CN106409239A - LED backlight drive circuit - Google Patents
LED backlight drive circuit Download PDFInfo
- Publication number
- CN106409239A CN106409239A CN201610814352.XA CN201610814352A CN106409239A CN 106409239 A CN106409239 A CN 106409239A CN 201610814352 A CN201610814352 A CN 201610814352A CN 106409239 A CN106409239 A CN 106409239A
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- China
- Prior art keywords
- circuit
- led
- input
- current
- backlight drive
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- 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.)
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Classifications
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- 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]
Abstract
The invention discloses an LED backlight drive circuit which comprises an LED load circuit including a first set of LED loads and a second set of LED loads, a current power supply circuit for receiving current of a power supply and converts into the current for driving the LED load circuit, a current sharing circuit which is arranged between the output terminal of the current power supply circuit and the input terminal of the LED load circuit and comprises at least one coupling inductor for balancing the current between the first set of LED loads and the second set of LED loads, and a voltage difference detection circuit which comprises an auxiliary winding arranged on the coupling inductor and a switch circuit connected to the two ends of the auxiliary winding. The output terminal of the switch circuit serves as an enabling end for controlling the LED backlight drive circuit. The LED backlight drive circuit realizes effective circuit protection when voltage difference of two paths of LED loads is excessively great, prevents damage of an LED lamp and further protects screen equipment.
Description
Technical field
The present invention relates to illumination circuit field, more particularly, to a kind of LED backlight drive circuit.
Background technology
With the development of light emitting diode, because it has, luminous efficiency height, fast response time, color reducibility be good, the longevity
The advantages of life length and mercury-free, in giant-screen application, LED gradually starts to become important backlight.Enough bright in order to obtain
Degree, needs to use a lot of LED strip connection in backlight application.However, asking for actual to certain power conversion or safety etc.
The consideration of topic, in often going here and there, the number of LED generally has certain restriction, therefore in actual large-scale LCD backlight is applied, LED
Generally first it is composed in series LED strip, then each LED strip is together in parallel composition LED array again.In order that whole screen intensity is consistent,
Each LED strip must provide for identical luminosity.From the characteristic of LED, the luminosity of LED is proportional to its driving current,
And the fluctuation of LED both end voltage very little may result in and flows through the electric current of LED and change a lot.Therefore, constant in order to produce
Brightness it is necessary to current constant control is carried out to each string LED in LED-backlit power supply.
In typical LED-backlit power supply architecture, devise LED drive circuit for driving LED strip, and each string LED is entered
Row sharing control is to produce identical brightness.
Wherein, in the scheme doing LED flow equalizing circuit using inductance at present, also there is no effective two-way backlight differential pressure security
Scheme, especially when two-way backlight voltage difference is excessive, leads to shield brightness irregularities, and the risk of the LED lamp bar that is damaged.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of LED backlight drive circuit, all flows being LED by inductance
Scheme in, when two-way backlight circuit pressure reduction is excessive, enable effective circuit protection, thus avoid LED damage wind
Danger.
For solving 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, in order to receive source current and to be converted to the electric current for driving LED load circuit；
Flow equalizing circuit, located between the output end of described current suppling circuit and the input of described LED load circuit；Institute
State flow equalizing circuit and include at least one coupling inductance, described coupling inductance is in order to balance described first group of LED load and second group
The size of current of LED load；
Pressure differential detection circuit, including the assists winding in described coupling inductance and with described assists winding two ends even
The on-off circuit connecing, the output end of described on-off circuit is as the Enable Pin controlling described LED backlight drive circuit.
Compared with prior art, the present invention provide a kind of LED backlight drive circuit, using in prior art pass through inductance
Structure together with assists winding and the on-off circuit that is connected with assists winding are set up on the basis of realizing LED current share scheme on inductance
Become pressure reduction circuit for detecting；When having pressure drop on the first main winding or the second main winding, by electromagnetic coupled principle, auxiliary around
Voltage, the control source on-off circuit of generation also can be produced on group；When the voltage of this input switching circuit is excessive, on-off circuit
The level signal closing closed circuit is exported to this LED backlight drive circuit, thus realizing effective circuit protection；And then avoid due to
The risk that the excessive LED lamp bar causing of pressure reduction is damaged.
Further, described coupling inductance includes the first main winding and the second main winding；Wherein, described first main winding
The input of input and described second main winding is all connected with the output end of described current suppling circuit；Described first main winding
Output end be connected with the input of described first group of LED load；The output end of described second main winding and described second group of LED
The input of load connects；The input different name end each other of the input of described first main winding and described second main winding.
Preferably, described on-off circuit includes rectifier bridge, filter capacitor, first resistor, second resistance and triode；
Two ac input ends of described rectifier bridge are the input of described on-off circuit, two exchanges of described rectifier bridge
Input is connected with the two ends of described assists winding respectively, and the positive pole of the DC output end of described rectifier bridge connects described filter respectively
One end of ripple electric capacity and one end of described first resistor, the minus earth of the DC output end of described rectifier bridge；
The other end ground connection of described filter capacitor；
The other end of described first resistor connects one end of described second resistance and the base stage of described triode respectively；
The other end of described second resistance connect respectively and described triode emitter stage；
The output end of the extremely described on-off circuit of the current collection of described triode.
Preferably, present invention employs being made up of rectifier bridge, filter capacitor, first resistor, second resistance and triode
On-off circuit, when the ac voltage signal of assists winding is after rectifier bridge rectification, filtered capacitor filtering becomes direct current signal,
The voltage of both ends of filter capacitor is the voltage difference of two paths of LED load；The voltage of filter capacitor is through first resistor and second
After the partial pressure of resistance, then control the switch of triode, when the voltage of filter capacitor exceedes preset voltage protection threshold value, triode
Colelctor electrode output make LED backlight drive circuit close level signal；This voltage protection threshold value by R1 and R2 resistance ratio
Value determines.This on-off circuit is controlled by judging whether the pressure difference that assists winding is detected exceedes voltage protection threshold value
The break-make of LED backlight drive circuit, thus realize effective guarantor to circuit when two-way backlight LED load circuit pressure reduction is excessive
Shield.
Further, described current suppling circuit includes transforming circuit and rectification circuit；The input of described transforming circuit
For receiving source current；The output end of described transforming circuit is connected with the input of described rectification circuit, described rectification circuit
Output end be connected with the input of described flow equalizing circuit.
Further, described LED backlight drive circuit also includes the first filter circuit and the second filter circuit；Described first
Filter circuit is connected with the input of described first group of LED load, described second filter circuit and described second group of LED load
Input connects.
Further, described first filter circuit includes the first electrochemical capacitor, the positive pole of described first electrochemical capacitor and institute
The input stating first group of LED load connects, the minus earth of described first electrochemical capacitor.
Further, described second filter circuit includes the second electrochemical capacitor, the positive pole of described second electrochemical capacitor and institute
The input stating second group of LED load connects, the minus earth of described second electrochemical capacitor.
Further, described rectification circuit includes commutation diode, and the input of described commutation diode connects described change
Volt circuit, the output end of described commutation diode connects the input of described flow equalizing circuit.
Further, described power circuit includes transformer, and the two ends of the primary coil of described transformer are used for receiving electricity
Ource electric current, one end of the secondary coil of described transformer is connected with the input of described rectification circuit, the secondary of described transformer
The other end ground connection of coil.
Further, described first group of LED load and described second group of LED load all include being associated in one by some LED strip
The LED strip rising.
Brief description
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
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the 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, this LED backlight drive circuit includes LED load circuit 1, flow equalizing circuit
2nd, 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 the first main winding N1 connects the input LED Out1+ of first group of LED load 101；The output of the second main winding N2
End connects the input LED Out2+ of second group of LED load 102；The input of the first main winding N1 and the second main winding N2's
Input different name end each other.
Pressure differential detection circuit 3, including assists winding N3 in coupling inductance L1, and with assists winding N3 two ends even
The on-off circuit 31 connecing；On-off circuit 31 includes rectifier bridge BD1, filter capacitor C1, first resistor R1, second resistance R2 and three poles
Pipe Q1.
Wherein, two ac input ends of rectifier bridge BD1 are as the input of on-off circuit 31, two of rectifier bridge BD1
Ac input end is corresponding with the two ends of assists winding N3 to be connected；The positive pole of the DC output end of rectifier bridge BD1 connects filtering respectively
One end of electric capacity C1 and one end of first resistor R1, the minus earth of the DC output end of rectifier bridge BD1.Filter capacitor C1's is another
One end is grounded；The other end of first resistor R1 connects one end of second resistance R2 and the base stage of triode Q1 respectively；Second resistance
The other end of R2 connect respectively and triode Q1 emitter stage；The output end of the current collection of triode Q1 extremely on-off circuit 31；
I.e. the colelctor electrode of triode Q1 is as Enable Pin EN controlling this LED backlight drive circuit, or, the colelctor electrode of triode Q1 and company
Then Enable Pin EN of the control chip of this LED backlight drive circuit connects.
Electric current power electricity 4, including transforming circuit 41 and rectification circuit 42.Transforming circuit 41 includes transformer T1；Rectified current
Road 42 includes commutation diode D1.
Wherein, the two ends of the primary coil of transformer T1 are used for receiving source current；The one of the secondary coil of transformer T1
End is connected with the positive pole of commutation diode D1, the other end ground connection of the secondary coil of transformer T1；The negative pole of commutation diode D1
Connect the input of the first main winding N1 and the input of the second main winding N2 respectively.
This LED backlight drive circuit also includes the first filter circuit 111；First filter circuit 111 includes the first electrolysis electricity
Hold E1；This LED backlight drive circuit also includes the second filter circuit 112；Second filter circuit 112 includes the second electrochemical capacitor
E2.Wherein, the positive pole of the first electrochemical capacitor E1 is connected with the input LED Out1+ of first group of LED load 101, the first electrolysis
The minus earth of electric capacity E1；The positive pole of the second electrochemical capacitor E2 is connected with the input LED Out2+ of second group of LED load 102,
The minus earth of the second electrochemical capacitor E2.
First group of LED load 101 and second group of LED load 102 are including the LED strip being linked togather by some LED strip.
When being embodied as, first by transformer T1 source current is received conversion and through commutation diode D1 rectification be for
Drive the pulse current of LED load circuit 1；Then, this pulse current is divided into that two-way electric current respectively flows through coupling inductance L1
One main winding N1 and the second main winding N2, by the first main winding N1's and the second main winding N2 located at same coupling inductance L1
Current balance function realizes all stream of the electric current of input two paths of LED load；The two-way electric current realizing all stream is respectively through the first electrolysis electricity
Hold the first group of LED load circuit of corresponding input after the filter action of E1 and the second electrochemical capacitor E2 and second group of LED load electricity
Road.
When being embodied as, assists winding N3 is used for the pressure reduction of detecting the first main winding N1 and the second main winding N2：When first
When pressure drop occurring on main winding N1 or the second main winding N2, by electromagnetic coupled principle, assists winding N3 produces alternating current
Pressure signal is simultaneously input to on-off circuit 31；When the ac voltage signal producing is excessive, realize LED is carried on the back by on-off circuit 31
The closing of light drive circuit, thus avoid because of the excessive damage to LED load of pressure reduction.The specific work process of on-off circuit 31 is such as
Under：
After the rectification of rectifier bridge BD1, first filtered electric capacity C1 filters the ac voltage signal producing in assists winding N3
Ripple becomes direct current signal, and the voltage at filter capacitor C1 two ends is the voltage between the first electrochemical capacitor E1 and the second electrochemical capacitor E2
Difference；Then, the voltage at filter capacitor C1 two ends 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 reduction circuit for detecting；VTUnlatching between base stage for triode Q1 and emitter stage
The ratio of voltage, first resistor R1 and second resistance R2 determines protection voltage threshold V0, calculate especially by following formula：
When the voltage at filter capacitor C1 two ends exceedes protection voltage threshold, the colelctor electrode outputs level signals of triode Q1
Change, now realizes LED backlight drive circuit is closed as the colelctor electrode controlling LED backlight drive circuit Enable Pin, plays
The effect of protection circuit.
The present embodiment is realizing two paths of LED load electricity by the first main winding N1 and the second main winding N2 of coupling inductance L1
On the basis of all stream on road, the first main winding N1 and the second main winding are detected by assists winding N3 in coupling inductance L1
The pressure reduction of N2, when pressure reduction is excessive, by the on-off circuit 31 indirect control LED backlight drive circuit being connected with assists winding N3
Close, it is to avoid the risk that the LED lamp bar causing because pressure reduction is excessive is damaged, and then realize the protection to screen equipment.
On the basis of without departing from the present embodiment principle, replace on-off circuit, supply current circuit and the filter of other forms
The circuit structure of wave circuit, and/or replace the flow equalizing circuit of utilization inductance realization all stream of other forms, drive in LED-backlit
Pressure reduction between circuit appearance at least two paths of LED load is capable of the specific embodiment to efficient circuit protection when excessive
Within protection scope of the present invention.
The above is the preferred embodiment of the present invention it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvement can also be made and deform, these improve and deformation is also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of LED backlight drive circuit is it is characterised in that include
LED load circuit, including first group of LED load and second group of LED load；
Current suppling circuit, in order to receive source current and to be converted to the electric current for driving LED load circuit；
Flow equalizing circuit, located between the output end of described current suppling circuit and the input of described LED load circuit；Described equal
Current circuit includes at least one coupling inductance, and described coupling inductance is born in order to balance described first group of LED load and second group of LED
The size of current carrying；
Pressure differential detection circuit, be connected including the assists winding in described coupling inductance and with described assists winding two ends
On-off circuit, the output end of described on-off circuit is as the Enable Pin controlling described LED backlight drive circuit.
2. as claimed in claim 1 a kind of LED backlight drive circuit it is characterised in that described coupling inductance to include first main
Winding and the second main winding；Wherein, the input of the input of described first main winding and described second main winding all with described
The output end of current suppling circuit connects；The output end of described first main winding is connected with the input of described first group of LED load
Connect；The output end of described second main winding is connected with the input of described second group of LED load；The input of described first main winding
End and the input different name end each other of described second main winding.
3. as claimed in claim 1 a kind of LED backlight drive circuit it is characterised in that described on-off circuit include rectifier bridge,
Filter capacitor, first resistor, second resistance and triode；
Two ac input ends of described rectifier bridge are the input of described on-off circuit, two exchange inputs of described rectifier bridge
End is connected with the two ends of described assists winding respectively, and the positive pole of the DC output end of described rectifier bridge connects described filtered electrical respectively
The one end holding and one end of described first resistor, the minus earth of the DC output end of described rectifier bridge；
The other end ground connection of described filter capacitor；
The other end of described first resistor connects one end of described second resistance and the base stage of described triode respectively；
The other end of described second resistance connect respectively and described triode emitter stage；
The output end of the extremely described on-off circuit of the current collection of described triode.
4. as claimed in claim 1 a kind of LED backlight drive circuit it is characterised in that described current suppling circuit include become
Volt circuit and rectification circuit；The input of described transforming circuit is used for receiving source current；The output end of described transforming circuit with
The input of described rectification circuit connects, and the output end of described rectification circuit is connected with the input of described flow equalizing circuit.
5. as claimed in claim 1 a kind of LED backlight drive circuit it is characterised in that described LED backlight drive circuit is also wrapped
Include the first filter circuit and the second filter circuit；Described first filter circuit is connected with the input of described first group of LED load,
Described second filter circuit is connected with the input of described second group of LED load.
6. as claimed in claim 5 a kind of LED backlight drive circuit it is characterised in that described first filter circuit includes
One electrochemical capacitor, the positive pole of described first electrochemical capacitor is connected with the input of described first group of LED load, described first electrolysis
The minus earth of electric capacity.
7. as claimed in claim 5 a kind of LED backlight drive circuit it is characterised in that described second filter circuit includes
Two electrochemical capacitors, the positive pole of described second electrochemical capacitor is connected with the input of described second group of LED load, described second electrolysis
The minus earth of electric capacity.
8. as claimed in claim 4 a kind of LED backlight drive circuit it is characterised in that described rectification circuit includes rectification two
Pole pipe, the input of described commutation diode connects described transforming circuit, and the output end connection of described commutation diode is described all
The input of current circuit.
9. as claimed in claim 4 a kind of LED backlight drive circuit it is characterised in that described transforming circuit includes transformer,
The two ends of the primary coil of described transformer are used for receiving source current, and one end of the secondary coil of described transformer is whole with described
The input of current circuit connects, the other end ground connection of the secondary coil of described transformer.
10. as claimed in claim 1 a kind of LED backlight drive circuit it is characterised in that described first group of LED load and institute
State the LED strip that second group of LED load all includes being linked togather by some LED strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814352.XA CN106409239B (en) | 2016-09-09 | 2016-09-09 | A kind of LED backlight drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814352.XA CN106409239B (en) | 2016-09-09 | 2016-09-09 | A kind of LED backlight drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106409239A true CN106409239A (en) | 2017-02-15 |
| CN106409239B CN106409239B (en) | 2019-11-26 |
Family
ID=57999261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610814352.XA Active CN106409239B (en) | 2016-09-09 | 2016-09-09 | A kind of LED backlight drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106409239B (en) |
Cited By (1)
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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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106409239B (en) | 2019-11-26 |
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