CN106409239B - LED backlight driving circuit - Google Patents
LED backlight driving circuit Download PDFInfo
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- CN106409239B CN106409239B CN201610814352.XA CN201610814352A CN106409239B CN 106409239 B CN106409239 B CN 106409239B CN 201610814352 A CN201610814352 A CN 201610814352A CN 106409239 B CN106409239 B CN 106409239B
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- 238000004804 winding Methods 0.000 claims abstract description 59
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 37
- 230000001131 transforming effect Effects 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 230000006378 damage Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000008832 photodamage Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses an LED backlight drive circuit, comprising: an LED load circuit comprising a first set of LED loads and a second set of LED loads; the current supply circuit is used for receiving power supply current and converting the power supply current into current for driving the LED load circuit; the current equalizing circuit is arranged between the output end of the current supply circuit and the input end of the LED load circuit; the current equalizing circuit comprises at least one coupling inductor, and the coupling inductor is used for balancing the current magnitude of the first group of LED loads and the second group of LED loads; and the voltage difference detection circuit comprises an auxiliary winding arranged on the coupling inductor and a switch circuit connected with two ends of the auxiliary winding, and the output end of the switch circuit is used as an enabling end for controlling the LED backlight driving circuit. The LED backlight driving circuit can realize effective circuit protection when the pressure difference of two paths of LED loads is overlarge so as to avoid the risk of damage of an LED lamp and further protect screen equipment.
Description
Technical field
The present invention relates to illumination circuit field more particularly to a kind of LED backlight drive circuits.
Background technique
With the development of light emitting diode, due to it with luminous efficiency height, fast response time, color reducibility be good, the longevity
The advantages that life length and mercury-free, LED gradually starts to become important backlight in large screen application.It is enough bright in order to obtain
Degree needs for many LED to be used in series in backlight application.However, actually being asked for certain power transformation or safety etc.
The considerations of topic, the number of LED usually has certain limitation in every string, therefore in the application of actual large-scale LCD backlight, LED
It is usually first composed in series LED string, then each LED string is together in parallel again forms LED array.In order to keep entire screen intensity consistent,
Each LED string must provide identical light emission luminance.By the characteristic of LED it is found that the light emission luminance of LED is proportional to its driving current,
And the electric current that the fluctuation of LED both end voltage very little will lead to flow through LED changes a lot.Therefore, constant in order to generate
Brightness, it is necessary to in LED backlight power supply each string LED carry out current constant control.
In typical LED backlight power supply architecture, devise LED drive circuit and be used to that LED is driven to go here and there, and to each string LED into
Row sharing control is to generate identical brightness.
Wherein, in the scheme for doing LED flow equalizing circuit using inductance at present, there are no effective two-way backlight differential pressure securities
Scheme causes to shield brightness irregularities, and have the risk of damage LED light bar especially when two-way backlight voltage difference is excessive.
Summary of the invention
The technical problem to be solved in the present invention is that providing a kind of LED backlight drive circuit, flowed being LED by inductance
Scheme in, when two-way backlight circuit pressure difference is excessive, be able to achieve effective circuit protection, thus avoid LED light damage wind
Danger.
To solve the above problems, the present invention provides a kind of LED backlight drive circuit, including
LED load circuit, including first group of LED load and second group of LED load；
Current suppling circuit, to receive source current and be converted to the electric current for driving LED load circuit；
Flow equalizing circuit, between the output end of the current suppling circuit and the input terminal of the LED load circuit；Institute
Stating flow equalizing circuit includes at least one coupling inductance, and the coupling inductance is to balance first group of LED load and second group
The size of current of LED load；
Pressure differential detection circuit connects including the auxiliary winding being set in the coupling inductance and with the auxiliary winding both ends
The switching circuit connect, the output end of the switching circuit is as the enable end for controlling the LED backlight drive circuit.
Compared with prior art, a kind of LED backlight drive circuit provided by the invention, using passing through inductance in the prior art
Auxiliary winding and the structure together with the switching circuit of auxiliary winding connection are added on the basis of realization LED current share scheme on inductance
At pressure difference circuit for detecting；When having pressure drop on the first main winding or the second main winding, by electromagnetic coupling principle, auxiliary around
Also voltage, the voltage input switching circuit of generation can be generated in group；When the voltage of the input switching circuit is excessive, switching circuit
The level signal for closing circuit is exported to the LED backlight drive circuit, to realize effective circuit protection；And then avoid due to
The risk of the damage of LED light bar caused by pressure difference is excessive.
Further, the coupling inductance includes the first main winding and the second main winding；Wherein, first main winding
The input terminal of input terminal and second main winding is connect with the output end of the current suppling circuit；First main winding
Output end connect with the input terminal of first group of LED load；The output end of second main winding and second group of LED
The input terminal of load connects；The input terminal of the input terminal of first main winding and second main winding different name end each other.
Preferably, the switching circuit includes rectifier bridge, filter capacitor, first resistor, second resistance and triode；
Two ac input ends of the rectifier bridge are the input terminal of the switching circuit, two exchanges of the rectifier bridge
Input terminal is connect with the both ends of the auxiliary winding respectively, and the anode of the DC output end of the rectifier bridge is separately connected the filter
One end of one end of wave capacitor and the first resistor, the cathode ground connection of the DC output end of the rectifier bridge；
The other end of the filter capacitor is grounded；
The other end of the first resistor is separately connected one end of the second resistance and the base stage of the triode；
The other end of the second resistance be separately connected and the triode emitter；
The output end of the extremely described switching circuit of the current collection of the triode.
Preferably, present invention employs be made of rectifier bridge, filter capacitor, first resistor, second resistance and triode
Switching circuit be filtered into direct current signal through filter capacitor when the ac voltage signal of auxiliary winding is after rectifier bridge rectifies,
The voltage of both ends of filter capacitor is the voltage difference of two paths of LED load；The voltage of filter capacitor passes through first resistor and second
After the partial pressure of resistance, then the switch of triode is controlled, when the voltage of filter capacitor is more than preset voltage protection threshold value, triode
Collector output make LED backlight drive circuit close level signal；The voltage protection threshold value by R1 and R2 resistance value ratio
Value determines.The switching circuit is controlled by judging whether pressure difference that auxiliary winding is detected is more than voltage protection threshold value
The on-off of LED backlight drive circuit, to realize when two-way backlight LED load circuit pressure difference is excessive to effective guarantor of circuit
Shield.
Further, the current suppling circuit includes transforming circuit and rectification circuit；The input terminal of the transforming circuit
For receiving source current；The output end of the transforming circuit is connect with the input terminal of the rectification circuit, the rectification circuit
Output end connect with the input terminal of the flow equalizing circuit.
Further, the LED backlight drive circuit further includes the first filter circuit and the second filter circuit；Described first
Filter circuit is connect with the input terminal of first group of LED load, second filter circuit and second group of LED load
Input terminal connection.
Further, first filter circuit includes the first electrolytic capacitor, the anode of first electrolytic capacitor and institute
State the input terminal connection of first group of LED load, the cathode ground connection of first electrolytic capacitor.
Further, second filter circuit includes the second electrolytic capacitor, the anode of second electrolytic capacitor and institute
State the input terminal connection of second group of LED load, the cathode ground connection of second electrolytic capacitor.
Further, the rectification circuit includes rectifier diode, and the input terminal of the rectifier diode connects the change
Volt circuit, the output end of the rectifier diode connect the input terminal of the flow equalizing circuit.
Further, the power circuit includes transformer, and the both ends of the primary coil of the transformer are for receiving electricity
Ource electric current, one end of the secondary coil of the transformer are connect with the input terminal of the rectification circuit, the secondary of the transformer
The other end of coil is grounded.
Further, first group of LED load and second group of LED load include being connected on one by several LED
The LED string risen.
Detailed description of the invention
Fig. 1 is a kind of circuit structure diagram of an embodiment of LED backlight drive circuit of the present invention；
Fig. 2 is a kind of circuit module figure of an embodiment of LED backlight drive circuit of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of embodiment of LED backlight drive circuit, and Fig. 1 is the circuit structure diagram of the present embodiment；Fig. 2 is
The circuit module figure of the present embodiment.Referring to Fig. 1 and Fig. 2, which includes LED load circuit 1, flow equalizing circuit
2, pressure differential detection circuit 3 and current suppling circuit 4.
Specifically,
LED load circuit 1 includes first group of LED load 101 and second group of LED load 102.
Flow equalizing circuit 2 includes coupling inductance L1, and coupling inductance L1 includes the first main winding N1, the second main winding N2；Wherein,
The output end of first main winding N1 connects the input terminal LED Out1+ of first group of LED load 101；The output of second main winding N2
The input terminal LED Out2+ of second group of LED load 102 of end connection；The input terminal of first main winding N1 and the second main winding N2's
Input terminal different name end each other.
Pressure differential detection circuit 3 connects including the auxiliary winding N3 being set on coupling inductance L1, and with the both ends auxiliary winding N3
The switching circuit 31 connect；Switching circuit 31 includes rectifier bridge BD1, filter capacitor C1, first resistor R1, second resistance R2 and three poles
Pipe Q1.
Wherein, input terminal of two ac input ends of rectifier bridge BD1 as switching circuit 31, two of rectifier bridge BD1
The both ends of ac input end and auxiliary winding N3 are correspondingly connected with；The anode of the DC output end of rectifier bridge BD1 is separately connected filtering
One end of capacitor C1 and one end of first resistor R1, the cathode ground connection of the DC output end of rectifier bridge BD1.Filter capacitor C1's is another
One end ground connection；The other end of first resistor R1 is separately connected one end of second resistance R2 and the base stage of triode Q1；Second resistance
The other end of R2 be separately connected and triode Q1 emitter；The output end of the current collection of triode Q1 extremely switching circuit 31；
I.e. the collector of triode Q1 is as the enable end EN for controlling the LED backlight drive circuit, or, the collector of triode Q1 and company
Then the enable end EN connection of the control chip of the LED backlight drive circuit.
Current suppling circuit 4, including transforming circuit 41 and rectification circuit 42.Transforming circuit 41 includes transformer T1；Rectification
Circuit 42 includes rectifier diode D1.
Wherein, the both ends of the primary coil of transformer T1 are for receiving source current；The one of the secondary coil of transformer T1
It holds and is connect with the anode of rectifier diode D1, the other end ground connection of the secondary coil of transformer T1；The cathode of rectifier diode D1
It is separately connected the input terminal of the first main winding N1 and the input terminal of the second main winding N2.
The LED backlight drive circuit further includes the first filter circuit 111；First filter circuit 111 includes the first electrolysis electricity
Hold E1；The LED backlight drive circuit further includes the second filter circuit 112；Second filter circuit 112 includes the second electrolytic capacitor
E2.Wherein, the anode of the first electrolytic capacitor E1 is connect with the input terminal LED Out1+ of first group of LED load 101, the first electrolysis
The cathode of capacitor E1 is grounded；The anode of second electrolytic capacitor E2 is connect with the input terminal LED Out2+ of second group of LED load 102,
The cathode of second electrolytic capacitor E2 is grounded.
First group of LED load 101 and second group of LED load 102 are the LED string including being cascaded by several LED.
It is used for when it is implemented, first receiving to convert and be rectified by rectifier diode D1 to source current by transformer T1
Drive the pulse current of LED load circuit 1；Then, which is divided into that two-way electric current respectively flows through coupling inductance L1
One main winding N1 and the second main winding N2 passes through the first main winding N1's and the second main winding N2 set on same coupling inductance L1
Current balance function realizes the stream of the electric current of input two paths of LED load；Realize that the two-way electric current flowed passes through the first electrolysis electricity respectively
First group of LED load circuit of corresponding input and second group of LED load electricity after holding the filter action of E1 and the second electrolytic capacitor E2
Road.
When it is implemented, auxiliary winding N3 is used to detect the pressure difference of the first main winding N1 and the second main winding N2: when first
When there is pressure drop on main winding N1 or the second main winding N2, by electromagnetic coupling principle, alternating current is generated on auxiliary winding N3
Pressure signal is simultaneously input to switching circuit 31；When the ac voltage signal of generation is excessive, is realized by switching circuit 31 and LED is carried on the back
The closing of light drive circuit, to avoid because of the excessive damage to LED load of pressure difference.The specific work process of switching circuit 31 is such as
Under:
The ac voltage signal generated on auxiliary winding N3 is first filtered through filter capacitor C1 after the rectification of rectifier bridge BD1
For wave at direct current signal, the voltage at the both ends filter capacitor C1 is the voltage between the first electrolytic capacitor E1 and the second electrolytic capacitor E2
Difference；Then, the voltage at the both ends filter capacitor C1 is after the partial pressure of first resistor R1 and second resistance R2, then controls triode
The switch of Q1.V0The voltage threshold protected by pressure difference circuit for detecting；VTFor the unlatching between the base stage and emitter of triode Q1
The ratio of voltage, first resistor R1 and second resistance R2 determine protection voltage threshold V0, it is calculated especially by following formula:
When the voltage at the both ends filter capacitor C1 is more than protection voltage threshold, the collector outputs level signals of triode Q1
Variation, the collector as control LED backlight drive circuit enable end, which is realized, at this time closes LED backlight drive circuit, plays
Protect the effect of circuit.
The present embodiment realizes two paths of LED load electricity in the first main winding N1 and the second main winding N2 by coupling inductance L1
On the basis of the stream on road, the first main winding N1 and the second main winding are detected by the auxiliary winding N3 being set on coupling inductance L1
The pressure difference of N2 indirectly controls LED backlight drive circuit by the switching circuit 31 connecting with auxiliary winding N3 when pressure difference is excessive
Close, avoid as pressure difference it is excessive caused by the risk damaged of LED light bar, and then realize protection to screen equipment.
On the basis of not departing from the present embodiment principle, the switching circuit, supply current circuit and filter of other forms are replaced
The circuit structure of wave circuit, and/or the flow equalizing circuit of replacement other forms flowed using inductance realization, are driven in LED backlight
Circuit occurs can be realized the specific embodiment to efficient circuit protection when the pressure difference between at least two paths of LED load is excessive
Within protection scope of the present invention.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principle of the present invention, several improvement and deformations can also be made, these improvement and deformations are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of LED backlight drive circuit, which is characterized in that including
LED load circuit, including first group of LED load and second group of LED load；
Current suppling circuit, to receive source current and be converted to the electric current for driving LED load circuit；
Flow equalizing circuit, between the output end of the current suppling circuit and the input terminal of the LED load circuit；It is described equal
Current circuit includes at least one coupling inductance, and the coupling inductance includes the first main winding for connecting first group of LED load,
The coupling inductance further includes the second main winding for connecting second group of LED load, to balance first group of LED load
With the size of current of second group of LED load；
Pressure differential detection circuit is connect including the auxiliary winding being set in the coupling inductance and with the auxiliary winding both ends
Switching circuit, the output end of the switching circuit is as the enable end for controlling the LED backlight drive circuit；Wherein, described to open
Powered-down road includes rectifier bridge, to access the AC signal of the auxiliary winding by the rectifier bridge.
2. a kind of LED backlight drive circuit as described in claim 1, which is characterized in that the input terminal of first main winding
It is connect with the output end of the current suppling circuit with the input terminal of second main winding；The output of first main winding
End is connect with the input terminal of first group of LED load；The output end of second main winding and second group of LED load
Input terminal connection；The input terminal of the input terminal of first main winding and second main winding different name end each other.
3. a kind of LED backlight drive circuit as described in claim 1, which is characterized in that the switching circuit include rectifier bridge,
Filter capacitor, first resistor, second resistance and triode；
Two ac input ends of the rectifier bridge are the input terminal of the switching circuit, two exchanges input of the rectifier bridge
End is connect with the both ends of the auxiliary winding respectively, and the anode of the DC output end of the rectifier bridge is separately connected the filtered electrical
One end of one end of appearance and the first resistor, the cathode ground connection of the DC output end of the rectifier bridge；
The other end of the filter capacitor is grounded；
The other end of the first resistor is separately connected one end of the second resistance and the base stage of the triode；
The other end of the second resistance be separately connected and the triode emitter；
The output end of the extremely described switching circuit of the current collection of the triode.
4. a kind of LED backlight drive circuit as described in claim 1, which is characterized in that the current suppling circuit includes becoming
Volt circuit and rectification circuit；The input terminal of the transforming circuit is for receiving source current；The output end of the transforming circuit with
The input terminal of the rectification circuit connects, and the output end of the rectification circuit is connect with the input terminal of the flow equalizing circuit.
5. a kind of LED backlight drive circuit as described in claim 1, which is characterized in that the LED backlight drive circuit is also wrapped
Include the first filter circuit and the second filter circuit；First filter circuit is connect with the input terminal of first group of LED load,
Second filter circuit is connect with the input terminal of second group of LED load.
6. a kind of LED backlight drive circuit as claimed in claim 5, which is characterized in that first filter circuit includes the
The anode of one electrolytic capacitor, first electrolytic capacitor is connect with the input terminal of first group of LED load, first electrolysis
The cathode of capacitor is grounded.
7. a kind of LED backlight drive circuit as claimed in claim 5, which is characterized in that second filter circuit includes the
The anode of two electrolytic capacitors, second electrolytic capacitor is connect with the input terminal of second group of LED load, second electrolysis
The cathode of capacitor is grounded.
8. a kind of LED backlight drive circuit as claimed in claim 4, which is characterized in that the rectification circuit includes rectification two
Pole pipe, the input terminal of the rectifier diode connect the transforming circuit, and the output end connection of the rectifier diode is described
The input terminal of current circuit.
9. a kind of LED backlight drive circuit as claimed in claim 4, which is characterized in that the transforming circuit includes transformer,
The both ends of the primary coil of the transformer for receiving source current, one end of the secondary coil of the transformer with it is described whole
The input terminal of current circuit connects, the other end ground connection of the secondary coil of the transformer.
10. a kind of LED backlight drive circuit as described in claim 1, which is characterized in that first group of LED load and institute
Stating second group of LED load includes the LED string being cascaded by several LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814352.XA CN106409239B (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814352.XA CN106409239B (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
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| Publication Number | Publication Date |
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| CN106409239A CN106409239A (en) | 2017-02-15 |
| CN106409239B true CN106409239B (en) | 2019-11-26 |
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| CN201610814352.XA Active CN106409239B (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107360648A (en) * | 2017-07-28 | 2017-11-17 | 株洲麦格米特电气有限责任公司 | A kind of two paths of LED of Buck topologys flows drive circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634839U (en) * | 2012-06-25 | 2012-12-26 | 深圳创维照明电器有限公司 | Light emitting diode (LED) drive circuit and LED lighting lamp |
| CN104952398A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | LED backlight drive circuit and LCD display |
| CN204887540U (en) * | 2015-06-25 | 2015-12-16 | 深圳麦格米特电气股份有限公司 | Two way current -sharing control circuit of LED |
| CN206097870U (en) * | 2016-09-09 | 2017-04-12 | 广州视源电子科技股份有限公司 | LED backlight driving circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049621A1 (en) * | 2010-03-04 | 2013-02-28 | O2Micro Inc. | Circuits and methods for driving light sources |
| CN202435643U (en) * | 2011-12-23 | 2012-09-12 | 东莞市亿凌电子有限公司 | Light emitting diode (LED) lamp |
| CN202679715U (en) * | 2012-05-09 | 2013-01-16 | 福建捷联电子有限公司 | High efficient LED light bar drive circuit |
| CN102752918B (en) * | 2012-06-15 | 2015-11-04 | 福建捷联电子有限公司 | A kind of LED drive circuit of half bridge architecture controlled by primary side |
| CN102932995B (en) * | 2012-11-06 | 2016-02-17 | 福建捷联电子有限公司 | The LED string drive circuit of low-cost high-efficiency |
| CN103345903B (en) * | 2013-07-15 | 2015-09-02 | 深圳市华星光电技术有限公司 | A kind of LED backlight system and display device |
| CN204287296U (en) * | 2014-08-04 | 2015-04-22 | Tcl海外电子（惠州）有限公司 | The forward voltage drop difference detecting circuit of LED module lamp bar and device |
| CN104267249A (en) * | 2014-10-09 | 2015-01-07 | 长智光电（四川）有限公司 | Device for measuring voltage difference between LED string lights |
-
2016
- 2016-09-09 CN CN201610814352.XA patent/CN106409239B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634839U (en) * | 2012-06-25 | 2012-12-26 | 深圳创维照明电器有限公司 | Light emitting diode (LED) drive circuit and LED lighting lamp |
| CN104952398A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | LED backlight drive circuit and LCD display |
| CN204887540U (en) * | 2015-06-25 | 2015-12-16 | 深圳麦格米特电气股份有限公司 | Two way current -sharing control circuit of LED |
| CN206097870U (en) * | 2016-09-09 | 2017-04-12 | 广州视源电子科技股份有限公司 | LED backlight driving circuit |
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| CN106409239A (en) | 2017-02-15 |
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