CN203761641U - LED drive device using adaptive reference constant-current source - Google Patents
LED drive device using adaptive reference constant-current source Download PDFInfo
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- CN203761641U CN203761641U CN201420001129.XU CN201420001129U CN203761641U CN 203761641 U CN203761641 U CN 203761641U CN 201420001129 U CN201420001129 U CN 201420001129U CN 203761641 U CN203761641 U CN 203761641U
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Abstract
An LED drive device using an adaptive reference constant-current source is provided. A sampling unit is connected with a sampling resistor which is connected in series with an LED illuminating lamp set end and acquires a sampling current set of the LED illuminating lamp set in a preset sampling time period. A filtering operation unit is connected with the sampling unit, receives the sampling current set and performs filtering, calculating and normalizing processing, acquires and locks reference current, and then outputs the reference current to an in-phase end of an operational amplifier. A reverse-phase end of the operational amplifier is connected with the sampling resistor. Through the reverse-phase end, the sampling current of the LED illuminating lamp set is obtained in real time. The operational amplifier compares the sampling current and the reference current, obtains a current difference, and outputs the current difference to a power drive unit for dynamic regulation of constant output current. The LED drive device utilizes the dynamic adaptive reference constant-current source to eliminate ripples, and the adaptive constant-current source takes an average value of the actual output current in the preset sampling time period as reference, and therefore a precise constant-current source is provided for the conventional LED illuminating lamp set with single-stage power factor correction.
Description
Technical field
The utility model relates to LED illumination constant-current source technical field, relates in particular to a kind of dynamic self-adapting benchmark constant current source LED drive unit.
Background technology
LED is efficient with it, energy-saving and environmental protection and the life-span is long etc. that advantage receives increasing concern.Because the luminous intensity of LED is determined by the size of current that flows through LED, and flow through the electric current of LED and the voltage exponent function relation at LED two ends, therefore, when the voltage at LED two ends has small variation, its electric current flowing through can produce larger variation.In order to guarantee that LED illuminator normally used, the electric current that guarantees to flow through LED is not subject to the impact of ripple voltage, and increase stable-pressure device need to LED illuminator be constant-current source device.
With reference to figure 1, the existing LED drive circuit schematic diagram that carries passive power factor corrective, the voltage of input, after rectification, voltage stabilizing, coupling, filtering etc. are processed, is exported constant electric current to LED.This circuit is in two-tube LED fluorescent lamp situation, to carry the LED drive circuit of power factor correction, can adopt MP4021A type isolation drive chip, and it has the driving force of the highest 50W.The value that is connected in parallel on the large capacitor C 0 that two-tube LED fluorescent lamp two ends strobe can be 8000uF.
With reference to figure 2, fixed reference constant current source LED driving circuit schematic diagram, it for to carry under the application conditions of Active PFC in Fig. 1, and the constant-current source of employing fixed reference reduces the circuit of output ripple electric current, D1-D8 totally 8 the LED illuminating lamps of having connected in circuit.Shown in number in the figure 21 part for the control action of primary side is converted to the schematic diagram of primary side, I
pEAKfor the peak value of this envelope electric current, I
aVAthe desired value of controlling for the namely constant current of mean value of this envelope electric current.Resistance R 1, capacitor C 3 and voltage-stabiliser tube D9 form voltage stabilizing circuit and power to amplifier U1A; Wherein the resistance of R1 is that 1K ohm, C3 are that its capacitance of nonpolarity electrochemical capacitor is 10uF, and the reference voltage of D9 is 5.1V.Capacitor C 2 is as by-pass capacitor, and adopting its capacitance of ceramic disc capacitor (Cap Ceramic) is 0.1 uF.Capacitor C 1 is as filtering capacitor, and adopting its capacitance of polarity electrochemical capacitor (Cap Pol3) is 1000 uF.Shown in number in the figure 22, part is the Local map of fixed reference constant-current source, the upper pressure drop producing of sampling resistor R3 is input to the end of oppisite phase of operational amplifier U1A, resistance R 2 and voltage-stabiliser tube D10 form in reference voltage circuit, the pressure drop of obtaining in resistance R 2 is input to the in-phase end of operational amplifier U1A, by operational amplifier U1A, compare to obtain voltage difference, and then by controlling the ON time of transistor Q1, LED illuminating lamp is carried out to constant current control; Wherein the resistance of R2 is 1K ohm, and the resistance of R3 is chosen as 40 ohm, and the reference voltage of D10 is 1.2V, and operational amplifier U1A adopts TLC27L2CP chip, and transistor Q1 adopts MOSFET-N transistor npn npn.
Referring to Fig. 3, the V-I curve chart of single-stage PFC constant-current LED lighting lamp, the output current scope that in figure, lines 31,33 are LED, the average current that lines 32 are LED; The current error of 3% left and right, may produce more than 30% voltage error as seen from the figure, if this voltage difference is added on the primary side constant-current source shown in Fig. 2 completely, will greatly lower efficiency, and produce a large amount of heat.And the fixed reference constant current source LED driving circuit shown in Fig. 2, error due to IC, MOSFET and transformer etc., the control action of primary side is converted to primary side general precision in 5% left and right, fixed reference constant-current source general precision is in 2% left and right, more than comprehensive, use fixed reference constant-current source to be connected on primary side and be used for constant current, maximum matching error may be up to 7%; The power consumption and the hear rate that have increased LED lamp assembly, be unfavorable for the raising of transformation efficiency.
Further, in actual use, due to temperature, the variation of the factors such as input voltage, the constant current being produced by AC-DC constant current source driving circuit may be drifted about, generally also between 2 ~ 5%, just drifting about and can on fixed reference constant-current source, produce larger pressure drop, cause almost unaffordable heat dissipation, the effect of negative drift meeting partial offset fixed reference constant-current source, serious meeting makes fixed reference constant-current source completely ineffective.
Utility model content
The purpose of this utility model is, a kind of self adaptation benchmark constant current source LED drive unit is provided, adopt dynamic self-adapting benchmark constant-current source to eliminate ripple circuit, the nominal error of fully evading AC-DC constant-current source, significantly reduce the ripple current of constant-current source, eliminate the flicker of LED light, solve the low and heating problem of common primary side constant-current source efficiency, for traditional single stage power factor correction LED lighting lamp group provides constant-current source accurately.
To achieve these goals, the utility model provides a kind of self adaptation benchmark constant current source LED drive unit, comprises sampling unit, filtering operation unit and operational amplifier; Described sampling unit joins with the sampling resistor that is serially connected in LED lighting lamp group end, for obtaining the sample rate current collection of LED lighting lamp group end in a default sampling time section; Described filtering operation unit and described sampling unit join, and for receiving described sample rate current collection and carrying out filtering, calculating and normalized, obtain the in-phase end that reference current locking export described operational amplifier to; Sampling resistor described in the anti-phase termination of described operational amplifier, by the sample rate current of end of oppisite phase Real-time Obtaining LED lighting lamp group end; The more described sample rate current of described operational amplifier and reference current, obtain difference between current and export a power drive unit to dynamic adjustments constant output current.
Optionally, when described LED drive unit works in AC-powered system, the integral multiple that described default sampling time section is the described AC-powered system half period.Optionally, described default sampling time section is greater than 5 times of described AC-powered system half period.
Optionally, the integral multiple that described default sampling time section is described sample rate current cluster sampling current cycle value.
Further, described reference current is the mean value of sample rate current collection in described default sampling time section.
Optionally, described filtering operation unit is further obtained the ripple coefficient in described default sampling time section, if described ripple coefficient surpasses predetermined threshold value, again obtains the in-phase end that reference current locking export described operational amplifier to.
The utility model has the advantage of, the utility model adopts dynamic self-adapting benchmark constant-current source to eliminate ripple circuit, it is benchmark that the mean value of presetting actual output current in sampling time section is take in adaptive constant-flow source, realized real constant current, the large ripple of output of having avoided one pole power factor correction and LED drive circuit to bring, has greatly improved the inherent flicker problem of LED; Compare with common primary side constant-current source and solved the low and heating problem of efficiency, for traditional one pole power factor correction LED illumination drives lamp group that constant-current source is accurately provided, and do not need the debugging of production process, facilitate large-scale production.
Accompanying drawing explanation
Fig. 1, the existing LED drive circuit schematic diagram that carries passive power factor corrective;
Fig. 2, fixed reference constant current source LED driving circuit schematic diagram;
Fig. 3, the V-I curve chart of single-stage PFC constant-current LED lighting lamp;
Fig. 4, self adaptation benchmark constant current source LED drive unit schematic diagram described in the utility model;
Fig. 5, self adaptation benchmark constant current source LED driving method flow chart described in the utility model;
Fig. 6, self adaptation benchmark constant current source LED drive unit described in the utility model one embodiment schematic diagram.
Embodiment
The embodiment of self adaptation benchmark constant current source LED drive unit the utility model being provided below in conjunction with accompanying drawing elaborates.
With reference to accompanying drawing 4, self adaptation benchmark constant current source LED drive unit schematic diagram described in the utility model, described self adaptation benchmark constant current source LED drive unit 10 comprises operational amplifier 11, sampling unit 12 and filtering operation unit 13.Self adaptation benchmark constant current source LED drive unit 10 described in the utility model is applied in the LED illumination constant-current system under pulsating direct current.
Described sampling unit 12 joins with the sampling resistor R1 that is serially connected in LED lighting lamp group 20 ends, for obtaining the sample rate current collection of LED lighting lamp group 20 ends in a default sampling time section t.
One power drive unit 14 is serially connected on sampling resistor R1, in described default sampling time section t, power drive unit 14 is in constant conducting state, also be that constant-current system is not worked, power drive unit 14 is straight-through, thus the electric current of 12 pairs of LED lighting lamp group 20 ends of sampling unit can freely sample the t time, obtain primary current, the locking as fiducial value of usining after subsequent treatment is input to operational amplifier 11, compares with normally the work electric current of Real-time Collection of constant-current system afterwards.
When described LED drive unit 10 works in AC-powered system, described default sampling time section t is the integral multiple of described AC-powered system half period.Such as, in 50Hz AC-powered system, t can be the integral multiple of 10ms or 10ms; In 60Hz AC-powered system, t can be 8.3ms or its integral multiple.As preferred embodiment, described default sampling time section t is greater than 5 times of described AC-powered system half period, to take into account required precision and cost control.
When described LED drive unit 10 works in the LED illumination constant-current system of artificial regulatory state or when the operating frequency of power supply system cannot obtain in advance, described default sampling time section t is the integral multiple of described sample rate current cluster sampling current cycle value.The cycle that the Current calculation that described filtering operation unit 13 gathers according to sampling unit 12 obtains sample rate current, and then definite sampling time section t, sampling unit 12 is sampled according to determined sampling time section t, obtains sample rate current collection.Sampling time, section t can be set to the integral multiple in sample rate current cycle; Preferably, sampling time section t can be set as being greater than 5 times of sample rate current cycle.
Described filtering operation unit 13 is joined with described sampling unit 12, for receiving described sample rate current collection and carrying out filtering, calculating and normalized, obtains the in-phase end 113 that reference current locking export described operational amplifier 11 to.The real-time current of follow-up LED lighting lamp group 20 ends that obtain of operational amplifier 11 all compares with the reference current of this locking, to realize constant current.
Described filtering operation unit 13 can become the concentrated current conversion of sample rate current after corresponding frequencies, carries out filtering, calculating and normalized, obtains the mean value of sample rate current collection as reference current.If reference current is digital quantity, reference current is carried out exporting after simulated conversion; If reference current is analog quantity, direct Buffer output.Described filtering operation unit 13 can be carried out analog-to-digital conversion by the concentrated electric current of sample rate current, by after analog quantity digitlization, carry out digital filtering, calculating and normalized, obtain the digitlization mean value of sample rate current collection as reference current, then the reference current of digital quantity is carried out exporting after analog-to-digital conversion.Described filtering operation unit 13 can go out corresponding voltage according to the concentrated electric current correspondence of sample rate current, and voltage transitions is become after corresponding duty ratio, carries out filtering, calculating and normalized, obtains reference voltage, then converts corresponding reference current locking output to.
After reference current is determined, sampling resistor R1, operational amplifier 11 and power drive unit 14 have formed a typical constant-current source generator, reference voltage/sampling resistor R1 resistance of electric current I=operational amplifier 11 in-phase ends 113.Sampling unit 12 and filtering operation unit 13 enter the monitoring mode of locking reference current, when electric current is no more than setting threshold, be output as aforementioned constant reference current lock value, power drive unit 14 output constant current values, be subject to the impact of loop gain, bandwidth, in the electric current of output, also have some alternating components.At this moment, filtering operation unit 13 continues to obtain sampled data from sampling unit 12, from these data, can obtain the value of mean value and change, in default sampling time section, must have max min, the ratio of this maximum or minimum value and mean value is called ripple coefficient.
At LED illumination constant-current system, there is larger variation, when described filtering operation unit 13 gets ripple coefficient more greatly over predetermined threshold value, the sampling unit 12 of device described in the utility model re-starts obtaining of sample rate current collection, the sample rate current collection of 13 pairs of Real-time Obtainings of filtering operation unit carries out the filtering of Preset Time section, computing, again obtains the in-phase end 113 that new reference current locking export described operational amplifier 11 to.In other performance, during the work of LED illumination constant-current system, when the temperature of chip internal surpasses preset temperature threshold value, also can re-start obtaining of sample rate current collection, and then redefine reference current locking output; Or at drive unit, move after a Preset Time section, re-start obtaining of sample rate current collection, and then redefine reference current locking output.
The end of oppisite phase 112 of described operational amplifier 11 meets described sampling resistor R1, by the sample rate current of end of oppisite phase 112 and sampling resistor R1 Real-time Obtaining LED lighting lamp group 20 ends.The more described sample rate current of described operational amplifier 11 and reference current obtain difference between current, by output 111, export the power drive unit 14 of connecting with described sampling resistor R1 to dynamic adjustments constant output current.
Described power drive unit 14 can be a transistor or a metal-oxide-semiconductor.According to the difference between current of input, control ON time and then the dynamic adjustments constant output current of transistor or metal-oxide-semiconductor.Wherein, described power drive unit 14 can be integrated on same chip with operational amplifier 11, sampling unit 12 and filtering operation unit 13, realizes adaptive constant-flow and drives; Described power drive unit 14 also can be arranged on separately the outside of self adaptation benchmark constant current source LED drive unit described in the utility model, and is connected with sampling resistor R1 and operational amplifier 11, realizes adaptive constant-flow and drives.
Self adaptation benchmark constant current source LED drive unit described in the utility model adopts dynamic self-adapting benchmark constant-current source to eliminate ripple circuit, it is benchmark that the reference current obtaining of sampling is in advance take in adaptive constant-flow source, fully avoided the error of constant-current source, solved the low and heating problem of efficiency, for LED lighting lamp group provides constant-current source accurately.
With reference to accompanying drawing 5, the flow chart of self adaptation benchmark constant current source LED driving method described in the utility model, described method adopts self adaptation benchmark constant current source LED drive unit described in the utility model.Below in conjunction with Fig. 4, Fig. 5, described method is elaborated.
S51: the sample rate current collection that obtains LED lighting lamp group end in a default sampling time section.In described default sampling time section t, constant-current system is not worked, the electric current of 12 pairs of LED lighting lamp group 20 ends of sampling unit can freely be sampled the t time, obtain primary current, as the fiducial value locking of usining after subsequent treatment is input to the in-phase end 113 of operational amplifier 11, compares with normally the work electric current of Real-time Collection of constant-current system afterwards.
When described LED drive unit 10 works in AC-powered system, described default sampling time section t is the integral multiple of described AC-powered system half period.As preferred embodiment, described default sampling time section t is greater than 5 times of described AC-powered system half period, to take into account required precision and cost control.When described LED drive unit 10 works in the LED illumination constant-current system of artificial regulatory state or when the operating frequency of power supply system cannot obtain in advance, described default sampling time section t is the integral multiple of described sample rate current cluster sampling current cycle value.The cycle that the Current calculation that described filtering operation unit 13 gathers according to sampling unit 12 obtains sample rate current, and then definite sampling time section t, sampling unit 12 is sampled according to determined sampling time section t, obtains sample rate current collection.Sampling time, section t can be set to the integral multiple in sample rate current cycle; Preferably, sampling time section t can be set as being greater than 5 times of sample rate current cycle.
S52: described sample rate current collection is carried out to filtering, calculating and normalized, obtain reference current locking output.Can the concentrated current conversion of sample rate current be become after corresponding frequencies by filtering operation unit 13, carry out filtering, calculating and normalized, obtain the mean value of sample rate current collection as reference current.If reference current is digital quantity, reference current is carried out exporting operational amplifier 11 to after simulated conversion; If reference current is analog quantity, directly Buffer output is to operational amplifier 11.Also can the concentrated electric current of sample rate current be carried out to analog-to-digital conversion by filtering operation unit 13, by after analog quantity digitlization, carry out digital filtering, calculating and normalized, obtain the digitlization mean value of sample rate current collection as reference current, then the reference current of digital quantity is carried out exporting operational amplifier 11 to after analog-to-digital conversion.
After reference current is determined, operational amplifier 11, power drive unit 14, sampling resistor R1 have formed a typical constant-current source generator, sampling unit 12 and filtering operation unit 13 enter the monitoring mode of locking reference current, when electric current is no more than setting threshold, be output as aforementioned constant reference current lock value.As preferred embodiment, described method further comprises: obtain the ripple coefficient in described default sampling time section, if described ripple coefficient surpasses predetermined threshold value, again obtain reference current locking output, to guarantee the precision of constant current.At LED illumination constant-current system output current, change greatly, or the temperature of chip internal is while surpassing preset temperature threshold value, or at drive unit, move after a Preset Time section, also can re-start obtaining of sample rate current collection, and then redefine reference current locking output.
S53: the sample rate current of Real-time Obtaining LED lighting lamp group end.End of oppisite phase 112 by described operational amplifier 11 meets sampling resistor R1, thereby by the sample rate current of end of oppisite phase 112 Real-time Obtaining LED lighting lamp group ends.
S54: more described sample rate current and reference current obtain difference between current, and determine output current according to the dynamic regulating constant of described difference between current.Described operational amplifier 11 compares the sample rate current receiving and reference current, obtains difference between current; By output 111, export power drive unit 14 to dynamic adjustments constant output current.Also, it is benchmark that the reference current obtaining of sampling is in advance take in adaptive constant-flow source, has fully avoided the error of constant-current source, has solved the low and heating problem of efficiency, for LED lighting lamp group provides constant-current source accurately.
Below in conjunction with Fig. 6, provide an embodiment of self adaptation benchmark constant current source LED drive unit described in the utility model.
With reference to accompanying drawing 6, self adaptation benchmark constant current source LED drive unit described in the utility model is applied in the LED illuminator under pulsating direct current.Described LED drive unit works in 50Hz AC-powered system.D1-D8 totally 8 the LED illuminating lamps of having connected in LED illuminator; Capacitor C 2 is as by-pass capacitor, and adopting its capacitance of ceramic disc capacitor (Cap Ceramic) is 10 uF; Capacitor C 1 is as filtering capacitor, and adopting its capacitance of polar capacitor (Cap Pol3) is 1000 uF.
Power drive unit adopts MOSFET-N transistor npn npn Q1, the anode of last LED illuminating lamp D8 of the drain electrode access LED lighting lamp group of transistor Q1, the source electrode of transistor Q1 is 10 ohm by its resistance of sampling resistor R1() ground connection, the output 111 of the grid access operational amplifier 11 of transistor Q1.
Described sampling unit 12 joins with described sampling resistor R1, for obtaining the sample rate current collection of LED lighting lamp group 20 ends in a default sampling time section t.In the present embodiment, described LED drive unit works in 50Hz AC-powered system, therefore described default sampling time section t can be the integral multiple of 10ms or 10ms.
In described default sampling time section t, transistor Q1 is in constant pass-through state, thereby the electric current of 12 pairs of LED lighting lamp group 20 ends of sampling unit can freely be sampled the t time, obtain primary current, the locking as fiducial value of usining after subsequent treatment is input to operational amplifier 11, compares with normally the work electric current of Real-time Collection of constant-current system afterwards.
In the present embodiment, described filtering operation unit 13 comprises AD conversion unit 131, digital conversion unit 132 and the D/A conversion unit 133 joining successively.
Described AD conversion unit 131 one end and described sampling unit 12 join, and the other end and described digital conversion unit 132 join, and described AD conversion unit 131 is for carrying out digitlization conversion by the sample rate current collection obtaining in t.The sample rate current obtaining by sampling resistor R1 due to sampling unit 12 integrates as analog quantity, also needs, by AD conversion unit 131, these analog quantitys are carried out to digitlization conversion, changes into the manageable data format in digital conversion unit 132.
Described digital conversion unit 132 joins with described D/A conversion unit 133, for the digitized sample rate current collection to received, carries out filtering, calculating and normalized, obtains reference current and inputs to described D/A conversion unit 133.In the described default sampling time section t in 132 pairs of the unit of digital conversion described in present embodiment, digitized sample rate current collection is averaged, thereby obtains described reference current.
Described D/A conversion unit 133 joins with the in-phase end 113 of described operational amplifier 11, for reference current being carried out to simulated conversion and exporting the in-phase end 113 of described operational amplifier 11 to.
Grid, the end of oppisite phase 112 that the output 111 of described operational amplifier 11 meets transistor Q1 connects port 114 ground protections that sampling resistor R1, in-phase end 113 connect described D/A conversion unit 133, described operational amplifier 11, and it is 2.2 uF that a capacitor C 3(capacitance was connected in another port 118) ground protection.The end of oppisite phase 112 of described operational amplifier 11 is by the sample rate current of sampling resistor R1 Real-time Obtaining LED lighting lamp group 20 ends.
Described operational amplifier 11 compares the sample rate current receiving and reference current, obtains difference between current and exports the grid of transistor Q1 to, to control the ON time of transistor Q1, thereby realizes dynamic adjustments constant output current.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1. a self adaptation benchmark constant current source LED drive unit, is characterized in that, comprises sampling unit, filtering operation unit and operational amplifier;
Described sampling unit joins with the sampling resistor that is serially connected in LED lighting lamp group end, for obtaining the sample rate current collection of LED lighting lamp group end in a default sampling time section;
Described filtering operation unit and described sampling unit join, and for receiving described sample rate current collection and carrying out filtering, calculating and normalized, obtain the in-phase end that reference current locking export described operational amplifier to;
Sampling resistor described in the anti-phase termination of described operational amplifier, by the sample rate current of end of oppisite phase Real-time Obtaining LED lighting lamp group end;
The more described sample rate current of described operational amplifier and reference current, obtain difference between current and export a power drive unit to dynamic adjustments constant output current.
2. according to the self adaptation benchmark constant current source LED drive unit described in claim 1, it is characterized in that, when described LED drive unit works in AC-powered system, the integral multiple that described default sampling time section is the described AC-powered system half period.
3. self adaptation benchmark constant current source LED drive unit according to claim 2, is characterized in that, described default sampling time section is greater than 5 times of described AC-powered system half period.
4. self adaptation benchmark constant current source LED drive unit according to claim 1, is characterized in that, described default sampling time section is the integral multiple of described sample rate current cluster sampling current cycle value.
5. self adaptation benchmark constant current source LED drive unit according to claim 1, is characterized in that, described reference current is the mean value of sample rate current collection in described default sampling time section.
6. self adaptation benchmark constant current source LED drive unit according to claim 1, it is characterized in that, described filtering operation unit is further obtained the ripple coefficient in described default sampling time section, if described ripple coefficient surpasses predetermined threshold value, again obtain the in-phase end that reference current locking export described operational amplifier to.
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| CN201420001129.XU CN203761641U (en) | 2014-01-02 | 2014-01-02 | LED drive device using adaptive reference constant-current source |
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| CN201420001129.XU CN203761641U (en) | 2014-01-02 | 2014-01-02 | LED drive device using adaptive reference constant-current source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702490A (en) * | 2014-01-02 | 2014-04-02 | 张洪为 | Self-adaptation standard constant current source LED (light emitting diode) driving device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103702490A (en) * | 2014-01-02 | 2014-04-02 | 张洪为 | Self-adaptation standard constant current source LED (light emitting diode) driving device and method |
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