202453A1/de unknown
- 2018-04-23 EP EP18719548.2A patent/EP3603345B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
AT17750U1 (de) | 2023-01-15 |
DE102017207473A1 (de) | 2018-11-08 |
EP3603345B1 (de) | 2021-06-02 |
WO2018202453A1 (de) | 2018-11-08 |
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