CN108012385B - Non-isolated multi-path current-sharing full-bridge LED drive circuit - Google Patents
Non-isolated multi-path current-sharing full-bridge LED drive circuit Download PDFInfo
- Publication number
- CN108012385B CN108012385B CN201810046658.4A CN201810046658A CN108012385B CN 108012385 B CN108012385 B CN 108012385B CN 201810046658 A CN201810046658 A CN 201810046658A CN 108012385 B CN108012385 B CN 108012385B
- Authority
- CN
- China
- Prior art keywords
- current
- sharing
- switch tube
- led lamp
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to a non-isolated multi-path current-sharing full-bridge LED driving circuit. The LED lamp load circuit comprises a full-bridge constant current network, a current equalizing network and an LED lamp load circuit. The full-bridge constant current network is composed of a full-bridge switch network and a resonant network, the full-bridge constant current network has a constant current characteristic, and the current-sharing network realizes current-sharing work of the 4-path LED lamps through capacitor current sharing. The constant current and current sharing circuit provided by the invention can provide constant current and current sharing output for 4 paths of LED lamp loads with the same or different numbers; the current sharing circuit has the characteristics of simple topological structure, small element number, good constant current and current sharing characteristics, easiness in implementation and the like.
Description
Technical Field
The invention relates to a non-isolated multi-path current-sharing full-bridge LED driving circuit.
Background
As a novel illumination light source, the LED has the advantages of long service life, energy saving, environmental protection, and the like, and is gradually favored by people, and becomes the focus of attention in the illumination field. The current-voltage characteristics of the LED conform to an exponential relationship, that is, a small change in voltage causes a significant change in current, and the conduction voltage drop is greatly affected by temperature, so that the LED is gradually driven by a constant current. The luminosity performances of the LED lamp such as brightness, luminous flux, luminous efficiency and the like are directly related to the LED driving current, and the efficient and reliable LED driving power supply is the key for the rapid development of LED illumination.
To meet the requirement of uniform brightness, it is necessary to ensure that the current flowing through each LED is equal. The simplest method is to connect a plurality of LED lamps in series, but too many LEDs in series will cause too high driving voltage and reduced reliability. In practical application, the high-power LED illumination is connected in a mode of combining series connection and parallel connection of LEDs, when a plurality of LED branches are connected in parallel to the same voltage source, due to the difference of conduction voltages, currents in each LED branch are not completely equal, the LED lamps of the branches with large currents are prone to light decay and aging, and the service life and reliability of the LED lamps are reduced. In order to ensure that the output of the LEDs meets the requirements of brightness, chromaticity-uniformity, etc., current sharing measures are required to ensure that the forward currents of the LEDs in each string are equal.
Disclosure of Invention
The invention aims to provide a non-isolated multi-path current-sharing full-bridge LED driving circuit which can provide constant current and current-sharing output for 4 paths of LED lamp loads with the same or different numbers; the current sharing circuit has the characteristics of simple topological structure, small element number, good constant current and current sharing characteristics, easiness in implementation and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows: a non-isolated multi-path current-sharing full-bridge LED driving circuit comprises a full-bridge constant current network, a current-sharing network and an LED lamp load circuit, wherein the full-bridge constant current network consists of a full-bridge switch network and a resonant network; the full-bridge switch network comprises 1 st to 4 th switch tubes, the resonance network comprises 1 st inductors, 2 nd inductors and resonance capacitors, the current-sharing network comprises 1 st to 3 rd current-sharing capacitors and 1 st to 4 th rectifier diodes, and the LED lamp load circuit comprises 4 paths of LED lamp loads; the drain electrode of the 1 st switch tube is connected with the positive electrode of a power supply, one end of a 3 rd current-sharing capacitor and the drain electrode of the 3 rd switch tube, the source electrode of the 1 st switch tube is connected with the drain electrode of the 2 nd switch tube and one end of a 1 st inductor, the source electrode of the 2 nd switch tube is connected with the negative electrode of the power supply, one end of a resonance capacitor and the source electrode of a 4 th switch tube, the source electrode of the 3 rd switch tube is connected with one end of the 2 nd inductor and the drain electrode of the 4 th switch tube, the other end of the 1 st inductor is respectively connected with one end of the 1 st to the 2 nd current-sharing capacitors, the other end of the 1 st current-sharing capacitor is respectively connected with the anode of the 1 st rectifier diode and the cathode of the 2 nd rectifier diode, the cathode of the 1 st rectifier diode is connected with the anode of the 4 th rectifier diode through the 1 st LED lamp load and the 4 th LED lamp load, the connecting point of, the other end of the 2 nd current-sharing capacitor is respectively connected with the anode of the 3 rd rectifier diode and the cathode of the 4 th rectifier diode, the cathode of the 3 rd rectifier diode is connected with the anode of the 2 nd rectifier diode through the 3 rd LED lamp load and the 2 nd LED lamp load, and the connecting point of the 2 nd LED lamp load and the 3 rd LED lamp load is connected with the other end of the resonant capacitor and the other end of the 2 nd inductor.
In an embodiment of the present invention, the current sharing network further includes a 1 st to a 4 th filter capacitors, and the 1 st to the 4 th filter capacitors are respectively connected in parallel to two ends of the 1 st to the 4 th LED lamp loads.
In an embodiment of the invention, each LED lamp load of the LED lamp load circuit is composed of a plurality of LED lamps connected in series.
In an embodiment of the present invention, the number of the LED lamps in each LED lamp load is the same or different.
In an embodiment of the invention, the 1 st switch tube and the 2 nd switch tube, and the 3 rd switch tube and the 4 th switch tube are complementary, the 1 st switch tube and the 4 th switch tube are simultaneously switched on and off, and the 2 nd switch tube and the 3 rd switch tube are simultaneously switched on and off.
Compared with the prior art, the invention has the following beneficial effects: the circuit can provide constant current and current-sharing output for 4 paths of LED lamp loads with the same or different numbers; the current sharing circuit has the characteristics of simple topological structure, small element number, good constant current and current sharing characteristics, easiness in implementation and the like.
Drawings
Fig. 1 is a schematic diagram of a non-isolated multi-path current-sharing full-bridge LED driving circuit according to the present invention.
Fig. 2 shows current simulation waveforms for 10 ohm, 50 ohm, 80 ohm and 100 ohm time of four-way load resistance.
Fig. 3 is a current simulation waveform when four load resistors are all 10 ohms.
Fig. 4 is a current simulation waveform when all four load resistors are 80 ohms.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention discloses a non-isolated multi-path current-sharing full-bridge LED driving circuit, which comprises a full-bridge constant current network, a current-sharing network and an LED lamp load circuit, wherein the full-bridge constant current network consists of a full-bridge switch network and a resonant network; the full-bridge switch network comprises 1 st to 4 th switch tubes, the resonance network comprises 1 st inductors, 2 nd inductors and resonance capacitors, the current-sharing network comprises 1 st to 3 rd current-sharing capacitors and 1 st to 4 th rectifier diodes, and the LED lamp load circuit comprises 4 paths of LED lamp loads; the drain electrode of the 1 st switch tube is connected with the positive electrode of a power supply, one end of a 3 rd current-sharing capacitor and the drain electrode of the 3 rd switch tube, the source electrode of the 1 st switch tube is connected with the drain electrode of the 2 nd switch tube and one end of a 1 st inductor, the source electrode of the 2 nd switch tube is connected with the negative electrode of the power supply, one end of a resonance capacitor and the source electrode of a 4 th switch tube, the source electrode of the 3 rd switch tube is connected with one end of the 2 nd inductor and the drain electrode of the 4 th switch tube, the other end of the 1 st inductor is respectively connected with one end of the 1 st to the 2 nd current-sharing capacitors, the other end of the 1 st current-sharing capacitor is respectively connected with the anode of the 1 st rectifier diode and the cathode of the 2 nd rectifier diode, the cathode of the 1 st rectifier diode is connected with the anode of the 4 th rectifier diode through the 1 st LED lamp load and the 4 th LED lamp load, the connecting point of, the other end of the 2 nd current-sharing capacitor is respectively connected with the anode of the 3 rd rectifier diode and the cathode of the 4 th rectifier diode, the cathode of the 3 rd rectifier diode is connected with the anode of the 2 nd rectifier diode through the 3 rd LED lamp load and the 2 nd LED lamp load, and the connecting point of the 2 nd LED lamp load and the 3 rd LED lamp load is connected with the other end of the resonant capacitor and the other end of the 2 nd inductor. The current-sharing network further comprises 1 st to 4 th filter capacitors, and the 1 st to 4 th filter capacitors are respectively connected in parallel to two ends of the 1 st to 4 th LED lamp loads.
Each path of LED lamp load of the LED lamp load circuit consists of a plurality of LED lamps which are connected in series. The number of the LED lamps of each path of LED lamp load is the same or different.
The 1 st switch tube and the 2 nd switch tube, the 3 rd switch tube and the 4 th switch tube are complementary work, the 1 st switch tube and the 4 th switch tube are switched on and off simultaneously, and the 2 nd switch tube and the 3 rd switch tube are switched on and off simultaneously.
The following is a specific embodiment of the present invention.
As shown in fig. 1, the non-isolated multi-path current-sharing full-bridge LED driving circuit is composed of a full-bridge switch network, a resonant network, a current-sharing network and an LED load circuit. The switching tubes Q1, Q2, Q3 and Q4 form a full-bridge switching network, wherein Q1 and Q2, Q3 and Q4 are in complementary work, Q1 and Q4 are switched on and off at the same time, and Q2 and Q3 are switched on and off at the same time.
The LED load comprises four paths of LED loads consisting of rectifying and filtering and LED lamp strings, wherein the first path of LED load consists of a rectifying diode D1, a filtering capacitor C10 and lamp strings LED11 and … LED1 n; the second path of LED load consists of a rectifier diode D2, a filter capacitor C20 and string LEDs 21 and … LED2 n; the third path of LED load consists of a rectifier diode D3, a filter capacitor C30 and string LEDs 31 and … LED3 n; the fourth path of LED load consists of a rectifier diode D4, a filter capacitor C40 and string LEDs 41, … and LED4 n. The first path and the third path of LED loads work when Q1 and Q4 are simultaneously conducted; the second LED load and the fourth LED load work when Q2 and Q3 are simultaneously conducted.
A full-bridge constant-current resonant network is formed by switching tubes Q1, Q2, Q3, Q4, a first resonant inductor L1, a second resonant inductor L2 and a resonant capacitor C4, so that the total current of a second path of LED load and a third path of LED load is constant, the output of the resonant network is connected with four paths of LED loads through a first current-sharing capacitor C1 and a second current-sharing capacitor C2, the full-bridge constant-current network works at constant-current resonant frequency to generate constant alternating current signals, and the four paths of LED loads are supplied with power through a first current-sharing capacitor C1 and a second current-sharing capacitor C2. The first current-sharing capacitor C1 realizes current sharing of the first LED load and the second LED load, the second current-sharing capacitor C2 realizes current sharing of the third LED load and the fourth LED load, and the third current-sharing capacitor C3 realizes current sharing of the first LED load and the fourth LED load. Because the four paths of LED circuits are current-sharing, each path of LED lamp string works in a constant current mode;
one ends of the second path of LED load and the third path of LED load are respectively connected with the first current-sharing capacitor C1 and the second current-sharing capacitor C2, and the other ends of the second path of LED load and the third path of LED load are connected with the resonant network after being connected with each other; one end of each of the first path of LED load and the fourth path of LED load is connected with a first current-sharing capacitor C1 and a second current-sharing capacitor C2 respectively, and the other end of each of the first path of LED load and the fourth path of LED load is connected with the anode of a circuit input power supply through a third current-sharing capacitor C3 after being connected with each other, so that the sum of the current of the 4 paths of LED lamps is twice of the output current of the constant current network.
Fig. 2 shows current waveforms for four load resistors of 10 ohms, 50 ohms, 80 ohms and 100 ohms, respectively. Fig. 3 shows the current waveform when the four load resistors are all 10 ohms. Fig. 4 shows the current waveform when the four load resistors are all 80 ohms. Different load resistors respectively represent different numbers of LED lamp strings. As can be seen from fig. 2 to 4, when the four load resistors are the same or different, the currents flowing through the four LED strings in the steady state are substantially equal, so that the constant current and the current sharing operation of the four LED strings are realized.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (5)
1. The utility model provides a non-isolation multichannel full-bridge LED drive circuit that flow equalizes which characterized in that: the LED lamp driving circuit comprises a full-bridge constant current network, a current equalizing network and an LED lamp load circuit, wherein the full-bridge constant current network consists of a full-bridge switch network and a resonant network; the full-bridge switch network comprises 1 st to 4 th switch tubes, the resonance network comprises 1 st inductors, 2 nd inductors and resonance capacitors, the current-sharing network comprises 1 st to 3 rd current-sharing capacitors and 1 st to 4 th rectifier diodes, and the LED lamp load circuit comprises 4 paths of LED lamp loads; the drain electrode of the 1 st switch tube is connected with the positive electrode of a power supply, one end of a 3 rd current-sharing capacitor and the drain electrode of the 3 rd switch tube, the source electrode of the 1 st switch tube is connected with the drain electrode of the 2 nd switch tube and one end of a 1 st inductor, the source electrode of the 2 nd switch tube is connected with the negative electrode of the power supply, one end of a resonance capacitor and the source electrode of a 4 th switch tube, the source electrode of the 3 rd switch tube is connected with one end of the 2 nd inductor and the drain electrode of the 4 th switch tube, the other end of the 1 st inductor is respectively connected with one end of the 1 st to the 2 nd current-sharing capacitors, the other end of the 1 st current-sharing capacitor is respectively connected with the anode of the 1 st rectifier diode and the cathode of the 2 nd rectifier diode, the cathode of the 1 st rectifier diode is connected with the anode of the 4 th rectifier diode through the 1 st LED lamp load and the 4 th LED lamp load, the connecting point of, the other end of the 2 nd current-sharing capacitor is respectively connected with the anode of the 3 rd rectifier diode and the cathode of the 4 th rectifier diode, the cathode of the 3 rd rectifier diode is connected with the anode of the 2 nd rectifier diode through the 3 rd LED lamp load and the 2 nd LED lamp load, and the connecting point of the 2 nd LED lamp load and the 3 rd LED lamp load is connected with the other end of the resonant capacitor and the other end of the 2 nd inductor.
2. The non-isolated multi-path current-sharing full-bridge LED driving circuit according to claim 1, wherein: the current-sharing network further comprises 1 st to 4 th filter capacitors, and the 1 st to 4 th filter capacitors are respectively connected in parallel to two ends of the 1 st to 4 th LED lamp loads.
3. The non-isolated multi-path current-sharing full-bridge LED driving circuit according to claim 1 or 2, wherein: each path of LED lamp load of the LED lamp load circuit consists of a plurality of LED lamps which are connected in series.
4. The non-isolated multi-path current-sharing full-bridge LED driving circuit according to claim 3, wherein: the number of the LED lamps of each path of LED lamp load is the same or different.
5. The non-isolated multi-path current-sharing full-bridge LED driving circuit according to claim 1 or 2, wherein: the 1 st switch tube and the 2 nd switch tube are complementary, the 3 rd switch tube and the 4 th switch tube are complementary, the 1 st switch tube and the 4 th switch tube are simultaneously switched on and switched off, and the 2 nd switch tube and the 3 rd switch tube are simultaneously switched on and switched off.
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 |
|---|---|
| CN108012385A CN108012385A (en) | 2018-05-08 |
| CN108012385B true CN108012385B (en) | 2019-12-31 |
Family
ID=62050791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810046658.4A Expired - Fee Related CN108012385B (en) | 2018-01-18 | 2018-01-18 | Non-isolated multi-path current-sharing full-bridge LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108012385B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707838B (en) * | 2009-12-04 | 2012-11-21 | 英飞特电子（杭州）股份有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| CN102158096B (en) * | 2011-05-11 | 2013-11-20 | 南京博兰得电子科技有限公司 | Non-isolated resonant converter |
| TWI437408B (en) * | 2012-05-16 | 2014-05-11 | Univ Nat Cheng Kung | Current balancing led driver circuit and method thereof |
| CN103118460B (en) * | 2013-01-30 | 2014-12-03 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| CN105744671B (en) * | 2016-02-23 | 2017-12-08 | 福州大学 | A kind of passive LED drive power flowed of non-isolated multichannel |
| CN106793290B (en) * | 2016-12-20 | 2018-08-17 | 福州大学 | A kind of isolated multipath flows LED drive power |
-
2018
- 2018-01-18 CN CN201810046658.4A patent/CN108012385B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN108012385A (en) | 2018-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI404452B (en) | Current supply circuit and current control circuit for led | |
| CN105744671B (en) | A kind of passive LED drive power flowed of non-isolated multichannel | |
| CN103503572B (en) | Constant current driver circuit for LED | |
| CN103929852A (en) | LED lamp with light and color capable of being adjusted | |
| CN102137524B (en) | High-efficiency control method for balance-driving light-emitting diode (LED) | |
| CN202127536U (en) | Constant current circuit of light-emitting diode driving device | |
| CN106332406B (en) | LED drive circuit of multichannel independent control | |
| CN102665324A (en) | LED linear driving circuit applicable to thyristor dimmer and control method | |
| GB2526169A (en) | Circuit with LED (Light-Emitting Diode) dimming linear compensation | |
| CN201550315U (en) | LED driving circuit | |
| CN108012385B (en) | Non-isolated multi-path current-sharing full-bridge LED drive circuit | |
| CN105530728A (en) | Bus-current synchronous time-sharing multiplexing multi-channel constant current output LED driver topology and control method therefor | |
| CN105530724A (en) | SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing | |
| CN204859623U (en) | LED multichannel current -sharing control circuit | |
| CN108055736B (en) | Non-isolated full-bridge LED constant current driving power supply | |
| CN103200729B (en) | Light emitting diode (LED) luminous device directly driven in constant current by alternating current | |
| CN103313489A (en) | Combined linear constant current source and LED (light-emitting diode) driving circuit | |
| CN108307558B (en) | full-bridge LED constant current driving power supply with multi-path current-sharing output | |
| CN202261061U (en) | Constant current output flyback converter | |
| CN205071401U (en) | A LED constant -current drive apparatus | |
| CN207354677U (en) | Led drive circuit | |
| CN201919223U (en) | High-power LED lamp | |
| CN108235516B (en) | LED drive circuit with constant current and current sharing characteristics | |
| CN118283873B (en) | LED driving circuit, driving method and LED lighting lamp thereof | |
| CN104582159B (en) | A kind of LED light emission device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191231 Termination date: 20220118 |