CN206212335U - Short-circuit protection circuit, LED backlight driving circuit and display screen - Google Patents
Short-circuit protection circuit, LED backlight driving circuit and display screen Download PDFInfo
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- CN206212335U CN206212335U CN201621040733.9U CN201621040733U CN206212335U CN 206212335 U CN206212335 U CN 206212335U CN 201621040733 U CN201621040733 U CN 201621040733U CN 206212335 U CN206212335 U CN 206212335U
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- 239000004065 semiconductor Substances 0.000 claims description 41
- 230000005611 electricity Effects 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 229910052732 germanium Inorganic materials 0.000 description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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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Abstract
The utility model discloses a short-circuit protection circuit, LED drive circuit and display screen are shaded. The short-circuit protection circuit is used for protecting a target circuit when the target circuit is short-circuited, and comprises: the input end of the short circuit triggering module is electrically connected with the first end of the target circuit and is used for accessing triggering voltage for the short circuit protection circuit from the first end during short circuit; the input end of the self-locking protection module is electrically connected with the output end of the short circuit trigger module, the output end of the self-locking protection module is electrically connected with the second end of the target circuit, and the self-locking protection module forms self-locking through the trigger voltage to isolate the target circuit. The utility model provides a technical scheme accessible trigger voltage forms the auto-lock and makes the target circuit keep apart to protect the target circuit when the target circuit short circuit.
Description
Technical field
The utility model embodiment is related to liquid crystal tv technology field, more particularly to a kind of short-circuit protection circuit, LED-backlit
Drive circuit and display screen.
Background technology
With the development of science and technology, LED liquid crystal television technology is fast-developing.Wherein, display screen is LED liquid crystal television
Important component, back light unit provides illumination for display screen, and the normal work to display screen plays an important role, general backlight
Unit is driven by backlight drive circuit.
Fig. 1 is that liquid crystal television mainboard is powered the structural representation powered with LED backlight drive circuit in the prior art.As schemed
Shown in 1, civil power by after flyback AC/DC converter 10, output all the way voltage V1 as the defeated of LED backlight drive circuit 20
Enter voltage, export another road voltage V2 for LED backlight drive circuit 20 is powered, and voltage V2 is input into TV motherboard simultaneously
30, through TV motherboard 30 process after output signal V3 to LED backlight drive circuit 20 as drive signal.
Fig. 2 is LED backlight drive circuit of the prior art, is provided with external metal-oxide-semiconductor.As shown in Fig. 2 metal-oxide-semiconductor
The grid of M1 is controlled by backlight control IC, and when metal-oxide-semiconductor M1 is turned on, input voltage V1 is by inductance L and resistance R3 for inductance L fills
Electricity, inductance L storage energy；When metal-oxide-semiconductor M1 ends, input voltage V1 and inductance L is charged by diode VD1 to electric capacity C1,
So that the voltage at electric capacity C1 two ends is equal to input voltage V1 and inductance L both end voltage sums, so as to reach the purpose of boosting, it is
The positive pole of LED provides driving voltage, and the drain electrode of external metal-oxide-semiconductor M2 is connected with LED negative poles, and the grid of external metal-oxide-semiconductor M2 is by signal
V3 is controlled, for LED negative poles provide driving voltage.Resistance R1 is the driving resistance of metal-oxide-semiconductor M1 in Fig. 2, and resistance R2 is external metal-oxide-semiconductor
The driving resistance of M2, resistance R3 is the electric current inductive reactance that electric current is detected for backlight control IC.
However, if LED is short-circuited, when external metal-oxide-semiconductor M2 is turned on, the grounded drain of external metal-oxide-semiconductor M2 is input into electricity
Pressure V1 ground connection, causes flyback AC/DC converter 10 to open self-protection, and restarts, output voltage V1 and voltage V2,
Voltage V2 passes through the output signal V3 of TV motherboard 30 simultaneously, under the control of signal V3, when external metal-oxide-semiconductor M2 is turned on, due to
LED short circuits, the LED positive pole driving voltage moments obtained by boosting add to the drain electrode of external metal-oxide-semiconductor M2 so that external metal-oxide-semiconductor
The drain electrode of M2 is larger with the voltage that source electrode moment bears, and causes external metal-oxide-semiconductor M2 to damage, so as to cause LED backlight drive circuit
20 damage.
Utility model content
The utility model provides a kind of short-circuit protection circuit, LED backlight drive circuit and display screen, to realize objective circuit
When short-circuit, objective circuit is protected.
In a first aspect, the utility model embodiment provides a kind of short-circuit protection circuit, in objective circuit short circuit
Protection objective circuit.The short-circuit protection circuit includes：
Short-circuit trigger module, the input of the short-circuit trigger module is electrically connected with the first end of the objective circuit, is used
For the short-circuit protection circuit accesses trigger voltage from the first end when short circuit；
Self-lock protection module, the input of the self-lock protection module is electrically connected with the output end of the short-circuit trigger module
Connect, the output end of the self-lock protection module is electrically connected with the second end of the objective circuit, the self-lock protection module passes through
The trigger voltage forms self-locking isolates the objective circuit.
Second aspect, the utility model embodiment additionally provides a kind of LED backlight drive circuit, and the LED-backlit drives electricity
Road includes：Short-circuit protection circuit in BOOST boost modules, external metal-oxide-semiconductor and the utility model embodiment,
Wherein, the BOOST boost modules are electrically connected with the positive pole of the LED, and drive is provided for the positive pole for the LED
Dynamic voltage；The drain electrode of the external metal-oxide-semiconductor is electrically connected with the negative pole of the LED, and driving electricity is provided for the negative pole for the LED
Pressure；The input of the short-circuit trigger module is electrically connected with the negative pole of the LED, the output end of the self-lock protection module and institute
The grid electrical connection of external metal-oxide-semiconductor is stated, the external metal-oxide-semiconductor is protected during for LED short circuits.
The third aspect, the utility model embodiment additionally provides a kind of display screen, and the display screen includes display unit, backlight
LED backlight drive circuit in unit and the utility model embodiment,
Wherein, the display unit is electrically connected with the back light unit, and the back light unit is used to be the display unit
Screen display backlight is provided；
The LED backlight drive circuit is electrically connected with the back light unit, and it is described that the LED backlight drive circuit is used for
Back light unit provides driving voltage.
The utility model accesses trigger voltage, self-lock protection module when causing objective circuit short circuit by short-circuit trigger module
Self-locking is formed by trigger voltage and causes that objective circuit is isolated, so as in objective circuit short circuit, protect objective circuit.
Brief description of the drawings
Fig. 1 is that liquid crystal television mainboard is powered the structural representation powered with backlight drive circuit in the prior art；
Fig. 2 is LED backlight drive circuit in the prior art；
Fig. 3 is the structural representation of the short-circuit protection circuit in the utility model embodiment one；
Fig. 4 is the structural representation of the short-circuit protection circuit in the utility model embodiment two；
Fig. 5 is the structural representation of the short-circuit protection circuit in the utility model embodiment three；
Fig. 6 is the structural representation of the LED backlight drive circuit in the utility model example IV；
Fig. 7 is the structural representation of the display screen in the utility model embodiment five.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explanation the utility model, rather than to restriction of the present utility model.Further need exist for
It is bright, for the ease of description, part rather than the entire infrastructure related to the utility model is illustrate only in accompanying drawing.
Embodiment one
Fig. 3 is the structural representation of the short-circuit protection circuit that the utility model embodiment one is provided.As shown in figure 3, this reality
The short-circuit protection circuit for applying example offer includes：Short-circuit trigger module 110 and self-lock protection module 120.
Wherein, the input of short-circuit trigger module 110 is electrically connected with the first end of objective circuit, is short circuit during for short circuit
Protection circuit accesses trigger voltage from first end；The output end of the input of self-lock protection module 120 and short-circuit trigger module 110
Electrical connection, the output end of self-lock protection module 120 is electrically connected with the second end of objective circuit, and self-lock protection module 120 is by touching
Generating swaging isolates objective circuit into self-locking.
Exemplary, when objective circuit is short-circuited, short-circuit protection circuit passes through short-circuit trigger module 110 from objective circuit
First end access larger trigger voltage, triggering self-lock protection module 120 forms self-locking so that objective circuit is isolated,
Reach the purpose of protection objective circuit.
The short-circuit protection circuit that the present embodiment is provided accesses triggering when causing objective circuit short circuit by short-circuit trigger module
Voltage, self-lock protection module forms self-locking and causes that objective circuit is isolated by trigger voltage, so as in objective circuit short circuit, protect
Shield objective circuit.
Embodiment two
Fig. 4 is the structural representation of the short-circuit protection circuit that the utility model embodiment two is provided.The present embodiment is to upper
State further illustrating for embodiment.As shown in figure 4, the short-circuit protection circuit that the present embodiment is provided also includes：Bias voltage is provided
Module 230, bias voltage provides module 230 and is electrically connected with self-lock protection module 220, for being provided for self-lock protection module 220
Bias voltage.
Accordingly, the short-circuit protection circuit that the present embodiment is provided includes：Short-circuit trigger module 210, short-circuit trigger module 210
Input electrically connected with the first end of objective circuit, during for short circuit for short-circuit protection circuit from first end access triggering electricity
Pressure；Self-lock protection module 220, the input of self-lock protection module 220 is electrically connected with the output end of short-circuit trigger module 210, from
The output end for locking protection module 220 is electrically connected with the second end of objective circuit, and self-lock protection module 220 is formed by trigger voltage
Self-locking isolates objective circuit；Bias voltage provides module 230, and bias voltage provides module 230 with the electricity of self-lock protection module 220
Connection, for providing bias voltage for self-lock protection module 220.
In such scheme, when objective circuit is not short-circuited, bias voltage module 230 can be self-lock protection module 220
Bias voltage is provided, for preventing when objective circuit is not short-circuited, the error starting of self-lock protection module 220 forms self-locking and leads
Objective circuit isolation is caused, and then ensures that objective circuit can normal work in the case where not being short-circuited.
The short-circuit protection circuit that the present embodiment is provided passes through bias voltage module for self-lock protection module provides bias voltage,
When objective circuit can be prevented not to be short-circuited, self-lock protection module error starting, forming self-locking causes objective circuit to be isolated, Jin Erbao
Card objective circuit can normal work in the case where not being short-circuited.
Embodiment three
Fig. 5 is the structural representation of the short-circuit protection circuit that the utility model embodiment three is provided.The present embodiment is to upper
State further illustrating for embodiment.As shown in figure 5, the short-circuit protection circuit that the present embodiment is provided includes short-circuit trigger module 310
With self-lock protection module 320, wherein, the input of short-circuit trigger module 310 is electrically connected with the first end of objective circuit, for short
Lu Shiwei short-circuit protection circuits access trigger voltage from first end；The input of self-lock protection module 320 and short-circuit trigger module
310 output end electrical connection, the output end of self-lock protection module 320 is electrically connected with the second end of objective circuit, self-lock protection mould
Block 320 forms self-locking by trigger voltage isolates objective circuit.Further, short-circuit trigger module 310 is specifically included：Voltage stabilizing
Diode VD2, first resistor R4 and second resistance R5,
Wherein, the negative pole of voltage-regulator diode VD2 is electrically connected with the first end of objective circuit, the positive pole of voltage-regulator diode VD2
First end with first resistor R4 is electrically connected, and second end of first resistor R4 electrically connects with the first end of second resistance R5, and second
The second end ground connection of resistance R5.
Exemplary, when objective circuit is not short-circuited, the negative pole of voltage-regulator diode VD2 passes through the first of objective circuit
Terminate into less voltage, less than the threshold value of voltage-regulator diode VD2 so that voltage-regulator diode VD2 ends, then short-circuit protection circuit
It is not triggered when objective circuit is not short-circuited.
It is exemplary, when objective circuit is short-circuited, the first end that the negative pole of voltage-regulator diode VD2 passes through objective circuit
Larger trigger voltage is accessed, more than the threshold value of voltage-regulator diode VD2 so that voltage-regulator diode VD2 is turned on.
Preferably, the output end of short-circuit trigger module 310 is second end of first resistor R4.
Preferably, voltage-regulator diode VD2 is 2.4V voltage-regulator diodes, and the resistance of first resistor R4 is 470 Ω, second resistance
The resistance of R5 is 47k Ω.
In such scheme, optionally, self-lock protection module 320 includes：First triode VT1 and the second triode VT2,
Wherein, the base stage of the first triode VT1 is electrically connected with short-circuit trigger module 310, the emitter stage of the first triode VT1
Ground connection, the colelctor electrode of the first triode VT1 electrically connects with the base stage of the second triode VT2, the colelctor electrode of the second triode VT2 and
The base stage electrical connection of the first triode VT1, the emitter stage of the second triode VT2 is electrically connected with the second end of objective circuit.
In such scheme, optionally, the first triode VT1 is NPN type triode, and the second triode VT2 is positive-negative-positive three
Pole pipe.
Preferably, the base stage of the first triode VT1 is electrically connected with second end of first resistor R4.
Specifically, the base stage of the first triode VT1 is connected with second end of first resistor R4, as voltage-regulator diode VD2
After conducting, the trigger voltage higher accessed by the first end of objective circuit adds to the first end and second resistance of first resistor R4
Second end of R5, after first resistor R4 and second resistance R5 partial pressures, second terminal voltage of first resistor R4 is higher than the one or three pole
The on state threshold voltage of pipe VT1, i.e. voltage U between the first triode VT1 base stages and emitter stageBE1Higher than on state threshold voltage,
Therefore the first triode VT1 conductings, then the collector voltage of the first triode VT1 is pulled low.Due to the base of the second triode VT2
Pole electrically connects with the colelctor electrode of the first triode VT1, therefore, the base voltage of the second triode VT2 is pulled low, and works as objective circuit
The second end when having voltage signal so that the voltage U between the emitter stage and base stage of the second triode VT2EB2Higher than conduction threshold
Voltage, then the second triode VT2 be also switched on.While second triode VT2 is turned on, the second terminal voltage of objective circuit is by the
Voltage U between two triode VT2 emitter stages and colelctor electrodeEC2Pressure drop, adds to the base stage of the first triode VT1.Due to triode
Conducting after, the voltage of emitter stage and inter-collector, i.e. saturation voltage drop is smaller, exemplary, and the saturation voltage drop of germanium tube is 0.1V,
The saturation voltage drop of silicone tube is 0.3V.Therefore after the second triode VT2 conductings, the base stage and emitter stage of the first triode VT1 can be made
Between voltage UBE1More than on state threshold voltage so that the first triode VT1 is further turned on, positive feedback is formed, and then formed
Self-locking.
When the first triode VT1 is both turned on the second triode VT2, after forming self-locking, then the second end of objective circuit is electric
Pressure may be locked in the voltage of very little, i.e. the second terminal voltage of objective circuit be the second triode VT2 emitter and collector it
Between voltage UEC2And the voltage U between the base stage and emitter stage of the first triode VT1BE1Sum.After triode ON, base
Conducting voltage between pole and emitter stage is smaller, exemplary, and the conducting voltage of germanium tube is 0.3V, and the conducting voltage of silicone tube is
0.7V.Exemplary, when the first triode VT1 and the second triode VT2 are silicone tube, the second terminal voltage of objective circuit is
1V.Exemplary, when the first triode VT1 and the second triode VT2 are germanium tube, the second terminal voltage of objective circuit is
Therefore when objective circuit short circuit, the second terminal voltage of objective circuit is locked in less voltage to 0.4V.
Exemplary, when the second end of objective circuit is the grid of metal-oxide-semiconductor, because the condition of metal-oxide-semiconductor conducting is metal-oxide-semiconductor
Grid and source electrode between voltage be more than cut-in voltage (2V-5V), therefore, when objective circuit short circuit when, short-circuit protection circuit
The grid voltage of metal-oxide-semiconductor can be made to be locked in 1V or so so that MOS cannot be turned on, and then realize protection objective circuit.
In such scheme, optionally, the short-circuit protection circuit that the present embodiment is provided also includes：Bias voltage provides module
330, bias voltage provides module 330 to be included：The first end of 3rd resistor R6,3rd resistor R6 is electric with the second end of objective circuit
Connection, second end of 3rd resistor R6 electrically connects with the base stage of the second triode VT2.
Exemplary, when objective circuit is not short-circuited, the second triode VT2 misleads, i.e. the second triode VT2's
Voltage U between emitter stage and base stageEB2During more than conducting voltage, 3rd resistor R6 can be provided for the base stage of the second triode VT2
Second terminal voltage signal of certain bias voltage, i.e. objective circuit is through 3rd resistor R6 partial pressures, second end of 3rd resistor R6
For the base stage of the second triode VT2 provides certain bias voltage, the base voltage of the second triode VT2 is improved so that second
Voltage U between the emitter stage and base stage of triode VT2EB2Less than conducting voltage, so as to prevent the second triode VT2 from misleading,
Cause self-lock protection module 320 to form self-locking, and then ensure that objective circuit can normal work in the case where not being short-circuited.
Preferably, the resistance of 3rd resistor R6 is 10k Ω.
In such scheme, optionally, self-lock protection module 320 also includes the first electric capacity C2 and the second electric capacity C3.
Wherein, the first end of the first electric capacity C2 is electrically connected with the base stage of the first triode VT1, second end of the first electric capacity C2
Emitter stage with the first triode VT2 is electrically connected, and the first end of the second electric capacity C3 is electrically connected with the base stage of the second triode VT2,
Second end of the second electric capacity C3 electrically connects with the emitter stage of the second triode VT2.
First electric capacity C2 and the second electric capacity C3 can realize filtering the effect of noise, it is to avoid due to noise jamming, cause first
Triode VT1 and the second triode VT2 mislead, so as to prevent misleading due to the first triode VT1 and the second triode VT2
It is logical, cause self-lock protection module 320 to form self-locking, and then ensure that objective circuit can normal work in the case where not being short-circuited
Make.
Preferably, the capacitance of the first electric capacity C2 and the second electric capacity C3 is 0.1 μ F.
The short-circuit protection circuit that the present embodiment is provided accesses triggering when causing objective circuit short circuit by short-circuit trigger module
Voltage, triggering self-lock protection module forms self-locking and causes that objective circuit is isolated, so as in objective circuit short circuit, protect target electricity
Road.By 3rd resistor for self-lock protection module provides certain bias voltage, prevent the second triode from misleading so that self-locking
Protection module forms self-locking, and then ensures that objective circuit can normal work in the case where not being short-circuited.By the first electric capacity
Noise is filtered with the second electric capacity, it is to avoid due to noise jamming, cause the first triode and the second triode misleads so that self-locking
Protection module forms self-locking, and then ensures that objective circuit can normal work in the case where not being short-circuited.
Example IV
The structural representation of the LED backlight drive circuit that Fig. 6 is provided for the utility model example IV.As shown in fig. 6, this
The LED backlight drive circuit that embodiment is provided includes：BOOST boost modules 410, external metal-oxide-semiconductor 420 and above-mentioned any implementation
The short-circuit protection circuit 430 that example is provided.
Wherein, BOOST boost modules 410 are electrically connected with the positive pole of LED, and driving voltage is provided for the positive pole for LED,
In back light, LED is generally not single presence, but the LED light bar of multiple LED compositions, it is LED in this Unify legislation.
In the present embodiment, external metal-oxide-semiconductor 420 is equivalent to need objective circuit to be protected, drain electrode and the LED negative electricities of external metal-oxide-semiconductor 420
Connection, driving voltage is provided for the negative pole for LED；The input of short-circuit trigger module 431 is electrically connected with the negative pole of LED,
Electrically connected equivalent to the drain electrode with external metal-oxide-semiconductor 420；The grid of the output end of self-lock protection module 432 and external metal-oxide-semiconductor 420
Electrical connection, external metal-oxide-semiconductor 420 is protected during for LED short circuits.
Exemplary, input voltage V1 is boosted to certain voltage value by BOOST boost modules 410, for the positive pole of LED is provided
Driving voltage, the drain electrode of external metal-oxide-semiconductor 420 is electrically connected with the negative pole of LED, the source ground of external metal-oxide-semiconductor 420 or by resistance
R7 is grounded, and driving voltage is provided for the negative pole for LED.Wherein resistance R7 is backlight constant current detection resistance, for detecting LED's
Whether electric current is constant current.When LED is short-circuited, short-circuit trigger module 431 is electrically connected by with LED negative poles, access compared with
Trigger voltage high, triggering self-lock protection module 432 forms self-locking, and the grid voltage of external metal-oxide-semiconductor 420 is locked in necessarily
Value so that external metal-oxide-semiconductor 420 cannot be turned on, during so as to realizing that LED is short-circuited, it is to avoid because external metal-oxide-semiconductor 420 drain electrode and
Source electrode bears moment big voltage and damages, and then protects external metal-oxide-semiconductor 420.
Exemplary, the LED negative poles in the input of the short-circuit trigger module 431 of short-circuit protection circuit and Fig. 2 can be connected
Connect, the output end of self-lock protection module 432 is connected with resistance R2 left sides one end in Fig. 2, then in LED short circuits, short-circuit protection electricity
Road is by the voltage lockout of resistance R2 left sides one end in certain value so that external metal-oxide-semiconductor M2 cut-offs, so that input voltage V1 does not connect
Ground, flyback AC/DC converter 10 no longer restarts, and weight is constantly born in the drain electrode and source electrode that can avoid external metal-oxide-semiconductor M2
Moment big voltage is opened, and then realizes the external metal-oxide-semiconductor M2 of protection.
In such scheme, optionally, short-circuit protection circuit 430 also includes that bias voltage provides module 433, protects with self-locking
Shield module 432 is electrically connected, for providing bias voltage for self-lock protection module 432.
The short-circuit protection that the short-circuit protection function of above-mentioned LED backlight drive circuit can be provided by any embodiment of the present invention
Circuit realizes possessing the corresponding functional module of short-circuit protection circuit and beneficial effect.Not detailed description in the present embodiment
Ins and outs, reference can be made to the short-circuit protection circuit that any embodiment of the present invention is provided.
Embodiment five
Fig. 7 is the structural representation of the display screen that the utility model embodiment five is provided.As shown in fig. 7, the present embodiment is carried
The display screen of confession includes：The LED backlight drive circuit 530 that display unit 510, back light unit 520 and above-described embodiment are provided.
Wherein, display unit 510 is electrically connected with back light unit 520, and back light unit 520 is used to be provided for display unit 510
Screen display backlight；
LED backlight drive circuit 530 is electrically connected with back light unit 520, and LED backlight drive circuit 530 is used to be backlight list
Unit 520 provides driving voltage.
The LED-backlit that LED backlight drive circuit in above-mentioned display screen can be provided by any embodiment of the present invention drives
Circuit realizes possessing the corresponding functional module of LED backlight drive circuit and beneficial effect.Not detailed description in the present embodiment
Ins and outs, reference can be made to the LED backlight drive circuit that any embodiment of the present invention is provided.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore, although by above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, more other Equivalent embodiments can also be included, and scope of the present utility model is by appended
Right determine.
Claims (9)
1. a kind of short-circuit protection circuit, for protecting objective circuit in objective circuit short circuit, it is characterised in that including：
Short-circuit trigger module, the input of the short-circuit trigger module is electrically connected with the first end of the objective circuit, for short
Short-circuit protection circuit described in Lu Shiwei accesses trigger voltage from the first end；
Self-lock protection module, the input of the self-lock protection module is electrically connected with the output end of the short-circuit trigger module, institute
State the output end of self-lock protection module to be electrically connected with the second end of the objective circuit, the self-lock protection module is touched by described
Generating swaging isolates the objective circuit into self-locking.
2. short-circuit protection circuit according to claim 1, it is characterised in that also provide module including bias voltage, it is described
Bias voltage provides module and is electrically connected with the self-lock protection module, for providing bias voltage for the self-lock protection module.
3. short-circuit protection circuit according to claim 1, it is characterised in that the short-circuit trigger module includes：Voltage stabilizing two
Pole pipe, first resistor and second resistance,
Wherein, the negative pole of the voltage-regulator diode is electrically connected with the first end of the objective circuit, and the voltage-regulator diode is just
Pole electrically connects with the first end of the first resistor, and the second end and the first end of the second resistance of the first resistor are electrically connected
Connect, the second end ground connection of the second resistance.
4. short-circuit protection circuit according to claim 2, it is characterised in that the self-lock protection module, including：One or three
Pole pipe and the second triode,
The base stage of wherein described first triode is electrically connected with the short-circuit trigger module, and the emitter stage of first triode connects
Ground, the colelctor electrode of first triode is electrically connected with the base stage of second triode, the colelctor electrode of second triode
Base stage with first triode is electrically connected, and the emitter stage of second triode is electrically connected with the second end of the objective circuit
Connect.
5. short-circuit protection circuit according to claim 4, it is characterised in that first triode is NPN type triode,
Second triode is PNP type triode.
6. short-circuit protection circuit according to claim 4, it is characterised in that the bias voltage provides module to be included：The
Three resistance, the first end of the 3rd resistor is electrically connected with the second end of the objective circuit, the second end of the 3rd resistor
Base stage with second triode is electrically connected.
7. short-circuit protection circuit according to claim 4, it is characterised in that the self-lock protection module also includes the first electricity
Hold and the second electric capacity,
Wherein, the first end of first electric capacity is electrically connected with the base stage of first triode, and the second of first electric capacity
End electrically connects with the emitter stage of first triode, and the first end of second electric capacity is electric with the base stage of second triode
Connection, the second end of second electric capacity electrically connects with the emitter stage of second triode.
8. a kind of LED backlight drive circuit, for driving LED, it is characterised in that including BOOST boost modules, external metal-oxide-semiconductor
And the short-circuit protection circuit described in claim any one of 1-7,
Wherein, the BOOST boost modules are electrically connected with the positive pole of the LED, and driving electricity is provided for the positive pole for the LED
Pressure；The drain electrode of the external metal-oxide-semiconductor is electrically connected with the negative pole of the LED, and driving voltage is provided for the negative pole for the LED；
The input of the short-circuit trigger module is electrically connected with the negative pole of the LED, the output end of the self-lock protection module with it is described
The grid electrical connection of external metal-oxide-semiconductor, the external metal-oxide-semiconductor is protected during for LED short circuits.
9. a kind of display screen, it is characterised in that driven including the LED-backlit described in display unit, back light unit and claim 8
Dynamic circuit,
Wherein, the display unit is electrically connected with the back light unit, and the back light unit is used to be provided for the display unit
Screen display backlight；
The LED backlight drive circuit is electrically connected with the back light unit, and the LED backlight drive circuit is used to be the backlight
Unit provides driving voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621040733.9U CN206212335U (en) | 2016-09-06 | 2016-09-06 | Short-circuit protection circuit, LED backlight driving circuit and display screen |
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| CN201621040733.9U CN206212335U (en) | 2016-09-06 | 2016-09-06 | Short-circuit protection circuit, LED backlight driving circuit and display screen |
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Cited By (3)
| 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 |
| WO2020133633A1 (en) * | 2018-12-27 | 2020-07-02 | 惠科股份有限公司 | Display panel booster circuit, boost control method, and display apparatus |
| CN112531650A (en) * | 2020-12-07 | 2021-03-19 | 华羿微电子股份有限公司 | From power MOSFET who takes short-circuit protection |
-
2016
- 2016-09-06 CN CN201621040733.9U patent/CN206212335U/en active Active
Cited By (4)
| 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 |
| WO2020133633A1 (en) * | 2018-12-27 | 2020-07-02 | 惠科股份有限公司 | Display panel booster circuit, boost control method, and display apparatus |
| US11100884B2 (en) | 2018-12-27 | 2021-08-24 | HKC Corporation Limited | Booster circuit of display panel, boost control method and display device |
| CN112531650A (en) * | 2020-12-07 | 2021-03-19 | 华羿微电子股份有限公司 | From power MOSFET who takes short-circuit protection |
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