CN110536516A - A kind of digital control method of no electrolytic capacitor LED drive power - Google Patents

A kind of digital control method of no electrolytic capacitor LED drive power Download PDF

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CN110536516A
CN110536516A CN201910922367.1A CN201910922367A CN110536516A CN 110536516 A CN110536516 A CN 110536516A CN 201910922367 A CN201910922367 A CN 201910922367A CN 110536516 A CN110536516 A CN 110536516A
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circuit
pfc
output voltage
pfc circuit
power
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CN110536516B (en
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林国庆
陈伟
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Fuzhou University
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Fuzhou University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention relates to a kind of digital control methods of no electrolytic capacitor LED drive power.Digitial controller, which passes through acquisition pfc circuit output voltage and LED load electric current and carries out weighted feedback, realizes High Power Factor and constant current output, by acquiring Output Voltage in Rectified Circuits, the timing and duty ratio size of driving signal needed for LED load power determines half-bridge resonance circuit switch pipe, when PFC output voltage instantaneous value increases, the operative duty cycles of switching tube increase, when pfc circuit output voltage instantaneous value reduces, the operative duty cycles of switching tube reduce, the instantaneous value for enabling the operative duty cycles of half-bridge resonance circuit switch pipe to follow PFC output voltage automatically changes, to restrained effectively the low-frequency ripple of pfc circuit output voltage, reduce the capacity of pfc circuit output end storage capacitor, thin-film capacitor substitution electrolytic capacitor can be used, realize no electrolytic capacitor.

Description

A kind of digital control method of no electrolytic capacitor LED drive power
Technical field
The present invention relates to a kind of digital control methods of no electrolytic capacitor LED drive power.
Background technique
In recent years, LED technology is quickly grown, it because its energy conservation, the advantages that long-life and high light efficiency, are liked by masses deeply, at For lighting source of new generation.Since LED drive power needs the input of electrolytic capacitor balance and output power, and longevity of electrolytic capacitor The advantages of life increases with temperature and sharply declines, cannot give full play to the LED light long-life.Therefore development matches with LED light source Have high reliability, High Power Factor and the LED drive power of long-life it is essential.
For high-power applications occasion, the performance requirement of LED drive power generallys use two-level configuration, first order power because Number correcting circuit generallys use Boost circuit, and driving circuit is simple, and PF value is high, and total harmonic distortion is small, high-efficient.Second level DC/ DC converter generallys use half bridge resonant transformer, realizes the control of conversion and the constant current of electric energy, can work in higher frequency Rate range, while Sofe Switch may be implemented again.For the LED drive power with High Power Factor, AC-input voltage and electricity It is identical to flow phase, inputs containing twice of power frequency pulsation in instantaneous power, and output power is steady state value, size and input power Average value is equal.For the pulsating power between symmetrical alternating current input power and DC output power, usually in first order power The electrolytic capacitor of a factor correcting circuit outlet side large capacity in parallel, the capacitor generally use electrolytic capacitor.Electrolytic capacitor Service life often only has 10,000 hours or so, and the service life pole with LED 8~100,000 hours mismatches, and the service life of electrolytic capacitor Influenced by ambient temperature very big, temperature is every to increase 10 degree, and service life about reduces half, therefore electrolytic capacitor becomes influence The principal element in LED drive power service life, and electrolytic capacitor volume is larger, limits driving power power density and further mentions It is high.
Summary of the invention
The purpose of the present invention is to provide a kind of digital control methods of no electrolytic capacitor LED drive power, can be effective Ground inhibits the low-frequency ripple of pfc circuit output voltage, reduces the capacity of pfc circuit output end storage capacitor, can be used thin Membrane capacitance substitutes electrolytic capacitor, realizes no electrolytic capacitor.
To achieve the above object, the technical scheme is that a kind of no electrolytic capacitor LED drive power it is digital control Method, provides a no electrolytic capacitor LED drive power, including rectification circuit, pfc circuit, half-bridge resonance circuit, two paths of LED are equal Current circuit, control circuit;The half-bridge resonance circuit includes switching tube S1, S2, inductance L1, L2, capacitor C1, C2 and transformer T1, two paths of LED flow equalizing circuit include that equal galvanic electricity holds C3, diode D1, D2, capacitor C10, C20 and LED load LED1, LED2;It is whole Current circuit input terminal is connect with AC power source, and rectification circuit output end is connect with pfc circuit input terminal, and the first of pfc circuit is defeated One end connection of the connection of one end of outlet and S1, the second output terminal of PFC and one end of S2, one end of C2, T1 primary side, S1's is another One end is connected with the other end of S2 and the other end connection of one end through C1, L1 and L2, C2, the other end and the T1 primary side of L2 One end of other end connection, the cathode connection of anode of the one end on T1 pair side through C3 and D1, D2, the other end on T1 pair side and C20, The cathode connection of the anode of LED2, one end of C10, LED1, the anode connection of the other end, LED1 of the cathode and C10 of D1, D2's The cathode connection of the other end of anode and C20, LED2;The method implementation are as follows: control circuit passes through acquisition rectification circuit Control signal needed for output voltage, pfc circuit output voltage, LED load electric current, LED load voltage generate pfc circuit, and The instantaneous value for enabling the operative duty cycles of half-bridge resonance circuit switch pipe S1, S2 to follow pfc circuit output voltage automatically changes, To inhibit the low-frequency ripple of pfc circuit output voltage, reduce the capacity of pfc circuit output end storage capacitor.
In an embodiment of the present invention, the control circuit includes digitial controller and connect with the digitial controller Pfc circuit driving circuit and half-bridge resonance circuit drives circuit;The electricity of PFC required for digitial controller is generated by software programming Road driving signal and half-bridge resonance current driving signal, wherein pfc circuit driving signal is by acquiring pfc circuit output voltage It is weighted what feedback generated with LED load electric current and by them;Half-bridge resonance current driving signal is by acquiring rectified current Road output voltage, LED load power are simultaneously generated according to the control method that is mentioned, the duty ratio of the driving signal can automatically with Change with the instantaneous value of pfc circuit output voltage, to inhibit the low-frequency ripple of pfc circuit output voltage, it is defeated to reduce pfc circuit The capacity of outlet storage capacitor.
In an embodiment of the present invention, this method utilizes the constant-current characteristics of half-bridge resonance circuit, i.e., when half-bridge resonance circuit Work exports electric current in constant current resonance frequency:
i0=kc×vPFC×sin(D×π)
Wherein, vPFCFor pfc circuit output voltage instantaneous value, D is the operative duty cycles of S1, kcOnly to join with constant current resonance The related coefficients of number, i.e., when one timing of half-bridge resonance circuit resonance parameter, output electric current only with pfc circuit output voltage and half-bridge The operative duty cycles D of resonance circuit switching tube is related;When PFC output voltage instantaneous value increases, half-bridge resonance circuit upper switch The operative duty cycles of pipe increase, and export current instantaneous value i0=kc×vPFC× sin (D × π) increases;When PFC output voltage is instantaneous When value reduces, the operative duty cycles of half-bridge resonance circuit switch pipe reduce, and output current instantaneous value reduces, to solve LED The unbalanced problem of driving power input and output instantaneous power effectively inhibits the low-frequency ripple of pfc circuit output voltage, reduces The capacity of pfc circuit output end storage capacitor.
In an embodiment of the present invention, control circuit determines S1 by acquisition Output Voltage in Rectified Circuits, LED load power With the timing and duty ratio size of driving signal needed for S2, using Output Voltage in Rectified Circuits zero crossing as starting point, control The duty ratio of half-bridge resonance circuit withRule changes, wherein kdFor Duty ratio coefficient, DminThe minimum operative duty cycles of S1 when for nominal load;WhenWhen, D=kd×Dmin;When When,WhenWhen, D=0.5kd;Namely it is lighted from Output Voltage in Rectified Circuits zero passage, the work of S1 Make duty ratio by sinusoidal rule from DminIncrease to maximum value 0.5, then is reduced to DminUntil, complete a duty cycle, the work Make the half that the period is input ac power power frequency period;Switching tube S2 conducting complementary with S1, is both changed with sinusoidal rule.
In an embodiment of the present invention, the kdSelection by pfc circuit output voltage and bearing power depending on, work as load When power increases, duty ratio coefficient kdBigger, pfc circuit output end storage capacitor voltage reduces;When bearing power reduces, account for Sky compares coefficient kdSmaller, pfc circuit output end storage capacitor voltage increases.
In an embodiment of the present invention, the DminSelection by LED load voltage, pfc circuit output voltage maximum value It is determined with the peak-to-average force ratio of minimum value and LED load electric current.
Compared to the prior art, the invention has the following advantages: the present invention restrained effectively pfc circuit output electricity The low-frequency ripple of pressure reduces the capacity of pfc circuit output end storage capacitor, and thin-film capacitor substitution electrolytic capacitor can be used, real Existing no electrolytic capacitor.
Detailed description of the invention
Fig. 1 is no electrolytic capacitor LED drive power of the present invention and control principle drawing.
Fig. 2 is half-bridge LCL resonant network equivalent circuit diagram of the present invention.
Fig. 3 is no electrolytic capacitor LED drive power key operation waveforms of the present invention.
Fig. 4 is half-bridge resonance circuit switch pipe drive signal duty cycle work wave of the present invention.
Fig. 5 is Dmin=0.1, kdNo electrolytic capacitor LED drive power main simulation waveform when=1.
Fig. 6 is Dmin=0.2, kdNo electrolytic capacitor LED drive power main simulation waveform when=1.
Fig. 7 is Dmin=0.2, kdNo electrolytic capacitor LED drive power mainly emulates when=0.8.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of digital control methods of no electrolytic capacitor LED drive power, provide a no electrolytic capacitor LED drive power, including rectification circuit, pfc circuit, half-bridge resonance circuit, two paths of LED flow equalizing circuit, control circuit;Described half Bridge resonance circuit includes switching tube S1, S2, inductance L1, L2, and capacitor C1, C2 and transformer T1, two paths of LED flow equalizing circuit include equal Galvanic electricity holds C3, diode D1, D2, capacitor C10, C20 and LED load LED1, LED2;Rectification circuit input end and AC power source connect It connects, rectification circuit output end is connect with pfc circuit input terminal, and the first output end of pfc circuit and one end of S1 connect, PFC's One end connection of one end of second output terminal and S2, one end of C2, T1 primary side, the other end of S1 are connected simultaneously with the other end of S2 The other end of one end, C2 through C1, L1 and L2 connects, and the other end of L2 is connect with the other end of T1 primary side, the one end on T1 pair side The cathode of anode, D2 through C3 and D1 connects, the other end on T1 pair side and one end of C20, the anode of LED2, C10 one end, The cathode of LED1 connects, and the other end of the cathode of D1 and C10, the anode of LED1 connect, the other end of the anode of D2 and C20, The cathode of LED2 connects;Control circuit by acquisition Output Voltage in Rectified Circuits, pfc circuit output voltage, LED load electric current, Control signal needed for LED load voltage generates pfc circuit, and make the operative duty cycles of half-bridge resonance circuit switch pipe S1, S2 The instantaneous value of pfc circuit output voltage can be followed to change automatically, to inhibit the low-frequency ripple of pfc circuit output voltage, subtracted The capacity of small pfc circuit output end storage capacitor.
A kind of digital control method of no electrolytic capacitor LED drive power of the present invention, utilizes the constant current of half-bridge resonance circuit Characteristic, i.e., when half-bridge resonance circuit work in constant current resonance frequency, export electric current:
i0=kc×vPFC×sin(D×π)
Wherein, vPFCFor pfc circuit output voltage instantaneous value, D is the operative duty cycles of S1, kcOnly to join with constant current resonance The related coefficients of number, i.e., when one timing of half-bridge resonance circuit resonance parameter, output electric current only with pfc circuit output voltage and half-bridge The operative duty cycles D of resonance circuit switching tube is related;When PFC output voltage instantaneous value increases, half-bridge resonance circuit upper switch The operative duty cycles of pipe increase, and export current instantaneous value i0=kc×vPFC× sin (D × π) increases;When PFC output voltage is instantaneous When value reduces, the operative duty cycles of half-bridge resonance circuit switch pipe reduce, and output current instantaneous value reduces, to solve LED The unbalanced problem of driving power input and output instantaneous power effectively inhibits the low-frequency ripple of pfc circuit output voltage, reduces The capacity of pfc circuit output end storage capacitor.
The following are specific implementation processes of the invention.
Fig. 1 is two-stage type no electrolytic capacitor LED drive power of the embodiment of the present invention and its control principle drawing.Pfc circuit is adopted Use Boost;Half-bridge resonance electric routing switch pipe S1, S2, inductance L1, L2, capacitor C1, C2 and transformer T1 composition, half Bridge resonance circuit works at the constant current frequency of LCL resonant network.LED load is driven by two-way flow equalizing circuit, a routing D1, C10 and LED1 composition, another way are made of D2, C20 and LED2, and C3 is that the equal galvanic electricity of two paths of LED load is held.
Fig. 2 is half-bridge LCL resonant network equivalent circuit diagram, and input voltage is the square-wave signal that a duty ratio is D, and amplitude is Vin, working frequency f, Req are equivalent resistance of the LED load conversion to transformer primary side.Assuming that static exciter inductance Lm foot It is enough big, ignore its influence to load current.It is according to the fundametal compoment amplitude that fundamental Wave Analysis can obtain input voltageBeing derived by transactional analysis method can obtain: when resonance frequency of the half-bridge working frequency equal to inductance L1 and C2 Rate, i.e.,When, load currentkcFor only with The constant of half-bridge LCL resonant network relating to parameters, i.e., when the timing of resonant parameter one, output electric current only with half-bridge LCL resonant network Input voltage Vin(the i.e. output voltage v of pfc circuitPFC) related, it is unrelated with load resistance.Therefore work as half-bridge LCL resonant network The timing of input voltage one, constant current output may be implemented in half-bridge LCL resonant network, and resonant network input voltage is higher, load electricity Stream is bigger, conversely, load current is smaller.The present invention exactly utilize half-bridge LCL resonant network output electric current it is unrelated with load and with The characteristic of PFC output voltage variation realizes input instantaneous power by exporting the weighted feedback of electric current and PFC output voltage With the balance of output power and to the current constant control of LED load.
From figure 3, it can be seen that with AC-input voltage vacZero crossing is starting point, whenWhen, pfc circuit output electricity Pressure is in minimum value, whenWhen, pfc circuit output voltage is in maximum value.To inhibit pfc circuit output electricity as far as possible The ripple size of pressure, pfc circuit output voltage instantaneous value is bigger, and the operative duty cycles of half-bridge resonance circuit switch pipe are bigger;PFC Circuit output voltage instantaneous value is smaller, and the operative duty cycles of half-bridge resonance circuit switch pipe are smaller.Therefore half-bridge resonance circuit is opened After the minimum operative duty cycles Dmin of pass pipe is chosen at Output Voltage in Rectified Circuits zero passage(i.e.) position, maximum functional Duty ratio DmaxAfter being located at Output Voltage in Rectified Circuits zero passage(i.e.) position, due to half-bridge resonance circuit switch pipe Output power of operative duty cycles when being 0.5 it is maximum, therefore take Dmax=0.5.Due to Output Voltage in Rectified Circuits with exchange it is defeated Enter arc in phase, therefore using Output Voltage in Rectified Circuits zero crossing as starting point, controls the duty ratio of half-bridge constant current resonance circuit WithRule changes, wherein kdFor duty ratio coefficient (nominal load When kd=1), DminThe minimum duty cycle of half-bridge resonance circuit upper tube S1 when for nominal load.WhenWhen, D=kd×Dmin; WhenWhen,WhenWhen, D=0.5kd;Namely the Output Voltage in Rectified Circuits zero passage from It lights, the duty ratio of the upper tube S1 of half-bridge resonance circuit presses sinusoidal rule from DminIncrease to maximum value 0.5, then is reduced to DminFor Only, it completes a duty cycle, which is the half of input ac power power frequency period;Switching tube S2 is complementary with S1 to be led It is logical, both changed with sinusoidal rule;Duty ratio coefficient kdIt is related with bearing power and pfc circuit output voltage, when load function When rate increases, duty ratio coefficient kdBigger, pfc circuit output end storage capacitor voltage reduces;When bearing power reduces, duty Compare coefficient kdSmaller, pfc circuit output end storage capacitor voltage increases.Minimum duty cycle DminSelection by LED load voltage, The peak-to-average force ratio of pfc circuit maximum output voltage and minimum value and LED load electric current determines;
The control circuit of no electrolytic capacitor LED drive power is using digital control.Pfc circuit uses constant frequency DCM Working mould Formula realizes power factor emendation function, digitial controller by detection PFC output voltage and LED load electric current, and by they into Row weighted feedback generates the driving signal of BOOST converter switching tube, realizes High Power Factor, and by adjusting pfc circuit Output voltage realizes the current constant control to LED load.
Half-bridge resonance circuit is controlled using constant frequency PWM, and working frequency is located at constant current resonance frequency.Digitial controller passes through Driving signal needed for acquisition Output Voltage in Rectified Circuits, LED load power determine half-bridge resonance circuit switch pipe S1 and S2 Timing and duty ratio size.As shown in figure 4, the operative duty cycles of switching tube increase when PFC output voltage instantaneous value increases Add;When PFC output voltage instantaneous value reduces, the operative duty cycles of switching tube reduce, and make the work of half-bridge resonance circuit switch pipe Making duty ratio can follow the instantaneous value of PFC output voltage to change automatically, to restrained effectively pfc circuit output voltage Low-frequency ripple reduces the capacity of pfc circuit output end storage capacitor.
The present invention keeps LED load electric using the closed loop control method of PFC output voltage and LED load electric current weighting feedback Stream is kept constant, and has the advantages that constant current accuracy is high.Half-bridge resonance circuit is controlled using constant frequency, control is simple, convenient for transformer, The optimization design of inductance etc..
For the feasibility of access control scheme, the circuit and control strategy mentioned to the present invention is emulated.Emulation ginseng Number is as follows: AC-input voltage 220V, load current 2A, output voltage 70V, pfc circuit output end storage capacitor are adopted With the thin-film capacitor of 10uF.Simulation result is as follows: Fig. 5 Dmin=0.1, kdNo electrolytic capacitor LED drive power is main when=1 Simulation waveform, Fig. 6 Dmin=0.2, kdNo electrolytic capacitor LED drive power main simulation waveform when=1, Fig. 7 are this hair Bright Dmin=0.2, kdNo electrolytic capacitor LED drive power main simulation waveform when=0.8.As can be seen that pfc circuit output Storage capacitor is held to use the thin-film capacitor of 10uF, no electrolytic capacitor LED drive power is in Dmin=0.1, kd=1 and Dmin=0.2, kdIt can be worked normally when=1, for constant output current in 2A or so, AC input current can track AC sine input electricity Buckling, and the available effective control of the ripple of pfc circuit output voltage, can both meet pfc circuit output voltage AC-input voltage is consistently higher than to realize High Power Factor, and can inhibit pfc circuit output voltage peak value to reduce energy storage electricity Hold the voltage stress with switching tube.No electrolytic capacitor LED drive power is in Dmin=0.2, kdPfc circuit output voltage when=0.8 Peak value is close to 500V, therefore in DminOne timing, kdSmaller, the power for being transmitted to load is smaller, and PFC output voltage ripple is bigger. Comparing Fig. 5 and Fig. 6 can also be seen that in identical kdUnder value, minimum duty cycle DminValue is smaller, pfc circuit output voltage ripple Also smaller, output current ripple is bigger, and electric current peak-to-average force ratio increases.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.

Claims (6)

1. a kind of digital control method of no electrolytic capacitor LED drive power, which is characterized in that provide a no electrolytic capacitor LED Driving power, including rectification circuit, pfc circuit, half-bridge resonance circuit, two paths of LED flow equalizing circuit, control circuit;The half-bridge Resonance circuit includes switching tube S1, S2, inductance L1, L2, and capacitor C1, C2 and transformer T1, two paths of LED flow equalizing circuit include flowing Capacitor C3, diode D1, D2, capacitor C10, C20 and LED load LED1, LED2;Rectification circuit input end and AC power source connect It connects, rectification circuit output end is connect with pfc circuit input terminal, and the first output end of pfc circuit and one end of S1 connect, PFC's One end connection of one end of second output terminal and S2, one end of C2, T1 primary side, the other end of S1 are connected simultaneously with the other end of S2 The other end of one end, C2 through C1, L1 and L2 connects, and the other end of L2 is connect with the other end of T1 primary side, the one end on T1 pair side The cathode of anode, D2 through C3 and D1 connects, the other end on T1 pair side and one end of C20, the anode of LED2, C10 one end, The cathode of LED1 connects, and the other end of the cathode of D1 and C10, the anode of LED1 connect, the other end of the anode of D2 and C20, The cathode of LED2 connects;The method implementation are as follows: control circuit is defeated by acquisition Output Voltage in Rectified Circuits, pfc circuit Control signal needed for voltage, LED load electric current, LED load voltage generate pfc circuit out, and open half-bridge resonance circuit The operative duty cycles for closing pipe S1, S2 can follow the instantaneous value of pfc circuit output voltage to change automatically, to inhibit pfc circuit The low-frequency ripple of output voltage reduces the capacity of pfc circuit output end storage capacitor.
2. a kind of digital control method of no electrolytic capacitor LED drive power according to claim 1, which is characterized in that The control circuit includes digitial controller and the pfc circuit driving circuit and half-bridge resonance circuit that connect with the digitial controller Driving circuit;Pfc circuit driving signal required for digitial controller is generated by software programming and half-bridge resonance circuit drives Signal, wherein pfc circuit driving signal is by acquisition pfc circuit output voltage and LED load electric current and to be added them Power feedback generates;Half-bridge resonance current driving signal is by acquisition Output Voltage in Rectified Circuits, LED load power and basis What the control method mentioned generated, the duty ratio of the driving signal can follow the instantaneous value of pfc circuit output voltage to become automatically Change, to inhibit the low-frequency ripple of pfc circuit output voltage, reduces the capacity of pfc circuit output end storage capacitor.
3. a kind of digital control method of no electrolytic capacitor LED drive power according to claim 1 or 2, feature exist Utilize the constant-current characteristics of half-bridge resonance circuit in, this method, i.e., when the work of half-bridge resonance circuit is in constant current resonance frequency, output Electric current:
i0=kc×vPFC×sin(D×π)
Wherein, vPFCFor pfc circuit output voltage instantaneous value, D is the operative duty cycles of S1, kcIt is only related with constant current resonant parameter Coefficient, i.e., when the timing of half-bridge resonance circuit resonance parameter one, output electric current only with pfc circuit output voltage and half-bridge resonance electricity The operative duty cycles D of way switch pipe is related;When PFC output voltage instantaneous value increases, the work of half-bridge resonance circuit upper switch pipe Make duty ratio increase, exports current instantaneous value i0=kc×vPFC× sin (D × π) increases;When PFC output voltage instantaneous value reduces When, the operative duty cycles of half-bridge resonance circuit switch pipe reduce, and output current instantaneous value reduces, to solve LED driving electricity Input and output instantaneous power unbalanced problem in source effectively inhibits the low-frequency ripple of pfc circuit output voltage, reduces PFC electricity The capacity of road output end storage capacitor.
4. a kind of digital control method of no electrolytic capacitor LED drive power according to claim 3, which is characterized in that The timing of driving signal needed for control circuit determines S1 and S2 by acquisition Output Voltage in Rectified Circuits, LED load power And duty ratio size, using Output Voltage in Rectified Circuits zero crossing as starting point, control half-bridge resonance circuit duty ratio withRule changes, wherein kdFor duty ratio coefficient, DminIt is specified negative The minimum operative duty cycles of S1 when load;WhenWhen, D=kd×Dmin;WhenWhen,WhenWhen, D=0.5kd;Namely lighted from Output Voltage in Rectified Circuits zero passage, the operative duty cycles of S1 by sinusoidal rule from DminIncrease to maximum value 0.5, then is reduced to DminUntil, it completes a duty cycle, which is input ac power The half of power frequency period;Switching tube S2 conducting complementary with S1, is both changed with sinusoidal rule.
5. a kind of digital control method of no electrolytic capacitor LED drive power according to claim 4, which is characterized in that The kdSelection by pfc circuit output voltage and bearing power depending on, when bearing power increase when, duty ratio coefficient kdIt is bigger, Pfc circuit output end storage capacitor voltage reduces;When bearing power reduces, duty ratio coefficient kdIt is smaller, pfc circuit output end Storage capacitor voltage increases.
6. a kind of digital control method of no electrolytic capacitor LED drive power according to claim 4, which is characterized in that The DminSelection by LED load voltage, the peak of the maximum value of pfc circuit output voltage and minimum value and LED load electric current Than determination.
CN201910922367.1A 2019-09-27 2019-09-27 Digital control method of LED driving power supply without electrolytic capacitor Active CN110536516B (en)

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