CN101828428A - 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 diodes Download PDFInfo
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- CN101828428A CN101828428A CN200880112068A CN200880112068A CN101828428A CN 101828428 A CN101828428 A CN 101828428A CN 200880112068 A CN200880112068 A CN 200880112068A CN 200880112068 A CN200880112068 A CN 200880112068A CN 101828428 A CN101828428 A CN 101828428A
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- 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
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- 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]
Abstract
The present invention relates to an operating circuit for at least one light-emitting diode (7), having a switched-mode regulator circuit, which is supplied with a DC voltage and uses a switch (5) clocked by a control unit (13) to provide a supply voltage for the at least one light-emitting diode (7), and a current sensor (6, 12), connected to the control unit (13), for sensing the current flowing through the at least one light-emitting diode (7) during the turned-on phase (E) of the switch (5), the control unit (13) determining the period (toff) between the switch (5) being turned off and subsequently turned on on the basis of the current sensed by means of the current sensor (6, 12) during the turned-on phase (E). The present invention also relates to a method for operating at least one light-emitting diode (7).
Description
Technical field
The present invention relates to circuit and method that the switching regulaor of the operating voltage by being used to adjust light-emitting diode (LED) comes operating light-emitting diodes (leds).
Background technology
Use switching regulaor especially step down voltage redulator (step-down controller) to control light-emitting diode be known basically.At this moment, control unit is being controlled the semiconductor power switch with timeticks, switches on to inductor at the switch conduction state whereby, and here, the inductor electric energy is discharged by the light-emitting diodes line segments under the switch cut-off state subsequently.
Therefore, the current curve that the ripple about stable mean value changes has appearred in light-emitting diode, the increase slope of led current wherein occurs at the switch conduction state, the reduction slope of led current occurs in the switch cut-off state.
Therefore, led current mean value in time can be adjusted by the corresponding timeticksization of power switch.Correspondingly, in order to adjust the current average of light-emitting diode, must also detect the electric current of the light-emitting diode of flowing through.
Fig. 1 schematically illustrates an example of the circuit of the controlled work that is used for light-emitting diode.According in the example shown in Fig. 1, show first step-down controller 10 here as the basic circuit that is used for led module.In order to make at least one light-emitting diode 7 work, to input direct voltage V of circuit input
1, it also can be the alternating voltage through over commutation naturally.
A switch 5 for example semiconductor power switch especially the series circuit between MOSFET and the idle running diode 2 under the conducting state of switch 5, give inductor 3 energisings by the electric current of the switch 5 of flowing through.Under the cut-off state of switch 5, the energy that is stored in the inductor 3 discharges with the current forms that flows through at least one light-emitting diode 7.
The electric current that flows through at least one light-emitting diode 7 can be measured by corresponding transducer on parallel resistance 6.But this moment disadvantageously, on parallel resistance 6, can only measure electric current in the conducting phase of switch 5.In the idle running stage, electric current flows through idle running diode 2, at least one light-emitting diode 7 and inductor 3, but can't detect for the transducer that is connected on the parallel resistance 6.
But in order to keep certain waveform is led current certain mean value in time, also need be about the information at the electric current change curve of idle running in the time.
The feasible program that can realize is to be provided with another current sensor, whereby the electric current in the energy measurement idle running stage.But the shortcoming of this moment is complicated circuit and the transducer and the associated source of trouble.
Another possibility is, so arranges circuit element, that is, not only can detect electric current in conducting state, and also can detect electric current at the idle running state.But sort circuit is very complicated.
Summary of the invention
Therefore, task of the present invention provides a kind of function circuit of at least one light-emitting diode and method that is used to operate at least one light-emitting diode of being used for, and it realizes that by plain mode diode current keeps stable, and then realizes that diode power keeps stable.
According to the present invention, this task is finished by the feature of independent claims.Dependent claims improves center of the present invention conception in particularly advantageous mode.
The present invention relates to a kind of function circuit that is used at least one light-emitting diode, this function circuit comprises switching regulator circuit and current sensor, this switching regulator circuit is accepted direct voltage and is provided supply power voltage by the switch that timeticks is provided by control unit at least one light-emitting diode, this current sensor links to each other with control unit to detect the electric current that flows through this at least one light-emitting diode in the stage at switch conduction, and wherein this control unit is according to being determined that by current sensor detected electric current in conducting phase switch is by the end of duration between the conducting subsequently.
The invention still further relates to a kind of method that is used for operating at least one light-emitting diode by switching regulator circuit, this switching regulator circuit is accepted direct voltage and supply power voltage is provided at least one light-emitting diode by the switch that is provided timeticks, this method may further comprise the steps: detect the electric current that flows through this at least one light-emitting diode (LED) in the stage at switch conduction, determine that according to electric current detected in conducting phase switch is by the end of duration between the conducting subsequently.
Advantageously, control unit calculates current value when the switch idle running stage finishes based at least one current value that is gone out by current sensor senses.
Current value and a predetermined rated value when advantageously, control unit finishes the idle running stage that calculates compare.
In addition, advantageously, if the current value when the idle running stage that calculates finishes corresponding to rated value, then control unit does not change switch by the end of duration between the conducting subsequently.
Advantageously, if the current value when the idle running stage that calculates finishes greater than rated value, then control unit increases switch by the end of duration between the conducting subsequently.
On the other hand, advantageously, if the current value when the idle running stage that calculates finishes less than rated value, then control unit increases switch by the end of duration between the conducting subsequently.
Preferably, control unit begins to wait for one section blanking time t from the switch conduction stage
BlkAnd be right after after the blanking time by current sensor measurement first current value.
According to first execution mode regulation, control unit is according to I
A=I
BAnd calculate the current value of idle running stage when finishing, wherein I based on first current value
ACurrent value when finishing for the idle running stage, I
BIt is first current value.
According to second execution mode regulation, second current value when control unit determines that conducting phase finishes, and control unit calculates the current value of idle running stage when finishing based on first and second current values and according to following formula,
Wherein, I
ACurrent value when finishing for the idle running stage, I
BBe first current value, I
DIt is second current value.
Stipulate according to the 3rd execution mode, control unit was waited for the blanking time once more and is right after and detect the 3rd current value after second blanking time after detecting first current value, and the current value when control unit finishes by the first and the 3rd current value and according to the following formula calculating idle running stage
I
A＝2*I
B-I
C，
Wherein, I
ACurrent value when finishing for the idle running stage, I
BBe first current value, I
CIt is the 3rd current value.
According to another execution mode regulation, control unit is determined at switch by the end of duration between the conducting subsequently in response to current sensor increase of detected electric current in conducting phase.
Description of drawings
Now, will in conjunction with the accompanying drawings and to specifying of embodiment further feature of the present invention, advantage and performance be described, wherein:
Fig. 1 represents to be used for the first known step-down controller of light-emitting diode,
Fig. 2 represent to flow through exemplary currents curve of the light-emitting diode (LED) module in the step-down controller,
Fig. 3 represents the function circuit that is used for light-emitting diode according to of the present invention,
Fig. 4 and Fig. 5 represent to flow through current curve details of light-emitting diode (LED) module,
Fig. 6 with flowcharting according to the step that is used for the method for operating light-emitting diodes (leds) module of the present invention,
Fig. 7 represents that another is according to the function circuit that is used for light-emitting diode of the present invention.
Embodiment
Fig. 2 is illustrated in the typical voltage and current curve in the step-down controller, for example under the situation of rectangular voltage.Fig. 2 represents the voltage curve or the current curve of at least one light-emitting diode 7 of process for this reason along the X-axis express time along Y-axis.
By control switch 5 correspondingly, function circuit is supplied to rectangular voltage, that is, and and at elapsed time section t
OnThe conducting phase E of switch 5, function circuit is supplied to certain voltage, and at elapsed time section t
OffThe idle running stage F, this moment, switch 5 ended, voltage source is given circuit supply.
By above-mentioned inductor 3, current curve as shown in Figure 2 appears on described at least one light-emitting diode 7.And at the conducting phase E of switch 5, the electric current of at least one light-emitting diode 7 of flowing through increases, and in idle running stage F subsequently, the electric current that flows through at least one light-emitting diode 7 descends again.But when beginning conducting phase E under the situation of actuating switch 5, the parasitic capacitance by buffer network (Snubber-Netzwerk) or switch 5 produces current peak.After its decay, electric current is because of there being inductor 3 linear increases.After switch 5 ended, the inductor null was by load and diode 2.Duration during the current peak is called as blanking time t
BlkPerhaps blank time t
Blk
In order to obtain to be used for the stable in time mean value of led current, need know the current value when the idle running stage finishes, because determine the duration between the next conducting of ending of switch 5 and switch 5 according to this current value.The idle running electric current does not flow away through parallel resistance, so this electric current can't be detected but because as mentioned above.
The present invention so kept away this problem, that is, be right after and detect electric current and infer the idle running electric current based on the current measurement value in ON time E after switch 5 conductings.
Fig. 3 represents the function circuit 1 that is used to operate at least one light-emitting diode 7 according to of the present invention.At this moment, this circuit is corresponding to as shown in Figure 1 and described first step-down controller 11.According to the present invention, also be provided with a transducer 12 here, it is applicable to that detection passes to a control unit 13 by the electric current of parallel resistance 6 measurements and with this value.Control unit 13 controlling switch 5 and be applicable to according to come by transducer 12 electric current transmitted measured values corresponding definite switch 5 by duration t
OffAnd conduction duration t
OnDetermine by duration t by control unit 13
OffWill be in following explanation in detail.
Fig. 4 is illustrated in the voltage and current curve in the light-emitting diode (LED) module once more.Can infer the electric current I when the idle running stage finishes for first kind
AFeasible pattern be, after the blanking time, in other words through blanking time t
BlkAfterwards, measure first current value I
BIn first feasible pattern, suppose t
BlkCompare t
OnMuch smaller, so the electric current I of after the blanking time, measuring
BElectric current I when the idle running stage finishes no better than
ATherefore, can be by first current value from I
A=I
BIn calculate the current value of idle running stage when finishing.
Current value I when the idle running stage that so calculates finishes
ACompare with a rated value, if I
AGreater than the rated value of expectation, then in next timeticks, prolong by and next conducting between duration t
OffIf current value I
ARated value less than expectation then shortens t in next timeticks
OffIf electric current I
APerhaps the rated value that also equals to expect in predetermined tolerance value then keeps t in next timeticks
OffConstant.
Below electric current I when explanation is used for determining that the idle running stage finishes
ASecond feasible pattern.This mode can be used in blanking time t
BlkRelative conduction duration t
OnCan not ignore and disregard and can't satisfy I by the above approximation of taking
AIn the situation of required precision, perhaps be used in and very accurately determine I
ASituation in.For these situations, second current value I in the time of can also measuring conducting phase E end
DElectric current I when the idle running stage finishes
ACan be calculated as follows subsequently:
This formula is based on following principle, that is, electric current is linear the increase after switch 5 conductings, therefore measures current curve I by twice
BAnd I
D, can extrapolate the electric current I of idle running stage when finishing
A
The especially relative complexization in digital circuit that assesses the cost of above-mentioned second method because not only will carry out division, and is carried out multiplication.
Therefore according to the present invention, propose the third method, it is according to the 3rd current value I
CMeasurement.This is schematically illustrated in Fig. 5.For the method, also to wait for blanking time t
Blk, detect first current value I of blanking time when finishing subsequently
BSubsequently, wait for blanking time t once more
BlkAnd detect the 3rd current value I
CBecause I
CAnd I
BDifference be I
C-I
BBecause of the linearity coil electric current equals I
B-I
APoor, so, can calculate I by following formula
A:
I
A＝I
B-(I
C-I
B)＝2*I
B-I
C
Therefore, also can in digital circuit, calculate the current value I of idle running stage when finishing fairly simplely
A, because the calculating of numeric area is reduced to displacement and subtraction.
Guarantee that by the present invention the electric current of at least one light-emitting diode 7 of flowing through does not drop to zero as far as possible, in other words, the invention particularly relates to continuous transmission means.Therefore, the little electric current of trying one's best of at least one light-emitting diode 7 that occurs flowing through changes curve waveform.
General view has schematically illustrated method of the present invention once more in Fig. 7.
This method begins in step S0, and this moment, the idle running stage F finished.In next step S1, control unit 13 sends the signal that is used for conducting phase and gives switch 5.In next step S2, wait for that the blanking time is blank time t
BlkIn the next step S3 that also may be made of a plurality of substeps, at least one current value is that the current measurement value in the conducting phase goes on record by parallel resistance 6 and transducer 12.
In next step S4, control unit calculates backhaul electric current, i.e. electric current I when the idle running stage finishes according to institute's electric current transmitted value
ACheck that in next step S5 whether the backhaul electric current is corresponding to a predetermined rated value.If corresponding, then in next step S7, do not change t deadline
Off
On the other hand, if in step S5, be defined as the backhaul electric current I
ADo not correspond to rated value, then in next step S6, check the backhaul electric current I
AWhether greater than rated value.If greater than, then in next step S9, prolong next deadline, on the other hand, in next step S8, shorten the deadline of next time.In the case, be the duration between ending of switch 5 and the next conducting deadline.This method ends at step S10.
The calculating of taking in step S4 this moment can be according to one of three kinds of said methods, and this depends on pre-adjustment and the measured value that is write down.
Another control feasible pattern is that assessment is by the increase of current sensor 6,12 detected current values.Current value and current value poor when finishing when at this moment, obtaining conducting phase and begin.Can infer the size of inductor 3 from the increase of this electric current, perhaps also can infer the conducting voltage of light-emitting diode 7.If the conducting voltage of the size of inductor 3 or light-emitting diode 7 is known, then can derive to obtaining the backhaul electric current I
ARequired t deadline
Off
In conducting phase E, increased and calculated required t deadline by the electric current that flows through switch 5
OffBring following advantage, that is, before the first idle running stage F, can pre-determine deadline.
In conducting phase, the electric current that flows through switch 5 is obtained by voltage on the inductor 3 and inductor 3 merchants with ON time on duty.And in deadline, the electric current in the idle running path (through light-emitting diode 7) falls by voltage on the inductor 3 and inductor 3 merchants with deadline on duty and obtains.Because idle running in the stage voltage on the inductor be substantially equal to voltage on the light-emitting diode 7 (difference is produced by the conducting voltage of idle running diode 2), therefore can be by conducting phase E with by the duration of stage F and by measuring t deadline
OffAnd ON time is determined the conducting voltage and the inductor 3 of light-emitting diode 7.
If the conducting voltage of the size of inductor 3 or light-emitting diode 7 is known (for example by function circuit designs), the calculating of then required deadline is simplified.But, also can be during operation on the inductance measuring device 3 or light-emitting diode 7 on voltage.If switch 5 is switched on,, can carries out voltage measurement by tie point between inductor 3 and light-emitting diode 7 and measure voltage on the inductor 3 then according to circuit shown in Figure 3.If these two elements are exchanged, then can measure conducting voltage on the light-emitting diode 7 by plain mode.Such voltage measurement also can be used to Fault Identification.Therefore, for example can infer that light-emitting diode 7 breaks down, perhaps also can infer the fault that causes by mistake in the wiring of light-emitting diode 7 such as short circuit.
When storage is used for current value I
AValue the time, can monitor the current value that is detected in time.Change if find the current value detected, can infer then that light-emitting diode 7 or other components and parts may break down or aging.
For calculate needed deadline of t according to the increase of in conducting phase E, flowing through the electric current of switch 5
Off, also can adopt above-mentioned consideration blanking time t
BlkMethod.
Current value I when the idle running stage F of coming comparison to detect by the inventive method finishes
AUnder the situation of predetermined rated value, can revise or improve determining of inductor 3 or determining of the conducting voltage of light-emitting diode 7 this moment.Therefore, can increase in conjunction with the electric current in the conducting phase and calculate needed duration t
Off, certain current value I when it finishes for acquisition idle running stage F
ABe essential.Current value I when in addition, the idle running stage F that reality can be obtained subsequently finishes
ACompare with predetermined rated value, adjust time t once more
Off
If adopted digital circuit, then can realize the use of memory and the execution of required calculating by plain mode.Such digital circuit advantageously has at least one analogue-to-digital converters and is used to detect current value and magnitude of voltage, also has to be used to handle and calculate the computing unit of analog value and to be used for store measurement values and the memory-register of calculated value.
A favourable layout according to control circuit of the present invention can so design, and, in order to regulate the electric current of the light-emitting diode 7 of flowing through, only measure and analyze the electric current in the conducting phase, and existing voltage detecting only is used to fault clearance that is.Therefore, for example can use a comparator to monitor the voltage of light-emitting diode 7 or the voltage on the inductor 3, can make up a circuit cheaply whereby.
Accurately determine in order to try one's best required handoff parameter such as deadline t
Off, the temperature of monitoring light-emitting diode 7 may be favourable.
Fig. 7 represents that another is according to the function circuit 1 that is used to operate at least one light-emitting diode 7 of the present invention.Here, this circuit is corresponding to a buck-boost converter 110.According to the present invention, here measure and flow through the electric current of switch 5 and send this value to control unit 13 by parallel resistance 6.Control unit 13 controlling switch 5 and be applicable in addition according to the current measurement value that transmits by parallel resistance 6 come corresponding definite switch 5 by duration t
OffWith conduction duration t
OnIn the conducting phase E of switch 5, inductor 3 is by excitation.And crossing over time period t
OffIn the stage F, inductor 3 is by degaussing, wherein flow through light-emitting diode 7 and diode 2 of electric current.
The inventive method can be used to all light-emitting diode operations and use circuit topology, wherein can't directly measure the electric current of the light-emitting diode of flowing through, because light-emitting diode does not have direct ground connection, but is connected on a current potential that can change relative to the earth.Therefore, this method also can be used in the function circuit with current potential separation function, and wherein at conducting phase E, an inductor 3 is by excitation, and subsequently by stage F by degaussing, this moment electric current at least one light-emitting diode 7 of flowing through.Inductor 3 can have secondary coil, and at its energy of output in stage F, the result has reached the current potential centrifugation in the circuit whereby for it.Such circuit for example can be a forward converter.In addition, detect and be evaluated at the electric current (electric current increase) of switch of flowing through in the conducting phase E, and determine that the performance of handoffs of required switch 5 (for example (ends) duration t
Off).
In other words, the method that has such function circuit and be used to operate at least one light-emitting diode, promptly irrelevant with load, for example irrelevant with the quantity of the light-emitting diode of switching on, current curve always remains on a value I
MaxWith a value I
MinBetween, promptly always at same value I
MinUnder＞0 the situation, realize the conducting again of switch 5.The smaller waveform that guarantees by the present invention is I
MinAnd I
MaxPoor (I
Min-I
Max) advantage be, provide the electric current that remains unchanged to light-emitting diode basically, thereby when led current is completely different, do not do well displacement.This is the shortcoming of the circuit of discontinuous work, and in other words, in this circuit, led current reduces to zero, and may is zero by keeping a period of time before the conducting once more at switch.
Claims (23)
1. function circuit that is used at least one light-emitting diode (7), this function circuit comprises switching regulator circuit and current sensor (6,12), this switching regulator circuit is accepted direct voltage and supply power voltage (V is provided for described at least one light-emitting diode (7) by the switch (5) that timeticks is provided by control unit (13)
1), this current sensor (6,12) links to each other with control unit (13) to detect the electric current that flows through described at least one light-emitting diode (7) in the conducting phase (E) of switch (5), and wherein, this control unit (13) basis is by current sensor
(6,12) detected electric current in conducting phase (E) determines that switch (5) is by the end of the duration (t between the conducting subsequently
Off).
2. circuit according to claim 1 (1), wherein, control unit (13) calculates current value (I when the idle running stage of switch (5) (F) finishes according at least one by the detected current value of current sensor (6,12)
A).
3. circuit according to claim 1 and 2 (1), wherein, control unit (13) is in response to being determined that by the increase of current sensor (6,12) detected electric current in conducting phase (E) switch (5) is by the end of the duration (t between the conducting subsequently
Off).
4. circuit according to claim 1 and 2 (1), wherein, control unit (13) calculates current value (I when the idle running stage of switch (5) (F) finishes in response to the increase of the electric current of the detected switch of flowing through (5) in conducting phase (E)
A).
5. according to claim 2 or 4 described circuit (1), wherein, the current value (I when control unit (13) finishes the idle running stage (F) that calculates
A) compare with a predetermined rated value.
6. circuit according to claim 5 (1), wherein, if the current value (I when the idle running stage (F) that calculates finishes
A) corresponding to this rated value, then this control unit does not change switch (5) by the end of the duration (t between the conducting subsequently
Off).
7. according to claim 4 or 5 described circuit (1), wherein, if the current value (I when the idle running stage (F) that calculates finishes
A) greater than this rated value, then this control unit prolongs switch (5) by the end of the duration (t between the conducting subsequently
Off).
8. according to claim 4,5 or 6 described circuit (1), wherein, if the current value (I when the idle running stage (F) that calculates finishes
A) less than this rated value, then control unit shortens switch (5) by the end of the duration (t between the conducting subsequently
Off).
9. according to each described circuit (1) in the claim 2 to 8, wherein, the conducting phase (E) of control unit (13) from switch (5) begins to wait for one section blanking time (t
Blk), and be right after at blanking time (t
Blk) detect the first current value (I by current sensor (6,12) afterwards
B).
10. circuit according to claim 9 (1), wherein, control unit (13) is based on the first current value (I
B) and according to I
A=I
BCurrent value (I when calculating idle running stage (F) finishes
A), I wherein
ACurrent value when finishing for the idle running stage (F), I
BIt is first current value.
11. circuit according to claim 9 (1), wherein, the second current value (I when control unit (13) is determined conducting phase (E) end
D), wherein control unit (13) is based on the first current value (I
B) and the second current value (I
D) and calculate the current value (I of idle running stage (F) when finishing according to following formula
A):
Wherein, I
ACurrent value when finishing for the idle running stage (F), I
BBe first current value, I
DIt is second current value.
12. circuit according to claim 9 (1), wherein, control unit is detecting the first current value (I
B) after (t that waits for the blanking time once more
Blk) and be right after at the second blanking time (t
Blk) back detection the 3rd current value (I
C), wherein, control unit (13) is based on the first current value (I
B) and the 3rd current value (I
C) and calculate the current value (I of idle running stage (F) when finishing according to following formula
A):
I
A＝2*I
B-I
C
Wherein, I
ACurrent value when finishing for the idle running stage (F), I
BBe first current value, I
CIt is the 3rd current value.
13. method of operating at least one light-emitting diode (7) by switching regulator circuit, this switching regulator circuit is accepted direct voltage and supply power voltage is provided for described at least one light-emitting diode (7) by the switch (5) that is provided timeticks, and this method may further comprise the steps:
In the conducting phase (E) of switch (5), detect and flow through described at least one light-emitting diode (7) electric current (LED),
Determine that according to the electric current that in conducting phase (E), is detected switch (5) is by the end of the duration (t between the conducting subsequently
Off).
14. method according to claim 13, wherein, in response to determining that by the increase of current sensor (6,12) detected electric current in conducting phase (E) switch (5) is by the end of the duration (t between the conducting subsequently
Off).
15. method according to claim 14, wherein, the current value (I when control unit (13) comes the idle running stage (F) of compute switch (5) to finish based at least one by the detected current value of current sensor (6,12)
A).
16. method according to claim 15, wherein, the current value (I when control unit (13) finishes the idle running stage (F) that calculates
A) compare with a predetermined rated value.
17. method according to claim 16, wherein, if the current value when the idle running stage (F) that calculates finishes corresponding to this rated value, then this control unit does not change switch (5) by the end of the duration (t between the conducting subsequently
Off).
18. according to claim 13,14 or 15 described methods, wherein, if the current value (I when the idle running stage (F) that calculates finishes
A) greater than this rated value, then this control unit prolongs switch (5) by the end of the duration (t between the conducting subsequently
Off).
19. according to claim 16,17 or 18 described methods, wherein, if the current value (I when the idle running stage (F) that calculates finishes
A) less than this rated value, then this control unit shortens switch (5) by the end of the duration (t between the conducting subsequently
Off).
20. according to each described method in the claim 13 to 19, wherein, the conducting phase (E) of control unit (13) from switch (5) begins to wait for one section blanking time (t
Blk), and be right after at blanking time (t
Blk) detect the first current value (I by current sensor (6,12) afterwards
B).
21. method according to claim 20, wherein, control unit (13) is based on the first current value (I
B) and according to I
A=I
BCurrent value (I when calculating idle running stage (F) finishes
A), I wherein
ACurrent value when finishing for the idle running stage (F), I
BIt is first current value.
22. method according to claim 20, wherein, the second current value (I when control unit (13) is determined conducting phase (E) end
D), and wherein control unit (13) based on the first current value (I
B) and the second current value (I
D) and calculate the current value (I of idle running stage (F) when finishing according to following formula
A):
Wherein, I
ACurrent value when finishing for the idle running stage (F), I
BBe first current value, I
DIt is second current value.
23. method according to claim 20 wherein, is detecting the first current value (I
B) after (t that waits for the blanking time once more
Blk), and be right after at the second blanking time (t
Blk) back detection the 3rd current value (I
C), and wherein, control unit (13) is based on the first current value (I
B) and the 3rd current value (I
C) and calculate the current value (I of idle running stage (F) when finishing according to following formula
A):
I
A＝2*I
B-I
C
Wherein, I
ACurrent value when finishing for the idle running stage (F), I
BBe first current value, I
CIt is the 3rd current value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007049533.3 | 2007-10-16 | ||
| 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 (1)
| Publication Number | Publication Date |
|---|---|
| CN101828428A true CN101828428A (en) | 2010-09-08 |
Family
ID=40458730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880112068A Pending CN101828428A (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 (3)
| 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 |
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 EP EP08840612.9A patent/EP2201821B1/en active Active
- 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 AT ATA9322/2008A patent/AT516957B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009049876A3 (en) | 2009-07-23 |
| WO2009049876A9 (en) | 2009-06-11 |
| AT516957B1 (en) | 2016-10-15 |
| DE102007049533B4 (en) | 2017-02-23 |
| DE102007049533A1 (en) | 2009-04-23 |
| AT516957A5 (en) | 2016-10-15 |
| WO2009049876A2 (en) | 2009-04-23 |
| EP2201821A2 (en) | 2010-06-30 |
| EP2201821B1 (en) | 2017-09-13 |
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Application publication date: 20100908 |