CN102598857B - Phase cut dimming of LEDs - Google Patents
Phase cut dimming of LEDs Download PDFInfo
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- CN102598857B CN102598857B CN201080045801.XA CN201080045801A CN102598857B CN 102598857 B CN102598857 B CN 102598857B CN 201080045801 A CN201080045801 A CN 201080045801A CN 102598857 B CN102598857 B CN 102598857B
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- 230000004913 activation Effects 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000002457 bidirectional effect Effects 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 5
- 230000009916 joint effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 230000000740 bleeding effect Effects 0.000 abstract 4
- 230000002123 temporal effect Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 5
- 230000003213 activating effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
- H05B45/357—Driver circuits specially adapted for retrofit LED light sources
- H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
- H05B45/3575—Emulating the electrical or functional characteristics of incandescent lamps by means of dummy loads or bleeder circuits, e.g. for dimmers
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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]
-
- 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
-
- 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]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention relates to a dimmable LED module, the module being designed for being dimmed using a dimmer controlling a phase cut of an AC supply voltage supplied to the LED module, the module comprising: - a bleeding circuit for selectively acting to draw a bleeding current in periods when the supply voltage amplitude is below a threshold value, - a control circuit being supplied with a signal indicating the activity of the bleeding circuit, the control circuit determining, based on the bleeding activity indication signal, a value representing the phase cut present in the AC supply voltage and issuing a control signal as a function of the phase cut value, and - at least one driver circuit being supplied with said control signal and adjusting the power supplied associated LED lighting means.
Description
Technical field
The present invention relates in general to and uses phase-cut dimming to the field of LED light device light modulation.
Background technology
In order to save energy, usually use electricity-saving lamp now.Along with introducing efficient LED (LED) is as potential light source, also create using the demand with the electricity-saving lamp of the LED of dimming capability.Such system must provide the function of dimming interface, especially for use phase dimmer.Normally used dimmer has several types.Those adopt the dimmer operation of bidirectional thyristor device or triode thyristor device closely similar.These two kinds of thyristor units are all as speed-sensitive switch and for controlling the amount of the electric energy being delivered to lamp in dimmer.They realize this point by the mains voltage waveform that " blocking " is sinusoidal.When trigger impulse or starting impulse indicating device start conduction.Device is activated more late, and its more late beginning is conducted electricity, and therefore transmits less electric power to load.
Proposed multiple circuit arrangement, described multiple circuit arrangement should add dimming function to LED-based light source.
An example is EP 1016062B1, wherein by number bus control LED, such as, can pass through digital multiplex (DMX).
Subject matter is that general bidirectional thyristor dimmer is when using and the compatibility of LED driver circuit and provide dim signal according to the control of phase dimmer.Therefore emphasis of the present invention is to provide the Method and circuits solving this problem.
WO 2009/121956A1 teaches a kind of constant-current source, and this constant-current source is selectively activated lower than during given threshold value at the amplitude of alternating supply voltage, so activates dummy load during this period.This method is called " releasing ", and when input ac voltage level is lower than given threshold voltage, activates dummy load and be called " leadage circuit " with the circuit of drawing extracurrent from constant-current source.
Summary of the invention
The invention provides a kind of improvement project, according to the cut of the alternating supply voltage of operating means operation to LED light modulation, described operating means is used for one or more LED, OLED or the suitable lighting device of other electrical characteristics.
This object is realized by the feature of independent claims.Dependent claims has further developed central idea of the present invention.
A first aspect of the present invention relates to a kind of LED module of tunable optical,
This module is designed to utilize dimmer modulated light, and described dimmer controls the cut being supplied to the alternating supply voltage of described LED module, and this module comprises:
-leadage circuit, described leadage circuit is used for selectivity during described supply power voltage amplitude is lower than threshold value and works to draw leakage current,
-control circuit, described control circuit can be supplied with the signal of the activation indicating described leadage circuit, described control circuit according to described in release and activate index signal and determine to represent the value of the cut occurred in described alternating supply voltage, and send control signal according to cut value, and
At least one drive circuit, described drive circuit is supplied with described control signal, and adjustment supplies the electric power of relevant LED light device.
Another aspect of the present invention relates to a kind of LED module of tunable optical,
This module is designed to utilize dimmer modulated light, and described dimmer controls the cut being supplied to the alternating supply voltage of described LED module, and this module comprises:
-leadage circuit, described leadage circuit is used for optionally working to draw leakage current according to the cut occurred in described alternating supply voltage,
-control circuit, described control circuit is supplied with the signal of the activation indicating described leadage circuit, described control circuit according to described in release and activate index signal and determine to represent the value of the cut occurred in described alternating supply voltage, and send control signal according to cut value, and
At least one drive circuit, described drive circuit is supplied with described control signal, and adjustment supplies the electric power of relevant LED light device.
Described releasing activates one that index signal can directly or indirectly indicate in the leakage current of the resistance device striding across described leadage circuit or voltage, and such as described resistance device is the resistance device of the joint effect of the activation of measuring described supply power voltage and described leadage circuit.
Described leadage circuit can be the circuit separated with described control circuit, or the circuit of the integration section of described control circuit.
Described activation index signal of releasing can be pulse signal.
Described control circuit is released and is activated the pulse duration of index signal described in can determining.
Described leakage current can be constant, change or by pulse regulation, control especially by active pulse width modulation (PWM).
Or can be not all mains voltage cycle termly in each cycle of supply voltage, activation index signal of releasing described in generation.
Described leadage circuit can comprise current source, and is activated passively, or described leadage circuit comprises the temporal logic of the switch controlling described leadage circuit on one's own initiative.
Described control circuit can be designed to the timing obtaining the timing of the zero crossing of described alternating supply voltage and arbitrary cut of described alternating supply voltage according to described leadage circuit index signal.
On the other hand relate to a kind of LED module, wherein, LED module comprises leadage circuit and drive circuit, and described drive circuit controls the electric power of LED light device by the one or more modes in following:
-low frequency PWM controls, and pwm pulse has the frequency of the twice level of the frequency of described alternating supply voltage, preferably has the frequency between 90Hz and 140Hz, with described, described pwm pulse preferably releases that to activate index signal synchronous,
-high-frequency PWM controls, and the frequency of pwm pulse is greater than 200Hz, is preferably more than 500Hz, and/or
-flow through the control of the amplitude of the direct current of described LED light device.
Can by the spacer assembly of such as optical coupler, isolating described LED light device for electric potential and described supply power voltage, wherein, described control circuit can connect the primary side of described spacer assembly or the current potential of primary side.
The invention still further relates to a kind of LED of improvement, comprise LED module as above.
Another aspect of the present invention relates to a kind of method of the LED module for operating tunable optical, described module uses dimmer modulated light, described dimmer controls the phase place being supplied to the alternating supply voltage of described LED module, described dimmer such as having the dimmer of bidirectional thyristor, wherein:
The leadage circuit of-described LED module optionally works to draw leakage current during described supply power voltage amplitude is lower than threshold value,
-control circuit, described control circuit is supplied with the signal of the activation indicating described leadage circuit, and sends control signal according to described activation index signal of releasing, and
At least one drive circuit, described drive circuit is supplied with described control signal, and adjustment supplies the electric power of relevant LED light device.
Described releasing activates one that index signal directly or indirectly indicates in the leakage current of the resistance device striding across described leadage circuit or voltage, such as, measure the resistance device of the joint effect of the activation of described supply power voltage and described leadage circuit.
Describedly release that to activate index signal be pulse signal, described control circuit determine described in release and activate the pulse duration of index signal.
Described control circuit according to the estimated value of described pulse duration, can determine the time of the zero crossing of described alternating supply voltage.
The measurement of arbitrary cut angle that described control circuit can occur in supply power voltage according to the Timing Synchronization of described zero crossing.
Described leakage current can be constant, change or by pulse regulation, control the switch of described leadage circuit especially by active PWM.
Can at the mains voltage cycle of each cycle of supply voltage or i.e. not all termly, activation index signal of releasing described in generation.
Described leadage circuit can be activated passively, or described leadage circuit is such as controlled on one's own initiative by switch.
Accompanying drawing explanation
From the detailed description of following the preferred embodiment of the present invention by reference to the accompanying drawings, other features of the present invention, advantage and object will become obvious.
Fig. 1 illustrates the first execution mode of the dimmable ballast for LED light device;
Fig. 2 illustrates the first execution mode of the dimmable ballast for LED light device;
Fig. 3 is shown specifically the first execution mode of leadage circuit of the present invention;
Fig. 4 is shown specifically the second execution mode of the present invention;
Fig. 5 illustrates the output signal of leading edge dimmer and corresponding R
shuntleakage current detection signal; And
Fig. 6 is shown specifically the 3rd execution mode of the present invention.
Embodiment
First execution mode of the dimmable ballast being used for LED light device is described now with reference to Fig. 1.Propose to control (management) for the primary side of LED electrical power according to this first execution mode.
Note, " primary side " and " primary side " relates separately to primary side and the primary side of spacer assembly, and the current potential of described LED light device is separated with supply power voltage by this spacer assembly, will explain in detail later.
Can see from Fig. 1, alternating supply voltage 1 supplied by the input filter 2 to ballast, and this alternating supply voltage 1 is such as that frequency is 50Hz or 60Hz and effective voltage is the AC supply voltage of 120V or 230V.
As schematically shown in figure 1, such as, by the manually operated dimmer of user, this alternating supply voltage can be carried out cut, this dimmer comprises bidirectional thyristor for cut or triode thyristor.The duration of cut represents dimmer command.
Then, the output signal i.e. filtered alternating supply voltage of this input filter 2 is supplied to the first rectifier 3 and the second rectifier 4.
There is provided this first rectifier 3, with to this LED light device 5 transferring electric power.
There is provided this second rectifier 4, to supply leadage circuit 6 and adjusting control circuit 7.
Note, also may only provide a rectifier for LED light device 5 transferring electric power and for this leadage circuit 6.
Leadage circuit according to the present invention has following one or more function, preferably has following repertoire:
I. at the input of Alternating Current Power Supply (such as) power supply as load, prevent the supply power voltage leakage current (gas coming through discharge lamp etc.) when driver is closed from increasing the input voltage of drive circuit and causing triggering again and optical flare.
Ii. input voltage can be made to follow the cut of supply power voltage more accurately by bidirectional thyristor.Because average commutating voltage or bus voltage are generally used for control system, this is very important for being avoided error.When leadage circuit un-activation, voltage can drift about, when being especially attended by the leakage current flowing through dimmer or switch.
Iii. support that bidirectional thyristor keeps electric current at switching point.
Iv. the input radio frequency of dimmer internal and dimmer and transducer is suppressed to disturb oscillation behavior between (RFI) filter.
V. the dimming information detected from leading edge dimmer and trailing edge dimmer is supported.
The output of this first rectifier 3, namely after filtering and the alternating supply voltage of rectification, can selectivity be supplied to:
-fill out paddy circuit 8 (such as active fill out paddy circuit, the passive active-passive filling out paddy circuit or combination fills out paddy circuit),
-active power switched factor correcting (PFC) circuit 9 (wherein, the switching of pfc circuit is controlled by the control circuit receiving at least one input signal), or
-filter circuit 10, this filter circuit 10 comprises such as electrolytic capacitor.
The rectification of such process and filtered supply power voltage is then supplied to LED driver 11, this LED driver 11 has DC-DC (DC/DC) transducer, this DC-DC (DC/DC) transducer is such as flyback converter 12, especially quasi-resonance flyback converter.Note, DC/DC transducer that is that other is isolated or non-isolated can be used.Isolation also can outside this DC/DC transducer.LED module due to tunable optical can comprise the step-down controller of non-isolated as DC/DC transducer, and therefore the LED module of tunable optical also can not be isolated.
This LED driver 11 supplies (FEEDBACK CONTROL) electric power regulated to LED light device 5.
As Fig. 1 schematically shows, the LED (or OLED, or the suitable lighting device of other electrical characteristics) that this LED light device 5 can be connected and/or be connected in parallel for multiple.
The feedback signal 13 that instruction such as flows through the electric current of this LED light device is fed back to this LED driver 11.In the example shown, this LED driver is flyback converter 12, has primary side switch 14.By adjusting the clock of this switch 14, the electric power being supplied to this LED light device can be controlled, when the measured value of this feedback signal 13 is not equal to rated value, to control it close to rated value.
Can this LED be set by calibration and use open-loop method to run LED.According to the phase dimmer signal from described leadage circuit, by changing the amplitude of LED current or changing the electric power being supplied to this LED light device by means of only pulse operation.
In general, this DC/DC transducer has at least one for changing the control inputs of the electric power being supplied to this LED light device 5.
The current potential of this LED light device 5 can with alternating supply voltage 1 potential isolation.In the example shown, the transformer 15 actually by AC/DC transducer 12 realizes this isolation.
Such as carry out Current Control by the switch 14 of DC/DC transducer 12, this Current Control is controlled by the output signal 6 of adjusting control circuit 7.Therefore, this adjusting control circuit 7 provides rated value by the electric power that signal 16 is this LED light device.
In fact control circuit 17 according to the feedback signal 13 measured and control (rated value) signal 16 of this adjusting control circuit 7, drives the switch 14 of such as LED driver 11.
As schematically shown by Reference numeral 18, such as by optical coupler 18 by the potential isolation of this adjusting control circuit 7 with LED light device 5, and in this example, this adjusting control circuit 7 with exchange supply voltage 1 isolating.Due to can not the potential isolation of this adjusting control circuit 7 and LED light device 5, this adjusting control circuit 7 can also be directly connected to primary side, such as this LED driver 11.
Because the electric power (electric current) carrying out this LED light device 5 in the primary side of spacer assembly 15 controls, therefore the execution mode of Fig. 1 is called that primary side regulates.
The Alternate embodiments of Fig. 2 realizes the concept of primary side adjustment.Again, alternating supply voltage is supplied to input filter 2, then supplies the second rectifier 4 and pulse rectifier 3.In the present embodiment, the output of the first rectifier 3 is similarly directly supplied to LED driver 11.Preferably, this LED driver 11 also has spacer assembly 15, and example is transformer as shown.
Similarly send the output of the second rectifier 4 to leadage circuit 6 and adjusting control circuit/interface 7.To understand, term " interface " is actual refers to the dim signal that this circuit can receive the outside from bus, wireless mode (such as infrared ray (IR)) etc., and Reference numeral 19 is schematically appointed as in outside input.This is obviously also applicable to the execution mode of Fig. 1.
In the execution mode of Fig. 2, owing to carrying out primary side adjustment, this adjusting control circuit/interface 7 such as by driving the switch 14 in the primary side of this transducer 11, controls this LED driver 11.
Regulate (Fig. 2) or primary side to regulate (Fig. 1) for primary side, different choice can be utilized to regulate the electric power of this LED light device 5.
First example regulates the DC level flowing through the electric current of this LED light device 5.
Second selects to be that high-frequency impulse width modulated (PWM) controls, and wherein, " high frequency " will be interpreted as that the current impulse flowing through this LED light device 5 of generation has the frequency higher than the frequency of the AC-input voltage of rectification.Therefore, when ac power supply voltage, high-frequency PWM pulse is greater than the frequency of 120Hz by having.
3rd selection is that the PWM of the electric power that this LED light device 5 consumes controls, and wherein, " low frequency " will be interpreted as that the low frequency pwm pulse of the electric current flowing through LED 5 has the frequency of the supply power voltage rank of rectification, such as 100Hz or 120Hz.
Fig. 3 is shown specifically the preferred implementation of the leadage circuit 6 supplied by filtered alternating supply voltage, before being fed to this leadage circuit 6, carries out rectification (diode bridge 3) to this filtered alternating supply voltage.
According to the present embodiment, this leadage circuit 6 has constant-current source, and this constant-current source comprises transistor T2, and this constant-current source is by the voltage control of the base-emitter of T2.
Temporal logic unit 21 is as output, and preferably by digital signal, this output can make transistor T1 conducting flow through the first resistance R to activate
series, transistor T1 (during conducting) and measure shunt R
shuntleakage current.
Can by the voltage V of the base-emitter of transistor seconds T2
bEcontrol the amplitude of this leakage current, such as, to control in the scope of 10-50mA, preferably within the scope of 20-30mA.
This temporal logic unit can be such as microcontroller, application-specific integrated circuit (ASIC) (ASIC) or its combination.
This temporal logic unit 21 detects at the input pin of this temporal logic unit 21 leakage current produced.
Typically, lower and during such as there is the amplitude lower than 30Vpk (crest voltage) at this input voltage (supply power voltage), this this leakage current of temporal logic unit activating.Therefore, this temporal logic unit once synchronous with alternating supply voltage, then enabled this leadage circuit, is then detected the activation of the leadage circuit enabled in these low-voltage time periods (near zero crossing).
Therefore, by near the zero crossing of this alternating supply voltage, at R
shuntupper detection current impulse, in addition, when bidirectional thyristor conducting in manually operated dimmer, passes through R by the output at this temporal logic unit
shuntdetect different leakage current pulses.During the cut of this alternating supply voltage, the amplitude of this supply power voltage by step-down, and only flows through R
shuntelectric current be quiescent current, this quiescent current needs to supply the electronic device of (maintenance) dimmer, the electronic device in the manually operated dimmer namely outside LED illumination ballast.
Noting, in the example shown, detecting by measuring leakage current activation of releasing, especially by timing and/or the width of measuring leakage current pulse.This width is as the criterion of pulse with different reason.
But, alternatively or even additionally, the activation of this leadage circuit also can be detected on power voltage line.Hereinafter such example is described a modification according to Fig. 6.
Fig. 4 illustrates another the possible operation instruction according to leadage circuit 6 ' of the present invention.
According to the present embodiment, temporal logic unit 21 ' activates leakage current, and output pwm signal, by RC filter circuit (C1, R2) filtering is carried out to this pwm signal, enter conducting state to control such as mos field effect transistor (MOSFET) switch M1.
Similarly, measurement shunt R is utilized
shuntmeasure the leakage current produced, and this leakage current is supplied to the input pin of this temporal logic unit 21 '.
Fig. 5 illustrates the output signal (top component) of trailing edge dimmer and corresponding at shunt R
shuntpulse current detect diagram.
By observing pulse duration or pulse timing with the operating frequency of the timing He this alternating supply voltage that calculate the zero crossing of this alternating supply voltage, can by the forward position in LED ballast or after separate along detection algorithm, from the timing of current impulse acquisition of information cut.The position of narrower current impulse instruction cut.Can be detected wide current impulse (leakage current) and narrow current impulse (in dimmer by cut technology that bidirectional thyristor or triode thyristor carry out) respectively by temporal logic unit 21,21 '.
Therefore, the current information from leadage circuit 6,6 ' can be utilized to detect the cut timing of dimmer.Therefore, the cut detected can be used as dimmer control information, and can carry out " conversion " (above seeing: change the DC electric current, high-frequency PWM or the low frequency PWM that flow through this LED light device) by different modes.
In the simplest mode, the low frequency PWM of such as this LED light device 5 controls, DC/DC transducer 11 out of service during cut being detected.
After enforcement along detection algorithm, Problems existing is: when dimmer turns off its MOSFET or equivalent, and the underloading on usual dimmer follows cut information to make it export, therefore, if voltage is not reduced to lower than 30Vpk, leakage current pulse there will not be.In order to accurate detected phase timing information, active or adaptive method activation leakage current can be used.An example is, sustained activation leakage current within one or several cycle of alternating supply voltage, can pass through to measure shunt R
shuntvoltage (when dimmer switch disconnects) or by the power supply input voltage signal that can detect at the output of bridge rectifier 3 detect timing.Be enough to leadage circuit 6 when dimmer is changed but is low to moderate, when the consumption of 6 ' inside remains in acceptable degree, the repetition rate that leakage current activates should be enough to fast detecting.
According to optional execution mode, high-frequency PWM signal can be applied to switch of releasing (Fig. 4) to limit power consumption.This can be tracked to detect cut position during voltage time section.
According to another Alternate embodiments, leadage circuit can be activated at the one-period of alternating supply voltage, and average voltage can be utilized to predict dimmer information.Such as, can carry out once to limit the power consumption in leadage circuit in every 10 cycles.
Fig. 6 illustrates according to leadage circuit 6 of the present invention " another possible execution mode.
According to this execution mode, transistor Q5 detects power level by divider resistance R32, R33 and R34.This transistor regulates transistor Q4, and this transistor Q4 has dual role as current source, for supporting bidirectional thyristor to keep electric current and releasing activation for expression of signaling for leadage circuit.In the Q4 conducting of this transistor and therefore " when activating, the voltage of transistor Q4 is drop-down, and this can be used as signal (the digital V of the activation of this leadage circuit of instruction for leadage circuit 6
out).Disconnect at transistor Q4, and therefore this leadage circuit 6 " in unactivated situation, resistance R40 is by the voltage high of described transistor Q4, and this can be used as the unactivated signal of this leadage circuit of instruction (digital V
out).As mentioned above, during the amplitude of supply power voltage is lower than threshold value, " selectivity works to draw leakage current this leadage circuit 6.This leadage circuit 6 " depends on the cut occurred in alternating supply voltage.
The unactivated signal of leadage circuit (digital V is indicated in this example
out) be a kind of digital signal, only need detection signal high or low.Such advantage is, compares similar detection, and this signal is not easily affected by noise, and noise or interference here can cause there is error in the signal received.
Leadage circuit 6,6 ', 6 " activation also can depend on the electric current exported from the output of the first rectifier 3, namely flow to the electric current of filter circuit 10.Only when the electric current entering filter circuit 10 (or active switching pfc circuit 9 or fill out paddy circuit 8) is lower than given threshold value, just activate leakage current.
But, alternatively or even additionally, also can detect leadage circuit 6 on power voltage line " activation.Activation can be detected on divider resistance R32, R33 and R34, the base terminal of transistor Q5 detects power level.
Claims (30)
1. a LED module for tunable optical,
Described module is designed to utilize dimmer modulated light, and described dimmer controls the cut being supplied to the alternating supply voltage of described LED module, and described module comprises:
-leadage circuit, described leadage circuit is used for working to draw leakage current during described supply power voltage amplitude is lower than threshold value,
-control circuit, described control circuit is supplied the signal of the activation indicating described leadage circuit, described control circuit determines according to the signal of the activation of the described leadage circuit of described instruction the value representing the cut occurred in described alternating supply voltage, and sends control signal according to cut value, and
-at least one drive circuit, described drive circuit is supplied described control signal, and adjustment supplies the electric power of relevant LED light device.
2. LED module as claimed in claim 1,
Wherein, the signal of the activation of the described leadage circuit of described instruction directly or indirectly indicates in the leakage current of the resistance device striding across described leadage circuit or voltage.
3. LED module as claimed in claim 2, wherein, described resistance device is the resistance device of the joint effect of the activation of measuring described supply power voltage and described leadage circuit.
4. the LED module as described in aforementioned any one claim,
Wherein, described leadage circuit is the circuit separated with described control circuit, or the circuit of the integration section of described control circuit.
5. LED module as claimed in claim 1,
Wherein, the signal of the activation of the described leadage circuit of described instruction is pulse signal.
6. LED module as claimed in claim 5,
Wherein, the pulse duration of the signal of the activation of the described leadage circuit of described instruction determined by described control circuit.
7. LED module as claimed in claim 1,
Wherein, described leakage current is constant, change or by pulse regulation.
8. LED module as claimed in claim 7, wherein, described leakage current is controlled by active pulse width modulation (PWM).
9. LED module as claimed in claim 1,
Wherein, at each cycle of supply voltage or the mains voltage cycle of i.e. not all termly, the signal of the activation of the described leadage circuit of described instruction is produced.
10. LED module as claimed in claim 1,
Wherein, described leadage circuit comprises current source and is activated passively, or described leadage circuit comprises the timing logic of the switch controlling described leadage circuit on one's own initiative.
11. LED modules as claimed in claim 1,
Wherein, described control circuit is designed to based on the activation of the described leadage circuit of described instruction the timing of zero crossing of alternating supply voltage and the timing of arbitrary cut of described alternating supply voltage described in signal acquisition.
12. LED modules as claimed in claim 1,
Wherein, described drive circuit controls the electric power of LED light device by the one or more modes in following manner:
-low frequency PWM controls, and pwm pulse has the frequency of the twice magnitude of the frequency of described alternating supply voltage;
-high-frequency PWM controls, and pwm pulse has and is greater than 200Hz, and/or
-flow through the control of the amplitude of the direct current of described LED light device.
13. LED modules as claimed in claim 12, wherein, the described pwm pulse in described low frequency PWM controls has the frequency between 90Hz and 140Hz.
14. LED modules as claimed in claim 12, wherein, the described pwm pulse in described low frequency PWM controls is synchronous with the signal of the activation of the described leadage circuit of described instruction.
15. LED modules as claimed in claim 12, wherein, the described pwm pulse in described high-frequency PWM controls has the frequency being greater than 500Hz.
16. LED modules as claimed in claim 1,
Wherein, by spacer assembly, isolating described LED light device for electric potential and described supply power voltage, wherein said control circuit is connected to the primary side of described spacer assembly or the current potential of primary side.
17. LED modules as claimed in claim 16, wherein, described spacer assembly is optical coupler.
18. 1 kinds of LED improved, comprise the LED module described in aforementioned any one claim.
19. 1 kinds for operating the method for the LED module of tunable optical, described module uses dimmer modulated light, and described dimmer controls the phase place being supplied to the alternating supply voltage of described LED module, wherein:
The leadage circuit of-described LED module works to draw leakage current during described supply power voltage amplitude is lower than threshold value,
-control circuit is supplied the signal of the activation indicating described leadage circuit, and sends control signal according to the signal of the activation of the described leadage circuit of described instruction, and
-at least one drive circuit is supplied described control signal, and adjustment supplies the electric power of relevant LED light device.
20. methods as claimed in claim 19, wherein, described dimmer is the dimmer with bidirectional thyristor.
21. methods as claimed in claim 19,
Wherein, the signal of the activation of the described leadage circuit of described instruction directly or indirectly indicates in the leakage current of the resistance device striding across described leadage circuit or voltage.
22. methods as claimed in claim 21, wherein, described resistance device is the resistance device of the joint effect of the activation of measuring described supply power voltage and described leadage circuit.
23. methods as described in claim 19 or 20,
Wherein, the signal of the activation of the described leadage circuit of described instruction is pulse signal, and the pulse duration of the signal of the activation of the described leadage circuit of described instruction determined by described control circuit.
24. methods as claimed in claim 23,
Wherein, described control circuit, according to the estimated value of described pulse duration, determines the timing of the zero crossing of described alternating supply voltage.
25. methods as claimed in claim 24,
Wherein, described control circuit makes the measurement of the arbitrary cut angle occurred in described supply power voltage synchronous according to the timing of described zero crossing.
26. methods as claimed in claim 19,
Wherein, described leakage current is constant, change or by pulse regulation.
27. methods as claimed in claim 26, wherein, control the switch of described leadage circuit by active PWM.
28. methods as claimed in claim 19,
Wherein, at each cycle of supply voltage or the mains voltage cycle of i.e. not all termly, the signal of the activation of the described leadage circuit of described instruction is produced.
29. methods as claimed in claim 19,
Wherein, described leadage circuit is activated passively, or described leadage circuit controls on one's own initiative.
30. methods as claimed in claim 29, wherein, described leadage circuit is controlled on one's own initiative by switch.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT639/2009 | 2009-10-14 | ||
| AT6392009 | 2009-10-14 | ||
| PCT/EP2010/065412 WO2011045372A1 (en) | 2009-10-14 | 2010-10-14 | Phase cut dimming of leds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102598857A CN102598857A (en) | 2012-07-18 |
| CN102598857B true CN102598857B (en) | 2015-05-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080045801.XA Expired - Fee Related CN102598857B (en) | 2009-10-14 | 2010-10-14 | Phase cut dimming of LEDs |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2489242A1 (en) |
| CN (1) | CN102598857B (en) |
| WO (1) | WO2011045372A1 (en) |
Families Citing this family (15)
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|---|---|---|---|---|
| US8674605B2 (en) * | 2011-05-12 | 2014-03-18 | Osram Sylvania Inc. | Driver circuit for reduced form factor solid state light source lamp |
| DE102012206349A1 (en) | 2011-12-23 | 2013-06-27 | Tridonic Gmbh & Co Kg | Method and circuit arrangement for operating bulbs with load jump |
| CN104041184B (en) * | 2012-01-06 | 2017-06-23 | 飞利浦照明控股有限公司 | For compensating the load particularly electrical equipment and method of the influence of the electric current of LED unit and the actuator device for load particularly LED unit |
| CN104206010A (en) * | 2012-01-20 | 2014-12-10 | 欧司朗有限公司 | Optoelectronic component device |
| CN104094668B (en) | 2012-02-02 | 2016-05-04 | 皇家飞利浦有限公司 | Led light source |
| CN103260286B (en) * | 2012-02-15 | 2016-08-17 | 通嘉科技股份有限公司 | There is drive system and the light adjusting controller of dimming function |
| JP2014022240A (en) * | 2012-07-20 | 2014-02-03 | Toshiba Lighting & Technology Corp | Sign device and sign system |
| US9392654B2 (en) * | 2012-08-31 | 2016-07-12 | Marvell World Trade Ltd. | Method and apparatus for controlling a power adjustment to a lighting device |
| US9089012B2 (en) | 2013-05-24 | 2015-07-21 | Terralux, Inc. | Secondary-side sensing of phase-dimming signal |
| US9497818B2 (en) | 2013-06-05 | 2016-11-15 | Koninklijke Philips N.V. | Apparatus for controlling light module |
| US9277611B2 (en) | 2014-03-17 | 2016-03-01 | Terralux, Inc. | LED driver with high dimming compatibility without the use of bleeders |
| JP6278314B2 (en) * | 2014-04-18 | 2018-02-14 | パナソニックＩｐマネジメント株式会社 | Lighting device and lighting apparatus using the same |
| EP3000166A4 (en) * | 2014-08-19 | 2016-10-05 | Abbeydorney Holdings Ltd | Driving circuit, lighting device and method of reducing power dissipation |
| CN109392216B (en) * | 2018-03-22 | 2024-03-08 | 陕西亚成微电子股份有限公司 | Method for self-adjusting discharge current and LED silicon controlled rectifier dimming circuit |
| US11206727B1 (en) | 2020-06-23 | 2021-12-21 | Cypress Semiconductor Corporation | Pseudo-digital light emitting diode (LED) dimming with secondary-side controller |
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- 2010-10-14 EP EP10766043A patent/EP2489242A1/en not_active Ceased
- 2010-10-14 WO PCT/EP2010/065412 patent/WO2011045372A1/en active Application Filing
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| EP1016062B1 (en) * | 1997-08-26 | 2002-08-07 | Color Kinetics Incorporated | Multicolored led lighting method and apparatus |
| CN1843061A (en) * | 2004-05-19 | 2006-10-04 | 高肯集团有限公司 | Dimming circuit for LED lighting device and means for holding TRIAC in conduction |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102598857A (en) | 2012-07-18 |
| WO2011045372A1 (en) | 2011-04-21 |
| EP2489242A1 (en) | 2012-08-22 |
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