CN102577607B - The method of the brightness of control LED - Google Patents
The method of the brightness of control LED Download PDFInfo
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- CN102577607B CN102577607B CN201080046347.XA CN201080046347A CN102577607B CN 102577607 B CN102577607 B CN 102577607B CN 201080046347 A CN201080046347 A CN 201080046347A CN 102577607 B CN102577607 B CN 102577607B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000694 effects Effects 0.000 claims description 24
- 230000010354 integration Effects 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 230000002123 temporal effect Effects 0.000 description 12
- 230000004913 activation Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 2
- 238000003708 edge detection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007634 remodeling Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/357—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
-
- 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]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
-
- 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
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Abstract
For the method for the brightness of control LED, wherein, dimmable LED module is connected to dimmer, wherein, described dimmable LED module comprises leadage circuit (6), the method is characterized in that the periodicity of leakage current applies, wherein, the described periodicity of leakage current applies only to apply in the mains half-cycle of specific quantity, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.
Description
The present invention relates to the method for the brightness for control LED, wherein dimmable LED module is connected to the dimmer being also known as (phasefired) controller of lighting a fire mutually.
Technical field
In order to save energy, nowadays often use electricity-saving lamp.Along with the efficient light-emitting diode of introducing (LED) is as potential light source, also there is the demand of the electricity-saving lamp for the use LED with dimming capability.These systems must provide the function of dimming interface, use especially for together with phase dimmer.There is polytype usually available dimmer.Those adopt the device of TRIAC (triac) or thyristor (thyristor) to operate according to closely similar mode.Both serve as speed-sensitive switch, and be used to the electric flux controlling to be passed to lamp in the dimmer itself in order.They carry out " amplitude limit (chopping) " by offset of sinusoidal mains voltage waveform and carry out.Trigger or firing pulse determine the point that this device goes into action.The igniting of this device is slower, and it goes into action slower, and therefore, fewer electric power is transmitted to load.
Background technology
Proposed various circuit arrangement, dimming function is added into LED-based light source by these circuit arrangements.
An example is EP1016062B1, and wherein LED can pass through number bus (such as, passing through DMX) and controls.
Subject matter is the compatibility of common TRIAC dimmer when using together with LED driver circuit, and provides dim signal according to the control of phase dimmer.Thus, the present invention is devoted to provide a kind of Method and circuits solving this problem.
Summary of the invention
The present invention proposes a kind of for based on to for one or more LED, OLED or tangent (phasecut) of alternating supply voltage of operating means of other light-emitting device any compared with their electrical characteristics can handle the solution through improving of LED being carried out to light modulation.
The present invention attempts to provide one to make it possible to carry out via the tangent dimmer of common GLS (such as, by TRIAC or thyristor) with low-power consumption another switching device shifter of light modulation.
This object is realized by the feature of independent claims.Dependent claims has further developed central idea of the present invention.
According to the present invention, provide a kind of method of the brightness for control LED, wherein, dimmable LED module is connected to dimmer, wherein, described dimmable LED module comprises (bleeding) circuit of releasing serving as phase dimmer and keep the load of electric current
It is characterized in that the periodicity of leakage current applies, wherein, the described periodicity of leakage current applies only to apply in the mains half-cycle of specific quantity, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.
The invention still further relates to dimmable LED module, this module is designed to utilize the tangent dimmer controlling to be supplied to the alternating supply voltage of described LED module to carry out light modulation, and this module comprises:
Leadage circuit (6), this leadage circuit is used for according to tangently optionally working of existing in described alternating supply voltage, to draw leakage current,
It is characterized in that the periodicity of leakage current applies, wherein, the described periodicity of leakage current applies only to apply in the mains half-cycle of specific quantity, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.
Another aspect of the present invention relates to dimmable LED module,
This module is designed to utilize the tangent dimmer controlling to be supplied to the alternating supply voltage of described LED module to carry out light modulation, and this module comprises:
-for optionally working the leadage circuit drawing leakage current,
-optionally activate the control circuit of described leadage circuit, this control circuit is provided with the signal of the activity indicating described leadage circuit, this control circuit determines to represent in described alternating supply voltage the tangent value existed based on activity indicative signal of releasing, and send the control signal of the function as this tangent value, and
-at least one drive circuit, this at least one drive circuit is provided with described control signal and regulates the electric power provided explicitly with LED light emission device.
This activity indicative signal of releasing can indicate one in the leakage current at the resistance device two ends of described leadage circuit or voltage directly or indirectly, for example, as measure supply power voltage and as described in the resistance device of combined effect of activity of leadage circuit.
Described leadage circuit can be the circuit of the circuit independent of control circuit or the integration section as this control circuit.
Described activity indicative signal of releasing can be pulse signal.
Described control circuit to be released the pulse duration of activity indicative signal described in can determining.
Described leakage current can be steady, variable or pulsed, especially can be that active PWM controls formula.
Described activity indicative signal of releasing can generate for each cycle of supply voltage or periodically (that is, not for all mains voltage cycle) generates.
Described leadage circuit can comprise current source, and described leadage circuit can include the timing logic that seedbed controls the switch of described leadage circuit.
Described control circuit can be designed as and obtains the timing of zero crossing (zerocrossings) of described alternating supply voltage and the timing of any tangent timing of described alternating supply voltage based on described leadage circuit index signal.
On the other hand relate to LED module, wherein, LED module comprise leadage circuit and via one or more mode in following multiple mode to control the drive circuit of the electric power of LED light emission device:
-low frequency PWM controls, and this pwm pulse has the frequency of the rank of the twice of the frequency being in alternating supply voltage, preferably has the frequency between 90Hz and 140Hz, and this pwm pulse is preferably synchronous with described activity indicative signal of releasing,
-high-frequency PWM controls, and this pwm pulse has the frequency being greater than 200Hz, is preferably more than 500Hz, and/or
-control the amplitude of the DC electric current by LED light emission device.
The power supply electromotive force of LED light emission device is isolated by spacer assembly (for example, as optical coupler) and supply power voltage, and wherein, described control circuit can be connected to the primary side of this spacer assembly or the electromotive force of primary side.
The invention still further relates to (retrofit) LED of remodeling, the LED of this remodeling comprises LED module as above.
The present invention relates to the method for operating dimmable LED module on the other hand, this module utilizes control to be supplied to the dimmer of the phase place of the alternating supply voltage of described LED module (for example, as having the dimmer of TRIAC) carry out light modulation, wherein
The leadage circuit of-described LED module optionally works to draw leakage current,
-control circuit optionally activates described leadage circuit, and described control circuit is provided with the signal of the activity indicating described leadage circuit, and sends the control signal based on this activity indicative signal of releasing, and
-at least one drive circuit is provided with described control signal and regulates the electric power provided explicitly with LED light emission device.
Described activity indicative signal of releasing indicates one in the leakage current at the resistance device two ends of described leadage circuit or voltage directly or indirectly, for example, as measure supply power voltage and as described in the resistance device of combined effect of activity of leadage circuit.
Described activity indicative signal of releasing is pulse signal, and described control circuit determine described in release the pulse duration of activity indicative signal.
Described control circuit can based on the timing of the zero crossing estimation of described pulse duration being determined to described alternating supply voltage.
Described control circuit can make the measurement of any phase corner cut existed in described supply power voltage synchronous based on the timing of described zero crossing.
Described leakage current can be steady, variable or pulsed, especially can carry out active PWM control to the switch of described leadage circuit.
Described activity indicative signal of releasing can generate for each cycle of supply voltage or periodically (that is, not for all mains voltage cycle) generates.
Described leadage circuit can passively activate, or described leadage circuit such as actively controls via switch.
By reference to the accompanying drawings, according to below to the detailed description of the preferred embodiment of the present invention, further feature of the present invention, advantage and object will be apparent.
Accompanying drawing explanation
For contributing to understanding the present invention, below with reference to accompanying drawings, the preferred embodiment of the present invention is described, in accompanying drawing by any restrictive, sense by means of only example:
Fig. 1 shows the first execution mode of the dimmable ballast (ballast) for LED light emission device;
Fig. 2 shows the first execution mode of the dimmable ballast for LED light emission device;
Fig. 3 shows the preferred implementation of the dimmable ballast for LED light emission device;
Fig. 4 shows the preferred implementation of leadage circuit device of the present invention;
Fig. 5 shows the typical waveform when applying of the present invention;
Fig. 6 shows another execution mode of leadage circuit device of the present invention; And
Fig. 7 shows in detail another embodiment of the present invention.
Embodiment
Below with reference to Fig. 1, the first execution mode of the dimmable ballast for LED light emission device is described.According to this first execution mode, the primary side proposed for LED electrical power controls (adjustment).
It should be noted that, " primary side " and " primary side " relate separately to primary side and the primary side of the spacer assembly be separated with supply power voltage by the electromotive force of LED light emission device, as after a while by detailed description.
As can be seen from Figure 1, alternating supply voltage 1 (for example, if frequency is the AC supply voltage of 50Hz or 60Hz and the RMS voltage of 120V or 230V) is supplied to the input filter 2 of ballast.
As shown in Figure 1 schematically, this alternating supply voltage can such as by being undertaken tangent by the manually operated dimmer of user, and this dimmer comprises for tangent TRIAC or thyristor.The tangent duration represents dimmer command.
Then both the first rectifier 3 and the second rectifier 4 is supplied to by outputing signal (that is, the alternating supply voltage through filtering of input filter 2).
First rectifier 3 is set, electric power is sent to LED light emission device 5.
Second rectifier 4 is set, to be fed to leadage circuit 6 and adjusting control circuit 7.
It should be noted that, single rectifier can also be only set for both the electric power transfer of LED light emission device 5 and leadage circuit 6.
The output of the first rectifier 3 (that is, through the alternating supply voltage of filtering and rectification) can be supplied to alternatively
-fill out paddy (valley-fill) circuit 8 (such as, actively fill out paddy circuit, passively fill out paddy circuit or combination active-passive fills out paddy circuit),
-active switching pfc circuit 9 (wherein, the switch of pfc circuit is controlled by the control circuit receiving at least one input signal), or
-comprise the filter circuit 10 of such as electrolytic capacitor.
Then, the supply power voltage of the rectification through processing like this and filtering is supplied to the LED driver 11 with DC/DC converter (for example, as inverse-excitation type (flyback) converter 12, especially, quasi-resonance inverse excitation type converter).It should be noted that, the DC/DC converter of other isolation or non-isolated can be used.This isolation can also in the outside of DC/DC converter.This dimmable LED module can also be non-isolated, as comprised non-isolated buck converter (buck-converter) as DC/DC converter.
LED driver 11 provides through regulating the electric power of (FEEDBACK CONTROL) for LED light emission device 5.
As shown in Figure 1 schematically, can there are multiple LED (or OLED, or have other light-emitting device of comparable electrical characteristics) that can connect and/or be connected in parallel in LED light emission device 5.
Instruction is such as fed back to LED driver 11 by the feedback signal 13 of the electric current of LED light emission device.The LED driver as inverse-excitation type (flyback) converter 12 in shown example has primary side switch 14.
By the timing of by-pass cock 14, can control the electric power being supplied to LED light emission device, be close to nominal value to make to be controlled by the measured value of feedback signal 13 when the measured value of feedback signal 13 is different from nominal value.
LED can be set via calibration, and open-loop method can be accepted work to make LED.Can according to the phase dimmer signal derived by leadage circuit to the correction of the electric power being supplied to LED light emission device, by changing the amplitude of LED current or carrying out by means of only burst operation.
Generally speaking, DC/DC converter has at least one control inputs, to revise the electric power being supplied to LED light emission device 5.
The electromotive force of LED light emission device 5 can with alternating supply voltage 1 potential isolation.In the example shown, this isolation realizes actually by the transformer 15 of AC/DC converter 12.
Current Control such as via the switch 14 of DC/DC converter 12 performs just as the output signal 16 by adjusting control circuit 7 controls.Adjusting control circuit 7 provides the nominal value of LED light emission device electric power thus via signal 16.
In fact control circuit 17 drives the switch 14 of such as LED driver 11 according to (nominal value) signal 16 controlled of measured feedback signal 13 and adjusting control circuit 7.
As schematically shown via label 18, adjusting control circuit 7 is such as by the potential isolation of optical coupler 18 with LED light emission device 5, and as in this example, adjusting control circuit 7 is not isolated with alternating supply voltage 1.Due to can not the potential isolation of adjusting control circuit 7 and LED light emission device 5, so adjusting control circuit 7 can also be directly linked to primary side, such as, LED driver 11.
Electric power (or electric current) due to LED light emission device 5 controls to perform in the primary side of spacer assembly 15, regulates so the execution mode of Fig. 1 to be called primary side.
The alternative embodiment of Fig. 2 realizes the concept of primary side adjustment.In addition, alternating supply voltage is provided to input filter 2, and is then provided to the burst rectifier 3 in the second rectifier 4.In this embodiment, the output of the first rectifier 3 is directly supplied to LED driver 11 again.Preferably, LED driver 11 also has spacer assembly 15, for example, and transformer as illustrated.
The output of the second rectifier 4 is forwarded to both leadage circuit 6 and adjusting control circuit/interface 7 again.Should be appreciated that term " interface " refer to this circuit can from bus, wirelessly (such as, IR) etc. receive the fact of external dimmer signal, this outside inputs and is schematically indicated as label 19 (external control interface).This is obviously also applied to the execution mode of Fig. 1.
In the execution mode of Fig. 2, the execution regulated along with primary side, light adjusting circuit/interface 7 such as controls LED driver 11 by the switch 14 in the primary side of driving transducer 11.
Regulate (Fig. 2) or primary side to regulate (Fig. 1) for primary side, the electric power of different options to LED light emission device 5 can be used to modulate.
First example is modulated the DC level of the electric current by LED light emission device 5.
Second option is that high-frequency PWM controls, and wherein, " high frequency " is interpreted as having the frequency higher than the frequency of the AC-input voltage of institute rectification by the current impulse obtained of LED light emission device 5.Thus, when AC supply voltage is powered, high-frequency PWM pulse has the frequency being greater than 120Hz.
3rd option controls the PWM of the electric power dissipated by LED light emission device 5, and wherein, " low frequency " is interpreted as the frequency of the rank by the low frequency pwm pulse of the electric current of LED5 with the frequency of the supply power voltage of institute's rectification, such as, 100Hz or 120Hz.
Fig. 3 shows the preferred implementation according to LED drive device of the present invention.
In the embodiment of fig. 3, the execution regulated along with primary side, light adjusting circuit/interface 7 such as controls LED driver 11 by the switch 14 in the primary side of driving transducer 11.
Light adjusting circuit/interface 7 can also be connected to other sensing apparatus.Light adjusting circuit/interface 7 can be connected to external control interface 19.External control interface 19 can be connected to pir sensor, photoelectric tube or other transducer.Thus, external control interface 19 may be used for Detection of Existence or ambient light intensity detection.Utilize tangent signal via the brightness adjustment control of power supply and the control on external control interface 19 by combination, the tunable optical rectifier for LED light emission device automatically can control by user's (by dimmer 1) Non-follow control and by other sensing apparatus (by external control interface 19).
Fig. 4 shows the preferred implementation of leadage circuit 6 device of the present invention.This leadage circuit 6 is provided with the alternating supply voltage through filtering, and this alternating supply voltage was rectified before being provided to leadage circuit 6 (diode bridge 4).
In a preferred embodiment of the invention, shown leadage circuit is a part for LED driver circuit, such as, as the tunable optical rectifier for LED light emission device, namely, as a part for the LED for using together with common GLS phase dimmer, preferably, such as the tangent dimmer of leading edge (leadingedge) and trailing edge (trailingedge) dimmer such as uses TRIAC or thyristor.Leadage circuit is connected to the power supply input of LED driver circuit.
Such as, this leadage circuit can be arranged on after the power-supply filter 2 of LED driver circuit, or in parallel with the power rectifier (3) of LED driver circuit.Leadage circuit 6 can comprise steady current source (T1, T2).
Key feature of the present invention is that the periodicity of sufficiently high leakage current applies, to reach dimmer keeping & latch-current, but this periodicity of sufficiently high leakage current applies only to apply in enough mains half-cycle, to keep controlled dissipation.This means, this of sufficiently high leakage current periodically applies only to occur for the mains half-cycle of specific quantity, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.In other words, leadage circuit 6 uses by a kind of burst mode.The feature of this burst mode is, the periodicity of sufficiently high leakage current applies only for the mains half-cycle of specific quantity, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.Preferably, the quantity applying the power cycle of leakage current is less than the quantity of the power cycle not applying leakage current.
Control of releasing can be undertaken by temporal logic unit 21 (control unit U6), preferably, can also use microcontroller or ASIC.
Apply by using the periodicity of sufficiently high leakage current, the detection through improving to leading edge & trailing edge (laggingedge) both dimmer signal can be realized, and by this realization, the larger support to dimmer (TRIAC) can be realized.
Owing to needing intelligence to distinguish different leadage circuit current timing signals, so can logical block 21 service time (control unit U6) (being preferably microcontroller), to monitor power supply input (to detect by dimmer (such as, TRIAC) dim signal that provides), and the periodicity controlling sufficiently high leakage current applies.
Bleed current signal (passes through R
shunt) detect dimmer signal.
The present invention can because obtain circuit intelligence and provide through improve power detecting and light modulation linear.Owing to there is available temporal logic unit 21 (such as, microcontroller), so can automatically generate digital dimming signal or simulation dim signal via this temporal logic unit 21 (such as, microcontroller).
The invention enables and can realize very high input pulse electric current by some phase angles.
The delay of the adjustment to LED current may be there is because of the lower sampling time.
Temporal logic unit 21 as the output preferably by digital signal can switching transistor T1, flows through the first resistor R to activate
series, transistor T1 (when closed) and measure shunt R
shuntleakage current.
Via the base emitter voltage VBE of transistor seconds T2, can be the scope of such as 10mA-50mA by the amplitude controlling of leakage current, the preferably scope of 20mA-30mA.
Temporal logic unit 21 can be such as microcontroller, ASIC or their mixing.
Temporal logic unit 21 senses the leakage current obtained at the input pin place of temporal logic unit 21.
Usually, this leakage current is by temporal logic unit for the lower periodic activation of input voltage (supply power voltage), and this leakage current such as has the amplitude being less than 30Vpk.Thus, this temporal logic unit once synchronous with alternating supply voltage, then at these low-voltage cycle (around zero crossing) enable leadage circuits, and then detects the activity of enable leadage circuit.
Therefore, at R
shuntthe current impulse near the zero crossing of alternating supply voltage is detected at place, and, when the dimmer (TRIAC) in manual operation dimmer is connected, pass through R in the input of temporal logic unit
shuntsense different leakage current pulses.
During the tangent period of alternating supply voltage, supply power voltage amplitude by step-down, by means of only R
shuntthe electric current drawn is supply (maintenance) dimmer electronic device (that is, the electronic device in the manual operation dimmer outside the luminous rectifier of LED) necessary quiescent current.
It should be noted that, in the example shown, sensing by measuring leakage current (timing of especially leakage current pulse and/or width) activity of releasing.This width be used as have different reason pulse distinguish standard.
But, even the activity of leadage circuit alternatively additionally can sense on supply voltage circuit.After a while a modified example as Fig. 6 is described this example.
Fig. 5 shows the illustration of trailing edge dimmer output signal (upper figure, Vin) and the activation cycle shown in figure below.
As mentioned above, key feature of the present invention is that the periodicity of sufficiently high leakage current applies, and wherein, this periodicity of sufficiently high leakage current applies only to apply in enough mains half-cycle, to keep controlled dissipation.For the example of Fig. 5, the periodicity of leakage current applies only to occur for two mains half-cycle, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.
During the activation period of leadage circuit 6, keep electric current (IH) can be drawn by dimmer, and LED driver 11 can draw electric power (IL) from AC power supplies 1.
It should be noted that, leadage circuit 6 can by reconditioning during the activation period, and leadage circuit 6 need not be activated on the whole activation period, and as previously mentioned, the chopping of leadage circuit 6 or reconditioning can also reduce electrical dissipation.
If the activation of leadage circuit 6 does not refer to that this leadage circuit 6 is activated, automatically draw leakage current, because the activity of leadage circuit 6 can also depend on other parameter, such as, the amplitude of supply voltage or the state of dimmer.An example is, leadage circuit 6 supply power voltage amplitude lower than threshold value and this leadage circuit 6 is activated by temporal logic unit 21 time work to draw leakage current.
Trailing edge or leading edge detection algorithm can be divided into LED rectifier and derive tangent timing according to current impulse information, with the operating frequency of the timing and this alternating supply voltage that calculate the zero crossing of alternating supply voltage by the pulse duration or timing of checking pulse.Narrower current impulse indicates tangent position.
Can be performed by temporal logic unit 21 separately this detection of wider current impulse (leakage current) and narrower current impulse (the tangent type of being undertaken by the TRIAC in dimmer or thyristor).
Thus, utilize the current information from leadage circuit 6, the tangent timing of dimmer can be detected.Thus, detected tangently can be used as dimmer control information, and " translation " (see above, according to high-frequency PWM or low frequency PWM, the DC electric current by LED light emission device being modulated) can be carried out in different ways.
According to most plain mode, such as, control according to the low frequency PWM of LED light emission device 5, the detected tangent period that operates in of DC/DC converter 11 stops.
When trailing edge detection algorithm should be realized, there is following problem: when dimmer makes its MOSFET or equivalent cut-off, load on this dimmer is typically not enough to and makes it export can to follow tangent information, if and then voltage does not drop under 30Vpk, then there will not be leakage current pulse.In order to detected phase timing information exactly, active approach or adaptive approach can be utilized to activate leakage current.An example is, the one or more cycles for alternating supply voltage activate leakage current continuously, to make it possible to via measurement shunt R
shuntthe voltage at (when dimmer switch disconnects) place or detect timing via the supply power voltage input signal that can detect in the output of bridge rectifier 3.The repetition rate activated for leakage current should enough detect when dimmer changes rapidly, but enough low so that the dissipation of leadage circuit 6,6 ' inside is remained on acceptable level again.
According to the execution mode of alternative, the pwm signal with high frequency can be applied to switch of releasing (Fig. 4), to limit electrical dissipation.This can in the enterprising line trace of whole voltage period, to detect tangency location.
According to the present invention, leadage circuit activates the one-period that may be used for alternating supply voltage, and average voltage can be used for predicting dimmer information.This can perform, to limit the electrical dissipation in leadage circuit in such as every 10 cycles.
Fig. 6 shows another execution mode of leadage circuit 6 device of the present invention.With the example of Fig. 4 unlike, detect dimmer signal (directly measuring voltage in the output of rectifier 4) on power supply voltage signal instead of in bleed current signal.
According to this execution mode, via resitstance voltage divider R49, R48 and R46, the output of rectifier 4 is carried out the detection to power level.
The activation of leadage circuit 6 can depend on the electric current (that is, flowing to the electric current of the filter circuit 10 comprising capacitor) of the output from the first rectifier 3 in addition.This leakage current is only enabled lower than during given threshold value at the electric current entering filter circuit 10 (or the pfc circuit 9 of active switching or fill out paddy circuit 8).
Fig. 7 shows another the possible document according to leadage circuit 6 ' of the present invention.
According to this execution mode, timing logic unit 21 ' activates the leakage current of output pwm signal, carries out filtering by RC filter circuit (C1, R2) to this leakage current, will such as control as conducting state by switch mosfet M1.
Further, the leakage current obtained utilizes measures shunt R
shuntmeasure, and be provided to the input pin of timing logic unit 21 '.
Claims (14)
1. the method for the brightness of control LED, wherein, dimmable LED module is connected to dimmer, wherein, described dimmable LED module comprises leadage circuit (6), the method is characterized in that the periodicity of leakage current applies, wherein, the described periodicity of leakage current applies in the mains half-cycle of specific quantity, only apply the controlled dissipation keeping described LED module, is the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity.
2. method according to claim 1, the method is characterized in that, dimmer signal is detected during the described periodicity of leakage current applies, and is used as the dimming information for the LED driver circuit be included in described dimmable LED module (11).
3. method according to claim 2, the method is characterized in that, described dimmer signal is also used as the dimming information for described LED driver circuit during the period not applying leakage current.
4. according to the method in claim 2 or 3, the method is characterized in that, dimming information stores in memory at least temporarily.
5. method according to claim 2, the method is characterized in that, dimming information is used to the adjustment of LED current.
6. a dimmable LED module,
This module is designed to utilize the tangent dimmer controlling to be supplied to the alternating supply voltage of described LED module to carry out light modulation, and this module comprises:
Leadage circuit (6), this leadage circuit is used for drawing leakage current according to described tangent optionally the working existed in described alternating supply voltage,
The feature of this LED module is that the periodicity of leakage current applies, wherein, the described periodicity of leakage current applies in the mains half-cycle of specific quantity, only apply the controlled dissipation keeping described LED module, the multiple mains half-cycle not applying leakage current after the mains half-cycle of this specific quantity
Wherein, described LED module comprises the control circuit optionally activating described leadage circuit further, and described control circuit is provided with the activity indicative signal of releasing of the activity indicating described leadage circuit.
7. LED module according to claim 6,
The feature of this LED module is, dimmer signal is detected during the described periodicity of leakage current applies, and is used as the dimming information for LED driver circuit (11).
8. the LED module according to any one in claim 6 or 7,
Wherein, described leadage circuit is the circuit independent of the circuit of described control circuit or the integration section as described control circuit.
9. LED module according to claim 6,
Wherein, activity indicative signal of releasing described in is pulse signal.
10. LED module according to claim 9,
Wherein, described control circuit determine described in release the pulse duration of activity indicative signal.
11. LED modules according to claim 6,
Wherein, described leakage current is steady, variable or pulsed.
12. LED modules according to claim 6,
Wherein, described leadage circuit comprises current source and is passively activated, or described leadage circuit includes the timing logic that seedbed controls the switch of described leadage circuit.
13. LED modules according to claim 6,
Wherein, described control circuit is designed to the timing obtaining the timing of the zero crossing of described alternating supply voltage and any tangent of described alternating supply voltage based on described activity indicative signal of releasing.
14. LED modules according to claim 11,
Wherein, described leakage current is that active PWM controls formula.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT6412009 | 2009-10-14 | ||
| ATGM641/2009 | 2009-10-14 | ||
| AT4952010 | 2010-08-06 | ||
| ATGM495/2010 | 2010-08-06 | ||
| PCT/EP2010/006277 WO2011045057A1 (en) | 2009-10-14 | 2010-10-14 | Method for controlling the brightness of an led |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102577607A CN102577607A (en) | 2012-07-11 |
| CN102577607B true CN102577607B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080046347.XA Expired - Fee Related CN102577607B (en) | 2009-10-14 | 2010-10-14 | The method of the brightness of control LED |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2489243A1 (en) |
| CN (1) | CN102577607B (en) |
| DE (1) | DE112010004050B4 (en) |
| WO (1) | WO2011045057A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101065709B1 (en) | 2011-06-15 | 2011-09-19 | 엘지전자 주식회사 | A method of controlling a lighting device, a lighting apparatus, and a lighting system |
| AU2012244104B2 (en) * | 2011-10-07 | 2014-05-29 | Schneider Electric South East Asia (Hq) Pte Ltd | Dimmable light emitting diode load driver with bypass current |
| EP2608636A1 (en) * | 2011-12-19 | 2013-06-26 | Nxp B.V. | Method and apparatus for management of power supplied from a phase-cut ac supply |
| CN104115560B (en) | 2012-02-01 | 2017-12-26 | 飞利浦照明控股有限公司 | Actuator device and the driving method for driving the especially load of LED unit |
| US9000683B2 (en) | 2013-02-26 | 2015-04-07 | Power Integrations, Inc. | Bleeder circuit having current sense with edge detection |
| US9210744B2 (en) | 2012-04-18 | 2015-12-08 | Power Integrations, Inc. | Bleeder circuit for use in a power supply |
| TWI462640B (en) * | 2012-12-25 | 2014-11-21 | Unity Opto Technology Co Ltd | Adaptive LED dimming drive circuit |
| US9089012B2 (en) | 2013-05-24 | 2015-07-21 | Terralux, Inc. | Secondary-side sensing of phase-dimming signal |
| US9307593B1 (en) * | 2014-09-15 | 2016-04-05 | Dialog Semiconductor Inc. | Dynamic bleeder current control for LED dimmers |
| EP4344035A1 (en) * | 2022-09-20 | 2024-03-27 | Tridonic GmbH & Co. KG | Resonant hybrid flyback converter with overcurrent detection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513122A (en) * | 2006-09-04 | 2009-08-19 | 路创电子公司 | Variable load circuits for use with lighting control devices |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6016038A (en) | 1997-08-26 | 2000-01-18 | Color Kinetics, Inc. | Multicolored LED lighting method and apparatus |
| CN100546418C (en) * | 2004-05-19 | 2009-09-30 | 高肯集团有限公司 | Be used for the light adjusting circuit of LED lighting apparatus and the device that keeps the TRIAC conducting |
| US7656103B2 (en) * | 2006-01-20 | 2010-02-02 | Exclara, Inc. | Impedance matching circuit for current regulation of solid state lighting |
| US8040070B2 (en) | 2008-01-23 | 2011-10-18 | Cree, Inc. | Frequency converted dimming signal generation |
| GB0811713D0 (en) * | 2008-04-04 | 2008-07-30 | Lemnis Lighting Patent Holding | Dimmer triggering circuit, dimmer system and dimmable device |
-
2010
- 2010-10-14 WO PCT/EP2010/006277 patent/WO2011045057A1/en active Application Filing
- 2010-10-14 EP EP10771335A patent/EP2489243A1/en not_active Withdrawn
- 2010-10-14 DE DE112010004050.8T patent/DE112010004050B4/en active Active
- 2010-10-14 CN CN201080046347.XA patent/CN102577607B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513122A (en) * | 2006-09-04 | 2009-08-19 | 路创电子公司 | Variable load circuits for use with lighting control devices |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102577607A (en) | 2012-07-11 |
| DE112010004050T5 (en) | 2012-12-20 |
| WO2011045057A1 (en) | 2011-04-21 |
| DE112010004050B4 (en) | 2023-01-19 |
| EP2489243A1 (en) | 2012-08-22 |
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