CN107197569A - A kind of LED backlight Drive Protecting Circuit and display device - Google Patents
A kind of LED backlight Drive Protecting Circuit and display device Download PDFInfo
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- CN107197569A CN107197569A CN201710611514.4A CN201710611514A CN107197569A CN 107197569 A CN107197569 A CN 107197569A CN 201710611514 A CN201710611514 A CN 201710611514A CN 107197569 A CN107197569 A CN 107197569A
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- 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
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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 invention belongs to field of display devices, disclose a kind of LED backlight Drive Protecting Circuit and display device, with least all the way LED series winding connect, include the voltage transformation module of voltage needed for for input power to be risen into the LED string normal work；For driving the voltage transformation module to realize the drive module of boosting, the drive module includes driving chip；And for preventing the LED string in positive and negative two terminal shortcircuit; the high pressure of the voltage transformation module output directly fills the protection module for causing the driving chip to damage into the driving chip; wherein, the protection module is at least one, and LED concatenates a protection module described in per road.The LED backlight Drive Protecting Circuit, can effectively protect driving chip not to be damaged in short circuit, save element cost and maintenance time, and design LED output voltages can also be not driven chip internal component pressure limitation.
Description
Technical field
The invention belongs to field of display devices, more particularly to a kind of LED backlight Drive Protecting Circuit and display device.
Background technology
The LED backlight circuit used in currently the majority display screen, in order that LED life is longer, brightness uniformity, it will usually
Constant current is separated using LED multi-path and carrys out work, there is two-way, four tunnels, eight tunnels etc..The scheme of constant current is separated using multichannel, to scheme
Selection it is especially important, scheme conventional at present be all using branch LED by inside driving chip come constant current, due to driving core
The uniformity of piece design, it is possible to well control all be ensure that per electric current all the way in certain scope, not only LED life-span but also
It ensure that the uniformity of complete machine brightness.But with the development of LED industry, the comparison that present LED voltage can all be done is high, some
More than 60V can be reached, that is exactly a fatal defect of comparison for the driving chip of existing constant current scheme.Because
It is typically all below 60V that the driving chip of existing frequently-used constant current scheme is pressure-resistant, mainly due to the consideration of design cost, internal resistance to
Pressure be made higher, driving chip cost will it is expensive accordingly a lot.
Therefore, traditional LED backlight circuit, which exists, needs to use the high driving chip of internal pressure voltage so that driving chip
The problem of cost is high.
The content of the invention
It is an object of the invention to provide a kind of LED backlight Drive Protecting Circuit and display device, traditional LED back ofs the body are solved
Optical circuit, which exists, needs to use the high driving chip of internal pressure voltage so that the high problem of driving chip cost.
A kind of LED backlight Drive Protecting Circuit, including：It is connected with power input, it is described for input power to be risen to
The voltage transformation module of voltage needed for LED string normal work；It is connected with the voltage transformation module, for driving the voltage
Modular converter realizes the drive module of boosting, and the drive module includes driving chip；And with the driving chip and described
Voltage transformation module is connected, for preventing the LED string in positive and negative two terminal shortcircuit, the height of the voltage transformation module output
Pressure directly fills the protection module for causing the driving chip to damage into the driving chip, wherein, the protection module is at least
One, LED concatenates a protection module described in per road.
Further, the protection module includes：First resistor, second resistance, the first electric capacity and a voltage-stabiliser tube；Described
One resistance and the second resistance are connected on the LED current of the driving chip and absorbed between pin and the negative pole of the LED, institute
State the first electric capacity and the voltage-stabiliser tube is connected in parallel between the first resistor and the public connecting end and ground of the second resistance.
Further, the pressure voltage of the voltage-stabiliser tube is below the pressure voltage of the driving chip.
Further, the voltage transformation module includes：It is connected with power input, for being carried out to the input power
The filter unit of filtering；It is connected with the filter unit and the driving chip, for the direct current exported to the filter unit
The boosting unit that voltage is boosted；And be connected with the boosting unit and the driving chip, for the voltage conversion
Direct current after module boosting carries out the detection unit of overvoltage detection and over-current detection.
Further, the filter unit includes：Second electric capacity and 3rd resistor；Second electric capacity and the 3rd electricity
Resistance is connected in parallel between the power input and ground.
Further, the boosting unit includes：First inductance, the first diode, a metal-oxide-semiconductor and the 3rd electric capacity；It is described
First inductance, first diode and the 3rd electric capacity are connected between the output end of the filter unit and ground, and institute
The common port of the first diode and the 3rd electric capacity is stated as the output end of the boosting unit, the drain electrode of the metal-oxide-semiconductor connects
The anode of first diode, the source ground of the metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor connects the boosting of the driving chip
Drive output pin.
Further, the detection unit includes：4th resistance, the 5th resistance, the 6th resistance and the 7th resistance；Described
Four resistance and the 5th resistant series are between the output end and ground of the boosting unit, the 4th resistance and the described 5th
The overvoltage protection pin of the commonly connected termination driving chip of resistance, the 6th resistance and the 7th resistant series exist
Between the current detecting input pin and ground of the driving chip, the public connecting end of the 6th resistance and the 7th resistance with
The source electrode connection of the metal-oxide-semiconductor.
Further, the driving chip uses AP3064 chips.
Further, the driving chip has：The switching on and shutting down control of enable signal for receiving controlling switch machine is drawn
Pin；And for receiving the brightness adjustment control pin of brightness regulated signal.
A kind of display device, including at least LED string and above-mentioned LED backlight Drive Protecting Circuit all the way.
Above-mentioned LED backlight Drive Protecting Circuit and display device, add protection mould between LED and driving chip
Block, even if the positive and negative two ends output short-circuits of LED, it is possibility to have effect protection driving chip will not be damaged in short circuit, save member
Part cost and maintenance time, and design LED output voltages can also be not driven chip internal component pressure limitation.
Brief description of the drawings
Fig. 1 is a kind of circuit module schematic diagram of LED backlight Drive Protecting Circuit of the invention.
Fig. 2 is a kind of circuit theory diagrams of LED backlight Drive Protecting Circuit shown in Fig. 1.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, a kind of LED backlight Drive Protecting Circuit and display device in presently preferred embodiments of the present invention, and extremely
Few series winding of LED all the way connects, situation about being connect present embodiment illustrates being contacted with four paths of LEDs lamps, including：Protection module 11, voltage
Modular converter 12 and drive module 13；Voltage transformation module 12 is connected with power input, for input voltage to be risen into LED
Voltage needed for string normal work；Drive module 13 is connected with voltage transformation module 12, is realized for driving voltage modular converter 12
Boosting；Protection module 11 and driving chip U1 and voltage transformation module 12 are connected, for preventing positive and negative two terminal shortcircuit of LED string
When, the high pressure that voltage transformation module 12 is exported, which is directly filled into driving chip U1, causes driving chip U1 to damage, wherein, protection module
11 be at least one, concatenates a protection module 11 per paths of LEDs lamp, in the present embodiment, shows relative with four paths of LEDs lamp strings
Four protection modules 11 answered.
Referring to Fig. 2, voltage transformation module 12 is made up of filter unit, boosting unit and the part of detection unit three, wherein,
Filter unit includes filter capacitor and resistance, and filter capacitor can be an electric capacity or the serial or parallel connection structure of more than one electric capacity
Into capacitance group, resistance is at least one, and resistance and electric capacity or capacitance group parallel connection constitute filter unit, and the present embodiment is electric capacity
C1, electric capacity C2, electric capacity C3, resistance R1 and resistance R2 are simultaneously connected between voltage input end and ground and constitute filter unit, wherein, electricity
It is electrochemical capacitor to hold C1, and filter unit is exported after being filtered to the 24V direct currents of input.
Further, the input of boosting unit connects the output end of filter unit, and boosting unit exports filter unit
The magnitude of voltage that rises to required for LED string normal work of voltage；Specifically, boosting unit includes：Inductance L1, diode D1,
Diode D2, diode D3, metal-oxide-semiconductor Q1, resistance R10, resistance R5, resistance R7, resistance R9, electric capacity C7, electric capacity C8, electric capacity C9,
Electric capacity C11, electric capacity C12 and LED string；The output end of inductance L1 the first termination filter unit, inductance L1 the second termination two
Pole pipe D3 anode, electric capacity C9, electric capacity C11 and electric capacity C12 are simultaneously connected between diode D3 negative electrode and ground, electric capacity C7 and electricity
Diode D3 two ends are attempted by after resistance R10 series connection, metal-oxide-semiconductor Q1 grid is exported by the resistance R5 drivings for meeting driving chip U1
Pin OUT, diode D1 anode connects metal-oxide-semiconductor Q1 grid, and diode D1 negative electrode connects driving chip U1 driving output pin
OUT, resistance R7 is connected between metal-oxide-semiconductor Q1 grid and metal-oxide-semiconductor Q1 source electrode, and metal-oxide-semiconductor Q1 drain electrode connects diode D1 anode,
Diode D1 negative electrode connects electric capacity C8 first end, and electric capacity C8 the second end ground connection, resistance R9 is attempted by diode D1 two ends,
The positive pole of LED string connects the output end of boosting unit, and the negative pole of LED string connects protection location.
The BOOST circuit that boosting unit is mainly around driving chip U1 to be designed to, boost inductance L1 and metal-oxide-semiconductor
Q1 and commutation diode D3 are the three big elements for constituting booster circuit；Driving chip U1 the 7th pin OUT is driving output pin, is gone
Metal-oxide-semiconductor Q1 is driven to realize the function of boosting, in charging process, driving chip U1 driving output pin OUT output high level,
Metal-oxide-semiconductor Q1 is turned on, and at this moment, input voltage is grounded after inductance L1 and metal-oxide-semiconductor Q1 and resistance R26, and diode D3 prevents electric capacity
C9, electric capacity C11 and electric capacity C12 discharge over the ground, and what it is due to input is 24V direct currents, so the electric current on inductance L1 is with certain
Ratio is linearly increasing, with the electric current increase on inductance L1, and some energy are stored in inductance L1；In discharge process, metal-oxide-semiconductor
Q1 ends, due to the electric current retention performance of inductance, and 0 will not be immediately become by flowing through inductance L1 electric current, but slow by charging
Value when finishing is changed into 0, and original circuit has disconnected, and then inductance can only be discharged by novel circuit, that is, the 24V voltages inputted
And inductance L1 starts to charge to electric capacity C9, electric capacity C11 and electric capacity C12, the voltage liter at electric capacity C9, electric capacity C11 and electric capacity C12 two ends
Height, now voltage be already higher than input voltage, i.e., boosting finish, boost process is exactly the energy transmission mistake of an inductance in fact
Journey, during charging, inductance L1 absorbs energy, and inductance L1 releases energy during electric discharge, if capacitance is sufficiently large, then in boosting unit
Output end can just keep a lasting electric current in discharge process, if the process of this break-make is constantly repeated, it is possible to
The voltage higher than input voltage is obtained at electric capacity two ends.Although having used electric capacity C9, electric capacity C11 and tri- electricity of electric capacity C12 herein
Hold, but in actual applications, be not intended to limit using three electric capacity, the quantity of electric capacity can be one or more.
Resistance R10, resistance R5, resistance R7, resistance R9, electric capacity C7, electric capacity C8, diode D1 and two poles in boosting unit
Pipe D3 shields to metal-oxide-semiconductor, effective absorbing peak pulse, ceiling voltage during limitation metal-oxide-semiconductor shut-off, prevents
Metal-oxide-semiconductor is damaged because of shut-off overvoltage.
Further, detection unit is connected with boosting unit and driving chip U1, and detection unit is divided into two parts, a part
For realizing over-pressed detection, a part is used to realize over-current detection.
The part of overvoltage detection includes：Resistance R11, resistance R33 and electric capacity C10；Resistance R11 the first termination boosting unit
Output end, resistance R11 the second termination driving chip U1 overvoltage protection pin OVP, resistance R33 and electric capacity C10 simultaneously couple
Between resistance R11 the second end and ground.Resistance R11 and resistance R33 are connected between the output end of boosting unit and ground, resistance
R11 and resistance R33 are divider resistances, and the overvoltage protection pin OVP of driving chip false voltage point is 2V, when being input to OVP
When the voltage of point is more than 2V, driving chip U1 the 7th pin OUT stops output pulse, realizes the overvoltage protection to circuit.
The part of over-current detection includes：Resistance R26, resistance R6 and electric capacity C6；Resistance R26 is attempted by metal-oxide-semiconductor Q1 source electrode
Between ground, resistance R6 the first termination metal-oxide-semiconductor Q1 source electrode, the current detecting input of resistance R6 the second termination driving chip
Pin CS, electric capacity C6 the first termination resistance R6 the second end, electric capacity C6 the second end ground connection.Resistance R26 is over-current detection
Resistance, when the overtension on resistance R26, a part for high current flows through resistance R26 ground connection, and another part electric current flows through electricity
Driving chip U1 current detecting pin CS, resistance R6 are input to after resistance R6 can also play a part of a current limliting, drive core
Piece U1 and current-limiting resistance complete corresponding overcurrent protection function jointly.
Further, drive module 13 is connected with voltage transformation module 12 and protection module 11, the drive in drive module 13
Dynamic chip is AP3064 chips, can complete the function that four groups of LED carry out independent constant current respectively, four groups of electric currents are all by resistance
R21 is set, and is completed by driving chip U1 the 2nd pin current settings pin ISET, due to being come permanent using internal triode
Stream, thus internal triode it is pressure-resistant be it is limited, it is 65V that the highest of current driving chip is pressure-resistant.In addition, drive module is also wrapped
Switching on and shutting down and dimming function have been included, have been drawn respectively by the 5th foot control machine controlling switch EN of driving chip and the 12nd pin brightness adjustment control
Pin DIM is completed, and dimming scope is 20%~100%；Switching on and shutting down part is by driving chip U1, resistance R13, resistance R14 and electricity
Hold C13 compositions, resistance R13 first end receives enable the signal ENA, resistance R13 of the mainboard transmission of display device the second end
The enable signal ENA that mainboard is exported in driving chip U1 switching on and shutting down controlling switch EN, display device is met to send by resistance R13
Switching on and shutting down controlling switch EN, resistance R14 and electric capacity C13 to driving chip U1 are connected in parallel between resistance R13 the second end and ground,
Realize power on/off function；Dimming portion is made up of driving chip U1, resistance R15, resistance R19 and electric capacity C17, and the of resistance R15
One end receives the brightness regulated signal ADJ of the mainboard output of display device, resistance R15 the second termination driving chip U1 light modulation
The brightness regulated signal ADJ that mainboard is exported in controlling switch DIM, display device is sent to driving chip U1's by resistance R15
Brightness adjustment control pin DIM, resistance R19 and electric capacity C17 are simultaneously connected between resistance R15 the second end and ground, realize dimming function.
Further, protection module 11 and driving chip U1 and voltage transformation module 12 are connected, for preventing LED string just
During minus two terminal shortcircuit, the high pressure that voltage transformation module 12 is exported, which is directly filled into driving chip U1, causes driving chip U1 to damage；This
In embodiment, LED string is not shown, illustrate only the interface CN1 and CN2 of LED string and corresponding with four groups of LEDs concatenation mouths
Four groups of LED protection modules 11 of connection, including：First group of protection module is by resistance R28, resistance R29, electric capacity C18 and voltage stabilizing two
Pole pipe ZD1 is constituted；Second group of protection module is made up of resistance R30, resistance R31, electric capacity C19 and voltage-stabiliser tube ZD2；3rd group of protection
Module is made up of resistance R32, resistance R34, electric capacity C20 and voltage-regulator diode ZD3；4th group of protection module is by resistance R35, resistance
R36, electric capacity C21 and voltage-regulator diode ZD4 compositions；Wherein, voltage-regulator diode ZD1~ZD4 pressure voltage is less than 65V, resistance R28
~resistance R32 and resistance R34~resistance R36 are current-limiting resistances, and electric capacity C18~electric capacity C21 is to play anti-clutter, is had
Some spikes of the absorption of effect, also there is certain defencive function to driving chip U1；Resistance R29 first end connects first
The negative pole of LED, resistance the R29 connection of the second end electric capacity C18, resistance R28, the first termination driving chip U1 the 13rd pin electricity
Source absorbs pin CH1, and resistance R28 the second terminating resistor R29 the second end, voltage-stabiliser tube ZD1 and electric capacity C18 is connected in parallel on resistance R29
Between second end and ground, the annexation for obtaining component in other three groups of protection modules 11 can be similarly corresponded to；Inside four tunnels
There are short-circuit conditions all the way in any of which, and voltage all can carry out voltage stabilizing by corresponding current-limiting resistance and voltage-regulator diode, this
Sample, even if the both positive and negative polarity short circuit in output stand CN1 and CN2, will not also give driving chip U1 and damage, and due in protection
The pressure voltage of the voltage-stabiliser tube set in module 11 is less than driving chip U1 pressure voltage, therefore LED output voltage can be first passed through
Exported again after the voltage-stabilizing protection of protection module 11 and give driving chip U1, so, design LED output voltages can also be not driven chip
The pressure-resistant limitation of U1 inner members.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of LED backlight Drive Protecting Circuit, and at least LED series winding connects all the way, it is characterised in that including：
It is connected with power input, the voltage conversion of voltage needed for for input power to be risen into the LED string normal work
Module；
It is connected with the voltage transformation module, for driving the voltage transformation module to realize the drive module of boosting, the drive
Dynamic model block includes driving chip；And
It is connected with the driving chip and the voltage transformation module, for preventing the LED string in positive and negative two terminal shortcircuit,
The high pressure of the voltage transformation module output directly fills the protection module for causing the driving chip to damage into the driving chip,
Wherein, the protection module is at least one, and LED concatenates a protection module described in per road.
2. LED backlight Drive Protecting Circuit as claimed in claim 1, it is characterised in that the protection module includes：
First resistor, second resistance, the first electric capacity and a voltage-stabiliser tube；
The LED current that the first resistor and the second resistance are connected on the driving chip absorbs pin and the LED
Between negative pole, first electric capacity and the voltage-stabiliser tube are connected in parallel on the public connecting end of the first resistor and the second resistance
Between ground.
3. LED backlight Drive Protecting Circuit as claimed in claim 2, it is characterised in that the pressure voltage of the voltage-stabiliser tube is in institute
State below the pressure voltage of driving chip.
4. LED backlight Drive Protecting Circuit as claimed in claim 1, it is characterised in that the voltage transformation module includes：
It is connected with power input, for the filter unit being filtered to the input power；
It is connected with the filter unit and the driving chip, for being boosted to the DC voltage that the filter unit is exported
Boosting unit；And
It is connected with the boosting unit and the driving chip, for being carried out to the direct current after voltage transformation module boosting
Overvoltage detection and the detection unit of over-current detection.
5. LED backlight circuit backlight drive protection circuit as claimed in claim 4, it is characterised in that the filter unit
Including：
Second electric capacity and 3rd resistor；
Second electric capacity and the 3rd resistor are connected in parallel between the power input and ground.
6. LED backlight Drive Protecting Circuit as claimed in claim 4, it is characterised in that the boosting unit includes：
First inductance, the first diode, a metal-oxide-semiconductor and the 3rd electric capacity；
First inductance, first diode and the 3rd electric capacity are connected on the output end and ground of the filter unit
Between, and first diode and the 3rd electric capacity common port as the boosting unit output end, the metal-oxide-semiconductor
Drain electrode connects the anode of first diode, and the source ground of the metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor connects the driving chip
Boosting driving output pin.
7. LED backlight Drive Protecting Circuit as claimed in claim 6, it is characterised in that the detection unit includes：
4th resistance, the 5th resistance, the 6th resistance and the 7th resistance；
4th resistance and the 5th resistant series are between the output end and ground of the boosting unit, the 4th resistance
With the overvoltage protection pin of the commonly connected termination driving chip of the 5th resistance, the 6th resistance and the described 7th
Resistant series are between the current detecting input pin and ground of the driving chip, the public affairs of the 6th resistance and the 7th resistance
Connection end is connected with the source electrode of the metal-oxide-semiconductor altogether.
8. the LED backlight Drive Protecting Circuit as described in any one of claim 1 to 7, it is characterised in that the driving chip is adopted
Use AP3064 chips.
9. LED backlight Drive Protecting Circuit as claimed in claim 1, it is characterised in that the driving chip has：
For the switching on and shutting down controlling switch for the enable signal for receiving controlling switch machine；And
Brightness adjustment control pin for receiving brightness regulated signal.
10. a kind of display device, including at least LED string all the way, it is characterised in that the display device includes claim 1
To the LED backlight Drive Protecting Circuit described in 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611514.4A CN107197569A (en) | 2017-07-25 | 2017-07-25 | A kind of LED backlight Drive Protecting Circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611514.4A CN107197569A (en) | 2017-07-25 | 2017-07-25 | A kind of LED backlight Drive Protecting Circuit and display device |
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| CN107197569A true CN107197569A (en) | 2017-09-22 |
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| CN201710611514.4A Pending CN107197569A (en) | 2017-07-25 | 2017-07-25 | A kind of LED backlight Drive Protecting Circuit and display device |
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Cited By (4)
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| CN107845367A (en) * | 2017-11-13 | 2018-03-27 | 合肥惠科金扬科技有限公司 | Multifunctional led backlight drive circuit and display device |
| CN108207062A (en) * | 2018-01-31 | 2018-06-26 | 珠海雷特科技股份有限公司 | A kind of high-voltage LED controller for possessing output short circuit protection function |
| CN113219233A (en) * | 2021-04-30 | 2021-08-06 | 石家庄宇飞电子有限公司 | Voltage expansion circuit for high-side current sampling |
| CN114120896A (en) * | 2021-12-03 | 2022-03-01 | 合肥新沪屏蔽泵有限公司 | LED indicates HPB bearing wearing and tearing gauge outfit for canned motor pump |
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| CN108207062A (en) * | 2018-01-31 | 2018-06-26 | 珠海雷特科技股份有限公司 | A kind of high-voltage LED controller for possessing output short circuit protection function |
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| CN113219233A (en) * | 2021-04-30 | 2021-08-06 | 石家庄宇飞电子有限公司 | Voltage expansion circuit for high-side current sampling |
| CN114120896A (en) * | 2021-12-03 | 2022-03-01 | 合肥新沪屏蔽泵有限公司 | LED indicates HPB bearing wearing and tearing gauge outfit for canned motor pump |
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