CN108012385A - A kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit - Google Patents
A kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit Download PDFInfo
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- CN108012385A CN108012385A CN201810046658.4A CN201810046658A CN108012385A CN 108012385 A CN108012385 A CN 108012385A CN 201810046658 A CN201810046658 A CN 201810046658A CN 108012385 A CN108012385 A CN 108012385A
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to a kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit.Including full-bridge constant-current network, equalizing-current network and LED light load circuit.The full-bridge constant-current network is made of full-bridge switching network and resonant network, which has constant-current characteristics, and the equalizing-current network realizes that 4 paths of LEDs lamps flow work by capacitance stream.Constant current proposed by the invention and flow equalizing circuit, can load for the LED light of the identical or different number in 4 tunnels and provide constant current and stream output；Have the characteristics that topological structure is simple, component number is few, constant current and equal properties of flow are good and be easily achieved.
Description
Technical field
The present invention relates to a kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit.
Background technology
LED has the advantages that long lifespan, energy conservation and environmental protection are progressively favored be subject to people as a kind of new lighting source,
Become the focus of lighting area.LED C-V characteristic index of coincidence relations, the i.e. minor variations of voltage can cause electric current
Significant changes, and conduction voltage drop is greatly influenced by temperature, therefore LED has gradually formed common recognition using constant current driving.LED light
The light measurement performance such as brightness, luminous flux and luminous efficiency is directly related with LED drive current, the LED drive power of high efficient and reliable
It is the key of LED illumination fast development.
To meet brightness uniformity requirement, it need to ensure that the electric current for flowing through every LED is equal.Simplest method is will be multiple
LED light is connected in series, but excessive LED series connection can make that driving voltage is excessive, reliability reduces.In practical application, great power LED
Illumination is both needed to connect by the way of LED connection in series-parallel is combined, when multiple LED branch circuit parallel connections are in same voltage source, due to leading
Energization pressure has differences, and the electric current in each LED branches is not fully equal, the LED light of the big branch of electric current easily occur light decay,
Aging, reduces the life and reliability of LED light.To ensure that LED outputs reach the requirement such as brightness, colourity-cause, it is necessary to adopt
It just can guarantee that the forward current of each string LED is equal with stream measure.
The content of the invention
Can be that 4 tunnels are identical or not it is an object of the invention to provide a kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit
LED light load with number provides constant current and stream output；With topological structure is simple, component number is few, constant current and Jun Liute
Property it is good and the features such as be easily achieved.
To achieve the above object, the technical scheme is that：A kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit,
Including full-bridge constant-current network, equalizing-current network and LED light load circuit, the full-bridge constant-current network is by full-bridge switching network and resonance
Network forms；The full-bridge switching network includes the 1st to the 4th switching tube, the resonant network include the 1st inductance, the 2nd inductance,
Resonant capacitance, the equalizing-current network include the 1st to the 3rd equal galvanic electricity appearance, the 1st to the 4th rectifier diode, the LED light load electricity
Road includes 4 paths of LEDs lamp loads；The leakage of one end, the 3rd switching tube that the drain electrode of the 1st switching tube is held with positive pole, the 3rd equal galvanic electricity
Pole connects, and the source electrode of the 1st switching tube is connected with the drain electrode of the 2nd switching tube, one end of the 1st inductance, source electrode and the electricity of the 2nd switching tube
Source anode, the source electrode connection of one end of resonant capacitance, the 4th switching tube, the source electrode of the 3rd switching tube and one end of the 2nd inductance, the 4th
The drain electrode connection of switching tube, one end that the other end of the 1st inductance holds with the 1st to the 2nd equal galvanic electricity respectively are connected, and the 1st equal galvanic electricity is held
The other end anode with the 1st rectifier diode, the cathode of the 2nd rectifier diode are connected respectively, the cathode of the 1st rectifier diode
It is connected through the 1st paths of LEDs lamp load, the 4th paths of LEDs lamp load with the anode of the 4th rectifier diode, the 1st paths of LEDs lamp load and the 4th
The tie point of paths of LEDs lamp load be connected with the other end that the 3rd equal galvanic electricity is held, the other end of the 2nd equal galvanic electricity appearance respectively with the 3rd rectification
The cathode connection of the anode of diode, the 4th rectifier diode, the cathode of the 3rd rectifier diode is through the 3rd paths of LEDs lamp load, the 2nd
Paths of LEDs lamp load is connected with the anode of the 2nd rectifier diode, the tie point of the 2nd paths of LEDs lamp load and the 3rd paths of LEDs lamp load with
The other end connection of the other end of resonant capacitance, the 2nd inductance.
In an embodiment of the present invention, the equalizing-current network further includes the 1st to the 4th filter capacitor, the 1st to the 4th filter
Ripple capacitance is parallel to the both ends of the 1st to the 4th paths of LEDs lamp load respectively.
In an embodiment of the present invention, each paths of LEDs lamp load of the LED light load circuit is more by what is be connected in series
A LED light composition.
In an embodiment of the present invention, the LED light number of each paths of LEDs lamp load is identical or different.
In an embodiment of the present invention, the 1st switching tube and the 2nd switching tube, the 3rd switching tube and the 4th switching tube are complementation
Work, the 1st switching tube and the 4th switching tube while break-make, the 2nd switching tube and the 3rd switching tube while break-make.
Compared to the prior art, the invention has the advantages that：Circuit of the present invention can be the identical or different number in 4 tunnels
LED light load provide constant current and stream export；With topological structure is simple, component number is few, constant current and equal properties of flow it is good and
The features such as being easily achieved.
Brief description of the drawings
Fig. 1 is the non-isolated multi-path flow equalizing full-bridge LED drive circuit schematic diagram of the present invention.
Current simulations waveform when tetra- road load resistances of Tu2Wei are respectively 10 Europe, 50 Europe, 80 Europe and 100 Europe.
Current simulations waveform when tetra- road load resistances of Tu3Wei are all 10 Europe.
Current simulations waveform when tetra- road load resistances of Tu4Wei are all 80 Europe.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
The present invention a kind of non-isolated multi-path flow equalizing full-bridge LED drive circuit, including full-bridge constant-current network, equalizing-current network and
LED light load circuit, the full-bridge constant-current network are made of full-bridge switching network and resonant network；The full-bridge switching network bag
The the 1st to the 4th switching tube is included, the resonant network includes the 1st inductance, the 2nd inductance, resonant capacitance, and the equalizing-current network includes the 1st
To the 3rd equal galvanic electricity appearance, the 1st to the 4th rectifier diode, the LED light load circuit includes 4 paths of LEDs lamp loads；1st switching tube
Drain electrode and positive pole, the drain electrode of one end, the 3rd switching tube held of the 3rd equal galvanic electricity be connected, the source electrode of the 1st switching tube is opened with the 2nd
Close drain electrode, one end connection of the 1st inductance of pipe, source electrode and power cathode, one end of resonant capacitance, the 4th switch of the 2nd switching tube
The source electrode connection of pipe, the source electrode of the 3rd switching tube is connected with the drain electrode of one end, the 4th switching tube of the 2nd inductance, the 1st inductance it is another
One end that end holds with the 1st to the 2nd equal galvanic electricity respectively be connected, the other end of the 1st equal galvanic electricity appearance sun with the 1st rectifier diode respectively
Pole, the cathode connection of the 2nd rectifier diode, the cathode of the 1st rectifier diode is through the 1st paths of LEDs lamp load, the 4th paths of LEDs lamp load
It is connected with the anode of the 4th rectifier diode, the 1st paths of LEDs lamp load and the tie point of the 4th paths of LEDs lamp load and the 3rd equal galvanic electricity hold
Other end connection, the cathode of the other end that the 2nd equal galvanic electricity the is held anode with the 3rd rectifier diode, the 4th rectifier diode respectively
Connection, anode of the cathode through the 3rd paths of LEDs lamp load, the 2nd paths of LEDs lamp load and the 2nd rectifier diode of the 3rd rectifier diode
Connection, the other end, the other end of the 2nd inductance of the tie point and resonant capacitance of the 2nd paths of LEDs lamp load and the 3rd paths of LEDs lamp load
Connection.The equalizing-current network further includes the 1st to the 4th filter capacitor, and the described 1st to the 4th filter capacitor is parallel to the 1st to respectively
The both ends of 4 paths of LEDs lamp loads.
Each paths of LEDs lamp load of the LED light load circuit is formed by the multiple LED light being connected in series.It is described every
The LED light number of LED light load is identical or different all the way.
1st switching tube and the 2nd switching tube, the 3rd switching tube and the 4th switching tube are complementary duty, the 1st switching tube and the 4th
Switching tube while break-make, the 2nd switching tube and the 3rd switching tube while break-make.
It is below the specific embodiment of the present invention.
As shown in Figure 1, non-isolated multi-path flow equalizing full-bridge LED drive circuit, by full-bridge switching network, resonant network, flows
Network and LED load circuit composition.Switching tube Q1, Q2, Q3 and Q4 form full-bridge switching network, and wherein Q1 and Q2, Q3 and Q4 is equal
For complementary duty, Q1 and Q4 break-make at the same time, Q2 and Q3 break-make at the same time.
Four paths of LEDs being made of rectifying and wave-filtering and LED light string load, and first via LED load is by rectifier diode D1, filtering
Capacitance C10 and lamp string LED11 ... LED1n compositions；Second paths of LEDs is loaded by rectifier diode D2, filter capacitor C20 and lamp string
LED21 ... LED2n are formed；3rd paths of LEDs is loaded by rectifier diode D3, filter capacitor C30 and lamp string LED31 ... LED3n
Composition；The load of 4th paths of LEDs is made of rectifier diode D4, filter capacitor C40 and lamp string LED41 ... LED4n.The first via and
3rd paths of LEDs, which is supported on when Q1, Q4 are simultaneously turned on, to work；Second road and the 4th paths of LEDs are supported on work when Q2, Q3 are simultaneously turned on
Make.
Full-bridge is formed by switching tube Q1, Q2, Q3, Q4, the first resonant inductance L1, the second resonant inductance L2 and resonant capacitance C4
Constant current resonant network, realizes that the load of the second paths of LEDs and the 3rd paths of LEDs load total current are constant, resonant network output passes through first
Equal galvanic electricity holds C1, the second equal galvanic electricity holds C2 and is connected with the load of four paths of LEDs, and full-bridge constant-current network is operated under constant current resonant frequency and produces
Raw constant AC signal, holds C1, the second equal galvanic electricity holds C2 and gives four paths of LEDs load supplyings by the first equal galvanic electricity.First flows
Capacitance C1 realizes the stream of the first via and the load of the second paths of LEDs, and the second equal galvanic electricity holds C2 and realizes the 3rd road and the load of the 4th paths of LEDs
Stream, the 3rd equal galvanic electricity holds the stream that C3 realizes the first via and the load of the 4th paths of LEDs.Since four paths of LEDs circuits flow,
Therefore each paths of LEDs lamp string is constant current operation；
Second road and the 3rd paths of LEDs load one end and are connected respectively with the first equal equal galvanic electricity appearance C2 of galvanic electricity appearance C1 and second, the other end
Both are connected after being connected with resonant network；The first via and the 4th paths of LEDs load one end and hold C1 and second with the first equal galvanic electricity respectively
Equal galvanic electricity holds C2 and is connected, and both other ends hold C3 by the 3rd equal galvanic electricity after being connected and are connected with circuit input power cathode, make
The summation for obtaining 4 paths of LEDs lamp currents is twice of constant-current network output current, has switch tube current should under equal output power
The advantages that power is small, output ripple is small.
Current waveform when tetra- road load resistances of Tu2Wei are respectively 10 Europe, 50 Europe, 80 Europe and 100 Europe.Tetra- tunnels of Tu3Wei load
Current waveform when resistance is all 10 Europe.Current waveform when tetra- road load resistances of Tu4Wei are all 80 Europe.Different loads resistance distinguishes table
Show the LED light string of different numbers.In from Fig. 2 to Fig. 4 as can be seen that when four road load resistances are identical or different, stable state flows down
Cross that the electric current of four paths of LEDs lamp strings is of substantially equal, it is achieved that the constant current of four paths of LEDs lamp strings and flowing work.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, caused function are made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (5)
- A kind of 1. non-isolated multi-path flow equalizing full-bridge LED drive circuit, it is characterised in that：Including full-bridge constant-current network, equalizing-current network With LED light load circuit, the full-bridge constant-current network is made of full-bridge switching network and resonant network；The full-bridge switching network Including the 1st to the 4th switching tube, the resonant network includes the 1st inductance, the 2nd inductance, resonant capacitance, and the equalizing-current network includes 1st to the 3rd equal galvanic electricity is held, the 1st to the 4th rectifier diode, and the LED light load circuit includes 4 paths of LEDs lamp loads；1st switch The drain electrode of one end, the 3rd switching tube that the drain electrode of pipe is held with positive pole, the 3rd equal galvanic electricity is connected, the source electrode and the 2nd of the 1st switching tube The drain electrode of switching tube, one end connection of the 1st inductance, source electrode and power cathode, one end of resonant capacitance, the 4th of the 2nd switching tube are opened Close the source electrode connection of pipe, the source electrode of the 3rd switching tube is connected with the drain electrode of one end, the 4th switching tube of the 2nd inductance, the 1st inductance it is another One end that one end holds with the 1st to the 2nd equal galvanic electricity respectively be connected, the other end of the 1st equal galvanic electricity appearance respectively with the 1st rectifier diode The cathode connection of anode, the 2nd rectifier diode, the cathode of the 1st rectifier diode are born through the 1st paths of LEDs lamp load, the 4th paths of LEDs lamp Load is connected with the anode of the 4th rectifier diode, the tie point and the 3rd equal galvanic electricity of the 1st paths of LEDs lamp load and the 4th paths of LEDs lamp load The other end connection of appearance, the moon of the other end that the 2nd equal galvanic electricity the is held anode with the 3rd rectifier diode, the 4th rectifier diode respectively Pole connects, sun of the cathode through the 3rd paths of LEDs lamp load, the 2nd paths of LEDs lamp load and the 2nd rectifier diode of the 3rd rectifier diode Pole connects, the other end of the tie point and resonant capacitance of the 2nd paths of LEDs lamp load and the 3rd paths of LEDs lamp load, the 2nd inductance it is another End connection.
- A kind of 2. non-isolated multi-path flow equalizing full-bridge LED drive circuit according to claim 1, it is characterised in that：It is described equal Flow network further includes the 1st to the 4th filter capacitor, and the 1st to the 4th filter capacitor is parallel to the 1st to the 4th paths of LEDs lamp and bears respectively The both ends of load.
- A kind of 3. non-isolated multi-path flow equalizing full-bridge LED drive circuit according to claim 1 or 2, it is characterised in that：It is described Each paths of LEDs lamp load of LED light load circuit is formed by the multiple LED light being connected in series.
- A kind of 4. non-isolated multi-path flow equalizing full-bridge LED drive circuit according to claim 3, it is characterised in that：It is described every The LED light number of LED light load is identical or different all the way.
- A kind of 5. non-isolated multi-path flow equalizing full-bridge LED drive circuit according to claim 1 or 2, it is characterised in that：1st Switching tube and the 2nd switching tube, the 3rd switching tube and the 4th switching tube are complementary duty, and the 1st switching tube and the 4th switching tube lead at the same time It is disconnected, the 2nd switching tube and the 3rd switching tube while break-make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046658.4A CN108012385B (en) | 2018-01-18 | 2018-01-18 | Non-isolated multi-path current-sharing full-bridge LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046658.4A CN108012385B (en) | 2018-01-18 | 2018-01-18 | Non-isolated multi-path current-sharing full-bridge LED drive circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN108012385A true CN108012385A (en) | 2018-05-08 |
| CN108012385B CN108012385B (en) | 2019-12-31 |
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| CN201810046658.4A Expired - Fee Related CN108012385B (en) | 2018-01-18 | 2018-01-18 | Non-isolated multi-path current-sharing full-bridge LED drive circuit |
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| 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 |
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| 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 |
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| CN105744671A (en) * | 2016-02-23 | 2016-07-06 | 福州大学 | LED drive power supply employing non-isolated multi-path passive current balancing |
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-
2018
- 2018-01-18 CN CN201810046658.4A patent/CN108012385B/en not_active Expired - Fee Related
Patent Citations (6)
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| 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 |
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