EP2901816A2 - Betriebsschaltung mit getaktetem konverter zur ansteuerung einer led-strecke - Google Patents
Betriebsschaltung mit getaktetem konverter zur ansteuerung einer led-streckeInfo
- Publication number
- EP2901816A2 EP2901816A2 EP13841314.1A EP13841314A EP2901816A2 EP 2901816 A2 EP2901816 A2 EP 2901816A2 EP 13841314 A EP13841314 A EP 13841314A EP 2901816 A2 EP2901816 A2 EP 2901816A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- led
- current
- control unit
- operating circuit
- 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
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 8
- 230000005347 demagnetization Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000012937 correction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000011144 upstream manufacturing 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]
-
- 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
Definitions
- the invention relates to an operating circuit for driving an LED track with at least one LED.
- the LED path is controlled by a clocked converter, preferably by a buck converter.
- the invention relates in particular to the indirect determination of the current (I LED ) through the LED path.
- LEDs have become an attractive alternative to conventional light sources such as incandescent or gas discharge lamps.
- LEDs Light Emitting Diode
- LEDs Light Emitting Diode
- LEDs are therefore always operated in a mode in which the current flow through the LED is controlled.
- switching regulators for example step-down converters or buck converters.
- a switching regulator is known for example from DE 10 2006 034 371 AI.
- a control unit controls a high-frequency clocked switch (for example, a power transistor, FET, MOSFET).
- a high-frequency clocked switch for example, a power transistor, FET, MOSFET.
- the LED current in the freewheeling can not readily be measured, ie, with the switch turned off, nonconducting however, necessary if the LED current is to be supplied as an actual value for controlling the LED distance.
- the invention provides an operating circuit for an LED track with at least one LED, wherein the operating circuit at at least one input side terminal, a supply voltage can be supplied, and the operating circuit comprises a coil and a clocked by a control unit first switch, wherein at is electrically latched in the coil, an energy is discharged, which discharges in Vietnameseleitschreib- switched first switch via a diode and the LED path, wherein a capacitor is provided, which is arranged parallel to the LED track and at connected LED during the phase of the discharge of the coil the current through the LED is maintained, and wherein the control unit is adapted to determine the switch current through the first switch to a first sense resistor, preferably the supply voltage to a second sense resistor and preferably a measurement voltage at the Determine the LED distance at a third measuring resistor and calculate the LED current through the LED
- the controller may calculate the LED current from the product of the supply voltage and the switch current as transmitted power divided by the LED voltage.
- the control unit may average the switch current (low pass filtering, time averaging, integration).
- the LED current can be supplied to the control unit as a feedback signal, in particular as an actual value.
- the control unit may control the on time of the first switch.
- the control unit may specify a switch-off threshold value for the first switch.
- the averaging of the switch current can be done by a low-pass filter, which can detect the time average of the current.
- the switch current can be combined with a PWM signal.
- the PWM signal may be low frequency in proportion to the frequency of the switch current.
- a second switch may enable a current path between the first sense resistor and the low pass filter only during a turn-on period of the PWM signal, and interrupt the current path during a turn-off period of the PWM signal. During the turn-off period, the averaged, low-pass-filtered, switch current can be held.
- the control unit may evaluate the averaged switch current during the turn-off period of the PWM signal.
- the control unit may control a duty cycle of the PWM signal.
- the control unit may adjust the turn-off threshold for the first switch depending on the averaged switch current.
- the control unit may be supplied with a signal representing the supply voltage, a signal representing the averaged switch current, a signal representing the voltage across the LED and / or a signal representing the difference between the supply voltage and the measurement voltage.
- the control unit can control the second switch.
- the second switch may disconnect the low-pass filter from the first sense resistor when the controller detects a zero crossing, particularly the drop in current in the inductor or inductor.
- the invention provides a luminaire having an LED track and an operating circuit as described above.
- the invention provides a method of operating an LED track with at least one LED, wherein a power supply voltage is applied to the power circuit at at least one input side terminal, and the operating circuit comprises a coil and a first switch clocked by a control unit.
- an energy is intermediately stored which, in the case of a non-conductive first switch, discharges via a diode and across the LED path, wherein a capacitor is arranged parallel to the LED path and the LED is connected while the LED is connected the phase of discharging the coil maintains the current through the LED, and wherein the control unit determines the switch current through the first switch on a first measuring resistor, preferably the supply voltage to a second measuring resistor and preferably a measuring voltage the LED track at a third Determined measuring resistance and calculated from the LED current through the LED route.
- the invention also relates to an operating circuit for an LED track with at least one LED, wherein the
- Operating circuit has a coil and a high-frequency clocked by a control unit first switch, wherein in conductively-switched first switch in the coil, an energy is stored, which discharges in pronounceleitconnect- switched first switch via a diode and the LED route, the high-frequency clocking of the first switch is combined with a PWM signal, wherein the
- the control unit is adapted to determine the switch current through the first switch at a first measuring resistor, wherein the averaged, in particular
- switch current is detected and the averaged, in particular low-filtered, switch current is detected only during the turn-on period of the PWM signal.
- the invention also relates to an operating circuit for an LED track with at least one LED, wherein the operating circuit by a clocked converter, such as a buck converter (buck converter), boost converter (boost converter), flyback converter (inverter) or buck-boost converter, is formed for the operation of at least the LED track.
- a clocked converter such as a buck converter (buck converter), boost converter (boost converter), flyback converter (inverter) or buck-boost converter
- FIG. 1 shows a circuit arrangement according to the invention.
- FIG. 1 shows a circuit arrangement - inter alia - a buck converter (buck converter) for the operation of at least the LED track (with one or more series-connected LEDs), with a first switch LS, which also serves as a converter switch Buck converter as an example of a clocked converter, can be called.
- the circuit arrangement also referred to below as the operating circuit, is supplied with a DC voltage or a rectified AC voltage V bus .
- the DC voltage or a rectified AC voltage V bus can be fed via a mains rectifier directly from an AC voltage network or by the interposition of an active power factor correction circuit or via a DC-DC converter, for example, a potential-separated DC-DC converter.
- a capacitor C bus is arranged.
- a first measuring resistor v b usshunt is connected to the supply voltage V bus via a first resistor Rv b us.
- Rv b usstmn the supply voltage V bus from a control unit SE (eg, a microcontroller, an ASIC, an IC, ...) are detected.
- a choke winding ZX also referred to as choke ZX
- the charging and discharging processes (magnetization and demagnetization) of the coil L buck can be detected in a measuring circuit.
- zero crossings ie a demagnetization and thus discharge of the coil L buck to the zero level, can be detected.
- This can be done for example by the control unit SE, for example by the current I Lb uck is detected by the coil, for example on the inductor winding ZX.
- the demagnetization of the coil L buck which is connected to the drop of the current I L uck back to zero, by means of a voltage monitoring to throttle winding ZX be detected by due control unit SE.
- a third measuring resistor R VL EDShunt is connected via a further resistor R VLED , to which a measuring voltage V LED can be detected by the control unit SE.
- the LED voltage can thus be determined. It results from the difference between the supply voltage V bus and the measured voltage V LED determined at the third measuring resistor.
- a second switch FS is connected to its potential- lower side between the first switch LS and the second measuring resistor R ShUnt via a further resistor, via which a filter of the first order (low-pass) can be switched on or off ,
- the first switch is driven via a driver circuit LS DRV with a driver voltage V gate
- the second switch FS is driven via a driver circuit with the voltage V duty
- the respective control can also be effected by a control unit SE, wherein, for example, the driver circuit LS DRV and / or the driver circuit with the voltage V duty can be part of the control unit SE.
- the low pass filter LPF is now used to at the second measuring resistor Rs hu t sensed switch current I LS n time to average. Namely, the invention provides the following for measuring the LED current I LED as an actual value:
- the switch current I LS through the first switch LS is detected when the first switch LS on the second measuring resistor Rs h un t .
- This current increases substantially linearly during the switch-on time phase of the first switch LS and drops to zero when the switch LS is opened.
- the current through the coil L buck thus shows a zigzag-shaped time course: when the first switch is turned on, the current shows a rising edge, with the first switch turned off there is a falling edge.
- the switch current I LS is therefore zero before it rises again when the first switch LS is switched on again.
- the switch LS is turned off when a shutdown threshold (stored, for example, in the control unit SE) is reached.
- This switch current profile I LS is now averaged by being supplied to the low-pass circuit TPF.
- the averaging switch current I LS is detected.
- the high-frequency, approximately zigzag course of the LED current I LED (in the exemplary embodiment, the LED current I LED drops to zero by the coil L buck before being switched on again, which corresponds to operation in the so-called "borderline mode") can be combined be with a relatively low-frequency PWM control (LF PWM, low-frequent PWM).
- LF PWM low-frequency PWM control
- a large fluctuation range of the current can in fact have a disadvantageous effect on LEDs, since the spectrum of the emitted radiation changes with the change in the current amplitude. Light can change.
- a pulse modulation method for example the PWM (Pulse-Width Modulation) method.
- the LEDs are supplied by the operating circuit with low-frequency (typically with a frequency in the range of 100-1000 Hz) pulse packets with (in the time average) constant current amplitude.
- the electricity within one Pulse packets are superimposed on the above-mentioned high-frequency ripple.
- the brightness of the LEDs can now be controlled by the frequency of the pulse packets; For example, the LEDs can be dimmed by increasing the time interval between the pulse packets.
- the high-frequency clocking of the first switch LS is combined with a PWM signal, wherein the frequency of the PWM signal is low-frequency in relation to the frequency of the high-frequency clocking of the first switch (LS).
- the frequency of the high-frequency clocking and the low-frequency PWM signal are matched to one another in order to avoid flickering effects.
- the frequency of the high-frequency clocking may be an integer multiple of the frequency of the low-frequency PWM signal.
- the amplitude of the rib should be as small as possible within a pulse packet.
- the switch can be operated in a high-frequency PWM mode.
- the duty cycle for the high-frequency clocking of the first switch is set depending on the average value of the determined LED current or switch current at a fixed predetermined frequency.
- a maintenance of the current through the LED can be done by the parallel connection of a capacitor C LED , as will be explained later.
- the adjustment of the current through the LED can be done by appropriate selection of the turn-on and turn-off times.
- these times may be selected such that the first switch LS is turned on when the current falls below a certain minimum reference value and the switch is turned off when the current exceeds a maximum reference value (turn-off threshold).
- the minimum reference value can also be zero. Therefore, it is contemplated that the current path between the second sense resistor R shun in series with the first switch LS, the converter switch, toward the low-pass filter TPF is enabled only during the turn-on period of the low-frequency PWM signal.
- the current path is interrupted so that the resulting low-pass filtered (averaged) signal is maintained and thus an evaluation of the mean value in the turn-off period of the low-frequency PWM signal can be performed by the control unit.
- the LED current I LED can be determined by referring (eg, dividing or otherwise correlating) the power transmitted through the converter to the LED voltage.
- the transmitted power is calculated by the determined at the first measuring resistance supply voltage V bus , which is multiplied by the time-averaged switch current I LS . This can again be done by the control unit SE, for example.
- the LED voltage is determined for example by means of a measurement on the third measuring resistor RvLEDShunt, which is connected in series with the LED track LED.
- the LED voltage results from the difference between the supply voltage V bus and the measured voltage V LED determined at the third measuring resistor.
- the control unit SE could measure the LED voltage but also, for example, by measuring a voltage on the coil L buck during the turn-off of the first switch LS, for example by means of a voltage measurement on the inductor winding ZX during the demagnetization phase of the coil L buck .
- the voltage across the coil L buck corresponds to the sum of the voltages across the diode Dl and the LED voltage.
- the LED current I LED is indirectly determined by calculating the transmitted power and the indirect determination of the LED voltage.
- the investigations and / or the calculations are preferably carried out by the control unit SE. It can also be included in the calculation of the transmitted power, a correction factor that includes, for example, the switching behavior or the losses of the converter.
- the calculated LED current can thus be used as actual value variable for a regulation of the LED current.
- the turn-on time T on of the first switch LS of the (buck) converter can be used as the control variable for the control.
- the duty cycle of the low-frequency PWM drive if present, can be used.
- the switch-off threshold for the first switch LS in the control unit SE can be shifted depending on the mean value of the switch current I LS .
- the duty cycle of the low-frequency PWM control can be fixed at least in a partial range of the LED operation, for example at high brightness, at 100% duty cycle or near this range. In this area, the height of the LED current and thus the brightness of the LED can be influenced by adjusting the switch-off threshold for the first switch LS and thus via the control variable the switch-on time T on of the converter.
- the control unit SE are thus preferably a signal representing the supply voltage V bus , a signal representing the time average of the switch current I LS (in the on time periods of the low-frequency PWM modulation, if present), and / or a signal which supplies the supply voltage V bus minus the voltage V LED detected at the third measuring resistor R V LEDSchunt.
- control unit SE can also selectively enable the low-pass filter TPF via activation of the second switch FS (eg during the switch-on period of the PWM signal) or disconnect (eg during the switch-off period of the PWM signal) , ie the path between the second measuring resistor R S hunt the first switch LS and the low-pass filter TPF.
- the optional capacitor C LED parallel to the LED track LED is known as such and can serve to avoid that the LED current identically traces the course through the coil L buck .
- non-conductive switched first switch LS in particular during the phase of demagnetization of the coil L Buck , the current through the LED due to the cached in the capacitor C LED energy can be maintained.
- it is disadvantageous in terms of the spectrum of the LED track LED if the LED current performs such large strokes (except for a pure PWM drive between 0 and 1, then only one current flows at 1).
- the low-frequency PWM signal need not be generated by the control unit itself, but it can be supplied from outside, for example by an externally supplied PWM control signal, and then of course the release / disconnecting element, the second switch FS, for the low-pass filter TPF be supplied.
- the enable / Abtrenn beneficiary for the connecting element, the second switch FS, TPF and the second measuring resistor Rs h u nt vary the effect assfilter between low of a PW -Einschaltimpuls that the "separation" only takes place when a zero crossing or the falling of the current is detected through the coil L buck to zero.
- This can be through the choke coil ZX, eg via a pin on the choke winding ZX, by the control unit SE. This ensures that the averaging window for the low-pass circuit TPF always covers complete triangular waveforms of the coil current.
- the coil L buck can also be arranged between the second capacitor C LED and the LED track LED.
- the deep merelyfilter TPF and the second switch FS can optionally be integrated into the control unit SE.
- 2 shows by way of example the current I LS through the first switch LS, the average current I LS , which is determined by the low-pass filter TPF, the current profile I Lbuck: at the coil L buck and a low-frequency PWM signal LF PW.
- the detection of the switch current according to the invention only during the turn-on period of the low-frequency PWM signal can also be used in a simplified embodiment, if only the switch current but not the LED voltage and / or the supply voltage for determining the LED current is considered , This can be the case, in particular, when the LED voltage and / or the supply voltage are fixed. So the LED voltage can be known if the number of LEDs of the LED range is known.
- the supply voltage can, for example, when upstream of an active
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATGM385/2012U AT13687U1 (de) | 2012-09-28 | 2012-09-28 | Betriebsschaltung mit getaktetem Konverter zur Ansteuerung einer LED-Strecke |
| DE201210217748 DE102012217748A1 (de) | 2012-09-28 | 2012-09-28 | Betriebsschaltung mit getaktetem Konverter zur Ansteuerung einer LED-Strecke |
| PCT/AT2013/000157 WO2014047668A2 (de) | 2012-09-28 | 2013-09-30 | Betriebsschaltung mit getaktetem konverter zur ansteuerung einer led-strecke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2901816A2 true EP2901816A2 (de) | 2015-08-05 |
| EP2901816B1 EP2901816B1 (de) | 2017-11-08 |
Family
ID=50389065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13841314.1A Active EP2901816B1 (de) | 2012-09-28 | 2013-09-30 | Betriebsschaltung mit getaktetem konverter zur ansteuerung einer led-strecke |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2901816B1 (de) |
| WO (1) | WO2014047668A2 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110678764A (zh) * | 2018-01-30 | 2020-01-10 | 株式会社Lg化学 | 用于诊断继电器驱动电路的设备 |
| EP4345211A1 (de) | 2022-09-29 | 2024-04-03 | Apison | Vorrichtung zum verdichten von materialien |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202015101996U1 (de) * | 2015-04-22 | 2015-05-11 | Tridonic Gmbh & Co Kg | Getakteter Wandler für dimmbare Leuchtmittel mit dynamisch einstellbarem Filter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006034371B4 (de) * | 2006-04-21 | 2019-01-31 | Tridonic Ag | Betriebsschaltung und Betriebsverfahren für Leuchtdioden |
| US7550934B1 (en) * | 2008-04-02 | 2009-06-23 | Micrel, Inc. | LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response |
| US8344638B2 (en) * | 2008-07-29 | 2013-01-01 | Point Somee Limited Liability Company | Apparatus, system and method for cascaded power conversion |
| JP5760169B2 (ja) * | 2010-10-25 | 2015-08-05 | パナソニックIpマネジメント株式会社 | 点灯装置および、これを用いた照明器具 |
-
2013
- 2013-09-30 WO PCT/AT2013/000157 patent/WO2014047668A2/de not_active Ceased
- 2013-09-30 EP EP13841314.1A patent/EP2901816B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014047668A3 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110678764A (zh) * | 2018-01-30 | 2020-01-10 | 株式会社Lg化学 | 用于诊断继电器驱动电路的设备 |
| CN110678764B (zh) * | 2018-01-30 | 2021-08-31 | 株式会社Lg化学 | 用于诊断继电器驱动电路的设备 |
| EP4345211A1 (de) | 2022-09-29 | 2024-04-03 | Apison | Vorrichtung zum verdichten von materialien |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2901816B1 (de) | 2017-11-08 |
| WO2014047668A3 (de) | 2014-06-26 |
| WO2014047668A2 (de) | 2014-04-03 |
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