CN105430812A - LED driving circuit in power supply line - Google Patents
LED driving circuit in power supply line Download PDFInfo
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- CN105430812A CN105430812A CN201511007838.4A CN201511007838A CN105430812A CN 105430812 A CN105430812 A CN 105430812A CN 201511007838 A CN201511007838 A CN 201511007838A CN 105430812 A CN105430812 A CN 105430812A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention relates to an LED driving circuit in a power supply line, which comprises a line incoming signal processing unit, a single-stage PFC flyback switch conversion unit, an automatic control signal conditioning and executing unit, and an output voltage and current detection unit, wherein the line incoming signal processing unit is used for receiving power supply line incoming signals and carrying out bidirectional anti-interference filter to output mains supply signals; the mains supply signals are converted into DC electric signals with a pulsation component; the single-stage PFC flyback switch conversion unit is used for receiving the DC electric signals and the mains supply signals, carrying out PWM pulse modulation, acquiring low-voltage DC signals and outputting the low-voltage DC signals; the automatic control signal conditioning and executing unit is used for receiving the DC electric signals and the mains supply signals and outputting driving power signals changed in real time according to electric features of the power supply line; and the output voltage and current detection unit is used for receiving the low-voltage DC signals and the driving power signals and outputting feedback control signals to the single-stage PFC flyback switch conversion unit. Through adjusting the output voltage value of a centralized voltage-stabilizing power supply device in a reasonable range, the control information is borne on the power supply line, and a voltage stabilizing function in a new voltage-stabilizing value condition can be kept.
Description
Technical field
The present invention relates to LED drive circuit, particularly relate to and utilize that lighting power supply line is double does lamp control information
'slED drive circuit.
Background technology
LED illumination technology achieves significant progress and development in recent years, with its very high luminous efficiency, impayable long-lived characteristic, excellent photochromic, the convenience that drives and be subject to the favorable comment of user flexibly.Although once had dispute after a while at the initial stage of introducing to the market, now perfect by constantly developing, rapidly accept by users, and welcome the climax of penetration and promotion.
LED illumination technology range of application is wide, not only can apply in the family, the public illumination occasions such as square, market, school, street lamp, airport, bridge can also be widely used in, the luminous efficiency having benefited from its light fixture is very high, the thermal losses of the energy can be greatly reduced, realize the green low-carbon environment-friendly in city illumination field, also by introducing intelligent dimming control technology and equipment, carry out managing control in real time, flexibly to light intensity according to actual needs, the economize on electricity potential of further excavation LED illumination technology, and make the intelligent level that city illumination reaches higher.
Want to control light intensity, mode usual at present has two kinds:
One is preprogram control mode, namely the light intensity of expection and the relation curve of time are made " illumination service chart ", and program downloads is in the embedded microprocessor in LED driver, then after powering up every day, light fixture all under control of the microprocessor, different lighting powers is selected according to residing Different periods, namely predetermined illumination service chart work is strictly followed automatically, this mode is simple and convenient, but must carry out carefully conscientiously knowing the real situation, analyze and planning to lighting demand in advance, after determining once programme, rethink amendment and just quite bother.
Another kind is real-time commitment mode, not only above-mentioned " illumination service chart " can be downloaded to as required at any time in the embedded microprocessor in LED driver by signal on-line normalization mode, can also according to specific demand, the work of manual intervention microprocessor at any time, and then change the running status of light fixture immediately, namely reach disengaging " illumination service chart " and carry out the instant object manipulated flexibly.If add the feedback information process of light fixture running status, modern intelligentized illumination monitoring management really could be deserved to be called.
Above-mentioned the second controllable lighting management system has a feature clearly, namely a set of information transmission loop of carrying out real time communication with embedded microprocessor is needed, this cover information transmission loop can be wired, such as power line carrier, RS485 industrial-controlled general line etc., also can be wireless, the radio frequency transmission of such as point-to-multipoint, point-to-point RF relay, zigbee wireless networking etc.But, these conventional transmission meanss all must outside original lamp system at present, separately lay the communications cable or be equipped with wireless communication transmissions system equipment, and because communication system equipment is all independent of light fixture, and also must pass through such as 0-10V voltage control interface, 4-20mA current loop control interface or other digital control interface between light fixture and could be connected, realize the real-time control to light fixture.
Summary of the invention
The object of the invention is the deficiency overcoming above prior art, proposes one and utilizes that lighting power supply line is double does lamp control information
'slED drive circuit, avoid technology path and the method for another building communication lines completely, to overcome the loaded down with trivial details and not enough of various control methods conventional at present, succinctly realize easily realizing quick, real-time control to LED luminaire for public lighting, specifically realized by following technical scheme:
LED drive circuit in described supply line, comprising:
Inlet wire signal processing unit, receives power supply inlet wire signal, carries out two-way anti-interference filtration and exports city's signal of telecommunication; The described city signal of telecommunication is converted to the DC signal containing ripple component and exports;
Single-stage PFC flyback switch transition unit, receives described DC signal and city's signal of telecommunication, carries out pwm pulse modulation, then after high frequency transformer step-down process and secondary rectifying and wave-filtering, obtains low-voltage dc signal and export;
Automatic control signal condition and performance element, receive described DC signal and city's signal of telecommunication, exports the driving power signal changed in real time according to the electric characteristic of supply line;
Output voltage current detecting unit, receive described low-voltage dc signal and driving power signal, the signal of described reception is obtained current sampling data and voltage sample value by the resitstance voltage divider being connected on sampling resistor in direct current output loop, DC output end is arranged respectively accordingly, and electric current, voltage sample value are again through amplifying the backward described single-stage PFC flyback switch transition unit output feedback ontrol signal of process.
The further design of described supply line automatic control light adjusting type LED drive circuit is, also comprise isolated constant voltage and current limiting closed loop feedback unit, this unit accepts described feedback control signal and form error signal after amplifying, after more described error signal being closed road by linear optocoupler, send into single-stage PFC flyback switch transition unit, realize closed loop feedback.
The further design of described supply line automatic control light adjusting type LED drive circuit is, described single-stage PFC flyback switch transition unit comprises rectification, filter function block, flyback dc-dc converter and Active Power Factor Correction functional block,
Described Active Power Factor Correction function receives the DC signal that inlet wire signal processing unit exports, and carries out electric current and primary voltage same frequency homophase that copped wave makes inlet wire signal, exports the second DC signal;
described flyback dc-dc converter is used for carrying out pwm pulse modulation to the DC signal containing power frequency ripple component, obtains described second DC signal, then through high frequency transformer
every straight withstep-down process, after the secondary rectifying and wave-filtering finally by described rectification, filter function block, obtains described low-voltage direct and exports.
The further design of described supply line automatic control light adjusting type LED drive circuit is, in described isolated constant voltage and current limiting closed loop feedback unit, feedback control signal is amplified by three error amplifier TL431 and is formed error signal, be respectively IC4, IC5, IC6, wherein IC4 is voltage error amplifier, IC6, IC5 forms current error amplifier jointly, IC4, IC5, the negative input end of IC6 is built-in with an accurate 2.5V source of stable pressure respectively, output is respectively arranged with one and expands stream triode, IC5, the negative electrode of IC4 is directly connected, be connected to the internal illumination pipe negative pole of optocoupler OPT1, IC5, the anode of IC4 is also directly connected with anode, be connected to one end that described direct current exports sampling resistor, the negative electrode of IC6 is connected to the internal illumination pipe positive pole of optocoupler OPT1 by divider resistance.
The further design of described supply line automatic control light adjusting type LED drive circuit is, described single-stage PFC flyback switch transition unit comprises PWM switch control chip IC2, diode D2, D3, D5, switching tube Q1, electric capacity C5, C11, and resistance R1, R2, R3, R4, R5, R6, R9, R11, the source electrode of R12, Q1 is by resistance R11 ground connection, and the pressure drop that Q1 operating current is formed through R1 is as current sampling signal, and deliver to 4 pin of IC2, for realizing the overcurrent protection of power tube, the grid of Q1 is controlled by IC2, by resistance R9, the parallel circuits of D3 is connected to 7 pin of IC2, and 1 pin of IC2 is adjustment voltage input end, and the output of described inlet wire signal processing unit is through resistance R2, R3 and R4 connects 3 pin of IC2 after sampling dividing potential drop, the positive pole of D5 is connected to 5 pin of IC2 by resistance R12,8 pin of IC2 pass through R5, the positive pole of R6 and C5 is connected, and the pulse current that Q1 work is formed carries out secondary rectification by diode D2 after transformation, then by after C11 smothing filtering, is sent to LED lamp through DC output end.
The further design of described supply line automatic control light adjusting type LED drive circuit is, described output voltage current detecting unit comprises resistance R21 and resistance R22, the positive pole that R21, R22 are connected across the feedback control signal output of this unit exports between negative pole GND2, the dividing point of R22 upper end is connected with the reference electrode end of IC4, realizes voltage sample
.
The further design of described supply line automatic control light adjusting type LED drive circuit is, also comprises R14 in described output voltage current detecting unit, and R14 is connected between the DC output end negative pole GND of negative pole GND2 and reality, realizes current sample.
The further design of described supply line automatic control light adjusting type LED drive circuit is, automatic control signal condition and performance element comprise microprocessor IC1, optocoupler OPT2, optocoupler OPT3, electric capacity C9, resistance R23, resistance R24, resistance R25, resistance R31, resistance R32, high frequency transformer, diode D6 rectification, electric capacity C10 and be provided with linear three terminal regulator
iC3, IC3+ 5V the voltage exported delivers to 20 pin of IC1, electric capacity C9, resistance R23 connects and accesses between+5V accessory power supply and ground, the tie point of series connection is connected with 1 pin of IC, 7 pin of IC1, 6 pin are connected to the negative pole of the interior light emitting diodes of optocoupler OPT2 and optocoupler OPT3 respectively accordingly, the positive pole of these two light-emitting diodes is then respectively by resistance R29, R30 is connected to+5V power end, optocoupler OPT2, the collector electrode of the inner phototriode of OPT3 passes through R31 respectively accordingly, R32 is connected on the reference electrode of described IC4, the emitter of the inner phototriode of optocoupler OPT2 is connected with the emitter of the inner phototriode of optocoupler OPT3, and be connected to the anode of IC4, R31, R32 respectively accordingly with OPT2, in parallel with R22 again after phototriode series connection in OPT3.
The further design of described supply line automatic control light adjusting type LED drive circuit is, inlet wire signal processing unit comprises inductance L 1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, fuse F1 and rectifier circuit, described C1, C2 are connected across the two ends of L1 respectively
described C3, C4 serial connection is connected to the input of rectifier circuit again, and the serial connection point of C3, C4 is connected to protecting field end,common mode disturbances on filter out power incoming line, described F1
be connected between power supply L line input and the positive pole of C1for overcurrent protection.
Advantage of the present invention is as follows:
The present invention carries out deep technological transformation to common single-stage PFC inverse-excitation type switch power-supply, introduce microprocessor on the one hand, continuously sampling analysis is carried out to the electric parameter of incoming power, identify at any time electric parameter change the control information of implying, adjustable interface is introduced on the other hand in the closed loop feedback control loop of constant current constant voltage, as required, microprocessor can export sample circuit by this interface to driver and carry out rapid structural parameter adjustment, under the prerequisite that a reference source is constant, be achieved constant voltage, current limliting is adjusted the change as required of numerical value, thus reach the object changing adjustment lamp power.
The LED driver that the present invention relates to and concentrated voltage stabilizing power supply unit with the use of, remote illumination control centre real-time control information as required, by adjusting the output voltage values of concentrated voltage stabilizing power supply unit in the reasonable scope, control information is carried in supply line, still keeps the voltage stabilizing function under new voltage stabilizing value condition simultaneously.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of supply line's automatic control light adjusting type LED driver that patent of the present invention proposes.
Fig. 2 is an embodiment of supply line's automatic control light adjusting type LED driver that patent of the present invention proposes.
Fig. 3 is the symbol of TL431 and inner equivalent schematic diagram.
Embodiment
Below the present invention program is described in detail.
As Fig. 1, this LED drive circuit comprises: A inlet wire signal processing unit, B single-stage PFC flyback switch transition unit, C output voltage current detecting unit, the isolated constant voltage and current limiting closed loop feedback unit of D and E automatic control signal condition and performance element.Wherein the function of various piece is as follows:
A inlet wire signal processing unit
This part is connected between the power supply inlet wire of LED driver and single-stage PFC flyback switch transition unit, inlet wire filtering link carries out two-way anti-interference filtration, both isolated the impact of electrical network clutter on driver, the harmonic wave produced during the work of driver for isolating internal electronic element is again to the pollution of electrical network.Be converted to direct current containing ripple component through filtered civil power in rectification link, be supplied to single-stage PFC flyback switch transition unit, for realizing preparing to the power factor correction of civil power input.Surge protection link is made up of some the surge protection element be equipped with in inlet wire filtering link, for absorbing transient electrical pulses too high in power supply or being released into ground.
B single-stage PFC flyback dc-dc converter
PFC flyback dc-dc converter is connected between " inlet wire signal processing unit " and " output voltage current detecting unit ", realizes the isolation between DC-DC conversion and primary and secondary.
PFC flyback dc-dc converter is the core component of LED driver.Single-stage PFC flyback dc-dc converter is simplified by two-stage PFC flyback dc-dc converter to form.Before traditional pfc circuit is generally arranged in flyback switching converter circuit, the two forms series relationship, and wherein i.e. " Active Power Factor Correction ", this technology carries out copped wave according to specific rule to the direct voltage that rectification link provides to PFC, exports
dC signal containing power frequency ripple component,inlet wire current can be forced to reach with primary voltage with frequency homophase, and waveform keep consistent with inlet wire sinusoidal voltage waveform, to realize the perfect condition that power factor is approximately 1; Flyback dc-dc converter is used for carrying out pwm pulse modulation to the direct current after the process of PFC level on the other hand,
obtain the second DC signal,again after high frequency transformer step-down process and secondary rectifying and wave-filtering, obtaining required low-voltage direct and export, is a DC-DC translation process.
Two-stage PFC flyback dc-dc converter every grade all needs a power switch pipe, and " the single-stage PFC flyback dc-dc converter " that adopt here, then that the function of the two is combined together, utilize a power switch pipe to coordinate peripheral component, the original function needing two power switch pipes to realize can be completed simultaneously.The particular architectures of circuit also eliminates a high-voltage electrolytic capacitor for smothing filtering after rectification link, and therefore, single-stage PFC flyback dc-dc converter structure is simple, and power consumption is lower, and equipment dependability is improved, and the life-span is longer.But it is higher to the requirement of power switch pipe and low-pressure side secondary rectifying and wave-filtering.
C output voltage current detecting unit
Linear relationship is approximately between LED operating current and luminous intensity, and LED is very responsive to the stability of operating voltage, its reason is that its V-I characteristic curve is very large, small supply power voltage change can cause the change greatly of electric current, in addition, LED is not conventional, electric-resistance load, its characteristic curve also can along with variations in temperature occur compared with large horizontal displacement, even if supply power voltage is highly stable, electric current equi-stable can not be ensured, therefore, first LED drive power not only must have the basic stabilized voltage characteristic of D.C. regulated power supply, also must have simultaneously and detect and the ability of steady operation electric current.Output voltage current detecting unit is established for this purpose just.The detection of output voltage obtains voltage sample value by the resitstance voltage divider arranged at DC output end, and the detection of output current is then sampling resistor of connecting in direct current output loop, and resistance terminal voltage is current sampling data.Two sampled values, after amplifying process, control as the output of feedback control signal to PFC flyback dc-dc converter, reach voltage stabilization and current stabilization object, also achieve the protection to equipment and light fixture simultaneously.
When load current is lower than current stabilization threshold value, driver runs with voltage regulation way; And when load current reach current stabilization threshold value or have exceed current stabilization threshold value tendency time, driver seamlessly transits as current stabilization mode is run.It should be noted that, basic voltage stabilizing threshold value and current stabilization threshold value not only can set by adjusting respective potentiometer of adjusting, and can also be set by the magnification ratio of the voltage ratio or current sample treatment loop that change above-mentioned resitstance voltage divider under micro-processor control.
The isolated constant voltage and current limiting closed loop feedback unit of D
Isolated constant voltage and current limiting closed loop feedback unit is connected between the PWM/PFC control chip of " output voltage current detecting and protection " loop and " single-stage PFC flyback dc-dc converter ", and the isolation for control signal is transmitted.
In order to the safety used is with convenient, reduce interference signal to the harmful effect of complete machine stability, the ac power supply circuit of LED driver and direct current output loop must be completely isolated.In order to form the closed loop feedback between output and input circuit, the isolation transmission of control signal must be realized by the device of optical coupler one class.Here linear optocoupler is adopted, conjunction road is carried out optocoupler is elementary by from the voltage of error amplifier and current feedback signal, and the secondary signal obtained is sent into the pwm chip of flyback dc-dc converter, the parameter exporting pulse for changing it exports with the direct current of robust driver.
E automatic control signal condition and performance element
This unit is different from general LED driver, the power of driving is provided to change in real time to LED lamp, and this change does not need additional any communication line or communication apparatus, can realize as long as receive in supply line that supporting adjustable alternating current steady voltage plug sends here.
Automatic control signal condition and performance element are connected to powers between input circuit and measure voltage & current loop, for carrying out the constant pressure and flow threshold value that control and drive system exports according to the electric characteristic of supply line, and then completes the management and control to LED lamp operate power.The core of automatic control signal condition and performance element is embedded microprocessor, the electric parameter of its forward path of this devices use to power supply input circuit is sampled, by analysis with computing after, obtain the driving power code that should be supplied to LED lamp, then actuator is driven by backward channel, cooperating measure is carried out to constant voltage and current limiting closed feedback loop, and then changes voltage sampling and current sampling value, complete adjusting and regulation and control to the driving power of LED lamp.
Below in conjunction with the embodiment in Fig. 2, describe the technology performance of patent of the present invention in detail.
Wherein A inlet wire signal processing unit and B single-stage PFC flyback dc-dc converter as follows:
Power supply carries out line to be introduced from J1, and piezo-resistance RV1 is for absorbing the voltage surge that may occur, fuse F1 is used for overcurrent protection.Inductance L 1, electric capacity C3, C4 common mode disturbances on filter out power incoming line, electric capacity C1 and C2 is then for filtering differential mode interference.Then, 1,3 ends AC power after filtering process being delivered to bridge rectifier B1 carry out full-wave rectification, become the direct current minus earth with ripple component, and positive pole is added in the drain electrode of main VMOS switching tube Q1 by the primary coil of high frequency transformer T1.The source electrode of main VMOS switching tube Q1 is by resistance R11 ground connection, and the pressure drop that Q1 operating current is formed through R1, as current sampling signal, delivers to PWM switch control chip IC2(SA7527) the 4th pin, for realizing the overcurrent protection of power tube; The grid of switching tube Q1 is controlled by IC2, is namely connected to the control output end (7 pin) of chip IC 2 by the parallel circuits of resistance R9, D3.1st pin of IC2 is adjustment voltage input end, and the voltage changing this pin gets final product the operating state of control chip.Correct because IC2 needs to realize PFC according to the DC pulse moving voltage waveform after inlet wire rectification, so the output (C5 upper end) of rectifier is sampled after dividing potential drop through resistance R2, R3 and R4, draw from dividing point (R4 upper end) and deliver to IC2 the 3rd pin.The switch drive of IC2 also needs the return-to-zero detecting magnetic flux in high frequency transformer, for this reason, the secondary coil (with the tie point of diode D5 positive pole) of high frequency transformer T1 is connected to IC2 the 5th pin by resistance R12.The power itself of IC2 is the 6th pin (negative pole) ground connection, and positive pole the 8th pin has two articles of current supply circuits, article one, take from rectifier bridge output point and C5 upper end+250V locates, the 8th pin is sent after resistance R5 and R6 step-down, apply for when powering up startup, another takes from the auxiliary power output end of high frequency transformer, i.e. the DC power anode VF place that provides after diode D5 rectification, resistance R15 and electric capacity C12 filtering of coil N3, send IC2 the 8th pin equally, as the long-term work power supply of IC2 after the normal starting of oscillation of circuit.The pulse current that switching tube Q1 work is formed is converted to after required voltage grade through transformer, exports, carries out secondary rectification by diode D2, after C11 smothing filtering, be sent to LED lamp through DC output end through secondary coil N2.
C output voltage current detection circuit is sampled for the voltage to direct current output, electric current, as the foundation of monitoring adjustment.Wherein the sampling of voltage is realized by divider resistance R21 and R22, they are connected across positive pole and export between negative pole GND2, dividing point (R22 upper end) is connected to " three end adjustable shunt reference voltage sources " IC4(TL431) reference electrode end, realize voltage sample; Be then come by the current sampling resistor R14 be connected in negative pole output loop to the sampling of electric current, the left end of R14 connects GND2, and right-hand member tie point is GND, GND is actual DC output end negative pole, therefore, the electric current flowing through load all through R14, thus must realize current sample.
The isolated constant voltage and current limiting closed loop feedback of D and protective loop; for the error signal after being amplified according to the sampled value in measure voltage & current loop; and this signal is transferred to PWM switch control chip by photoelectric coupler isolation, realize closed loop feedback to reach the constant voltage, the Current limited Control object that export direct current.Voltage and current error amplifier in the present embodiment is formed by " three end adjustable shunt reference voltage sources " TL431, and wherein IC4 serves as voltage error amplifier, and IC6, IC5 form current error amplifier jointly.
The symbol of TL431 and inner equivalent schematic diagram are as shown in Figure 3.As seen from the figure, TL431 can be equivalent to a high gain operational amplifier, and at the built-in accurate 2.5V source of stable pressure of the negative input end of amplifier, be provided with one at the output of amplifier and expand stream triode, the positive input terminal of amplifier is equivalent to the reference electrode of device, the collector electrode of above-mentioned expansion stream triode is equivalent to the negative electrode of device, and the emitter expanding stream triode is equivalent to the anode of device.When device by as the link of in closed feedback loop time, if the dividing point of aforementioned output voltage measure loop is connected to the reference electrode of TL431, when being namely connected to the positive input terminal of high gain operational amplifier, because the negative input end of high gain operational amplifier is stablized clamper in 2.5V voltage by internal precision source of stable pressure, theoretical according to closed loop adjustment, the virtual voltage that dividing point will inevitably be made to obtain is equal to 2.5V, then by the total voltage of dividing potential drop namely determine by the resistance of two divider resistances, that is, output voltage is defined in: U0/2.5V=(R21+R22)/R22.
The regulation process of voltage stabilizing loop
In the present embodiment, linear optical coupling OPT1 current transfer ratio is 1:1, has both isolated the electrical connection on primary and secondary both sides here, effectively can realize again the transmission of the useful signal of telecommunication between primary and secondary.Linear optical coupling OPT1 internal illumination pipe positive pole connects direct current output cathode end, and the negative pole of luminous tube is connected to the negative electrode of IC4, and the anode of IC4 meets GND2, forms the primary side of isolated controlling.When external condition changes or line component characteristic generation drift causes direct current output cathode terminal voltage to occur increasing trend, the voltage of R21 and R22 dividing point will depart from 2.5V and increase thereupon, because dividing point is connected on the input of the same name of amplifier, the output of amplifier is also tending towards raising, the built-in triode internal resistance of amplifier output reduces, the electric current flowing through optocoupler OPT1 light-emitting diode is increased, after light-coupled isolation transmission, to be tending towards increasing as terminal voltage on the resistance R16 of optocoupler secondary load, this change transfers to chip IC 2 the 1st pin through R7, after chip internal process, the driving pulse duty ratio that 7th pin exports reduces, Q1 electric current service time is caused to reduce, cause the direct current of the secondary D2 of high frequency transformer to export and be tending towards declining.The result of a series of like this closed loop regulation and control, will make VD keep stable.Otherwise, if when external condition changes or line component characteristic generation drift causes direct current output cathode terminal voltage to occur reduction trend, above-mentioned regulation process will present rightabout change, make VD keep stable equally.
The regulation process of current stabilization loop
In the present embodiment, the regulation process of current stabilization loop is slightly more more complex than the regulation process of voltage stabilizing loop.The controlling element IC5 of current stabilization loop is also " three end adjustable shunt reference voltage sources " TL431, identical with the controlling element IC4 of voltage stabilizing loop.The negative electrode of element IC5, IC4 is directly connected, be connected to the internal illumination pipe negative pole of optocoupler OPT1, the anode of IC5, IC4 is also directly connected with anode, be connected to the left end (GND2) that direct current exports sample resistance R14, can find out according to their this quite similar connections, their closed loop control process is also quite similar.Separately have a TL431(IC6) for generation of the reference voltage of a 2.5V, and after potentiometer W1 and resistance R19 dividing potential drop, create one relative to GND hold be slightly less than the voltage of 2.5V, and this voltage to be delivered on the reference edge of controlling element IC5 of current stabilization loop.Note, because sample resistance R14 is serially connected with output negative terminal, the direction that load current flows through sample resistance R14 is from right to left, is back to coil N2 lower end, if using GND end as real 0V reference point, left end (GND2) place of R14 is then the little negative voltage of a numerical value.(for example, suppose that R14 is 0.1 ohm, load current 2A, then the negative voltage at the left end GND2 place of R14 is :-2A × 0.1=-0.2V).If adjustment W1 makes the voltage of W1 and R19 dividing point reach 2.3V relative to GND, namely when the reference voltage terminal of IC5 is 2.3V, anode due to IC5 is connected on GND2 place, and its reference edge just reaches 2.5V relative to the voltage of anode, namely reaches starting to control a little of current stabilization or current limliting.If now external condition, load etc. changes or line component characteristic is drifted about, when causing output current to be tending towards increasing, GND2 holds the absolute value of negative pressure to be tending towards increasing, IC5 reference edge is made also to be tending towards increasing relative to the voltage of anode, this just causes creating regulation process very similar when raising with voltage stabilizing loop voltage, makes output current keep stable.
If situation is contrary, loads etc. change or line component characteristic generation drift causes output current to be tending towards reducing, then there are two kinds of possibilities, although a kind of IC5 of being reference edge is tending towards reducing relative to the voltage of anode, but still more than 2.5V fiducial value, at this moment under loop controls, output current continues to keep stable cut-off current; Another kind is that IC5 reference edge is decreased to below 2.5V fiducial value relative to the voltage of anode, and now IC5 exits control loop substantially, and circuit degradation is to the simple voltage stabilizing state being only controlled by IC4.
As can be seen from the above analysis, although the reference voltage 2.5V of IC4, IC5 is unalterable, as long as change the voltage ratio of R21, R22 in voltage sampling loop in the reasonable scope, the voltage stabilizing value of VD just can be changed easily; Equally, change the voltage ratio of W1, R19 in electric current comparison loop in the reasonable scope, just can change the cut-off current of average anode current easily.In the present invention, in this way, circuit structure should be innovated just, make LED driver under the management and control of microprocessor, the luminous power of light fixture can be adjusted as required.
E automatic control signal condition and performance element
This unit provides the power of driving to change in real time to LED lamp, and this change does not need additional any communication line or communication apparatus, can realize as long as receive in supply line that supporting adjustable alternating current steady voltage plug sends here.
As Fig. 1, in loop, J3 introduces the ac voltage signal after anti-interference filtration, after series resistance R24, R25 current limliting, after full-bridge rectifier B2 rectification, electric capacity C21 smothing filtering, obtain the sampled signal be directly proportional to input supply voltage, after the suitable dividing potential drop of resistance R27, R28, send to A/D converter input 14 pin of microprocessor IC1, process for microprocessor.
Owing to also having full-bridge rectifier in major loop, also primary voltage sampled signal can be obtained from the DC output end of major loop full-bridge rectifier after suitable voltage division processing, but must consider to strengthen isolation, reduce the impact on major loop as far as possible, prevent from causing the condition of work of major loop and the change of operating state.
The working power of microprocessor takes from the N3 coil of aforementioned high frequency transformer, after diode D6 rectification, electric capacity C10 smothing filtering, obtains the DC auxiliary supply of about 15V, ensureing that microprocessor power supply is stablized, being provided with for reducing ripple interference
linear three terminal regulator IC3(78L05), C17, C18 are respectively input, output filter capacitor,
iC3+ 5V the voltage exported delivers to power supply of microprocessor pin 20 pin.Electric capacity C9, resistance R23 connect and access between+5V accessory power supply and GND1, and it is connected in series and a little send microprocessor reset pin 1 pin.7th pin of microprocessor, the 6th pin are connected respectively to the negative pole of the interior light emitting diodes of optocoupler OPT2 and optocoupler OPT3, and the positive pole of these two light-emitting diodes is then connected to+5V power end respectively by resistance R29, R30.The collector electrode of the inner phototriode of optocoupler OPT2 is connected to through series resistance R31 on the reference electrode of aforementioned three end adjustable shunt reference voltage source IC4, and the collector electrode of the inner phototriode of optocoupler OPT3 is also connected on the reference electrode of IC4 through series resistance R32; The emitter of the inner phototriode of optocoupler OPT2 is directly connected with the emitter of the inner phototriode of optocoupler OPT3, is jointly connected to the anode (GND2) of IC4.As seen from Figure 1, directly be parallel on resistance R22 after phototriode series connection in resistance R31 and OPT2, also be directly be parallel on resistance R22 after phototriode series connection in resistance R32 and OPT3, utilize the switch control rule to two optocouplers, R31, R32 can be made in parallel with resistance R22 with 4 kinds of different compound modes, also just indirectly change the voltage ratio of output voltage sampling, and then achieve the adjustment of output voltage is controlled.
Concrete, when microprocessor I/O output pin only has the 7th pin to be low level, the luminous tube electrified light emitting of OPT2, inner phototriode conducting, R31 quilt is also received on R22, and R22 resistance is reduced, and voltage ratio increases, and output dc voltage rises; In like manner, when microprocessor I/O output pin only has the 6th pin to be low level, R32 quilt is also received on R22, R22 resistance is reduced, the resistance of choose reasonable R31, R32, make both resistances inconsistent, dividing potential drop can be made to obtain 4 grades of applicable numerical value, namely obtain four kinds of different LED power.
Other pin of microprocessor, wherein the 10th pin with being connected to power supply (GND1), and the 2nd pin RXD, the 3rd pin TXD are used for microprocessor down load application program, connect crystal oscillator JT1, for microprocessor provides work clock between the 4th, the 5th pin.
Send to the primary voltage sampled signal of A/D converter input 14 pin of microprocessor IC1, carry out analog-to-digital conversion in the microprocessor, then by processor, converting result data is analyzed.Because the concentrated pressurizer of primary voltage by auxiliary work provides, not only operating voltage can be adjusted as requested, and can ensure that operating voltage keeps invariable in setting range.Every platform LED driver, according to the analysis to A/D transformation result, can calculate the intention at Lighting control center, and then adopts preceding method to realize the control to lamp power by backward output channel.
Claims (9)
1. the LED drive circuit in supply line, is characterized in that comprising:
Inlet wire signal processing unit, receives power supply inlet wire signal, carries out two-way anti-interference filtration and exports city's signal of telecommunication; The described city signal of telecommunication is converted to the DC signal containing ripple component and exports;
Single-stage PFC flyback switch transition unit, receives described DC signal and city's signal of telecommunication, carries out pwm pulse modulation, then after high frequency transformer step-down process and secondary rectifying and wave-filtering, obtains low-voltage dc signal and export;
Automatic control signal condition and performance element, receive described DC signal and city's signal of telecommunication, and the electric characteristic according to supply line generates the driving power signal of change in real time and exports this signal;
Output voltage current detecting unit, receive described low-voltage dc signal and driving power signal, the signal of described reception is obtained current sampling data and voltage sample value by the resitstance voltage divider being connected on sampling resistor in direct current output loop, DC output end is arranged respectively accordingly, and electric current, voltage sample value are again through amplifying the backward described single-stage PFC flyback switch transition unit output feedback ontrol signal of process.
2. the LED drive circuit in supply line according to claim 1, characterized by further comprising isolated constant voltage and current limiting closed loop feedback unit, this unit accepts described feedback control signal and form error signal after amplifying, after more described error signal being closed road by linear optocoupler, send into single-stage PFC flyback switch transition unit, realize closed loop feedback.
3. the LED drive circuit in supply line according to claim 2, is characterized in that described single-stage PFC flyback switch transition unit comprises rectification, filter function block, flyback dc-dc converter and Active Power Factor Correction functional block,
Described Active Power Factor Correction functional block receives the DC signal that inlet wire signal processing unit exports, and carries out electric current and primary voltage same frequency homophase that copped wave makes inlet wire signal, exports the DC signal containing power frequency ripple component;
Described flyback dc-dc converter is used for carrying out pwm pulse modulation to the DC signal containing power frequency ripple component, obtain described second DC signal, again through high frequency transformer every straight and step-down process, after secondary rectifying and wave-filtering finally by described rectification, filter function block, obtain described low-voltage direct and export.
4. the LED drive circuit in supply line according to claim 3, it is characterized in that in described isolated constant voltage and current limiting closed loop feedback unit, feedback control signal is amplified by three error amplifier TL431 and is formed error signal, be respectively IC4, IC5, IC6, wherein IC4 is voltage error amplifier, IC6, IC5 forms current error amplifier jointly, IC4, IC5, the negative input end of IC6 is built-in with an accurate 2.5V source of stable pressure respectively, output is respectively arranged with one and expands stream triode, IC5, the negative electrode of IC4 is directly connected, be connected to the internal illumination pipe negative pole of optocoupler OPT1, IC5, the anode of IC4 is also directly connected with anode, be connected to one end that described direct current exports sampling resistor, the negative electrode of IC6 is connected to the internal illumination pipe positive pole of optocoupler OPT1 by divider resistance.
5. the LED drive circuit in supply line according to claim 4, is characterized in that described single-stage PFC flyback switch transition unit comprises PWM switch control chip IC2, diode D2, D3, D5, switching tube Q1, electric capacity C5, C11, and resistance R1, R2, R3, R4, R5, R6, R9, R11, the source electrode of R12, Q1 is by resistance R11 ground connection, and the pressure drop that Q1 operating current is formed through R1 is as current sampling signal, and deliver to 4 pin of IC2, for realizing the overcurrent protection of power tube, the grid of Q1 is controlled by IC2, by resistance R9, the parallel circuits of D3 is connected to 7 pin of IC2, and 1 pin of IC2 is adjustment voltage input end, and the output of described inlet wire signal processing unit is through resistance R2, R3 and R4 connects 3 pin of IC2 after sampling dividing potential drop, the positive pole of D5 is connected to 5 pin of IC2 by resistance R12,8 pin of IC2 pass through R5, the positive pole of R6 and C5 is connected, and the pulse current that Q1 work is formed carries out secondary rectification by diode D2 after transformation, then by after C11 smothing filtering, is sent to LED lamp through DC output end.
6. the LED drive circuit in supply line according to claim 4, it is characterized in that described output voltage current detecting unit comprises resistance R21 and resistance R22, the positive pole that R21, R22 are connected across the feedback control signal output of this unit exports between negative pole GND2, the dividing point of R22 upper end is connected with the reference electrode end of IC4, realizes voltage sample.
7. the LED drive circuit in supply line according to claim 6, it is characterized in that also comprising R14 in described output voltage current detecting unit, R14 is connected between the DC output end negative pole GND of negative pole GND2 and reality, realizes current sample.
8. the LED drive circuit in supply line according to claim 6, is characterized in that automatic control signal condition and performance element comprise microprocessor IC1, optocoupler OPT2, optocoupler OPT3, electric capacity C9, resistance R23, resistance R24, resistance R25, resistance R31, resistance R32, high frequency transformer, diode D6 rectification, electric capacity C10 the and be provided with+5V voltage that linear three terminal regulator IC3, IC3 export and deliver to 20 pin of IC1, electric capacity C9, resistance R23 connects and accesses between+5V accessory power supply and ground, and the tie point of series connection is connected with 1 pin of IC, 7 pin of IC1, 6 pin are connected to the negative pole of the interior light emitting diodes of optocoupler OPT2 and optocoupler OPT3 respectively accordingly, and the positive pole of these two light-emitting diodes is then respectively by resistance R29, R30 is connected to+5V power end, optocoupler OPT2, the collector electrode of the inner phototriode of OPT3 passes through R31 respectively accordingly, R32 is connected on the reference electrode of described IC4, and the emitter of the inner phototriode of optocoupler OPT2 is connected with the emitter of the inner phototriode of optocoupler OPT3, and is connected to the anode of IC4, R31, R32 respectively accordingly with OPT2, in parallel with R22 again after phototriode series connection in OPT3.
9. the LED drive circuit in supply line according to claim 1; it is characterized in that inlet wire signal processing unit comprises inductance L 1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, fuse F1 and rectifier circuit; described C1, C2 are connected across the two ends of L1 respectively; described C3, C4 serial connection is connected to the input of rectifier circuit again; serial connection point connects protecting field end; common mode disturbances on filter out power incoming line; described F1 is connected to inlet wire L and holds between the positive pole of C1, for overcurrent protection.
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| CN112087842A (en) * | 2019-05-27 | 2020-12-15 | 李宗凤 | Practical LED driver |
| CN112087842B (en) * | 2019-05-27 | 2024-04-26 | 李宗凤 | Practical LED driver |
| CN111014903A (en) * | 2020-01-06 | 2020-04-17 | 深圳市佳士科技股份有限公司 | Anti-interference switch signal processing circuit and welding and cutting equipment |
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Effective date of registration: 20200602 Address after: 211112 Longmian Avenue 568, Jiangning District, Nanjing City, Jiangsu Province (Jiangning High-tech Park) Patentee after: Nanjing ruibaote Electronic Technology Co., Ltd Address before: 226019 No. 51 Taiping North Road, Xuanwu District, Jiangsu, Nanjing Patentee before: NANJING SHEPOTAK ELECTRONIC EQUIPMENT Co.,Ltd. |