CN106455216B - A kind of thyristor regulating Optimizing Control System for LED luminance regulation - Google Patents

A kind of thyristor regulating Optimizing Control System for LED luminance regulation Download PDF

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CN106455216B
CN106455216B CN201610911500.XA CN201610911500A CN106455216B CN 106455216 B CN106455216 B CN 106455216B CN 201610911500 A CN201610911500 A CN 201610911500A CN 106455216 B CN106455216 B CN 106455216B
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circuit
angle
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pmos
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CN106455216A (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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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light emitting diodes [LEDs]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A kind of thyristor regulating Optimizing Control System for LED luminance regulation, adjusting control circuit is improved and optimized, 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.Pass through the optimization to dimming pull-down circuit parameter so that when controllable silicon dimmer is adjusted to the minimum angle of flow, output current reaches minimum value of zero.High current LED luminosity is changed for human eye insensitive, and change sensitive phenomenon to low current LED luminosity, dimming curve is optimized, the quick light modulation of design is with dimming at a slow speed two-part dimming curve, realize that two-part dims, with reference to corresponding PFC control circuit, not only meet the High Power Factor met needed for basic LED drive circuit, low harmony wave pollutes, and the basic demand such as stable constant current output, while wide scope regulation can be carried out to LED luminosity according to controllable silicon dimmer.

Description

A kind of thyristor regulating Optimizing Control System for LED luminance regulation
Technical field
The present invention relates to LED brightness regulation technology, and in particular to a kind of thyristor regulating for LED luminance regulation is light-operated System processed.
Background technology
LED (Light Emitting Diode) has long lifespan, low in energy consumption, and brightness is high, a variety of advantages such as small volume, is The novel energy-conserving illuminating product of extensive concern, it is described as " 21 century new light sources ".Compared with traditional incandescent lamp, LED lamp is only Need 1/10 energy consumption that identical luminosity can be achieved, and service life can extend hundreds of times.With the day of LED technology research Beneficial ripe, the traditional lighting system of LED illumination substitution incandescent lamp, Halogen lamp LED etc. is a kind of inexorable trend.
With energy-conserving and environment-protective concept deepen constantly and user's active demand to different light under various circumstances, it is adjustable The illumination scheme of light saves energy consumption with it, and brightness is adjustable, the characteristic such as control simplicity, is widely used in household, handles official business, 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.Illuminating In design, light modulation effect is given full play to, fully achieves the purpose significantly saved.
In dimmer application field, controllable silicon light modulation has the advantages that cost is low, 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, to realize LED luminance by 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 adjustable range is unable to reach, thus limits its dimming scope.Therefore, LED dimming control systems are not only Need to meet the compatibility with controllable silicon dimmer, while also need to realize outstanding dimming behavior.
The content of the invention
Because the angle of flow of controllable silicon dimmer is limited, the adjustable range for often leading to LED output currents is restricted.For The High Power Factor met needed for satisfaction basic LED drive circuit, low harmony wave pollution and stable constant current output etc. require, LED luminosity can be adjusted according to controllable silicon dimmer simultaneously.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 light modulation drop-down electricity The optimization of road parameter so that when controllable silicon dimmer is adjusted to the minimum angle of flow, output current reaches minimum value.Pin of the present invention Change phenomenon that is insensitive, and changing sensitivity to low current LED luminosity, design to high current LED luminosity to human eye Quick light modulation realizes the dimming control system of wide tuning range two-part light modulation with dimming two-part light modulation at a slow speed.
The concrete scheme that the present invention uses is as follows:A kind of thyristor regulating Optimizing Control System for LED luminance regulation, including By transformer, NMOS tube M1, primary side detection resistance RCSWith assists winding form the main topography module of inverse excitation type converter and can Control silicon light modulator, diode rectifier bridge, RCD absorbing circuits, it is characterised in that:Set up PFC constant currents tandem circuit and brightness adjustment control Circuit, PFC constant currents tandem circuit include output current estimation circuit, output current control circuit and PFC logic control circuits, adjust Light control circuit includes conducting 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 processing, after diode rectifier bridge, is on the one hand connected to transformer primary side winding anode and RCD The negative terminal of the other end connection diode of one end of resistance and one end of electric capacity in absorbing circuit, resistance and electric capacity, diode Anode connects primary side winding negative terminal and NMOS tube M1Drain terminal, NMOS tube M1Source through primary side 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 both ends, on the other hand, Diode rectifier circuit output is connected to conducting angle detection circuit, and the angle of flow detects circuit output and connected through angle of flow compensation circuit Pull-down current control circuit, pull-down current control circuit output connection output current control circuit, output current control circuit Export VCOMPAn input of PFC logic control circuits is connected, at the same time, auxiliary winding feedback voltage FB is equally connected Another input of PFC logic control circuits, PFC logic control circuits produce three outputs, an output connection NMOS tube M1Grid end, other two output signal TONAnd TOFFConnect output current estimation circuit, primary side 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 circuitCALConnect output current control Circuit processed;Wherein:
Output current estimation circuit is used to carry out LED output currents appraisal calculating, including transmission gate T1, electric capacity C1、C2, Operational amplifier A mp1, resistance R1、R2And NMOS tube M2、M3、M4, primary side detection resistance RCSBoth end voltage is as output current Estimation circuit input signal, primary side detection resistance RCSWith NMOS tube M1The connection end connection transmission gate T of source1Input, transmission Door T1Output end concatenation operation amplifier Amp1 positive input terminal and through electric capacity C1Ground connection, the connection of operational amplifier A mp1 output ends NMOS tube M2Grid end, NMOS tube M2Drain terminal is through resistance R1Connect power vd D, NMOS tube M2Source is through resistance R2Ground connection, and feed back and connect It is connected to operational amplifier A mp1 negative input ends, 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 logics respectively The output signal T of control circuitOFF、TON, output voltage signal V of the NMOS tube M3 sources as output circuit estimation circuitCALAnd Pass through electric capacity C2Ground connection;
Output voltage signal V of the output current control circuit according to 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 ends Calculate amplifier Amp2 positive input terminals connection reference voltage VREF, PMOS M6Pipe drain terminal connection 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 ends, and operational amplifier A mp3 is just Input connection output current estimation circuit output signal VCAL, in addition, PMOS M6Drain terminal simultaneously be connected to pull-down current control The output of circuit processed;
PFC logic control circuit control systems work in critical mode of operation BCM, and ensure 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 circuits 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 sources IchargeJust End, switch S2With electric capacity C3Parallel connection, one end ground connection after parallel connection, the other end connection current source I after parallel connectionchargeNegative terminal, compare Device Comp2 positive input terminals connection current source IchargeNegative terminal, comparator Comp2 negative input ends connection reference voltage VCOMP, comparator Comp2 output DRV_R controlling switches S2Conducting and shut-off, meanwhile, comparator Comp2 output DRV_R connections SR triggering Device R input, comparator Comp1 positive input terminal ground connection, comparator Comp1 negative input termination auxiliary winding feedback voltage The S inputs of FB, comparator Comp1 output ZCD connection set-reset flip-floops, set-reset flip-floop Q ends output DRV signal controlling switch S1 Conducting and shut-off;
Conducting angle detection circuit is used to handle the conducting angle information of controllable silicon dimmer and obtains its angle of flow size, turns on 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 terminals, reference voltage is through transmission gate T2、T3Comparator Comp3 negative input end, comparator Comp3 are connected afterwards Comparative result TR1 inverted device INV1 output TR2 signals, export TRI signals, TRI letters after the inverted device INV2 of TR2 signals Number it is the output signal for turning on angle detection circuit, TR1 and TR2 controlling transmission doors T2、T3Conducting;
Angle of flow compensation circuit is by carrying out extra compensation to the angle of flow, to solve the controllable silicon dimmer angle of flow up to not The defects of being unable to reach maximum output current to output current caused by 100%, angle of flow compensation circuit include 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 interconnect and with PMOS M11Drain terminal and PMOS M13Source connects, PMOS M11Grid end and M12Pipe grid end interconnect 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 connection PMOS M14Pipe source, PMOS M10Drain terminal connection PMOS M12Pipe source, PMOS M12Pipe drain terminal connects Meet transmission gate T4Input, electric capacity C4One end, comparator Comp4 negative input ends 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 T4Export concatenation operation amplifier Amp4 Positive input terminal and electric capacity C5One end, electric capacity C5The other end is grounded, operational amplifier A mp4 negative input ends connection NMOS tube M17Source And resistance R8One end, resistance R8Other end connection resistance R9One end and comparator Comp4 positive input terminals, resistance R9The other end is grounded, A comparator Comp4 output connection nor gates NOR1 input, nor gate NOR1 another input connection angle of flow The output TRI of circuit is detected, nor gate NOR1 output signal 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 realize that when pull-down current is constant control output current average value keeps constant, when leading Current flow angle changes, and when pull-down current changes, output current average value changes, and reaches LED luminance regulation, pull-down current control electricity Road includes switch S3, operational amplifier A mp5, NMOS tube M18, resistance RP.Output current control circuit PMOS M6Drain terminal is through switch S3Connect M18Pipe drain terminal, M18Pipe source is through resistance RPGround connection, amplifier Amp5 output connections M18Pipe grid end.M18Pipe source feedback connects It is connected to amplifier Amp5 negative input end.Amplifier Amp5 positive input terminal connection reference voltage VREF, the output of angle of flow compensation circuit Signal-controlled switch S3Conducting and shut-off.
The main topography module of inverse excitation type converter, controllable silicon dimmer, diode rectifier bridge, RCD absorbing circuits use into Ripe known circuit structure.
On the basis of above-mentioned angle of flow compensation circuit, angle of flow switching reference circuit and angle of flow switching circuit are set up simultaneously Improved pull-down current control circuit is matched, realizes the two-part light modulation of wide tuning range, in whole angle of flow excursion, LED luminosity can be judged and compared with normative reference than more uniform change according to the conducting angle information detected Compared with when conducting angle information is more than reference value so that flow through the change of LED output currents comparatively fast, using quick light modulation, work as the angle of flow During less than reference value so that it is slower to flow through the change of LED output currents, 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 interconnect and with PMOS M21Drain terminal and PMOS M23Source connects, PMOS M21Grid end and M22Pipe grid end interconnects 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 connection PMOS M24Pipe source, PMOS M20Drain terminal connects PMOS M22Pipe source, PMOS M22Pipe drain terminal connection transmission gate T5Input, electric capacity C6One end, comparator Comp6 negative inputs 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 T5Export concatenation operation amplifier Amp6 positive input terminals and electric capacity C7One end, electric capacity C7The other end is grounded, and computing is put Big device Amp6 negative input ends connection NMOS tube M27Source and resistance R11One end, resistance R11Other end connection resistance R12One end and ratio Compared with device Comp5 positive input terminals, resistance R12The other end is grounded, and comparator Comp5 outputs are the defeated of angle of flow switching reference circuit Go out signal TRI_REF, foregoing circuit structure and angle of flow compensation circuit are essentially identical, simply eliminate 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 export TRI_REF connection d type flip flop inputs, turn on the output signal of angle detection circuit The inverted device INV3 of TRI are connected to d type flip flop clock end and are connected to an input of two inputs and door AND2, d type flip flop The input of output Q connections two and door AND2 another input, two inputs two are connected with door AND2 output and inputs OR gate OR1 An input, the non-input of end connection two of the output Q of d type flip flop and a door AND1 input, angle of flow compensation circuit Output signalThe input of connection two and door AND1 another input, two inputs are connected two with door AND1 output Input OR gate OR1 another input, two input OR gate OR1 output signal TRI_P, the non-end output signals of Q of d type flip flop TRI_C。
Pull-down current control circuit after improvement includes switch S4, pull-down current branch road Ipull1, pull-down current branch road Ipull2, Switch S4Pull-down current branch road I is gated under angle of flow switching circuit output signal TRI_C controlspull1Or pull-down current branch road Ipull2, the quick light modulation in two-part light modulation is corresponded to respectively and is dimmed at a slow speed, pull-down current branch road Ipull1With Ipull2Circuit structure It is identical, including operational amplifier A mp7, NMOS tube M28, resistance RP1With switch S5, output current control circuit PMOS M6Drain terminal Through switching S5Connect NMOS tube M28Drain terminal, NMOS tube M28Source is through resistance RP1Ground connection, NMOS tube M28Source also feedback link is extremely transported Calculate amplifier Amp7 negative input end, operational amplifier A mp7 positive input terminal connection reference voltage VREF, operational amplifier A mp7 Output connection NMOS tube M28Grid end, the output signal TRI_P controlling switches S of angle of flow switching circuit5Conducting and shut-off.
The dimming process of thyristor regulating Optimizing Control System is as follows:
1) angle detection circuit is turned on to the busbar voltage TRIAC signals after controllable silicon dimmer shaping, is obtained controllable Silicon conducting angle information TRI;
2) angle of flow switching reference circuit produce the angle of flow judge normative reference, turn on angle detection circuit output signal and The angle of flow judges that normative reference compares;
3) comparative result of normative reference, the slow-action of gating both ends formula light modulation are judged with the angle of flow according to conducting angle information Light or quick light modulation;
4) quick light modulation is chosen, by the dutycycle of the conducting angle signal detected increase by 25% and is negated, as under light modulation The control signal of puller circuit, the specified pull-down current for dimming pull-down circuit are reference current IREF2.5 times;
5) choose and dim at a slow speed, the conducting angle signal detected 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 ensured when pull-down current control signal is constant, output Electric current is constant;When pull-down current control signal changes, control output current change, realize that LED luminance is adjusted.
Advantages of the present invention and useful achievement:
1) present invention passes through the mode such as PFC (PFC), output current control, it is ensured that LED drive circuit meets High Power Factor, low harmonics distortion and stable constant current output etc. require.
2) present invention realizes that LED luminance wide scope is 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 minimum value, Flow through LED current and reach minimum value.
3) present invention is realized by being segmented to dimming curve, and according to the angle of flow size of controllable silicon dimmer, to quick Light modulation is reasonably switched with light modulation at a slow speed, is realized and is entirely being dimmed in the adjustable range of angle, LED luminosity is relatively Uniform change.
4) circuit structure of the present invention is simple, easily controllable, and low manufacture cost, thus has very high engineering Practical value.
Brief description of the drawings
Fig. 1 is the thyristor regulating Optimizing Control System schematic diagram that the present invention is used for LED luminance regulation;
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 circuits schematic diagram of the present invention;
Fig. 5 is angle of flow detection circuit theory diagrams of the present invention;
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 angle of flow switching reference signal circuit schematic diagram of the present invention;
Figure 12 is angle of flow switching circuit schematic diagram of the present invention;
Figure 13 is two-part light modulation pull-down current control circuit schematic diagram of the present invention;
Figure 14 is present invention dimming curve characteristic under different input voltages.
Embodiment
Referring to Fig. 1, thyristor regulating Optimizing Control System of the present invention, including by transformer, NMOS tube M1, primary side detection resistance RCS The main topography module of inverse excitation type converter and controllable silicon dimmer, diode rectifier bridge, the RCD formed with assists winding absorbs electricity Road, it is characterised in that:PFC constant currents tandem circuit and adjusting control circuit are set up, PFC constant current tandem circuits are estimated including output current Circuit, output current control circuit and PFC logic control circuits are calculated, adjusting control circuit includes conducting angle detection circuit, conducting Angle compensation circuit and pull-down current control circuit;Controllable silicon dimmer carries out copped wave processing 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 circuits are on the one hand connected to, The other end of resistance and electric capacity connects the negative terminal of diode, the anode connection primary side winding negative terminal and NMOS tube M of diode1Leakage End, NMOS tube M1Source through primary side detection resistance RCSGround connection, transformer secondary winding negative terminal is through sustained diode0Connect LED It is grounded after string, output capacitance Co is connected in parallel on LED both ends, and on the other hand, diode rectifier circuit output is connected to angle of flow detection Circuit, the angle of flow detect circuit output and connect 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 circuitCOMPConnect one of PFC logic control circuits Input, at the same time, auxiliary winding feedback voltage FB equally connect another input of PFC logic control circuits, and PFC is patrolled Collect control circuit and produce three outputs, an output connection NMOS tube M1Grid end, other two output signal TONAnd TOFFConnect defeated Go out electric current estimation circuit, primary side 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 circuitCALConnect 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 formed.After output current estimation circuit, output current IOUTEstimated with output current Linear relationship is established between the output signal of circuit.Control the output signal of output current estimation circuit, you can to output current It is controlled.CS is to connect main topology power metal-oxide-semiconductor source, RCSFor primary side sampling resistor, TONFor NMOS tube M1Switch periods ON time, TOFFFor the corresponding turn-off time.In NMOS tube M1A switch periods in, work as M1During conducting, transformer primary side Electric current linear rise by zero, the voltage on primary side sampling resistor remain to electric capacity C by transmission gate1On;Work as M1During shut-off, VCS_SHThe crest voltage on primary side sampling resistor is kept, until next time switching tube turns on.VCS_CAPass through a voltage follower Follow VCS_SHVoltage waveform.VCS_CASignal is by two respectively by TON, TOFFThe switch of control carries out computing, and by electric capacity C2 After keeping filtering, output signal V is obtainedCAL
Pass through two metal-oxide-semiconductors and filter capacitor C controlled by ON time and turn-off time2So that VCAL, meet formula (1)。
Wherein, VCS_PFor in the single switch cycle, the peak value of primary side sample rate current, TOFFFor switching tube turn-off time, TONFor Switching tube ON time.Show that output current meets formula (2) according to the fly-back converter circuit that primary side feedback controls.
Wherein, N is transformer primary side secondary turn ratio, ICS_PFor primary side peak point current, RCSFor primary side sampling resistor.With reference to Formula (1), (2) can draw formula (3).
Because of transformer primary side secondary turn ratio N and primary side sampling resistor RCSRatio N/RCSFor a fixed constant.Thus may be used , output current IOUTLinear relationship is set up between the output voltage signal of output current estimation circuit, to VCALControlled System, as to output current IOUTIt is controlled.
Referring to Fig. 3, output current control circuit includes operational amplifier, the Voltage to current transducer electricity that NMOS and resistance are formed Road and PMOS current mirroring circuits.Pass through 1:The reference current of reference current branch road is accurately reproduced to defeated by 1 PMOS current mirrors Out branch.On output current branch road, output current, pull-down current and reference current meet Kirchhoff's current law (KCL).It is logical Cross voltage control signal caused by pull-down current and output current estimation circuit and control output current size.Pass through 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 pin Electric capacity so that in the case where system mode is stable, COMP voltages keep 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 of NMOS and voltage R compositions, phase is formed The reference current I answeredREF=VREF/R3;Similarly, 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, its is big The small 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)
Pass through the control of prime output current estimation circuit, VCALMeet formula (5).
Wherein RCSFor primary side sampling resistor, N is transformer primary side secondary turn ratio, IOUTFor output current, VCALFor output Electric current estimation circuit output quantity.With reference to 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 quantity, 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, IpullTo dim pull-down current, RCSElectricity is sampled for primary side Resistance, N are 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 the determination of circuit devcie parameter, the size of output current is only big with light modulation pull-down current Small relevant, output current reduces with the increase of light modulation electric current.In the case where light modulation pull-down current keeps constant, output electricity Stream keeps constant.Light modulation drop-down control electric current IpullControlled by controlled silicon conducting angle signal TRI, and then by controlling controllable silicon to lead Current flow angle, change IpullThe size of electric current, so as to adjust LED current, realize that LED luminance is adjusted.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.
Referring to Fig. 4, PFC logic control circuit control systems are worked under BCM patterns, and are ensured in each switch periods, The ON time of power MOS pipe is constant, so as to improve system power factor.PFC logic control circuits are 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 simultaneously effectively when export with R it is effective when calculate, that is, work as S=1, during R=1, export Q=0.PFC logic control circuits profit It is real by the fixation ON time of switching tube with the main topological primary side current of transformer rate of rise and the proportional relation of line voltage Sinuso sine protractor is presented in the peak envelope of existing primary current, realizes High Power Factor.
Voltage FB of the PFC logic control circuits processing in assists winding in topological structure, exports M1The switch of pipe is adjusted Signal DRV processed.When DRV is high level, IchargeElectric current is to electric capacity C3Charging, capacitance voltage are risen with fixed slope;Work as electric capacity Voltage rises to VCOMPDuring voltage, DRV_R signals are high level, electric capacity C3On voltage resetted.When DRV_R signals are effective, S/R latch exports low level, DRV=0, and power MOS pipe is not turned on.M1Pipe is not turned on causing transformer secondary winding with certain Voltage consumption transformer energy storage, when energy storage exhausts, assists winding terminal voltage drastically drops to negative value, FB signals and zero level Signal is compared so that ZCD signals become high level, namely S=1, so that the output Q=1, M of S/R latch1Guan Chong It is new to open.So circulation, control system is operated in BCM mode of operations, and works as VCOMPWhen voltage keeps constant, due on sawtooth waveforms The liter slope moment is consistent, so as to control DRV high level time to be consistent.Utilize the primary side current of transformer rate of rise The proportional relation with line voltage, fixed by the ON time of fixed switching tube, realize that the peak envelope of primary current is presented Go out sinuso sine protractor and realize higher power factor.
Referring to Fig. 5, the angle of flow detects line voltage of the processing of circuit after controllable silicon dimmer copped wave and obtains its angle of flow Information.Conducting angle detection circuit includes divider resistance, transmission gate, comparator and phase inverter.Turn on the input of angle detection circuit Signal is TRIAC voltages for line voltage after controllable silicon copped wave, TRIAC voltages after electric resistance partial pressure with reference voltage through than Compared with device relatively after, inverted device output controlled silicon conducting angle information TRI.The angle of flow detects electric circuit inspection after controllable silicon copped wave Line voltage (TRIAC voltages) is higher than the phase width of zero level, so as to obtain controllable silicon dimmer conducting angle information.By TRIAC High-voltage signal passes through after resistance ratio partial pressure, compared with low level voltage 0.15V, draws the current of controllable silicon dimmer Conduction phase;On the other hand, it is slow using 0.15V~0.35V window in order to shield influence of the level shake to detection accuracy Stagnant comparator.
When V+ voltages are higher than 0.15V, comparator output high level, TR1 is high level, and TR2 is low level, and V- is selected 0.35V voltages, TRI output high level;When V+ level is less than 0.15V, comparator output zero level, TR1 is low level, TR2 For high level, TRI output zero levels.It follows that during V+ voltages are higher than zero level, TRI output high level is on the contrary then defeated Go out zero level.After the angle of flow detects processing of circuit, TRI signals can reflect the phase of TRIAC voltage signals, that is, reflecting can Control the conducting angle information of silicon light modulator.
Angle of flow compensation scheme is introduced in the present invention, so as to improve the tune as caused by the controllable silicon dimmer angle of flow is limited The problem of optical range is limited.DMINFor the light modulator minimum angle of flow, DMAXFor light modulator 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 minimum value, output current reaches minimum Value.In this way, in the adjustable range of limited controllable silicon dimmer, the full dose process control of output current can be realized.Different The maximum and minimum angle of flow and disunity of the light modulator of controllable silicon dimmer manufacturer production, it is however generally that, maximum conducting Angle is 75%, and the minimum angle of flow is 20%, to enable the most of controllable silicon dimmer of the design chip compatibility, can dimmed Realize that full scale dims in the adjustable range of device, in the design process, make 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 being carried out to the angle of flow Extra compensation, to solve because the output current that thyristor operating angle can not reach 100% and trigger is unable to reach maximum output The defects of current value.Angle of flow compensation circuit includes PMOS current mirrors, sampling/holding that transmission gate is formed with voltage follower Circuit, comparator, nor gate, monostable flipflop, NMOS tube and electric capacity etc..PMOS current mirroring circuits fill to electric capacity Electricity, sampling processing is carried out to the both end voltage of charging capacitor by the sampling hold circuit that transmission gate and voltage follower are formed. Sampling processing export with 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 that capacitance voltage resets under reset signal control.In the design, thyristor regulating is made The maximum conduction angle D of light deviceMAX=75%, that is, when detecting that the angle of flow is more than 75%, conducting angle signal is carried out extra The compensation of 25% dutycycle after, angle of flow dutycycle after forced compensation is 100% so that output current reaches maximum output electricity Stream, improve the brightness regulation scope of output current.In angle of flow compensation circuit, left side IchargeElectric current is formed by PMOS Current mirror is to electric capacity VCCharging, is entered by transmission gate with the sampling hold circuit that voltage follower is formed to charging capacitor both end voltage Row sampling processing.NMOS tube is when Reset signals are effective, to VCVoltage is resetted.TRI signals pass through monostable flipflop, Trigger to obtain of short duration pulse signal Sample in TRI trailing edge.Sample signals pass through monostable flipflop, in Sample The trailing edge of signal triggers to obtain of short duration pulse signal Reset.Sample is used to control sampling and resetted with Reset signals.
In angle of flow compensation circuit, IchargeElectric current charges for electric capacity, during charging, VCVoltage constantly raises, Until Reset signals are effective so that VCVoltage amplitude is zero.Before Reset voltages are effective, first make it 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 and V of voltageCVoltage ratio Compared with its comparative result carries out NOT-AND operation with TRI, obtainsDutycycle is the increase of TRI dutycycles After 25% and the result that negates.The signal is the output signal after turning on angle compensation.
Referring to Fig. 7, light modulation pull-down current control circuit produces light modulation pull-down current, changes output current size, it is ensured that When controllable silicon dimmer is adjusted to maximum conduction angle, output current reaches maximum.Adjust to minimum and lead in controllable silicon dimmer During current flow angle, output current reaches minimum value.Pull-down circuit control circuit is dimmed according to the different angles of flow, exports different be averaged Pull-down current, to realize the regulation to output current.Pull-down current control circuit includes operational amplifier and MOSFET is formed Voltage follower, dimming resistor.The output signal control MOSFET drain terminal switches of angle of flow compensation circuit, the connection of MOSFET sources Dimming resistor, dimming resistor both end voltage feed 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 currents are the pull-down current under the control of pull-down current control circuit.Under light modulation The operational amplifier of sourcing current control circuit and MOSFET composition voltage follower structures, RpTo dim 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 flowed through.Wherein, specified pull-down current value is VREF/Rp, typically, specified pull-down current value is made as reference Electric current IREFK times, by adjusting different resistance RpCorresponded from different K values.
For the average value of pull-down current by specified pull-down current and pull-down current duty cycle control signal co- controlling, its is big It is small as shown in formula (9).
When TRI signal dutyfactors are more than 75%, i.e., when the angle of flow is more than 75%, TRI signals are controlled after overcompensation The duty cycle control signal of pull-down current maintains low level always, so when, pull-down current zero is former according to the constant current of system Reason, now, output current reaches maximum.
When TRI signal dutyfactors, which are more than 20%, is less than 75%, IpullElectric current is by 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 dutyfactors are less than 20%, it is desirable to which now output current is zero, namely average pull-down current now Equal to reference current.After dutycycle of the TRI signals by increase by 25%, it is still necessary to be maintained at controllable silicon dimmer and is led in minimum Current flow angle make it that output current is zero.Then, when light modulator is adjusted to the minimum angle of flow, formula (10) is met.
IREF=KIREF(1- (20%+25%)) (10)
In formula (10), IREFFor reference current, KIREFTo dim the specified pull-down current value of pull-down current, equation the right For average pull-down current, the equation left side is reference current, draws 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.
It is as shown in Figure 8 referring to Fig. 8, dimming effect schematic diagram of the present invention after turning on 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 minimum value DMINWhen, output current reaches minimum value;In the adjustable range 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, realizes when the angle of flow is big so that stream It is very fast to cross LED current change, quick regulation is carried out, in angle of flow hour so that it is slower to flow through LED current change, carries out at a slow speed Regulation.
Referring to Fig. 9, two-part dimming effect schematic diagram is as shown in Figure 9.To ensure that adjusting control circuit is sold greatly to market The compatibility of part controllable silicon dimmer, still ensure 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.To ensure in entirely light modulation brightness, the change of the electric current and thyristor regulating optic angle that flow through LED is kept Monotonicity, it is determined that quickly with the point of intersection adjusted at a slow speed, flowing through LED current and be consistent, i.e., when the angle of flow is 50%, stream Cross 37.5% that LED current is its rated current.
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, ordinate are 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 are represented by formula (11).Straight line l2To be slow Velocity modulation light curve, point (20%, 0%), (50%, 37.5%) and (100%, 100%) is crossed, 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)
By formula (11), formula (12) is arranged, and draws the relation such as formula between LED output currents and thyristor operating angle (13) shown in.
In formula (13), IOUT1LED output current, I are flowed through when between 0.5~0.75 for the angle of flowOUT2Exist for the angle of flow LED output current, I are flowed through when between 0.2~0.5RCFor output-current rating.Closed between output current and thyristor operating angle System is as shown in formula (14).
In formula (14), IOUTIt is to dim angle when between 0~0.2,0.75~1, flows through LED output current.
It can be seen from pull-down circuit principle is dimmed, output current meets formula (15) with light modulation pull-down current.
In formula (15), IpullTo dim the size of pull-down current, IREFFor the size of reference current, IOUTTo flow through LED's Output current, IRCTo flow through LED rated current, N is transformer primary side secondary turn ratio, RCSFor primary side sampling resistor, RpFor Dim 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 for flowing through LED Change.So to meet the relation shown in formula (14) between output current and thyristor regulating optic angle, need to only dim pull-down current with Relation meets formula (16) between thyristor regulating optic angle.
In formula (16), Ipull1The light modulation pull-down current size for being the angle of flow when between 0.5~0.75, Ipull2For conducting Light modulation pull-down current size when angle is between 0.2-0.5, IpullFor light modulation of angle of flow when between 0~0.2,0.75~1 Pull-down current size, IREFFor reference current size, D is thyristor operating angle, IRCFor output-current rating.
By formula (15), formula (16), which arranges, can obtain formula (17).
It can be seen from 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 correspondingly dims 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 it 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, by the dutycycle of the conducting angle signal increase by 25% detected And negate, the control signal as light modulation pull-down circuit;Second, the specified pull-down current for dimming pull-down circuit is reference current IREF2.5 times.
It can be seen from 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 correspondingly dims 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) are understood, 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, directly controls 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, it is necessary to according to the angle of flow of controllable silicon dimmer, it is right The use of two curves is reasonably switched.The switching of two curves by judge controllable silicon dimmer angle of flow D whether 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 and parameter of setting.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 The line voltage TRIAC that angle detection module detection is passed through after controllable silicon dimmer copped wave, show that the controllable silicon dimmer angle of flow is believed Number TRI;After the angle of flow compensating module of TRI signals process+25%, the dutycycle of TRI signals is increased by 25%, and to compensating it Signal afterwards negates, and obtainsSignal;FinallyIn signal control light modulation angle pull-down circuit, output current Ipull1Account for the ratio of rated current.Similarly, dimming curve l2By angle of flow detection module, INV modules and pull-down current (K2= 1.25) module composition.INV is that phase inverter carries out anti-phase obtain by angle signal TRI is turned onSignal, pull-down current (K2= 1.25) it is 1.25 times of I of reference current for specified pull-down currentREFLight modulation pull-down circuit,Signal control 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 more than 50% to switch over, Angle of flow D=50% reference circuits and dimming curve switching circuit thus need to be added.Angle of flow D=50% reference circuits are conducting Angle switches reference signal.Dimming curve switching circuit, for judging whether the current angle of flow is more than 50%, to determine to gate drop-down electricity Current circuit (K1=2.5) or pull-down current circuit (K2=1.25), and selected pull-down current control signal isOr
In brightness adjustment control, when LED current is larger, LED luminosity change caused by thyristor operating angle is adjusted not Substantially;When LED current is smaller, it is obvious to adjust LED luminosity change caused by thyristor operating angle.In order to entirely dim Realized in the control range of angle than more uniform brightness regulation, realize the two-part light modulation, i.e., when the angle of flow is bigger so that It is very fast to flow through the change of LED output currents, carries out quick regulation;When the angle of flow is smaller so that flow through the change of LED output currents It is relatively slow, adjusted at a slow speed, so that LED luminosity can be realized than more uniform change in whole dimming scope Change.
In the two-part adjusting control circuit, angle of flow switching reference circuit and angle of flow switching circuit are 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 realized, according to the angle of flow of controllable silicon dimmer Information, quick light modulation and light modulation at a slow speed are reasonably switched.Quick light modulation and the switching dimmed at a slow speed are controllable by judging Whether the angle of flow D of silicon light modulator is more than reference value to be controlled.When the angle of flow D for detecting controllable silicon dimmer is more than ginseng When examining value, circuit and parameter are set according to quick light modulation;When thyristor operating angle D is less than reference value, foundation dims at a slow speed To set 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 interconnects, source connection power vd D, M21The source connection of pipe M19Pipe drain terminal, M21Pipe and M22Pipe grid end interconnects, 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 pass through Transmission gate T5Amplifier Amp6 positive input terminals are connect, amplifier positive input terminal is through electric capacity C7Ground connection, amplifier output connection M27Pipe grid end, M27Pipe Drain terminal is through resistance R10Connect power vd D, M27Pipe source feedback link amplifier Amp6 negative input end, meets divider resistance R11、R12, Resistance R12Positive termination comparator Comp5 positive input terminal, electric capacity C6Positive termination comparator Comp5 negative input ends, M26Pipe drain terminal connects Comparator Comp5 negative input ends, source ground connection, grid end connection reset signal.Comparator output signal is to turn 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 for turning on angle signal TRI, and start-phase keeps equal, And ensure that its dutycycle is 50%.
TRI passes through single-shot trigger circuit, triggers to obtain of short duration pulse signal Sample in TRI trailing edge. Sample signals pass through monostable flipflop, trigger to obtain of short duration pulse signal Reset in the trailing edge of Sample signals. Sample is used to control sampling and resetted with Reset signals.IchargeElectric current charges to electric capacity so that VCVoltage linear increase, VCP Sampling capacitance VCOn crest voltage and by carrying out 1 after voltage follower:1 electric resistance partial pressure, by 1:V after 1 electric resistance partial pressureCP With voltage VCCompare, draw angle of flow reference signal TRI_REF.
After the angle of flow switches reference signal circuit, it is 50% that can obtain dutycycle, with turning on the angle signal TRI cycles one Cause, the consistent angle of flow switching reference signal TRI_REF of phase.
According to dimming curve l1With dimming curve l2Design requirement, when the angle of flow be 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 l22 points of differences in pull-down current control be present.First, l1Corresponding light modulation pull-down current control signal is conducting angle signal warp The inversion signal crossed after 25% compensationAnd l2Corresponding light modulation pull-down current control signal is direct for conducting angle signal Negate signalWithout 25% compensation;Second, l1The corresponding light modulation specified pull-down current of pull-down circuit is reference current IREF's 2.5 times, and l2The corresponding light modulation specified pull-down current of pull-down circuit is reference current IREF1.25 times.
Analyzed more than, whether angle of flow switching circuit need to be judged more than 50% the angle of flow, therefore the angle of flow is cut Change circuit and need to introduce and switch reference signal with cycle and dutycycle for 50% angle of flow with conducting angle signal.At entirely 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, realize that two-part dims.
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 are connected to d type flip flop clock, And AND2 input is connected to, the output Q of d type flip flop also connects AND2 input, and AND2 output connection OR1's is defeated Enter, output (Q is non-) the connection AND1 of d type flip flop input, angle of flow compensation circuit output connection and door AND1 input, with door AND1 output connection OR1 input.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 using d type flip flop as core, handles TRI, TRI_REF AndThese three signals.For the angle of flow thermal compensation signal after+25% compensation circuit, TRI_REF is to lead Angle of flow switching reference signal caused by current flow angle switching reference circuit, TRI are 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.TRI_C and TRI_P the two angles of flow switching electricity Road output signal, for controlling the selection of two parameters of dimming curve, control dimming curve is in l1, l2Between switch.
TRI is reversely used as d type flip flop clock, and TRI_REF inputs for d type flip flop signal.When the angle of flow is more than 50%, D Trigger output TRI_C is high level " 1 ", is quickly dimmed, gates Ipull1Pull-down current branch road, TRI_P signals 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 output TRI_ C is low level " 0 ", is dimmed at a slow speed, gates Ipull2Pull-down current branch road, TRI_P and TRI inversion signal are consistent, DTRI_P=1-D.Wherein, DTRI_PFor the dutycycle of TRI_P signals, D is the dutycycle of angle of flow TRI signals.In view of quick light modulation Curve l1, with dimming curve l at a slow speed2The difference of pull-down current branch parameters is required, 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 S5Connect M28Pipe drain terminal, M28Pipe source Through resistance RP1Ground connection.M28To amplifier Amp7 negative input end, amplifier Amp7 positive input terminal connects to be referred to pipe source feedback link Voltage VREF, amplifier Amp7 output connections M28Grid end.The output signal controlling switch S of angle of flow compensation circuit5Conducting and pass It is 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, Ipull2Size of current suspension control signal TRI_P duty cycle adjustment, 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 pull down resistor corresponding to pull-down current circuit.Make Rp1For pull-down current (K1=2.5) pull down resistor corresponding to branch road, R are pulled downp2For pull-down current (K2=1.25) pull down resistor corresponding to branch road is pulled down, Then:
Formula (24), in formula (25), VREFTo dim the reference voltage of pull-down current, IREFFor the reference current of system.
Now, D is worked as>When 50%, TRI_C=1, Ipull1Branch road gates,Then pull-down current meets formula (26)。
Work as D<When 50%, TRI_C=0, Ipull2Branch road gates,Then pull-down current meets formula (27).
In this way, then meet formula (28).
In this way, the two-part dimming arrangement of optimal setting can be completed.
The present invention uses 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/IRCClose to 100%.On the other hand, by right Dim pull-down circuit and carry out parameter optimization so that when controllable silicon dimmer is adjusted to the minimum angle of flow, 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 having broader brightness regulation scope.
Referring to Figure 14, input voltage is respectively 90V/60Hz, 110V/60Hz, 120V/60Hz, in the case of 132V/60Hz Dimming curve is as shown in figure 14.When the angle of flow is more than 75%, output current can reach near rated current 500mA, minimum Light modulation electric current can reach zero, and two-part regulation can be presented in 0%-75% light modulations section.Adjusted in larger light modulation electric current Comparatively fast, regulation is slower when compared with ditty photoelectric current, meets the target of two-part light modulation.Under the identical angle of flow, input voltage Fraction of fluctuation be present in difference, corresponding output current.Generally speaking it can meet that adjustable range is wide, the mesh of two-part light modulation 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 transformer, NMOS tube M1, primary side detection electricity Hinder RCSThe main topography module of inverse excitation type converter and controllable silicon dimmer, diode rectifier bridge, the RCD formed with assists winding inhales Receive circuit, it is characterised in that:PFC constant currents tandem circuit and adjusting control circuit are set up, PFC constant currents tandem circuit includes output electricity Flow estimation circuit, output current control circuit and PFC logic control circuits, adjusting control circuit include conducting angle detection circuit, Angle of flow compensation circuit and pull-down current control circuit;Controllable silicon dimmer carries out copped wave processing 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 circuits are 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 and NMOS tube of diode M1Drain terminal, NMOS tube M1Source through primary side 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 both ends, and on the other hand, diode rectifier circuit output is connected to the angle of flow Circuit is detected, the angle of flow detects circuit output and connects pull-down current control circuit, pull-down current control through angle of flow compensation circuit Circuit output connects output current control circuit, the output V of output current control circuitCOMPConnect PFC logic control circuits One input, at the same time, auxiliary winding feedback voltage FB equally connect another input of PFC logic control circuits, PFC logic control circuits produce three outputs, an output connection NMOS tube M1Grid end, other two output signal TONAnd TOFF Connect output current estimation circuit, primary side 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 circuitCALConnect output current control circuit;Wherein:
Output current estimation circuit is used to carry out LED output currents appraisal calculating, including transmission gate T1, electric capacity C1、C2, computing Amplifier Amp1, resistance R1、R2And NMOS tube M2、M3、M4, primary side detection resistance RCSBoth end voltage is estimated as output current Circuit input signal, primary side detection resistance RCSWith NMOS tube M1The connection end connection transmission gate T of source1Input, transmission gate T1It is defeated Go out to hold concatenation operation amplifier Amp1 positive input terminal and through electric capacity C1Ground connection, operational amplifier A mp1 output ends connection NMOS tube M2Grid end, NMOS tube M2Drain terminal is through resistance R1Connect power vd D, NMOS tube M2Source is through resistance R2Ground connection, and feedback link is extremely transported Calculate amplifier Amp1 negative input ends, NMOS tube M2Source is also connected with NMOS tube M3Drain terminal, NMOS tube M3Pipe source connection 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 circuits respectively Output signal TOFF、TON, output voltage signal V of the NMOS tube M3 sources as output circuit estimation circuitCALAnd pass through electric capacity C2Ground connection;
Output voltage signal V of the output current control circuit according to output current estimation circuitCALAnd pull-down current IpullControl defeated Go out size of current, realize system constant current and brightness adjustment control, 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 connect Meet 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 ends, operational amplifier Amp2 positive input terminals connection reference voltage VREF, PMOS M6Pipe drain terminal connection NMOS tube M8Drain terminal, NMOS tube M8Source is through resistance R4Ground connection, and NMOS tube M8Source feedback link to operational amplifier A mp3 negative input ends, operational amplifier A mp3 positive input terminals connects Meet output current estimation circuit output signal VCAL, in addition, PMOS M6Drain terminal simultaneously be connected to pull-down current control circuit Output;
PFC logic control circuit control systems work in critical mode of operation BCM, and ensure 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 circuits 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 sources 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 connection current source IchargeNegative terminal, comparator Comp2 negative input ends connection reference voltage VCOMP, comparator Comp2's Export DRV_R controlling switches S2Conducting and shut-off, meanwhile, comparator Comp2 output DRV_R connection set-reset flip-floops R input End, comparator Comp1 positive input terminal ground connection, comparator Comp1 negative input termination auxiliary winding feedback voltage FB, comparator The S inputs of Comp1 output ZCD connection set-reset flip-floops, set-reset flip-floop Q ends output DRV signal controlling switch S1Conducting with Shut-off;
Conducting angle detection circuit is used to handle the conducting angle information of controllable silicon dimmer and obtains its angle of flow size, angle of flow inspection 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 terminals, reference voltage is through transmission gate T2、T3Comparator Comp3 negative input end, comparator Comp3 ratio are connected afterwards Device INV1 inverted compared with result TR1 exports TR2 signals, exports TRI signals after the inverted device INV2 of TR2 signals, the TRI signals are To turn on the output signal of angle detection circuit, TR1 and TR2 controlling transmission doors T2、T3Conducting;
Angle of flow compensation circuit is not reached by carrying out extra compensation to the angle of flow with solving the controllable silicon dimmer angle of flow Output current caused by 100% is unable to reach the defects 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 interconnect and with PMOS M11Drain terminal and PMOS M13Source connects, PMOS M11Grid end and M12Pipe grid end interconnect 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 connection PMOS M14Pipe source, PMOS M10Drain terminal connection PMOS M12Pipe source, PMOS M12Pipe drain terminal connects Meet transmission gate T4Input, electric capacity C4One end, comparator Comp4 negative input ends 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 T4Export concatenation operation amplifier Amp4 Positive input terminal and electric capacity C5One end, electric capacity C5The other end is grounded, operational amplifier A mp4 negative input ends connection NMOS tube M17Source And resistance R8One end, resistance R8Other end connection resistance R9One end and comparator Comp4 positive input terminals, resistance R9The other end is grounded, A comparator Comp4 output connection nor gates NOR1 input, nor gate NOR1 another input connection angle of flow The output TRI of circuit is detected, nor gate NOR1 output signal is the output signal of angle of flow compensation circuit
Pull-down current control circuit passes through specified pull-down current and pull-down current duty cycle control signal co- controlling output current Size, control pull-down current size realize that when pull-down current is constant control output current average value keeps constant, works as the angle of flow Change, when pull-down current changes, output current average value changes, and reaches 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 connections M18Pipe grid end, M18Pipe source feedback link is extremely Amplifier Amp5 negative input end, amplifier Amp5 positive input terminal connection reference voltage VREF, the output signal of angle of flow compensation circuit Controlling switch S3Conducting and shut-off.
2. the thyristor regulating Optimizing Control System according to claim 1 for LED luminance regulation, 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 match improved drop-down electricity Flow control circuit, realize the two-part light modulation of wide tuning range, in whole angle of flow excursion, LED luminosity energy Than more uniform change, judged and compared with normative reference according to the conducting angle information detected, when conducting angle information During more than reference value so that flow through the change of LED output currents comparatively fast, using quick light modulation, when the angle of flow is less than reference value, make It is slower that the change of LED output currents must be flowed through, 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 interconnect and with PMOS M21Drain terminal and PMOS M23Source connects, PMOS M21Grid end and M22Pipe grid end interconnect 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 connection PMOS M24Pipe source, PMOS M20Drain terminal connects PMOS Pipe M22Pipe source, PMOS M22Pipe drain terminal connection transmission gate T5Input, electric capacity C6One end, comparator Comp6 negative input ends 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 is passed Defeated door T5Export concatenation operation amplifier Amp6 positive input terminals and electric capacity C7One end, electric capacity C7The other end is grounded, operational amplifier Amp6 negative input ends connection NMOS tube M27Source and resistance R11One end, resistance R11Other end connection resistance R12One end and comparator Comp5 positive input terminals, resistance R12The other end is grounded, and comparator Comp5 outputs are the output letter of angle of flow switching reference circuit Number TRI_REF, foregoing circuit structure and angle of flow compensation circuit are essentially identical, simply eliminate it is 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, two input OR gate OR1, leads Current flow angle switching reference circuit output TRI_REF connection d type flip flop inputs, turn on the 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 One of the input of connection two and door AND2 another input, two inputs and door AND2 the input OR gate OR1 of output connection two Input, the non-inputs of end connection two of output Q and a door AND1 input, the output of angle of flow compensation circuit of d type flip flop SignalThe input of connection two and door AND1 another input, two inputs be connected with door AND1 output two input or Door OR1 another input, two input OR gate OR1 output signal TRI_P, the non-end output signal TRI_C of Q of d type flip flop;
Pull-down current control circuit after improvement includes switch S4, pull-down current branch road Ipull1, pull-down current branch road Ipull2, switch S4Pull-down current branch road I is gated under angle of flow switching circuit output signal TRI_C controlspull1Or pull-down current branch road Ipull2, The quick light modulation in two-part light modulation is corresponded to respectively and is dimmed 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 S5Connect NMOS tube M28Drain terminal, NMOS tube M28Source is through resistance RP1Ground connection, NMOS tube M28Source also feedback link is to operation amplifier Device Amp7 negative input end, operational amplifier A mp7 positive input terminal connection reference voltage VREF, operational amplifier A mp7 outputs company Meet NMOS tube M28Grid end, the output signal TRI_P controlling switches S of angle of flow switching circuit5Conducting and shut-off.
3. the thyristor regulating Optimizing Control System according to claim 2 for LED luminance regulation, it is characterised in that:Light modulation Process is as follows:
1) angle detection circuit is turned on to the busbar voltage TRIAC signals after controllable silicon dimmer shaping, is obtained controllable silicon and is led Current flow angle information TRI;
2) angle of flow switching reference circuit generation angle of flow judges normative reference, turns on output signal and the conducting of angle detection circuit Angle judges that normative reference compares;
3) judge the comparative result of normative reference according to conducting angle information and the angle of flow, light modulation at a slow speed that gating two-part dims or Quick light modulation;
4) quick light modulation is chosen, by the dutycycle of the conducting angle signal detected increase by 25% and is negated, as light modulation drop-down electricity The control signal on road, the specified pull-down current for dimming pull-down circuit are reference current IREF2.5 times;
5) choose and dim at a slow speed, the conducting angle signal detected 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 ensured when pull-down current control signal is constant, output current It is constant;When pull-down current control signal changes, control output current change, realize that LED luminance is adjusted.
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CN107155235B (en) * 2017-05-23 2020-02-14 深圳迈睿智能科技有限公司 Method and circuit for maintaining minimum conduction angle of silicon controlled rectifier dimming
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