CN104066253A - Light modulation control system and method using TRIAC light modulator - Google Patents
Light modulation control system and method using TRIAC light modulator Download PDFInfo
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- CN104066253A CN104066253A CN201410322602.9A CN201410322602A CN104066253A CN 104066253 A CN104066253 A CN 104066253A CN 201410322602 A CN201410322602 A CN 201410322602A CN 104066253 A CN104066253 A CN 104066253A
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Abstract
The invention provides a light modulation control system and method using a TRIAC light modulator. The light modulation control system comprises one or more signal processing components. The signal processing components are arranged to receive first signals associated with the TRIAC light modulator, generate second digital pulse type signals according to the first signals, and send the second signals to a switch so as to control a switch to be turned on or off for controlling the current output to a light emitting element.
Description
Technical field
The present invention relates to integrated circuit, relate more specifically to use dimming control system and the method for TRIAC dimmer (TRIAC dimmer).
Background technology
The illuminator that comprises light-emitting diode (LED) is usually used and is comprised that the conventional lights dimmer (for example, wall mounted) that exchanges triode (TRIAC, Triode for Alternating Current) regulates the brightness of LED.TRIAC is two-way and electric current can for example, at the either direction TRIAC (, flow to TRIAC or flow out TRIAC) that flows through.TRIAC can for example, be triggered by grid current (, in either direction flow), and grid current normally applies by the grid to TRIAC that voltage (for example, positive voltage or negative voltage) generates.Once be triggered, TRIAC for example just continues guide current, until till electric current drops under certain threshold value (, maintaining electric current).
Fig. 1 is the simplification diagram that traditional LED illuminator of using TRIAC dimmer is shown.For example, illuminator 100 realizes that primary side is adjusted scheme and for driving the inverse-excitation type structure with single-level power factor correction (PFC) of one or more LED172.System 100 comprises controller 102, AC provisioning component 122, TRIAC dimmer 118, full-wave rectification bridge 124, capacitor 126,136,140,150 and 170, resistor 128,130,134,138,146,148,154 and 156, mains switch 132 and 152, diode 142,144 and 168 and the transformer that comprises armature winding 162, secondary winding 164 and auxiliary winding 166.Controller 102 comprises terminal 104,106,108,110,112,114,116 and 120.For example, mains switch 132 and 152 is transistors.In another example, TRIAC dimmer 118 is to comprise the dimmer that exchanges triode (TRIAC).
As shown in Figure 1, the AC input signal 121 that TRIAC dimmer 118 is processed from AC provisioning component 122, and generate the voltage signal 123 of being processed by full-wave rectification bridge 124, for example, so that formation voltage signal 174 (, V
bulk).TRIAC dimmer 118 joins with comprising the light modulation Periodic correlation of connecting the period and turn-offing the period.During the connection period of TRIAC dimmer 118, the size of voltage signal 174 is approximately equal to AC input signal 121.During the shutoff period of TRIAC dimmer 118, voltage signal 174 has low size (for example, being approximately zero).Capacitor 150 (for example, C
1) for example, in response to voltage signal 174 (, V
bulk) for example, by resistor 138 (, R
3) be recharged, and for example, locate formation voltage signal 176 at terminal 112 (, terminal VCC).If voltage signal 176 surpasses under-voltage locking (UVLO, under-voltage-lock-out) threshold voltage, controller 102 is activated, and by terminal 116 (for example, terminal GATE) for example export modulation signal 178 (for example, pulse-width modulation (PWM) signal), with closed (, connecting) or (for example disconnect, turn-off) for the switch 152 of the routine operation of system 100 (for example, M2).Comprise resistor 130 (for example, R
2) and resistor 134 (for example, R
4) bleeder circuit at least for example, based on voltage signal 174 (, V
bulk) formation voltage signal 179.Controller 102 detection terminals 106 (for example, terminal V
s) signal 179 located, to affect power factor and to determine the state of TRIAC dimmer.
When controller 102 change modulation signals 178 with closed (for example, connecting) switch 152 (for example, in the time of M2), primary current 180 armature winding 162 of flowing through, and for example, by resistor 154 (, R
s) generation current sensing signal 188.The current sensing signal 188 that controller 102 detection terminals 120 (for example, terminal CS) are located.For example, the peak value of current sensing signal 188 for example affects signal 178, to drive (, turn-offing) switch 152 in each cycle interruption.Auxiliary current 182 is flowed through auxiliary winding 166 with for example, to capacitor 150 (, C
1) charging, and at auxiliary winding 166 place's formation voltage signals 184.Comprise resistor 146 (for example, R
5) and resistor 148 (for example, R
6) bleeder circuit at least based on voltage signal 184 formation voltage signals 186.Controller 102 for example, locates to receive signal 186 at terminal 114 (, terminal ZCD), to detect the end of the demagnetization process being associated with the transformer that comprises secondary winding 164.In addition, capacitor 170 is used to maintain output voltage so that stabling current is exported to LED172.During the connection period of TRIAC dimmer 118, mains switch 132 (for example, M1) disconnects (for example, turn-offing).During the shutoff period of TRIAC dimmer 118, mains switch 132 closures (for example, connect) with provide maintain electric current (bleeding current) thus TRIAC dimmer 118 is normally operated.
Fig. 2 is the simplification tradition diagram of the controller 102 shown in Fig. 1.Error amplifier, logic control assembly 206, grid driven unit 208, signal generator 210 (for example, pwm signal maker), the multiplier 212 that controller 102 comprises comparator 202, comprise comparator 204 and switch 205 and comprise error amplifier and assembly 214 is adjusted in the constant current of current detecting unit.For example, pwm signal maker is configured to generate one or more pulse-width signals.In another example, pwm signal maker comprises comparator.
As depicted in figs. 1 and 2, comparator 204 receives signals 179 and threshold signal 226 to detect the state of TRIAC dimmer 118, and exports dim signal 228.Thereby switch 205 is closed or disconnect brightness affect output current adjusting LED172 (for example, regulating linearly the brightness as the LED172 of the function of output current) in response to dim signal 228.Constant current at terminal 120 (is for example adjusted assembly 214, terminal CS) received current sensing signal 188 is with the peak value of detection of primary electric current 180, and in the demagnetization period being associated with transformer (comprising armature winding 162 and secondary winding 164) peak integration to primary current 180.Multiplier 212 receives from constant current and adjusts the treated signal 216 of assembly 214 and for example, from the voltage signal 179 of terminal 106 (, terminal VS), and generating output signal 218.
Signal generator 210 received current sensing signals 188 and output signal 218 also generate signal 220.During the operation cycle, for example, if modulation signal 178 is logic high and switch 152 closures (, connecting), the size of the primary current 180 of the switch 152 of flowing through increases.As response, the size of current sensing signal 188 increases.If the size of signal 188 becomes, be greater than output signal 218, signal generator 210 change signals 220 and controller 102 for example become logic low, to disconnect (, turn-offing) switch 152 by signal 178 from logic high.For example, when switch 152 disconnects (, turn-offing), comprise that the transformer of armature winding 162 and secondary winding 164 starts demagnetization process.
Comparator 202 receives signal 186 and whether threshold signal 222 completes to detect demagnetization process.If determine that demagnetization process completes, comparator 202 output signals 224 are to become logic high by signal 178.During the shutoff period of TRIAC dimmer 118, logic control assembly 206 output signals 230 with closed (for example, connecting) switch 132 (for example, M1), be provided for TRIAC dimmer 118 normal running maintain electric current.
Comprehensive above description and Fig. 1 and Fig. 2 are known, the basic principle of the brightness adjustment control of traditional LED illuminator of use TRIAC dimmer is: TRIAC dimmer 118 carries out switch adjusting to the AC input signal 121 from AC provisioning component 122 within the scope of certain angle, makes voltage signal 174 (V
bulk) size during the connection period of TRIAC dimmer 118, equal AC input signal 121, and be 0 level during the shutoff period of TRIAC dimmer 118.Controller 102 detects the state of TRIAC dimmer 118 by the voltage signal 179 from terminal 106, and generate corresponding dim signal 228 according to voltage signal 179, so that the error amplifier that comprises comparator 204 and switch 205 is controlled, thereby regulate the output current of illuminator 100, realize the brightness adjustment to LED.In addition, in order to maintain TRIAC dimmer 118, under off state, still can normally work and prevent the LED flicker bringing because of TRIAC dimmer 118 operation irregularities, controller 102 also generates will be by terminal 104 (for example, terminal TRIAC) output for controlling the disconnection of mains switch 132 and closed control signal, be provided for TRIAC dimmer 118 normal running maintain electric current.
Particularly, the output average current of the illuminator shown in Fig. 1 100 (that is, outputing to the electric current of LED172) is:
Wherein,
the light modulation phase angle that represents TRIAC dimmer 118, the armature winding 162 of N indication transformer U1 and the turn ratio of secondary winding 164, V
ref_earepresent the reference voltage that constant current adjustment assembly 214 is used when current sensing signal 188 is processed.
Illuminator 100 has some shortcomings.For example, when the light modulation phase angle of TRIAC dimmer 118 lower (for example, the conduction time of TRIAC dimmer 118 be less than TRIAC dimmer 118 operation time period 20%) or when ac input voltage is higher, user can feel the flicker of LED172.
Therefore, improve dimming control technique and become extremely important.
Summary of the invention
Problem in view of the above, the invention provides a kind of dimming control system and method for the TRIAC of use dimmer.As just example, the present invention has been applied to for driving the system of light-emitting diode (LED).But will recognize, the present invention has range of application widely.
The dimming control system of use TRIAC dimmer according to an embodiment of the invention, comprise: one or more signal processing components, be configured to receive the first signal being associated with TRIAC dimmer, according to the secondary signal of first signal generating digital impulse type, and secondary signal is sent to switch, thereby control with the closed or disconnection of control switch the electric current that outputs to light-emitting component.
The dimming control system of use TRIAC dimmer according to another embodiment of the invention, comprise: one or more signal processing components, be configured to receive the first signal being associated with TRIAC dimmer, according to the 3rd signal of first signal generating digital impulse type, according to the 3rd signal, the original reference voltage of dimming control system is regulated, to control the electric current that outputs to light-emitting component.
The dimming controlling method of use TRIAC dimmer according to an embodiment of the invention, comprising: receive the first signal being associated with TRIAC dimmer; According to the secondary signal of first signal generating digital impulse type; Secondary signal is sent to switch, thereby control with the closed or disconnection of control switch the electric current that outputs to light-emitting component.
The dimming controlling method of use TRIAC dimmer according to another embodiment of the invention, comprising: receive the first signal being associated with TRIAC dimmer; According to the 3rd signal of first signal generating digital impulse type; According to the 3rd signal, the original reference voltage of dimming control system is regulated, to control the electric current that outputs to light-emitting component.
Depend on embodiment, can obtain one or more benefits.With reference to the detailed description and the accompanying drawings below, can understand all sidedly these benefits of the present invention and each other object, feature and advantage.
Accompanying drawing explanation
Fig. 1 is the simplification diagram that traditional LED illuminator of using TRIAC dimmer is shown.
Fig. 2 is the simplification tradition diagram of the controller shown in Fig. 1.
Fig. 3 shows the controller 102-1 for the illuminator 100 shown in Fig. 1 according to the embodiment of the present invention.
Fig. 4 shows voltage signal 174 (for example, V
bulk) ideal waveform and the contrast of actual waveform.
Fig. 5 show by Digital Signal Processing assembly 301, realized for obtaining the schematic diagram of the method for stable output current.
Fig. 6 show by Digital Signal Processing assembly 301, realized for obtaining the flow chart of the method for stable output current.
Fig. 7 shows the light modulation phase angle of TRIAC dimmer 118 in the traditional TRIAC light modulation scheme shown in Fig. 1 and Fig. 2
with the relation that outputs to the electric current of LED.
Fig. 8 shows not only comprising Digital Signal Processing assembly 301 but also comprising the controller 102-2 of reference voltage modulation module 801 according to the embodiment of the present invention.
Fig. 9 shows the light modulation phase angle that adopts TRIAC dimmer 118 according to the controller 102-2 of the embodiment of the present invention
control outputs to the schematic diagram of the electric current of LED172.
Figure 10 shows the light modulation phase angle that adopts TRIAC dimmer 118 according to the controller 102-2 of the embodiment of the present invention
accurately control constant current and adjust the reference voltage V that assembly 214 is used
ref_easchematic diagram.
Figure 11 shows duty ratio and the reference voltage V of voltage control signal
ref-eabetween corresponding relation.
Figure 12 shows the exemplary circuit diagram of reference voltage modulation component 801.
Figure 13 shows the brightness of LED and outputs to the relation between the electric current of LED.
Figure 14 shows and a kind ofly solves brightness in the process of using above-described dimming control system and method to carry out light modulation and change inhomogeneous method.
Embodiment
The present invention relates to integrated circuit, relate more specifically to use dimming control system and the method for TRIAC dimmer.As just example, the present invention has been applied to drive the system of light-emitting diode (LED).But will recognize, the present invention has range of application widely.
The defect that the traditional LED illuminator of use TRIAC dimmer in view of the above exists, the invention provides a kind of dimming control system and method for use TRIAC dimmer of novelty.For convenient, by continuing dimming control system and the method according to the use TRIAC dimmer of the embodiment of the present invention in conjunction with 100 pairs of illuminators shown in Fig. 1, describe below.But, it should be appreciated by those skilled in the art that according to the dimming control system of the use TRIAC dimmer of the embodiment of the present invention and method be not to be only applied to the illuminator 100 shown in Fig. 1, but there is range of application widely.
Fig. 3 shows the controller 102-1 for the illuminator 100 shown in Fig. 1 according to the embodiment of the present invention.It should be noted that, the part except controller 102 and LED172 in the illuminator 100 shown in controller 102-1 and Fig. 1 has formed according to the dimming control system of the use TRIAC dimmer of the embodiment of the present invention.As shown in Figure 3, according to the controller 102-1 of the embodiment of the present invention, with Digital Signal Processing assembly 301, replace comparator 204 and the dim signal 228-1 of Digital Signal Processing assembly 301 outputs is guided to logic control assembly 206, for example, to the terminal 116 of controller 102-1 (to realize, terminal GATE) and terminal 104 (for example, terminal TRIAC) thus the adjusting of output voltage realize the flicker free work of LED.
Particularly, as shown in Figure 3, according to the controller 102-1 of the embodiment of the present invention, comprise comparator 202, Digital Signal Processing assembly 301, switch 205, logic control assembly 206, grid driven unit 208, signal generator 210 (for example, pwm signal maker), multiplier 212 and comprise error amplifier and the constant current of current detecting unit adjustment assembly 214.For example, pwm signal maker is configured to generate one or more pulse-width signals.In another example, pwm signal maker comprises comparator.
As shown in figures 1 and 3, Digital Signal Processing assembly 301 for example, at terminal 106 (, terminal VS) receiver voltage signal 179 state with detection TRIAC dimmer 118, and exports dim signal 228-1.Thereby switch 205 is closed or disconnect the brightness that regulates LED172 affect output current (for example, linearity or non-linearly regulate the brightness as the LED172 of the function of output current) in response to dim signal 228-1.Constant current at terminal 120 (is for example adjusted assembly 214, terminal CS) received current sensing signal 188 is with the peak value of detection of primary electric current 180, and in the demagnetization period being associated with transformer (comprising armature winding 162 and secondary winding 164) peak integration to primary current 180.Multiplier 212 receives from constant current and adjusts the treated signal 216 of assembly 214 and for example, from the voltage signal 179 of terminal 106 (, terminal VS), and generating output signal 218.
Signal generator 210 received current sensing signals 188 and output signal 218 also generate signal 220.During the operation cycle, for example, if modulation signal 178 is logic high and switch 152 closures (, connecting), the size of the primary current 180 of the switch 152 of flowing through increases.As response, the size of current sensing signal 188 increases.If the size of current sensing signal 188 becomes, be greater than output signal 218, signal generator 210 change signals 220 and controller 102 for example become logic low, to disconnect (, turn-offing) switch 152 by signal 178 from logic high.For example, when switch 152 disconnects (, turn-offing), comprise that the transformer of armature winding 162 and secondary winding 164 starts demagnetization process.
Comparator 202 receives signal 186 and whether threshold signal 222 completes to detect demagnetization process.If determine that demagnetization process completes, comparator 202 output signals 224 are to become logic high by signal 178.During the shutoff period of TRIAC dimmer 118, logic control assembly 206 output signals 230 with closed (for example, connecting) switch 132 (for example, M1), be provided for TRIAC dimmer 118 normal running maintain electric current.
Further, in the controller 102-1 shown in Fig. 3,301 pairs of Digital Signal Processing assemblies at terminal 106 (for example, terminal VS) voltage signal 179 receiving carries out analog/digital conversion, generate the digital pulse signal corresponding with the phase angle of voltage signal 179, then according to the dim signal 228-1 of this digital pulse signal generating digital impulse type.Dim signal 228-1 is directed to switch 205 and logic control assembly 206.Switch 205 is closed or disconnection in response to dim signal 228-1, thereby to produce stable output current, regulates the brightness of LED172.Logic control assembly 206 according to be received from the signal 224 of comparator 202, the dim signal 228-1 that is received from the signal 220 of signal generator 210 and is received from Digital Signal Processing assembly 301, with control switch 132 (for example generate signal 230, M1) closure (for example, connect) and (for example disconnect, turn-off), and correspondingly control the modulation signal 178 of grid driven unit 208 formation logic high level or logic low.
Because voltage signal 179 is for example, by comprising resistor 130 (, R
2) and resistor 134 (for example, R
4) bleeder circuit at least for example, based on voltage signal 174 (, V
bulk) generate, so voltage signal 179 has the cyclophysis identical with voltage signal 174.In addition, for example, due to voltage signal 174 (, V
bulk) be to generate by processing the AC input signal 121 of being processed from AC provisioning component 122 by TRIAC dimmer 118, so the phase angle of voltage signal 174 is consistent with the light modulation phase angle of TRIAC dimmer 118.Phase angle with regard to voltage signal 179 describes the impact of the brightness of LED172 (that is, the impact of the phase angle of voltage signal 174 on the brightness of LED172) below.
Fig. 4 shows voltage signal 174 (for example, V
bulk) ideal waveform and the contrast of actual waveform.In Fig. 4, V
bulk1the ideal waveform that represents voltage signal 174, V
bulk2the actual waveform that represents voltage signal 174, V
acexpression is from the waveform of the AC input signal 121 of AC provisioning component 122, V
tRIACrepresent that TRIAC dimmer 118 is by processing the waveform of the voltage signal 123 of AC input signal 121 generations.
In theory, during the connection period of TRIAC dimmer 118, voltage signal 174 (for example, V
bulk) voltage waveform be identical (V
bulk1show the ideal waveform of voltage signal 174).But in actual applications, because the characteristics of TRIAC dimmer 118 itself make the processing of the positive negative level of AC input signal 121 have difference to a certain degree, cause voltage signal 174 that AC input signal 121 generates after the full-wave rectification bridge 124 rectifications actual waveform in different cycles to have difference (V to a certain degree
bulk2show the actual waveform of voltage signal 174).This V
bulk2the difference of voltage waveform causes the electric current that outputs to LED172 to have larger difference the most at last, thereby produces the LED scintillation that human eye can perception.Because the brightness of LED172 is mainly determined by the electric current that outputs to LED, so work as the angle of flow of TRIAC dimmer 118 (, the periodic difference of electric current that can cause outputing to LED when light modulation phase angle) large is large, thereby Human Perception is glimmered to LED.That is to say, the inhomogeneous or large small echo phenomenon of the waveform of the voltage signal 174 causing because of the self-characteristic of TRIAC dimmer 118 is to cause that to output to the electric current of LED unstable, finally produces the main cause of LED flicker.
Reason in view of the generation LED flicker of analyzing in conjunction with Fig. 4, has proposed the controller 102-1 for the illuminator 100 shown in Fig. 1 according to the embodiment of the present invention.As shown in Figure 3, in one embodiment, by Digital Signal Processing assembly 301 is guided to logic control assembly 206 according to the dim signal 228-1 of the digit pulse type of voltage signal 179 generations, generate offer controller 102 terminal 116 (for example, terminal GATE) and terminal 104 (for example, terminal TRIAC) approximate uniform voltage signal, thus stable electric current provided for LED172.
Particularly, Fig. 5 show by Digital Signal Processing assembly 301, realized for obtaining the schematic diagram of the method for stable output current (that is, outputing to the electric current of LED172).In Fig. 5, V
bulkthe actual waveform (it has also reflected the actual waveform of voltage signal 179) that represents voltage signal 174, Phase representative digit signal processing component 301 is according to the waveform of the corresponding digital pulse signal in the phase angle with voltage signal 179 of voltage signal 179 generations, DIM representative digit signal processing component 301 is modulated the waveform of the dim signal 228-1 of the digit pulse type generating according to 179 couples of digital pulse signal Phase of voltage signal, TRIAC presentation logic control assembly 206 bases and signal 224, signal 220, and signal 228-1 generate by the terminal from controller 102-1 104 (for example, terminal TRIAC) waveform of the signal 230 of output.It should be noted that, because voltage signal 179 is for example, by comprising resistor 130 (, R
2) and resistor 134 (for example, R
4) bleeder circuit at least for example, based on voltage signal 174 (, V
bulk) generate, thereby voltage signal 179 has the waveform identical with voltage signal 174.
Fig. 6 show by Digital Signal Processing assembly 301, realized for obtaining the flow chart of the method for stable output current.Below in conjunction with Fig. 5 and Fig. 6, the concrete processing of digital signal processing component 301 is described.As shown in Figure 6, Digital Signal Processing assembly 301 in controller 102-1 carries out following processing: will be from terminal 106 (for example, terminal VS) voltage signal 179 of input carries out analog/digital conversion, generate the angle phi n (that is, execution step S602) in each cycle of the digital pulse signal Phase corresponding with the phase angle of voltage signal 179 recording voltage signal 179; The phase angle in continuous 4 cycles of voltage signal 179 (for example, φ n-3, φ n-2, φ n-1, φ n) compared and selects wherein minimum angle phi n_min (that is, execution step S604); The angle phi n+1 of the next cycle after the minimum angle phi n_min selecting and this continuous 4 cycles is compared to (that is, execution step S606); If φ n+1 is larger than φ n_min, the information that utilize to characterize φ n_min to digital pulse signal Phase modulate to generate characterize φ n_min dim signal 228-1 (, only use the part at the φ n_min phase angle in the one-period of voltage signal 179 to carry out brightness adjustment control, and remainder in this cycle does not participate in brightness adjustment control) (that is, execution step S608-1); If φ n+1 is less than φ n_min, the information that utilize to characterize φ n+1 modulates to generate the dim signal 228-1 (n+1 cycle of voltage signal 179 by all for brightness adjustment control) (that is, performing step S608-2) that characterizes φ n+1 to digital pulse signal Phase.
In one embodiment, Digital Signal Processing assembly 301 can utilize the first in first out that a length is 4 (FIFO) queue to complete above-described step S602 to S608-1/2 (that is, execution step S610), until controller shutdown.Particularly, for voltage signal 179, every 4 consecutive periods of Digital Signal Processing assembly 301 carry out phase angle size relatively and produce φ n_min, and in ensuing the 5th cycle, entering FIFO the 1st cycle simultaneously above leaves after FIFO, 4 new consecutive periods to the come in the 5th cycle and 2-4 cycle composition above judge processing, this process in time (cycle) increase is constantly carried out, until system closedown finishes.It should be noted that, the phase angle size of 4 consecutive periods is compared just illustrative, can be according to actual needs in concrete application the phase angle of continuous 2,3,5 or more consecutive periods be compared, to carry out subsequent treatment.
That is to say, being realized by Digital Signal Processing assembly 301 of describing in conjunction with Fig. 5 and Fig. 6 for obtaining the method for stable output current, by finding out successively minimum phase angle in a plurality of consecutive periods of voltage signal 179, generate the very little dim signal 228-1 of difference between the phase angle of different cycles, thereby obtain the basicly stable electric current that outputs to LED.This is because in the situation that the difference between the phase angle of the different cycles of dim signal 228-1 is very little, the difference outputing between the electric current of LED will become very little, thereby make LED can not produce the scintillation that human eye can perception.
When the traditional TRIAC light modulation scheme adopting shown in Fig. 1 and Fig. 2, owing to outputing to the electric current of LED172, meet equation 1, so work as the light modulation phase angle of TRIAC dimmer 118
enough hour, for example, owing to carrying out by TRIAC dimmer 118 being processed to the voltage signal 123 of AC input signal 121 generations voltage signal 174 (, the V that rectification processing generates
bulk) brownout, will cause the illuminator 100 shown in Fig. 1 and Fig. 2 cannot maintain the normal constant current of LED172 is controlled, the minimum size that makes to output to the electric current of LED172 is restricted.As shown in Figure 7, at the light modulation phase angle of TRIAC dimmer 118
be less than
after 0, the electric current that outputs to LED changes rapidly, causes the dimming resolution of illuminator 100 low.
In order to realize the high-resolution adjusting for the brightness of LED172, according to the dimming control system of the use TRIAC dimmer of the embodiment of the present invention, can further at controller 102-1, comprise reference voltage modulation module 801.Fig. 8 shows not only comprising Digital Signal Processing assembly 301 but also comprising the controller 102-2 of reference voltage modulation module 801 according to the embodiment of the present invention.In the controller 102-2 shown in Fig. 8, by the light modulation phase angle at TRIAC dimmer 118
little of still maintaining the stabling current that outputs to LED172
before 0, according to the light modulation phase angle of TRIAC dimmer 118
to output to the electric current of LED172 regulate to be reduced to enough little, to realize high-resolution brightness adjustment control (principle is as shown in Figure 9).
From above equation 1, the reference voltage V that is input to error amplifier that assembly 214 is used when current sensing signal 188 is processed is adjusted in constant current
ref_eacan affect the electric current that outputs to LED172.Therefore, according to the controller 102-2 of the embodiment of the present invention, will pass through according to the light modulation phase angle of TRIAC dimmer 118
regulate V
ref_easize realize high-resolution brightness adjustment control.As shown in Figure 8, reference voltage modulation component 801 is connected between Digital Signal Processing assembly 301 and constant current adjustment assembly 214.Particularly, reference voltage modulation component 801 (for example, Ctrl), and generates and is input to the reference voltage V that the error amplifier in assembly 214 is adjusted in constant current according to control signal 802 from Digital Signal Processing assembly 301 reception control signals 802
ref_ea.
Figure 10 shows the light modulation phase angle that controller 102-2 adopts TRIAC dimmer 118
accurately control inputs is adjusted the reference voltage V of the error amplifier in assembly 214 to constant current
ref_easchematic diagram.As shown in figure 10, V
ref0that the light modulation angle phi of TRIAC dimmer 118 is input to the reference voltage (be also referred to as original reference voltage below, for a fixing light adjusting system, this voltage is scheduled to) that the error amplifier in assembly 214 is adjusted in constant current when maximum; Along with φ reduces, V
ref-eaalso corresponding reducing, and at φ, be reduced to maintain before outputing to the required smallest angle+0 of the stabling current of LED172 and be reduced to 0.The electric current that outputs to LED due to the light modulation angle phi at TRIAC dimmer when the higher level can keep the normal work of LED and can not produce flicker, so this one-phase also can be to V
ref_earegulate.
Particularly, in the controller 102-2 shown in Fig. 8, Digital Signal Processing assembly 301 adopts pulse width modulation (PWM) method (that is, passing through digital duty cycle signal) accurately to control V
ref_easize.That is to say, Digital Signal Processing assembly 301 is according to the size of the light modulation angle phi of the TRAIC dimmer detecting by voltage signal 179, export the high-frequency digital signal (for example, the Ctrl in Fig. 8, i.e. control signal 802 above-mentioned) of certain duty ratio (duty); Reference voltage modulation component 801 is according to control signal 802 and original reference voltage V from Digital Signal Processing assembly 301
ref0, generate and be input to the reference voltage V that the error amplifier in assembly 214 is adjusted in constant current
ref_ea.Like this, can realize the duty ratio and the reference voltage V that is input to the error amplifier in constant current adjustment assembly 214 of control signal 802
ref-eathe correspondence of size.Figure 11 shows duty ratio and the reference voltage V of control signal 802
ref-eabetween corresponding relation.As shown in figure 11, control signal 802 (for example, the size of the light modulation angle phi of duty ratio Complete Characterization TRIAC dimmer 118 Ctrl).
Figure 12 shows the exemplary circuit diagram of reference voltage modulation component 801.As shown in figure 12, reference voltage modulation component 801 comprises operational amplifier OP1, simulation either-or switch K1 and capacitor C 1, wherein predetermined voltage V
ref0the buffer being connected into through operational amplifier OP1 outputs to one end of simulation either-or switch K1, another input end grounding of K1, and the output termination capacitor C 1 of K1, the voltage of capacitor C 1 is exactly V
ref_ea(voltage of capacitor C 1 is directed to the input of the error amplifier in constant current control assembly 214), the control signal of K1 is from the voltage control signal 802 of Digital Signal Processing assembly 301 (for example, Ctrl).The input signal gating of the voltage control signal 802 control simulation either-or switch K1 of digit pulse type.Particularly, when Ctrl is logical one, K1 gating OP1 output, i.e. V
ref0; When Ctrl is logical zero, K1 gating ground, i.e. 0V.After capacitor C 1 filtering, the average voltage Vref_ea of C1 can express with equation 2.
V
ref_ea=Duty * V
ref0(equation 2)
In addition, although the brightness of LED mainly by the electric current that outputs to LED, determined, output between LED electric current and LED brightness not linear dependence.As shown in figure 13, the brightness of LED and the relation outputing between the electric current of LED be, when the electric current that outputs to LED the brightness of hour LED change fast, and when output to the electric current of LED when larger the brightness of LED change slowly.So, more than using, in conjunction with dimming control system and the method for Fig. 1,3, the 8 use TRIAC dimmers of describing, carry out in the process of light modulation, there will be LED brightness is not the problem of even variation.Figure 14 shows and a kind ofly solves brightness in the process of using above-described dimming control system and method to carry out light modulation and change inhomogeneous method.Particularly, Digital Signal Processing assembly 301 can (for example generate control signal 802 according to the light modulation angle phi of TRIAC dimmer 118, Ctrl), time, make to produce non-linear relation and then make light modulation angle phi and reference voltage V between light modulation angle phi and control signal 802
ref-eabetween produce non-linear relation, make V
ref-eaor the curent change that outputs to LED also occurs this non-linearly, for the non-linear relation between compensation LED electric current and brightness, reach the effect of dotted line in Figure 14.
Other of digital processing assembly 301 in controller 102-2 are processed, the processing of the digital processing assembly 301 in controller 102-2 and other assemblies beyond reference voltage modulation component 801 and above identical with reference to figure 1 and Fig. 3 description.So, in order unnecessarily to obscure the present invention, be not repeated here.In addition, those skilled in the art should be understood that, above-describedly to outputing to the high-resolution adjusting of the electric current of LED172, process and also can be independent of the processing of the flicker free work that realizes LED172 and be carried out separately, this can't have influence on the work of other assemblies in controller.
Some or all of assemblies in each embodiment of the present invention individually and/or with another assembly at least combined be that one or more that utilize one or more component softwares, one or more nextport hardware component NextPort and/or software and nextport hardware component NextPort combine to realize.In another example, the some or all of assemblies in each embodiment of the present invention individually and/or with another assembly at least combined in one or more circuit, realize, for example in one or more analog circuits and/or one or more digital circuit, realize.In another example, each embodiment of the present invention and/or example can be combined.
Although described specific embodiments of the invention, yet it will be apparent to one skilled in the art that and be also present in other embodiment that described embodiment is equal to.Therefore, will understand, the restriction of specific embodiment shown in the present invention is not subject to, but only by the scope of claim, limited.
Claims (14)
1. a dimming control system that uses TRIAC dimmer, comprising:
One or more signal processing components, be configured to receive the first signal being associated with TRIAC dimmer, according to the secondary signal of described first signal generating digital impulse type, and described secondary signal is sent to switch, thereby to control the closed of described switch or to disconnect the electric current that control outputs to light-emitting component.
2. dimming control system according to claim 1, wherein, described one or more signal processing components are also configured to:
According to the 3rd signal of described first signal generating digital impulse type, according to described the 3rd signal, the original reference voltage of described dimming control system is regulated, to control the electric current that outputs to described light-emitting component.
3. dimming control system according to claim 1, wherein, described one or more signal processing components are further configured to:
Described first signal is carried out to analog/digital conversion, generate the 4th signal of the digit pulse type corresponding with the phase angle of described first signal;
Two or more consecutive periods of described first signal of take are unit, find out the minimum phase angle of described first signal in each unit;
Utilize the minimum phase angle in each unit finding out to modulate described the 4th signal, generate described secondary signal.
4. dimming control system according to claim 2, wherein, described one or more signal processing components are further configured to:
According to the phase angle information of described first signal, generate described the 3rd signal that has predetermined relationship between duty ratio and the phase angle of described first signal;
According to the duty cycle information of described the 3rd signal, the described original reference voltage of described dimming control system is regulated.
5., wherein, there is non-linear relation between described the 3rd duty ratio of signal and the phase angle of described first signal in dimming control system according to claim 4.
6. according to the dimming control system described in claim 3 or 4, wherein, described one or more signal processing components comprise Digital Signal Processing assembly, and wherein, the processing that generates described secondary signal and described the 3rd signal is carried out by described Digital Signal Processing assembly.
7. dimming control system according to claim 6, wherein, described one or more signal processing component comprises reference voltage modulation component, wherein, the processing according to the duty cycle information with described the 3rd signal correction connection, the described original reference voltage of described dimming control system being regulated is carried out by described reference voltage modulation component.
8. a dimming control system that uses TRIAC dimmer, comprising:
One or more signal processing components, be configured to receive the first signal being associated with TRIAC dimmer, according to the 3rd signal of described first signal generating digital impulse type, according to described the 3rd signal, the original reference voltage of described dimming control system is regulated, to control the electric current that outputs to light-emitting component.
9. a dimming controlling method that uses TRIAC dimmer, comprising:
Receive the first signal being associated with TRIAC dimmer;
According to the secondary signal of described first signal generating digital impulse type;
Described secondary signal is sent to switch, thereby to control the closed of described switch or to disconnect the electric current that control outputs to light-emitting component.
10. dimming controlling method according to claim 9, also comprises:
According to the 3rd signal of described first signal generating digital impulse type;
According to described the 3rd signal, the original reference voltage of dimming control system is regulated, to control the electric current that outputs to described light-emitting component.
11. dimming controlling methods of stating according to claim 9, wherein, the processing that generates described secondary signal comprises:
Described first signal is carried out to analog/digital conversion, generate the 4th signal of the digit pulse type corresponding with the phase angle of described first signal;
Two or more consecutive periods of described first signal of take are unit, find out the minimum phase angle of described first signal in each unit;
Utilize the minimum phase angle in each unit finding out to modulate described the 4th signal, generate described secondary signal.
12. dimming controlling methods according to claim 10, wherein,
According to the phase angle information being associated with described first signal, generate described the 3rd signal that has predetermined relationship between duty ratio and the phase angle of described first signal; And
According to the duty cycle information of described the 3rd signal correction connection, the described original reference voltage of described dimming control system being regulated.
, wherein, between described the 3rd duty ratio of signal and the phase angle of described first signal, there is non-linear relation in 13. dimming controlling methods according to claim 12.
14. 1 kinds of dimming controlling methods that use TRIAC dimmer, comprising:
Receive the first signal being associated with TRIAC dimmer;
According to the 3rd signal of described first signal generating digital impulse type;
According to described the 3rd signal, the original reference voltage of dimming control system is regulated, to control the electric current that outputs to light-emitting component.
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| CN201410322602.9A CN104066253B (en) | 2014-07-08 | 2014-07-08 | Use dimming control system and the method for TRIAC dimmer |
| TW103127620A TWI524818B (en) | 2014-07-08 | 2014-08-12 | Use the TRIAC dimmer dimming control system and method |
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Also Published As
| Publication number | Publication date |
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| TWI524818B (en) | 2016-03-01 |
| CN104066253B (en) | 2016-12-07 |
| TW201603644A (en) | 2016-01-16 |
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