CN103997827B - A kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit - Google Patents
A kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit Download PDFInfo
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- CN103997827B CN103997827B CN201410196651.2A CN201410196651A CN103997827B CN 103997827 B CN103997827 B CN 103997827B CN 201410196651 A CN201410196651 A CN 201410196651A CN 103997827 B CN103997827 B CN 103997827B
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Abstract
The invention discloses a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit, comprise alternating current input power supplying, bridge rectifier, inductance, auxiliary circuit, main switch, reverse blocking diode pipe, output filter capacitor and LED load.The present invention has following features and advantage: 1) auxiliary circuit can balance input power <i>p
in</i> and power output <i>p
othe low frequency pulsating power of </i>, and constant-current driving LED load; 2) storage capacitor voltage design is the form of direct voltage superposition large pulsation ripple voltage, and the non-electrolytic capacitor (as thin-film capacitor etc.) of low-capacitance thus can be used as storage capacitor; 3) auxiliary circuit and Boost main circuit form three port DC/DC converters, and most of input power only just arrives LED load through primary energy conversion, and thus efficiency is high; 4) inductance needed for auxiliary circuit and Boost main circuit inductance realize sharing, and circuit structure is simple and cost is low.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit, belong to ac/dc (AC/DC), DC-DC (DC/DC) converter field.
Background technology
Along with light-emitting diode (light-emittingdiode, LED) the continuous progress of key technology, the aspects such as its light efficiency, life-span, dimming behavior have more advantage than conventional illumination sources (as incandescent lamp, fluorescent lamp), and LED illumination light source is expected to become high efficiency light source of new generation.Current LED illumination has been applied to the fields such as street lighting, general lighting, LCD screen backlight, landscape light in city, medical treatment and traffic.
But the popularization of LED illumination still has many bottleneck problems to need to solve with development.Wherein the use of electrochemical capacitor in LED drive power limits the life-span of driving power, is the key factor affecting LED illumination System life-span, volume.Therefore, the development that little, that the life-span is long, efficiency is high, cost the is low driving power of volume is conducive to promoting LED illumination is developed.
Be illustrated in figure 1 traditional tandem type LED drive power structured flowchart, be made up of pfc converter cascade DC/DC converter.The pfc converter major function of prime realizes power factor correction (powerfactorcorrection, PFC), and the DC/DC converter of rear class is mainly for LED load provides constant drive current.In Alternating Current Power Supply occasion, in order to reach higher input power factor, meet the harmonic requirement of standard IEC 61000-3-2, AC/DCLED driving power all needs to carry out input power factor correction.But as PF=1, input current and input voltage are the sine wave with frequency homophase, and its input power presents the low frequency power pulses of twice input voltage frequency, and the larger electrochemical capacitor of capacity therefore usually can be selected to balance this low frequency pulsating power.But high-quality electrochemical capacitor is under rated temperature 105oC, and useful life, far below the long-life of LED luminescence chip 80 ~ 100kh, the use of electrochemical capacitor limited LED illumination light source bulk life time generally at about 10kh.Moreover, suppose that the efficiency of pfc converter and DC/DC converter in traditional tandem type LED drive power is respectively
with
, then the overall efficiency of driving power is the product of 2 stage converter efficiency:
(in formula
<1,
<1), so in the two-stage topologies of cascade, input power needs could arrive LED load through twice energy conversion, and overall efficiency is low, and the topology of two-stage type makes, and whole driving power device is many, volume is large, integrated level is low; Although can reduce electrochemical capacitor capacitance to a certain extent by increasing the ripple voltage of dc-link capacitance, DC bus ripple voltage infinitely increases can be affected pfc converter and normally work.
Summary of the invention
The object of the invention is the shortcomings such as the AC/DCLED driving power overall efficiency overcoming Cascade Topology Structure structure is low, device is many, volume is large, integrated level is low, overcome the deficiency reducing LED illumination light source bulk life time because using electrochemical capacitor, a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit is provided.Have the advantages that efficiency is high, volume is little, no electrolytic capacitor, reliability are high, driveability is excellent.
For achieving the above object, the present invention adopts following technical proposals:
Based on a high efficiency no electrolytic capacitor LED drive power for Boost circuit, comprising: bridge rectifier, inductance, auxiliary circuit, main switch, reverse blocking diode pipe, output filter capacitor and LED load.It is characterized in that: described bridge rectifier connects inductance, auxiliary circuit, main switch, reverse blocking diode pipe, output filter capacitor and LED load successively.
Described bridge rectifier is by the first diode D
r1, the second diode D
r2, the 3rd diode D
r3with the 4th diode D
r4composition; Described first diode D
r1anode connect described 3rd diode D
r3negative electrode, described second diode D
r2anode connect described 4th diode D
r4negative electrode, described first diode D
r1with described second diode D
r2negative electrode docking, described 3rd diode D
r3with described 4th diode D
r4anode docking; Described auxiliary circuit is by second switch pipe S
2, the 6th diode D
a2, the 3rd switching tube S
3, storage capacitor C
acomposition; 3rd switching tube S
3source electrode connects inductance L and the second diode D
r2the common node of negative electrode, the 3rd switching tube S
3drain electrode connects storage capacitor C
apositive pole and the 6th diode D
a2the common node of negative electrode, the 6th diode D
a2anode and second switch pipe S
2source electrode be connected, second switch pipe S
2drain electrode connect reverse blocking diode pipe D
a1anode, the first switching tube S
1drain electrode and the common node of inductance L; Described reverse blocking diode pipe 5 i.e. the 5th diode D
a1, the 5th diode D
a1negative electrode and output filter capacitor C
othe positive pole of positive pole, LED load is connected, output filter capacitor C
othe negative pole of negative pole, LED load, storage capacitor C
anegative pole, the first switching tube S
1source electrode all with the 4th diode D
r4anode be connected.
Described by the first diode D
r1, the second diode D
r2, the 3rd diode D
r3with the 4th diode D
r4the bridge rectifier of composition realizes ac/dc conversion.
Described first switching tube S
1realize input power factor correction with inductance L acting in conjunction and regulate storage capacitor C
avoltage.
Described storage capacitor C
avoltage design is the working forms of direct voltage superposition large pulsation ripple voltage, and its capacitance is less.
Described auxiliary circuit can balance the low frequency pulsating power of Instantaneous input power and power output, and input power is less than power output (p
in<p
o) under condition and input power be greater than power output (p
in>p
o) realize constant output under condition and regulate, for LED load provides constant drive current.
Described filter capacitor C
ocan filtering output voltage ripple.
Compared with prior art, technical characteristics of the present invention and advantage are: inductance L is operated in discontinuous conduct mode, realize input power factor correction; Storage capacitor C
avoltage design be the form of direct voltage superposition large pulsation ripple voltage, thus non-electrolytic capacitor can be used to substitute electrochemical capacitor; Auxiliary circuit, under different input power condition, can balance Instantaneous input power p
inwith power output p
oimbalance, and constant-current driving LED load; Inductance required for auxiliary circuit and Boost main circuit inductance realize sharing, and make circuit structure simple and cost is low.
Accompanying drawing explanation
Fig. 1 is traditional tandem type LED drive power structured flowchart.
Fig. 2 is the theory diagram of a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit of the present invention.
Fig. 3 is the main circuit of a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit of the present invention.
Fig. 4 is the key operation waveforms of a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit of the present invention.
Fig. 5 is that a kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit of the present invention is at p
in<p
oswitching tube logic sequence under condition and key operation waveforms.
Fig. 6 is that a kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit of the present invention is at p
in>p
oswitching tube logic sequence under condition and key operation waveforms.
Fig. 7 is that a kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit of the present invention is at p
in<p
othe equivalent circuit diagram of each switch mode under condition.
Fig. 8 is that a kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit of the present invention is at p
in>p
othe equivalent circuit diagram of each switch mode under condition.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further.
Embodiment one: Fig. 2 is a kind of high efficiency no electrolytic capacitor LED drive power theory diagram based on Boost circuit of the present embodiment.Main circuit is three port DC/DC converters, and in main circuit, add storage capacitor, this storage capacitor can balance Instantaneous input power p under different input power condition
inwith power output p
oimbalance, realize constant output regulate, for LED load provides constant drive current.
Embodiment two: a kind of high efficiency no electrolytic capacitor LED drive power main circuit diagram based on Boost circuit being illustrated in figure 3 the present embodiment, the present embodiment is substantially identical with embodiment one, and its special feature is as follows:
A kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit comprises: bridge rectifier (1), inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7).It is characterized in that: described bridge rectifier (1) connects inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7) successively.Described bridge rectifier (1) is by the first diode (D
r1), the second diode (D
r2), the 3rd diode (D
r3) and the 4th diode (D
r4) composition; Described first diode (D
r1) anode connect described 3rd diode (D
r3) negative electrode, described second diode (D
r2) anode connect described 4th diode (D
r4) negative electrode, described first diode (D
r1) and described second diode (D
r2) negative electrode docking, described 3rd diode (D
r3) and described 4th diode (D
r4) anode docking; Described auxiliary circuit (3) is by second switch pipe (S
2), the 6th diode (D
a2), the 3rd switching tube (S
3), storage capacitor (C
a) composition; 3rd switching tube (S
3) source electrode connect inductance (L) with the second diode (D
r2) common node of negative electrode, the 3rd switching tube (S
3) drain electrode connection storage capacitor (C
a) positive pole and the 6th diode (D
a2) common node of negative electrode, the 6th diode (D
a2) anode and second switch pipe (S
2) source electrode be connected, second switch pipe (S
2) drain electrode connect reverse blocking diode pipe (D
a1) anode, main switch i.e. the first switching tube (S
1) drain electrode and the common node of inductance (L); Described reverse blocking diode pipe (5) i.e. the 5th diode (D
a1), the 5th diode (D
a1) negative electrode and output filter capacitor (C
o) positive pole, LED load (7) positive pole be connected, output filter capacitor (C
o) negative pole, the negative pole of LED load (7), storage capacitor (C
a) negative pole, the first switching tube (S
1) source electrode all with the 4th diode (D
r4) anode be connected.
Be a kind of high efficiency no electrolytic capacitor LED drive power main circuit based on Boost circuit of the implementation case below with Fig. 3,4-8 describe specific works principle of the present invention, design principle by reference to the accompanying drawings:
Fig. 4 is the key operation waveforms of a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit proposed by the invention.In order to reach higher input power factor, inductance L is operated in discontinuous current state (discontinuouscurrentmode, DCM), realizes power factor correction.In order to mate the low frequency pulsating power of Instantaneous input power and power output, Boost main circuit adds auxiliary circuit with three-port network form, storage capacitor C in auxiliary circuit
aenergy can realize two-way flow, and the inductance of auxiliary circuit and Boost main circuit inductance share.At a power frequency period, as input power p
inbe less than power output p
otime, S
2turn off, by control S always
1, S
3conducting state can provide constant operation electric current for LED load, now, storage capacitor C
arelease energy to output loading to compensate the energy difference of power output and input power, so the voltage v of storage capacitor
cadecline; As input power p
inbe greater than power output p
otime, S
3turn off, control S always
1, S
2on off state can be implemented as LED load constant operation electric current be provided, now, remaining energy storage is at electric capacity C
aon, so the voltage v of storage capacitor
carise.As can be seen here, this LED drive power is at p
in<p
ooperating state and at p
in>p
ooperating state be distinct.Fig. 5 is that main circuit is at p
in<p
oswitching tube logic sequence under condition and key operation waveforms; Fig. 6 main circuit is at p
in>p
oswitching tube logic sequence under condition and key operation waveforms
1. the principle Analysis under different capacity condition
1.1 work as p
in<p
otime operational modal analysis
Fig. 5 is main circuit p
in<p
oswitching tube logic sequence under condition and key operation waveforms, now have five different operation modes, the equivalent circuit diagram of its switch mode as shown in Figure 7.
1) operation mode 1, [t
o, t
1]: its equivalent operation circuit is as shown in Fig. 7 (a).T
obefore moment, inductive current i
lbe zero, filter capacitor C
opower to LED load.At p
in<p
oswitching tube S under power condition
2turn off, at t always
omoment, switching tube S
1conducting, rectifier diode D
r1and D
r4(or D
r2and D
r3) conducting, input voltage is added in inductance L after rectification, inductive current i
lstart from scratch and linearly rise.Suppose that input voltage remains unchanged in a switch periods, then have:
（1）
2) operation mode 2, [t
1, t
2]: its equivalent operation circuit as shown in Fig. 7 (b), at t
1moment switching tube S
1turn off, inductive current linearly rises to S
1maximum in a switch periods.According to formula (1), t
1the inductive current in moment is:
（2）
D in formula
1and T
sswitching tube S
1duty ratio and switch periods.
At t
1moment switching tube S
1turn off, inductive current i
lby reverse blocking diode pipe D
a1to outlet side flowing, the energy storage of power and inductance L is shifted to LED load and output filter capacitor, now inductive current i
lstart linear decline:
（3）
V in formula
ofor LED load voltage.
At t
2moment inductive current i
ldrop to zero, t
1and t
2the time interval be:
（4）
3) operation mode 3, [t
2, t
3]: its equivalent operation circuit as shown in Fig. 7 (c), switching tube S
1, S
3conducting, due to storage capacitor C
avoltage ratio input supply voltage high, so rectifier diode not conducting; Storage capacitor C
avoltage be added in inductance L, inductive current i
lstart from scratch and linearly rise.Suppose storage capacitor C
avoltage remains unchanged in a switch periods, then have:
（5）
4) operation mode 4, [t
3, t
4]: its equivalent operation circuit as shown in Fig. 7 (d), at t
3moment switching tube S
1, S
3turn off, inductive current linearly rises to S
3maximum in a switch periods.According to formula (6), t
3the inductive current in moment is:
（6）
D in formula
3switching tube S
3duty ratio.
So, at t
3moment switching tube S
1, S
3turn off, inductive current i
lby reverse blocking diode pipe D
a1to outlet side flowing, the energy storage of power and inductance L is shifted to LED load and output filter capacitor, now inductive current i
lstart linear decline:
（7）
At t
4moment, inductance L
acurrent i
ladrop to zero, t
1and t
2the time interval be:
（8）
5) operation mode 5, [t
4, t
5]: its equivalent operation circuit as shown in Fig. 7 (e), in this switch mode, inductive current i
lbe zero, inductance L is operated in discontinuous current state, filter capacitor C
opower to LED load.Because one-period internal inductance discontinuous current, so at p
in<p
ohave under power condition:
（9）
At p
in<p
ounder power condition, in order to ensure that power output is constant, need storage capacitor C
aenergy is provided, so should to release energy the switching tube S of size by regulable control storage capacitor to LED load
3duty ratio, with ensure constant output current and power output constant.
1.2 work as p
in>p
otime operational modal analysis
Fig. 6 is that main circuit is at p
in>p
oswitching tube logic sequence under condition and key operation waveforms, now have four different operation modes, the equivalent electric circuit of its switch mode as shown in Figure 8.
1) operation mode 1, [t
0, t
1]: its equivalent operation circuit is as shown in Fig. 8 (a), similar with Fig. 7 (a), and transient analysis is also similar.T
obefore moment, inductive current i
lbe zero, filter capacitor C
opower to LED load.At p
in<p
oswitching tube S under power condition
2turn off, at t always
omoment, switching tube S
1conducting, rectifier diode D
r1and D
r4(or D
r2and D
r3) conducting, input voltage is added in inductance L after rectification, inductive current i
lstart from scratch and linearly rise.Suppose that input voltage remains unchanged in a switch periods, then have:
（10）
2) operation mode 2, [t
1, t
2]: its equivalent operation circuit as shown in Fig. 8 (b), at t
1moment switching tube S
1turn off, inductive current linearly rises to S
1maximum in a switch periods.According to formula (10), t
1the inductive current in moment is:
（11）
So, at t
1moment switching tube S
1turn off, inductive current i
lby reverse blocking diode pipe D
a1to outlet side flowing, the energy storage of power and inductance L is shifted to LED load and output filter capacitor, now inductive current i
lstart linear decline:
（12）
In order to ensure to provide constant operation electric current to LED load, in each switch periods, the energy of load release must be constant, so at t
2moment switching tube S
2conducting, the energy storage of power and inductance L stops to LED load and output filter capacitor transfer.According to formula (12), at t
2moment inductive current is:
（13）
Δ T in formula
3=t
2-t
1.
3) operation mode 3, [t
2, t
3]: its equivalent operation circuit is as shown in Fig. 8 (c).At t
2moment switching tube S
2conducting, power and inductance L residue energy storage storage capacitor C
atransfer, storage capacitor C
acharged, capacitance voltage rises, and inductive current i
llinear decline.Suppose that input voltage and storage capacitor voltage remain unchanged in a switch periods, then have
（14）
At t
3moment, switching tube S
2turn off, inductive current i
ldrop to zero.
4) operation mode 4, [t
3, t
4]: its equivalent operation circuit is as shown in Fig. 8 (d).At t
3moment, switching tube S
2turn off, inductive current i
ldrop to zero, inductance L is operated in discontinuous current state, filter capacitor C
opower to LED load.Because one-period internal inductance discontinuous current, so at p
in<p
ohave under power condition:
（15）
At p
in<p
ounder power condition, in order to make constant output current thus ensure that power output is constant, need storage capacitor C
aenergy is provided, so should control S to LED load
1, S
2duty ratio, with ensure constant output current and power output constant.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art can carry out numerous embodiments according to content disclosed by the invention.Should understand above-described embodiment to be only not used in for illustration of the present invention and to limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Claims (4)
1. the high efficiency no electrolytic capacitor LED drive power based on Boost circuit, comprise: bridge rectifier (1), inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7), is characterized in that: described bridge rectifier (1) connects inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7) successively; Described bridge rectifier (1) is by the first diode (D
r1), the second diode (D
r2), the 3rd diode (D
r3) and the 4th diode (D
r4) composition; Described first diode (D
r1) anode connect described 3rd diode (D
r3) negative electrode, described second diode (D
r2) anode connect described 4th diode (D
r4) negative electrode, described first diode (D
r1) and described second diode (D
r2) negative electrode docking, described 3rd diode (D
r3) and described 4th diode (D
r4) anode docking; Described auxiliary circuit (3) is by second switch pipe (S
2), the 6th diode (D
a2), the 3rd switching tube (S
3), storage capacitor (C
a) composition; 3rd switching tube (S
3) source electrode connect inductance (L) with the second diode (D
r2) common node of negative electrode, the 3rd switching tube (S
3) drain electrode connection storage capacitor (C
a) positive pole and the 6th diode (D
a2) common node of negative electrode, the 6th diode (D
a2) anode and second switch pipe (S
2) source electrode be connected, second switch pipe (S
2) drain electrode connect reverse blocking diode pipe (D
a1) anode, main switch (4) i.e. the first switching tube (S
1) drain electrode and the common node of inductance (L); Described reverse blocking diode pipe (5) i.e. the 5th diode (D
a1), the 5th diode (D
a1) negative electrode and output filter capacitor (C
o) positive pole, LED load (7) positive pole be connected, output filter capacitor (C
o) negative pole, the negative pole of LED load (7), storage capacitor (C
a) negative pole, the first switching tube (S
1) source electrode all with the 4th diode (D
r4) anode be connected.
2. a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit according to claim 1, is characterized in that: described inductance (L) is operated in discontinuous conduct mode, realizes input power factor correction.
3. a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit according to claim 1, is characterized in that: described storage capacitor (C
a) voltage design be that the working forms of direct voltage superposition large pulsation ripple voltage is to eliminate the dependence of AC/DCLED constant-current driving power supply to electrochemical capacitor.
4. a kind of high efficiency no electrolytic capacitor LED drive power based on Boost circuit according to claim 1, is characterized in that: auxiliary circuit (3) can balance input power p
inwith power output p
olow frequency power pulsation, and constant-current driving LED load (7).
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| CN104218813B (en) * | 2014-09-26 | 2017-08-15 | 浙江大学 | The cascade connection type resonance DC DC translation circuits of inductance capacitance complicated utilization |
| CN104411041A (en) * | 2014-11-19 | 2015-03-11 | 上海大学 | Long-lifetime LED driving power supply of single-inductor three-port converter |
| CN106332355B (en) * | 2016-09-06 | 2018-06-01 | 上海大学 | A kind of non-isolated no electrolytic capacitor LED drive power integrated based on Boost and Flyback circuits |
| CN109005624B (en) * | 2018-08-17 | 2020-08-28 | 江苏大学 | Bridgeless electrolytic capacitor-free LED driving power supply and switching method |
| CN109699106A (en) * | 2019-02-11 | 2019-04-30 | 华南理工大学 | A kind of single-stage no bridge type High Power Factor LED driver without electrolytic capacitors |
| CN110855144B (en) * | 2019-11-19 | 2021-03-23 | 西南交通大学 | Non-isolated three-port direct current converter and control method and circuit thereof |
| TWI717973B (en) | 2020-01-14 | 2021-02-01 | 群光電能科技股份有限公司 | Power conversion system |
| CN113099576B (en) * | 2021-04-21 | 2022-04-08 | 福州大学 | Single-stage two-switch electrolytic-capacitor-free LED driving power supply and control method |
| CN113179008B (en) * | 2021-05-12 | 2024-02-09 | 阳光电源股份有限公司 | Multiphase LLC resonance DC/DC circuit |
| CN114340084B (en) * | 2021-12-31 | 2024-04-19 | 福州大学 | Single-stage low-ripple step-down LED driving circuit without electrolytic capacitor and control method |
| CN117175928B (en) * | 2023-11-02 | 2024-02-02 | 中山市宝利金电子有限公司 | High-performance power factor correction rectification control circuit and switching power supply |
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