CN105898946A - Method for realizing LED lighting driving power supply without electrolytic capacitor - Google Patents
Method for realizing LED lighting driving power supply without electrolytic capacitor Download PDFInfo
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Abstract
The invention discloses a method for realizing an LED lighting driving power supply without an electrolytic capacitor. The invention has the main technical characteristics that the primary side controller realizes high power factor; after the energy storage capacitor is output, an RC filter circuit is added to obtain the average voltage of the power supply, and an error amplification signal of the average voltage and the instantaneous output voltage is transmitted to a DC/DC controller; an auxiliary winding is added to store and release energy, and low output voltage ripple can be realized by controlling a Buck topological structure, so that the capacitance value of the storage capacitor is reduced, and no electrolytic capacitor is really realized. The driving power supply does not need a Boost topological circuit which is difficult to control, can realize no electrolytic capacitor only by an easily-controlled Buck circuit, has the characteristics of high power factor, long service life, easy control and the like, and is suitable for application occasions of medium-power and low-power LED driving power supplies.
Description
Technical field
The present invention relates to LED drive power design and DC/DC control technology, the LED illumination particularly relating to a kind of no electrolytic capacitor drives power supply implementation method.
Background technology
In recent years, global problem of environmental pollution is more and more prominent, various countries' energy critical shortage, and the mankind are for environmental protection and how to make full use of the consciousness of the energy more and more higher.The advantages such as LED is energy-efficient with it, environmental protection, long-life, small size make lighting field enter a new era, and LED also becomes the forth generation light source of the electric filament lamp that continues, fluorescent lamp and high-voltage gas discharging light.For improving power factor and power supply reliability, the capacitance of input capacitance Cin after rectifier bridge is reduced to microfarad or sub-microfarad range, can realize without electrochemical capacitor.But no matter LED drive power design uses single stage type structure or tandem type structure, for reducing the fluctuation of output electric current, power output end also needs to apply the electric capacity of bigger capacitance, generally realizes with electrochemical capacitor.The particularly power supply of single stage topology, output contains the flutter component of bigger twice incoming frequency, even if use the output capacitance of millifarad level at outfan, however it remains stroboscopic phenomenon, causes part population untoward reaction occur.Additionally, the average life of LED has 100, within 000 hour, driving the energy storage electrochemical capacitor in power supply typically to only have the life-span of 5,000 hour far above it, therefore electrochemical capacitor is the key factor limiting the LED drive power life-span.
Research about no electrolytic capacitor LED illumination power supply, list of references [1] is given and replaces electrochemical capacitor as the method for energy-storage travelling wave tube with inductance, list of references [2] is given and injects three times in input current and the method for quintuple harmonics, also has other new circuit topology [3].These methods, while different, but be all that existing control method or power circuit are improved, its thought substantially can divide two classes: one is to retain original topology, improves control method；Two is the circuit topology that structure is new.Improve control method and have two kinds of methods, i.e. allow the difference that there is bigger voltage ripple and reduce between input power and output.Structure novel circuit topology has three kinds of methods, is respectively and replaces electric capacity to carry out energy storage with inductance；Auxiliary circuit is added in available circuit topology；Add power decoupling circuit.
Relatively can be shown that by actual experiment there is presently no a kind of perfect technology really realizes LED drive power no electrolytic capacitor.Although the method to input current harmonic achieves no electrolytic capacitor, but is reduction of the power factor of circuit.Although the method to output electric current harmonic improves the power factor of circuit, but its output electric current is PWM waveform, and drives LED can reduce the luminous efficiency of LED with PWM waveform electric current.In different new topologys, although some circuit reliabilities are high, but volume increases；Although some circuit stable performances, but it is only applicable to small-power grade；Some circuit efficiencies are high, but circuit structure is complicated.In applying future, it is contemplated that from control circuit angle, to circuit injection current harmonic wave electrical network may be caused can not interference therewith, therefore should seek to use the no electrolytic capacitor of novel circuit topological realization LED drive power as far as possible.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of no electrolytic capacitor LED drive power implementation method with high reliability, stable performance and simple in construction, compare existing improvement control method and novel circuit topology, it can make LED drive power really realize no electrolytic capacitor, add the LED drive power life-span, while obtaining High Power Factor, not only remove big electrochemical capacitor the most effectively reduce output voltage pulsation.
Technical scheme: for solving above-mentioned technical problem, the technical solution used in the present invention is:
The LED illumination of no electrolytic capacitor drives power supply implementation method, described no electrolytic capacitor LED illumination to drive power supply to include alternating current input power supplying, EMI filter circuit, rectifier bridge, primary controller, RCD clamp circuit, transformator, storage capacitor, RC filter circuit, DC/DC controller, transformator auxiliary winding and Buck circuit.EMI filter circuit effectively suppresses electric network noise；Rectifier circuit by input ac voltage rectification be half-sinusoid fluctuation DC voltage；Primary controller controls the dutycycle of MOSFET and obtains High Power Factor；RCD clamp circuit is used for absorbing leakage inductance energy and drain voltage；Transformer pressure-reducing also realizes input and output electrical isolation；RC filter circuit obtains output voltage average value；DC/DC controller controls the dutycycle of Buck circuit breaker in middle pipe and reduces output voltage pulsation.This implementation method comprises the steps:
Step one: input ac power filters the interference to power supply of the high-frequency impulse of extraneous electrical network through EMI filter circuit, reduces power supply electromagnetic interference to external world itself simultaneously.
Step 2: by rectifier bridge by input sine wave ac voltage rectifier be half-sinusoid fluctuation DC voltage；
Step 3: primary controller is operated in critical conduction mode, the dutycycle controlling former limit MOSFET follows input voltage half-sinusoid waveform well to realize input current waveform, it is achieved PFC, it is thus achieved that High Power Factor；
Step 4: transformator realizes blood pressure lowering and input and output electrical isolation, the voltage ratio of primary and secondary side is equal to its turn ratio, and owing to the capacitance of Cout is little, secondary exports significantly pulsating volage；
Step 5: output ripple voltage obtains output voltage average value through RC filter circuit, instantaneous value and meansigma methods to electric power output voltage monitor in real time and the error signal of the two are amplified；
Step 6: the error signal of amplification is sent to DC/DC controller, its output control signal controls switching tube M1, M2, M3 switch；
Step 7: increase turn ratio be the auxiliary winding of secondary turn ratio 2 times (Na=2Ns) as extra energy-storage travelling wave tube, in conjunction with Buck topological structure, electric power output voltage is adjusted, obtains stable output voltage.
In general, LED illumination drives the input of power supply to be Width funtion input, and input ac voltage scope is 85V～265V.
In general, described EMI filter circuit uses the filtering of two-stage EMI, twice EMI filter circuit, the high frequency spurs in electrical network and homophase interference electric current can be filtered well, the electromagnetic radiation produced in power supply is cut to bottom line simultaneously, makes the amount of electromagnetic radiation leaking into outside power supply be unlikely to human body or miscellaneous equipment and have undesirable effect.
Preferably, described primary controller uses single-stage flyback topologies structure, is operated in critical conduction mode, and the dutycycle controlling switching tube realizes PFC, it is thus achieved that High Power Factor.Single-stage flyback topologies structure can reduce cost, it is easy to control realization, can improve efficiency.
Preferably, the built-in multiplier of described primary controller, there is superior performance, wherein comprise reduction AC input current distortion circuit, there is relatively low total harmonic distortion (THD)；There is the starting current of as little as tens microamperes, simple start-up circuit, low-power consumption；There is overvoltage protective module；When the situation of generation overvoltage, an internal comparator ensures that external power switch remains turned-off.
Preferably; in described step 3; RCD clamp circuit need to be added for absorbing leakage inductance energy and drain voltage in the former limit of transformator, due to the crest voltage at its two ends, protection MOSFET will not include that due to voltage spikes that instantaneous input line voltage, reflected voltage from primary side and leakage inductance produce damages when off.
Preferably, in described step 6, increasing transformator and assist winding as extra energy-storage travelling wave tube, DC/DC controller only need to control Buck circuit, makes output DC/DC changer be more easily controlled.
Beneficial effect: the problems such as a kind of no electrolytic capacitor LED illumination that the present invention provides drives power supply implementation method, and the life-span solving LED drive power is short, low power factor, luminous efficiency are low；Make full use of the advantages such as LED is energy-efficient, environmental protection, long-life, small size, and avoid short bulky electrochemical capacitor in service life；While having ensured LED luminous efficiency, decrease the loss driving power supply its shelf-life, add service life and the reliability of power supply.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the present invention.
Fig. 2 is the experiment effect comparison diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
It is illustrated in figure 1 the LED drive power of a kind of no electrolytic capacitor, including electromagnetic interface filter, full bridge rectifier, primary controller, RCD clamp circuit, transformator, output storage capacitor, LED, RC filter circuit, DC/DC controller, Buck topological circuit and auxiliary winding.RC wave filter produces the meansigma methods of electric power output voltage, instantaneous value and meansigma methods to electric power output voltage monitor in real time, and the error signal of the two is sent to DC/DC controller by amplifier amplification, use Buck topological structure and transformator auxiliary winding that output voltage is adjusted, reduce output voltage pulsation, reach the purpose of regulated output voltage.
Specific works principle is:
1) when exporting instantaneous voltage Vout more than output average voltage Vaverage, operational amplifier (AMP) amplifies the difference between Vout and Vaverage and is transported to DC/DC controller.Now M1 and M2 is in the duty of continuous on an off, M3 is then constantly in off state, originally only through Ns winding export the portion of energy of Cout through Na winding by specific store on electric capacity Cstorage, voltage Vc on Cstorage is raised, reaches to reduce the purpose of the difference between Vout and Vaverage.M1 and M2 is connected in series, and its source electrode links together, it is therefore an objective to the body diode of the two MOSFET forms back-to-back structure, it is ensured that does not have electric current when M1 and M2 is off state in its body diode and passes through.M1 with M2 with switching frequency identical with the switching frequency of primary side switch device M0, but the most anti-phase.When the anode voltage of D3 is higher than Vout, M1 and M2 turns on, and the amplification signal that its ON time is produced through amplifier by the difference between Vout and Vaverage determines.Difference is the biggest, and ON time is the longest, and when Vout is in Vpk position, ON time is the longest.Meanwhile, M1 and M2 must turn off when the anode voltage of D3 drops to close in Vout.
2) when exporting instantaneous voltage Vout less than output average voltage Vaverage, operational amplifier (AMP) amplifies the difference between Vout and Vaverage and is transported to DC/DC controller.Now M3 is in the duty of continuous on an off, M1 and M2 is then constantly in off state, the Buck structure that the energy of the upper storage of Cstorage forms through M3, D2 and inductance L is then transferred on Cout, reaching to reduce the purpose of the difference between Vout and Vaverage, the voltage Vc on Cstorage declines simultaneously.Now, the switching frequency of M3 is identical with the switching frequency of primary side switch device M0, and homophase.When the anode voltage of D3 is less than Vout, M3 turns on, and the amplification signal that its ON time is produced through amplifier by the difference between Vout and Vaverage determines.Difference is the biggest, and ON time is the longest, and when Vout is in Vbottom position, ON time is the longest.Meanwhile, M3 must turn off when the anode voltage of D3 is higher than Vout.
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
List of references:
[1] Qin Y X, Chung H S H, Lin D Y, etal.Current source ballast for high power lighting emitting diods without electronic capacitor [A] .IECON 2008 [C] .2008.1968-1973
[2] Gu Linlin, Ruan Xinbo, Xu Ming, etal.Means of eliminating electrolytic capacitor in AC/DC power supplies for LED lighting [J] .IEEE Transactions on Power Electronics, 2009,24 (5): 1399-1408.
[3] Arias M, Fernandez Diaz M, Lamar D G, etal.High efficiency asymmetrical half-bridge converter without electronic capacitor for low-output-voltage ac-dc LED drivers [J] .IEEE Transactions on Power Electronics, 2013,28 (5): 2539-2550.
[4] energy, ripple, Qiu Dongyuan are opened. no electrolytic capacitor LED drive circuit prior art dissects [J]. electrician's electric energy new technique .2014 (02), 44-51.
Claims (5)
1. the LED illumination of no electrolytic capacitor drives power supply implementation method, it is characterised in that this LED drive power mainly includes alternating current input power supplying, EMI filter circuit, rectifier bridge, primary controller, RCD clamp circuit, transformator, storage capacitor, RC filter circuit, DC/DC controller, transformator auxiliary winding and Buck circuit.This implementation method comprises the steps:
Step one: input ac power filters the interference to power supply of the high-frequency impulse of extraneous electrical network through EMI filter circuit, reduces power supply electromagnetic interference to external world itself simultaneously.
Step 2: by rectifier bridge by input sine wave ac voltage rectifier be half-sinusoid fluctuation DC voltage；
Step 3: primary controller is operated in critical conduction mode, the dutycycle controlling former limit MOSFET follows input voltage half-sinusoid waveform well to realize input current waveform, it is achieved PFC, it is thus achieved that High Power Factor；
Step 4: transformator realizes blood pressure lowering and input and output electrical isolation, the voltage ratio of primary and secondary side is equal to its turn ratio, and secondary exports significantly pulsating volage；
Step 5: output ripple voltage obtains output voltage average value through RC filter circuit, instantaneous value and meansigma methods to electric power output voltage monitor in real time and the error signal of the two are amplified；
Step 6: the error signal of amplification is sent to DC/DC controller, output control signal controls switching tube M1, M2, M3 switch；
Step 7: increase turn ratio be the auxiliary winding of secondary turn ratio 2 times as extra energy-storage travelling wave tube, in conjunction with Buck topological structure, electric power output voltage is adjusted, obtains stable output voltage.
The LED illumination of no electrolytic capacitor the most according to claim 1 drives power supply implementation method, it is characterised in that: the meansigma methods of electric power output voltage is produced with RC wave filter.
The LED illumination of no electrolytic capacitor the most according to claim 1 drives power supply implementation method, it is characterised in that: instantaneous value and meansigma methods to electric power output voltage monitor in real time and the error signal of the two are amplified, and are sent to DC/DC switching controller.
The LED illumination of no electrolytic capacitor the most according to claim 1 drives power supply implementation method, it is characterised in that: utilize transformator auxiliary winding as extra energy-storage travelling wave tube, energy is stored and discharges.
The LED illumination of no electrolytic capacitor the most according to claim 1 drives power supply implementation method, it is characterised in that: use Buck topological structure that electric power output voltage is adjusted, reach the purpose of regulated output voltage.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108207053A (en) * | 2016-12-16 | 2018-06-26 | 施耐德电气工业公司 | driving circuit |
| CN108377097A (en) * | 2018-02-14 | 2018-08-07 | 南京舒尔斯科技有限公司 | A kind of auxiliary power supply circuit of power amplifier |
| CN109309995A (en) * | 2018-12-04 | 2019-02-05 | 刘少京 | A kind of high-power no electrolytic capacitor low ripple LED power |
| CN112087842A (en) * | 2019-05-27 | 2020-12-15 | 李宗凤 | Practical LED driver |
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
| US11864292B2 (en) * | 2020-04-23 | 2024-01-02 | Tridonic Gmbh & Co Kg | Isolated converter with improved current sensing |
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Patent Citations (3)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108207053A (en) * | 2016-12-16 | 2018-06-26 | 施耐德电气工业公司 | driving circuit |
| CN108207053B (en) * | 2016-12-16 | 2019-11-26 | 施耐德电气工业公司 | Driving circuit |
| CN108377097A (en) * | 2018-02-14 | 2018-08-07 | 南京舒尔斯科技有限公司 | A kind of auxiliary power supply circuit of power amplifier |
| CN109309995A (en) * | 2018-12-04 | 2019-02-05 | 刘少京 | A kind of high-power no electrolytic capacitor low ripple LED power |
| CN112087842A (en) * | 2019-05-27 | 2020-12-15 | 李宗凤 | Practical LED driver |
| CN112087842B (en) * | 2019-05-27 | 2024-04-26 | 李宗凤 | Practical LED driver |
| US11864292B2 (en) * | 2020-04-23 | 2024-01-02 | Tridonic Gmbh & Co Kg | Isolated converter with improved current sensing |
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
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