CN106953300A - A kind of protective circuit of switch power source and display device - Google Patents
A kind of protective circuit of switch power source and display device Download PDFInfo
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- CN106953300A CN106953300A CN201710243860.1A CN201710243860A CN106953300A CN 106953300 A CN106953300 A CN 106953300A CN 201710243860 A CN201710243860 A CN 201710243860A CN 106953300 A CN106953300 A CN 106953300A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of protective circuit of switch power source and display device, wherein, the protective circuit of switch power source includes power source protective module, division module and voltage comparison module；The corresponding reference voltage of each lamp bar is exported to voltage comparison module after carrying out partial pressure to the operating voltage of each lamp bar by division module; compare the reference voltage of each lamp bar by voltage comparison module; when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value; voltage comparison module outputs control signals to power source protective module; control the power source protective module to open, Switching Power Supply is protected.By detecting the operating voltage of each lamp bar, when the pressure difference of different lamp bars is excessive, startup power supply is protected, it is to avoid power work is also solved due to the locked problem of power supply caused by signal error in abnormal condition, improves the reliability of power supply.
Description
Technical field
The present invention relates to appliances power source technical field, more particularly to a kind of protective circuit of switch power source and display device.
Background technology
It is well known that in field of display devices, the EN signals that constant current chip is sent to mainboard have sequential to want with pwm signal
Ask, screen body can be caused to light after EN signals are with pwm signal sequence error, power supply can be caused locked problem occur, or
Person can cause power source temperature too high when power supply short circuit is tested, and power supply can be in non-normal working during each lamp bar asymmetrical voltage
Situations such as region, can bring different degrees of power safety hidden danger, cause the damage of power supply or integral device.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of protective circuit of switch power source and
Display device, by detecting the operating voltage of each lamp bar, when the pressure difference of different lamp bars is excessive, startup power supply is protected, it is to avoid
Power work is also solved due to the locked problem of power supply caused by signal error in abnormal condition, and improve power supply can
By property.
In order to achieve the above object, this invention takes following technical scheme：
A kind of protective circuit of switch power source, including power source protective module, it also includes division module and voltage comparison module；By dividing
Die block exports the corresponding reference voltage of each lamp bar to voltage comparison module after carrying out partial pressure to the operating voltage of each lamp bar,
Compare the reference voltage of each lamp bar by voltage comparison module, when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value
When, voltage comparison module outputs control signals to power source protective module, controls the power source protective module to open, to Switching Power Supply
Protected.
In described protective circuit of switch power source, the division module includes several partial pressure lists corresponding with lamp bar quantity
Member, each partial pressure unit carries out voltage division processing to the operating voltage of connected lamp bar, and exports corresponding reference voltage extremely
Voltage comparison module.
In described protective circuit of switch power source, the voltage comparison module includes logic unit, control unit and output
Unit；The reference voltage of each lamp bar is exported to control unit after carrying out logical operation through logic unit, and control unit is any
Control output unit conducting when the difference of the reference voltage of two lamp bars is more than predetermined threshold value, output unit outputs control signals to power supply
Protection module, controls the power source protective module to open.
In described protective circuit of switch power source, each partial pressure unit includes the first divider resistance, the second divider resistance
With the 3rd divider resistance, first divider resistance connects the voltage output end of each lamp bar, first divider resistance it is another
One end connection voltage comparison module, one end that the 3rd divider resistance is also connected by the second divider resistance, the 3rd partial pressure electricity
The other end ground connection of resistance.
In described protective circuit of switch power source, the logic unit includes some groups of diodes corresponding with lamp bar quantity
Group, every group of diode group includes the first diode and the second diode, the positive pole and the second diode of first diode
Negative pole connection correspondence partial pressure unit output end, the negative pole of first diode connects the input of described control unit,
The positive pole of second diode connects the control end of described control unit.
In described protective circuit of switch power source, described control unit include first resistor, second resistance, 3rd resistor,
4th resistance, the first electric capacity and the first triode；One end of the first resistor connects the negative pole of the first diode, described first
The other end of resistance connects the hair of one end, one end of 3rd resistor, one end of the first electric capacity and the first triode of second resistance
Emitter-base bandgap grading；The other end ground connection of the second resistance；The other end of the 3rd resistor connects the other end of the first electric capacity, the 4th electricity
One end of resistance and the base stage of the first triode；The other end of 4th resistance connects the positive pole of the second diode；Described first
The colelctor electrode of triode connects the output unit.
In described protective circuit of switch power source, the output unit includes the 5th resistance, the 6th resistance and the three or two pole
Pipe；One end of 5th resistance connects the colelctor electrode of first triode, the other end connection the 3rd of the 5th resistance
The positive pole of diode, the negative pole of the 3rd diode connects power source protective module by the 6th resistance.
In described protective circuit of switch power source, first triode is PNP type triode.
A kind of display device, it includes protective circuit of switch power source as described above.
In the protective circuit of switch power source and display device that are provided compared to prior art, the present invention, the Switching Power Supply
Protection circuit includes power source protective module, division module and voltage comparison module；By work electricity of the division module to each lamp bar
Pressure exports the corresponding reference voltage of each lamp bar to voltage comparison module after carrying out partial pressure, compares each lamp by voltage comparison module
The reference voltage of bar, when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value, voltage comparison module output control letter
Number to power source protective module, control the power source protective module to open, Switching Power Supply is protected.By detecting each lamp bar
Operating voltage, startup power supply is protected when the pressure difference of different lamp bars is excessive, it is to avoid power work in abnormal condition, and
Solve due to the locked problem of power supply caused by signal error, improve the reliability of power supply.
Brief description of the drawings
The structured flowchart for the protective circuit of switch power source that Fig. 1 provides for the present invention；
The circuit diagram of division module in the protective circuit of switch power source Application Example that Fig. 2 provides for the present invention；
The structured flowchart of voltage comparison module in the protective circuit of switch power source Application Example that Fig. 3 provides for the present invention；
The circuit diagram of voltage comparison module in the protective circuit of switch power source Application Example that Fig. 4 provides for the present invention.
Embodiment
The present invention provides a kind of protective circuit of switch power source and display device, by detecting the operating voltage of each lamp bar,
Startup power supply is protected when the pressure difference of different lamp bars is excessive, it is to avoid power work in abnormal condition, and also solve due to
The locked problem of power supply caused by signal error, improves the reliability of power supply.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
The protective circuit of switch power source that the present invention is provided can be applicable in multi-field different electrical power, and for example TV is electromechanical
Source, think thing voltage, LED illumination power supply, projecting apparatus and medicine equipment etc. field, the Switching Power Supply for various equipment is provided
Reliable power protection, referring to Fig. 1, the protective circuit of switch power source that the present invention is provided includes power source protective module 10, partial pressure
Module 20 and voltage comparison module 30, the division module 20, voltage comparison module 30 and power source protective module 10 are sequentially connected,
Division module 20 is also connected with the voltage output end of each lamp bar in display device, the work by division module 20 to each lamp bar
Voltage exports the corresponding reference voltage of each lamp bar to voltage comparison module 30 after carrying out partial pressure, is compared by voltage comparison module 30
The reference voltage of each lamp bar, when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value, voltage comparison module 30 is defeated
Go out control signal to power source protective module 10, control the power source protective module 10 to open, Switching Power Supply is protected.
The present invention is carried out after partial pressure by detecting the operating voltage of the lamp bar of each in display device to each operating voltage
Corresponding reference voltage is exported, the reference voltage of all lamp bars is compared by voltage comparison module 30, when between any two lamp bars
Reference voltage difference when being more than predetermined threshold value, then control power source protective module 10 to open, protection switch power supply immediately, it is to avoid open
Powered-down source is in abnormal operating state, reduces the fault rate of power supply and whole machine, heretofore described power source protective module 10
It can be current existing power protection chip, because it is prior art, not be described further herein.
Specifically, also referring to Fig. 2, the division module 20 includes several partial pressure units corresponding with lamp bar quantity
201, the voltage output end of one end connection correspondence lamp bar of each partial pressure unit 201, the other end connection of each partial pressure unit 201
Voltage comparison module 30, carries out voltage division processing, and export by each partial pressure unit 201 to the operating voltage of connected lamp bar
Corresponding reference voltage, to voltage comparison module 30, is that subsequent voltage compares the reliable Voltage Reference of offer.It is understood that
The present invention is not construed as limiting to the quantity of lamp bar quantity and partial pressure unit 201, and producer can need flexibly to be selected according to specific product
Select, in following Application Example, the quantity of lamp bar quantity and partial pressure unit 201 is explained with two.
Further, also referring to Fig. 3, the voltage comparison module 30 includes logic unit 301, control unit 302
With output unit 303, the logic unit 301, control unit 302 and output unit 303 are sequentially connected, the logic unit
301 are also connected with the output end of each partial pressure unit 201, and the output unit 303 is also connected with power source protective module 10；Each lamp bar
Reference voltage through logic unit 301 carry out logical operation after export to control unit 302, control unit 302 is in any two lamp
Control output unit 303 is turned on when the difference of the reference voltage of bar is more than predetermined threshold value, and output unit 303 outputs control signals to electricity
Source protection module 10, controls the power source protective module 10 to open.
During specific implementation, partial pressure unit 201 is carried out after partial pressure to the operating voltage of each lamp bar, by corresponding reference voltage
Output to logic unit 301 carries out logical operation, is controlled when the reference voltage difference of any two lamp bars is more than predetermined threshold value
Output unit 303 is turned on, and such as current voltage highest lamp bar is more than default threshold with the direct voltage difference of the minimum lamp bar of voltage
Value, then control output unit 303 to turn on, and is protected so as to export high level to voltage by the output pin UVP of voltage comparison module 30
Module is protected, power protection is triggered, it is to avoid power work effectively improves the reliability and security of power supply in abnormal condition.
Referring to Fig. 2, in the protective circuit of switch power source that the present invention is provided, each partial pressure unit 201 includes the
One divider resistance, the second divider resistance and the 3rd divider resistance, first divider resistance connect the voltage output of each lamp bar
End, the other end of first divider resistance connects voltage comparison module 30, also passes through the second divider resistance the 3rd partial pressure of connection
One end of resistance, the other end ground connection of the 3rd divider resistance.As shown in Fig. 2 in Application Example of the present invention, partial pressure unit
201 quantity and the quantity of lamp bar are two, then it is the first partial pressure to correspond to the 11st resistance R11 and the 21st resistance R21
Resistance, the 12nd resistance R12 and the 22nd resistance R22 are the second divider resistance, the 13rd resistance R13 and the 23rd resistance
R23 is the 3rd divider resistance, and voltage LED1 and the LED2 voltage of two lamp strings pass through the 11st resistance R11, the 12nd electricity respectively
Resistance R12, the 13rd resistance R13 and the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23 partial pressures are obtained
To corresponding reference voltage（That is LED1A and LED2A voltages）Afterwards, output this to voltage comparison module 30, as voltage ratio compared with
Reference value.
Specifically, also referring to Fig. 4, the logic unit 301 includes some groups of diodes corresponding with lamp bar quantity
Group, every group of diode group includes the first diode and the second diode, the positive pole and the second diode of first diode
Negative pole connection correspondence partial pressure unit 201 output end, i.e. the first divider resistance the other end, the negative pole of first diode
The input of described control unit 302 is connected, the positive pole of second diode connects the control end of described control unit 302.
Similarly, the present invention is also not construed as limiting to the quantity of diode group, can flexibly increase and decrease diode according to lamp bar quantity
Quantity, as shown in figure 4, in Application Example of the present invention, two groups of diode groups are correspondingly provided with according to the quantity of lamp bar, i.e.,
11 diode D11 and the 12nd diode D12 are one group, and the 21st diode D21 and the 22nd diode D22 are another
One group, wherein the 11st diode D11 and the 21st diode D21 correspond to the first diode above, the 12nd
Pole pipe D12 and the 22nd diode D22 correspond to the second diode above, if need to increase lamp bar quantity, increase phase
The diode group number answered, improves the scope of application for the protective circuit of switch power source that the present invention is provided, is also carried to user
More design facilities are supplied.
Voltage LED1 and the LED2 voltage of two articles of lamp bars pass through the 11st resistance R11, the 12nd resistance R12, the tenth respectively
Three resistance R13 and the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23 partial pressures are joined accordingly
Examine voltage（That is LED1A and LED2A voltages）Afterwards, respectively by the 11st diode D11 and the 21st diode D21 export to
Control unit 302, correspondence is taken back after control unit 302 respectively through the 12nd diode D12 and the 22nd diode D22 again
The other end of the output end of partial pressure unit 201, i.e. the 11st resistance R11 other end and the 21st resistance R21, the present invention will
Protection voltage and reference voltage are connected on same point, i.e., it is literary described in LED1A and LED2A, it is being then made up of diode or
Door（That is the 11st diode D11, the 21st diode D21 and the 12nd diode D12, the 22nd diode D22）Electricity
Function is realized on road, simplifies circuit structure, and effectively increase the reliability of power supply.
Further, described control unit 302 includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the first electric capacity C1 and the first triode Q1；One end of the first resistor R1 as control unit 302 input connection the
The negative pole of one diode, the other end connection second resistance R2 of first resistor R1 one end, 3rd resistor R3 one end, the
One electric capacity C1 one end and the first triode Q1 emitter stage；The other end ground connection of the second resistance R2；The 3rd resistor
The R3 other end connects the first electric capacity C1 other end, the 4th resistance R4 one end and the first triode Q1 base stage, and described the
One triode Q1 base stage as described control unit 302 control end；The other end connection the two or two of the 4th resistance R4
The positive pole of pole pipe；The colelctor electrode of the first triode Q1 connects the output unit 303.In the present embodiment, the described 1st
Pole pipe Q1 is PNP type triode.
During specific implementation, through the reference voltage after the partial pressure of partial pressure unit 201, i.e. LED1A and LED2A voltages, pass through respectively
11st diode D11 and the 21st diode D21 are exported to first resistor R1 one end, and first resistor R1 is then passed through again
With the emitter stage that the first triode Q1 is delivered to after second resistance R2 partial pressures, the first triode Q1 base stage passes through the 4th resistance R4
Take back the 11st resistance R11 other end and the 20th respectively through the 12nd diode D12 and the 22nd diode D22 again afterwards
The one resistance R21 other end, the first triode Q1 colelctor electrode connects the power source protective module of rear class by output unit 303
10, wherein, reference voltage LED1A and LED2A voltage are set and determined by first resistor R1 and second resistance R2 partial pressures, herein voltage
Determined the pressure difference of two lamp bars, when LED1A and LED2A voltage by difference be more than first resistor R1 and second resistance R2 partial pressures
When value is more than 1.4V, the first triode Q1 colelctor electrode and emitting stage can be turned on, and then control output unit 303 to turn on, voltage
Exported by output unit 303 to rear class power source protective module 10, so as to can successfully be realized when two-way lamp bar produces voltage difference
Defencive function.Other 3rd resistor R3 and the first electric capacity C1 primarily serves the jamproof effect of voltage regulation filtering, voltage comparison module
30 antijamming capability.
Further, the output unit 303 includes the 5th resistance R5, the 6th resistance R6 and the 3rd diode D3；Institute
The one end for stating the 5th resistance R5 connects the colelctor electrode of the first triode Q1, the other end connection the 3rd of the 5th resistance R5
Diode D3 positive pole, the negative pole of the 3rd diode D3 works as two-way by the 6th resistance R6 connections power source protective module 10
When the voltage difference of lamp bar is more than predetermined threshold value, turn between the first triode Q1 collector and emitters, voltage passes sequentially through the
Five resistance R5, the 3rd diode D3 and the 6th resistance R6 exported to power source protective module 10, i.e. now voltage comparison module 30
Output end UVF exports high level to power source protective module 10, triggers power protection, it is ensured that power supply and whole machine are not damaged.
The present invention correspondingly provides a kind of display device, and it includes protective circuit of switch power source as described above, due to upper
The protective circuit of switch power source is described in detail for text, is not described further herein.
For a better understanding of the present invention, below in conjunction with Fig. 2 to Fig. 4, for concrete application embodiment to opening that the present invention is provided
The protection process of powered-down protection circuit is described in detail：
Voltage LED1 and the LED2 voltage of two articles of lamp bars pass through the 11st resistance R11, the 12nd resistance R12, the 13rd electricity respectively
Resistance R13 and the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23 partial pressures obtain corresponding with reference to electricity
Pressure（That is LED1A and LED2A voltages）Afterwards, exported respectively by the 11st diode D11 and the 21st diode D21 to first
Resistance R1 one end, is then delivered to the first triode Q1 transmitting after first resistor R1 and second resistance R2 partial pressures again
Pole, the first triode Q1 base stage through the 12nd diode D12 and the 22nd diode D22 by dividing again after the 4th resistance R4
The 11st resistance R11 other end and the 21st resistance R21 other end are not taken back, and the first triode Q1 colelctor electrode is successively
Power source protective module 10 is connected to by the 5th resistance R5, the 3rd diode D3 and the 6th resistance R6.Wherein, reference voltage
LED1A and LED2A voltages set the pressure for determining two lamp bars by first resistor R1 and second resistance R2 partial pressures, herein voltage
Difference, when LED1A and LED2A voltage is more than first resistor R1 and second resistance R2 partial pressure values more than 1.4V by difference, the
One triode Q1 colelctor electrode can be turned on emitting stage, and then voltage passes sequentially through the 5th resistance R5, the 3rd diode D3 and
Six resistance R6 are exported to power source protective module 10, i.e., the now output end UVF of voltage comparison module 30 exports high level to power supply
Protection module 10, triggers power protection, so as to avoid power work in abnormal condition, improves the reliability of power supply.
In practical application, such as when EN signals and pwm signal mistake, i.e. EN signals are first received, and main control chip can be examined first
The voltage of each pin of chip is surveyed, now although chip has begun to detect the voltage of each pin, but now LED1 and LED2 voltages
Be 0V, thus will not the work of trigger voltage comparison circuit, and now, because pwm signal is not received also, under-voltage guarantor can be triggered
Shield, the present invention is protected using the voltage difference between lamp bar is detected, and UVP signal, is also come to lamp bar voltage, so that
Successfully avoid the flip chip when EN signals are prior to pwm signal to protect, the problem of causing locked.
Again for example, when two lamp string LED1 or LED2 short circuits or having lamp bead short circuit and LED1 or LED2 output diodes
Short circuit causes correspondence lamp bar when not working, and can all cause the voltage difference between two lamp strings to increase, so that trigger voltage comparison circuit
Work, then trigger protection again, the present invention is by detecting the voltage difference between lamp bar so that power protection, fundamentally solves
Problems, therefore the protective circuit of switch power source that provides of the present invention is when can not only solve EN signals with pwm signal mistake
Locked problem, while power supply is in non-when also solving the problem of power supply short circuit experimental temperature is high and two lamp bar asymmetrical voltages
Normal work area problem, it is to avoid power work improves the reliability of power supply, reduce the failure of whole machine in abnormal condition
Rate.
In summary, in the present invention is provided protective circuit of switch power source and display device, the Switching Power Supply protection electricity
Road includes power source protective module, division module and voltage comparison module；The operating voltage of each lamp bar is carried out by division module
The corresponding reference voltage of each lamp bar is exported after partial pressure to voltage comparison module, the ginseng of each lamp bar is compared by voltage comparison module
Voltage is examined, when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value, voltage comparison module outputs control signals to electricity
Source protection module, controls the power source protective module to open, Switching Power Supply is protected.By the work for detecting each lamp bar
Voltage, startup power supply is protected when the pressure difference of different lamp bars is excessive, it is to avoid power work is solved in abnormal condition, and also
Due to the locked problem of power supply caused by signal error, the reliability of power supply is improved.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (9)
1. a kind of protective circuit of switch power source, including power source protective module, it is characterised in that also including division module and voltage ratio
Compared with module；The corresponding reference voltage of each lamp bar is exported to electricity after carrying out partial pressure to the operating voltage of each lamp bar by division module
Comparison module is pressed, the reference voltage of each lamp bar is compared by voltage comparison module, when the difference of the reference voltage of any two lamp bar is big
When predetermined threshold value, voltage comparison module outputs control signals to power source protective module, controls the power source protective module to open,
Switching Power Supply is protected.
2. protective circuit of switch power source according to claim 1, it is characterised in that the division module include several with
The corresponding partial pressure unit of lamp bar quantity, each partial pressure unit carries out voltage division processing to the operating voltage of connected lamp bar, and
Corresponding reference voltage is exported to voltage comparison module.
3. protective circuit of switch power source according to claim 2, it is characterised in that the voltage comparison module includes logic
Unit, control unit and output unit；Output is extremely controlled after the reference voltage of each lamp bar carries out logical operation through logic unit
Unit, control unit control output unit conducting when the difference of the reference voltage of any two lamp bar is more than predetermined threshold value, output is single
Member outputs control signals to power source protective module, controls the power source protective module to open.
4. protective circuit of switch power source according to claim 2, it is characterised in that each partial pressure unit includes first point
Piezoresistance, the second divider resistance and the 3rd divider resistance, first divider resistance connect the voltage output end of each lamp bar, institute
State the other end connection voltage comparison module of the first divider resistance, also connect the one of the 3rd divider resistance by the second divider resistance
End, the other end ground connection of the 3rd divider resistance.
5. protective circuit of switch power source according to claim 3, it is characterised in that the logic unit include some groups with
The corresponding diode group of lamp bar quantity, every group of diode group includes the first diode and the second diode, the one or two pole
The output end of the negative pole connection correspondence partial pressure unit of the positive pole of pipe and the second diode, the negative pole connection institute of first diode
The input of control unit is stated, the positive pole of second diode connects the control end of described control unit.
6. protective circuit of switch power source according to claim 5, it is characterised in that described control unit includes the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the first electric capacity and the first triode；One end connection first of the first resistor
The negative pole of diode, the other end of the first resistor connects one end, one end of 3rd resistor, the first electric capacity of second resistance
One end and the emitter stage of the first triode；The other end ground connection of the second resistance；The other end connection the of the 3rd resistor
The base stage of the other end of one electric capacity, one end of the 4th resistance and the first triode；The other end connection second of 4th resistance
The positive pole of diode；The colelctor electrode of first triode connects the output unit.
7. protective circuit of switch power source according to claim 6, it is characterised in that the output unit includes the 5th electricity
Resistance, the 6th resistance and the 3rd diode；One end of 5th resistance connects the colelctor electrode of first triode, the described 5th
The other end of resistance connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects power protection by the 6th resistance
Module.
8. protective circuit of switch power source according to claim 6, it is characterised in that first triode is positive-negative-positive three
Pole pipe.
9. a kind of display device, it is characterised in that protect electricity including the Switching Power Supply as described in claim 1-8 any one
Road.
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| CN201710243860.1A CN106953300B (en) | 2017-04-14 | 2017-04-14 | A kind of protective circuit of switch power source and display equipment |
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| CN201710243860.1A CN106953300B (en) | 2017-04-14 | 2017-04-14 | A kind of protective circuit of switch power source and display equipment |
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| CN106953300B CN106953300B (en) | 2019-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110231560A (en) * | 2018-03-06 | 2019-09-13 | 欧姆龙汽车电子株式会社 | Inductive load controls equipment |
| CN110730542A (en) * | 2019-10-12 | 2020-01-24 | 深圳创维－Rgb电子有限公司 | LED light bar network protection circuit, driving power supply and television |
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| CN106953300B (en) | 2019-04-16 |
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