CN108235516A - A kind of LED drive circuit with constant current and equal properties of flow - Google Patents
A kind of LED drive circuit with constant current and equal properties of flow Download PDFInfo
- Publication number
- CN108235516A CN108235516A CN201810046923.9A CN201810046923A CN108235516A CN 108235516 A CN108235516 A CN 108235516A CN 201810046923 A CN201810046923 A CN 201810046923A CN 108235516 A CN108235516 A CN 108235516A
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- led light
- light string
- capacitance
- rectifier diode
- switching tube
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED drive circuits with constant current and equal properties of flow, including constant-current network, equalizing-current network and LED light load circuit, constant-current network is made of the full-bridge resonant network with constant-current characteristics, equalizing-current network is flowed by capacitance realizes that four paths of LEDs lamps flow work, LED drive circuit proposed by the invention, the LED light load of the identical or different number in tetra- tunnels of Ke Wei provides constant current and stream output, the circuit not only has inherent automatic constant current and equal properties of flow, also has the characteristics that topological structure is simple, component number is few and is easily achieved.
Description
Technical field
The present invention relates to field of LED drive technologies, and in particular to a kind of LED driving electricity with constant current and equal properties of flow
Road.
Background technology
LED has the characteristics that light efficiency height, long lifespan, response is fast and the feature of environmental protection is good, has started multiple as lighting source
Lighting area replaces conventional light source.Since the power of single LED lamp bead is small, brightness is low, in the photograph for needing large area and high illumination
Light field closes, and can not be met the requirements using illumination scheme of single LED as lighting source.To solve this problem, often LED is adopted
It is attached with the mode of in parallel, series connection and series-parallel connection.Otherness, LED driving voltages in view of LED light characterisitic parameter is to safety
Requirement and work reliability requirements, although being connected in series with using independent LED can ensure that its forward current is equal,
Excessive LED series connection can make that driving voltage is excessively high, reliability reduces.At present in the larger application scenario of power, mostly using LED
String and the structure of series-parallel connection, since each LED light has different characteristic curves, even if the voltage being applied on LED strings is consistent,
Electric current in each LED strings is also resulted in have differences.This will make each LED strings gently then reduce heavy duty under different working conditions
It is the service life of branch, heavy then damage heavily loaded branch.Therefore each LED must be gone here and there to use and flows measure.
Invention content
In view of the deficiencies of the prior art, the present invention proposes a kind of LED drive circuit with constant current and equal properties of flow, is four
The LED load of the identical or different number in road provides constant current and stream output.
To achieve the above object, the technical scheme is that：A kind of LED driving electricity with constant current and equal properties of flow
Road, including first switch pipe, second switch pipe, third switching tube, the 4th switching tube, the first resonant inductance, the second resonant inductance,
First capacitance, the second capacitance, third capacitance, the 4th capacitance and LED light load circuit,
The LED light load circuit includes the first LED light string, the second LED light string, third LED light string, the 4th LED light string, first
Rectifier diode, the second rectifier diode, third rectifier diode and the 4th rectifier diode；
The drain electrode of the first switch pipe and the anode of power supply, the drain electrode of third switching tube connect, the source of the first switch pipe
Pole is connect with the drain electrode of second switch pipe, one end of the first capacitance, the source electrode of the second switch pipe and the cathode of power supply, first
One end of resonant inductance is connected with the source electrode of the 4th switching tube, the drain electrode of the source electrode and the 4th switching tube of the third switching tube,
One end connection of second resonant inductance, the other end of first capacitance and the other end of the first resonant inductance, the second capacitance
One end is connected with one end of third capacitance, the other end of second capacitance and the anode of the first rectifier diode, the second rectification
The cathode connection of diode, the cathode of first rectifier diode are connect with one end of the first LED light string, second rectification
The anode of diode is connect with one end of the second LED light string, the other end of the third capacitance and the sun of third rectifier diode
Pole, the cathode connection of the 4th rectifier diode, the cathode of the third rectifier diode are connect with one end of third LED light string,
The anode of 4th rectifier diode is connect with one end of the 4th LED light string, the other end of second LED light string, third
The other end of LED light string is connect with one end of the 4th capacitance, and the other end of the 4th capacitance is another with the first LED light string
End, the other end of the 4th LED light string, the second resonant inductance the other end connection, first LED light string, the second LED light string,
The conducting direction of third LED light string and the 4th LED light string is whole with the first rectifier diode, the second rectifier diode, third respectively
The conducting direction for flowing diode and the 4th rectifier diode is identical.
Further, first LED light string, the second LED light string, third LED light string and the 4th LED light string are in parallel respectively
There are the first filter capacitor, the second filter capacitor, third filter capacitor and the 4th filter capacitor.
Further, LED light in first LED light string, the second LED light string, third LED light string and the 4th LED light string
Number can be identical or different.
Further, the first switch pipe and second switch pipe, third switching tube and the 4th switching tube are complementary work
Work, first switch pipe and the 4th switching tube while break-make, second switch pipe and third switching tube while break-make.
Compared with prior art, the present invention has advantageous effect：The LED load of the identical or different number in tetra- tunnels of Ke Wei provides
Constant current and stream output, have inherent automatic constant current and equal properties of flow, also with topological structure is simple, component number is few and easy
In realize the characteristics of.
Description of the drawings
Fig. 1 is the LED drive circuit schematic diagram that the present invention has constant current and equal properties of flow；
Fig. 2 is current wave when four paths of LEDs load resistances are respectively 50 Europe, 80 Europe, 100 Europe and 120 Europe in one embodiment of the invention
Shape analogous diagram；
Fig. 3 is current waveform analogous diagram when four paths of LEDs load resistances are 50 Europe in one embodiment of the invention；
Fig. 4 is current waveform analogous diagram when four paths of LEDs load resistances are 120 Europe in one embodiment of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
As shown in Figure 1, a kind of LED drive circuit with constant current and equal properties of flow, by DC power supply, constant-current network,
Flow network and LED load composition, specifically include first switch pipe Q1, second switch pipe Q2, third switching tube Q3, the 4th switching tube
Q4, the first resonant inductance L1, the second resonant inductance L2, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4
With LED light load circuit.DC power supply, generally prime pfc circuit output voltage.
The LED light load circuit includes the first LED light string LED11 ... LED1n, the second LED light string LED21 ...
LED2n, third LED light string LED31 ... LED3n, the 4th LED light string LED41 ... LED4n, the first rectifier diode D1, second
Rectifier diode D2, third rectifier diode D3 and the 4th rectifier diode D4；The drain electrode of the first switch pipe Q1 and direct current
The drain electrode connection of the anode, third switching tube Q3 of power supply Vin, the source electrode of the first switch pipe Q1 and the leakage of second switch pipe Q2
Pole, one end connection of the first capacitance C1, the source electrode of the second switch pipe Q2 and the cathode of DC power supply Vin, the first resonance electricity
One end of sense L1 is connected with the source electrode of the 4th switching tube Q4, the leakage of the source electrode and the 4th switching tube Q4 of the third switching tube Q3
Pole, one end connection of the second resonant inductance L2, the other end of the first capacitance C1 and the other end of the first resonant inductance L1, the
One end of two capacitance C2 is connected with one end of third capacitance C3, the other end and the first rectifier diode D1 of the second capacitance C2
Anode, the second rectifier diode D2 cathode connection, the cathode and the first LED light string of the first rectifier diode D1
One end connection of LED11 ... LED1n, the anode and the second LED light string LED21 ... LED2n of the second rectifier diode D2
One end connection, the other end of the third capacitance C3 and the anode of third rectifier diode D3, the 4th rectifier diode D4
Cathode connects, and the cathode of the third rectifier diode D3 is connect with one end of third LED light string LED31 ... LED3n, described
The anode of 4th rectifier diode D4 is connect with one end of the 4th LED light string LED41 ... LED4n, second LED light string
The other end of LED21 ... LED2n, the other end of third LED light string LED31 ... LED3n are connect with one end of the 4th capacitance C4,
The other end of the 4th capacitance C4 and the other end, the 4th LED light string LED41 ... of the first LED light string LED11 ... LED1n
The other end connection of the other end of LED4n, the second resonant inductance L2, first LED light string, the second LED light string, the 3rd LED
The conducting direction of lamp string and the 4th LED light string respectively with the first rectifier diode, the second rectifier diode, third rectifier diode
It is identical with the conducting direction of the 4th rectifier diode.
The first LED light string LED11 ... LED1n, the second LED light string LED21 ... LED2n, third LED light string
LED31 ... LED3n and the 4th LED light string LED41 ... LED4n are parallel with the first filter capacitor C10, the second filter capacitor respectively
C20, third filter capacitor C30 and the 4th filter capacitor C40.
The first LED light string LED11 ... LED1n, the second LED light string LED21 ... LED2n, third LED light string
LED light number can be identical or different in LED31 ... LED3n and the 4th LED light string LED41 ... LED4n.
The first switch pipe Q1 and second switch pipe Q2, third switching tube Q3 and the 4th switching tube Q4 are complementary work
Work, first switch pipe Q1 and the 4th switching tube Q4 while break-make, second switch pipe Q2 and third switching tube Q3 while break-make.
By first to fourth switching tube Q1, Q2, Q3, Q4, the first resonant inductance L1, the second resonant inductance L2, the first capacitance
C1, the second capacitance C2 and third capacitance C3 composition full-bridge constant current resonant networks, realize that four paths of LEDs load total current is constant；Resonance
Network output is connected by the second capacitance C2, third capacitance C3 and the 4th capacitance C4 with the load of four paths of LEDs, full-bridge constant-current network work
Work generates constant AC signal under constant current resonant frequency, is given by the second capacitance C2, third capacitance C3 and the 4th capacitance C4
Four paths of LEDs load supplyings.Second capacitance C2 realizes the stream of the first via and the second paths of LEDs lamp string, and third capacitance C3 realizes third
Road and the stream of the 4th paths of LEDs lamp string, the 4th capacitance C4 realize the stream of the second road and third paths of LEDs lamp string, it is achieved thereby that
The stream of four paths of LEDs lamp strings.Since four paths of LEDs circuits flow, each paths of LEDs lamp string is constant current operation
Fig. 2 is current waveform analogous diagram when four paths of LEDs load resistances are respectively 50 Europe, 80 Europe, 100 Europe and 120 Europe；Fig. 3 is four
Current waveform analogous diagram when paths of LEDs load resistance is 50 Europe；Fig. 4 is four paths of LEDs load resistances current waveform when being 120 Europe
Analogous diagram.Different loads resistance represents the LED light string of different numbers respectively.In from Fig. 2 to Fig. 4 as can be seen that when four tunnels load
The electric current that four paths of LEDs lamp strings are flowed through when resistance is identical or different, under stable state is of substantially equal, it is achieved that four paths of LEDs lamp strings
Constant current and flow work.
Particular embodiments described above elaborates the purpose of the present invention, technical solution and achievement, is answered
Understand, the above is only a specific embodiment of the present invention, is not intended to restrict the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of LED drive circuit with constant current and equal properties of flow, which is characterized in that including first switch pipe, second switch
Pipe, third switching tube, the 4th switching tube, the first resonant inductance, the second resonant inductance, the first capacitance, the second capacitance, third electricity
Appearance, the 4th capacitance and LED light load circuit,
The LED light load circuit includes the first LED light string, the second LED light string, third LED light string, the 4th LED light string, first
Rectifier diode, the second rectifier diode, third rectifier diode and the 4th rectifier diode；
The drain electrode of the first switch pipe and the anode of power supply, the drain electrode of third switching tube connect, the source of the first switch pipe
Pole is connect with the drain electrode of second switch pipe, one end of the first capacitance, the source electrode of the second switch pipe and the cathode of power supply, first
One end of resonant inductance is connected with the source electrode of the 4th switching tube, the drain electrode of the source electrode and the 4th switching tube of the third switching tube,
One end connection of second resonant inductance, the other end of first capacitance and the other end of the first resonant inductance, the second capacitance
One end is connected with one end of third capacitance, the other end of second capacitance and the anode of the first rectifier diode, the second rectification
The cathode connection of diode, the cathode of first rectifier diode are connect with one end of the first LED light string, second rectification
The anode of diode is connect with one end of the second LED light string, the other end of the third capacitance and the sun of third rectifier diode
Pole, the cathode connection of the 4th rectifier diode, the cathode of the third rectifier diode are connect with one end of third LED light string,
The anode of 4th rectifier diode is connect with one end of the 4th LED light string, the other end of second LED light string, third
The other end of LED light string is connect with one end of the 4th capacitance, and the other end of the 4th capacitance is another with the first LED light string
End, the other end of the 4th LED light string, the second resonant inductance the other end connection, first LED light string, the second LED light string,
The conducting direction of third LED light string and the 4th LED light string is whole with the first rectifier diode, the second rectifier diode, third respectively
The conducting direction for flowing diode and the 4th rectifier diode is identical.
2. LED drive circuit according to claim 1, which is characterized in that first LED light string, the second LED light string,
Third LED light string and the 4th LED light string are parallel with the first filter capacitor, the second filter capacitor, third filter capacitor and respectively
Four filter capacitors.
3. LED drive circuit according to claim 1, which is characterized in that first LED light string, the second LED light string,
LED light number can be identical or different in third LED light string and the 4th LED light string.
4. LED drive circuit according to claim 1 or 2, which is characterized in that the first switch pipe and second switch
Pipe, third switching tube and the 4th switching tube are complementary duty, first switch pipe and the 4th switching tube break-make simultaneously, second switch
Pipe and third switching tube while break-make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046923.9A CN108235516B (en) | 2018-01-18 | 2018-01-18 | LED drive circuit with constant current and current sharing characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046923.9A CN108235516B (en) | 2018-01-18 | 2018-01-18 | LED drive circuit with constant current and current sharing characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108235516A true CN108235516A (en) | 2018-06-29 |
| CN108235516B CN108235516B (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810046923.9A Expired - Fee Related CN108235516B (en) | 2018-01-18 | 2018-01-18 | LED drive circuit with constant current and current sharing characteristics |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707838A (en) * | 2009-12-04 | 2010-05-12 | 英飞特电子（杭州）有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| CN102158096A (en) * | 2011-05-11 | 2011-08-17 | 南京博兰得电子科技有限公司 | Non-isolated resonant converter |
| CN103118460A (en) * | 2013-01-30 | 2013-05-22 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| US20130307427A1 (en) * | 2012-05-16 | 2013-11-21 | National Cheng Kung University | Current balancing led driver circuit and method therof |
| CN105744671A (en) * | 2016-02-23 | 2016-07-06 | 福州大学 | LED drive power supply employing non-isolated multi-path passive current balancing |
| CN106793290A (en) * | 2016-12-20 | 2017-05-31 | 福州大学 | A kind of isolated multipath flows LED drive power |
-
2018
- 2018-01-18 CN CN201810046923.9A patent/CN108235516B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707838A (en) * | 2009-12-04 | 2010-05-12 | 英飞特电子（杭州）有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| CN102158096A (en) * | 2011-05-11 | 2011-08-17 | 南京博兰得电子科技有限公司 | Non-isolated resonant converter |
| US20130307427A1 (en) * | 2012-05-16 | 2013-11-21 | National Cheng Kung University | Current balancing led driver circuit and method therof |
| CN103118460A (en) * | 2013-01-30 | 2013-05-22 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| CN105744671A (en) * | 2016-02-23 | 2016-07-06 | 福州大学 | LED drive power supply employing non-isolated multi-path passive current balancing |
| CN106793290A (en) * | 2016-12-20 | 2017-05-31 | 福州大学 | A kind of isolated multipath flows LED drive power |
Non-Patent Citations (1)
| Title |
|---|
| 杨琦: "谐振式单开关多路输出Boost LED驱动器研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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| CN108235516B (en) | 2020-04-10 |
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