CN207235158U - 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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- CN207235158U CN207235158U CN201720910183.XU CN201720910183U CN207235158U CN 207235158 U CN207235158 U CN 207235158U CN 201720910183 U CN201720910183 U CN 201720910183U CN 207235158 U CN207235158 U CN 207235158U
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Abstract
The utility model belongs to field of display devices, discloses a kind of LED backlight Drive Protecting Circuit and display device, and at least LED light string is connected all the way, including for input power to be risen to the voltage transformation module of voltage needed for the LED light 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 light 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 damage into the driving chip; wherein, the protection module is at least one that LED light 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 not also chip internal component pressure driven limitation.
Description
Technical field
The utility model 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 to make LED life 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, currently used scheme 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 per electric current all the way all in certain scope, not only ensure that LED service life but also
It ensure that the uniformity of complete machine brightness.But with the development of LED industry, the voltage of present LED can all do it is higher, some
More than 60V can be reached, that is for the driving chip of existing constant current scheme, the defects of being exactly one more fatal.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 very much.
Therefore, traditional LED backlight circuit, which exists, needs using the high driving chip of internal pressure voltage so that driving chip
The problem of of high cost.
Utility model content
The purpose of this utility model is to provide a kind of LED backlight Drive Protecting Circuit and display device, solve traditional
There is the driving chip for needing to use internal pressure voltage high in LED backlight circuit so that driving chip problem of high 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 light 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 connects, for preventing the LED light 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 damage into the driving chip, wherein, the protection module is at least
One, LED light concatenates a protection module described in per road.
Further, the protection module includes：First resistor, second resistance, the first capacitance and a voltage-stabiliser tube；Described
The LED current that one resistance and the second resistance are connected on the driving chip is absorbed between foot and the anode of the LED light, institute
State the first capacitance 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 boosts；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 capacitance and 3rd resistor；Second capacitance 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 capacitance；It is described
First inductance, first diode and the 3rd capacitance are connected between the output terminal and ground of the filter unit, and institute
Output terminal of the common port of the first diode and the 3rd capacitance as the boosting unit is stated, the drain electrode of the metal-oxide-semiconductor connects
The anode of first diode, the source electrode ground connection of the metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor connect 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 resistance are connected between the output terminal 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 resistance are connected on
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
Foot；And for receiving the brightness adjustment control pin of brightness regulated signal.
A kind of display device, including at least LED light 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 light and driving chip
Block, even if the positive and negative both 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 not also chip internal component pressure driven limitation.
Brief description of the drawings
Fig. 1 is a kind of circuit module schematic diagram of LED backlight Drive Protecting Circuit of the utility model.
Fig. 2 is a kind of circuit diagram of LED backlight Drive Protecting Circuit shown in Fig. 1.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
Referring to Fig. 1, a kind of LED backlight Drive Protecting Circuit and display device in the preferred embodiment of the utility model,
With at least LED light string is connected all the way, present embodiment illustrates situation about being connected with four paths of LEDs lamp strings, including：Protection module 11,
Voltage transformation module 12 and drive module 13；Voltage transformation module 12 is connected with power input, for input voltage to be risen to
Voltage needed for LED light string normal work；Drive module 13 is connected with voltage transformation module 12, for driving voltage modular converter 12
Realize boosting；Protection module 11 and driving chip U1 and voltage transformation module 12 are connected, for preventing the positive and negative both ends of LED light string short
Lu Shi, the high pressure that voltage transformation module 12 exports, which is directly filled into driving chip U1, causes driving chip U1 to damage, wherein, protect mould
Block 11 is at least one, connects a protection module 11 per paths of LEDs lamp string, in the present embodiment, shows and four paths of LEDs lamp string phases
Corresponding four protection modules 11.
Referring to Fig. 2, voltage transformation module 12 is made of filter unit, boosting unit and detection unit three parts, wherein,
Filter unit includes filter capacitor and resistance, and filter capacitor can be the serial or parallel connection structure of a capacitance or more than one capacitance
Into capacitance group, resistance is at least one, resistance and capacitance or capacitance group is in parallel forms filter unit, and the present embodiment is capacitance
C1, capacitance C2, capacitance C3, resistance R1 and resistance R2 are simultaneously connected between voltage input end and ground and form filter unit, wherein, electricity
It is electrolytic capacitor to hold C1, and filter unit exports after being filtered to the 24V direct currents of input.
Further, the output terminal of the input terminal connection filter unit of boosting unit, boosting unit export filter unit
Voltage rise to LED light string and work normally required magnitude 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, capacitance C7, capacitance C8, capacitance C9,
Capacitance C11, capacitance C12 and LED light string；The output terminal of the first termination filter unit of inductance L1, the second termination two of inductance L1
The anode of pole pipe D3, capacitance C9, capacitance C11 and capacitance C12 are simultaneously connected between the cathode and ground of diode D3, capacitance C7 and electricity
The both ends of diode D3 are attempted by after resistance R10 series connection, the grid of metal-oxide-semiconductor Q1 connects the driving output of driving chip U1 by resistance R5
Foot OUT, the anode of diode D1 connect the grid of metal-oxide-semiconductor Q1, and the cathode of diode D1 connects the driving output pin of driving chip U1
OUT, resistance R7 are connected between the grid of metal-oxide-semiconductor Q1 and the source electrode of metal-oxide-semiconductor Q1, and the drain electrode of metal-oxide-semiconductor Q1 connects the anode of diode D1,
The cathode of diode D1 connects the first end of capacitance C8, the second end ground connection of capacitance C8, and resistance R9 is attempted by the both ends of diode D1,
The cathode of LED light string connects the output terminal of boosting unit, and the anode of LED light string connects protection location.
Boosting unit is mainly a BOOST circuit to be designed to, boost inductance L1 and metal-oxide-semiconductor around driving chip U1
Q1 and rectifier diode D3 is the three big elements for forming booster circuit；The 7th foot OUT of driving chip U1 is driving output pin, is gone
Metal-oxide-semiconductor Q1 is driven to realize the function of boosting, in charging process, the driving output pin OUT output high level of driving chip U1,
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 capacitance
C9, capacitance C11 and capacitance 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, and with the electric current increase on inductance L1, some energy are stored in inductance L1；In discharge process, metal-oxide-semiconductor
Q1 ends, and due to the electric current retention performance of inductance, 0 will not be immediately become by flowing through the electric current of inductance L1, but slowly 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 capacitance C9, capacitance C11 and capacitance C12, the voltage liter at capacitance C9, capacitance C11 and capacitance C12 both ends
Height, at this time 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 terminal can keep a lasting electric current in discharge process, if the process of this break-make constantly repeats, it is possible to
The voltage higher than input voltage is obtained at capacitance both ends.Although capacitance C9, capacitance C11 and tri- electricity of capacitance C12 have been used herein
Hold, but in practical applications, it is not intended to limit using three capacitances, the quantity of capacitance can be one or more.
Resistance R10, resistance R5, resistance R7, resistance R9, capacitance C7, capacitance C8, diode D1 and two poles in boosting unit
Pipe D3 shields metal-oxide-semiconductor, effective absorbing peak pulse, and ceiling voltage when limitation metal-oxide-semiconductor turns 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
Over-pressed detection is used for realization, a part is used for realization over-current detection.
The part of overvoltage detection includes：Resistance R11, resistance R33 and capacitance C10；The first termination boosting unit of resistance R11
Output terminal, overvoltage protection the pin OVP, resistance R33 and capacitance C10 of the second termination driving chip U1 of resistance R11 simultaneously couple
Between the second end of resistance R11 and ground.Resistance R11 and resistance R33 are connected between the output terminal of boosting unit and ground, resistance
R11 and resistance R33 is divider resistance, and the false voltage point of the overvoltage protection pin OVP of driving chip is 2V, when being input to OVP
When the voltage of point is more than 2V, the 7th foot OUT of driving chip U1 stops output pulse, realizes the overvoltage protection to circuit.
The part of over-current detection includes：Resistance R26, resistance R6 and capacitance C6；Resistance R26 is attempted by the source electrode of metal-oxide-semiconductor Q1
Between ground, the source electrode of the first termination metal-oxide-semiconductor Q1 of resistance R6, the current detecting input of the second termination driving chip of resistance R6
The second end of the first termination resistance R6 of foot CS, capacitance C6, the second end ground connection of capacitance C6.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
Current detecting the pin CS, resistance R6 of driving chip U1 are input to after resistance R6 can also play the role 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 to pass through resistance
R21 is set, and is completed by the 2nd foot electric current setting pin ISET of driving chip U1, 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 driving chip is pressure-resistant at present.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 foot brightness adjustment control
Foot 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, the first end of resistance R13 receives the enable signal ENA that the mainboard of display device is sent, the second end of resistance R13
Meet the switching on and shutting down controlling switch EN of driving chip U1, the enable signal ENA that mainboard exports in display device is sent by resistance R13
Switching on and shutting down controlling switch EN, resistance R14 and capacitance C13 to driving chip U1 are connected in parallel between second end and the ground of resistance R13,
Realize power on/off function；Dimming portion is made of driving chip U1, resistance R15, resistance R19 and capacitance C17, and the of resistance R15
One end receives the brightness regulated signal ADJ of the mainboard output of display device, the light modulation of the second termination driving chip U1 of resistance R15
Controlling switch DIM, the brightness regulated signal ADJ that mainboard exports in display device are sent to driving chip U1's by resistance R15
Brightness adjustment control pin DIM, resistance R19 and capacitance C17 are simultaneously connected between second end and the ground of resistance R15, realize dimming function.
Further, protection module 11 and driving chip U1 and voltage transformation module 12 are connected, for preventing LED light string just
During minus two terminal shortcircuit, the high pressure of the output of voltage transformation module 12, which is directly filled into driving chip U1, causes driving chip U1 to damage；This
In embodiment, LED light string is not shown, illustrate only the interface CN1 and CN2 of LED light string and corresponding with four groups of LED light string interfaces
Four groups of LED protection modules 11 of connection, including：First group of protection module is by resistance R28, resistance R29, capacitance C18 and voltage stabilizing two
Pole pipe ZD1 is formed；Second group of protection module is made of resistance R30, resistance R31, capacitance C19 and voltage-stabiliser tube ZD2；3rd group of protection
Module is made of resistance R32, resistance R34, capacitance C20 and zener diode ZD3；4th group of protection module is by resistance R35, resistance
R36, capacitance C21 and zener diode ZD4 compositions；Wherein, the pressure voltage of zener diode ZD1~ZD4 is less than 65V, resistance R28
~resistance R32 and resistance R34~resistance R36 is current-limiting resistance, and capacitance C18~capacitance C21 is to play anti-clutter, is had
Some sharp pulses of the absorption of effect, also have driving chip U1 certain defencive function；The first end of resistance R29 connects first
The anode of LED light, second end connection the capacitance C18, resistance R28 of resistance R29, the first termination driving chip U1 the 13rd foot electricity
Source absorbs foot CH1, the second end of the second terminating resistor R29 of resistance R28, and voltage-stabiliser tube ZD1 and capacitance C18 is connected in parallel on resistance R29
Between second end and ground, it can similarly correspond to obtain the connection relation of component in other three groups of protection modules 11；Inside four tunnels
There are short-circuit conditions all the way in any of which, and voltage all can pass through corresponding current-limiting resistance and zener diode carries out voltage stabilizing, this
Sample, even if the positive and negative anodes short circuit in output stand CN1 and CN2, will not give damage driving chip U1, and due to protecting
The pressure voltage of the voltage-stabiliser tube set in module 11 is less than the pressure voltage of driving chip U1, therefore the output voltage of LED can first pass through
Exported again after 11 voltage-stabilizing protection of protection module and give driving chip U1, in this way, design LED output voltages can not also chip driven
The pressure-resistant limitation of U1 built-in components.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of LED backlight Drive Protecting Circuit, and at least LED light string is connected all the way, it is characterised in that including：
It is connected with power input, for input power to be risen to the voltage conversion of voltage needed for the LED light 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 light 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 damage into the driving chip,
Wherein, the protection module is at least one that LED light 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 capacitance and a voltage-stabiliser tube；
The LED current that the first resistor and the second resistance are connected on the driving chip absorbs foot and the LED light
Between anode, first capacitance 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, the DC voltage for being exported to the filter unit boosts
Boosting unit；And
It is connected with the boosting unit and the driving chip, is carried out for the direct current after boosting to the voltage transformation module
Overvoltage detection and the detection unit of over-current detection.
5. LED backlight Drive Protecting Circuit as claimed in claim 4, it is characterised in that the filter unit includes：
Second capacitance and 3rd resistor；
Second capacitance 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 capacitance；
First inductance, first diode and the 3rd capacitance are connected on the output terminal and ground of the filter unit
Between, and output terminal of the common port of first diode and the 3rd capacitance as the boosting unit, the metal-oxide-semiconductor
Drain electrode connects the anode of first diode, the source electrode ground connection of the metal-oxide-semiconductor, and 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 resistance are connected between the output terminal 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
Resistance is connected between the current detecting input pin of the driving chip and ground, the public affairs of the 6th resistance and the 7th resistance
Connecting pin is connected with the source electrode of the metal-oxide-semiconductor altogether.
8. such as claim 1 to 7 any one of them LED backlight Drive Protecting Circuit, it is characterised in that the driving chip is adopted
With AP3064 chips.
9. LED backlight Drive Protecting Circuit as claimed in claim 1, it is characterised in that the driving chip has：
Switching on and shutting down controlling switch for the enable signal for receiving controlling switch machine；And
For receiving the brightness adjustment control pin of brightness regulated signal.
10. a kind of display device, including at least LED light string all the way, it is characterised in that the display device includes claim 1
To 9 any one of them LED backlight Drive Protecting Circuits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720910183.XU CN207235158U (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 |
|---|---|---|---|
| CN201720910183.XU CN207235158U (en) | 2017-07-25 | 2017-07-25 | A kind of LED backlight Drive Protecting Circuit and display device |
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| CN207235158U true CN207235158U (en) | 2018-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197569A (en) * | 2017-07-25 | 2017-09-22 | 合肥惠科金扬科技有限公司 | A kind of LED backlight Drive Protecting Circuit and display device |
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2017
- 2017-07-25 CN CN201720910183.XU patent/CN207235158U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197569A (en) * | 2017-07-25 | 2017-09-22 | 合肥惠科金扬科技有限公司 | A kind of LED backlight Drive Protecting Circuit and display device |
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