CN205491273U - LED drive circuit in power supply line - Google Patents
LED drive circuit in power supply line Download PDFInfo
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- CN205491273U CN205491273U CN201521117934.XU CN201521117934U CN205491273U CN 205491273 U CN205491273 U CN 205491273U CN 201521117934 U CN201521117934 U CN 201521117934U CN 205491273 U CN205491273 U CN 205491273U
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Abstract
The utility model relates to a LED drive circuit in power supply line, include: inlet wire signal processing unit, single -stage PFC turn over and swash switch translation unit, automatic control signal conditioning and execution unit and output voltage current detection unit, inlet wire signal processing unit turns over through single -stage PFC respectively and swashs switch translation unit, automatic control signal conditioning and execution unit and output voltage current detection unit communication connection. The output voltage value of this circuit through concentrate the steady voltage power supply unit in reasonable within range adjustment is born control information on the power supply line, still keeps the steady voltage function under the new steady voltage value condition simultaneously.
Description
Technical field
The present invention relates to LED drive circuit, particularly relate to utilize lighting power supply line to also serve as lamp control information'sLED drive circuit.
Background technology
LED illumination technology achieves significant progress and development in recent years, with its highest luminous efficiency, impayable long-lived characteristic, excellent photochromic, the convenience of driving and flexible and by user favorable comment.Although once having dispute after a while at the initial stage introduced to the market, but perfect now by constantly developing, accepted by users the most rapidly, and welcome the climax of penetration and promotion.
LED illumination technology range of application is wide, it is possible not only to 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 the highest, the thermal losses of the energy can be greatly reduced, realize the green low-carbon environment-friendly in city illumination field, technology and equipment can also be controlled by introducing intelligent dimming, according to actual needs light intensity carried out in real time, manage control flexibly, excavate the economize on electricity potential of LED illumination technology further, and make city illumination reach higher intelligent level.
Wanting to be controlled light intensity, the most usual mode has two kinds:
One is to be preprogramed control mode, i.e. the relation curve of intended light intensity Yu time is made " illumination service chart ", and program downloads is in the embedded microprocessor in LED driver, then after powering up every day, light fixture is the most under control of the microprocessor, different lighting powers is selected according to residing different periods, follow strictly predetermined illumination service chart work the most automatically, this mode is simple and convenient, but must in advance lighting demand be carried out the most conscientious knowing the real situation, analyze and plan, after once programming determines, rethink amendment the most fairly cumbersome.
Another kind is real-time commitment mode, not only can above-mentioned " illumination service chart " be downloaded in the embedded microprocessor in LED driver by signal on-line normalization mode the most at any time, can also be according to specific demand, the work of manual intervention microprocessor at any time, and then change the running status of light fixture immediately, i.e. reach to depart from " illumination service chart " and the purpose that the most immediately manipulates.If the feedback information adding light fixture running status processes, could really deserve to be called the management of modern intelligentized illumination monitoring.
Above-mentioned the second controllable lighting management system has a feature clearly, i.e. need a set of information transmission loop carrying out real-time Communication for Power with embedded microprocessor, this set information transmission loop can be wired, such as power line carrier, RS485 industrial-controlled general line etc., can also 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 means all must be outside original lamp system at present, separately lay the communications cable or be equipped with wireless communication transmissions system equipment, and owing to communication system equipment is independently of each light fixture, and also must pass through such as 0-10V Control of Voltage interface, 4-20mA current loop between light fixture and control interface or other digital control interface and could be connected, it is achieved controlling in real time light fixture.
Summary of the invention
Present invention aim to overcome that the deficiency of above prior art, propose one and utilize lighting power supply line to also serve as 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 the most conventional various control methods, succinctly conveniently realize and LED luminaire for public lighting realized quick, real-time control, specifically realized by techniques below scheme:
DescribedIn supply line LED Drive circuitIncluding: inlet wire signal processing unit, single-stage PFC flyback switch converting unit, automatic control signal condition and performance element and output voltage current detecting unit, described inlet wire signal processing unit is communicated to connect with output voltage current detecting unit with performance element by single-stage PFC flyback switch converting unit, automatic control signal condition respectively.
DescribedIn supply line LED Drive circuitFurther design be, also include isolated constant voltage and current limiting closed loop feedback unit, described isolated constant voltage and current limiting closed loop feedback unit respectively with single-stage PFC flyback dc-dc converter, the communication connection of output voltage current detecting unit, form closed feedback loop.
DescribedIn supply line LED Drive circuitFurther design be, described isolated constant voltage and current limiting closed loop feedback unit includes three error amplifier TL431 and optocoupler OPT1, three error amplifiers are respectively IC4, IC5, IC6, wherein IC4 is voltage error amplifier, IC6, IC5 collectively forms current error amplifier, IC4, IC5, the negative input end of IC6 is built-in with an accurate 2.5V source of stable pressure respectively, outfan is respectively arranged with one and expands stream audion, IC5, the negative electrode of IC4 is joined directly together, it is connected to the internal illumination pipe negative pole of optocoupler OPT1, IC5, the anode of IC4 is also joined directly together with anode, it is connected to one end of described direct current output sampling resistor, the negative electrode of IC6 is connected to the internal illumination pipe positive pole of optocoupler OPT1 by divider resistance.
DescribedIn supply line LED Drive circuitnullFurther design be，Described single-stage PFC flyback switch converting unit includes 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、R12，The source electrode of Q1 passes through resistance R11 ground connection，The pressure drop that Q1 operating current is formed through R1 is as current sampling signal，Deliver to 4 feet of IC2，For realizing the overcurrent protection of power tube，The grid of Q1 is controlled by IC2，By resistance R9、The parallel circuit of D3 is connected to 7 feet of IC2，1 foot of IC2 is for adjusting voltage input end，The outfan of described inlet wire signal processing unit is through resistance R2、3 feet of IC2 are connected after R3 and R4 sampling dividing potential drop，The positive pole of D5 is connected to 5 feet of IC2 by resistance R12，8 feet of IC2 pass through R5、The positive pole of R6 with C5 is connected，The pulse current that Q1 work is formed is carried out secondary rectification by diode D2 after transformation，Again by after C11 smothing filtering，It is sent to LED lamp through DC output end.
DescribedIn supply line LED Drive circuitFurther design be, described output voltage current detecting unit includes resistance R21 and resistance R22, R21, R22 are connected across between positive pole output and the negative pole GND2 of the feedback control signal outfan of this unit, and the dividing point of R22 upper end is connected with the reference electrode end of IC4, it is achieved voltage sample.
DescribedIn supply line LED Drive circuitFurther design be, described output voltage current detecting unit also includes between the DC output end negative pole GND that resistance R14, resistance R14 are connected on negative pole GND2 and reality, it is achieved current sample.
DescribedIn supply line LED Drive circuitFurther design be, automatic control signal condition and performance element include microprocessor IC1, optocoupler OPT2, optocoupler OPT3, electric capacity C9, resistance R23, R24, R25, R31, R32, high frequency transformer, diode D6 rectification, electric capacity C10 and are provided with linear three terminal regulatorIC 3 , IC3null+ 5V the voltage of output delivers to 20 feet of IC1，Electric capacity C9、Resistance R23 connects and accesses between+5V accessory power supply and ground，The junction point of series connection is connected with 1 foot of IC，7 feet of IC1、6 feet are respectively correspondingly connected to the negative pole of the interior light emitting diodes of optocoupler OPT2 and optocoupler OPT3，The positive pole of these two light emitting diodes is the most respectively by resistance R29、R30 is connected to+5V power end，Optocoupler OPT2、The colelctor electrode of the internal phototriode of OPT3 respectively correspondingly passes through R31、R32 is connected on the reference electrode of described IC4，The emitter stage of the emitter stage phototriode internal with optocoupler OPT3 of the internal phototriode of optocoupler OPT2 is connected，And it is connected to the anode of IC4， R31、R32 respectively correspondingly with OPT2、Phototriode in OPT3 is in parallel with R22 again after connecting.
DescribedIn supply line LED Drive circuitFurther design be, inlet wire signal processing unit includes inductance L1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric fuse F1 and rectifier circuit, described C1, C2 are connected across the two ends of L1 respectively, and described C3, C4 concatenation is connected to the input of rectifier circuit againConcatenation point connects protecting field end,For filtering the common mode disturbances on power input line road, described F1It is connected to inlet wire L End with C1 Positive pole between,For overcurrent protection.
Advantages 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, on the one hand microprocessor is introduced, the electric parameter of incoming power is carried out continuously sampling analysis, identify that electric parameter changes the control information implied at any time, on the other hand the closed loop feedback at constant current constant voltage controls to introduce in loop adjustable interface, as required, microprocessor can carry out rapid structural parameter adjustment by this interface to driver output sample circuit, on the premise of a reference source is constant, it is achieved constant voltage, current limliting is adjusted the on-demand change of numerical value, thus reach to change the purpose adjusting lamp power.
The LED driver that the present invention relates to concentrate 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 concentrating voltage stabilizing power supply unit in the reasonable scope, control information is carried in supply line, still keeps the voltage stabilizing function under the conditions of new voltage stabilizing value 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 internal equivalent schematic diagram.
Detailed description of the invention
Below the present invention program is described in detail.
Such as Fig. 1, this LED drive circuit comprises: A inlet wire signal processing unit, B single-stage PFC flyback switch converting unit, C output voltage current detecting unit, D isolated constant voltage and current limiting closed loop feedback unit 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 converting unit, inlet wire filtering link carries out two-way anti-interference filtration, both the impact on driver of the electrical network clutter, the harmonic wave produced during the work of the driver for isolating internal electronic element again pollution to electrical network had been isolated.Civil power after filtered is converted to the unidirectional current containing ripple component in rectification link, it is provided that switch converting unit to single-stage PFC flyback, for realizing preparing the PFC of civil power input.Surge protection link is made up of some the surge protection element being 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 ", it is achieved DC-DC conversion and the isolation of first inter-stage.
PFC flyback dc-dc converter is the core component of LED driver.Single-stage PFC flyback dc-dc converter is to be simplified by two-stage PFC flyback dc-dc converter to form.Before traditional pfc circuit is typically scheduled at flyback switching converter circuit, the two forms series relationship, and wherein i.e. " APFC ", this technology carries out copped wave according to specific rule to the DC voltage that rectification link provides to PFC, outputContaining the DC signal of power frequency ripple component,Inlet wire current can be forced to reach and primary voltage is with frequency homophase, and waveform keeps consistent with inlet wire sinusoidal voltage waveform, is approximately the perfect condition of 1 realizing power factor；On the other hand flyback dc-dc converter unidirectional current after processing PFC level carries out pwm pulse modulation,Obtain the second DC signal,Again after high frequency transformer blood pressure lowering process and secondary rectifying and wave-filtering, obtain required low-voltage direct output, be a DC-DC translation process.
Two-stage PFC flyback dc-dc converter every grade is required for a power switch pipe, and " the single-stage PFC flyback dc-dc converter " that use here, it is then that the function of the two is combined together, utilize a power switch pipe to coordinate peripheral component, the function originally needing two power switch pipes to realize can be completed simultaneously.The particular architectures of circuit also eliminates a high-voltage electrolytic capacitor after rectification link for smothing filtering, and therefore, single-stage PFC flyback dc-dc converter simple in construction, power consumption is relatively low, makes equipment dependability improve, and the life-span is longer.But the requirement to power switch pipe and low-pressure side secondary rectifying and wave-filtering is higher.
C output voltage current detecting unit
It is approximately linear relationship between LED operating current and luminous intensity, and LED is very sensitive to the stability of running voltage, its reason is that its V-I characteristic curve is the biggest, small supply voltage change can cause the change greatly of electric current, additionally, LED not conventional, electric-resistance loads, its characteristic curve also can occur big horizontal displacement relatively along with variations in temperature, even if supply voltage is highly stable, cannot guarantee that electric current equi-stable, therefore, LED drive power does not merely have to the basic stabilizing voltage characteristic first with D.C. regulated power supply, also must have the ability of detection steady operation electric current simultaneously.Output voltage current detecting unit sets 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 electric current is then series connection sampling resistor in direct current output loop, and resistance terminal voltage is current sampling data.After two amplified process of sampled value, as feedback control signal, the output of PFC flyback dc-dc converter is controlled, reaches voltage stabilization and current stabilization purpose, also achieve the protection to equipment and light fixture simultaneously.
When load current is less than current stabilization threshold value, driver is run with voltage regulation way；And when load current reaches current stabilization threshold value or has more than current stabilization threshold value tendency, driver seamlessly transits to be run for current stabilization mode.It should be noted that, basic voltage stabilizing threshold value and current stabilization threshold value are set not only by adjusting respective potentiometer of adjusting, it is also possible to the amplification of the intrinsic standoff ratio or current sample treatment loop by changing above-mentioned resitstance voltage divider sets under micro-processor control.
D isolated constant voltage and current limiting closed loop feedback unit
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 on using is with convenient, reducing the interference signal harmful effect to complete machine stability, the ac power supply circuit of LED driver and direct current output loop must be entirely isolated.In order to constitute the closed loop feedback between output and input circuit, it is necessary to the isolation being realized control signal by the device of photo-coupler one class is transmitted.Here linear optocoupler is used, carry out closing road in optocoupler primary with current feedback signal by the voltage from error amplifier, and signal secondary obtained sends into the pwm chip of flyback dc-dc converter, export with the direct current of robust driver for changing parameter of its output pulse.
E automatic control signal condition and performance element
This unit is different from general LED driver, the power driven is provided to change in real time LED lamp, and this change need not additional any communication line or communication apparatus, can realize in the supply line that supporting adjustable alternating current steady voltage plug is sent here as long as receiving.
Automatic control signal condition and performance element are connected to power between input circuit and measure voltage & current loop, for controlling the constant pressure and flow threshold value of driver output according to the electric characteristic of supply line, and then complete to run LED lamp the management and control of power.Automatic control signal condition is embedded microprocessor with the core of performance element, the electric parameter of power supply input circuit is sampled by its forward path of this devices use, after processing with calculating by analysis, obtain being supplied to the driving power code of LED lamp, then actuator is driven by backward channel, constant voltage and current limiting closed feedback loop is carried out structure conversion, and then changes voltage sampling and current sampling value, complete LED lamp drives adjusting and regulating and controlling of power.
Below in conjunction with the embodiment in Fig. 2, describe the technology implementation situation of patent of the present invention in detail.
Wherein A inlet wire signal processing unit and B single-stage PFC flyback dc-dc converter, these two parts are the ingredients of conventional single stage PFC flyback dc-dc converter.It is briefly described owing to belonging to the basis of known technology, only subsequent conditioning circuit.
Power supply carries out line to be introduced from J1, and varistor RV1 is for absorbing the voltage surge being likely to occur, and electric fuse F1 is used for overcurrent protection.Inductance L1, electric capacity C3, C4 are for filtering the common mode disturbances on power input line road, and electric capacity C1 Yu C2 is then used for filtering differential mode interference.Then, the alternating current power supply after Filtering Processing delivering to the 1 of bridge rectifier B1,3 ends carry out all wave rectification, become the unidirectional current minus earth with ripple component, 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 passes through 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 foot, be used for realizing the overcurrent protection of power tube；The grid of switching tube Q1 is controlled by IC2, is i.e. connected to the control output end (7 foot) of chip IC 2 by the parallel circuit of resistance R9, D3.1st foot of IC2 is for adjusting voltage input end, and the voltage changing this foot gets final product the duty of control chip.Owing to IC2 needs to realize PFC correction according to the DC pulse moving voltage waveform after inlet wire rectification, so by the output (C5 upper end) of commutator after resistance R2, R3 and R4 sampling dividing potential drop, drawing from dividing point (R4 upper end) and deliver to IC2 the 3rd foot.The switch drive of IC2 also needs to detect the return-to-zero of magnetic flux in high frequency transformer, to this end, the secondary coil (with the junction point of diode D5 positive pole) of high frequency transformer T1 is connected to IC2 the 5th foot by resistance R12.The power itself of IC2 is the 6th foot (negative pole) ground connection, and positive pole the 8th foot has two articles of current supply circuits, article one, take from rectifier bridge output point i.e. C5 upper end+250V place, the 8th foot is sent after resistance R5 and R6 blood pressure lowering, applying when electrically activating for adding, another takes from the DC power anode VF that the auxiliary power output end of high frequency transformer, i.e. coil N3 provide after diode D5 rectification, resistance R15 and electric capacity C12 filter, send IC2 the 8th foot 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, after transformator is converted to required voltage grade, exports through secondary coil N2, diode D2 carries out secondary rectification, after C11 smothing filtering, be sent to LED lamp through DC output end.
C output voltage current detection circuit is for sampling to the voltage of direct current output, electric current, as the foundation of monitoring adjustment.Wherein the sampling to voltage is realized by divider resistance R21 and R22, they are connected across between positive pole output and negative pole GND2, dividing point (R22 upper end) is connected to " three end adjustable shunt reference voltage sources " IC4(TL431) reference electrode end, it is achieved voltage sample；Sampling to electric current is then to be completed by the current sampling resistor R14 being connected in negative pole output loop, and the left end of R14 connects GND2, and right-hand member junction 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.
D isolated constant voltage and current limiting closed loop feedback and protective loop; error signal after being amplified according to the sampled value in measure voltage & current loop; and this signal is transmitted to PWM switch control chip by photoelectric coupler isolation, it is achieved closed loop feedback is to reach the constant voltage to direct current output, Current limited Control purpose.Voltage and current error amplifier in the present embodiment is constituted by " three end adjustable shunt reference voltage sources " TL431, and wherein IC4 serves as voltage error amplifier, and IC6, IC5 collectively form current error amplifier.
The symbol of TL431 and internal 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, outfan at amplifier is provided with one and expands stream audion, the positive input terminal of amplifier is equivalent to the reference electrode of device, the colelctor electrode of above-mentioned expansion stream audion is equivalent to the negative electrode of device, and the emitter stage expanding stream audion is equivalent to the anode of device.When device is by during as a link in closed feedback loop, if the dividing point of aforementioned output voltage measure loop being connected to the reference electrode of TL431, when being attached to the positive input terminal of high gain operational amplifier, owing to the negative input end of high gain operational amplifier is stablized clamper in 2.5V voltage by internal precision source of stable pressure, theory is adjusted according to closed loop, the virtual voltage that dividing point will necessarily be made to obtain is equal to 2.5V, then i.e. determined by the resistance of two divider resistances by the total voltage of dividing potential drop, 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, had the most both isolated the electrical connection on primary and secondary both sides, and can be effectively realized again the transmission of the useful signal of telecommunication of first inter-stage.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, constitutes the primary side that isolation controls.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 deviate from 2.5V and increases therewith, owing to dividing point is connected on the input of the same name of amplifier, the output of amplifier also tends to raise, the built-in audion internal resistance of amplifier outfan reduces, the electric current flowing through optocoupler OPT1 light emitting diode is increased, after light-coupled isolation is transmitted, to tend to increasing as terminal voltage on the resistance R16 of optocoupler secondary load, this change is transmitted to chip IC 2 the 1st foot through R7, after chip internal processes, the driving pulse dutycycle of the 7th foot output reduces, Q1 electric current service time is caused to reduce, the direct current output causing high frequency transformer secondary D2 tends to declining.The result of the most a series of closed loops regulation and control, will make VD keep stable.During whereas if external condition changes or line component characteristic generation drift causes direct current output cathode terminal voltage reduction trend occur, 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 more slightly 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 joined directly together, it is connected to the internal illumination pipe negative pole of optocoupler OPT1, the anode of IC5, IC4 is also joined directly together with anode, it is connected to the left end (GND2) of direct current output sample resistance R14, according to they this quite similar connections it can be seen that their closed loop control process is also quite similar.Separately have a TL431(IC6) for producing the reference voltage of a 2.5V, and after potentiometer W1 and resistance R19 dividing potential drop, create one relative to GND hold for be slightly less than the voltage of 2.5V, and this voltage is delivered on the reference edge of controlling element IC5 of current stabilization loop.Note, owing to sample resistance R14 is to be serially connected with output negative terminal, it is from right to left that load current flows through the direction of sample resistance R14, 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 negative voltage that a numerical value is little.(as an example it is assumed that R14 is 0.1 ohm, load current 2A, then the negative voltage at the left end GND2 of R14 is :-2A × 0.1=-0.2V).The voltage of W1 and R19 dividing point is made to reach 2.3V relative to GND if adjusting W1, when the reference voltage terminal of i.e. IC5 is 2.3V, owing to the anode of IC5 is connected at GND2, its reference edge has reached 2.5V relative to the voltage of anode, has i.e. reached 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 electric current to tend to increasing, the absolute value of GND2 end negative pressure tends to increasing, IC5 reference edge is made to also tend to increase relative to the voltage of anode, this results in and creates regulation process similar when raising with voltage stabilizing loop voltage, makes output electric current keep stable.
If situation is contrary, load etc. changes or line component characteristic generation drift is to cause exporting electric current to tend to reducing, then there are two kinds of possibilities, although a kind of IC5 of being reference edge tends to reducing relative to the voltage of anode, but still above 2.5V reference value, under loop control, at this moment export the cut-off current that electric current continues to keep stable；Another kind is that IC5 reference edge is decreased to below 2.5V reference value relative to the voltage of anode, and now IC5 essentially drops out control loop, 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, but as long as changing the intrinsic standoff ratio of R21, R22 in voltage sampling loop in the reasonable scope, it is possible to change the voltage stabilizing value of VD easily；Equally, the intrinsic standoff ratio of W1, R19 in electric current comparison loop is changed in the reasonable scope, it is possible to change the cut-off current of average anode current easily.In the present invention, should in this way circuit structure be innovated just, make LED driver can under the management and control of microprocessor the luminous power of on-demand adjustment light fixture.
E automatic control signal condition and performance element
LED lamp is provided the power driven to change in real time by this unit, and this change need not additional any communication line or communication apparatus, can realize in the supply line that supporting adjustable alternating current steady voltage plug is sent here as long as receiving.
Such as Fig. 1, in loop, J3 introduces the ac voltage signal after anti-interference filtration, after being concatenated resistance R24, R25 current limliting, after full-bridge rectifier B2 rectification, electric capacity C21 smothing filtering, obtain the sampled signal being directly proportional to input supply voltage, after the suitable dividing potential drop of resistance R27, R28, send to A/D converter input 14 foot of microprocessor IC1, process for microprocessor.
Owing to major loop also having full-bridge rectifier, primary voltage sampled signal can also be obtained after suitable voltage division processing from the DC output end of major loop full-bridge rectifier, but must take into reinforcement isolation, reduce the impact on major loop as far as possible, prevent from causing the change of the working condition of major loop and duty.
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, ensures that microprocessor power supply is stable for reducing ripple interference, is provided withLinear three terminal regulator IC3(78L05), C17, C18 are respectively input, outfan filter capacitor,IC3+ 5V the voltage of output delivers to power supply of microprocessor pin 20 foot.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 foot.7th foot of microprocessor, the 6th foot 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 connected to+5V power end by resistance R29, R30 the most respectively.The colelctor electrode of the internal phototriode of optocoupler OPT2 is concatenated resistance R31 and is connected on the reference electrode of aforementioned three end adjustable shunt reference voltage source IC4, and the colelctor electrode of the internal phototriode of optocoupler OPT3 is concatenated resistance R32 and is also connected on the reference electrode of IC4；The emitter stage of the emitter stage phototriode internal with optocoupler OPT3 of the internal phototriode of optocoupler OPT2 is joined directly together, and is jointly connected to the anode (GND2) of IC4.As seen from Figure 1, phototriode in resistance R31 with OPT2 is directly to be parallel on resistance R22 after connecting, phototriode in resistance R32 with OPT3 is also directly to be parallel on resistance R22 after connecting, utilize the on-off control to two optocouplers, R31, R32 can be made in parallel with resistance R22 with 4 kinds of different compound modes, the most indirectly change the intrinsic standoff ratio of output voltage sampling, and then achieve the control of the adjustment to output voltage.
Concrete, when only the 7th foot is low level to microprocessor I/O output pin, the luminous tube electrified light emitting of OPT2, internal phototriode conducting, R31 quilt is also received on R22, makes R22 resistance reduce, intrinsic standoff ratio increase, and output DC voltage rises；In like manner, when only the 6th foot is low level to microprocessor I/O output pin, R32 quilt is also received on R22, making R22 resistance reduce, rationally select the resistance of R31, R32, the resistance making both is inconsistent, dividing potential drop can be made to obtain 4 grades of applicable numerical value, i.e. obtained four kinds of different LED power.
Other pin of microprocessor, wherein the 10th foot with being connected to power supply (GND1), the 2nd foot RXD, the 3rd foot TXD for microprocessor being downloaded application program, the 4th, connect crystal oscillator JT1 between the 5th foot, provide work clock for microprocessor.
Send to the primary voltage sampled signal of A/D converter input 14 foot of microprocessor IC1, carry out analog digital conversion in the microprocessor, then by processor, converting result data is analyzed.Owing to primary voltage is provided by the concentration manostat of auxiliary work, not only running voltage can be adjusted as requested, and can ensure that running voltage keeps invariable in setting range.Every LED driver, according to the analysis to A/D transformation result, can calculate the intention at Lighting control center, and then use preceding method to realize the control to lamp power by backward output channel.
Claims (8)
1.In a kind of supply line LED Drive circuitIt is characterized in that including: inlet wire signal processing unit, single-stage PFC flyback switch converting unit, automatic control signal condition and performance element and output voltage current detecting unit, described inlet wire signal processing unit is communicated to connect with output voltage current detecting unit with performance element by single-stage PFC flyback switch converting unit, automatic control signal condition respectively.
The most according to claim 1In supply line LED Drive circuit, it is characterised in that also including isolated constant voltage and current limiting closed loop feedback unit, described isolated constant voltage and current limiting closed loop feedback unit communicates to connect with single-stage PFC flyback dc-dc converter, output voltage current detecting unit respectively, forms closed feedback loop.
The most according to claim 2In supply line LED Drive circuit, it is characterized in that described isolated constant voltage and current limiting closed loop feedback unit includes three error amplifier TL431 and optocoupler OPT1, three error amplifiers are respectively IC4, IC5, IC6, wherein IC4 is voltage error amplifier, IC6, IC5 collectively forms current error amplifier, IC4, IC5, the negative input end of IC6 is built-in with an accurate 2.5V source of stable pressure respectively, outfan is respectively arranged with one and expands stream audion, IC5, the negative electrode of IC4 is joined directly together, it is connected to the internal illumination pipe negative pole of optocoupler OPT1, IC5, the anode of IC4 is also joined directly together with anode, it is connected to one end of described output voltage current detecting unit, the negative electrode of IC6 is connected to the internal illumination pipe positive pole of optocoupler OPT1 by divider resistance.
The most according to claim 1In supply line LED Drive circuitnull，It is characterized in that described single-stage PFC flyback switch converting unit includes 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、R12，The source electrode of Q1 passes through resistance R11 ground connection，The pressure drop that Q1 operating current is formed through R1 is as current sampling signal，Deliver to 4 feet of IC2，For realizing the overcurrent protection of power tube，The grid of Q1 is controlled by IC2，By resistance R9、The parallel circuit of D3 is connected to 7 feet of IC2，1 foot of IC2 is for adjusting voltage input end，The outfan of described inlet wire signal processing unit is through resistance R2、3 feet of IC2 are connected after R3 and R4 sampling dividing potential drop，The positive pole of D5 is connected to 5 feet of IC2 by resistance R12，8 feet of IC2 pass through R5、The positive pole of R6 with C5 is connected，The pulse current that Q1 work is formed is carried out secondary rectification by diode D2 after transformation，Again by after C11 smothing filtering，It is sent to LED lamp through DC output end.
The most according to claim 3In supply line LED Drive circuitIt is characterized in that described output voltage current detecting unit includes resistance R21 and resistance R22, R21, R22 are connected across between positive pole output and the negative pole GND2 of the feedback control signal outfan of this unit, and the dividing point of R22 upper end is connected with the reference electrode end of IC4, it is achieved voltage sample.
The most according to claim 5In supply line LED Drive circuit, it is characterised in that described output voltage current detecting unit also include between the DC output end negative pole GND that resistance R14, resistance R14 are connected on negative pole GND2 and reality, it is achieved current sample.
The most according to claim 3In supply line LED Drive circuit, it is characterised in that automatic control signal condition and performance element include microprocessor IC1, optocoupler OPT2, optocoupler OPT3, electric capacity C9, resistance R23, R24, R25, R31, R32, high frequency transformer, diode D6 rectification, electric capacity C10 and are provided with linear three terminal regulatorIC3 , IC3null+ 5V the voltage of output delivers to 20 feet of IC1，Electric capacity C9、Resistance R23 connects and accesses between+5V accessory power supply and ground，The junction point of series connection is connected with 1 foot of IC，7 feet of IC1、6 feet are respectively correspondingly connected to the negative pole of the interior light emitting diodes of optocoupler OPT2 and optocoupler OPT3，The positive pole of these two light emitting diodes is the most respectively by resistance R29、R30 is connected to+5V power end，Optocoupler OPT2、The colelctor electrode of the internal phototriode of OPT3 respectively correspondingly passes through R31、R32 is connected on the reference electrode of described IC4，The emitter stage of the emitter stage phototriode internal with optocoupler OPT3 of the internal phototriode of optocoupler OPT2 is connected，And it is connected to the anode of IC4， R31、R32 respectively correspondingly with OPT2、Phototriode in OPT3 is in parallel with R22 again after connecting.
The most according to claim 1In supply line LED Drive circuitIt is characterized in that inlet wire signal processing unit includes inductance L1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric fuse F1 and rectifier circuit, described C1, C2 are connected across the two ends of L1 respectively, and described C3, C4 concatenation is connected to the input of rectifier circuit againConcatenation point connects protecting field end,For filtering the common mode disturbances on power input line road, described F1It is connected to inlet wire L End with C1 Positive pole between,For overcurrent protection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521117934.XU CN205491273U (en) | 2015-12-28 | 2015-12-28 | LED drive circuit in power supply line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521117934.XU CN205491273U (en) | 2015-12-28 | 2015-12-28 | LED drive circuit in power supply line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106376138A (en) * | 2016-10-24 | 2017-02-01 | 温州益泰光电有限公司 | Improved power circuit of LED lighting lamp |
| CN108469775A (en) * | 2018-06-29 | 2018-08-31 | 赵明 | One kind 4 ~ 20mA signal isolation circuits and multifunctional isolating transmitter |
| CN112179948A (en) * | 2020-09-29 | 2021-01-05 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
-
2015
- 2015-12-28 CN CN201521117934.XU patent/CN205491273U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106376138A (en) * | 2016-10-24 | 2017-02-01 | 温州益泰光电有限公司 | Improved power circuit of LED lighting lamp |
| CN106376138B (en) * | 2016-10-24 | 2018-03-02 | 温州益泰光电有限公司 | A kind of LED illumination lamp power circuit |
| CN108469775A (en) * | 2018-06-29 | 2018-08-31 | 赵明 | One kind 4 ~ 20mA signal isolation circuits and multifunctional isolating transmitter |
| CN108469775B (en) * | 2018-06-29 | 2023-11-28 | 赵明 | 4-20 mA signal isolation circuit and multifunctional isolation transmitter |
| CN112179948A (en) * | 2020-09-29 | 2021-01-05 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
| CN112179948B (en) * | 2020-09-29 | 2024-04-12 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
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Effective date of registration: 20200603 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: 210012 No. 51 Taiping North Road, Xuanwu District, Jiangsu, Nanjing Patentee before: NANJING SHEPOTAK ELECTRONIC EQUIPMENT Co.,Ltd. |