CN206097870U - LED backlight driving circuit - Google Patents
LED backlight driving circuit Download PDFInfo
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- CN206097870U CN206097870U CN201621047311.4U CN201621047311U CN206097870U CN 206097870 U CN206097870 U CN 206097870U CN 201621047311 U CN201621047311 U CN 201621047311U CN 206097870 U CN206097870 U CN 206097870U
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- 238000004804 winding Methods 0.000 claims abstract description 59
- 230000008878 coupling Effects 0.000 claims abstract description 18
- 238000010168 coupling process Methods 0.000 claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000001131 transforming effect Effects 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 description 11
- 230000005611 electricity Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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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 utility model discloses a LED drive circuit that is shaded, include: 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
This utility model is related 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, LED gradually starts to become important backlight in giant-screen application.It is enough bright in order to obtain
Degree, needs to use in many LED strip connection in backlight application.However, for certain power conversion or safety etc. actually ask
The consideration of topic, the number of LED generally has certain restriction in often going here and there, therefore in actual large-scale LCD backlight application, LED
Generally LED strip is first composed in series, then each LED strip is together in parallel again composition LED array.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 littles may result in and flow through the electric current of LED and change a lot.Therefore, it is constant in order to produce
Brightness, it is necessary to each string LED in LED-backlit power supply carries out current constant control.
In typical LED-backlit power supply architecture, LED drive circuit is devised for driving LED strip, and each string LED is entered
Row sharing control is producing identical brightness.
Wherein, done using inductance at present in the scheme of LED flow equalizing circuits, also without effective two-way backlight differential pressure security
Scheme, especially when two-way backlight voltage difference is excessive, causes to shield brightness irregularities, and has the risk for damaging LED lamp bar.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of LED backlight drive circuit, and by inductance LED is being
In the scheme for flowing, when two-way backlight circuit pressure reduction is excessive, effective circuit protection can be realized, so as to avoid LED from damaging
Risk.
To solve the above problems, this utility model 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 electric current for driving LED load circuit；
Flow equalizing circuit, between the outfan of the current suppling circuit and the input of the LED load circuit；Institute
Flow equalizing circuit is stated including at least one coupling inductance, 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 assists winding in the coupling inductance and with the assists winding two ends
The on-off circuit for connecing, the outfan of the on-off circuit is used as the Enable Pin for controlling the LED backlight drive circuit.
Compared with prior art, a kind of LED backlight drive circuit that this utility model is provided, using passing through in prior art
Inductance realizes on the basis of LED current share schemes the on-off circuit one set up assists winding on inductance and be connected with assists winding
Rise and constitute pressure reduction circuit for detecting；It is auxiliary by electromagnetic coupled principle when having pressure drop on the first main winding or the second main winding
Helping on winding can also produce voltage, the control source on-off circuit of generation；When the voltage of the input switching circuit is excessive, switch
Circuit closes the level signal of circuit to the LED backlight drive circuit output, so as to realize effective circuit protection；And then avoid
The risk that the LED lamp bar caused because pressure reduction is excessive is damaged.
Further, the coupling inductance includes the first main winding and the second main winding；Wherein, first main winding
The input of input and second main winding is connected with the outfan of the current suppling circuit；First main winding
Outfan be connected with the input of first group of LED load；The outfan of second main winding and second group of LED
The input connection of load；The input of the input of first main winding and second main winding different name end each other.
Preferably, the on-off circuit includes rectifier bridge, filter capacitor, first resistor, second resistance and audion；
Two ac input ends of the rectifier bridge are the input of the on-off circuit, and two of the rectifier bridge exchange
Input is connected respectively with the two ends of the assists winding, and the positive pole of the DC output end of the rectifier bridge connects respectively the filter
One end of ripple electric capacity and one end of the first resistor, the minus earth of the DC output end of the rectifier bridge；
The other end ground connection of the filter capacitor；
The other end of the first resistor connects respectively the base stage of one end of the second resistance and the audion；
The other end of the second resistance connect respectively and the audion emitter stage；
The outfan of the extremely described on-off circuit of the current collection of the audion.
Preferably, this utility model is employed by rectifier bridge, filter capacitor, first resistor, second resistance and audion
The on-off circuit of composition, when the ac voltage signal of assists winding is after rectifier bridge rectification, filtered capacitor filtering is into 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 through first resistor and
After the partial pressure of second resistance, then the switch of audion is controlled, when the voltage of filter capacitor exceedes preset voltage protection threshold value, three
The colelctor electrode output of pole pipe makes the level signal that LED backlight drive circuit is closed；The voltage protection threshold value by R1 and R2 resistance
Ratio determine.The on-off circuit is by judging whether pressure difference that assists winding is detected exceedes voltage protection threshold value controlling
The break-make of LED backlight drive circuit processed, so as to realize the effective guarantor when two-way backlight LED load circuit pressure reduction is excessive to circuit
Shield.
Further, the current suppling circuit includes transforming circuit and rectification circuit；The input of the transforming circuit
For receiving source current；The outfan of the transforming circuit is connected with the input of the rectification circuit, the rectification circuit
Outfan be connected with the input of the flow equalizing circuit.
Further, the 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 first group of LED load, second filter circuit and second group of LED load
Input connects.
Further, first filter circuit includes the first electrochemical capacitor, the positive pole of first electrochemical capacitor and institute
State the input connection of first group of LED load, the minus earth of first electrochemical capacitor.
Further, second filter circuit includes the second electrochemical capacitor, the positive pole of second electrochemical capacitor and institute
State the input connection of second group of LED load, the minus earth of second electrochemical capacitor.
Further, the rectification circuit includes commutation diode, and the input of the commutation diode connects the change
Volt circuit, the outfan of the commutation diode connects the input of the flow equalizing circuit.
Further, the power circuit includes transformator, and the two ends of the primary coil of the transformator are used to receive electricity
Ource electric current, one end of the secondary coil of the transformator is connected with the input of the rectification circuit, the secondary of the transformator
The other end ground connection of coil.
Further, first group of LED load and second group of LED load include being associated in one by some LED strips
The LED strip for rising.
Description of the drawings
Fig. 1 is a kind of circuit structure diagram of an embodiment of LED backlight drive circuit of this utility model；
Fig. 2 is a kind of circuit module figure of an embodiment of LED backlight drive circuit of this utility model.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
This utility model 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, the LED backlight drive circuit includes LED load circuit 1, flows
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 outfan 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
The input LED Out2+ of second group of LED load 102 of end connection；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 connects with assists winding N3 two ends
The on-off circuit 31 for 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 as on-off circuit 31 input, two of rectifier bridge BD1
Ac input end connection corresponding with the two ends of assists winding N3；The positive pole of the DC output end of rectifier bridge BD1 connects respectively filtering
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 respectively the base stage of one end of second resistance R2 and audion Q1；Second resistance
The other end of R2 connect respectively and audion Q1 emitter stage；The outfan of the current collection of audion Q1 extremely on-off circuit 31；
I.e. the colelctor electrode of audion Q1 as control the LED backlight drive circuit Enable Pin EN, or, the colelctor electrode of audion Q1 and company
Then the Enable Pin EN connection of the control chip of the LED backlight drive circuit.
Electric current is powered electricity 4, including transforming circuit 41 and rectification circuit 42.Transforming circuit 41 includes transformator T1；Rectified current
Road 42 includes commutation diode D1.
Wherein, the two ends of the primary coil of transformator T1 are used to receive source current；The one of the secondary coil of transformator T1
End is connected with the positive pole of commutation diode D1, the other end ground connection of the secondary coil of transformator 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.
The LED backlight drive circuit also includes the first filter circuit 111；First filter circuit 111 includes the first electrolysis electricity
Hold E1；The 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 strips.
When being embodied as, first by transformator T1 source current is received conversion and through commutation diode D1 rectifications be for
Drive the pulse current of LED load circuit 1；Then, the 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 the stream of the electric current of input two paths of LED load；The two-way electric current that realization is flowed is respectively through the first electrolysis electricity
Hold the correspondence first group of LED load circuit of 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 there is pressure drop on main winding N1 or the second main winding N2, by electromagnetic coupled principle, alternating current is produced in assists winding N3
Pressure signal is simultaneously input to on-off circuit 31；When the ac voltage signal for producing is excessive, realize carrying on the back LED by on-off circuit 31
The closing of light drive circuit, so as to 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 is filtered the ac voltage signal produced in assists winding N3
Into direct current signal, the voltage at filter capacitor C1 two ends is the voltage between the first electrochemical capacitor E1 and the second electrochemical capacitor E2 to ripple
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 audion
The switch of Q1.V0The voltage threshold protected by pressure reduction circuit for detecting；VTFor the unlatching between the base stage and emitter stage of audion Q1
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 audion Q1
Change, the now colelctor electrode realization as control LED backlight drive circuit Enable Pin is closed to LED backlight drive circuit, is played
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 the 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 indirect control LED backlight drive circuit of on-off circuit 31 being connected with assists winding N3
Close, it is to avoid the risk that the LED lamp bar caused 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, on-off circuit, supply current circuit and the filter of other forms is replaced
The circuit structure of wave circuit, and/or the flow equalizing circuit that the utilization inductance realization of other forms is flowed is replaced, drive in LED-backlit
Pressure reduction of the circuit appearance at least between two paths of LED load can realize the specific embodiment to efficient circuit protection when excessive
Within protection domain of the present utility model.
The above is preferred implementation of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of without departing from this utility model principle, some improvement and deformation can also be made, these improve and become
Shape is also considered as protection domain of the present utility model.
Claims (10)
1. a kind of LED backlight drive circuit, it is characterised in that include
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 electric current for driving LED load circuit；
Flow equalizing circuit, between the outfan of the current suppling circuit and the input of the LED load circuit；It is described equal
Current circuit includes at least one coupling inductance, and the coupling inductance is born to balance first group of LED load and second group of LED
The size of current of load；
Pressure differential detection circuit, is connected including the assists winding in the coupling inductance and with the assists winding two ends
On-off circuit, the outfan of the on-off circuit is used as the Enable Pin for controlling the LED backlight drive circuit.
2. a kind of LED backlight drive circuit as claimed in claim 1, it is characterised in that the coupling inductance includes that first leads
Winding and the second main winding；Wherein, the input of the input of first main winding and second main winding with it is described
The outfan connection of current suppling circuit；The outfan of first main winding connects with the input of first group of LED load
Connect；The outfan of second main winding is connected with the input of second group of LED load；The input of first main winding
End and the input different name end each other of second main winding.
3. a kind of LED backlight drive circuit as claimed in claim 1, it is characterised in that the on-off circuit include rectifier bridge,
Filter capacitor, first resistor, second resistance and audion；
Two ac input ends of the rectifier bridge are the input of the on-off circuit, and two exchanges of the rectifier bridge are input into
End is connected respectively with the two ends of the assists winding, and the positive pole of the DC output end of the rectifier bridge connects respectively the filtered electrical
One end of appearance and one end of the first resistor, the minus earth of the DC output end of the rectifier bridge；
The other end ground connection of the filter capacitor；
The other end of the first resistor connects respectively the base stage of one end of the second resistance and the audion；
The other end of the second resistance connect respectively and the audion emitter stage；
The outfan of the extremely described on-off circuit of the current collection of the audion.
4. a kind of LED backlight drive circuit as claimed in claim 1, it is characterised in that the current suppling circuit includes becoming
Volt circuit and rectification circuit；The input of the transforming circuit is used to receive source current；The outfan of the transforming circuit with
The input connection of the rectification circuit, the outfan of the rectification circuit is connected with the input of the flow equalizing circuit.
5. a kind of LED backlight drive circuit as claimed in claim 1, it is characterised in that the LED backlight drive circuit is also wrapped
Include the first filter circuit and the second filter circuit；First filter circuit is connected with the input of first group of LED load,
Second filter circuit is connected with the input of second group of LED load.
6. a kind of LED backlight drive circuit as claimed in claim 5, it is characterised in that first filter circuit includes the
One electrochemical capacitor, the positive pole of first electrochemical capacitor is connected with the input of first group of LED load, first electrolysis
The minus earth of electric capacity.
7. a kind of LED backlight drive circuit as claimed in claim 5, it is characterised in that second filter circuit includes the
Two electrochemical capacitors, the positive pole of second electrochemical capacitor is connected with the input of second group of LED load, second electrolysis
The minus earth of electric capacity.
8. a kind of LED backlight drive circuit as claimed in claim 4, it is characterised in that the rectification circuit includes rectification two
Pole pipe, the input of the commutation diode connects the transforming circuit, and the outfan connection of the commutation diode is described
The input of current circuit.
9. a kind of LED backlight drive circuit as claimed in claim 4, it is characterised in that the transforming circuit includes transformator,
The two ends of the primary coil of the transformator are used to receive source current, and one end of the secondary coil of the transformator is whole with described
The input connection of current circuit, the other end ground connection of the secondary coil of the transformator.
10. a kind of LED backlight drive circuit as claimed in claim 1, it is characterised in that first group of LED load and institute
State the LED strip that second group of LED load includes being linked togather by some LED strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621047311.4U CN206097870U (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621047311.4U CN206097870U (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206097870U true CN206097870U (en) | 2017-04-12 |
Family
ID=58475069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621047311.4U Active CN206097870U (en) | 2016-09-09 | 2016-09-09 | LED backlight driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206097870U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409239A (en) * | 2016-09-09 | 2017-02-15 | 广州视源电子科技股份有限公司 | LED backlight driving circuit |
| CN107105543A (en) * | 2017-05-03 | 2017-08-29 | 四川大学 | A kind of backlight LED drive circuit |
-
2016
- 2016-09-09 CN CN201621047311.4U patent/CN206097870U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409239A (en) * | 2016-09-09 | 2017-02-15 | 广州视源电子科技股份有限公司 | LED backlight driving circuit |
| CN106409239B (en) * | 2016-09-09 | 2019-11-26 | 广州视源电子科技股份有限公司 | LED backlight driving circuit |
| CN107105543A (en) * | 2017-05-03 | 2017-08-29 | 四川大学 | A kind of backlight LED drive circuit |
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