CN102598857A - Phase cut dimming of LEDs - Google Patents
Phase cut dimming of LEDs Download PDFInfo
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- CN102598857A CN102598857A CN201080045801XA CN201080045801A CN102598857A CN 102598857 A CN102598857 A CN 102598857A CN 201080045801X A CN201080045801X A CN 201080045801XA CN 201080045801 A CN201080045801 A CN 201080045801A CN 102598857 A CN102598857 A CN 102598857A
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- 230000004913 activation Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 13
- 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 8
- 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
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000740 bleeding effect Effects 0.000 abstract 4
- 230000002123 temporal effect Effects 0.000 description 11
- 238000002955 isolation Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001914 filtration Methods 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
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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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
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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]
- 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 the field of phase-cut dimming to the light modulation of LED lighting device of using.
Background technology
In order to save energy, use electricity-saving lamp now usually.Along with introducing efficient LED (LED), also produced the demand of electricity-saving lamp that use is had the LED of dimming capability as potential light source.Such system must provide the function of dimming interface, especially for using 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 all are used to control the amount of the electric energy that is delivered to lamp as speed-sensitive switch and in dimmer.They realize this point through " blocking " sinusoidal mains voltage waveform.When trigger impulse or starting impulse indicating device begin conduction.Device is activated more lately, and it begins conduction more evening, therefore transmits less electric power and gives load.
Proposed multiple circuit arrangement, said multiple circuit arrangement should add dimming function to LED-based light source.
An example is EP 1016062B1, wherein can be through number bus control LED, for example through digital multiplex (DMX).
Subject matter is that general bidirectional thyristor dimmer provides dim signal with the compatibility of led driver circuit and according to the control of phase dimmer when using.Therefore emphasis of the present invention provides the Method and circuits that addresses this problem.
WO 2009/121956A1 has instructed a kind of constant-current source, and this constant-current source is optionally activated when the amplitude of alternating supply voltage is lower than given threshold value, so activates dummy load during this period.This method is called " releasing ", and when the 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 present invention provides a kind of improvement project, and to the LED light modulation, said operating means is used for one or more LED, OLED or the suitable lighting device of other electrical characteristics according to the cut operation of the alternating supply voltage of operating means.
This purpose realizes through the characteristic of independent claims.Dependent claims has further developed central idea of the present invention.
First aspect of the present invention relates to a kind of led module of tunable optical,
This module is designed to utilize the dimmer modulated light, and said dimmer control is supplied to the cut of the alternating supply voltage of said led module, and this module comprises:
The selectivity that is used for-leadage circuit, said leadage circuit during said supply power voltage amplitude is lower than threshold value works drawing leakage current,
-control circuit; Said control circuit can be provided with indicating the signal of the activation of said leadage circuit; Said control circuit activates the value of the cut that index signal confirms to occur in the said alternating supply voltage of expression according to said releasing, and according to the cut value send control signal and
At least one drive circuit, said drive circuit is provided with said control signal, and the electric power of relevant LED lighting device is supplied with in adjustment.
Another aspect of the present invention relates to a kind of led module of tunable optical,
This module is designed to utilize the dimmer modulated light, and said dimmer control is supplied to the cut of the alternating supply voltage of said led module, and this module comprises:
The cut that-leadage circuit, said leadage circuit are used for occurring according to said alternating supply voltage is optionally worked drawing leakage current,
-control circuit; Said control circuit is provided with indicating the signal of the activation of said leadage circuit; Said control circuit activates the value of the cut that index signal confirms to occur in the said alternating supply voltage of expression according to said releasing, and according to the cut value send control signal and
At least one drive circuit, said drive circuit is provided with said control signal, and the electric power of relevant LED lighting device is supplied with in adjustment.
Said releasing activated index signal and can directly or indirectly be indicated in leakage current or the voltage of the resistance device that strides across said leadage circuit, and for example said resistance device is the resistance device of the joint effect of the activation of measuring said supply power voltage and said leadage circuit.
Said leadage circuit can be the circuit that separates with said control circuit, or the circuit of the integration section of said control circuit.
The said activation index signal of releasing can be a pulse signal.
Said control circuit can be confirmed the pulse duration of the said activation index signal of releasing.
Said leakage current can be constant, variation or pass through pulse regulation, especially control through active pulse width modulation (PWM).
Can or be non-whole supply voltage cycle termly in each cycle of supply voltage, produce the said activation index signal of releasing.
Said leadage circuit can comprise current source, and is activated passively, or said leadage circuit comprises the temporal logic of the switch of controlling said leadage circuit on one's own initiative.
Said control circuit can be designed to obtain according to said leadage circuit index signal the timing of arbitrary cut of timing and said alternating supply voltage of the zero crossing of said alternating supply voltage.
Relate to a kind of led module on the other hand, wherein, led module comprises leadage circuit and drive circuit, and said drive circuit is controlled the electric power of LED lighting device through the one or more modes in following:
-low frequency PWM control, pwm pulse have the frequency of twice level of the frequency of said alternating supply voltage, preferably have the frequency between 90Hz and 140Hz, and said pwm pulse preferably releases with said that to activate index signal synchronous,
The control of-high-frequency PWM, the frequency of pwm pulse is preferably more than 500Hz greater than 200Hz, and/or
The control of the amplitude of the direct current of-said LED lighting device of flowing through.
Can the power supply current potential and the said supply power voltage of said LED lighting device be isolated through the for example spacer assembly of optical coupler, wherein, said control circuit can connect the current potential of the primary side or the primary side of said spacer assembly.
The invention still further relates to a kind of improved LED lamp, comprise aforesaid led module.
Another aspect of the present invention relates to a kind of method that is used to operate the led module of tunable optical; Said module is used the dimmer modulated light; Said dimmer control is supplied to the phase place of the alternating supply voltage of said led module, and said dimmer is for example for having the dimmer of bidirectional thyristor, wherein:
The leadage circuit of-said led module optionally works during said supply power voltage amplitude is lower than threshold value drawing leakage current,
-control circuit, said control circuit are provided with indicating the signal of the activation of said leadage circuit, and according to said release activate index signal send control signal and
At least one drive circuit, said drive circuit is provided with said control signal, and the electric power of relevant LED lighting device is supplied with in adjustment.
Said release activate index signal directly or indirectly indication stride across in leakage current or the voltage of resistance device of said leadage circuit, for example measure the resistance device of joint effect of the activation of said supply power voltage and said leadage circuit.
The said activation index signal of releasing is a pulse signal, and said control circuit is confirmed the pulse duration of the said activation index signal of releasing.
Said control circuit can be confirmed the time of the zero crossing of said alternating supply voltage according to the estimated value of said pulse duration.
Said control circuit can be according to the measurement of the arbitrary cut angle that occurs in the synchronous said supply power voltage of the timing of said zero crossing.
Said leakage current can be constant, variation or pass through pulse regulation, especially control the switch of said leadage circuit through active PWM.
Can or be non-whole supply voltage cycle termly in each cycle of supply voltage, produce the said activation index signal of releasing.
Said leadage circuit can be activated passively, or said leadage circuit is for example controlled through switch on one's own initiative.
Description of drawings
From the detailed description of the preferred embodiment of the present invention that combines accompanying drawing as follows, other characteristics of the present invention, advantage and purpose will become obvious.
Fig. 1 illustrates first execution mode of the dimmable ballast that is used for the LED lighting device;
Fig. 2 illustrates first execution mode of the dimmable ballast that is used for the LED lighting device;
Fig. 3 is shown specifically first execution mode of leadage circuit of the present invention;
Fig. 4 is shown specifically second execution mode of the present invention;
Fig. 5 illustrates the output signal and corresponding R of forward position dimmer
ShuntThe leakage 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 that is used for the LED lighting device will be described with reference to Fig. 1 now.The primary side control (management) of LED electric power is proposed to be used for according to this first execution mode.
Notice that " primary side " and " primary side " relates separately to the primary side and the primary side of spacer assembly, this spacer assembly separates the current potential of said LED lighting device with supply power voltage, in the back illustrated in detail.
Can see that from Fig. 1 to the input filter of ballast 2 supply alternating supply voltages 1, this alternating supply voltage 1 for example is that frequency is that 50Hz or 60Hz and effective voltage are the AC supply voltage of 120V or 230V.
Be schematically shown like Fig. 1, for example through the manually operated dimmer of user, can this alternating supply voltage be carried out cut, this dimmer comprises bidirectional thyristor or the triode thyristor that is used for cut.The duration of cut is represented dimmer command.
Then, with output signal promptly the filtered alternating supply voltage of this input filter 2 be supplied to first rectifier 3 and second rectifier 4.
This first rectifier 3 is provided, with to these LED lighting device 5 transferring electric powers.
This second rectifier 4 is provided, with supply leadage circuit 6 and adjusting control circuit 7.
Note, also possibly only provide a rectifier to be used for and be used for this leadage circuit 6 to LED lighting device 5 transferring electric powers.
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 (for example) power supply as load, prevent that supply power voltage leakage current when driver is closed (gas coming through discharge lamp etc.) from increasing the input voltage of drive circuit and cause triggering and optical flare again.
Ii. can make input voltage follow the cut of supply power voltage more accurately through bidirectional thyristor.Because average commutating voltage or bus voltage are generally used for control system, this is very important for being avoided error.Voltage can drift about when the leadage circuit un-activation, when especially being attended by the leakage current of flow through dimmer or switch.
Iii. support bidirectional thyristor at the switching point holding current.
Iv. the input radio frequency that suppresses dimmer inside and dimmer and transducer disturbs oscillation behavior between (RFI) filter.
V. support to detect from forward position dimmer and the light modulation information of back along dimmer.
The output of this first rectifier 3 promptly after the filtering and the alternating supply voltage of rectification, can selectivity be supplied to:
-fill out paddy circuit 8 (for example active paddy circuit, the passive active-passive paddy circuit of filling out of filling out paddy circuit or combination filled out),
-active power switched factor correcting (PFC) circuit 9 (wherein, the switching of pfc circuit is by the control circuit control that receives at least one input signal), or
-filter circuit 10, this filter circuit 10 comprises for example electrolytic capacitor.
Rectification and the filtered supply power voltage handled like this then are supplied to led driver 11; This led driver 11 has DC-DC (DC/DC) transducer; This DC-DC (DC/DC) transducer for example is flyback converter 12, especially quasi-resonance flyback converter.Note, can use DC/DC transducer other isolation or non-isolation.Isolating also can be outside this DC/DC transducer.Because the step-down controller that the led module of tunable optical can comprise non-isolation is as the DC/DC transducer, so the led module of tunable optical can not isolated yet.
(FEEDBACK CONTROL) electric power that this led driver 11 is regulated to 5 supplies of LED lighting device.
Schematically show like Fig. 1, this LED lighting device 5 can be a plurality of LED that connect and/or be connected in parallel (or OLED, or the suitable lighting device of other electrical characteristics).
The feedback signal 13 of the electric current of indicating this LED lighting device of for example flowing through is fed back to this led driver 11.In the example shown, this led driver is a flyback converter 12, has primary side switch 14.Through adjusting the clock of this switch 14, can control the electric power that is supplied to this LED lighting device, so that when the measured value of this feedback signal 13 is not equal to rated value, control it near rated value.
Possibly this LED is set and use open-loop method through calibration with operation LED.According to phase dimmer signal from said leadage circuit, amplitude that can be through changing the LED electric current or only change the electric power that is supplied to this LED lighting device through pulse operation.
In general, this DC/DC transducer has at least one control that is used to change the electric power that is supplied to this LED lighting device 5 input.
The current potential of this LED lighting device 5 can with alternating supply voltage 1 potential isolation.In the example shown, in fact realize this isolation through the transformer 15 of AC/DC transducer 12.
For example the switch 14 through DC/DC transducer 12 carries out Current Control, and this Current Control is to be controlled by the output signal 6 of adjusting control circuit 7.Therefore, this adjusting control circuit 7 provides rated value through signal 16 for the electric power of this LED lighting device.
In fact control circuit 17 according to control (rated value) signal 16 of the feedback signal of measuring 13 and this adjusting control circuit 7, drives the for example switch 14 of led driver 11.
As schematically showing through Reference numeral 18, for example through optical coupler 18 with the potential isolation of this adjusting control circuit 7 with LED lighting device 5, and in this example, this adjusting control circuit 7 with exchanges supply voltage 1 less than isolation.Since can not will the potential isolation of this adjusting control circuit 7 and LED lighting device 5, this adjusting control circuit 7 can also be directly connected to primary side, for example this led driver 11.
Owing to carry out electric power (electric current) control of this LED lighting device 5 in the primary side of spacer assembly 15, therefore the execution mode with Fig. 1 is called the primary side adjusting.
The optional execution mode of Fig. 2 is realized the notion that primary side is regulated.Once more, alternating supply voltage is supplied to input filter 2, supplies with second rectifier 4 and pulse rectifier 3 then.In this execution mode, the output of first rectifier 3 likewise directly is supplied to led driver 11.Preferably, this led driver 11 also has spacer assembly 15, the transformer that for example illustrates.
Likewise send the output of second rectifier 4 to leadage circuit 6 and adjusting control circuit/interface 7.To understand, actual this circuit that refers to of term " interface " can receive the dim signal from the outside of bus, wireless mode (for example infrared ray (IR)) etc., and Reference numeral 19 schematically is appointed as in outside input.This obviously also is applicable to the execution mode of Fig. 1.
In the execution mode of Fig. 2, to regulate owing to carry out primary side, this adjusting control circuit/interface 7 for example through the switch 14 on the primary side that drives this transducer 11, is controlled this led driver 11.
Regulate (Fig. 2) or primary side adjusting (Fig. 1) for primary side, can utilize different choice to regulate the electric power of this LED lighting device 5.
First example is to regulate the DC level of the electric current of this LED lighting device 5 of flowing through.
Second selection is high-frequency impulse width modulated (PWM) control, and wherein, " high frequency " will be interpreted as that the current impulse of this LED lighting device 5 of flowing through of generation has the high frequency of frequency than the AC-input voltage of rectification.Therefore, under the ac power supply voltage condition, the high-frequency PWM pulse will have the frequency greater than 120Hz.
The 3rd to select be the PWM control of the electric power that consumed of this LED lighting device 5, and wherein, " low frequency " will be interpreted as that the low frequency pwm pulse of the electric current of the LED 5 that flows through has other frequency of supply power voltage level of rectification, for example 100Hz or 120Hz.
Fig. 3 is shown specifically the preferred implementation of the leadage circuit of being supplied by filtered alternating supply voltage 6, before being fed to this leadage circuit 6, this filtered alternating supply voltage is carried out rectification (diode bridge 3).
According to this execution mode, this leadage circuit 6 has constant-current source, and this constant-current source comprises transistor T 2, and this constant-current source is by the voltage control of the base-emitter of T2.
Can pass through the voltage V of the base-emitter of transistor seconds T2
BEControl the amplitude of this leakage current, for example be controlled in the scope of 10-50mA, preferably in the 20-30mA scope.
This temporal logic unit can be for example microcontroller, application-specific integrated circuit (ASIC) (ASIC) or its combination.
This temporal logic unit 21 detects the leakage current that produces at the input pin of this temporal logic unit 21.
Typically, at this input voltage (supply power voltage) lower and for example have the amplitude that is lower than 30Vpk (crest voltage) during, this this leakage current of temporal logic unit activating.Therefore, in a single day this temporal logic unit synchronous with alternating supply voltage, then near these low-voltage time periods (zero crossing), launches this leadage circuit, detects the activation of the leadage circuit of launching then.
Therefore, will be near the zero crossing of this alternating supply voltage, at R
ShuntLast detection current impulse in addition, when the bidirectional thyristor conducting in the manually operated dimmer, will be passed through R at the output of this temporal logic unit
ShuntDetect different leakage current pulses.During the cut of this alternating supply voltage, the amplitude of this supply power voltage is with step-down, and the R that only flows through
ShuntElectric current be quiescent current, this quiescent current needs to supply the electronic device of (keeping) dimmer, i.e. electronic device in the manually operated dimmer outside the LED lighting ballast.
Note, in the example shown, detect the activation of releasing, especially through measuring the timing and/or the width of leakage current pulse through measuring leakage current.This width is as the criterion with pulse of different reasons.
Yet, alternatively or even additionally, also can on power voltage line, detect the activation of this leadage circuit.Back literary composition will be described such example according to the modification of Fig. 6.
Fig. 4 illustrate according to leadage circuit 6 of the present invention ' another possible operation instruction.
According to this execution mode; Temporal logic unit 21 ' activation leakage current, and output pwm signal are through RC filter circuit (C1; R2) this pwm signal is carried out filtering, mos field effect transistor (MOSFET) switch M1 gets into conducting state for example to control.
Likewise, utilize measurement shunt R
ShuntThe leakage current that measure to produce, and with this leakage current be supplied to this temporal logic unit 21 ' input pin.
Fig. 5 illustrates the back along the output signal (top component) of dimmer with accordingly at shunt R
ShuntThe diagrammatic sketch that detects of pulse current.
Through observing pulse duration or pulse timing with the timing of the zero crossing that calculates this alternating supply voltage and the operating frequency of this alternating supply voltage, can forward position in the LED ballast or back be separated along detection algorithm, obtain the timing of cut from current impulse information.The position of narrower current impulse indication cut.Can detect wide current impulse (leakage current) and narrow current impulse (the cut technology of carrying out through bidirectional thyristor or triode thyristor in the dimmer) through temporal logic unit 21,21 ' respectively.
Therefore, can be used to from leadage circuit 6,6 ' current information detect dimmer cut regularly.Therefore, detected cut can be used as brightness adjustment control information, and can carry out " conversion " (above seeing: the DC electric current, high-frequency PWM or the low frequency PWM that change this LED lighting device of flowing through) through different modes.
In the simplest mode, the for example low frequency PWM of this LED lighting device 5 control, DC/DC transducer 11 out of service during detecting cut.
After enforcement along in the situation of detection algorithm; The problem that exists is: when dimmer turn-offed its MOSFET or equivalent, the underloading on the dimmer was so that cut information is followed in its output, therefore usually; Be not lower than 30Vpk if voltage is not reduced to, the leakage current pulse will can not occur.For accurate detected phase timing information, can use active or adaptive method activation leakage current.An example is that sustained activation leakage current in one or several cycle of alternating supply voltage is can pass through to measure shunt R
ShuntVoltage (when dimmer switch breaks off) or through detecting regularly at the detected power supply input voltage signal of the output of bridge rectifier 3.Be changed when dimmer but be low to moderate the consumption that is enough to leadage circuit 6,6 ' inside when remaining on the acceptable degree, the repetition rate that leakage current activates should be enough to fast detecting.
According to optional execution mode, can with the high-frequency PWM signal application in the switch of releasing (Fig. 4) with the restriction power consumption.This can be followed the trail of to detect the cut position during the voltage time section.
According to another optional execution mode, can activate leadage circuit at the one-period of alternating supply voltage, and can utilize average voltage prediction dimmer information.For example, can carry out in per 10 cycles once with the power consumption in the restriction leadage circuit.
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 through divider resistance R32, R33 and R34.This transistor is regulated transistor Q4, and this transistor Q4 has dual role as current source, for leadage circuit, is used to support the bidirectional thyristor holding current and is used for signalling represent to release activation." in the situation about activating, the voltage of transistor Q4 is by drop-down, and this can be as signal (the digital V of the activation of indicating this leadage circuit at the Q4 conducting of this transistor and so leadage circuit 6
Out).Break off at transistor Q4, and therefore this leadage circuit 6 " in the unactivated situation, resistance R 40 is drawn high the voltage of said transistor Q4, and this can be as the unactivated signal of this leadage circuit of indication (digital V
Out).As stated, during the amplitude of supply power voltage was lower than threshold value, " selectivity worked to draw leakage current this leadage circuit 6." the cut of depending in alternating supply voltage to be occurred of this leadage circuit 6.
The unactivated signal of indication leadage circuit (digital V 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 subject to noise effect, in the signal that noise or interference here can cause receiving error is arranged.
Yet, alternatively or even additionally, also can on power voltage line, detect leadage circuit 6 " activation.Can on divider resistance R32, R33 and R34, detect activation, on the base terminal of transistor Q5, detect power level.
Claims (20)
1. the LED module of a tunable optical,
Said module is designed to utilize the dimmer modulated light, and said dimmer control is supplied to the cut of the alternating supply voltage of said led module, and said module comprises:
-leadage circuit, said leadage circuit are used for during said supply power voltage amplitude is lower than threshold value, optionally working drawing leakage current,
-control circuit; Said control circuit is supplied the signal of the activation of the said leadage circuit of indication; Said control circuit activates the value of the cut that index signal confirms to occur in the said alternating supply voltage of expression according to said releasing, and according to the cut value send control signal and
-at least one drive circuit, said drive circuit is supplied said control signal, and the electric power of relevant LED lighting device is supplied with in adjustment.
2. led module as claimed in claim 1,
Wherein, Said release activate index signal directly or indirectly indication stride across in leakage current or the voltage of resistance device of said leadage circuit, said resistance device for example is the resistance device of the joint effect of the activation of measuring said supply power voltage and said leadage circuit.
3. as the described led module of aforementioned each claim,
Wherein, said leadage circuit is the circuit that separates with said control circuit, or the circuit of the integration section of said control circuit.
4. as the described led module of aforementioned each claim,
Wherein, the said activation index signal of releasing is a pulse signal.
5. led module as claimed in claim 4,
Wherein, said control circuit is confirmed the pulse duration of the said activation index signal of releasing.
6. as the described led module of aforementioned each claim,
Wherein, said leakage current is constant, variation or passes through pulse regulation, especially controls through active pulse width modulation (PWM).
7. as the described led module of aforementioned each claim,
Wherein, in each cycle of supply voltage or be non-whole supply voltage cycle termly, produce the said activation index signal of releasing.
8. as the described led module of aforementioned each claim,
Wherein, said leadage circuit comprises current source and is activated passively, or said leadage circuit comprises the timing logic of the switch of controlling said leadage circuit on one's own initiative.
9. as the described led module of aforementioned each claim,
Wherein, said control circuit is designed to obtain based on said leadage circuit index signal the timing of arbitrary cut of timing and said alternating supply voltage of the zero crossing of said alternating supply voltage.
10. led module, preferably according to aforementioned each claim,
Wherein, led module comprises leadage circuit and drive circuit, and said drive circuit is controlled the electric power of LED lighting device through the one or more modes in the following manner:
-low frequency PWM control, pwm pulse have the frequency of twice magnitude of the frequency of said alternating supply voltage, preferably have the frequency between 90Hz and 140Hz, and said pwm pulse preferably releases with said that to activate index signal synchronous;
-high-frequency PWM control, pwm pulse have greater than 200Hz, are preferably more than the frequency of 500Hz, and/or
The control of the amplitude of the direct current of-said LED lighting device of flowing through.
11. like the described led module of aforementioned each claim,
Wherein, through the spacer assembly of for example optical coupler, the power supply current potential and the said supply power voltage of said LED lighting device are isolated, wherein said control circuit is connected to the current potential of the primary side or the primary side of said spacer assembly.
12. an improved LED lamp comprises the described led module of aforementioned each claim.
13. a method that is used to operate the led module of tunable optical, said module is used the dimmer modulated light, and said dimmer control is supplied to the phase place of the alternating supply voltage of said led module, and said dimmer is for example for having the dimmer of bidirectional thyristor, wherein:
The leadage circuit of-said led module optionally works during said supply power voltage amplitude is lower than threshold value drawing leakage current,
-control circuit is supplied the signal of activation of the said leadage circuit of indication, and according to said release activate index signal send control signal and
-at least one drive circuit is supplied said control signal, and the electric power of relevant LED lighting device is supplied with in adjustment.
14. method as claimed in claim 13,
Wherein, Said release activate index signal directly or indirectly indication stride across in leakage current or the voltage of resistance device of said leadage circuit, said resistance device for example is the resistance device of the joint effect of the activation of measuring said supply power voltage and said leadage circuit.
15. like claim 13 or 14 described methods,
Wherein, the said activation index signal of releasing is a pulse signal, and said control circuit is confirmed the pulse duration of the said activation index signal of releasing.
16. method as claimed in claim 15,
Wherein, said control circuit is confirmed the timing of the zero crossing of said alternating supply voltage according to the estimated value of said pulse duration.
17. method as claimed in claim 16,
Wherein, said control circuit makes the measurement synchronization of the arbitrary cut angle that occurs in the said supply power voltage according to the timing of said zero crossing.
18. like each described method in the claim 13 to 17,
Wherein, said leakage current is constant, variation or passes through pulse regulation, especially controls the switch of said leadage circuit through active PWM.
19. like each described method in the claim 13 to 18,
Wherein, in each cycle of supply voltage or be non-whole supply voltage cycle termly, produce the said activation index signal of releasing.
20. like each described method in the claim 13 to 18,
Wherein, said leadage circuit is activated passively, or said leadage circuit is for example controlled through switch on one's own initiative.
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 true CN102598857A (en) | 2012-07-18 |
| CN102598857B CN102598857B (en) | 2015-05-20 |
Family
ID=43500496
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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105265019A (en) * | 2013-06-05 | 2016-01-20 | 皇家飞利浦有限公司 | Apparatus for controlling light module |
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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 |
| RU2669381C2 (en) * | 2012-01-06 | 2018-10-11 | Филипс Лайтинг Холдинг Б.В. | Electrical device and method for compensating an effect of an electrical current of a load, in particular a led unit, and driver device for driving a load, in particular a led unit |
| US9450505B2 (en) | 2012-01-20 | 2016-09-20 | Osram Gmbh | Optoelectronic component device |
| US9326344B2 (en) | 2012-02-02 | 2016-04-26 | Koninklijke Philips N.V. | LED light source with trailing edge phase cut dimming |
| 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 |
| 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 |
| CA2891796A1 (en) * | 2014-08-19 | 2015-07-10 | 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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Also Published As
| Publication number | Publication date |
|---|---|
| CN102598857B (en) | 2015-05-20 |
| EP2489242A1 (en) | 2012-08-22 |
| WO2011045372A1 (en) | 2011-04-21 |
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