CN104619076B - A kind of no electrolytic capacitor crisscross parallel flyback LED drive power - Google Patents
A kind of no electrolytic capacitor crisscross parallel flyback LED drive power Download PDFInfo
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- CN104619076B CN104619076B CN201410768189.9A CN201410768189A CN104619076B CN 104619076 B CN104619076 B CN 104619076B CN 201410768189 A CN201410768189 A CN 201410768189A CN 104619076 B CN104619076 B CN 104619076B
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Abstract
The invention discloses a kind of no electrolytic capacitor crisscross parallel flyback LED drive power, its circuit topology includes exchange input, EMI filtering, electric capacity CIN, in parallel single-stage anti exciting converter, two power decoupling circuits, the commutation diode D5 of two-way, D6, output capacitance C, sampling resistor R and LED load, two power decoupling circuits are added in the input of crisscross parallel anti exciting converter, balance instantaneous input-output power, so that required output filter capacitor capacity is greatly reduced, the electrochemical capacitor in crisscross parallel flyback LED drive power can effectively be removed, so as to reduce the volume of whole driving power supply, extend its service life, improve the stability of system.
Description
Technical field
The invention belongs to applied power electronics technical field, and in particular to a kind of crisscross parallel anti exciting converter and its power
Decoupling circuit, it is adaptable to Switching Power Supply especially LED drive power.
Background technology
With developing rapidly for manufacture material and manufacturing process, LED is in Landscape Lighting, building decoration, electronic product backlight
Extensive use is had been obtained for Deng field.But in the field such as general lighting and street lighting, the application of LED also without arrive
Large-scale to promote, its bottleneck is essentially consisted in：One is big LED caloric values, and temperature rise causes the lost of life；Two is driving power supply
In electrochemical capacitor constrain life-span of driving power supply, cause the life-span of LED illumination System further to shorten.The life-span one of LED
As at 80000-100000 hours, the life-span of electrochemical capacitor is generally 10000 hours, and many LED drive powers are used now
Used as energy-storage travelling wave tube, this will cause the LED drive power lost of life to electrochemical capacitor, while also show removal LED drive power
The necessity of middle electrochemical capacitor.
At present, during the methods of many removal electrochemical capacitors have been applied in LED drive power design.Many research tables
It is bright, it is improved or the new control method of use by circuit topology, it is capable of achieving the no electrolytic capacitor of LED drive power
Change, extend the service life of LED.All it is that existing control method or power circuit are entered although method is many and different
Row is improved, and its thought can substantially be divided to two classes；One is to retain original topology, and control method is improved；Two is new construction
Circuit topology.The new circuit topology of construction has three kinds of methods, respectively replaces electric capacity to carry out energy storage with inductance；In available circuit
Auxiliary circuit is added in topology；Power decoupling circuit.
Crisscross parallel anti exciting converter can effectively reduce the current stress of switching tube, increase power of anti exciting converter etc.
Level, while input, output current ripple are obviously reduced, EMI design is simple, and power density is high.But crisscross parallel inverse-excitation type
LED drive power stills need electrochemical capacitor as energy-storage travelling wave tube, and this will seriously restrict the life-span of LED drive power.
The content of the invention
The present invention be directed to there is electrochemical capacitor in crisscross parallel flyback LED drive power, the influence driving power supply life-span
Problem, proposes a kind of crisscross parallel flyback LED drive power of no electrolytic capacitor.In the input of crisscross parallel anti exciting converter
Plus power decoupling circuit, the purpose of electrochemical capacitor is gone so as to reach, extend the service life of LED drive power.
Present invention employs following technical scheme：Increase in the input of crisscross parallel flyback LED drive power main circuit
Plus two power decoupling circuits, for balancing instantaneous input-output power and reducing the capacity of output filter capacitor.
Further, described no electrolytic capacitor crisscross parallel flyback LED drive power, its main circuit structure includes that exchange is defeated
Enter, EMI is filtered, electric capacity CIN, two power decoupling circuit, commutation diode D5, D6, output capacitance C, sampling resistor R and LED bear
Carry.
Further, two-way single-stage anti exciting converter in parallel, first via single-stage anti exciting converter includes transformer T1
Armature winding Np1, secondary windings Ns, switching tube Q1；Armature winding Np1 ' of the second road anti exciting converter including transformer T2,
Secondary windings Ns ', switching tube Q2.The rectification that electric main input is made up of by EMI filtering connections diode D1, D2, D3, D4
Output cathode connects armature winding Np1 one end of one end of electric capacity, transformer T1, T2, transformer T1 armature windings respectively after bridge
The drain electrode of the other end connecting valve pipe Q1 of Np1, the other end of the source class connection electric capacity of switching tube Q1 simultaneously connects the defeated of rectifier bridge
Go out negative pole；The positive level of one end connection output commutation diode D5 of transformer T1 secondary windings Ns, the negative pole of output diode D5
One section with negative pole, one end of output capacitance and the LED load for exporting commutation diode D6 is connected, transformer T1 secondary windings
The other end of Np1 ' is connected with the other end of output capacitance, one end of sampling resistor R and output ground terminal, and sampling resistor R's is another
One end is connected with the other end of LED load；The drain electrode of the other end connecting valve pipe Q2 of transformer T2 armature windings Np1 ', switch
The source class connection rectifier bridge output negative pole of pipe Q2；One end connection output commutation diode D6's of transformer T2 secondary windings Ns '
Positive level, the other end connection output ground terminal of transformer T2 secondary windings Ns '.
Further, described two power decoupling circuits, Np2 is the additional winding of transformer T1 primary sides, CaIt is have big electricity
The storage capacitor of fluctuation is pressed, Q3 is the switch of decoupling circuit, and D7 is commutation diode, and D9 is the resistance for preventing reverse current from flowing to Q3
Disconnected diode, Q5 is the switch of transformer T1 primary sides.Np2 ' is the additional winding of the primary side of transformer T2, CbIt is have big electricity
The storage capacitor of fluctuation is pressed, Q4 is the switch of decoupling circuit, and D8 is commutation diode, and D10 prevents reverse current from flowing to Q4
Blocking diode, Q6 is the switch of transformer T2 primary sides.One end of the additional winding Np2 of transformer T1 primary sides is connected to two
The negative pole of pole pipe D9, the positive pole of diode D9 is connected to one end of switch Q3, switchs the other end of Q3 respectively with diode D7's
Negative pole, one end of storage capacitor Ca are connected, storage capacitor CaThe other end and rectifier bridge VinEnd is connected, the positive pole of diode D7
One end of transformer T1 armature windings Np1 is then connected to, switch Q5 is then connected to transformer T1 primary sides；Transformer T2 primary sides
One end of additional winding Np2 ' be connected to the negative pole of diode D10, the positive pole of diode D10 is connected to one end of switch Q4,
The other end of switch Q4 negative pole, storage capacitor C respectively with diode D8bOne end be connected, storage capacitor CbThe other end and whole
Flow the V of bridgeinEnd is connected, and the positive pole of diode D8 is then connected to one end of transformer T2 armature windings Np1 ', and switch Q6 is then connected
In transformer T2 primary sides.
Compared with prior art, the invention has the advantages that：
The present invention can balance instantaneous input-output power so that required capacitance is greatly reduced, it is possible to use small
Capacity, long-life thin-film capacitor replace electrochemical capacitor, so as to remove the electrolysis electricity in crisscross parallel flyback LED drive power
Hold, reduce the volume of whole driving power supply, extend its service life, improve the stability of system.
Brief description of the drawings
Fig. 1 is no electrolytic capacitor crisscross parallel flyback converter topology structure chart of the present invention；
Fig. 2 is no electrolytic capacitor crisscross parallel anti exciting converter of the present invention in Pin<PoWhen switching tube drive signal；
Fig. 3 is no electrolytic capacitor crisscross parallel anti exciting converter of the present invention in Pin>PoWhen switching tube drive signal；
Fig. 4 is no electrolytic capacitor crisscross parallel anti exciting converter of the present invention in Pin>PoWhen equivalent circuit, wherein：
(a)t0~t1Stage equivalent circuit diagram；
(b)t1~t2Stage equivalent circuit diagram；
(c)t2~t3Stage equivalent circuit diagram；
(d)t3~t4Stage equivalent circuit diagram；
Fig. 5 is no electrolytic capacitor crisscross parallel anti exciting converter of the present invention in Pin>PoWhen equivalent circuit, wherein：
(a)t0~t1Stage equivalent circuit diagram；
(b)t1~t2Stage equivalent circuit diagram；
(c)t2~t3Stage equivalent circuit diagram；
(d)t3~t4Stage equivalent circuit diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is no electrolytic capacitor crisscross parallel anti exciting converter structure principle chart of the present invention.
A kind of no electrolytic capacitor crisscross parallel flyback LED drive power, its main circuit structure are as shown in figure 1, including exchange
Input, EMI filtering, electric capacity CIN, in parallel single-stage anti exciting converter, two power decoupling circuits, the commutation diode D5 of two-way,
D6, output capacitance C, sampling resistor R and LED load.
Wherein, first via single-stage anti exciting converter includes armature winding Np1, the secondary windings Ns, switching tube of transformer T1
Q1；Second road anti exciting converter includes armature winding Np1 ', the secondary windings Ns ' of transformer T2, switching tube Q2.Electric main is defeated
Enter by output cathode after the EMI filtering rectifier bridges that are made up of diode D1, D2, D3, D4 of connection connect respectively one end of electric capacity,
Armature winding Np1 one end of transformer T1, T2, the drain electrode of the other end connecting valve pipe Q1 of transformer T1 armature windings Np1, open
Close the other end of the source class connection electric capacity of pipe Q1 and connect the output negative pole of rectifier bridge；One end of transformer T1 secondary windings Ns connects
Connect the positive level of output commutation diode D5, the negative pole of output diode D5 and negative pole, the output capacitance of output commutation diode D6
One end and one section of LED load be connected, the other end of transformer T1 secondary windings Np1 ' and the other end of output capacitance, adopt
One end of sample resistance R and output ground terminal are connected, and the other end of sampling resistor R is connected with the other end of LED load；Transformer T2
The drain electrode of the other end connecting valve pipe Q2 of armature winding Np1 ', the source class connection rectifier bridge output negative pole of switching tube Q2；Transformation
The positive level of one end connection output commutation diode D6 of device T2 secondary windings Ns ', the other end of transformer T2 secondary windings Ns ' connects
Connect output ground terminal.
Two power decoupling circuits, Np2 is the additional winding of transformer T1 primary sides, CaIt is the energy storage for having big voltage pulsation
Electric capacity, Q3 is the switch of decoupling circuit, and D7 is commutation diode, and D9 is the blocking diode for preventing reverse current from flowing to Q3, Q5
It is the switch of transformer T1 primary sides.Np2 ' is the additional winding of the primary side of transformer T2, CbIt is the storage for having big voltage pulsation
Energy electric capacity, Q4 is the switch of decoupling circuit, and D8 is commutation diode, and D10 is the blocking diode for preventing reverse current from flowing to Q4,
Q6 is the switch of transformer T2 primary sides.
Because the present invention is for balancing input-output power, so its prevailing operating state is divided into two parts：One is
Input power is less than power output, i.e. Pin<Po；Two is that input power is more than power output, i.e. Pin>Po；Each part respectively has four
Individual operation mode, first introduces Pin<PoWhen four courses of work.
1.Pin<Po：Drive signal is referring to Fig. 2；
[t0~t1] referring to Fig. 4 (a), in t0~t1In time period, the conducting of Q1, Q4 switching tube, the Np1 of flyback transformer T1
Winding energy storage energy.It could here be noted that although Q5, Q6 are constantly in conducting state, but electric current does not flow through, because this
When Pin<Po, secondary windings is passive.Now electric capacity CbStart to release energy by Q4, D10, to transformer T2 it is additional around
Group Np2 ' storage energy, CbThe effect of supplement energy is served herein, and now LED load is by COUTEnergy supply.
[t1~t2] referring to Fig. 4 (b), in t1Moment, Q4 switching tubes shut-off, now flyback transformer T2 energy storage is finished；In t1
~t2Time period, primary side energy transfer starts to give LED load energy supply to secondary；The primary side of flyback transformer T1 continues energy storage.
[t2~t3] referring to Fig. 4 (c), in t2Moment, switching tube Q1 shut-offs, now due to Pin<Po, although Q5 is constantly in
Conducting state, but no electric current flows through Q5.In t2~t3In time period, the conducting of Q3 switching tubes, storage capacitor CaStart to discharge energy
Amount, additional winding Np2 energy storage energy is given by Q3, D9.Q2 conductings simultaneously, the Np1 ' windings of flyback transformer T2 start to store energy
Amount, LED load is by COUTEnergy supply.
[t3~t4] referring to Fig. 4 (d), in t3Moment, switching tube Q3 shut-offs, flyback transformer T1 energy storage is finished；In t3~t4
In time period, primary side energy transmission starts to give LED load energy supply to secondary；Flyback transformer T2 continues energy storage simultaneously.
2.Pin>Po：Drive signal is referring to Fig. 3；
[t0~t1] referring to Fig. 5 (a), in t0Moment, switching tube Q1, Q6 conducting, the primary side Np1 windings of flyback transformer T1
Start to store energy；In t0~t1In time period, due to Pin>Po, the energy being stored in flyback transformer T2 is transferred to from primary side
Secondary, gives LED load energy supply.
[t1~t2] referring to Fig. 5 (b), in t1Moment switching tube Q6 is turned off, and after Q6 shut-offs, is stored in many in transformer
Remaining energy is stored into C by armature winding Np1 ' and D8bIn, CbNow serve the effect of storage excess energy.While flyback
The primary side of transformer T1 continues energy storage energy, and LED load is by COUTEnergy supply.
[t2~t3] referring to Fig. 5 (c), in t2Moment switching tube Q1 is turned off, Q2 conductings, now the original of this flyback transformer T2
Side Np2 ' windings start to store energy.Due to switching tube Q5 conductings, the energy being stored in flyback transformer T1 is transmitted from primary side
To secondary, energy is provided to LED load.
[t3~t4] referring to Fig. 5 (d), in t3Moment switching tube Q5 is turned off, and now flyback transformer T1 energy transmissions are finished,
The unnecessary energy being stored in T1 is stored into C by armature winding Np1 and D7aIn, now CaServe storage excess energy
Effect.The primary side of flyback transformer T2 continues to store energy simultaneously, and LED load is by COUTEnergy supply.
The present invention adds two power decoupling circuits on the basis of crisscross parallel flyback LED drive power, and balance is instantaneous
Input-output power so that required capacitance is greatly reduced, can effectively remove crisscross parallel flyback LED drive power
In electrochemical capacitor, so as to reduce the volume of whole driving power supply, extend its service life, improve the stability of system.
Claims (2)
1. a kind of no electrolytic capacitor crisscross parallel flyback LED drive power, it is characterised in that driven in crisscross parallel flyback LED
The input of electric power main circuit increases by two power decoupling circuits, for balancing instantaneous input-output power and reducing output filtering
The capacity of electric capacity；
The crisscross parallel flyback LED drive power main circuit includes exchange input, EMI filtering, electric capacity CIN, the in parallel list of two-way
Level anti exciting converter, commutation diode D5 and D6, output capacitance C, sampling resistor R and LED load；
Two-way single-stage anti exciting converter in parallel, first via single-stage anti exciting converter includes the armature winding of transformer T1
Np1, secondary windings Ns, switching tube Q1；Second road anti exciting converter includes armature winding Np1 ', the secondary windings of transformer T2
Ns ', switching tube Q2；Electric main input is exported by after the rectifier bridge that EMI filtering connections are made up of diode D1, D2, D3, D4
Positive pole connects armature winding Np1 ' one end of one end of electric capacity, the armature winding Np1 of transformer T1 and transformer T2, transformation respectively
The drain electrode of the other end connecting valve pipe Q1 of device T1 armature windings Np1, the other end of the source electrode connection electric capacity of switching tube Q1 simultaneously connects
Connect the output negative pole of rectifier bridge；The positive pole of one end connection output commutation diode D5 of transformer T1 secondary windings Ns, output two
The negative pole of pole pipe D5 is connected with one section of negative pole, one end of output capacitance and the LED load for exporting commutation diode D6, transformation
The other end of device T1 secondary windings Ns is connected with the other end of output capacitance, one end of sampling resistor R and output ground terminal, samples
The other end of resistance R is connected with the other end of LED load；The other end connecting valve pipe Q2's of transformer T2 armature windings Np1 '
Drain electrode, the source electrode connection rectifier bridge output negative pole of switching tube Q2；One end connection output rectification two of transformer T2 secondary windings Ns '
The positive pole of pole pipe D6, the other end connection output ground terminal of transformer T2 secondary windings Ns '.
2. no electrolytic capacitor crisscross parallel flyback LED drive power according to claim 1, it is characterised in that described two
Np2 in individual power decoupling circuit is the additional winding of transformer T1 primary sides, CaIt is the storage capacitor for having big voltage pulsation, Q3
It is the switch of decoupling circuit, D7 is commutation diode, and D9 is the blocking diode for preventing reverse current from flowing to Q3, and Q5 is transformer
The switch of T1 primary sides；Np2 ' is the additional winding of the primary side of transformer T2, CbIt is the storage capacitor for having big voltage pulsation, Q4
It is the switch of decoupling circuit, D8 is commutation diode, and D10 is the blocking diode for preventing reverse current from flowing to Q4, and Q6 is transformation
The switch of device T2 primary sides；
One end of the additional winding Np2 of transformer T1 primary sides is connected to the negative pole of diode D9, the positive pole connection of diode D9
To the one end for switching Q3, other end negative pole, the storage capacitor C respectively with diode D7 of Q3 is switchedaOne end be connected, energy storage electricity
Hold CaThe other end and rectifier bridge VinEnd is connected, and the positive pole of diode D7 is then connected to the one of transformer T1 armature windings Np1
End, switch Q5 is then connected to transformer T1 primary sides；
One end of the additional winding Np2 ' of transformer T2 primary sides is connected to the negative pole of diode D10, the positive pole of diode D10
One end of switch Q4 is connected to, other end negative pole, the storage capacitor C respectively with diode D8 of Q4 is switchedbOne end be connected, storage
Can electric capacity CbThe other end and rectifier bridge VinEnd is connected, and the positive pole of diode D8 is then connected to transformer T2 armature windings Np1 '
One end, switch Q6 be then connected to transformer T2 primary sides.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410768189.9A CN104619076B (en) | 2014-12-11 | 2014-12-11 | A kind of no electrolytic capacitor crisscross parallel flyback LED drive power |
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| CN201410768189.9A CN104619076B (en) | 2014-12-11 | 2014-12-11 | A kind of no electrolytic capacitor crisscross parallel flyback LED drive power |
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| CN104619076B true CN104619076B (en) | 2017-06-27 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655740B (en) * | 2015-11-02 | 2019-04-16 | 陈仲 | A kind of isolated form inverter inhibiting power ripple |
| CN109842311A (en) * | 2019-01-21 | 2019-06-04 | 江苏大学 | A kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit |
| CN109688669B (en) * | 2019-03-11 | 2021-01-29 | 福州大学 | High-power-factor electrolytic-capacitor-free LED driving power supply and control method thereof |
| CN114499182A (en) * | 2020-10-23 | 2022-05-13 | 华为数字能源技术有限公司 | Power supply and current sampling method |
| CN113966032B (en) * | 2021-10-18 | 2023-11-21 | 河北科技大学 | Single-stage multipath LED driver based on flyback circuit |
| CN115995986B (en) * | 2023-03-24 | 2023-06-09 | 安徽微伏特电源科技有限公司 | Series-parallel flyback boost circuit topology with triangular structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103606956A (en) * | 2013-11-29 | 2014-02-26 | 河北工业大学 | Power decoupling circuit for photovoltaic grid-connected inverter |
| CN203675000U (en) * | 2013-12-03 | 2014-06-25 | 东南大学 | Photovoltaic grid-connection micro inverter |
| CN104124885A (en) * | 2014-07-31 | 2014-10-29 | 安徽明赫新能源有限公司 | H6 photovoltaic grid-connected inverter of interleaved parallelly-connected BOOST structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104104221B (en) * | 2013-04-11 | 2017-05-17 | 通用电气公司 | Energy conversion system having active and reactive power decoupling compensation mechanism and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103606956A (en) * | 2013-11-29 | 2014-02-26 | 河北工业大学 | Power decoupling circuit for photovoltaic grid-connected inverter |
| CN203675000U (en) * | 2013-12-03 | 2014-06-25 | 东南大学 | Photovoltaic grid-connection micro inverter |
| CN104124885A (en) * | 2014-07-31 | 2014-10-29 | 安徽明赫新能源有限公司 | H6 photovoltaic grid-connected inverter of interleaved parallelly-connected BOOST structure |
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