EP2416625A1 - Verfahren zur Steuerung von Leuchtdioden - Google Patents
Verfahren zur Steuerung von Leuchtdioden Download PDFInfo
- Publication number
- EP2416625A1 EP2416625A1 EP11172807A EP11172807A EP2416625A1 EP 2416625 A1 EP2416625 A1 EP 2416625A1 EP 11172807 A EP11172807 A EP 11172807A EP 11172807 A EP11172807 A EP 11172807A EP 2416625 A1 EP2416625 A1 EP 2416625A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulse
- voltage
- light
- emitting diodes
- calibrated
- 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
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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
- 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]
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- 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]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- LEDs are increasingly used for the implementation of lighting and / or signaling functions of motor vehicles.
- LEDs are associated in an optical unit and supplied synchronously to perform the aforementioned functions.
- the aforementioned groups of LEDs lend themselves satisfactorily to such a mode of operation.
- control by means of a modulation of duration, called width, electrical current pulses feeding them.
- the width modulation of the pulses, pulses of electrical voltage transformed into electrical current pulses by the internal impedance of the aforementioned LEDs, is obtained for example from a DC-DC voltage converter, which is associated with a control circuit. switching controlled by a gradual control signal and to adjust accordingly the duty cycle and therefore the width of the power supply pulses LEDs, and finally the electrical energy supplied to them and thus the light intensity lighting groups of LEDs and powered.
- the switching control circuit having a proportional and integral control loop of the voltage level of the pulses, the dynamic, that is, that is, the limited response time of the assembly thus formed generates steady-state settling times of the supply of the LEDs that are too slow.
- the duty cycle of the supply pulses being adjusted to a value less than a value of the order of 20%, the rise time too high. pulses degrades the average value of the LED supply current, which is no longer equal to the product of the value of the amplitude of the pulses in steady state and the value of the duty cycle selected for the application of the control gradual. This results in a non-linearity of the gradual control, source of inaccuracy of this command.
- the average value of the LED supply current depends on the supply voltage.
- an analog capacitance circuit R2C2 as shown in FIG. figure 1 , taking up the figure 2 of the aforementioned patent, controlled by a switch T2 allows in fact to sample and store the maximum value of the amplitude of the pulses for the next pulse.
- the present invention aims to overcome the disadvantages of the device of the prior art.
- an object of the present invention is the implementation of a method of gradually controlling the LED illumination light intensity for supplying the LEDs conditionally to the determination of the steady state of the power supply pulses. the latter, which reduces substantially, if not remove, any inaccuracy of the gradual control of the lighting intensity finally obtained at low light values.
- Another object of the present invention is the implementation of a device for gradually controlling the LED illumination light intensity using a conventional DC-DC converter, which is associated with a conventional switching control circuit in the same direction. absence of necessary electrical referencing of the latter to the ground voltage.
- the method for gradually controlling the luminous intensity of illumination of light-emitting diodes by modulation of the pulse width of electrical current with a given duty cycle which is the subject of the invention, is implemented from a DC voltage converter. -continu and a control circuit for switching the power supply current of the light emitting diodes.
- the method which is the subject of the invention is furthermore remarkable in that the step of determining the established speed of each pulse comprises detecting the amplitude level of each pulse with respect to a reference value.
- the method which is the subject of the invention is also remarkable in that the step of determining the established speed of each pulse comprises the calculation of the establishment time of the established speed of each pulse.
- the method which is the subject of the invention is finally remarkable in that for a switching control circuit comprising a proportional and integral servocontrol loop of the electrical voltage level of the pulses, this consists in calculating the establishment time of each pulse, and shifting the application of each calibrated pulse to the light emitting diodes with a delay time substantially equal to the establishment time.
- the device for gradually controlling the light intensity of illumination of light-emitting diodes by modulation of the pulse width of a given duty cycle which is the subject of the invention, comprises a DC-DC voltage converter and a DC switching control circuit. current supply pulses of the light-emitting diodes.
- the device which is the subject of the invention is furthermore remarkable in that the resources for determining the established speed of each pulse comprise means for detecting the amplitude level of each pulse with respect to a reference value.
- the device that is the subject of the invention is also remarkable in that the resources for determining the established speed of each pulse comprise means for calculating the establishment time of each pulse.
- the device which is the subject of the invention is finally remarkable in that, for a switching control circuit comprising a proportional and integral control loop of the pulse voltage level, this comprises means for calculating the rise time of the pulse. each pulse, and a circuit for delaying the application of each pulse calibrated to the light-emitting diodes with a delay time substantially equal to the rise time of each pulse.
- the y-axis is graduated in relative amplitude AR, in fact representing the high and low levels of the different signals, and the x-axis is graduated in time, 1 cm representing 100 ⁇ s.
- the aforementioned method preferably concerns, but is not limited to, the gradual control of the light intensity of lighting of light-emitting diodes by pulse width modulation of electric current, the duty cycle of which is determined, depending on the use, in particular when this duty cycle is less than 20% for example, from a DC-DC voltage converter and a control circuit of switching of the power supply current of the light-emitting diodes.
- the aforesaid step is followed by a step of determining the established regime VE of each pulse to generate a calibrated voltage pulse IC whose voltage level corresponds substantially to the level of steady state pulses.
- a step of determining the established regime VE of each pulse to generate a calibrated voltage pulse IC whose voltage level corresponds substantially to the level of steady state pulses.
- On the figure 2 B represents the establishment of the determined duty cycle pulse corresponding to the gradual control generated by the curve A, this establishment, noted as Establishment, being deemed to correspond to the establishment of the current of a resistance-capacitance circuit, as will be described later in the description.
- the method that is the subject of the invention consists in supplying the light-emitting diodes with the electroluminescent diodes by applying the calibrated pulse IC to the light-emitting diodes, by means of the switching control circuit. It is understood, in particular, that on reaching the set speed VE voltage switching to generate the calibrated pulse IC is performed without appreciable delay, the aforementioned voltage pulse for supplying the LEDs, according to the curve D shown in FIG. figure 2 which represents the current timing diagram of intensity IL delivered to the LEDs.
- the step of determining the established speed of each pulse comprises detecting the amplitude level VE of each pulse. , vis-à-vis a reference value.
- the step of determining the established speed of each pulse comprises the calculation of the time of establishment, denoted t D on the figure 2 of the established regime of each pulse.
- the method which is the subject of the invention can particularly advantageously be implemented for a switching control circuit comprising a proportional and integral servocontrol loop of the electrical voltage level of the pulses, this circuit being reduced to a circuit resistance-capacity, as will be described below in connection with the figure 3 .
- the method according to the invention consists in calculating the establishment time tD of each pulse, and in shifting the power supply of the LEDs by applying each calibrated pulse IC to the latter delayed by a delay period substantially. equal to the establishment time tD.
- the references 5 and 5 designate the input terminals of the battery power supply of the vehicle of the device 1 for gradually controlling the light intensity of illumination of the light-emitting diodes by pulse width modulation determined cyclic object of the invention.
- the reference 5 designates, for example, the mass.
- This device comprises a DC-DC voltage converter 3 and a voltage breeder circuit, called a BOOST circuit, formed by an inductor L1, the switching transistor T1, the diode D and the capacitor C4. It should be noted, in particular, that any voltage breeder circuit of the BUCK, BUCK BOOST, SEPIC or CUK type, for example, and finally any type of DC / DC converter can however be implemented.
- the assembly thus formed must provide successive pulses supplying the load 2 constituted by the LEDs.
- This load is connected to the connection terminals 6 and 6 'and supplies the latter with the regulated current IL as a function of the gradual control applied.
- Other configurations of the aforementioned power supply circuit can be envisaged.
- DC-DC converter 3 To the above-mentioned DC-DC converter 3 is furthermore associated a supply pulse switching control circuit 4.
- the latter is powered by the supply voltage from the connection terminal 41. It comprises an internal reference voltage denoted Vref and a operational amplifier 40 receiving on its positive terminal the reference voltage Vref and whose negative terminal is connected to an input terminal 42 '.
- the switching transistor T1 is controlled by the output 44 of the supply pulse switching control circuit 4.
- the input terminal 7 of the device 1 object of the invention is connected to the input 42 of the control circuit 4 and receives the gradual control signal representative of the pulse width modulation. This signal can be delivered either externally by the input terminal 7, or internally.
- the output terminal 45 of the control circuit 4 is connected to the control input of a switching transistor T3, which is connected in series on the one hand to the load 2 constituted by the LEDs and on the other hand to a resistor R3, itself connected to the 5 'supply terminal of the device 1 object of the invention. It is understood, in particular, that the resistor R3 has the function of measuring and giving an image of the value of the current IL passing through the load 2 constituted by the LEDs.
- the capacitor C4 of the voltage raising circuit is connected on the one hand to the power supply terminal 5 'of the device 1 and, on the other hand, to the load 2 constituted by the LEDs.
- the output of the operational amplifier 40 is connected to the terminal 42 of the power pulse switching control circuit 4 and the terminals 42 and 42 'of the latter are connected by an RC series resistance-capacitor circuit. .
- the terminal 42 ' is further connected by a resistor R' to the common terminal of the switching transistor T3 and the resistor R3.
- the operational amplifier 40 is provided with a switch SW, which makes it possible to synchronize the integration carried out by the aforementioned operational amplifier, the RC circuit and the resistor R 'previously mentioned.
- the operational amplifier 40 controlled by the switch SW makes it possible to compare the voltage VR3 across the resistor R3, image of the current IL, with the internal reference voltage Vref, and then processes the error between the two voltage values by integration according to a proportional and integral loop of the voltage level of the pulses.
- the integration constant is set by the value of the time constant
- the output terminal 44 delivers a voltage value that adapts according to the result of the integration performed by the proportional and integral servocontrol loop.
- Vop (t) denotes the output voltage of the operational amplifier 40.
- the establishment time tD of the figure 2 is generated between the activation of the proportional and integral loop on switching of the switch SW and the delayed effective control of the switching transistor T3.
- the steady state value VE of the voltage pulses can be calculated when VLED, VBAT and the gain M of the DC-DC converter are known.
- the voltage at the terminals of the load 2, VLED varies slowly as a function of the temperature but also in the case where the current in the LEDs is changed, by changing the reference voltage Vref.
- the voltage VLED is also changed from one mode of implementation to another, that is to say for different lighting or signaling functions, when of course we change the type and number of LEDs constituting the charge 2.
- the first phase at the high voltage value of the pulses generated by the gradual control is chosen longer, width of the larger pulse, in order to perform a measurement of the VLED value at the end of this phase.
- Fast electronics can be chosen accordingly.
- the high and low levels of the signals are denoted 0A, 1A; 0B, 1B; 0C, 1C and 0D, 1D for the signals represented by the curves A, B, C, D and IC respectively.
- the establishment time tD2 for 4 LEDs is less than the establishment time tD1 for 10 LEDs, all things being equal, the successive switching times of the switches SW, T3 being represented by dotted lines identified by SW on, T3 on, T3 off.
- the switching control of T3, directly managed by the control circuit 4 causes the drop in intensity of the current IL delivered to the LEDs.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1055735A FR2962877B1 (fr) | 2010-07-13 | 2010-07-13 | Procede de commande de diodes electroluminescentes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2416625A1 true EP2416625A1 (de) | 2012-02-08 |
EP2416625B1 EP2416625B1 (de) | 2013-12-04 |
Family
ID=43608177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11172807.7A Not-in-force EP2416625B1 (de) | 2010-07-13 | 2011-07-06 | Verfahren zur Steuerung von Leuchtdioden |
Country Status (3)
Country | Link |
---|---|
US (1) | US8610370B2 (de) |
EP (1) | EP2416625B1 (de) |
FR (1) | FR2962877B1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012215155A1 (de) * | 2012-08-27 | 2014-02-27 | Robert Bosch Gmbh | Verfahren zum Regeln der Stromstärke des durch einen induktiven Verbraucher fließenden elektrischen Stroms sowie entsprechende Schaltungsanordnung |
FR3056705B1 (fr) * | 2016-09-28 | 2020-07-24 | Valeo Vision | Module d'emission lumineuse a commande amelioree notamment pour vehicule automobile |
WO2018139636A1 (ja) * | 2017-01-30 | 2018-08-02 | ローム株式会社 | パルス制御装置 |
DE102017215241A1 (de) * | 2017-08-31 | 2019-02-28 | Tridonic Gmbh & Co Kg | Schaltregler und Verfahren zum Betreiben von Leuchtmitteln mit Lichtschwankungs-Unterdrückung |
CN111416582B (zh) * | 2020-04-08 | 2023-06-09 | 上海必阳科技有限公司 | 一种运算放大器集成电路输入失调电压自校准电路 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10236872A1 (de) | 2002-08-12 | 2004-03-04 | Hella Kg Hueck & Co. | Schaltungsanordnung zur steuerbaren Stromversorgung, insbesondere Schaltungsanordnung zum Dimmen von Leuchtdiodenanordnungen |
US20060043911A1 (en) * | 2004-08-31 | 2006-03-02 | Jianwen Shao | Method and circuit for driving a low voltage light emitting diode |
US20080150449A1 (en) * | 2006-12-26 | 2008-06-26 | Beyond Innovation Technology Co., Ltd. | Control circuits for dimming control |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6819011B2 (en) * | 2002-11-14 | 2004-11-16 | Fyre Storm, Inc. | Switching power converter controller with watchdog timer |
AU2006352589A1 (en) * | 2006-12-28 | 2008-07-10 | Nokia Corporation | A method and device for driving a circuit element |
US8487546B2 (en) * | 2008-08-29 | 2013-07-16 | Cirrus Logic, Inc. | LED lighting system with accurate current control |
-
2010
- 2010-07-13 FR FR1055735A patent/FR2962877B1/fr not_active Expired - Fee Related
-
2011
- 2011-07-06 EP EP11172807.7A patent/EP2416625B1/de not_active Not-in-force
- 2011-07-12 US US13/180,792 patent/US8610370B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10236872A1 (de) | 2002-08-12 | 2004-03-04 | Hella Kg Hueck & Co. | Schaltungsanordnung zur steuerbaren Stromversorgung, insbesondere Schaltungsanordnung zum Dimmen von Leuchtdiodenanordnungen |
US20060043911A1 (en) * | 2004-08-31 | 2006-03-02 | Jianwen Shao | Method and circuit for driving a low voltage light emitting diode |
US20080150449A1 (en) * | 2006-12-26 | 2008-06-26 | Beyond Innovation Technology Co., Ltd. | Control circuits for dimming control |
Also Published As
Publication number | Publication date |
---|---|
EP2416625B1 (de) | 2013-12-04 |
FR2962877B1 (fr) | 2014-03-21 |
US8610370B2 (en) | 2013-12-17 |
FR2962877A1 (fr) | 2012-01-20 |
US20120025727A1 (en) | 2012-02-02 |
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