CN103929849B - Isolation led drive circuit - Google Patents
Isolation led drive circuit Download PDFInfo
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- CN103929849B CN103929849B CN201410116145.8A CN201410116145A CN103929849B CN 103929849 B CN103929849 B CN 103929849B CN 201410116145 A CN201410116145 A CN 201410116145A CN 103929849 B CN103929849 B CN 103929849B
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Abstract
The invention discloses isolation LED drive circuit, belong to the technical field that LED drives. Isolation LED drive circuit, comprise fly-wheel diode, transformer, auxiliary winding, power tube, detection resistance, constant-current controller, LED is connected with transformer primary side windings in series, fly-wheel diode is connected in reverse parallel in the two ends of the series arm being made up of LED, transformer primary side winding, power tube input is connected with transformer primary side winding, power tube output is through detecting resistance eutral grounding, and described auxiliary winding is serially connected in transformer secondary loop. Constant-current controller comprises: zero-crossing detector, the lowest point detector, peak detector, scale factor amplifier, switch control unit, integral unit, trsanscondutance amplifier, comparator, rest-set flip-flop. The present invention adopts " dutycycle mapping techniques ", has ensured the constant current accuracy of circuit under different loads.
Description
Technical field
The invention discloses isolation LED drive circuit, belong to the technical field that LED drives.
Background technology
At lighting field, light emitting diode (LED:LightEmittingDiode) illumination has become currentMain flow, the driving chip that LED is relevant also becomes the focus in IC design field, and drive circuitDesign level is but uneven, the constant current accuracy of domestic most driving chip can only accomplish ± and 5%, efficiency is generalLower, efficiency is generally between 70% to 90%, and the actuation techniques of real high-accuracy high-efficiency rate, slaps mostlyBe held in external several large company's hands, so in domestic LED driving field, be difficult to find power output to existIn 15-20W, efficiency is higher than 90%, and constant current accuracy is at ± 2% drive circuit, and the present invention is exactly for upperState deficiency, a LED constant-current control module of design.
LED type of drive is generally divided into isolation and non-isolation type, isolated form type of drive, and efficiency is difficult to break through90%, the present invention adopts non-isolation type to drive. The mode that realizes at present constant current adopts popular demagnetization mostlyTime becomes the structure of fixed proportion with the cycle, and this kind of structure is difficult to accomplish full voltage, high efficiency, maximum dutyThan being less than 50%, and power is difficult to break through 10W.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned background technology, and isolation LED is providedDrive circuit.
The present invention adopts following technical scheme for achieving the above object:
Isolation LED drive circuit, comprises fly-wheel diode, transformer, auxiliary winding, power tube, detectionResistance, LED is connected with transformer secondary windings in series, and fly-wheel diode is connected in reverse parallel in by LED, transformationThe two ends of the series arm of device secondary winding composition, power tube input is connected with transformer primary side winding, powerPipe output is through detecting resistance eutral grounding, and described auxiliary winding is serially connected in transformer secondary loop;
Described isolation LED drive circuit also comprises constant-current controller, and described constant-current controller comprises: zero passage inspectionSurvey device, the lowest point detector, peak detector, scale factor amplifier, switch control unit, integral unit,Trsanscondutance amplifier, comparator, rest-set flip-flop;
When described power tube turn-offs, transformer secondary winding starts demagnetization conducting, amplification place of scale factor amplifierThe detection resistive voltage peak value that reason peak detector detects, scale factor amplifier output signal is through switch controlUnit processed is input to integral unit, and integral unit extracts the DC component of switching pulse, and trsanscondutance amplifier is relatively openedThe DC component, the reference voltage that close pulse obtain the integration current of proofreading and correct, the integration that comparator positive input terminal is connected toElectric capacity produces gauge tap open-interval reference voltage under the integration current effect of proofreading and correct, and comparator is relatively controlledThe reference voltage of switch open time processed, the cut-off signals of sawtooth waveforms upset power output pipe;
In the time that the demagnetization of transformer secondary winding finishes, the transformer secondary winding that described zero-crossing detector detects disappearsMagnetic end signal is input to integral unit by switch control unit, and the lowest point detector is detecting power tube inputThe start signal of terminal voltage power output pipe at the bottom of lowest trough time;
Described rest-set flip-flop obtains the duty cycle signals of power tube according to the cut-off signals of power tube, start signal.
As further prioritization scheme of the present invention:
Switch control unit comprises the first switching tube, second switch pipe, with power tube control signal reverse firstMapping block, with zero passage detection signal the second mapping block in the same way, the first mapping block transformer secondary aroundWhen group starts demagnetization conducting, output makes the control signal of the first switching tube closure, and the second mapping block is at secondary windingWhen demagnetization finishes, output makes the control signal of second switch pipe conducting, wherein:
Rest-set flip-flop output described in described the first mapping block input termination, the first mapping block output terminationThe described first switch controlled utmost point,
Described the second mapping block input is taken over null detector output, and the second mapping block is exported described in terminationThe second switch management and control utmost point processed,
The described first switching tube input utmost point connects scale factor amplifier out, and the described second switch pipe input utmost point connectsThe first switching tube output stage, second switch pipe output stage ground connection.
The present invention adopts technique scheme, has following beneficial effect: power tube start-up time is at metal-oxide-semiconductorDrain electrode is in the moment of minimum voltage, by auxiliary winding, the voltage detecting of metal-oxide-semiconductor drain electrode is arrived to constant flow moduleValley floor detection module, and then open metal-oxide-semiconductor, instead of adopt the constant time lag of output after zero passage to openPseudo-" quasi-resonant mode ".
Brief description of the drawings
Fig. 1 is the embodiment that the present invention isolates LED drive circuit.
Fig. 2 is the block diagram that the present invention isolates LED drive circuit.
Number in the figure explanation: F1 is fuse, and RV is piezo-resistance, and L1, L2 are inductance, CX1, C0,C2, C3, C4, C5, C6, C7, C8, C9, C10 are electric capacity, and BR1 is rectifier bridge, R1A, R2AFor divider resistance, T1 is transformer, R0, R1, R2, R4, R5, R6, R9, R10, R11, R12,R14 is resistance, and D1, D2, D3 are diode, and U1 is CSC8810 chip, and NA is auxiliary winding,C is integrating capacitor, and SW0, SW1 are first, second switching tube, and Q1 is power tube.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical scheme of invention is elaborated:
As shown in Figure 2, the isolation LED drive circuit the present invention relates to, comprise fly-wheel diode, transformer,Auxiliary winding, power tube MOSFETN, detection resistance, LED is connected with transformer secondary windings in series,Fly-wheel diode is connected in reverse parallel in the two ends of the series arm being made up of LED, transformer secondary winding, powerPipe input is connected with transformer primary side winding, and power tube output, through detecting resistance eutral grounding, is assisted winding stringBe connected in transformer secondary loop, according to the constant current of LED peak value, the lowest point, the conducting of zero crossing power ratio control pipeController. Constant-current controller comprises: zero-crossing detector, the lowest point detector, peak detector, scale factor are putLarge device, switch control unit, integral unit are (by 10 groups of resistance R 0, capacitor C 0, resistance R 1, capacitor CBecome), trsanscondutance amplifier, comparator, rest-set flip-flop. Switch control unit comprises the first switching tube, and second opensGuan Guan, first mapping block reverse with power tube control signal, with the second mapping in the same way of zero passage detection signalModule, the first mapping block is exported and to be made the first switching tube closure in the time that transformer secondary winding starts demagnetization conductingControl signal, the second mapping block is exported the control letter that makes the conducting of second switch pipe in the time that the demagnetization of secondary winding finishesNumber, two mapping blocks have delay function. When MOSFETN turn-offs, transformer secondary winding starts to disappearMagnetic conductance is logical, makes the control signal of the first switching tube SW0 closure through the first mapping block output, and now theTwo switching tube SW1 turn-off, and scale factor amplifier output signal is input to integration through the first switching tube SW0Unit; In the time that the demagnetization of secondary winding finishes, secondary windings demagnetization end signal detected by zero-crossing detector,Make the control signal of second switch pipe SW1 conducting by the second mapping block output, and the first switching tube nowSW0 turn-offs, and now integral unit input end grounding, detects the leakage of MOSFETN by the lowest point detectorTerminal voltage is opened MOSFETN in time at the bottom of lowest trough.
Peak detector be responsible for detection power pipe detect resistance voltage, and the magnitude of voltage size reaction that detectsBe the electric current of LED, and in the time that switch turn-offs, preserve this voltage flow valuve, scale factor amplifier is responsible for peakThe magnitude of voltage that value detector detects amplifies processing, and the first mapping block is responsible in the time that the demagnetization of secondary winding startsBy the first switching tube SW0 closure, and now second switch pipe SW1 disconnects, and the second mapping block passes throughAuxiliary winding detects the zero crossing of secondary winding current, by second switch pipe SW1 closure, now first opensClose pipe SW0 and disconnect, so the voltage of scale factor amplifier output just changes V intoB×SW(nT),SW (nT) is duty cycle information, by DC voltage VBChanging peak value into is VB, low level is zero, and dutycycleWith the identical switching pulse signal of output duty cycle, then through second order passive low ventilating filter below,To correction voltage VD, trsanscondutance amplifier is by voltage VDWith reference voltage VREFCarry out, produce the integration electricity of proofreading and correctStream, discharges and recharges trsanscondutance amplifier GM external capacitor, and then produces while controlling MOSFETN unlatchingBetween reference voltage, the negative terminal of comparator C MP connects saw-toothed wave generator, in the time that MOSFETN closes, sawTooth ripple is output as zero, starts charging, when integrating capacitor C voltage exceedes V when MOSFETN opens momentCTime,Comparator C MP upset, closes MOSFETN. MOSFETN opens in the time that drain electrode is in minimum voltage,By auxiliary winding, the voltage detecting of MOSFETN drain electrode is arrived to the valley floor detection module of constant flow module, and thenOpen metal-oxide-semiconductor, instead of the puppet " quasi-resonant mode " that adopts the constant time lag after output zero passage to open.
One isolation LED drive circuit as shown in Figure 1. Between live wire, zero line, be connected to fuse F1, pressureThe holding circuit of quick resistance R V composition, inductance L 1, inductance L 2, capacitor C X1 composition prime filter circuit,Rectifier bridge BR1 input is connected on capacitor C X1 two-stage, and capacitor C 1 is connected on rectifier bridge BR1 output, resistanceR1A, resistance R 2A are composed in series bleeder circuit, the former limit of transformer T1 circuit be connected to resistance R 4, capacitor C 2,The clamp circuit of diode D1 composition, transformer T1 secondary circuit is connected to capacitor C 8, capacitor C 9, two utmost pointsThe filter circuit that pipe D3, resistance R 14 form. U1 (CSC8810 chip) is that this patent is corresponding to be drivenMoving circuit, PIN1 (CS) is current sample pin, in conjunction with the peak electricity of resistance R 7 resistance R 8 sampled power pipe Q1Stream; PIN3 (COMP) is compensation pin, and capacitor C 5 is integrating capacitor, in conjunction with capacitor C 6, capacitor C 7, electricityResistance R9 realizes the function of comparator; PIN4 (ZCS) the lowest point is detected and zero cross signal detection pin, in conjunction with resistance R 10,Resistance R 11, resistance R 12, realize the function of zero-crossing detector, the lowest point detector; PIN5 (VDD) power supplyPin is the confession of driving chip in conjunction with capacitor C 3, capacitor C 4, resistance R 2, diode D2, auxiliary winding NAElectricity; PIN6 (driver output) is through the grid of resistance R 5, resistance R 6 driven MOS pipes.
The electric current of inductance equals the output of LED, and owing to adopting metal-oxide-semiconductor zero level detection that drains, circuit is sureHaving certain electric current is zero Dead Time, and the size of Dead Time is with the line voltage change of load and inputAnd change, general circuit is set as constant time lag this time, and fixing time delay will cause output currentLine regulation and load regulation variation, so this circuit adopts output duty cycle mapping techniques, during dead bandBetween accurate recording, and be adapted in constant flow module.
LED output current can be used suc as formula (1) and calculate, wherein IOFor output current, IPKFor LEDPeak point current, TONFor the ON time of power tube, TDFor the erasing time of energy storage inductor.
Can be found out by formula (1), want to realize constant current, must ensure that both products are constant, generally establishMeter mode is constant peak electric current, and dutycycle is set as to fixed proportion, and the present invention adopts dutycycle mapping skillArt. The variation of monitoring output loading and input voltage, follows the tracks of duty cycle information in time in real time, and specific algorithm is as follows,
VB＝VCS×K(2)，
VC＝VB×SW(nT)(3)，
VD＝∫VCdt(4)，
IE＝(VD-VREF)×gm(5)，
VE＝∫IEdt/C(6)，
Wherein, RCSFor sampling resistor, VBFor LED current peak detected value VCSRevise the output after K times,VCFor the signal obtaining after switch element is processed, now by DC voltage VBChanging peak value into is VB, lowLevel is zero and dutycycle and the identical switching pulse signal of output duty cycle, by fourier expansion formulaCan calculate, now the DC component of switching pulse signal is VB× D, D is dutycycle SW (nT), and fromThe mode of extracting DC component in signal adopts low pass filter exactly, and low pass filter is originally as integrator, logicalCross the DC component V that the signal after integration is switching pulseD。
VD＝VB×(TON+TD)/TS(7)，
VDCompare generation correcting current with reference voltage, integration current IEIntegration electricity with trsanscondutance amplifierHold C and form the Superlow-pass filter that bandwidth is 10Hz, output control switch open-interval reference voltage VE，VEFor the DC voltage of stable output, it is 0 and the fixing triangular wave of slope that sawtooth waveforms module produces low level,When triangular wave rises to VETime, CMP output switching activity, closes output mos pipe.
From above-mentioned analysis can show that circuit is stable, VREFLevel must equal VDIf both are just not identicalCan produce correcting current, continue the opening time of metal-oxide-semiconductor to adjust, until both current potentials are identical.So can draw:
VD＝VREF(8)，
VREF＝VD＝VB×(TON+TD)/TS＝IPK×RCS×K×(TON+TD)/TS(9)，
Can be drawn by (9) formula:
IPK×(TON+TD)/TS＝VREF/RCS(10)，
If K=1, so:
IPK×(TON+TD)/TS＝VREF/RCS(11)，
And then draw output current:
Io＝1/2×(VREF/RCS)(12)，
Identical with general constant current expression formula, but the mode realizing is completely different.
Wherein VREFDefinite value, RCSExternal sampling resistance.
Wherein scale factor K is correction factor, by the size of amendment K, can make the voltage of sampling resistorMeeting under the prerequisite of the normal work of all modules, as much as possible little, and then reduce the consumption of external sampling resistance.
The power tube start-up time of the present invention's design is in the moment of minimum voltage in metal-oxide-semiconductor drain electrode, by auxiliaryHelp winding the voltage detecting of metal-oxide-semiconductor drain electrode to be arrived to the valley floor detection module of constant flow module, and then open MOSPipe, instead of the puppet " quasi-resonant mode " that adopts the constant time lag after output zero passage to open, the present invention adopts and " accounts forEmpty than mapping techniques ", ensure the constant current accuracy of circuit under different loads.
Claims (2)
1. isolation LED drive circuit, comprises fly-wheel diode, transformer, auxiliary winding, power tube, inspectionMeasuring resistance, LED is connected with transformer secondary windings in series, and fly-wheel diode is connected in reverse parallel in by LED, changeThe two ends of the series arm of depressor secondary winding composition, power tube input is connected with transformer primary side winding, meritRate pipe output is through detecting resistance eutral grounding, and described auxiliary winding is serially connected in transformer secondary loop;
It is characterized in that: described isolation LED drive circuit also comprises constant-current controller, described constant-current controllerComprise: zero-crossing detector, the lowest point detector, peak detector, scale factor amplifier, switch control unit,Integral unit, trsanscondutance amplifier, comparator, rest-set flip-flop;
When described power tube turn-offs, transformer secondary winding starts demagnetization conducting, amplification place of scale factor amplifierThe detection resistive voltage peak value that reason peak detector detects, scale factor amplifier output signal is through switch controlUnit processed is input to integral unit, and integral unit extracts the DC component of switching pulse, and trsanscondutance amplifier is relatively openedThe DC component, the reference voltage that close pulse obtain the integration current of proofreading and correct, the integration that comparator positive input terminal is connected toElectric capacity produces gauge tap open-interval reference voltage under the integration current effect of proofreading and correct, and comparator is relatively controlledThe reference voltage of switch open time processed, the cut-off signals of sawtooth waveforms upset power output pipe;
In the time that the demagnetization of transformer secondary winding finishes, the transformer secondary winding that described zero-crossing detector detects disappearsMagnetic end signal is input to integral unit by switch control unit, and the lowest point detector is detecting power tube inputThe start signal of terminal voltage power output pipe at the bottom of lowest trough time;
Described rest-set flip-flop obtains the duty cycle signals of power tube according to the cut-off signals of power tube, start signal.
2. isolation LED drive circuit according to claim 1, is characterized in that: described switch controlUnit comprises the first switching tube, second switch pipe, and first mapping block reverse with power tube control signal, withZero passage detection signal the second mapping block in the same way, the first mapping block starts demagnetization at transformer secondary winding leadsWhen logical, output makes the control signal of the first switching tube closure, and the second mapping block is defeated in the time that the demagnetization of secondary winding finishesThe send as an envoy to control signal of second switch pipe conducting, wherein:
Rest-set flip-flop output described in described the first mapping block input termination, the first mapping block output terminationThe described first switch controlled utmost point,
Described the second mapping block input is taken over null detector output, and the second mapping block is exported described in terminationThe second switch management and control utmost point processed,
The described first switching tube input utmost point connects scale factor amplifier out, and the described second switch pipe input utmost point connectsThe first switching tube output stage, second switch pipe output stage ground connection.
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| CN201410116145.8A CN103929849B (en) | 2014-03-26 | 2014-03-26 | Isolation led drive circuit |
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| CN201410116145.8A CN103929849B (en) | 2014-03-26 | 2014-03-26 | Isolation led drive circuit |
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| CN103929849B true CN103929849B (en) | 2016-05-25 |
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| CN104300945A (en) * | 2014-10-14 | 2015-01-21 | 上海贝岭股份有限公司 | Primary side feedback control power switch circuit |
| CN106787750B (en) * | 2016-12-19 | 2023-02-28 | 深圳市群芯科创电子有限公司 | Valley bottom opening control circuit under constant current state |
| CN108809261A (en) * | 2018-06-30 | 2018-11-13 | 国网江苏省电力有限公司连云港供电分公司 | Novel high speed current control amplifier for PZT multiple-level stack actuators |
| CN110277897B (en) * | 2019-07-15 | 2023-12-29 | 无锡硅动力微电子股份有限公司 | Constant current control circuit and switching power supply circuit |
| CN113659839B (en) * | 2021-07-16 | 2023-03-31 | 杭州电子科技大学 | Primary side current analog circuit of flyback converter and using device thereof |
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| CN101868094A (en) * | 2010-06-22 | 2010-10-20 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN103298215A (en) * | 2013-06-09 | 2013-09-11 | 浙江大学 | Control circuit of flyback LED (Light Emitting Diode) driver |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN203814007U (en) * | 2014-03-26 | 2014-09-03 | 无锡市晶源微电子有限公司 | Isolation led drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8884551B2 (en) * | 2012-01-13 | 2014-11-11 | Texas Instruments Incorporated | Flyback switching regulator with primary side regulation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101868094A (en) * | 2010-06-22 | 2010-10-20 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN103298215A (en) * | 2013-06-09 | 2013-09-11 | 浙江大学 | Control circuit of flyback LED (Light Emitting Diode) driver |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN203814007U (en) * | 2014-03-26 | 2014-09-03 | 无锡市晶源微电子有限公司 | Isolation led drive circuit |
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Address after: No. 5, Xijin Road, Xinwu District, Wuxi City, Jiangsu Province, 214000 Patentee after: Wuxi Jingyuan Microelectronics Co.,Ltd. Address before: Room 209, building a, block 106-c, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province, 214028 Patentee before: Wuxi Jingyuan Microelectronics Co.,Ltd. |