CN104540294A - Auto-excitation type LED conversion device for achieving electrodeless light dimming and control method - Google Patents
Auto-excitation type LED conversion device for achieving electrodeless light dimming and control method Download PDFInfo
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Abstract
The invention discloses an auto-excitation type LED conversion device for achieving electrodeless light dimming and a control method. The auto-excitation type LED conversion device comprises a passive damping light dimming self-adaptation circuit, an AD-DC rectifying circuit, a light dimming flickering stabilization engine circuit, a light dimmer restraining peak voltage and current circuit, an LC filtering circuit, an auto-excitation oscillating circuit, a self-detection linear constant current compensating circuit, an overvoltage detection protective circuit, an LED module temperature protection circuit and an LED module. The auto-excitation oscillating circuit is connected with the other circuits. According to the auto-excitation type LED conversion device, the passive damping light dimming self-adaptation circuit, the light dimming flickering stabilization engine circuit and the light dimmer restraining peak voltage and current circuit are additionally arranged at the front end of an LED load, so that linear brightness variation is achieved when a silicon controlled light dimmer conducts electrodeless light dimming, and flickering light which excites the eyes of people is not generated; meanwhile, the auto-excitation type LED conversion device is simple in circuit structure, the manufacturing cost is low, the electrodeless light dimming function can be achieved, and the defect that light dimming cannot be achieved through an RCC auto-excitation type circuit on the market or the light dimming effect of the RCC auto-excitation type circuit on the market is poor is overcome.
Description
Technical field
The present invention relates to the research field of LED control circuit, be particularly a kind ofly applicable to the auto-excitation type LED conversion equipment that dimmer realizes non-pole light regulating.
Background technology
Along with the development of global economy, shortage of resources and problem of environmental pollution more and more outstanding, be alleviate global energy and environmental protection pressure, LED is introduced into lighting field as revolutionary technological innovation.LED light source has the features such as high energy-saving and environmental protection, long-life, vibration resistance, controllability be strong.LED illumination product is then utilize the produced lighting of LED light source.
While illuminating product is innovated day by day, LED product realizes dimming function and just embodies the advantage more energy-conservation than traditional lighting light fixture further, existing LED lighting dimming product be on the market all application light modulation IC modular design out.
Along with the cost of LED lamp dimming function constantly declines, and LED driver circuit is as the core of LED lamp, and its price ratio also seems very representative.Dimming LED (Light Emitting Diode) driver circuit control chip mainly monopolizes with the external semiconductor manufacturer of NXP, PI on the market at present, and the price of specialized application dimming function control chip account for significant proportion on overall driver circuit cost, therefore, if do not adopt special brightness adjustment control chip to control overall driver circuit as main element, so the cost pressure of LED lamp just can obtain very large alleviation.
Existing a kind of constant current driver circuit for LED, a kind of auto-excitation type LED drive circuit disclosed in Chinese patent CN 203691698U, this LED drive circuit, for LED load provides constant current to drive, comprise the auto-excitation type transducer controlling described constant-current drive circuit duty ratio, described auto-excitation type transducer comprises the first switch element, and the breaking circuit to be connected with described first switch element, one end ground connection of described breaking circuit, the minus earth of described voltage-stabiliser tube, positive pole connects described first switch element, described breaking circuit absorbs the electric current of the first switch element to turn off the first switch element, with reference to figure 1.
Existing a kind of control circuit, RCC circuit and lighting apparatus, as Chinese patent CN 203674968U, its this control circuit, RCC circuit and lighting apparatus provide a kind of control circuit for controlling the switching tube in blocking converter circuit, RCC circuit and lighting apparatus, control circuit comprises switching tube, first pressurizer and the first resistance, it is characterized in that, first end first circuit of the first pressurizer, first pressurizer second end is connected with the base stage of switching tube, and first first termination first circuit of resistance, second end of the first resistance is connected with the emitter of switching tube, with reference to figure 2.
The light source supply module that existing a kind of tool linearity light adjusting controls, as Chinese patent CN 103491665A, it is that the light source supply module that a kind of linearity light adjusting controls includes at least one light-emitting diode, a switching power unit and a control device, this switching power unit comprises a power-switching circuit and a switching circuit, wherein, this power-switching circuit receives the dimming power source that a dimmer exports, and this light-emitting diode is given in output after converting the electric energy of predetermined voltage or electric current to, this switching circuit is that the mode of shaking coil transducer (RCC) circuit formed, the electric current of this light-emitting diode is given in a predetermined current value in order to restriction output, the angle of flow of this dimming power source detected by this control device, and export one and control signal to this switching circuit accordingly, change predetermined current value, in order to the relation of the brightness and the angle of flow that compensate this light-emitting diodes visitor, make it linear, with reference to figure 3.
The light source supply module that above-mentioned tool linearity light adjusting controls, control circuit, RCC circuit and lighting apparatus, although can realize dimming function or LED control circuit, there is following defect in a kind of constant current driver circuit for LED.
1, need the angle of flow of special this dimming power source of detecting, the problem of light modulation flicker and light modulation sudden change cannot be solved.
2, need control device, control circuit is complicated, and cost is very high, is unfavorable for that product is produced in batches.
3, can not be compatible for controllable silicon dimmer on the market.
4, traditional RCC self-maintained circuit is without special overvoltage protection circuit, easily occurs that LED burns phenomenon.
5, traditional RCC self-maintained circuit carries out closed-loop control without special linear constant current compensating circuit, causes constant current accuracy poor, distinct disadvantage, with input voltage fluctuation, causes LED module output current to fluctuate widely, and easily causes that LED is overheated even to be burnt.
Summary of the invention
Main purpose of the present invention is that the shortcoming overcoming prior art is with not enough, provides a kind of and is applicable to the auto-excitation type LED conversion equipment that dimmer realizes non-pole light regulating.
Another object of the present invention is to, provide a kind of and be applicable to the control method that dimmer realizes the auto-excitation type LED conversion equipment of non-pole light regulating.
In order to reach above-mentioned first object, the present invention by the following technical solutions:
A kind of auto-excitation type LED conversion equipment realizing non-pole light regulating, comprise for opening the passive damping light modulation adaptive circuit producing a damping action instantaneously to dimmer each cycle, AC-DC rectification circuit, for automatically adapt to and detect forward position phase-cut dimmer and the rear light modulation along phase-cut dimmer flicker stablize engine circuit, dimmer for carrying out amplitude limit to the peak voltage produced after rectification and electric current suppresses peak voltage current circuit, LC filter circuit, self-maintained circuit, Autonomous test linear constant current compensating circuit, overvoltage detects protective circuit, LED module temperature protection circuit and LED module, described self-maintained circuit glimmer with passive damping light modulation adaptive circuit, AC-DC rectification circuit, light modulation respectively stablize engine circuit, dimmer suppresses peak voltage current circuit, LC filter circuit, Autonomous test linear constant current compensating circuit, overvoltage detect protective circuit, LED module temperature protection circuit, LED module are connected.
Preferably, described passive damping light modulation adaptive circuit comprises the first power resistor R1 parallel with one another and the second power resistor R2, is connected with amplitude limit electric capacity C0 between R1 and R2.
Preferably, described light modulation flicker stablize engine circuit comprise before tangentially light adjusting circuit and rear along phase-cut dimming circuit, before described, tangentially light adjusting circuit comprises the 5th resistance RS5, the 6th resistance RS6, the 7th resistance RS7, the first triode QS1, the first diode DS1, the 3rd electric capacity CS3, the second field effect transistor Q2 and the 4th power resistor R4, for front tangentially dimmer, after powering on, each cycle opens moment, Q2 closes, controllable silicon maintains current circuit and walks power resistor R4, ensure that each cycle of opening has 20-40mA to maintain current path, power on each cycle open moment RS5, RS6, RS7 branch pressure voltage is full of electricity by DS1 rapidly to CS3, charge constant T is determined by RS7 and CS3, Q2 obtains a threshold voltage and is opened, open cycle 20-40mA maintenance current path and walk Q2 formation path, in cycling, QS1 base potential is lower than collector potential, CS3 is discharged by QS1, Q2 is forced to turn off, controllable silicon maintains current circuit and walks power resistor R4.
Preferably, describedly the first resistance RS1, the second resistance RS2, the 3rd resistance RS3, the 4th resistance RS4, the second diode DS2, the second triode QS2, the 3rd diode DS3, the 4th diode DS4, the 5th power resistor R5 is comprised along phase-cut dimming circuit afterwards; For rear along phase-cut dimmer, after RS3, RS4 obtain a dividing potential drop, if QS2 obtains being greater than threshold voltage, then QS2 opens, and ensures that each cycle 10-20mA that opens maintains current path by power resistor RS1, RS2, QS2, DS3, DS4 formation path, in cycling, negative voltage on electric circuit inspection R4, R5, thus the anti-phase conducting of DS3, DS4, DS3, DS4 conducting voltage raises QS2 emitter current potential, now threshold voltage is lower than conduction value, and QS2 closes.
Preferably, dimmer suppresses peak voltage current circuit to comprise after the 3rd diode D3, the 3rd power resistor R3 and the first electric capacity C1, D3 with R3 are connected in series to be connected with C1, and C1 is connected to the cathode terminal of D3.
Preferably, described self-maintained circuit comprises transformer T1, the 8th resistance RS8 and RS9 be connected in series, the tenth resistance RS10 to the 13 resistance RS13 be connected in parallel and the first triode Q1, described transformer T1 comprise main transformer T1-1 and teaser transformer winding T1-2, when Q1 partially opens, another due to Q1 conducting, charge to overvoltage self-inspection protective circuit, simultaneously by overvoltage self-inspection protective circuit, LED module charges to main transformer T1-1, just lower negative voltage on producing one, now teaser transformer winding T1-2 produces an induced voltage, pass through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, under positive feedback effect, make Q1 saturation conduction, interval at saturation conduction, T1-2 induced voltage passes through RS10, RS11, RS12, RS13, CS2, the base stage of Q1, the emitter of Q1 carries out electric discharge generation electric current, this electric current can charge to CS2, CS2 two ends produce just upper negative direction voltage under one, along with the rising of CS2 voltage, due to the rising of CS2 negative potential voltage, Q1 base current declines, and make switching tube Q1 thereupon
Cut-off.
Preferably, because the electric current on transformer T1-1 can not catastrophe characteristics, T1-1 both end voltage is reverse, produce a upper negative lower positive voltage, by D1, LED module is discharged, use T1-2 both end voltage reverse simultaneously, produce a upper negative lower positive voltage, this voltage passes through RS10, RS11, RS12, RS13 charges to CS2, this electric current passes through RS19 again by Q1 base stage and emitter, RS20, RS21, RS22 gets back to the ground of T1-2, now produce a small area analysis, make that Q1 is micro-to be opened, when Q1 lightly conducting, just lower negative voltage in main transformer T1-1 charging generation one, now teaser transformer winding T1-2 produces an induced voltage, this voltage is also upper just lower negative, this is just descending negative voltage pass through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, because Q1 collector current strengthens reason, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, positive feedback effect, make Q1 saturation conduction.
Preferably, described Autonomous test linear constant current compensating circuit comprises the 5th triode QS5 and the 4th triode QS4, the emitter of QS4 is connected with the base stage of QS5, the collector electrode of QS4 is also connected with the 14 resistance RS14 after being connected with the collector electrode of QS5, the base stage of QS4 is connected with RS16 and RS18, be connected with RS17 between RS16 and RS18, the other end of RS18 is also connected with the RS19 to RS22 be connected in parallel; Teaser transformer winding T1-2 inductive voltage value is monitored constantly by RS17, by RS16 current limliting, the electric current on LED module is monitored constantly by precision resistance RS19, RS20, RS21, RS22, by RS18 current limliting, RS16, obtain a current value to control QS4, QS5, controlled the duty ratio of main switch Q1 by QS4, QS5.
In order to reach above-mentioned second object, the present invention by the following technical solutions:
Realize a control method for the auto-excitation type LED conversion equipment of non-pole light regulating, comprise the steps:
S1, passive damping light modulation adaptive circuit are opened dimmer each cycle and are produced a damping action instantaneously, suppress part peak voltage and electric current;
Engine circuit stablize in S2, light modulation flicker, automatic adapt to and detects forward position phase-cut dimmer and rear along phase-cut dimmer, for each work period dimmer conduction provides maintenance current path;
Larger current spike can be produced when voltage after S3, rectification starts to charge to electric capacity, suppress peak voltage current circuit to carry out amplitude limit to the peak voltage produced after rectification and electric current by dimmer;
S4, apply passive damping light modulation adaptive circuit, engine circuit stablize in light modulation flicker, dimmer suppresses peak voltage current circuit to be combined, sawtooth waveforms capacitive load LED module being connected dimmer generation is corrected to resistive load;
S5, overvoltage Autonomous test protective circuit monitor the voltage on LED module in real time, threshold voltage exceedes setting threshold, Dv1 conducting produces a big current, detected by precision resistance again, produce a larger current value, this value exceedes setting threshold, rapid turn-on transistor, drags down switching tube base potential;
S6, monitored the magnitude of voltage of transformer in real time by Autonomous test linear constant current compensating circuit, utilize the change of duty ratio to reach and automatically fall electric current, fall power to realize LED module temperature protection.
Preferably, rectification in step S3 is realized by rectification circuit, when alternating current is by after AC-DC rectifier circuit rectifies, obtain a pulsating dc voltage, a more level and smooth pulsating voltage VDC is obtained again by LC filter circuit, VDC voltage divides two-way, and a road is used for the lightly conducting of main switch, and another road is used for charging to circuit.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, circuit structure of the present invention is simple, only needs minority switching component and light modulation treatment circuit; Cheap for manufacturing cost and can realize non-pole light regulating function, RCC auto-excitation type circuit can not the shortcoming be not good at of light modulation or dimming effect on the market to change tradition.
2, relative to traditional RCC circuit; invention increases passive damping light modulation adaptive circuit; engine circuit is stablized in light modulation flicker, reverse-blocking tetrode thyristor suppresses peak current circuit, Autonomous test linear constant current compensating circuit, overvoltage detects protective circuit; the light modulation of compatible most of dimmer is on the market compatible; over-voltage protecting function prevents LED light source from burning, solve simultaneously input voltage fluctuation cause LED light source output current to become geometric growth to cause LED light source is overheated even burns.
3, the present invention stablizes engine circuit for each work period dimmer conduction of auto-excitation type LED conversion equipment by light modulation flicker provides maintenance current path, by the Based Intelligent Control of switch, operationally in the cycle, power resistor does not work, thus improves the operating efficiency of auto-excitation type LED conversion equipment Circuits System.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of Chinese patent CN 203691698U auto-excitation type LED drive circuit;
Fig. 2 is the circuit theory diagrams of Chinese patent CN 203674968U auto-excitation type LED drive circuit;
Fig. 3 is the circuit theory diagrams of the light source supply module that Chinese patent CN 103491665A linearity light adjusting controls;
Fig. 4 is forward position phase-cut dimmer and rear oscillogram when working along phase-cut dimmer;
Fig. 5 is the circuit theory diagrams of auto-excitation type LED conversion equipment of the present invention;
Fig. 6 is that dimmer connects LED module 108 without sawtooth waveform figure before correction;
Fig. 7 is the oscillogram that LED module connects the steamed bun ripple that dimmer produces;
Fig. 8 is the dimming curve figure of the auto-excitation type LED conversion equipment of non-pole light regulating of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Traditional dimmer applications is in load (incandescent lamp) dimming function of pure resistive, and linear non-pole light regulating function can be realized, when above-mentioned dimmer connects capacitive load (LED light source), now dimmer normally cannot work or produce dazzling passage of scintillation light.Traditional dimmers divides two types: forward position phase-cut dimmer (Leading Edge) its operation principle is that the initial part of each for alternating current half period excises by the Trigger Angle after delayed zero crossing point, cannot pass through, and the part after relief is without the part conducting of excising, realize copped wave light modulation, work in the initial part conducting of contrary mode in alternating current per half period along phase-cut dimmer (Trailing Edge) its operation principle afterwards, and in part cut-off below, realize copped wave light modulation, as shown in Figure 4.
As shown in Figure 5, the present embodiment realizes the auto-excitation type LED conversion equipment of non-pole light regulating, comprise for opening the passive damping light modulation adaptive circuit 101 producing a damping action instantaneously to dimmer each cycle, AC-DC rectification circuit 109, for automatically adapt to and detect forward position phase-cut dimmer and the rear light modulation along phase-cut dimmer flicker stablize engine circuit 106, dimmer for carrying out amplitude limit to the peak voltage produced after rectification and electric current suppresses peak voltage current circuit 102, LC filter circuit 103, self-maintained circuit 104, Autonomous test linear constant current compensating circuit 107, overvoltage detects protective circuit 105, LED module temperature protection circuit 100 and LED module 108, described self-maintained circuit glimmer with passive damping light modulation adaptive circuit, AC-DC rectification circuit, light modulation respectively stablize engine circuit, dimmer suppresses peak voltage current circuit, LC filter circuit, Autonomous test linear constant current compensating circuit, overvoltage detect protective circuit, LED module temperature protection circuit, LED module are connected.
Described passive damping light modulation adaptive circuit 101 comprises the first resistance R1 parallel with one another and the second resistance R2, is connected with amplitude limit electric capacity C0 between R1 and R2; This circuit is opened dimmer each cycle and is produced a damping action instantaneously, suppress part peak voltage and electric current, ensure that each cycle opens momentary spikes voltage and electric current suppresses certain amplitude, like this can the condition that produces of oscillation-damped, prevent dimmer switch device from frequently opening and produce dazzling scintillation with turning off.
Described light modulation flicker stablize engine circuit comprise before tangentially light adjusting circuit and rear along phase-cut dimming circuit, before described, tangentially light adjusting circuit comprises the 5th resistance RS5, the 6th resistance RS6, the 7th resistance RS7, the first triode QS1, the first diode DS1, the 3rd electric capacity CS3, the second field effect transistor Q2 and the 4th power resistor R4, for front tangentially dimmer, after powering on, each cycle opens moment, Q2 closes, controllable silicon maintains current circuit and walks power resistor R4, ensure that each cycle of opening has 20-40mA to maintain current path, power on each cycle open moment RS5, RS6, RS7 branch pressure voltage is full of electricity by DS1 rapidly to CS3, charge constant T is determined by RS7 and CS3, Q2 obtains a threshold voltage and is opened, open cycle 20-40mA maintenance current path and walk Q2 formation path, in cycling, QS1 base potential is lower than collector potential, CS3 is discharged by QS1, Q2 is forced to turn off, controllable silicon maintains current circuit and walks power resistor R4, go round and begin again work.
Describedly comprise the first resistance RS1, the second resistance RS2, the 3rd resistance RS3, the 4th resistance RS4, the second diode DS2, the second triode QS2, the 3rd diode DS3, the 4th diode DS4, the 5th power resistor R5 along phase-cut dimming circuit afterwards, for rear along phase-cut dimmer, when auto-excitation type LED conversion equipment starts, main transformer charges, teaser transformer obtains an induced voltage, RS3, RS4 obtains a dividing potential drop, when QS2 obtains being greater than 1.4V threshold voltage, QS2 opens, ensure that each cycle 10-20mA that opens maintains current path by power resistor RS1, RS2, QS2, DS3, DS4 forms path, in cycling, electric circuit inspection R4, negative voltage on R5, thus DS3, the anti-phase conducting of DS4, DS3, DS4 conducting voltage raises QS2 emitter current potential, the now low 1.4V of threshold voltage, QS2 closes, improve Circuits System operating efficiency, DS2, DS4 clamper function, negative pressure in this circuit is by DS2, DS4 clamper ensures the Vb_e knot of QS2 to-1.4V, not by R4, high negative voltage on R5 punctures, this circuit goes round and begins again periodic duty, this circuit ensures that the 10-20mA needed during rear phase-cut dimmer normally works maintains electric current very well.
Engine circuit 106 is stablized in above-mentioned light modulation flicker, ensure that each work period dimmer conduction of auto-excitation type LED conversion equipment provides maintenance current path, by the Based Intelligent Control of switch, in working time period, power resistor does not work, and ensures auto-excitation type LED conversion equipment Circuits System operating efficiency.Well solve dimmer by 106 circuit and maintain that electric current is abnormal not turns off voluntarily and restart, cause LED module 108 to produce the power frequency flicker problem of restarting and turning off.
Dimmer suppresses peak voltage current circuit 102 to comprise after the 3rd diode D3, the 3rd power resistor R3 and the first electric capacity C1, D3 with R3 are connected in series to be connected with C1, and C1 is connected to the cathode terminal of D3.Dimmer suppresses peak voltage current circuit 102, moment is opened when dimmer internal circuits powers on, internal control switch, needs a large Latch electric current (latching current) when starting conducting, be by R3 to C1 capacitor charging for dimmer internal controlled silicon conducting provides condition.Bus voltage after rectification can produce larger current spike when starting to charge to C1 electric capacity, and this peak current can produce overcurrent to dimmer internal controllable silicon and impact, and damage dimmer, R3, D3 have this peak current amplitude limit function simultaneously.Dimmer connects LED module 108 without sawtooth waveform figure before correction as shown in Figure 6.
Apply passive damping light modulation adaptive circuit, engine circuit stablize in light modulation flicker, dimmer suppresses peak voltage current circuit to be combined, capacitive load LED module 108 is connected sawtooth waveforms that dimmer produces and is corrected to resistive load (incandescent lamp) and connects the steamed bun ripple of dimmer generation as shown in Figure 7.
Described self-maintained circuit 104 comprises transformer T1, the 8th resistance RS8 and RS9 be connected in series, the tenth resistance RS10 to the 13 resistance RS13 be connected in parallel and the first triode Q1, described transformer T1 comprise main transformer T1-1 and teaser transformer winding T1-2, when interchange (Vin) electricity is by after AC-DC rectification circuit 109 rectification, obtain a pulsating dc voltage, a more level and smooth pulsating voltage (VDC) is obtained again by LC filter circuit 103, VDC voltage divides two-way, one tunnel is added to RS8, on RS9, produce a small area analysis, this small area analysis is added to the base stage of Q1, for main switch Q1 lightly conducting provides condition, when Q1 partially opens, another road voltage is due to Q1 conducting, charge to C3, pass through C3 simultaneously, LED load is charged to main transformer T1-1, just lower negative voltage on producing one, now teaser transformer winding T1-2 produces an induced voltage, this voltage is also upper just lower negative, on this, just lower bearing passes through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, due to the reason that Q1 collector current strengthens, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, positive feedback effect, make Q1 saturation conduction, saturation conduction is interval, T1-2 induced voltage passes through RS10, RS11, RS12, RS13, CS2, the base stage of Q1, the emitter of Q1 carries out electric discharge generation electric current, this electric current can charge to CS2, CS2 two ends produce just upper negative direction voltage under one, along with the rising of CS2 voltage, due to the rising of CS2 negative potential voltage, Q1 base current declines, and make switching tube Q1 end thereupon, but, because the electric current on transformer T1-1 can not catastrophe characteristics, T1-1 both end voltage is reverse, produce a upper negative lower positive voltage, therefore this electric current is discharged to LED module 108 by D1, use T1-2 both end voltage reverse simultaneously, produce a upper negative lower positive voltage, this voltage passes through RS10, RS11, RS12, RS13 charges to CS2, this electric current passes through RS19 again by Q1 base stage and emitter, RS20, RS21, RS22 gets back to the ground of T1-2, now produce a small area analysis, micro-the opening of Q1 is made to provide condition, when Q1 lightly conducting, just lower negative voltage in main transformer T1-1 charging generation one, now teaser transformer winding T1-2 produces an induced voltage, this voltage is also upper just lower negative, on this, just lower bearing passes through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, because Q1 collector current strengthens reason, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, positive feedback effect, make Q1 saturation conduction, circulation like this, the work gone round and begun again, auto-excitation type operation principle, RS8, work is participated in during RS9 electrifying startup.
Overvoltage detection protective circuit 105 monitors the voltage on LED module constantly by Dv1; threshold voltage exceedes setting threshold; Dv1 conducting produces a big current; detected by RS19, RS20, RS21, RS22 precision resistance again; produce a larger current value; this value sets threshold more than QS4, QS5; the rapid conducting of QS4, QS5; drag down switching tube Q1 base potential; over-voltage protecting function is played in switching tube Q1 cut-off; thus solve existing self-maintained circuit without special overvoltage protection circuit, easily cause LED module to burn phenomenon.
Described Autonomous test linear constant current compensating circuit 107 comprises the 5th triode QS5 and the 4th triode QS4, the emitter of QS4 is connected with the base stage of QS5, the collector electrode of QS4 is also connected with the 14 resistance RS14 after being connected with the collector electrode of QS5, the base stage of QS4 is connected with RS16 and RS18, be connected with RS17 between RS16 and RS18, the other end of RS is also connected with the RS19 to RS22 be connected in parallel; Teaser transformer winding T1-2 inductive voltage value is monitored constantly by RS17, by RS16 current limliting, the electric current on LED module is monitored constantly by precision resistance RS19, RS20, RS21, RS22, by RS18 current limliting, RS16, obtain a current value to control QS4, QS5, controlled the duty ratio of main switch Q1 by QS4, QS5.This circuit monitors teaser transformer winding T1-2 inductive voltage value constantly by RS17, by RS16 current limliting, RS15, after NTC dividing potential drop, obtain a magnitude of voltage to drive QS4, QS5, cross the duty ratio that a step controls main switch Q1, the Based Intelligent Control of Q1 duty ratio, the LED control circuit device of non-pole light regulating just can realize linear constant current compensate function, equally, due to the fluctuation of input voltage, LED module output current is caused to fluctuate widely, by precision resistance RS19, RS20, RS21, RS22 monitors the electric current on LED module constantly, by RS18 current limliting, RS16, RS15, after NTC dividing potential drop, obtain a current value to control QS4, QS5, further by QS4, QS5 controls the duty ratio of main switch Q1, the Based Intelligent Control of Q1 duty ratio, the LED control circuit device of non-pole light regulating just can realize linear constant current compensate function.
LED module temperature protection circuit 100; this circuit leads to NTC detector unit; monitor LED module temperature constantly; after being compensated by RS15; obtain a current value to control QS4, QS5; control the duty ratio of main switch Q1 further by QS4, QS5, the LED control circuit device that the change of duty ratio reaches non-pole light regulating automatically falls electric current, falls power to meet LED module temperature protection circuit function.
Auto-excitation type converting means (RCC) light adjusting circuit of the present embodiment is operated in critical current mode pattern,
The electric current flowing through energy storage inductor T1-1 when power tube Q1 conducting is started from scratch rising, ON time
Ton＝L*Ipk/(Vdc-Vled)；
Wherein, L is inductance value, and Ipk is the current peak of inductance, and Vdc is the voltage after rectification, and Vled is the voltage drop value of LED module, and f is system operating frequency.
The electric current flowing through energy storage inductor T1-1 when power tube Q1 turns off declines from peak value, to zero time, power tube is open-minded, and the power tube turn-off time is Toff=L*Ipk/Vled;
The formula of energy storage inductor: L=Vled* (Vdc-Vled)/f x Ipk*Vdc.
The present embodiment realizes the control method of the auto-excitation type LED conversion equipment of non-pole light regulating, comprises the steps:
S1, passive damping light modulation adaptive circuit are opened dimmer each cycle and are produced a damping action instantaneously, suppress part peak voltage and electric current;
Engine circuit stablize in S2, light modulation flicker, automatic adapt to and detects forward position phase-cut dimmer and rear along phase-cut dimmer, for each work period dimmer conduction provides maintenance current path;
Larger current spike can be produced when voltage after S3, rectification starts to charge to electric capacity, suppress peak voltage current circuit to carry out amplitude limit to the peak voltage produced after rectification and electric current by dimmer;
S4, apply passive damping light modulation adaptive circuit, engine circuit stablize in light modulation flicker, dimmer suppresses peak voltage current circuit to be combined, sawtooth waveforms capacitive load LED module being connected dimmer generation is corrected to resistive load;
S5, overvoltage Autonomous test protective circuit monitor the voltage on LED module in real time, threshold voltage exceedes setting threshold, Dv1 conducting produces a big current, detected by precision resistance again, produce a larger current value, this value exceedes setting threshold, rapid turn-on transistor, drags down switching tube base potential;
S6, monitored the magnitude of voltage of transformer in real time by Autonomous test linear constant current compensating circuit, utilize the change of duty ratio to reach and automatically fall electric current, fall power to realize LED module temperature protection.
Rectification in step S3 is realized by rectification circuit, when alternating current is by after AC-DC rectifier circuit rectifies, obtain a pulsating dc voltage, a more level and smooth pulsating voltage VDC is obtained again by LC filter circuit, VDC voltage divides two-way, one tunnel is used for the lightly conducting of main switch, and another road is used for charging to circuit.
By above-mentioned control method, the auto-excitation type LED conversion equipment of non-pole light regulating meets NEMASSL6 standard, and dimming curve can match in excellence or beauty with the dimming effect of incandescent lamp, meets responsive rule and NEMA SSL6 standard-required that human eye changes light, as shown in Figure 8.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. one kind realizes the auto-excitation type LED conversion equipment of non-pole light regulating, it is characterized in that, comprise for opening the passive damping light modulation adaptive circuit producing a damping action instantaneously to dimmer each cycle, AC-DC rectification circuit, for automatically adapt to and detect forward position phase-cut dimmer and the rear light modulation along phase-cut dimmer flicker stablize engine circuit, dimmer for carrying out amplitude limit to the peak voltage produced after rectification and electric current suppresses peak voltage current circuit, LC filter circuit, self-maintained circuit, Autonomous test linear constant current compensating circuit, overvoltage detects protective circuit, LED module temperature protection circuit and LED module, described self-maintained circuit glimmer with passive damping light modulation adaptive circuit, AC-DC rectification circuit, light modulation respectively stablize engine circuit, dimmer suppresses peak voltage current circuit, LC filter circuit, Autonomous test linear constant current compensating circuit, overvoltage detect protective circuit, LED module temperature protection circuit, LED module are connected.
2. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 1, it is characterized in that, described passive damping light modulation adaptive circuit comprises the first power resistor R1 parallel with one another and the second power resistor R2, is connected with amplitude limit electric capacity C0 between R1 and R2.
3. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 1, it is characterized in that, described light modulation flicker stablize engine circuit comprise before tangentially light adjusting circuit and rear along phase-cut dimming circuit, before described, tangentially light adjusting circuit comprises the 5th resistance RS5, the 6th resistance RS6, the 7th resistance RS7, the first triode QS1, the first diode DS1, the 3rd electric capacity CS3, the second field effect transistor Q2 and the 4th power resistor R4, for front tangentially dimmer, after powering on, each cycle opens moment, Q2 closes, controllable silicon maintains current circuit and walks power resistor R4, ensure that each cycle of opening has 20-40mA to maintain current path, power on each cycle open moment RS5, RS6, RS7 branch pressure voltage is full of electricity by DS1 rapidly to CS3, charge constant T is determined by RS7 and CS3, Q2 obtains a threshold voltage and is opened, open cycle 20-40mA maintenance current path and walk Q2 formation path, in cycling, QS1 base potential is lower than collector potential, CS3 is discharged by QS1, Q2 is forced to turn off, controllable silicon maintains current circuit and walks power resistor R4.
4. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 2, it is characterized in that, describedly comprise the first resistance RS1, the second resistance RS2, the 3rd resistance RS3, the 4th resistance RS4, the second diode DS2, the second triode QS2, the 3rd diode DS3, the 4th diode DS4, the 5th power resistor R5 along phase-cut dimming circuit afterwards; For rear along phase-cut dimmer, after RS3, RS4 obtain a dividing potential drop, if QS2 obtains being greater than threshold voltage, then QS2 opens, and ensures that each cycle 10-20mA that opens maintains current path by power resistor RS1, RS2, QS2, DS3, DS4 formation path, in cycling, negative voltage on electric circuit inspection R4, R5, thus the anti-phase conducting of DS3, DS4, DS3, DS4 conducting voltage raises QS2 emitter current potential, now threshold voltage is lower than conduction value, and QS2 closes.
5. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 1, it is characterized in that, dimmer suppresses peak voltage current circuit to comprise the 3rd diode D3, the 3rd power resistor R3 and the first electric capacity C1, be connected with C1 after D3 with R3 is connected in series, C1 is connected to the cathode terminal of D3.
6. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 1, it is characterized in that, described self-maintained circuit comprises transformer T1, the 8th resistance RS8 and RS9 be connected in series, the tenth resistance RS10 to the 13 resistance RS13 be connected in parallel and the first triode Q1, described transformer T1 comprise main transformer T1-1 and teaser transformer winding T1-2, when Q1 partially opens, another due to Q1 conducting, charge to overvoltage self-inspection protective circuit, simultaneously by overvoltage self-inspection protective circuit, LED module charges to main transformer T1-1, just lower negative voltage on producing one, now teaser transformer winding T1-2 produces an induced voltage, pass through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, under positive feedback effect, make Q1 saturation conduction, interval at saturation conduction, T1-2 induced voltage passes through RS10, RS11, RS12, RS13, CS2, the base stage of Q1, the emitter of Q1 carries out electric discharge generation electric current, this electric current can charge to CS2, CS2 two ends produce just upper negative direction voltage under one, along with the rising of CS2 voltage, due to the rising of CS2 negative potential voltage, Q1 base current declines, and make switching tube Q1 thereupon
Cut-off.
7. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 6, it is characterized in that, because the electric current on transformer T1-1 can not catastrophe characteristics, T1-1 both end voltage is reverse, produce a upper negative lower positive voltage, by D1, LED module is discharged, use T1-2 both end voltage reverse simultaneously, produce a upper negative lower positive voltage, this voltage passes through RS10, RS11, RS12, RS13 charges to CS2, this electric current passes through RS19 again by Q1 base stage and emitter, RS20, RS21, RS22 gets back to the ground of T1-2, now produce a small area analysis, make that Q1 is micro-to be opened, when Q1 lightly conducting, just lower negative voltage in main transformer T1-1 charging generation one, now teaser transformer winding T1-2 produces an induced voltage, this voltage is also upper just lower negative, this is just descending negative voltage pass through RS10, RS11, RS12, RS13 charges to CS2, this voltage is added to Q1 base stage, Q1 base potential is made to increase, Q1 collector current strengthens further, because Q1 collector current strengthens reason, main transformer T1-1 both end voltage raises again, teaser transformer winding T1-2 induced voltage synchronously raises, positive feedback effect, make Q1 saturation conduction.
8. the auto-excitation type LED conversion equipment realizing non-pole light regulating according to claim 1, it is characterized in that, described Autonomous test linear constant current compensating circuit comprises the 5th triode QS5 and the 4th triode QS4, the emitter of QS4 is connected with the base stage of QS5, the collector electrode of QS4 is also connected with the 14 resistance RS14 after being connected with the collector electrode of QS5, the base stage of QS4 is connected with RS16 and RS18, is connected with RS17 between RS16 and RS18, and the other end of RS is also connected with the RS19 to RS22 be connected in parallel; Teaser transformer winding T1-2 inductive voltage value is monitored constantly by RS17, by RS16 current limliting, the electric current on LED module is monitored constantly by precision resistance RS19, RS20, RS21, RS22, by RS18 current limliting, RS16, obtain a current value to control QS4, QS5, controlled the duty ratio of main switch Q1 by QS4, QS5.
9. realize the control method of the auto-excitation type LED conversion equipment of non-pole light regulating according to claim 1, it is characterized in that, comprise the steps:
S1, passive damping light modulation adaptive circuit are opened dimmer each cycle and are produced a damping action instantaneously, suppress part peak voltage and electric current;
Engine circuit stablize in S2, light modulation flicker, automatic adapt to and detects forward position phase-cut dimmer and rear along phase-cut dimmer, for each work period dimmer conduction provides maintenance current path;
Larger current spike can be produced when voltage after S3, rectification starts to charge to electric capacity, suppress peak voltage current circuit to carry out amplitude limit to the peak voltage produced after rectification and electric current by dimmer;
S4, apply passive damping light modulation adaptive circuit, engine circuit stablize in light modulation flicker, dimmer suppresses peak voltage current circuit to be combined, sawtooth waveforms capacitive load LED module being connected dimmer generation is corrected to resistive load;
S5, overvoltage Autonomous test protective circuit monitor the voltage on LED module in real time, threshold voltage exceedes setting threshold, Dv1 conducting produces a big current, detected by precision resistance again, produce a larger current value, this value exceedes setting threshold, rapid turn-on transistor, drags down switching tube base potential;
S6, monitored the magnitude of voltage of transformer in real time by Autonomous test linear constant current compensating circuit, utilize the change of duty ratio to reach and automatically fall electric current, fall power to realize LED module temperature protection.
10. realize the control method of the auto-excitation type LED conversion equipment of non-pole light regulating according to claim 9, it is characterized in that, rectification in step S3 is realized by rectification circuit, when alternating current is by after AC-DC rectifier circuit rectifies, obtain a pulsating dc voltage, then obtain more level and smooth pulsating voltage VDC, a VDC voltage by LC filter circuit and divide two-way, one tunnel is used for the lightly conducting of main switch, and another road is used for charging to circuit.
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