EP2201821A2 - Operating circuit for light-emitting diodes and method for operating light-emitting diodes - Google Patents
Operating circuit for light-emitting diodes and method for operating light-emitting diodesInfo
- Publication number
- EP2201821A2 EP2201821A2 EP08840612A EP08840612A EP2201821A2 EP 2201821 A2 EP2201821 A2 EP 2201821A2 EP 08840612 A EP08840612 A EP 08840612A EP 08840612 A EP08840612 A EP 08840612A EP 2201821 A2 EP2201821 A2 EP 2201821A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- current value
- switch
- current
- control unit
- phase
- 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 abstract description 32
- 230000008859 change Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000004804 winding 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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
Definitions
- the present invention relates to a circuit and a method for operating light-emitting diodes by means of switching regulators for providing the operating voltage for the LEDs.
- buck converters buck converters
- a control unit controls a clocked semiconductor power switch, by means of which an inductance is energized in its on state, wherein the energy of the inductor then discharges in the off state of the switch via the light emitting diode path.
- a first buck converter 10 is shown as a basic circuit for LED modules.
- the circuit is an input DC voltage V] _ fed, which of course can be a rectified AC voltage.
- a series connection between a switch 5, for example a semiconductor power switch, in particular a MOSFET, and a freewheeling diode 2 energizes in the switched-on state of the switch 5 an inductance 3 by means of the current flowing through the switch 5.
- the energy stored in the inductance 3 discharges in the form of a current through the at least one light-emitting diode 7
- the current flowing through the at least one light-emitting diode 7 current can be measured at a shunt resistor 6 by a corresponding sensor.
- the disadvantage here is that at the shunt resistor 6, the current can be measured only during the switch-on of the switch 5.
- the current flows through the freewheeling diode 2, the at least one light-emitting diode 7 and the inductance 3 and is not detectable for a sensor connected to the shunt resistor 6.
- Another possibility is to arrange the elements of the circuit so that the current can be detected both in the switch-on phase and in the freewheeling phase.
- a circuit is very expensive.
- the present invention relates to an operating circuit for at least one light-emitting diode, comprising a switching regulator circuit, which is supplied with a DC voltage and provides a supply voltage for the at least one light-emitting diode by means of a switch clocked by a control unit, and a current sensor connected to the control unit for detecting the at least a light emitting diode during the current Switch-on phase of the switch, wherein the control unit determines the time duration between a switch-off and a subsequent switch-on of the switch depending on the current detected by the current sensor during the switch-on.
- the present invention further relates to a method for operating at least one light-emitting diode by means of a switching regulator circuit, which is supplied with a DC voltage and provides a supply voltage for the at least one light-emitting diode by means of a clocked switch, comprising the steps of detecting the light emitted by the at least one light-emitting diode (LED). flowing current during the switch-on phase of the switch and determining the time duration between a switch-off and a subsequent switch-on of the switch depending on the current detected during the switch-on phase.
- a switching regulator circuit which is supplied with a DC voltage and provides a supply voltage for the at least one light-emitting diode by means of a clocked switch, comprising the steps of detecting the light emitted by the at least one light-emitting diode (LED). flowing current during the switch-on phase of the switch and determining the time duration between a switch-off and a subsequent switch-on of the switch depending on the current detected during the
- control unit calculates the current value at the end of the freewheeling phase of the switch by means of at least one current value detected by the current sensor.
- control unit compares the calculated current value at the end of the freewheeling phase with a predetermined setpoint value.
- control unit advantageously does not change the time duration between a switch-off and a subsequent switch-on of the switch if the calculated current value at the end of the free-running phase corresponds to the setpoint value.
- control unit increases the time duration between a switch-off and a subsequent switching-on of the switch if the calculated current value at the end of the free-running phase is greater than the setpoint value.
- control unit advantageously increases the time duration between a switching off and a subsequent switching on of the switch if the calculated current value at the end of the freewheeling phase is less than the setpoint value.
- the control unit preferably waits for a blanking time tbik starting with the switch-on phase of the switch and detects a first current value immediately after the blanking time by means of the current sensor.
- control unit determines a second current value at the end of the switch-on phase and the control unit calculates the current value at the end of the free-running phase by means of the first and second current values
- I A is the current value at the end of the freewheeling phase
- I B is the first current value
- I D is the second current value
- the control unit after detecting the first current value, the control unit again waits for the duration of the blanking time and detects a third current value immediately after the second blanking time and that the control unit calculates the current value at the end of the freewheeling phase by means of the first and third current values
- I A 2 * I B - Ic, where I A is the current value at the end of the freewheeling phase, I B is the first current value and I c is the third current value.
- control unit determines the time duration between switching off and subsequent switching on of the switch as a function of the rise in the current detected by the current sensor during the switch-on phase.
- 1 shows a first known buck converter for light-emitting diodes
- 2 shows a typical current profile through a light-emitting diode module in a Buck converter
- FIG 3 shows an operating circuit according to the invention for light-emitting diodes
- FIGS. 4 and 5 show details regarding the
- FIG. 6 shows a flow chart with the steps of the method according to the invention for operating the light-emitting diode module
- Fig. 7 shows another invention
- Fig. 2 shows the typical voltage and current waveforms in a Buck converter, or in the case of a square wave voltage.
- the time along the X-axis is shown for this purpose and along the Y-axis is the voltage curve or the current profile through the at least one light-emitting diode 7.
- the operating circuit is supplied with a Recheckbeginn, ie during the switch-on phase E of the switch 5 over a period t Qn the operating circuit is supplied with a certain voltage, and during a freewheeling phase F over a period of time tgff, during which the switch 5 is open, the circuit is not powered by the voltage source.
- a Recheckbeginning phase E of the switch 5 the current through the at least one light-emitting diode 7 increases and during the following free-wheeling phase F the current through the at least one light-emitting diode 7 decreases again.
- FIG. 3 shows an operating circuit 1 according to the invention for the operation of at least one light-emitting diode 7.
- the circuit here corresponds to the first buck converter 11, as shown in FIG. 1 and already explained.
- a sensor 12 is additionally provided, which is suitable for detecting the current measured by means of the shunt resistor 6 and forwarding the value to a control unit 13.
- the control unit 13 actuates the switch 5 and is furthermore suitable for determining the switch-off time duration tgff and the switch-on time duration t Qn of the switch 5 on the basis of the measured current values transmitted by the sensor 12. The determination of the switch-off time tQff by the control unit 13 will be explained in detail below.
- FIG. 4 again shows the voltage and current profile in a light-emitting diode module.
- a first way to be able to infer the current I ⁇ at the end of the free-running time is, after the blanking time, ie the blanking time tkik, to measure a first current value Ig.
- t ⁇ i ⁇ is much smaller than tQn unc * thus the current Ig measured after the blanking time corresponds approximately to the current I ⁇ at the end of the freewheeling time.
- the thus calculated current value at the end of the freewheeling phase I ⁇ is compared with a setpoint value and if I ⁇ is greater than the desired setpoint, then the next clock increases the time period tQff between a switch-off and a subsequent switch-on. If the current I ⁇ is smaller than the desired value, on the other hand tQff is shortened at the next cycle. Corresponds to the current I ⁇ possibly within predetermined tolerance values the desired value, it is left unchanged at the next clock tgff.
- the method can then be used if the blanking time index is not negligible compared to the switch-on time tQn and the above-assumed approximation does not allow the accuracy requirements for I ⁇ to be satisfied or in the case that I1 must be determined particularly accurately. For this case, it is possible to measure a second current value I Q at the end of the switch-on phase E.
- the current I ⁇ at the end of the freewheeling phase can then be calculated as follows:
- This calculation is based on the principle that the current after switching on the switch 5 increases linearly and thus can be calculated back by two measurements of the current waveform I Q and I Q to the current I ⁇ at the end of the freewheeling phase.
- the computational effort for the above-mentioned second method is relatively complicated, especially in a digital circuit, since both division and multiplication must be performed.
- a third method is proposed, which is based on the measurement of a third current value I Q.
- This is shown schematically in FIG. 5.
- the blanking time t ⁇ i ⁇ is also waited for and then the first current value at the end of the blanking time Ig is detected. Subsequently, the blanking time t ⁇ i ⁇ is again waited and the third current value I Q detected. Since the difference between I 0 and I B , ie
- I A can be calculated from:
- the current value I ⁇ at the end of the freewheeling phase can be calculated relatively simply, since the calculation in the digital domain is reduced to a bit shift as well as a subtraction.
- the present invention ensures that the current flow through the at least one light-emitting diode 7 never drops to zero, ie, the invention relates in particular to the continuous conduction mode. This results in the smallest possible ripple of the current flow through the at least one light emitting diode. 7
- the inventive method is shown in the overview in Fig. 7 again schematically.
- step SO begins in step SO with the end of the freewheeling phase F.
- step Sl the control unit 13 outputs the signal for the switch-on phase to the switch 5.
- step S2 the blanking time, i. H. the blanking time waited.
- step S3 which can also consist of several substeps, at least one current value, i. a measured value of the current during the switch-on, by the shunt resistor 6 and the sensor 12 was added.
- control unit calculates the return flow based on the transmitted current values, i. H. the current I ⁇ at the end of the freewheeling phase.
- Step S5 checks whether the return flow corresponds to a predetermined desired value. If this is the case, no change in the switch-off time tgff is made in the following step S7.
- step S5 if it is determined in step S5 that the return flow I ⁇ does not correspond to a desired value, it is checked in the following step S6 whether the return flow I ⁇ is greater than the desired value. If so, in a following step S9 the next off time is increased, otherwise in a following step S8 the following off time is reduced.
- the turn-off time is the time period between the turn-off and the subsequent turn-on of the switch 5. The process ends in step S10.
- the calculation made in step S4 can in this case be based on one of the three methods mentioned, depending on the presettings and the recorded measured values.
- Another possibility of the regulation is that the increase in the current value detected by the current sensor 6, 12 is evaluated. The difference between the current value at the beginning and at the end of the switch-on phase is determined. From the rise of the current can be closed to the size of the inductor 3 or the forward voltage of the LED 7. If the size of the inductor 3 or the forward voltage of the light-emitting diode 7 are known, it is possible to deduce the switch-off time t Off required for reaching a return current I A.
- the current through the switch S results from the quotient of voltage across the inductance 3 and the value of the inductance 3 multiplied by the switch-on time.
- the drop in the current in the freewheeling path results from the quotient of voltage across the inductance 3 and the value of the inductance 3 multiplied by the switch-off time. Since during the freewheeling phase the voltage across the inductance corresponds approximately to the voltage across the light emitting diode 7 (the difference results from the forward voltage the freewheeling diode 2).
- both the forward voltage of the light-emitting diodes 7 and the inductance 3 can be determined.
- the determination of the required turn-off time is simplified. But it is also possible to measure the voltage across the inductor 3 or the LED 7 during operation.
- the switch S is turned on, according to the circuit of FIG. 3, the voltage across the inductance 3 can be measured via a voltage measurement at the connection point between the inductance 3 and the light-emitting diode 7. If both components are interchanged, the forward voltage across the light emitting diode 7 can be measured in a simple manner. Such a voltage measurement can also be used for fault detection. Thus, for example, an error of the light-emitting diode 7 or even a fault caused by a fault in the wiring of the light-emitting diode 7 such as a short circuit can be concluded.
- a temporal monitoring of the detected current values can be carried out. If a change in the detected current values is detected, it is possible to infer a possible fault or also an aging of the light-emitting diode 7 or of other components. Also for the calculation of the required turn-off time t Off on the basis of the increase of the current through the switch S during a switch-on phase E, the already explained method of taking into account the blanking times tbik can be used.
- the determination of the inductance 3 or the forward voltage of the LED 7 can be corrected or completed.
- the required time duration t Off which is necessary to reach a certain current value I A at the end of the freewheeling phase F, can be calculated.
- the actually achieved current value I A at the end of the freewheeling phase F can then be compared with a predefined setpoint value and the time period t off can be adjusted again.
- Such a digital circuit advantageously has at least one analog-to-digital converter for detecting the current and voltage values, a computing block for processing and calculating the corresponding values, and a memory register for storing the measured values and calculated values.
- An advantageous design of the operating circuit according to the invention can be designed so that only the current for the regulation of the current through the light emitting diode 7 during the switch-on phase is measured and evaluated, while an existing voltage detection is used only for an error shutdown.
- a comparator for monitoring the voltage of the light emitting diode 7 or the voltage across the inductance 3 can be used, whereby a cost-effective circuit can be constructed.
- the circuit 7 shows a further operating circuit 1 according to the invention for the operation of at least one light-emitting diode 7.
- the circuit here corresponds to a buck-boost converter 110.
- the current through the switch 5 is measured by means of the shunt resistor 6 and the value is sent to a control unit 13 forwarded.
- the control unit 13 actuates the switch 5 and is furthermore suitable for correspondingly determining the switch-off time duration tgff and the switch-on time duration tgn of the switch 5 on the basis of the measured current values transmitted by the shunt resistor 6.
- the inductance 3 is magnetized.
- the switch-off phase F over a period of time toff, the inductance 3 is demagnetized, the current flowing through the light-emitting diode 7 and the diode 2.
- the inventive method can be used for all circuit topologies for the operation of light-emitting diodes, in which no direct measurement of the Current through the LEDs is possible because the LEDs are not directly connected to ground, but are connected to a variable to ground potential.
- This method can therefore also be used in operating circuits with potential separation, wherein during a switch-on phase E an inductance 3 is magnetized and is demagnetized in a subsequent switch-off phase F while driving a current through at least one light emitting diode 7.
- the inductor 3 may have a secondary winding through which it outputs its energy during the turn-off phase F, whereby the potential separation is achieved in the circuit.
- Such a circuit may be, for example, a forward converter.
- the current is detected and evaluated by a switch (and the current increase) during a switch-on phase E and the necessary switching behavior of the switch 5 (for example, the (switch-off) time period t of f) is determined
- the present operating circuit and the present method for operating at least one light-emitting diode thus yields that regardless of the load, for example, regardless of the number of light-emitting diodes supplied, the current profile is always between a value I max and a value - "- held min, ie that always with the same value I mj _ n > 0, the switch 5 is switched on again
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007049533.3A DE102007049533B4 (en) | 2007-10-16 | 2007-10-16 | Operating circuit for light-emitting diodes and method for operating light-emitting diodes |
PCT/EP2008/008729 WO2009049876A2 (en) | 2007-10-16 | 2008-10-15 | Operating circuit for light-emitting diodes and method for operating light-emitting diodes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2201821A2 true EP2201821A2 (en) | 2010-06-30 |
EP2201821B1 EP2201821B1 (en) | 2017-09-13 |
Family
ID=40458730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08840612.9A Active EP2201821B1 (en) | 2007-10-16 | 2008-10-15 | Operating circuit for light-emitting diodes and method for operating light-emitting diodes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2201821B1 (en) |
CN (1) | CN101828428A (en) |
AT (1) | AT516957B1 (en) |
DE (1) | DE102007049533B4 (en) |
WO (1) | WO2009049876A2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009027484A1 (en) | 2009-07-06 | 2011-01-13 | Osa Opto Light Gmbh | Circuit arrangement for dimming light source, has radiation-emitting semiconductor component and pre-connection with component |
DE102011088966A1 (en) | 2011-12-19 | 2013-06-20 | Tridonic Gmbh & Co. Kg | Operating circuit for light-emitting diodes and method for operating light-emitting diodes |
AT13857U1 (en) * | 2013-04-30 | 2014-10-15 | Tridonic Gmbh & Co Kg | Error detection for LEDs |
US20230336171A1 (en) * | 2020-06-04 | 2023-10-19 | Panasonic Intellectual Property Management Co., Ltd. | Circuit for switching device, switching system, and processing method for switching device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI106770B (en) * | 1999-01-22 | 2001-03-30 | Nokia Mobile Phones Ltd | Illuminating electronic device and illumination method |
US20050151708A1 (en) * | 2004-01-12 | 2005-07-14 | Farmer Ronald E. | LED module with uniform LED brightness |
US7378805B2 (en) * | 2005-03-22 | 2008-05-27 | Fairchild Semiconductor Corporation | Single-stage digital power converter for driving LEDs |
US7259525B2 (en) * | 2005-11-03 | 2007-08-21 | System General Corporation | High efficiency switching LED driver |
-
2007
- 2007-10-16 DE DE102007049533.3A patent/DE102007049533B4/en not_active Expired - Fee Related
-
2008
- 2008-10-15 CN CN200880112068A patent/CN101828428A/en active Pending
- 2008-10-15 WO PCT/EP2008/008729 patent/WO2009049876A2/en active Application Filing
- 2008-10-15 EP EP08840612.9A patent/EP2201821B1/en active Active
- 2008-10-15 AT ATA9322/2008A patent/AT516957B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2009049876A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP2201821B1 (en) | 2017-09-13 |
CN101828428A (en) | 2010-09-08 |
WO2009049876A2 (en) | 2009-04-23 |
AT516957A5 (en) | 2016-10-15 |
WO2009049876A3 (en) | 2009-07-23 |
DE102007049533B4 (en) | 2017-02-23 |
AT516957B1 (en) | 2016-10-15 |
WO2009049876A9 (en) | 2009-06-11 |
DE102007049533A1 (en) | 2009-04-23 |
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