CN106251812A - A kind of backlight drive circuit and electronic equipment - Google Patents
A kind of backlight drive circuit and electronic equipment Download PDFInfo
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- CN106251812A CN106251812A CN201610676750.XA CN201610676750A CN106251812A CN 106251812 A CN106251812 A CN 106251812A CN 201610676750 A CN201610676750 A CN 201610676750A CN 106251812 A CN106251812 A CN 106251812A
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- switch
- inductance
- electric capacity
- drive circuit
- backlight drive
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of backlight drive circuit, including: power input；First inductance, its one end is connected with power input；Diode, its one end is connected with the other end of the first inductance；First electric capacity, is arranged in parallel the two ends at diode；Second electric capacity, its one end is connected with the other end of diode, and its other end passes through the second inductance ground connection；LED light array, is arranged in parallel the two ends at the second electric capacity；3rd inductance, its one end is connected with the other end of the first inductance, and its other end is by the first switch ground connection；3rd electric capacity, is arranged in parallel the two ends at the first switch；Wherein, buffer circuit ground connection is passed through in one end of the 3rd inductance, to be absorbed the voltage glitch of one end of the 3rd inductance by buffer circuit.Invention additionally discloses a kind of electronic equipment.By the way, the present invention can absorb the voltage glitch on switching node, effectively reduces the hunting of frequency of backlight drive circuit.
Description
Technical field
The present invention relates to electronic technology technical field, particularly relate to a kind of backlight drive circuit and electronic equipment.
Background technology
The backlight drive circuit used in current electronic device is booster circuit, and present backlight drive circuit easily produces
Raw switching noise, causes the voltage on switching node with certain hunting of frequency, thus produces radiation and electromagnetic interference electronics sets
The performance of standby antenna.As shown in Figure 1, electric capacity Cj1 and electric capacity Cj2 is respectively diode and the parasitic capacitance of metal-oxide-semiconductor T1, inductance
Lj1 is electronic equipment chip internal cabling stray inductance, and inductance Lj2 is that output capacitance Cout of booster circuit is parasitic to ground cabling
Inductance.When switch Guan Bi, i.e. during metal-oxide-semiconductor T1 conducting, electric capacity Cj1, electric capacity Cj2, inductance Lj1, inductance Lj2 and output capacitance
Closed-loop path can be formed between Cout, cause switching node (i.e. the other end of inductance L1) to produce voltage glitch, i.e. switching node
On voltage with certain hunting of frequency, thus produce the chip of radiation and electromagnetic interference electronic equipment, even have influence on electronics
The performance of the antenna of equipment.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of backlight drive circuit and electronic equipment, it is possible to absorb switch
Voltage glitch on node, effectively reduces the hunting of frequency of backlight drive circuit.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of backlight drive circuit, bag
Include: power input；First inductance, its one end is connected with power input；The other end of diode, its one end and the first inductance
Connect；First electric capacity, is arranged in parallel the two ends at diode；Second electric capacity, its one end is connected with the other end of diode, and it is another
The second inductance ground connection is passed through in one end；LED light array, is arranged in parallel the two ends at the second electric capacity；3rd inductance, its one end and first
The other end of inductance connects, and its other end is by the first switch ground connection；3rd electric capacity, is arranged in parallel the two ends at the first switch；
Wherein, the other end of the first inductance passes through buffer circuit ground connection, to be absorbed the electricity of the other end of the first inductance by buffer circuit
Dabbing stings.
Wherein, buffer circuit includes the 4th electric capacity and resistance, and one end of resistance is connected with the other end of the first inductance, resistance
The other end and the 4th electric capacity one end connect, the other end ground connection of the 4th electric capacity.
Wherein, buffer circuit also includes second switch, and one end of second switch is connected with the other end of the first inductance, second
The other end of switch is connected with one end of resistance.
Wherein, second switch is single knife switch.
Wherein, backlight drive circuit also includes that the 5th electric capacity, one end of the 5th electric capacity are connected with power input, the 5th electricity
The other end ground connection held.
Wherein, the first switch includes the another of the first end, the second end and the 3rd end, the first the first end switched and the 3rd inductance
One end connects, the second end ground connection of the first switch, and the 3rd end of the first switch is connected with controlling end, with by control end control the
The conducting of one switch.
Wherein, one end of the 3rd electric capacity is connected with the first end of the first switch, the other end of the 3rd electric capacity and the first switch
Second end connect.
Wherein, the first switch is NMOS tube, the drain electrode of the first end correspondence NMOS tube of the first switch, the second of the first switch
The source electrode of the corresponding NMOS tube of end, the grid of the 3rd end correspondence NMOS tube of the first switch.
Wherein, LED light array includes multiple LED being arranged in series.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide a kind of electronic equipment, including
The backlight drive circuit of any of the above-described.
The invention has the beneficial effects as follows: be different from the situation of prior art, presently disclosed backlight drive circuit bag
Include: power input；First inductance, its one end is connected with power input；The other end of diode, its one end and the first inductance
Connect；First electric capacity, is arranged in parallel the two ends at diode；Second electric capacity, its one end is connected with the other end of diode, and it is another
The second inductance ground connection is passed through in one end；LED light array, is arranged in parallel the two ends at the second electric capacity；3rd inductance, its one end and first
The other end of inductance connects, and its other end is by the first switch ground connection；3rd electric capacity, is arranged in parallel the two ends at the first switch；
Wherein, buffer circuit ground connection is passed through in one end of the 3rd inductance, to be absorbed the voltage hair of one end of the 3rd inductance by buffer circuit
Thorn.By the way, the backlight drive circuit of the present invention can absorb the voltage glitch on switching node, reduces backlight drive
The hunting of frequency of circuit so that backlight drive circuit is produced radiation and electromagnetic interference is relatively low, does not affect the chip of electronic equipment
Performance with antenna.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional backlight drive circuit；
Fig. 2 is the structural representation of the backlight drive circuit of the present invention.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
The open a kind of electronic equipment of the present invention, this electronic equipment specifically can with smart mobile phone, television set, panel computer or its
He has the electronic equipment of display.Wherein, electronic equipment includes backlight drive circuit.
As in figure 2 it is shown, Fig. 2 is the structural representation of the backlight drive circuit of the present invention.This backlight drive circuit includes
Power input Vin, the first inductance L1, diode D, the first electric capacity Cj1, the second electric capacity Cout, LED light array the 12, second electricity
Sense Lj2, the 3rd inductance Lj1, the first switch T1, the 3rd electric capacity Cj2, buffer circuit 11 and the 5th electric capacity Cin.
Power input Vin is used for connecting input voltage.
One end of first inductance L1 is connected with power input Vin, the other end of the first inductance L1 and one end of diode D
Connect.The other end of diode D and one end of the second electric capacity Cout connect, and the other end of the second electric capacity Cout passes through the second inductance
Lj2 ground connection, one end of the i.e. second inductance Lj2 is connected with the other end of the second electric capacity Cout, the second inductance Lj2 other end ground connection.
In the present embodiment, the first electric capacity Cj1 is arranged in parallel at the two ends of diode D,
In the present embodiment, LED light array 12 is arranged in parallel the two ends at the second electric capacity Cout, with by the second electric capacity
Cout is that LED light array 12 is powered.Preferably, LED light array 12 includes multiple LED being arranged in series.Certainly, real at other
Executing in example, LED light array 12 can also include multiple LED being arranged in parallel.
One end of 3rd inductance Lj1 is connected with the other end of the first inductance L1, and the 3rd inductance Lj1 other end is opened by first
Close T1 ground connection, and the 3rd electric capacity Cj2 is arranged in parallel at the two ends of the first switch T1.
Specifically, the first switch T1 includes the first end, the second end and the 3rd end, first end of the first switch T1 and the 3rd electricity
The other end of sense Lj1 connects, the second end ground connection of the first switch T1, and the 3rd end of the first switch T1 is connected with controlling end 10, with
Control the conducting of the first switch T1 by controlling end 10, i.e. control end 10 and export the 3rd end controlling signal to the first switch T1
Time, first end of the first switch T1 and the second end conducting of the first switch T1.Further, one end of the 3rd electric capacity Cj2 and the
First end of one switch T1 connects, and second end of the other end of the 3rd electric capacity Cj2 and the first switch T1 connects.
In the present embodiment, the first switch T1 is NMOS tube, the drain electrode of the first end correspondence NMOS tube of the first switch T1, the
The source electrode of the second end correspondence NMOS tube of one switch T1, the grid of the 3rd end correspondence NMOS tube of the first switch T1.Certainly, at it
In his embodiment, the first switch T1 is NPN type triode, the colelctor electrode of the first end correspondence NPN type triode of the first switch T1,
The emitter stage of the second end correspondence NPN type triode of the first switch T1, the 3rd end correspondence NPN type triode of the first switch T1
Base stage.
In the present embodiment, the other end of the first inductance L1 passes through buffer circuit 11 ground connection, to be inhaled by buffer circuit 11
Receive the voltage glitch of the other end of the first inductance L1.Specifically, buffer circuit 11 includes the 4th electric capacity C, resistance R and second switch
T2, one end of second switch T2 is connected with the other end of the first inductance L1, and the other end of second switch T2 connects with one end of resistance R
Connecing, the other end of resistance R and one end of the 4th electric capacity C connect, the other end ground connection of the 4th electric capacity C.When closing at second switch T2
During conjunction, the first switch T1, the 3rd inductance Lj1, second switch T2, resistance R and the 4th electric capacity C-shaped become a grounded circuit, thus
The loop institute that can will be formed at diode D, the second electric capacity Cout, the second inductance Lj2, the first switch T1 and the 3rd inductance Lj1
The shock absorption produced so that voltage glitch will not be produced on the other end of the first inductance L1.
Wherein, second switch T2 is single knife switch.Should be understood that in other embodiments, second switch T2 can be deleted, i.e.
Buffer circuit 11 can only include the 4th electric capacity C and resistance R, and the direct other end with the first inductance L1 in one end of resistance R connects
Connect.
One end of 5th electric capacity Cin is connected with power input Vin, the other end ground connection of the 5th electric capacity Cin, by the 5th
Electric capacity Cin, the voltage that can be inputted power input Vin filters.Certainly, in other embodiments, can be by
Five electric capacity Cin delete.
Should be understood that the capacitance that resistance R is adjustable resistance or the 4th electric capacity C is adjustable, can be according to diode D, the second electricity
After holding the produced vibration in the loop size of Cout, the second inductance Lj2, the first switch T1 and the 3rd inductance Lj1 formation, regulation electricity
The value of resistance R and/or the 4th electric capacity C i.e. can reduce the amplitude of the resonance potential burr of backlight drive circuit.
Should be understood that second switch T2 is provided with control device, this control device is for when the first switch T1 conducting being detected
Second switch T2 is closed.
Or, in other embodiments, control end 10 and control the first switch T1 and conducting of second switch T2 simultaneously, this
Sample, while control end 10 controls the first switch T1 conducting, also controls second switch T2 conducting.Specifically, second switch T2 bag
Including the first end, the second end and the 3rd end, first end of second switch T2 and the other end of the first inductance connect, second switch T2's
Second end is connected with one end of resistance R, and the 3rd end of second switch T2 is connected with controlling end 10, to control the by controlling end 10
The conducting of two switch T2.Preferably, second switch T2 is NMOS tube, the drain electrode of the first end correspondence NMOS tube of second switch T2,
The source electrode of the second end correspondence NMOS tube of second switch T2, the grid of the 3rd end correspondence NMOS tube of second switch T2.Certainly, exist
In other embodiments, second switch T2 is NPN type triode, the current collection of the first end correspondence NPN type triode of second switch T2
Pole, the emitter stage of the second end correspondence NPN type triode of second switch T2, the 3rd end correspondence NPN type three pole of second switch T2
The base stage of pipe.
To sum up, presently disclosed that backlight drive circuit includes: power input；First inductance, its one end and power supply
Input connects；Diode, its one end is connected with the other end of the first inductance；First electric capacity, is arranged in parallel at the two of diode
End；Second electric capacity, its one end is connected with the other end of diode, and its other end passes through the second inductance ground connection；LED light array, and
Connection is arranged on the two ends of the second electric capacity；3rd inductance, its one end is connected with the other end of the first inductance, and its other end passes through first
Switch ground connection；3rd electric capacity, is arranged in parallel the two ends at the first switch；Wherein, one end of the 3rd inductance is connect by buffer circuit
Ground, to absorb the voltage glitch of one end of the 3rd inductance by buffer circuit.By the way, the backlight drive electricity of the present invention
Road can absorb the voltage glitch on switching node, reduces the hunting of frequency of backlight drive circuit so that backlight drive circuit institute
Produce radiation and electromagnetic interference is relatively low, do not affect the chip of electronic equipment and the performance of antenna.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization is originally
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or are directly or indirectly used in what other were correlated with
Technical field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. a backlight drive circuit, it is characterised in that including:
Power input；
First inductance, its one end is connected with described power input；
Diode, its one end is connected with the other end of described first inductance；
First electric capacity, is arranged in parallel the two ends at described diode；
Second electric capacity, its one end is connected with the other end of described diode, and its other end passes through the second inductance ground connection；
LED light array, is arranged in parallel the two ends at described second electric capacity；
3rd inductance, its one end is connected with the other end of described first inductance, and its other end is by the first switch ground connection；
3rd electric capacity, is arranged in parallel the two ends at described first switch；
Wherein, the other end of described first inductance passes through buffer circuit ground connection, to absorb described first by described buffer circuit
The voltage glitch of the other end of inductance.
Backlight drive circuit the most according to claim 1, it is characterised in that described buffer circuit includes the 4th electric capacity and electricity
Resistance, one end of described resistance is connected with the other end of described first inductance, the other end of described resistance and described 4th electric capacity
One end connects, the other end ground connection of described 4th electric capacity.
Backlight drive circuit the most according to claim 2, it is characterised in that described buffer circuit also includes second switch,
One end of described second switch is connected with the other end of described first inductance, the other end of described second switch and described resistance
One end connects.
Backlight drive circuit the most according to claim 3, it is characterised in that described second switch is single knife switch.
Backlight drive circuit the most according to claim 1, it is characterised in that described backlight drive circuit also includes the 5th electricity
Holding, one end of described 5th electric capacity is connected with described power input, the other end ground connection of described 5th electric capacity.
Backlight drive circuit the most according to claim 1, it is characterised in that described first switch include the first end, second
End and the 3rd end, the first end of described first switch is connected with the other end of described 3rd inductance, the second of described first switch
End ground connection, the 3rd end of described first switch is connected with controlling end, to control leading of described first switch by described control end
Logical.
Backlight drive circuit the most according to claim 6, it is characterised in that one end and described first of described 3rd electric capacity
First end of switch connects, and the other end of described 3rd electric capacity is connected with the second end of described first switch.
Backlight drive circuit the most according to claim 7, it is characterised in that described first switch for NMOS tube, described the
The drain electrode of the corresponding described NMOS tube of the first end of one switch, the source electrode of the corresponding described NMOS tube of the second end of described first switch,
The grid of the corresponding described NMOS tube of the 3rd end of described first switch.
Backlight drive circuit the most according to claim 1, it is characterised in that described LED light array includes that multiple series connection sets
The LED put.
10. an electronic equipment, it is characterised in that include the backlight drive circuit as described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610676750.XA CN106251812A (en) | 2016-08-16 | 2016-08-16 | A kind of backlight drive circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610676750.XA CN106251812A (en) | 2016-08-16 | 2016-08-16 | A kind of backlight drive circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106251812A true CN106251812A (en) | 2016-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610676750.XA Pending CN106251812A (en) | 2016-08-16 | 2016-08-16 | A kind of backlight drive circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN106251812A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109658878A (en) * | 2019-03-04 | 2019-04-19 | 合肥惠科金扬科技有限公司 | The backlight drive circuit and display device of display panel |
| CN109905020A (en) * | 2019-03-27 | 2019-06-18 | 浙江大学 | A kind of driving device of integrated buffer circuit |
| US20210225296A1 (en) * | 2018-10-26 | 2021-07-22 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Booster circuit and driving method thereof, backlight module and display device |
| CN114170971A (en) * | 2021-11-05 | 2022-03-11 | 惠州Tcl移动通信有限公司 | Filtering backlight circuit and mobile terminal |
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| CN203673805U (en) * | 2013-12-18 | 2014-06-25 | Tcl康钛汽车信息服务（深圳）有限公司 | Backlight boost circuit and LED backlight drive circuit capable of reducing EMI radiation |
| CN203895095U (en) * | 2014-05-28 | 2014-10-22 | 广州视源电子科技股份有限公司 | Backlight power supply circuit of display screen |
| CN205212694U (en) * | 2015-12-20 | 2016-05-04 | 华南理工大学 | Two boost of common mode rejection do not have bridge PFC converter |
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| CN1346119A (en) * | 2000-09-26 | 2002-04-24 | 三星电子株式会社 | Energy recovering holding circuit for ac plasma display plate |
| CN203406783U (en) * | 2013-08-15 | 2014-01-22 | 大陆汽车电子(芜湖)有限公司 | Step-down circuit and switching power supply |
| CN203673805U (en) * | 2013-12-18 | 2014-06-25 | Tcl康钛汽车信息服务（深圳）有限公司 | Backlight boost circuit and LED backlight drive circuit capable of reducing EMI radiation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210225296A1 (en) * | 2018-10-26 | 2021-07-22 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Booster circuit and driving method thereof, backlight module and display device |
| US11645983B2 (en) * | 2018-10-26 | 2023-05-09 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Booster circuit and driving method thereof, backlight module and display device |
| CN109658878A (en) * | 2019-03-04 | 2019-04-19 | 合肥惠科金扬科技有限公司 | The backlight drive circuit and display device of display panel |
| CN109658878B (en) * | 2019-03-04 | 2024-01-09 | 重庆惠科金扬科技有限公司 | Backlight driving circuit of display panel and display device |
| CN109905020A (en) * | 2019-03-27 | 2019-06-18 | 浙江大学 | A kind of driving device of integrated buffer circuit |
| CN114170971A (en) * | 2021-11-05 | 2022-03-11 | 惠州Tcl移动通信有限公司 | Filtering backlight circuit and mobile terminal |
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Application publication date: 20161221 |