CN104066256B - The light-dimming method of the phase-cut dimming control circuit based on LED lamp - Google Patents
The light-dimming method of the phase-cut dimming control circuit based on LED lamp Download PDFInfo
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- CN104066256B CN104066256B CN201410330399.XA CN201410330399A CN104066256B CN 104066256 B CN104066256 B CN 104066256B CN 201410330399 A CN201410330399 A CN 201410330399A CN 104066256 B CN104066256 B CN 104066256B
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Abstract
The invention discloses a kind of light-dimming method of the phase-cut dimming control circuit based on LED lamp. The input voltage of the collection after rectification and output current error amplification signal are done multiplying by logic circuit in circuit, when after input voltage cut, the rectified voltage signal collecting is equally by cut, with the output signal multiplying of error amplifier after, the ON time of the cut signal controlling FET obtaining, the angle of cut is larger, and the energy of transformer transmission is less. When load is constant-voltage characteristic load, when cut, reduce output voltage; When load is constant-current characteristics load, when cut, reduce output current. The present invention is based on the output to power supply and carry out constant voltage and constant current control, simultaneously by fictitious load, the means such as signals collecting and processing realize phase-cut dimming function, make whole Circuits System reach the object of compatible constant voltage phase-cut dimming and constant current phase-cut dimming.
Description
Technical field
The present invention relates to LED lighting field, particularly a kind of phase-cut dimming based on LED lampThe light-dimming method of control circuit.
Background technology
Current LED illuminating industry develops rapidly, and impel LED the pursuit of energy-saving benefit in marketThe demand of light modulation grows with each passing day. One of light-dimming method that the light modulation of cut formula is conventional, this method isChange sinusoidal waveform by the angle of flow that regulates the each half-wave of alternating current, thereby change alternating currentThe virtual value of stream, realizes the object of light modulation with this, also referred to as " chopped mode " light modulation. City at presentThe LED product that on field, phase-cut dimming LED driver drives mainly for constant-current mode, butAlso there are some LED product needed constant-voltage mode to drive, as LED lamp band, and prior artThere is no a kind of can be applicable to need simultaneously the LED product of constant current driven and needs constantThe light adjusting circuit of the LED product that voltage drives.
Summary of the invention
In prior art, to there is no one and be applicable to drive constant voltage and constant-current LED simultaneously in order to solveProblem product and phase-cut dimming circuit, the invention provides a kind of cut based on LED lampThe light-dimming method of adjusting control circuit.
Technical scheme of the present invention is as follows:
For a phase-cut dimming control circuit of LED, comprise logic circuit, constant pressure and flow electricityRoad, control loop and transformer;
In described logic circuit, the negative input of error amplifier connects reference voltage, errorThe output of amplifier connects the input of multiplier, the output connection comparator of multiplierNegative input, the output of comparator connects Logic control module, Logic control module defeatedGo out end and connect the input that output drives;
The output connection transformer that the output of described logic circuit drives simple, described transformationThe primary side of device connects constant pressure and flow circuit;
Described constant pressure and flow circuit is by the size of double operational sample detecting control voltage and current;
Described control loop is by the coupled logic of receiving of output signal process light of constant pressure and flow circuitThe positive input of the error amplifier in control circuit.
Its further technical scheme is: described logic circuit is for completion logic signal controlling.
Its further technical scheme is: described constant pressure and flow circuit comprises the first amplifier comparatorWith the second amplifier comparator and the comparison circuit of around sampling.
Its further technical scheme is: described circuit comprises rectification circuit, is connected in circuitInput; Also comprise weakening circuit, described weakening circuit string or be parallel to described rectification circuitInput.
Its further technical scheme is: also comprise decoupling circuit, described decoupling circuit is by oneResistance and a capacitances in series or an independent Capacitance parallel connection are in the pass of foregoing circuit each several partKey signals point place.
Its further technical scheme is: also comprise dummy load circuit, described dummy load circuit byResistance and a capacitances in series or a controlled type resistance is series at the each portion of foregoing circuitIn the major loop dividing.
A light-dimming method that utilizes the above-mentioned phase-cut dimming control circuit for LED and realize,Comprise following steps:
A, at the access constant voltage load of total output or the Constant Current Load of light adjusting circuit, total inputAccess phase-cut dimming device;
The cut signal magnitude of b, detection phase-cut dimming device;
If load that c accesses is constant voltage load, in constant pressure and flow circuit, only has constant voltage circuitWork, detects output voltage signal, judges whether the optocoupler in control loop works, and then sentencesDetermine in logic circuit whether error amplifier output is definite value constant, if NO, circuit inConstant voltage mode, circuit is without dimming function, if yes, and due to the effect of cut signal, constant voltageConstant-current circuit is not worked, and enters steps d;
If the load that accesses is Constant Current Load, in constant pressure and flow circuit, only have constant-current circuit work,Detect output current signal, judge whether the optocoupler in control loop works, and then decision logicIn circuit, whether error amplifier output is definite value constant, and if NO, circuit is in constant current mouldFormula, circuit is without dimming function, if yes, and due to the effect of cut signal, constant pressure and flow electricityNot working in road, enters steps d;
D, in the cut signal of total input of light adjusting circuit has reduced light adjusting circuit logic electricityThe output duty cycle on road;
The simple stored energy of e, transformer reduces, and then transformer secondary output coupling energy fallsLow, if constant voltage load, output voltage reduces, and has reached the order of cut adjustment output voltage; If Constant Current Load, output current reduces, and has reached the order of cut adjustment output current.
Useful technique effect of the present invention is:
The present invention using the circuit of constant output voltage and constant output current as basis, cleverlyUtilize the unconventional mode of operation of constant pressure and flow circuit, realized a kind of can be according to access negativeThe character of carrying, realizes the circuit of constant voltage and the control of constant current mode phase-cut dimming, automatically when load isWhen constant-voltage characteristic load, when cut, can reduce output voltage, realize light modulation effect, when load isWhen constant-current characteristics load, when cut, can reduce output current, realize light modulation effect.
In circuit, increase weakening circuit part, can exempt the existence of electric capacity and inductance in circuitThe resonance phenomena causing; In circuit, also increased fictitious load part, make overall circuit cut largerPhase angle time stabilizing circuit total output; In circuit, also increase uncoupling circuit part, canEffectively to avoid in phase-cut dimming process, the various variable parameters in circuit are always in changingIn process, cause the high order spike that produces in circuit, so just can avoid whole circuitThe output LED load flicker that operation irregularity causes, uncoupling circuit part has played elimination high frequencyNoise, the effect of stabilizing circuit.
Brief description of the drawings
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is logic circuit schematic diagram of the present invention.
Fig. 3 is feedback control loop schematic diagram of the present invention.
Fig. 4 is not work wave when cut of the present invention.
Work wave when Fig. 5 is cut of the present invention.
Fig. 6 is the spike waveform while producing resonance in the present invention.
Fig. 7 is light-dimming method flow chart of the present invention.
Detailed description of the invention
Fig. 1 is for can implement a physical circuit figure of the present invention. Logic circuit portion in Fig. 1The circuit diagram dividing as shown in Figure 2.
As shown in Figure 1 and Figure 2, embodiment is as follows:
(1) constant voltage phase-cut dimming:
Input AC electricity is contact resistance R18 after bridge rectifier DB1 rectification, resistance R 18Be connected to the drive end that the output in logic circuit drives, for logic circuit provides startup electric energy.The output output modulated pulse signal that logic circuit output drives connects the grid of FET Q2The utmost point, drives FET Q2 conducting. The armature winding L1 of transformer T1 can stored energy,And can produce exciting current. The armature winding L1 of transformer T1 connects FET Q2 extremelyResistance R 36, exciting current is connected to computing in logic circuit by sampling resistor R36 and puts like thisThe positive input of large device, with its internal reference voltage ratio, in the time exceeding a reference value, modulate arteries and veinsRush signal step-down, FET Q2 turn-offs, and now the secondary windings L2 of transformer T1 holdsDiode D1 conducting, the Energy Transfer of transformer T1 armature winding L2 storage is to secondary windingsL2. Secondary windings L2 positive terminal connects the positive pole of diode D1. The negative pole of diode D1 withShunt capacitance C2 between the negative input of transformer, capacitor C 3, capacitor C 2A, resistance R 5,Resistance R 6 and resistance R 5A, for realizing filtering and discharging function.
At negative pole contact resistance R10 and resistance R 20 dividing potential drops of diode D1, the letter being divided toNumber be connected to the negative terminal of constant voltage control IC1, the positive input of constant voltage control IC1 connects IC2Do voltage stabilizing 2.5V benchmark. The positive input of constant voltage control IC1 and negative input do like thisRelatively, in the time that the secondary windings L2 of transformer T1 is coupled the energy reduction obtaining, constant voltage controlThe voltage of the negative input sampling of IC1 is less than the voltage of positive input, constant voltage control IC1The high potential of output, constant voltage control IC1 output connects the negative pole of diode D11, diodeThe positive pole of D11 connects the input of the even U3 of light, i.e. 1 end and 2 ends, and 1 end of the even U3 of light connectsConnecting resistance R34 is to VCC, and optocoupler U3 is now due to the high potential of constant voltage control IC1 outputBe greater than the 1 end electromotive force of optocoupler U3, not conducting of optocoupler U3. The 3 end contact resistances of optocoupler U3R24 one end, the other end of resistance R 24 connects the forward input of error amplifier in logic circuitEnd, now in logic control circuit, the signal of error amplifier output is a definite value constant.
When the total input access phase-cut dimming device of circuit and after cut, resistance R 12 and resistanceIn the sample circuit of R30 composition by the positive voltage after rectification, by resistance R 12 and resistance R 30After series connection dividing potential drop, be input to the multiplier in logic circuit. Multiplier in logic circuit is by cutAfter waveform and the parameter of the output of error amplifier do multiplying, the value of multiplier output isValue when cut is not little, and cut is larger, and the value obtaining is less. In logic control circuitThe total driving time of output of Logic control module is shorter, and the output of logic circuit drives passes through resistanceR19 is connected to FET Q2, and total ON time of FET Q2 is shorter, imitates with fieldShould manage the connected total ON time of transformer T1 armature winding L1 of the drain electrode of Q2 shorter, couplingEnergy to transformer T1 armature winding L2 reduces, now the voltage follow transformer of outputThe energy of T1 armature winding L2 reduces and reduces. The phase angle of cut is larger, at the beginning of transformer T1The energy of level winding L 2 is lower, and the voltage of output is lower. Thereby realize cut and reduced outputThe object of voltage.
(2) constant current phase-cut dimming:
Similar with constant voltage phase-cut dimming mode, resistance R 9 is series in output loop, whenWhile having electric current to flow through, current signal is converted into voltage signal by resistance R 9. Resistance R 9 connectsOne end of resistance R 14, the other end of resistance R 14 is connected to the negative sense input of constant current control IC2End. Resistance R 37 dividing potential drop of connecting with resistance R 39, resistance R 37 connects with the common port of resistance R 39Receive the positive input of constant current control IC2, by the positive input of constant current control IC2 and negativeCompare output to input. The output of constant current control IC2 connects diode D12, diodeD12 connects input 1 end and 2 ends of optocoupler U3, the 1 end contact resistance R34 of optocoupler U3,Resistance R 34 is connected to VCC, in the time that the electric current flowing through in resistance R 9 reduces, by resistance R 14Be connected to the lower voltage of constant current control IC2 negative input, constant current control IC2 is now negativeBe less than constant current control IC2 positive input, the output of now constant current control IC2 to inputOutput high potential, with the not conducting of optocoupler U3 input of constant current control IC2 output, afterwardsProcess identical with the constant voltage phase-cut dimming course of work, the phase angle of cut is larger, transformerThe energy of T1 armature winding L2 is lower, and the electric current of output is lower. Thereby realize cut reductionThe object of output current.
In Fig. 1, before weakening circuit is positioned at rectification circuit DB1, resistance R 4 be inductance L 1 withThe weakening resistance of inductance L 1A, if non-resistance R4, inductance L 1 and inductance L 1A in the time of phase-cut dimmingMeeting produces resonance with the electric capacity in circuit, and input AC electricity produces vibration and causes light modulator in leadingIn the switching of leading to and turn-off, cause load LED flicker. Resistance R 11 and capacitor C 5 are cutLight modulator provides enough On currents in the time of minimum angles, maintains dimmer conduction, plays vacationThe effect of load. Capacitor C 8, capacitor C 9, capacitor C 14, capacitor C 11, capacitor C 12 are for goingCoupling electric capacity has variable parameter always in change procedure, Qi Zhonghui in phase-cut dimming processProduce high order spike, impel whole circuit working abnormal, make to export LED load flicker,These electric capacity play elimination high-frequency noise, the effect of stabilizing circuit.
Fig. 3 is feedback control loop schematic diagram of the present invention. The light modulation process of circuit is participated in by feedback control loopComplete.
Fig. 4 is that the present invention is the work wave while not connecing phase-cut dimming device, and Fig. 4-(1) is for exchangingThe voltage waveform of input, Fig. 4-(2) are the voltage waveform after rectification, Fig. 4-(3) are second to adoptThe voltage waveform that after sample circuit sampling, multiplier receives.
While accessing phase-cut dimming device before total input of circuit, suppose that input is that a cut is arrived50% alternating voltage, through DB1 rectification sampling, what sample is adopting of a cut equallySample signal, only has 50% part to obtain after multiplier in work (as dash area)Output signal keeps the waveform of cut, the peak point current sampling letter in the part retaining with transformerNumber relatively control the turn-on and turn-off of FET Q2, begin at the part FET Q2 of cutKeep eventually off state, when therefore primary is transferred to secondary energy and only has not cut50%. Fig. 5 is that circuit of the present invention is added with phase-cut dimming device, and when the cut 50% of phase-cut dimming deviceWork wave, Fig. 5-(1) is for exchanging the voltage waveform of input, Fig. 5-(2) are for after rectificationVoltage waveform, the voltage waveform that Fig. 5-(3) receive for multiplier.
When constant voltage mode, current loop is idle, and current loop is in open loop situations, thisTime output voltage follow the reduction of transformer secondary output output gross energy and reduce. Output voltage fallsAfter low, voltage loop also quits work, and circuit is set up light-modulating mode. Now output is without feedbackSignal is to the electrode input end of the error amplifier of logic circuit inside, i.e. logic circuit insideError amplifier output is a constant, and the output of multiplier is determined by input voltage sampled signal completelyDetermine, determine the size of the transmitting energy of transformer. Having realized cut constant voltage based on this principle adjustsLight function.
Phase-cut dimming principle with constant voltage mode is identical, in the time that load is constant current mode, and constant voltage ringRoad is in open loop situations, and the phase angle of phase-cut dimming device cut is larger, the energy of transformer transmissionLess, output current is followed the reduction of transformer secondary output output energy and is reduced. Output current fallsAfter low, current loop also quits work, and circuit is set up light-modulating mode. Now no-output electric currentFeed back signal to the electrode input end of the error amplifier of logic circuit inside, like this logic circuitIn the output of error amplifier be a constant, the size of transformer transmitting energy is completely controlledIn input voltage sampled signal, thereby reach the object of constant-current dimming.
The present invention is that circuit using constant output voltage and constant output current is as basis. Pass throughGather voltage signal and output current error amplification signal after the AC power rectification of inputtingDo multiplying, when after input voltage cut, the rectified voltage signal of sampling is equally by cut,With the output signal multiplying of error amplifier after, obtain remaining a cut signal,By compared with the peak point current (ON time) of transformer, while controlling the conducting of FETBetween, because the output signal of multiplier is the signal of a cut, FET is by cutIn part-time, turn-off always, do not cut so the energy transmitting by transformer is only leftThe part of phase. The angle of cut is larger, and the energy of transformer transmission is less. Load is constant voltage spyWhen property load, when cut, reduce output voltage; When load is constant-current characteristics load, when cut, fallLow output current; Here it is realizes the general principle of phase-cut dimming.
Whole circuit is the circuit with constant output voltage and constant output current based on this circuitAs basis, difference part be following some:
(1) utilize the multiplying of logic circuit to correct power factor in the uncomfortable light time; Light modulationPower factor is corrected in the multiplying of Shi Liyong logic circuit, simultaneously the transmission energy of control transformerAmount is controlled output parameter and is changed.
(2) in circuit, do not need to increase decoupling and weakening circuit in the uncomfortable light time.
(3) in light adjusting circuit not, need to not increase RC fictitious load below at bridge heap.
If there is resonance to produce in circuit, the waveform in circuit has spike potential to occur, can produce ginsengNumerical mutation, produces load flicker, and spike potential also can be triggered to protection simultaneously, also there will be negativeCarry flicker, as shown in Figure 6, Fig. 6-(1) is the interchange input waveform after cut, Fig. 6-(2)Be the waveform after the first sample circuit sampling, owing to there is parasitic capacitance in circuit, so waveformHave some distortion, the part of irising out in Fig. 6-(3) and Fig. 6-(4) is the spike existing in circuitElectromotive force. Weakening circuit and decoupling circuit can effectively be removed the distortion in these circuit.
Fig. 7 is light-dimming method flow chart of the present invention. As shown in Figure 1 and Figure 7: first will beTotal output access constant voltage or the Constant Current Load of light adjusting circuit, total input access phase-cut dimming device,Detect the cut signal of phase-cut dimming device at resistance R 12 and the common point of resistance R 30. If institute connectsEntering load is constant voltage load, is sampled by resistance R 10 and resistance R 20 dividing potential drops, detects output voltageSignal, judges whether the optocoupler in control loop 2 works, and then in decision logic circuity 4Whether the output of error amplifier is definite value constant. If in control loop 2 without feedback signal,Optocoupler is not worked, and constant pressure and flow circuit 3 is in constant voltage mode, and circuit is without dimming function. If controlIn loop 2 processed, there is feedback signal, optocoupler work, due to the effect of cut signal, constant pressure and constantCurrent circuit 3 is not worked, and the output of circuit only determines by input signal, and circuit enters light-modulating mode.
If load is Constant Current Load, principle is the same with constant voltage load. First at resistance R 12 and electricityThe points of common connection of resistance R30 detects cut signal. Resistance R 9 is by the current signal of output afterwardsBe converted to voltage signal, and this voltage signal is sent to constant current control IC2, detect output electricityStream signal, judges whether the optocoupler in control loop 2 works, and then in decision logic circuity 4The output of error amplifier whether be definite value constant. If in control loop 2 without feedback signal,Be that optocoupler is not worked, constant pressure and flow circuit 3 is in constant current mode, and circuit is without dimming function. IfIn control loop 2, there is feedback signal, optocoupler work, due to the effect of cut signal, constant voltageConstant-current circuit 3 is not worked, and the output of circuit only determines by input signal, and circuit enters light modulation mouldFormula.
No matter the load that connects is voltage loads or current loading, when circuit enters after light-modulating mode,The cut signal of total input of light adjusting circuit has reduced the defeated of logic circuit 1 in light adjusting circuitThe dutycycle that goes out to drive, and then the simple stored energy reduction of transformer 4, transformer 4Secondary coupling energy also reduces, if load is constant voltage load, output voltage reduces, and has reachedThe object of output voltage is adjusted in cut; If Constant Current Load, output current reduces, and has reachedThe object of output current is adjusted in cut.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above enforcementExample. Be appreciated that those skilled in the art are in the prerequisite that does not depart from spirit of the present invention and designThe oher improvements and changes that directly derive or associate down, all should think and be included in guarantor of the present inventionWithin protecting scope.
Claims (1)
1. a light-dimming method for the phase-cut dimming control circuit based on LED lamp, is characterized in that, comprisesFollowing steps:
A, in the access constant voltage load of total output or the Constant Current Load of light adjusting circuit, total input access cutLight modulator;
The cut signal magnitude of b, detection phase-cut dimming device;
If load that c accesses is constant voltage load, in constant pressure and flow circuit (3), only have constant voltage circuit work,Detect output voltage signal, judge whether the optocoupler in control loop (2) works, and then decision logic electricityWhether error amplifier output is definite value constant in road (1), and if NO, circuit is in constant voltage mode,Circuit is without dimming function, if yes, due to the effect of cut signal, not work of constant pressure and flow circuit (3)Do, enter steps d;
If the load that accesses is Constant Current Load, in constant pressure and flow circuit (3), only have constant-current circuit work,Detect output current signal, judge whether the optocoupler in control loop (2) works, and then decision logic electricityWhether error amplifier output is definite value constant in road (1), and if NO, circuit is in constant current mode,Circuit is without dimming function, if yes, due to the effect of cut signal, not work of constant pressure and flow circuit (3)Do, enter steps d;
D, reduce logic circuit (1) in light adjusting circuit at the cut signal of total input of light adjusting circuitOutput duty cycle;
The simple stored energy of e, transformer (4) reduces, and then the secondary coupling energy of transformer (4)Reduce, if constant voltage load, output voltage reduces, and has reached the object of cut adjustment output voltage; IfFor Constant Current Load, output current reduces, and has reached the object of cut adjustment output current.
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| CN201410330399.XA CN104066256B (en) | 2014-07-11 | 2014-07-11 | The light-dimming method of the phase-cut dimming control circuit based on LED lamp |
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| CN201410330399.XA CN104066256B (en) | 2014-07-11 | 2014-07-11 | The light-dimming method of the phase-cut dimming control circuit based on LED lamp |
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| CN105898945A (en) * | 2014-12-04 | 2016-08-24 | 南充市永程电子科技有限公司 | LED driving dimming transformer |
| CN112835405B (en) * | 2020-12-31 | 2022-08-12 | 湖南红太阳光电科技有限公司 | Adjustable trigger plate and control method thereof |
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| US8779676B2 (en) * | 2011-08-31 | 2014-07-15 | Osram Sylvania Inc. | Driver circuit for dimmable solid state light source |
| CN103313472B (en) * | 2010-05-19 | 2016-02-03 | 成都芯源系统有限公司 | LED drive circuit with dimming function and lamp |
| EP2410821B1 (en) * | 2010-07-20 | 2014-01-08 | Panasonic Corporation | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| CN101909391B (en) * | 2010-08-10 | 2013-07-31 | 浙江大学 | Phase-controlled dimming LED drive and driving method thereof |
| US8907581B2 (en) * | 2012-12-17 | 2014-12-09 | Infineon Technologies Austria Ag | Method and circuit for LED driver dimming |
| CN203984738U (en) * | 2014-07-11 | 2014-12-03 | 无锡实益达电子有限公司 | For the phase-cut dimming control circuit of LED lamp |
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