CN106455216A - Silicon controlled rectifier dimming control system for LED brightness adjustment - Google Patents

Silicon controlled rectifier dimming control system for LED brightness adjustment Download PDF

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Publication number
CN106455216A
CN106455216A CN201610911500.XA CN201610911500A CN106455216A CN 106455216 A CN106455216 A CN 106455216A CN 201610911500 A CN201610911500 A CN 201610911500A CN 106455216 A CN106455216 A CN 106455216A
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output
angle
circuit
current
pmos
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CN106455216B (en
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常昌远
唐瑞
李振
洪潮
曹子轩
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Southeast University
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Southeast University
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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
    • 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]

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Abstract

A silicon controlled rectifier dimming control system for LED brightness adjustment is disclosed. A dimming control circuit is improved and optimized. Through introducing a conduction angle compensation technology, when a silicon controlled rectifier dimmer is adjusted to a largest conduction angle, an output current reaches a rated output current value. Through optimizing a dimming drop-down circuit parameter, when the silicon controlled rectifier dimmer is adjusted to a minimum conduction angle, an output current reaches a minimum value which is zero. Human eyes are not sensitive to heavy current LED illumination brightness changes and are sensitive to low current LED illumination brightness changes, based on that, a dimming curve is optimized, a two-segments dimming curve of rapid dimming and slow dimming is designed and two-segment dimming is realized. Through combining a corresponding PFC control circuit, basic requirements of a high power factor required by a basic LED driving circuit, low harmonic wave pollution, stable constant current output and the like are satisfied and simultaneously wide range adjusting can be performed on the LED illumination brightness according to the silicon controlled rectifier dimmer.

Description

A kind of thyristor regulating Optimizing Control System for LED luminance regulation
Technical field
The present invention relates to the brightness regulation technology of LED, and in particular to a kind of thyristor regulating for LED luminance regulation is light-operated System processed.
Background technology
LED (Light Emitting Diode) is with life-span length, low in energy consumption, brightness height, and multiple advantages such as small volume are The novel energy-conserving illuminating product of extensive concern, is described as " 21 century new light sources ".Compared with traditional electric filament lamp, LED lamp is only Need 1/10 energy consumption that identical luminosity is can achieve, and service life can extend hundreds of times.Day with LED technology research Benefit is ripe, and LED illumination replaces electric filament lamp, and traditional lighting system such as Halogen light is a kind of inexorable trend.
With deepening constantly and user's urgent needss under various circumstances to different light for energy-conserving and environment-protective concept, adjustable The illumination scheme of light is with its energy efficient, and brightness is adjustable, the characteristic such as control simplicity, is widely used in household, office, street lamp, dance The fields such as platform illumination.Light regulating technology is combined with LED illumination technology, will further decrease electric consumption on lighting, saves power consumption.In illumination In design, light modulation effect is given full play to, fully achieves the purpose of significantly energy-conservation.
In dimmer application field, controllable silicon light modulation has low cost, the advantages of practical, is initially widely used in white heat The adjusting control circuit of the purely resistive loads such as lamp.For the non-resistive load such as LED, LED luminance to be realized receives thyristor regulating Light device controls, and LED drive power need to carry out corresponding Design of Compatibility.Further, since the angle of flow of controllable silicon dimmer is limited, 0 ° to 180 ° of theoretical range of accommodation is unable to reach, thus limits its dimming scope.Therefore, LED dimming control system is not only Need to meet the compatibility with controllable silicon dimmer, while also needing to realize outstanding dimming behavior.
Content of the invention
The angle of flow due to controllable silicon dimmer is limited, and the range of accommodation for often leading to LED output current is restricted.For The High Power Factor for meeting needed for satisfaction basic LED drive circuit, low harmony wave pollution and stable constant current output etc. are required, While can be adjusted to LED luminosity according to controllable silicon dimmer.The present invention is by introducing angle of flow compensation technique so that When controllable silicon dimmer is adjusted to maximum conduction angle, output current reaches output-current rating value.By to dimming drop-down electricity The optimization of LUSHEN number so that when controllable silicon dimmer is adjusted to the minimum angle of flow, output current reaches minima.Pin of the present invention Insensitive to the change of high current LED luminosity to human eye, and the phenomenon to small current LED luminosity sensitive, design Quick light modulation and light modulation two-part light modulation at a slow speed, realize the dimming control system of wide tuning range two-part light modulation.
The concrete scheme that the present invention is adopted is as follows：A kind of thyristor regulating Optimizing Control System for LED luminance regulation, including By transformator, NMOS tube M1, former limit detection resistance RCSThe main topography module of inverse excitation type converter that constitutes with assists winding and can Control silicon dimmer, diode rectifier bridge, RCD absorbing circuit, it is characterised in that：Set up PFC constant current tandem circuit and brightness adjustment control Circuit, PFC constant current tandem circuit includes output current estimation circuit, output current control circuit and PFC logic control circuit, adjusts Light control circuit includes to turn on angle detection circuit, angle of flow compensation circuit and pull-down current control circuit；Controllable silicon dimmer pair Inlet highway voltage carries out copped wave process, after diode rectifier bridge, is on the one hand connected to transformer primary side winding anode and RCD One end of one end of resistance and electric capacity in absorbing circuit, the negative terminal of the other end connection diode of resistance and electric capacity, diode Anode connection primary side winding negative terminal and NMOS tube M1Drain terminal, NMOS tube M1Source through former limit detection resistance RCSGround connection, transformation Device vice-side winding negative terminal is through sustained diode0It is grounded after connection LED strip, output capacitance Co is connected in parallel on LED two ends, on the other hand, Diode rectifier circuit output is connected to conducting angle detection circuit, and angle of flow detection circuit output connects through angle of flow compensation circuit Pull-down current control circuit, pull-down current control circuit output connects output current control circuit, output current control circuit Output VCOMPOne input of connection PFC logic control circuit, at the same time, auxiliary winding feedback voltage FB equally connects Another input of PFC logic control circuit, PFC logic control circuit produces three outputs, an output connection NMOS tube M1Grid end, other two output signal TONAnd TOFFConnection output current estimation circuit, former limit detection resistance RCSWith NMOS tube M1Source The connection end at end also connects the input of output current estimation circuit, the output V of electric current estimation circuitCALConnection output current control Circuit processed；Wherein：
Output current estimation circuit is used for carrying out appraisal calculating to LED output current, including transmission gate T1, electric capacity C1、C2, Operational amplifier A mp1, resistance R1、R2And NMOS tube M2、M3、M4, former limit detection resistance RCSBoth end voltage is used as output current Estimation circuit input signal, former limit detection resistance RCSWith NMOS tube M1The connection end connection transmission gate T of source1Input, transmission Door T1The positive input terminal of outfan concatenation operation amplifier Amp1 through electric capacity C1Ground connection, operational amplifier A mp1 outfan connects NMOS tube M2Grid end, NMOS tube M2Drain terminal is through resistance R1Connection power vd D, NMOS tube M2Source is through resistance R2Ground connection, and feed back even It is connected to operational amplifier A mp1 negative input end, NMOS tube M2Source is also connected with NMOS tube M3Drain terminal, NMOS tube M3Pipe source connects NMOS tube M4Pipe drain terminal, NMOS tube M4Pipe source is grounded, NMOS tube M3Pipe and NMOS tube M4The grid end of pipe connects PFC logic respectively Output signal T of control circuitOFF、TON, NMOS tube M3 source is used as the output voltage signal V of output circuit estimation circuitCALAnd By electric capacity C2Ground connection；
Output current control circuit is according to the output voltage signal V of output current estimation circuitCALAnd pull-down current IpullControl Output current size processed, realizes system constant current and brightness adjustment control, and output current control circuit includes PMOS M5、M6, NMOS tube M7、M8, operational amplifier A mp2, Amp3, resistance R3、R4, PMOS M5、M6, NMOS tube M7、M8, PMOS M5And PMOS M6's Source connects power vd D, PMOS M5With PMOS M6Grid end interconnect and connect PMOS M5Pipe drain terminal and NMOS tube M7Leakage End, NMOS tube M7Source is through resistance R3Ground connection, and NMOS tube M7Source feedback link is transported to operational amplifier A mp2 negative input end Calculate amplifier Amp2 positive input terminal connection reference voltage VREF, PMOS M6Pipe drain terminal connects NMOS tube M8Drain terminal, NMOS tube M8Source End is through resistance R4Ground connection, and NMOS tube M8Source feedback link is to operational amplifier A mp3 negative input end, and operational amplifier A mp3 is just Input connects output current estimation circuit output signal VCAL, additionally, PMOS M6Drain terminal be simultaneously connected to pull-down current control The output of circuit processed；
PFC logic control circuit control system works in critical mode of operation BCM, and ensures in each switch periods, work( The ON time of rate metal-oxide-semiconductor is constant, so as to improve the power factor of system, PFC logic control circuit include comparator Comp1, Comp2, set-reset flip-floop, current source Icharge, electric capacity C3, switch S1And S2, power vd D is through switching S1 connection current source IchargeJust End, switchs S2With electric capacity C3Parallel connection, one end ground connection after parallel connection, the other end connection current source I after parallel connectionchargeNegative terminal, compares Device Comp2 positive input terminal connects current source IchargeNegative terminal, comparator Comp2 negative input end connects reference voltage VCOMP, comparator Output DRV_R controlling switch S of Comp22Conducting and shutoff, meanwhile, the output DRV_R of comparator Comp2 connection SR triggering Device R input, the positive input terminal ground connection of comparator Comp1, the negative input termination auxiliary winding feedback voltage of comparator Comp1 The S input of the output ZCD connection set-reset flip-floop of FB, comparator Comp1, set-reset flip-floop Q end exports DRV signal controlling switch S1 Conducting and shutoff；
Conducting angle detection circuit is used for processing the conducting angle information of controllable silicon dimmer and obtaining its angle of flow size, conducting Angle detection circuit includes divider resistance R5、R6, transmission gate T2、T3, comparator Comp3, phase inverter INV1, INV2, chopped rectification Busbar voltage TRIAC afterwards inputs to conducting angle detection circuit, through resistance R5、R6Partial pressure, resistance R5With R6Connection end connection ratio Compared with device Comp3 positive input terminal, reference voltage is through transmission gate T2、T3Connect the negative input end of comparator Comp3, comparator Comp3 afterwards The inverted device INV1 of comparative result TR1 export TR2 signal, export TRI signal after the inverted device INV2 of TR2 signal, TRI letter Number be turn on angle detection circuit output signal, TR1 and TR2 controlling transmission door T2、T3Conducting；
Angle of flow compensation circuit is reached not with solving the controllable silicon dimmer angle of flow by carrying out extra compensation to the angle of flow The output current for causing to 100% is unable to reach the defect of maximum output current, and angle of flow compensation circuit includes PMOS M9、 M10、M11、M12、M13、M14、M15, NMOS tube M16、M17, transmission gate T4, electric capacity C4、C5, operational amplifier A mp4, resistance R7、R8、 R9, comparator Comp4 and nor gate NOR1, PMOS M9Grid end and PMOS M10Grid end interconnection and with PMOS M11Drain terminal and PMOS M13Source connects, PMOS M11Grid end and M12Pipe grid end interconnection and with PMOS M13Grid end, PMOS M14Grid end, PMOS M15Grid end and PMOS M14Drain terminal and PMOS M15Source links together, PMOS M15Drain terminal is grounded, PMOS M13Pipe drain terminal connects PMOS M14Pipe source, PMOS M10Drain terminal connects PMOS M12Pipe source, PMOS M12Pipe drain terminal is even Meet transmission gate T4Input, electric capacity C4One end, comparator Comp4 negative input end and NMOS tube M16Drain terminal, NMOS tube M16Source Ground connection, NMOS tube M16Grid end connects reset signal, electric capacity C4The other end is grounded, transmission gate T4Output concatenation operation amplifier Amp4 Positive input terminal and electric capacity C5One end, electric capacity C5The other end is grounded, and operational amplifier A mp4 negative input end connects NMOS tube M17Source And resistance R8One end, resistance R8The other end connects resistance R9One end and comparator Comp4 positive input terminal, resistance R9The other end is grounded, One input of comparator Comp4 output connection nor gate NOR1, another input connection angle of flow of nor gate NOR1 The output signal of output TRI, the nor gate NOR1 of detection circuit is the output signal of angle of flow compensation circuit
Pull-down current control circuit is exported by specified pull-down current and pull-down current duty cycle control signal co- controlling Size of current, control pull-down current size is realized when pull-down current is constant, and control output current meansigma methodss keep constant, when leading Current flow angle changes, and during pull-down current change, output current meansigma methodss change, and reaches LED luminance regulation, pull-down current control electricity Road includes to switch S3, operational amplifier A mp5, NMOS tube M18, resistance RP.Output current control circuit PMOS M6Drain terminal is through switch S3Connection M18Pipe drain terminal, M18Pipe source is through resistance RPGround connection, amplifier Amp5 output connection M18Pipe grid end.M18Pipe source feedback is even It is connected to the negative input end of amplifier Amp5.The positive input terminal connection reference voltage V of amplifier Amp5REF, the output of angle of flow compensation circuit Signal-controlled switch S3Conducting and shutoff.
The main topography module of inverse excitation type converter, controllable silicon dimmer, diode rectifier bridge, RCD absorbing circuit is all using becoming Ripe known circuit structure.
On the basis of above-mentioned angle of flow compensation circuit, set up the angle of flow switching reference circuit and angle of flow switching circuit simultaneously Mate improved pull-down current control circuit, the two-part light modulation of wide tuning range is realized, in whole angle of flow excursion, The luminosity of LED can be judged and compared with reference standard according to the conducting angle information for detecting than more uniform change Relatively, when angle information being turned on more than reference value so that flow through the change of LED output current comparatively fast, dimmed using quick, work as the angle of flow During less than reference value so that it is relatively slow to flow through the change of LED output current, using dimming at a slow speed.
Angle of flow switching reference circuit includes PMOS M19、M20、M21、M22、M23、M24、M25, NMOS tube M26、M27, transmission Door T5, electric capacity C6、C7, operational amplifier A mp6, resistance R10、R11、R12And comparator Comp5, PMOS M19Grid end and PMOS Pipe M20Grid end interconnection and with PMOS M21Drain terminal and PMOS M23Source connects, PMOS M21Grid end and M22Pipe grid end is interconnected simultaneously With PMOS M23Grid end, PMOS M24Grid end, PMOS M25Grid end and PMOS M24Drain terminal and PMOS M25Source connects Together, PMOS M25Drain terminal is grounded, PMOS M23Pipe drain terminal connects PMOS M24Pipe source, PMOS M20Drain terminal connects PMOS M22Pipe source, PMOS M22Pipe drain terminal connects transmission gate T5Input, electric capacity C6One end, comparator Comp6 negative input End and NMOS tube M26Drain terminal, NMOS tube M26Source is grounded, NMOS tube M26Grid end connects reset signal, electric capacity C6Another termination Ground, transmission gate T5Output concatenation operation amplifier Amp6 positive input terminal and electric capacity C7One end, electric capacity C7The other end is grounded, and computing is put Big device Amp6 negative input end connection NMOS tube M27Source and resistance R11One end, resistance R11The other end connects resistance R12One end and ratio Compared with device Comp5 positive input terminal, resistance R12The other end is grounded, and comparator Comp5 output is the defeated of angle of flow switching reference circuit Go out signal TRI_REF, foregoing circuit structure is essentially identical with angle of flow compensation circuit, simply eliminates in angle of flow compensation circuit Nor gate NOR1.
Angle of flow switching circuit includes d type flip flop, phase inverter INV3, two inputs and door AND1, AND2, two input OR gates OR1, angle of flow switching reference circuit output TRI_REF connection d type flip flop input, turn on the output signal of angle detection circuit The inverted device INV3 of TRI is connected to d type flip flop clock end and is connected to an input of two inputs and door AND2, d type flip flop Two input of output Q connection and another input of door AND2, two inputs are connected two and are input into OR gate OR1 with the output of door AND2 An input, an input of non-two input of end connection of the output Q of d type flip flop and door AND1, angle of flow compensation circuit Output signalTwo input of connection and another input of door AND1, two inputs are connected two with the output of door AND1 Another input of input OR gate OR1, two input OR gate OR1 output signals TRI_P, the non-end output signal of Q of d type flip flop TRI_C.
Pull-down current control circuit after improvement includes to switch S4, pull-down current branch road Ipull1, pull-down current branch road Ipull2, Switch S4Pull-down current branch road I is gated under the control of angle of flow switching circuit output signal TRI_Cpull1Or pull-down current branch road Ipull2, correspond to the quick light modulation in two-part light modulation respectively and dim at a slow speed, pull-down current branch road Ipull1With Ipull2Circuit structure Identical, including operational amplifier A mp7, NMOS tube M28, resistance RP1With switch S5, output current control circuit PMOS M6Drain terminal Through switching S5Connection NMOS tube M28Drain terminal, NMOS tube M28Source is through resistance RP1Ground connection, NMOS tube M28Source also feedback link is to fortune Calculate the negative input end of amplifier Amp7, the positive input terminal connection reference voltage V of operational amplifier A mp7REF, operational amplifier A mp7 Output connection NMOS tube M28Grid end, output signal TRI_P controlling switch S of angle of flow switching circuit5Conducting and shutoff.
The dimming process of thyristor regulating Optimizing Control System is as follows：
1) conducting angle detection circuit is obtained controlled to the busbar voltage TRIAC signal after controllable silicon dimmer shaping Silicon turns on angle information TRI；
2) angle of flow switching reference circuit produces the angle of flow and judges reference standard, turn on angle detection circuit output signal and The angle of flow judges that reference standard compares；
3) comparative result of reference standard is judged according to conducting angle information and the angle of flow, gates the slow-action of two ends formula light modulation Light or quick light modulation；
4) quick light modulation is chosen, the conducting angle signal for detecting is increased by 25% dutycycle and negates, as under light modulation The control signal of puller circuit, the specified pull-down current for dimming pull-down circuit is reference current IREF2.5 times；
5) choose and dim at a slow speed, the conducting angle signal for detecting is negated, directly control pull-down current control circuit, drop-down The specified pull-down current of current circuit is reference current IREF1.25 times；
6) pull-down current control circuit and output current control circuit are guaranteed when pull-down current control signal is constant, output Current constant；During the change of pull-down current control signal, control output current change, realize LED luminance regulation.
Advantages of the present invention and useful achievement：
1) present invention passes through PFC (PFC), the mode such as output current control, it is ensured that LED drive circuit meets High Power Factor, low harmonics distortion and stable constant current output etc. are required.
2) present invention realizes LED luminance wide scope adjustable by carrying out additional compensation to thyristor operating angle.Work as controllable silicon When the angle of flow reaches maximum, flow through LED current and reach rated maximum current value；When thyristor operating angle reaches minima, Flow through LED current and reach minima.
3) present invention by dimming curve segmentation realize, and according to controllable silicon dimmer angle of flow size, to quick Light modulation is reasonably switched with light modulation at a slow speed, is realized in the range of accommodation of whole light modulation angle, and the luminosity of LED is relatively Uniform change.
4) circuit structure of the present invention is simple, it is easy to control, and low manufacture cost, thus with very high engineering Practical value.
Description of the drawings
Fig. 1 is the thyristor regulating Optimizing Control System schematic diagram that the present invention is adjusted for LED luminance；
Fig. 2 is output current estimation circuit schematic diagram of the present invention；
Fig. 3 is output current control circuit schematic diagram of the present invention；
Fig. 4 is PFC logic control circuit schematic diagram of the present invention；
Fig. 5 is the angle of flow of the present invention detection circuit theory diagrams；
Fig. 6 is angle of flow compensation circuit schematic diagram of the present invention；
Fig. 7 is present invention light modulation pull-down current control circuit schematic diagram；
Fig. 8 is present invention compensation controllable silicon dimmer angle of flow dimming effect figure；
Fig. 9 is two-part dimming effect figure of the present invention；
Figure 10 is two-part dimming curve parameter setting figure of the present invention；
Figure 11 is the angle of flow of the present invention switching reference signal circuit schematic diagram；
Figure 12 is angle of flow switching circuit schematic diagram of the present invention；
Figure 13 is two-part of the present invention light modulation pull-down current control circuit schematic diagram；
Figure 14 is present invention dimming curve characteristic under different input voltages.
Specific embodiment
Referring to Fig. 1, thyristor regulating Optimizing Control System of the present invention, including by transformator, NMOS tube M1, former limit detection resistance RCS Electricity is absorbed with the main topography module of the inverse excitation type converter of assists winding composition and controllable silicon dimmer, diode rectifier bridge, RCD Road, it is characterised in that：PFC constant current tandem circuit and adjusting control circuit is set up, PFC constant current tandem circuit includes that output current is estimated Circuit, output current control circuit and PFC logic control circuit is calculated, adjusting control circuit includes to turn on angle detection circuit, conducting Angle compensation circuit and pull-down current control circuit；Controllable silicon dimmer carries out copped wave process to inlet highway voltage, through diode After rectifier bridge, one end of resistance and one end of electric capacity in transformer primary side winding anode and RCD absorbing circuit is on the one hand connected to, The negative terminal of the other end connection diode of resistance and electric capacity, the anode connection primary side winding negative terminal of diode and NMOS tube M1Leakage End, NMOS tube M1Source through former limit detection resistance RCSGround connection, transformer secondary winding negative terminal is through sustained diode0Connection LED It is grounded after string, output capacitance Co is connected in parallel on LED two ends, on the other hand, diode rectifier circuit output is connected to angle of flow detection Circuit, angle of flow detection circuit output connects pull-down current control circuit, pull-down current control circuit through angle of flow compensation circuit Output connection output current control circuit, the output V of output current control circuitCOMPOne of connection PFC logic control circuit Input, at the same time, auxiliary winding feedback voltage FB equally connects another input of PFC logic control circuit, and PFC is patrolled Collect control circuit and produce three outputs, output connection NMOS tube M1Grid end, other two output signal TONAnd TOFFConnection is defeated Go out electric current estimation circuit, former limit detection resistance RCSWith NMOS tube M1The connection end of source also connects the defeated of output current estimation circuit Enter end, the output V of electric current estimation circuitCALConnection output current control circuit.
Referring to Fig. 2, output current estimation circuit includes the sampling hold circuit being made up of transmission gate and electric capacity, is put by computing Big device, MOSFET, the estimation circuit that resistance is constituted.After output current estimation circuit, output current IOUTEstimate with output current Linear relationship is set up between the output signal of circuit.The output signal of control output current estimation circuit, you can to output current It is controlled.CS is the main topology power metal-oxide-semiconductor source of connection, RCSFor former limit sampling resistor, TONFor NMOS tube M1Switch periods ON time, TOFFFor the corresponding turn-off time.In NMOS tube M1Switch periods in, work as M1During conducting, transformer primary side Electric current linear rise by zero, the voltage on former limit sampling resistor remains to electric capacity C by transmission gate1On；Work as M1During shutoff, VCS_SHThe crest voltage on former limit sampling resistor is kept, until switching tube is turned on next time.VCS_CABy a voltage follower Follow VCS_SHVoltage waveform.VCS_CASignal receives T respectively by twoON, TOFFThe switch of control enters row operation, and through electric capacity C2 After keeping filtering, output signal V is obtainedCAL.
By two metal-oxide-semiconductors being controlled with the turn-off time by ON time and filter capacitor C2So that VCAL, meet formula (1).
Wherein, VCS_PFor in the single switch cycle, the peak value of former limit sample rate current, TOFFFor switching tube turn-off time, TONFor Switching tube ON time.Fly-back converter circuit according to primary side feedback control show that output current meets formula (2).
Wherein, N is transformer primary side secondary turn ratio, ICS_PFor former limit peak point current, RCSFor former limit sampling resistor.In conjunction with Formula (1), (2) can draw formula (3).
Because of transformer primary side secondary turn ratio N and former limit sampling resistor RCSRatio N/RCSFor a fixed constant.Thus may be used , output current IOUTLinear relationship is set up and the output voltage signal of output current estimation circuit between, to VCALControlled System, as to output current IOUTIt is controlled.
Referring to Fig. 3, output current control circuit includes the Voltage to current transducer electricity that operational amplifier, NMOS and resistance are constituted Road and PMOS current mirroring circuit.By 1:The reference current of reference current branch road is accurately reproduced to defeated by 1 PMOS current mirror Out branch.On output current branch road, output current, pull-down current and reference current meet Kirchhoff's current law (KCL).Logical Cross the voltage control signal control output current size that pull-down current and output current estimation circuit are produced.By 1:1 PMOS Current mirror is by the reference current exact copies of left branch to right branch.In right branch, the external larger compensation of COMP foot Electric capacity so that in the case that system mode is stable, COMP voltage keeps relative constancy.In the Voltage to current transducer branch road of left side, VREFFor chip internal reference voltage, by operational amplifier, the voltage-current converter circuit that NMOS and voltage R is constituted, form phase The reference current I for answeringREF=VREF/R3；In the same manner, in right side Voltage to current transducer branch road, I2=VCAL/R4, VCALEstimate for output current Calculate circuit output signal, I2Characterize the size of output current.Electric current IpullFor the light modulation pull-down current of dimming controlling module, which is big The little Duty ratio control by dimming control signal TRI_P.
IREF, I2, IpullMeet Kirchhoff's current law (KCL) so that three's electric current meets formula (4).
IREF=I2+Ipull(4)
By the control of prime output current estimation circuit, VCALMeet formula (5).
Wherein RCSFor former limit sampling resistor, N is transformer primary side secondary turn ratio, IOUTFor output current, VCALFor output Electric current estimation circuit output.In conjunction with the principle of voltage-current converter circuit, electric current I2Meet formula (6).
Wherein, R4For output current control circuit transfer resistance, VCALFor output current estimation circuit output, I2For output Current control circuit right branch electric current.
Convolution (4), (5), (6) understand that releasing output current meets formula (7)
In formula (7), IOUTFor output current, IREFFor reference current, IpullFor dimming pull-down current, RCSFor former limit sampling electricity Resistance, N is transformer primary side secondary turn ratio, R4For output current control circuit transfer resistance, (N*R4)/RCSFor constant constant.
It follows that under the conditions of circuit devcie parameter determination, the size of output current is only big with light modulation pull-down current Little relevant, output current reduces with the increase of light modulation electric current.In the case that light modulation pull-down current keeps constant, output electricity Stream keeps constant.Dim drop-down control electric current IpullControlled by controlled silicon conducting angle signal TRI, and then led by controlling controllable silicon Current flow angle, changes IpullThe size of electric current, so as to adjust LED current, realizes LED luminance regulation.When not adjusting controllable silicon dimmer When, conducting angle signal keeps constant, and light modulation pull-down current keeps constant, and output current keeps constant.
Work under BCM pattern referring to Fig. 4, PFC logic control circuit control system, and ensure in each switch periods, The ON time of power MOS pipe is constant, so as to improve system power factor.PFC logic control circuit is included by electric capacity charge and discharge The saw-tooth wave generating circuit of electric forming, two comparators and RS latch.RS latch is the dominant latch of reset signal, Work as S, R at the same effectively when output with R effective when calculate, that is, when working as S=1, R=1, export Q=0.PFC logic control circuit profit With the main topology primary side current of transformer rate of rise and the proportional relation of line voltage, by the fixing ON time of switching tube, real The peak envelope of existing primary current assumes sinuso sine protractor, realizes High Power Factor.
PFC logic control circuit processes the voltage FB in assists winding in topological structure, exports M1The switch of pipe is adjusted Signal DRV processed.When DRV is for high level, IchargeElectric current is to electric capacity C3Charge, capacitance voltage is risen with fixed slope；Work as electric capacity Voltage rises to VCOMPDuring voltage, DRV_R signal is high level, electric capacity C3On voltage resetted.When DRV_R signal is effective, S/R latch output low level, DRV=0, power MOS pipe is not turned on.M1Pipe is not turned on causing transformer secondary winding with certain Voltage consumption transformator energy storage, when energy storage exhausts, assists winding terminal voltage drastically drops to negative value, FB signal and zero level Signal is compared so that ZCD signal becomes high level, namely S=1, so that output Q=1, the M of S/R latch1Guan Chong New unlatching.So circulate, control system is operated in BCM mode of operation, and works as VCOMPWhen voltage keeps constant, due on sawtooth waveforms The liter slope moment is consistent, and the high level time so as to control DRV is consistent.Using the primary side current of transformer rate of rise The relation proportional with line voltage, is fixed by the ON time of fixing switching tube, and the peak envelope for realizing primary current is presented Go out sinuso sine protractor and realize higher power factor.
Referring to Fig. 5, angle of flow detection line voltage of the processing of circuit after controllable silicon dimmer copped wave simultaneously obtains its angle of flow Information.Conducting angle detection circuit includes divider resistance, transmission gate, comparator and phase inverter.The input of conducting angle detection circuit Signal is the line voltage i.e. TRIAC voltage after controllable silicon copped wave, TRIAC voltage after electric resistance partial pressure with reference voltage through than Compared with device relatively after, inverted device exports controlled silicon conducting angle information TRI.Angle of flow detection electric circuit inspection is after controllable silicon copped wave Line voltage (TRIAC voltage) turns on angle information higher than the phase width of zero level so as to obtain controllable silicon dimmer.By TRIAC High-voltage signal is compared with low level voltage 0.15V after resistance ratio partial pressure, draws the current of controllable silicon dimmer Conduction phase；On the other hand, in order to shield impact of the level shake to detection accuracy, slow using the window of 0.15V～0.35V Stagnant comparator.
When V+ voltage is higher than 0.15V, comparator exports high level, and it is low level that TR1 is high level, TR2, and V- is selected 0.35V voltage, TRI exports high level；When V+ level is less than 0.15V, comparator exports zero level, and TR1 is low level, TR2 For high level, TRI output zero level.It follows that during V+ voltage is higher than zero level, TRI exports high level, otherwise then defeated Go out zero level.After angle of flow detection processing of circuit, TRI signal can reflect the phase place of TRIAC voltage signal, that is, reflecting can The conducting angle information of control silicon dimmer.
Angle of flow compensation scheme is introduced in the present invention, so as to improve the tune being limited and caused by the controllable silicon dimmer angle of flow The limited problem of optical range.DMINFor the dimmer minimum angle of flow, DMAXFor dimmer maximum conduction angle.The introducing of compensation scheme, So that when the angle of flow is in maximum, output current reaches rated value；When the angle of flow is in minima, output current reaches minimum Value.In this way, the full dose process control of output current in the range of accommodation of limited controllable silicon dimmer, can be realized.Different The maximum of the dimmer of controllable silicon dimmer manufacturer production and the minimum angle of flow disunity, it is however generally that, maximum conducting Angle is 75%, and it 20%, is to enable the compatible major part controllable silicon dimmer of the design chip that the minimum angle of flow is, all can be in light modulation Full scale light modulation is realized in the range of accommodation of device, in the design process, makes DMAX=75%, DMIN=20%.
Referring to Fig. 6, angle of flow compensation circuit is to improve the core circuit of thyristor regulating optical range, by carrying out to the angle of flow Extra compensation, to solve to be unable to reach maximum output because of the output current that thyristor operating angle can not reach 100% and cause The defect of current value.Angle of flow compensation circuit includes PMOS current mirror, sampling/holding that transmission gate is constituted with voltage follower Circuit, comparator, nor gate, monostable flipflop, NMOS tube and electric capacity etc..PMOS current mirroring circuit is filled to electric capacity Electricity, the sampling hold circuit being made up of transmission gate and voltage follower carries out sampling processing to the both end voltage of charging capacitor. Sampling processing output and output result of the charging capacitor voltage after comparator and controlled silicon conducting angle information TRI through nor gate at Reason produces compensation circuit output.NMOS tube realizes capacitance voltage reset under reset signal control.In the design, thyristor regulating is made Maximum conduction angle D of light deviceMAX=75%, that is, when the angle of flow is detected more than 75%, carrying out additionally to turning on angle signal The compensation of 25% dutycycle after, angle of flow dutycycle after forced compensation is that 100% so that output current reaches maximum output electricity Stream, improves the brightness regulation scope of output current.In angle of flow compensation circuit, left side IchargeElectric current is constituted through PMOS Current mirror is to electric capacity VCCharge, the sampling hold circuit being made up of transmission gate and voltage follower enters to charging capacitor both end voltage Row sampling processing.NMOS tube when Reset signal is effective, to VCVoltage is resetted.TRI signal through monostable flipflop, Of short duration pulse signal Sample is obtained in the trailing edge triggering of TRI.Sample signal through monostable flipflop, in Sample The trailing edge triggering of signal obtains of short duration pulse signal Reset.Sample and Reset signal is used for controlling sampling and resets.
In angle of flow compensation circuit, IchargeElectric current is charged for electric capacity, during charging, VCVoltage is constantly raised, Until Reset signal is effective so that VCVoltage amplitude is zero.Before Reset voltage is effective, first so that Sample is effective, by VC The maximum of voltage is stored to sampling/holding module, obtains crest voltage VCP.VCPFor VCOn crest voltage, through overvoltage with With device and 3:After 1 resistance ratio partial pressure, V is obtainedCPThe a quarter of voltage.VCPThe a quarter of voltage and VCVoltage ratio Relatively, its comparative result carries out NOT-AND operation with TRI, obtainsDutycycle is the increase of TRI dutycycle After 25% and the result that negates.The signal is through turning on the output signal after angle compensation.
Referring to Fig. 7, dim pull-down current control circuit and light modulation pull-down current is produced, change output current size, it is ensured that When controllable silicon dimmer is adjusted to maximum conduction angle, output current reaches maximum.Adjust in controllable silicon dimmer and lead to minimum During current flow angle, output current reaches minima.Light modulation pull-down circuit control circuit is exported different average according to the different angles of flow Pull-down current, to realize the regulation to output current.Pull-down current control circuit includes operational amplifier and MOSFET composition Voltage follower, dimming resistor.The output signal control MOSFET drain terminal switch of angle of flow compensation circuit, MOSFET source connects Dimming resistor, dimming resistor both end voltage feeds back to amplifier negative input end, and amplifier positive input terminal connection control pull-down circuit is specified The reference voltage of pull-down current.MOSFET drain-source current is the pull-down current under the control of pull-down current control circuit.Under light modulation The operational amplifier of sourcing current control circuit constitutes voltage follower structure, R with MOSFETpFor dimming pull down resistor, VREFFor control The reference point voltage of the specified pull-down current of pull-down circuit processed,For pull-down circuit duty cycle control signal, IpullFor reality The average pull-down current value for flowing through.Wherein, specified pull-down current value is VREF/Rp, typically, it is reference to make specified pull-down current value Electric current IREFK times, by adjusting different resistance RpCorresponded from different K values.
The meansigma methodss of pull-down current are by specified pull-down current and pull-down current duty cycle control signal co- controlling, and which is big Little as shown in formula (9).
When TRI signal dutyfactor is more than 75% more than 75%, the i.e. angle of flow, TRI signal is controlled after overcompensation The duty cycle control signal of pull-down current maintains low level always, so when, pull-down current is zero, according to the constant current original of system Reason, now, output current reaches maximum.
When TRI signal dutyfactor is less than 75% more than 20%, IpullElectric current is subject to specified pull-down current and pull-down current Duty cycle control signal controls, and according to the different angles of flow, exports different average pull-down currents, meets system constant current principle, To realize the regulation to output current.
When TRI signal dutyfactor is less than 20%, it is desirable to which now output current is zero, namely average pull-down current now Equal to reference current.TRI signal is still necessary to be maintained at controllable silicon dimmer and leads in minimum after increasing by 25% dutycycle The output current that causes of current flow angle is zero.Then, when dimmer is adjusted to the minimum angle of flow, meet formula (10).
IREF=K IREF(1- (20%+25%)) (10)
In formula (10), IREFFor reference current, K IREFFor dimming the specified pull-down current value of pull-down current, on the right of equation For average pull-down current, the equation left side is reference current, to draw K=1.78.
Therefore when the specified pull-down current of pull-down circuit is reference current IREF1.78 times when, when the angle of flow be equal to 20% when, Output current is zero, and when the angle of flow is less than 20%, output current is still zero, meets design object.
Referring to Fig. 8, the present invention is as shown in Figure 8 through turning on the dimming effect schematic diagram after angle compensation.Work as controllable silicon dimmer The angle of flow reach maximum DMAXWhen, output current reaches rated value；When the angle of flow of controllable silicon dimmer reaches minima DMINWhen, output current reaches minima；In the range of accommodation of limited controllable silicon dimmer, output current gamut is realized Control.
Angle of flow compensation circuit is optimized, two-part dimming arrangement is proposed, that is, is realized when the angle of flow is big so that stream Cross LED current change very fast, quick regulation is carried out, in angle of flow hour so that flow through LED current change relatively slowly, carry out at a slow speed Adjust.
Referring to Fig. 9, two-part dimming effect schematic diagram is as shown in Figure 9.By guarantee adjusting control circuit, market is sold greatly The compatibility of part controllable silicon dimmer, still ensures to determine its maximum conduction angle DMAX, minimum angle of flow DMINRespectively 75% with 20%.When the angle of flow is between 50%-75%, LED current quick regulation is realized；When the angle of flow is in 20%-50%, realize LED current is adjusted at a slow speed.Change for ensureing the electric current and thyristor regulating optic angle that in whole light modulation brightness, flow through LED keeps Monotonicity, determine quickly with the point of intersection for adjusting at a slow speed, flow through LED current and be consistent, i.e., when the angle of flow be 50% when, stream Cross that LED current is its rated current 37.5%.
Referring in Figure 10, two-part dimming curve parameter setting figure is as shown in Figure 10.Abscissa is led for controllable silicon dimmer Current flow angle D, vertical coordinate is to flow through the ratio that LED current accounts for LED rated current, i.e. IOUT/IRC.Straight line l1For quick dimming curve, mistake Point (35%, 0%), (50%, 37.5%) and (75%, 100%), its linear equation is represented by formula (11).Straight line l2For slow Velocity modulation light curve, crosses point (20%, 0%), (50%, 37.5%) and (100%, 100%), and its linear equation is represented by formula (12).
l1=2.5D-0.875；(0.5 ＜ D ＜ 0.75) (11)
l2=1.25D-0.25；(0.2 ＜ D ＜ 0.5) (12)
Formula (11), formula (12) are arranged, is drawn the relation such as formula between LED output current and thyristor operating angle (13) shown in.
In formula (13), IOUT1The output current of LED, I is flow through during for the angle of flow between 0.5～0.75OUT2Exist for the angle of flow The output current of LED, I is flow through when between 0.2～0.5RCFor output-current rating.Close between output current and thyristor operating angle System is as shown in formula (14).
In formula (14), IOUTFor angle being dimmed 0～0.2, when between 0.75～1, flow through the output current of LED.
According to light modulation pull-down circuit principle, output current meets formula (15) with light modulation pull-down current.
In formula (15), IpullFor dimming the size of pull-down current, IREFFor the size of reference current, IOUTFor flowing through LED's Output current, IRCFor flowing through the rated current of LED, N is transformer primary side secondary turn ratio, RCSFor former limit sampling resistor, RpFor Light modulation pull-down circuit resistance.
The change of thyristor operating angle causes the change of light modulation pull-down current, and then causes the output current that flows through LED Change.So, be to meet the relation shown in formula (14) between output current and thyristor regulating optic angle, only need to dim pull-down current with Between thyristor regulating optic angle, relation meets formula (16).
In formula (16), Ipull1Light modulation pull-down current size during for the angle of flow between 0.5～0.75, Ipull2For conducting Light modulation pull-down current size when angle is between 0.2-0.5, IpullFor the angle of flow 0～0.2, light modulation when between 0.75～1 Pull-down current size, IREFFor reference current size, D is thyristor operating angle, IRCFor output-current rating.
Formula (15), formula (16) are arranged and can obtain formula (17).
According to dimmer design target, quick dimming curve l1Passing point (0.75,1) and (0.35,0), are dimmed Curve l1Linear equation, i.e. formula (18).
l1=2.5 [1- (D+0.25)] (18)
l1Light modulation pull-down current corresponding to dimming curve should meet formula (19).
Ipull1=2.5 [1- (D+0.25)] IREF(19)
Light modulation pull-down current control circuit corresponds to light modulation pull-down current and meets formula (20).
Ipull1=DTRI_P·K1·IREF(20)
Wherein, Ipull1For dimming curve l1Under light modulation pull-down current, DTRI_PFor pull-down current control signal dutycycle, K1·IREFFor dimming curve l1Corresponding specified pull-down current, IREFFor reference current size.
Convolution (19), formula (20), only need to cause DTRI_P=1- (D+25%), K1=2.5, you can meet dimming curve l1 Parameter setting.Now, two corresponding relations need to be met.First, the conducting angle signal for detecting is increased by 25% dutycycle And negate, as the control signal of light modulation pull-down circuit；Second, the specified pull-down current for dimming pull-down circuit is reference current IREF2.5 times.
According to dimming curve design object, dimming curve l at a slow speed2Passing point (0.2,0) and (1,1), are dimmed Curve l2Linear equation, i.e. formula (21).
l2=1.25 (1-D) (21)
l2Light modulation pull-down current corresponding to dimming curve should meet formula (22).
Ipull2=1.25 (1-D) IREF(22)
Light modulation pull-down current control circuit corresponds to light modulation pull-down current and meets formula (23).
Ipull2=DTRI_P·K2·IREF(23)
Wherein Ipull2For dimming curve l2Under light modulation pull-down current, DTRI_PFor pull-down current control signal dutycycle, K2·IREFFor dimming curve l2Corresponding specified pull-down current, IREFFor reference current.
Convolution (22), formula (23) understands, only need to cause DTRI_P=(1-D), K2=1.25 can meet dimming curve l2 Parameter setting.Now, two corresponding relations need to be met.First, conducting angle signal is negated, is directly controlled pull-down current Control circuit；Second, the specified pull-down current of pull-down current circuit is reference current IREF1.25 times.
Realizing dimming curve l1With dimming curve l2Design after, need according to the angle of flow of controllable silicon dimmer, right The use of two curves is reasonably switched.By the angle of flow D that judges controllable silicon dimmer whether the switching of two curves It is controlled more than 50%.As the angle of flow D for detecting controllable silicon dimmer>When 50%, using dimming curve l1Electricity is set Road and parameter；As thyristor operating angle D<When 50%, using dimming curve l2The circuit of setting and parameter.Dimming curve l1By leading Current flow angle detection module ,+25% module, pull-down current (K1=2.5) module composition.+ 25% module is angle of flow compensating module, under Sourcing current (K1=2.5) it is pull-down current control module, its specified pull-down current is set as reference current IREF2.5 times.Conducting Line voltage TRIAC of the angle detection module detection after controllable silicon dimmer copped wave, show that the controllable silicon dimmer angle of flow is believed Number TRI；The dutycycle of TRI signal is increased by 25% after+25% angle of flow compensating module by TRI signal, and to compensating it Signal afterwards is negated, and is obtainedSignal；FinallyIn the pull-down circuit of signal control light modulation angle, output current Ipull1Account for the ratio of rated current.In the same manner, dimming curve l2By angle of flow detection module, INV module and pull-down current (K2= 1.25) module composition.INV is that phase inverter carries out anti-phase obtaining by angle signal TRI is turned onSignal, pull-down current (K2= 1.25) for specified pull-down current be 1.25 times of I of reference currentREFLight modulation pull-down circuit,Signal controls pull-down current Ipull2 Account for the ratio of specified pull-down current.
In two-part dimming arrangement, dimming curve l1, l2Need to judge whether angle of flow D is switched over more than 50%, Thus angle of flow D=50% reference circuit and dimming curve switching circuit need to be added.Angle of flow D=50% reference circuit is conducting Angle switches reference signal.Dimming curve switching circuit, for judging the current angle of flow whether more than 50%, drop-down to determine to gate Current circuit (K1=2.5) or pull-down current circuit (K2, and selected pull-down current control signal is=1.25)Or
In brightness adjustment control, when LED current is larger, the LED luminosity that regulation thyristor operating angle causes changes not Substantially；When LED current is compared with hour, the LED luminosity change that regulation thyristor operating angle causes is obvious.In order to entirely dim Realize than more uniform brightness regulation in the span of control of angle, realize two-part light modulation, i.e., when the angle of flow than larger when so that Flow through the change of LED output current very fast, carry out quick regulation；When the angle of flow is smaller so that flow through the change of LED output current Relatively slow, adjusted at a slow speed, so that the luminosity of LED can be realized than more uniform change in the whole dimming scope Change.
In the two-part adjusting control circuit, angle of flow switching reference circuit and angle of flow switching circuit is set up, is changed Enter corresponding pull-down current control circuit.Described angle of flow switching reference circuit produces angle of flow switching reference signal, described Angle of flow switching circuit after quick light modulation and the design that dims at a slow speed is achieved, according to the angle of flow of controllable silicon dimmer Information, is reasonably switched with light modulation at a slow speed to quick light modulation.Quick light modulation is controlled by judging with the switching for dimming at a slow speed Whether the angle of flow D of silicon dimmer is controlled more than reference value.When the angle of flow D for detecting controllable silicon dimmer is more than ginseng When value is examined, circuit and parameter are set according to quick light modulation；When thyristor operating angle D is less than reference value, foundation is dimmed at a slow speed To arrange circuit and parameter.
Angle of flow switching reference signal circuit schematic diagram is as shown in figure 11.Angle of flow switching reference circuit includes PMOS M19、M20、M21、M22、M23、M24、M25, NMOS tube M26、M27, transmission gate T5, electric capacity C6、C7, operational amplifier A mp6, resistance R10、 R11、R12, comparator Comp5, nor gate.M19Pipe and M20Pipe grid end is interconnected, and source connects power vd D, M21The source connection of pipe M19Pipe drain terminal, M21Pipe and M22Pipe grid end is interconnected, M20Pipe drain terminal connects M22Pipe source, M19And M20Grid end connection M21Drain terminal, M21 Drain terminal connects M23Pipe source, M23Pipe drain terminal connects M24Pipe source, M24Pipe drain terminal connects M25Pipe source, M25Pipe drain terminal is grounded.M23 Pipe, M24Pipe and M25The grid end interconnection of pipe, M24Pipe drain terminal connects M21Pipe, M22Pipe grid end.M22Pipe drain terminal is through electric capacity C6Ground connection, and warp Transmission gate T5Amplifier Amp6 positive input terminal is connect, amplifier positive input terminal is through electric capacity C7Ground connection, amplifier output connection M27Pipe grid end, M27Pipe Drain terminal is through resistance R10Connection power vd D, M27The negative input end of pipe source feedback link amplifier Amp6, meets divider resistance R11、R12, Resistance R12The positive input terminal of comparator Comp5, electric capacity C are just being terminated6Comparator Comp5 negative input end, M are just being terminated26Pipe drain terminal connects Comparator Comp5 negative input end, source is grounded, and grid end connects reset signal.Comparator output signal is and turns on angle compensation electricity The output signal on road.
The angle of flow switches reference signal circuit, input conducting angle signal TRI, output angle of flow switching reference signal TRI_ REF.Angle of flow switching reference signal needs the moment to keep consistent with the frequency of conducting angle signal TRI, and start-phase keeps equal, And ensure its dutycycle for 50%.
TRI obtains of short duration pulse signal Sample through single-shot trigger circuit in the trailing edge triggering of TRI. Sample signal obtains of short duration pulse signal Reset through monostable flipflop in the trailing edge triggering of Sample signal. Sample and Reset signal is used for controlling sampling and resets.IchargeElectric current is charged to electric capacity so that VCVoltage linear increases, VCP Sampling capacitance VCOn crest voltage and carry out 1 after voltage follower:1 electric resistance partial pressure, through 1:V after 1 electric resistance partial pressureCP With voltage VCRelatively, angle of flow reference signal TRI_REF is drawn.
After angle of flow switching reference signal circuit, dutycycle can be obtained for 50%, with the conducting angle signal TRI cycle one Cause, consistent angle of flow switching reference signal TRI_REF of phase place.
According to dimming curve l1With dimming curve l2Design requirement, when the angle of flow more than 0.5 when, dimming curve l1Work, Dimming curve l2Do not work；When the angle of flow is less than 0.5, dimming curve l2Work and dimming curve l1Do not work.Dimming curve l1 With l2There are 2 points of differences in pull-down current control.First, l1Corresponding light modulation pull-down current control signal is conducting angle signal warp The inversion signal that crosses after 25% compensationAnd l2Corresponding light modulation pull-down current control signal is direct for conducting angle signal Negate signalWithout 25% compensation；Second, l1The corresponding specified pull-down current of pull-down circuit that dims is reference current IREF's 2.5 times, and l2The corresponding specified pull-down current of pull-down circuit that dims is reference current IREF1.25 times.
Analyzed according to above, whether angle of flow switching circuit need to be judged more than 50% to the angle of flow, therefore the angle of flow is cut Changing circuit needs to introduce with conducting angle signal is with the cycle and dutycycle is that 50% angle of flow switches reference signal.At whole light modulation angle In transformation range, dimming curve l is carried out1, l2Selection, actually following two parameters are chosen：
(1) pull-down current control signal.Work as D>When 50%, pull-down current control signal is chosenWork as D<50% When, pull-down current control signal is
(2) pull-down current circuit.Work as D>When 50%, specified pull-down current is 2.5 times of I of reference currentREFPull-down current electricity Road gates；Work as D<When 50%, specified pull-down current is 1.25 times of I of reference currentREFPull-down current circuit gating.
Angle of flow switching circuit is realized in D>When 50%, trade-off curve l1；Work as D<When 50%, trade-off curve l2.Entirely adjusting In optical range, two-part light modulation is realized.
Referring to Figure 12, angle of flow switching circuit schematic diagram is as shown in figure 12.Angle of flow switching circuit includes d type flip flop, instead Phase device INV3, two inputs and door AND1, AND2, two input OR gate OR1.The inverted device INV3 of TRI is connected to d type flip flop clock, And the input of AND2 is connected to, the output Q of d type flip flop also connects the input of AND2, and the output connection OR1's of AND2 is defeated Enter, the input of output (Q is non-) the connection AND1 of d type flip flop, the output of angle of flow compensation circuit connects the input with door AND1, with door The input of the output connection OR1 of AND1.Nor gate OR1 exports TRI_P.Output (Q is non-) the output TRI_C of d type flip flop.
Angle of flow switching circuit is a logical signal process circuit with d type flip flop as core, processes TRI, TRI_REF AndThese three signals.It is the angle of flow thermal compensation signal after+25% compensation circuit, TRI_REF is for leading The angle of flow switching reference signal of current flow angle switching reference circuit generation, TRI is conducting angle signal.Under the output of angle of flow switching circuit Sourcing current branch road gating signal TRI_C and pull-down current control signal TRI_P.The two angle of flow switching electricity of TRI_C and TRI_P Road output signal, for controlling the selection of two parameters of dimming curve, control dimming curve is in l1, l2Between switch.
TRI is reversely as d type flip flop clock, and TRI_REF is d type flip flop signal input.When the angle of flow is more than 50%, D Trigger output TRI_C is high level " 1 ", quickly to be dimmed, and gates Ipull1Pull-down current branch road, TRI_P signal and conducting Angle compensation signal TRI_COM is consistent, DTRI_P=1- (D+25%)；When the angle of flow is less than 50%, d type flip flop exports TRI_ C is low level " 0 ", is dimmed at a slow speed, gates Ipull2Pull-down current branch road, the inversion signal of TRI_P and TRI is consistent, DTRI_P=1-D.Wherein, DTRI_PFor the dutycycle of TRI_P signal, D is the dutycycle of angle of flow TRI signal.In view of quick dim Curve l1, with dimming curve l at a slow speed2Difference requirement to pull-down current branch parameters, sets two pull-down current branch roads, respectively Meet pull-down current (K1=2.5) with pull-down current (K2=1.25) requirement.
Referring to Figure 13, two-part light modulation pull-down current circuit theory diagrams are as shown in figure 13.Light modulation pull-down current circuit includes Switch S4, pull-down current circuit Ipull1, pull-down current branch road Ipull2, pull-down current branch road includes operational amplifier A mp7, NMOS Pipe M28, resistance RP1With switch S5.Output current control circuit PMOS M6Drain terminal is through switching S5Connection M28Pipe drain terminal, M28Pipe source Through resistance RP1Ground connection.M28The negative input end of pipe source feedback link to amplifier Amp7, the positive input terminal connection reference of amplifier Amp7 Voltage VREF, amplifier Amp7 output connection M28Grid end.Output signal controlling switch S of angle of flow compensation circuit5Conducting and pass Disconnected.
Ipull1For quick dimming curve l1Corresponding pull-down current, Ipull2For dimming curve l at a slow speed2Corresponding pull-down current, TRI_C is pull-down current gating signal, as TRI_C=1, gates Ipull1 electric current, Ipull=Ipull1；As TRI_C=0, choosing Logical Ipull2Electric current, Ipull=Ipull2.Ipull1, Ipull2The duty cycle adjustment of size of current suspension control signal TRI_P, IpullFor stream Enter the pull-down current of constant-current system.
The subcircuits schematic diagram of pull-down current is as shown in figure the right, and specified pull-down current size is by VREF/RpTo determine, Wherein, VREFFor pull-down current circuit reference voltage, RpFor the corresponding pull down resistor of pull-down current circuit.Make Rp1For pull-down current (K1=2.5) the corresponding pull down resistor of drop-down branch road, Rp2For pull-down current (K2=1.25) the corresponding pull down resistor of drop-down branch road, Then：
Formula (24), in formula (25), VREFFor dimming the reference voltage of pull-down current, IREFReference current for system.
Now, work as D>When 50%, TRI_C=1, Ipull1Branch road is gated,Then pull-down current meets formula (26).
Work as D<When 50%, TRI_C=0, Ipull2Branch road is gated,Then pull-down current meets formula (27).
In this way, then meeting formula (28).
In this way, the two-part dimming arrangement of Optimal Setting can be completed.
The present invention adopts two-part dimming arrangement in the driving circuit, when controllable silicon dimmer is adjusted to maximum conduction angle, Its maximum dimmer electric current IMAXRated current I can be reachedRCSo that electric current compares IMAX/IRCIt is close to 100%.On the other hand, by right Light modulation pull-down circuit carries out parameter optimization so that when controllable silicon dimmer is adjusted to the minimum angle of flow, and its minimum light modulation electric current is Zero, so that its light modulation is than being less than 1%.LED drive circuit of the present invention and same type small-power Dimmable LED drive circuit phase Than with broader brightness regulation scope.
Referring to Figure 14, in the case of input voltage is respectively 90V/60Hz, 110V/60Hz, 120V/60Hz, 132V/60Hz Dimming curve is as shown in figure 14.When the angle of flow is more than 75%, output current can be all reached near rated current 500mA, minimum Light modulation electric current can all reach zero, can all assume two-part regulation in 0%-75% light modulation interval.Adjust in larger light modulation electric current Comparatively fast, adjust relatively slowly when compared with ditty photoelectric current, meet the target of two-part light modulation.Under the identical angle of flow, input voltage Difference, there is fraction of fluctuation in corresponding output current.Generally speaking range of accommodation width, the mesh of two-part light modulation can all be met Mark.
Present example reaches following effect：
Efficiency eta：76%
Power factor PF：0.995
Rated current IRC：510mA
Maximum dimmer electric current IMAX：516mA
Minimum light modulation electric current IMIN：0
Electric current compares IMAX/IRC：100%
I is compared in light modulationMIN/IMAX：1%.

Claims (3)

1. a kind of thyristor regulating Optimizing Control System for LED luminance regulation, including by transformator, NMOS tube M1, former limit detection electricity Resistance RCSInhale with the main topography module of the inverse excitation type converter of assists winding composition and controllable silicon dimmer, diode rectifier bridge, RCD Receive circuit, it is characterised in that：PFC constant current tandem circuit and adjusting control circuit is set up, PFC constant current tandem circuit includes output electricity Stream estimation circuit, output current control circuit and PFC logic control circuit, adjusting control circuit include to turn on angle detection circuit, Angle of flow compensation circuit and pull-down current control circuit；Controllable silicon dimmer carries out copped wave process to inlet highway voltage, through two After pole pipe rectifier bridge, one end of resistance and electric capacity in transformer primary side winding anode and RCD absorbing circuit is on the one hand connected to The negative terminal of the other end connection diode of one end, resistance and electric capacity, the anode connection primary side winding negative terminal of diode and NMOS tube M1Drain terminal, NMOS tube M1Source through former limit detection resistance RCSGround connection, transformer secondary winding negative terminal is through sustained diode0Even It is grounded after connecing LED strip, output capacitance Co is connected in parallel on LED two ends, on the other hand, diode rectifier circuit output is connected to the angle of flow Detection circuit, angle of flow detection circuit output connects pull-down current control circuit through angle of flow compensation circuit, and pull-down current controls Circuit output connects output current control circuit, the output V of output current control circuitCOMPConnection PFC logic control circuit One input, at the same time, auxiliary winding feedback voltage FB equally connects another input of PFC logic control circuit, PFC logic control circuit produces three outputs, output connection NMOS tube M1Grid end, other two output signal TONAnd TOFF Connection output current estimation circuit, former limit detection resistance RCSWith NMOS tube M1The connection end of source also connects output current estimation electricity The input on road, the output V of electric current estimation circuitCALConnection output current control circuit；Wherein：
Output current estimation circuit is used for carrying out appraisal calculating to LED output current, including transmission gate T1, electric capacity C1、C2, computing Amplifier Amp1, resistance R1、R2And NMOS tube M2、M3、M4, former limit detection resistance RCSBoth end voltage is estimated as output current Circuit input signal, former limit detection resistance RCSWith NMOS tube M1The connection end connection transmission gate T of source1Input, transmission gate T1Defeated Go out to hold the positive input terminal of concatenation operation amplifier Amp1 and through electric capacity C1Ground connection, operational amplifier A mp1 outfan connects NMOS tube M2Grid end, NMOS tube M2Drain terminal is through resistance R1Connection power vd D, NMOS tube M2Source is through resistance R2Ground connection, and feedback link is to fortune Calculate amplifier Amp1 negative input end, NMOS tube M2Source is also connected with NMOS tube M3Drain terminal, NMOS tube M3Pipe source connects NMOS tube M4 Pipe drain terminal, NMOS tube M4Pipe source is grounded, NMOS tube M3Pipe and NMOS tube M4The grid end of pipe connects PFC logic control circuit respectively Output signal TOFF、TON, NMOS tube M3 source is used as the output voltage signal V of output circuit estimation circuitCALAnd pass through electric capacity C2Ground connection；
Output current control circuit is according to the output voltage signal V of output current estimation circuitCALAnd pull-down current IpullControl is defeated Go out size of current, system constant current and brightness adjustment control is realized, output current control circuit includes PMOS M5、M6, NMOS tube M7、M8, Operational amplifier A mp2, Amp3, resistance R3、R4, PMOS M5、M6, NMOS tube M7、M8, PMOS M5And PMOS M6Source even Connect power vd D, PMOS M5With PMOS M6Grid end interconnect and connect PMOS M5Pipe drain terminal and NMOS tube M7Drain terminal, NMOS Pipe M7Source is through resistance R3Ground connection, and NMOS tube M7Source feedback link is to operational amplifier A mp2 negative input end, operational amplifier Amp2 positive input terminal connects reference voltage VREF, PMOS M6Pipe drain terminal connects NMOS tube M8Drain terminal, NMOS tube M8Source is through resistance R4Ground connection, and NMOS tube M8Source feedback link is to operational amplifier A mp3 negative input end, and operational amplifier A mp3 positive input terminal is even Connect output current estimation circuit output signal VCAL, additionally, PMOS M6Drain terminal be simultaneously connected to pull-down current control circuit Output；
PFC logic control circuit control system works in critical mode of operation BCM, and ensures in each switch periods, power MOS The ON time of pipe is constant, so as to improve the power factor of system, PFC logic control circuit include comparator Comp1, Comp2, Set-reset flip-floop, current source Icharge, electric capacity C3, switch S1And S2, power vd D is through switching S1 connection current source IchargeAnode, switch S2With electric capacity C3Parallel connection, one end ground connection after parallel connection, the other end connection current source I after parallel connectionchargeNegative terminal, comparator Comp2 Positive input terminal connects current source IchargeNegative terminal, comparator Comp2 negative input end connects reference voltage VCOMP, comparator Comp2's Output DRV_R controlling switch S2Conducting and shutoff, meanwhile, the output DRV_R of comparator Comp2 connection set-reset flip-floop R input End, the positive input terminal ground connection of comparator Comp1, the negative input termination auxiliary winding feedback voltage FB of comparator Comp1, comparator The S input of the output ZCD connection set-reset flip-floop of Comp1, set-reset flip-floop Q end exports DRV signal controlling switch S1Conducting with Turn off；
Conducting angle detection circuit is used for processing the conducting angle information of controllable silicon dimmer and obtaining its angle of flow size, and the angle of flow is examined Slowdown monitoring circuit includes divider resistance R5、R6, transmission gate T2、T3, comparator Comp3, phase inverter INV1, INV2, after chopped rectification Busbar voltage TRIAC inputs to conducting angle detection circuit, through resistance R5、R6Partial pressure, resistance R5With R6Connection end connection comparator Comp3 positive input terminal, reference voltage is through transmission gate T2、T3Connect the negative input end of comparator Comp3, the ratio of comparator Comp3 afterwards Device INV1 inverted compared with result TR1 exports TR2 signal, exports TRI signal after the inverted device INV2 of TR2 signal, and the TRI signal is For turning on the output signal of angle detection circuit, TR1 and TR2 controlling transmission door T2、T3Conducting；
Angle of flow compensation circuit is not reached with solving the controllable silicon dimmer angle of flow by carrying out extra compensation to the angle of flow 100% and the output current that causes is unable to reach the defect of maximum output current, angle of flow compensation circuit includes PMOS M9、 M10、M11、M12、M13、M14、M15, NMOS tube M16、M17, transmission gate T4, electric capacity C4、C5, operational amplifier A mp4, resistance R7、R8、 R9, comparator Comp4 and nor gate NOR1, PMOS M9Grid end and PMOS M10Grid end interconnection and with PMOS M11Drain terminal and PMOS M13Source connects, PMOS M11Grid end and M12Pipe grid end interconnection and with PMOS M13Grid end, PMOS M14Grid end, PMOS M15Grid end and PMOS M14Drain terminal and PMOS M15Source links together, PMOS M15Drain terminal is grounded, PMOS M13Pipe drain terminal connects PMOS M14Pipe source, PMOS M10Drain terminal connects PMOS M12Pipe source, PMOS M12Pipe drain terminal is even Meet transmission gate T4Input, electric capacity C4One end, comparator Comp4 negative input end and NMOS tube M16Drain terminal, NMOS tube M16Source Ground connection, NMOS tube M16Grid end connects reset signal, electric capacity C4The other end is grounded, transmission gate T4Output concatenation operation amplifier Amp4 Positive input terminal and electric capacity C5One end, electric capacity C5The other end is grounded, and operational amplifier A mp4 negative input end connects NMOS tube M17Source And resistance R8One end, resistance R8The other end connects resistance R9One end and comparator Comp4 positive input terminal, resistance R9The other end is grounded, One input of comparator Comp4 output connection nor gate NOR1, another input connection angle of flow of nor gate NOR1 The output signal of output TRI, the nor gate NOR1 of detection circuit is output signal TRI+25% of angle of flow compensation circuit；
Pull-down current control circuit is by specified pull-down current and pull-down current duty cycle control signal co- controlling output current Size, control pull-down current size is realized when pull-down current is constant, and control output current meansigma methodss keep constant, work as the angle of flow Change, during pull-down current change, output current meansigma methodss change, and reach LED luminance regulation, pull-down current control circuit bag Include switch S3, operational amplifier A mp5, NMOS tube M18, resistance RP.Output current control circuit PMOS M6Drain terminal is through switching S3Even Meet M18Pipe drain terminal, M18Pipe source is through resistance RPGround connection, amplifier Amp5 output connection M18Pipe grid end.M18Pipe source feedback link is extremely The negative input end of amplifier Amp5.The positive input terminal connection reference voltage V of amplifier Amp5REF, the output signal of angle of flow compensation circuit Controlling switch S3Conducting and shutoff.
2. the thyristor regulating Optimizing Control System for LED luminance regulation according to claim 1, it is characterised in that：Leading On the basis of current flow angle compensation circuit, set up angle of flow switching reference circuit and angle of flow switching circuit and mate improved drop-down electricity Flow control circuit, realizes the two-part light modulation of wide tuning range, in whole angle of flow excursion, the luminosity energy of LED Than more uniform change, judged and compared with reference standard according to the conducting angle information for detecting, when conducting angle information During more than reference value so that flow through the change of LED output current comparatively fast, dimmed using quick, when the angle of flow is less than reference value, make The change of LED output current must be flowed through relatively slow, using dimming at a slow speed；
Angle of flow switching reference circuit includes PMOS M19、M20、M21、M22、M23、M24、M25, NMOS tube M26、M27, transmission gate T5, Electric capacity C6、C7, operational amplifier A mp6, resistance R10、R11、R12And comparator Comp5, PMOS M19Grid end and PMOS M20 Grid end interconnection and with PMOS M21Drain terminal and PMOS M23Source connects, PMOS M21Grid end and M22Pipe grid end interconnection and with PMOS M23Grid end, PMOS M24Grid end, PMOS M25Grid end and PMOS M24Drain terminal and PMOS M25Source is connected to Together, PMOS M25Drain terminal is grounded, PMOS M23Pipe drain terminal connects PMOS M24Pipe source, PMOS M20Drain terminal connects PMOS Pipe M22Pipe source, PMOS M22Pipe drain terminal connects transmission gate T5Input, electric capacity C6One end, comparator Comp6 negative input end with And NMOS tube M26Drain terminal, NMOS tube M26Source is grounded, NMOS tube M26Grid end connects reset signal, electric capacity C6The other end is grounded, and passes Defeated door T5Output concatenation operation amplifier Amp6 positive input terminal and electric capacity C7One end, electric capacity C7The other end is grounded, operational amplifier Amp6 negative input end connects NMOS tube M27Source and resistance R11One end, resistance R11The other end connects resistance R12One end and comparator Comp5 positive input terminal, resistance R12The other end is grounded, and comparator Comp5 output is the output letter of angle of flow switching reference circuit Number TRI_REF, foregoing circuit structure is essentially identical with angle of flow compensation circuit, simply eliminate in angle of flow compensation circuit or Not gate NOR1；
Angle of flow switching circuit includes d type flip flop, phase inverter INV3, two inputs and door AND1, AND2, and two are input into OR gate OR1, lead Current flow angle switching reference circuit output TRI_REF connection d type flip flop input, turns on output signal TRI of angle detection circuit through anti- Phase device INV3 is connected to d type flip flop clock end and is connected to an input of two inputs and door AND2, the output Q of d type flip flop Two input of connection and another input of door AND2, two inputs are connected of two input OR gate OR1 with the output of door AND2 Input, non-two input of end connection of output Q of d type flip flop and an input of door AND1, the output of angle of flow compensation circuit Two input of signal TRI+25% connection and another input of door AND1, two inputs be connected with the output of door AND1 two be input into or Another input of door OR1, two input OR gate OR1 output signals TRI_P, non-end output signal TRI_C of Q of d type flip flop；
Pull-down current control circuit after improvement includes to switch S4, pull-down current branch road Ipull1, pull-down current branch road Ipull2, switch S4Pull-down current branch road I is gated under the control of angle of flow switching circuit output signal TRI_Cpull1Or pull-down current branch road Ipull2, Correspond to the quick light modulation in two-part light modulation respectively and dim at a slow speed, pull-down current branch road Ipull1With Ipull2Circuit structure is identical, Including operational amplifier A mp7, NMOS tube M28, resistance RP1With switch S5, output current control circuit PMOS M6Drain terminal is through switch S5Connection NMOS tube M28Drain terminal, NMOS tube M28Source is through resistance RP1Ground connection, NMOS tube M28Source also feedback link is to operation amplifier The negative input end of device Amp7, the positive input terminal connection reference voltage V of operational amplifier A mp7REF, the output of operational amplifier A mp7 is even Connect NMOS tube M28Grid end, output signal TRI_P controlling switch S of angle of flow switching circuit5Conducting and shutoff.
3. the thyristor regulating Optimizing Control System for LED luminance regulation according to claim 2, it is characterised in that：Light modulation Process is as follows：
1) conducting angle detection circuit is obtained controllable silicon and leads to the busbar voltage TRIAC signal after controllable silicon dimmer shaping Current flow angle information TRI；
2) angle of flow switching reference circuit generation angle of flow judges reference standard, turns on output signal and the conducting of angle detection circuit Angle judges that reference standard compares；
3) judge the comparative result of reference standard according to conducting angle information and the angle of flow, gate light modulation at a slow speed that two ends formula dims or Quick light modulation；
4) selection is quick dims, and the conducting angle signal for detecting is increased by 25% dutycycle and negates, as the drop-down electricity of light modulation The control signal on road, the specified pull-down current for dimming pull-down circuit is reference current IREF2.5 times；
5) choose and dim at a slow speed, the conducting angle signal for detecting is negated, directly control pull-down current control circuit, pull-down current The specified pull-down current of circuit is reference current IREF1.25 times；
6) pull-down current control circuit and output current control circuit are guaranteed when pull-down current control signal is constant, output current Constant；During the change of pull-down current control signal, control output current change, realize LED luminance regulation.
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107155235A (en) * 2017-05-23 2017-09-12 深圳迈睿智能科技有限公司 A kind of minimum angle of flow of controllable silicon light modulation maintains method and circuit
CN108112130A (en) * 2018-01-11 2018-06-01 厦门恩耐照明技术有限公司 A kind of thyristor regulating optical circuit of unrestricted choice color temperature mode
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202004653U (en) * 2011-04-30 2011-10-05 杭州电子科技大学 Primary side current reference generating circuit of high power factor constant current switching power supply
US20150077009A1 (en) * 2012-05-28 2015-03-19 Panasonic Intellectual Property Management Co., Ltd. Light-emitting diode driving apparatus and semiconductor device
CN105873312A (en) * 2015-02-06 2016-08-17 巨铠实业股份有限公司 Control device using changing conduction angle as control command

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202004653U (en) * 2011-04-30 2011-10-05 杭州电子科技大学 Primary side current reference generating circuit of high power factor constant current switching power supply
US20150077009A1 (en) * 2012-05-28 2015-03-19 Panasonic Intellectual Property Management Co., Ltd. Light-emitting diode driving apparatus and semiconductor device
CN105873312A (en) * 2015-02-06 2016-08-17 巨铠实业股份有限公司 Control device using changing conduction angle as control command

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CN108811223B (en) * 2017-05-02 2021-01-29 美芯晟科技（北京）有限公司 Method and circuit for solving dimming flicker of LED by thyristor
CN107155235A (en) * 2017-05-23 2017-09-12 深圳迈睿智能科技有限公司 A kind of minimum angle of flow of controllable silicon light modulation maintains method and circuit
CN108112130A (en) * 2018-01-11 2018-06-01 厦门恩耐照明技术有限公司 A kind of thyristor regulating optical circuit of unrestricted choice color temperature mode
CN108254675A (en) * 2018-03-14 2018-07-06 奥克斯空调股份有限公司 Pfc circuit failure detector, method and convertible frequency air-conditioner
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CN108777571B (en) * 2018-07-27 2024-04-02 无锡雷利电子控制技术有限公司 Signal generation circuit structure
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CN110677956A (en) * 2019-10-15 2020-01-10 横店集团得邦照明股份有限公司 LED circuit with silicon controlled rectifier dimming and switch section switching and implementation method thereof
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CN113179565B (en) * 2021-05-06 2024-01-12 上海奥简微电子科技有限公司 LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device
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