CN106026009A - Overcurrent protection circuit for power manager, and display panel equipped with overcurrent protection circuit - Google Patents
Overcurrent protection circuit for power manager, and display panel equipped with overcurrent protection circuit Download PDFInfo
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- CN106026009A CN106026009A CN201610345001.9A CN201610345001A CN106026009A CN 106026009 A CN106026009 A CN 106026009A CN 201610345001 A CN201610345001 A CN 201610345001A CN 106026009 A CN106026009 A CN 106026009A
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- Prior art keywords
- circuit
- subtractor
- voltage
- outfan
- current foldback
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention provides an overcurrent protection circuit for a power manager, and a display panel equipped with the overcurrent protection circuit. The overcurrent protection circuit comprises a first detecting circuit and a first switching circuit, wherein an output control end is used for being connected with the power manager; the first detecting circuit comprises a first subtractor and a first comparator; a positive phase input end of the first subtractor is connected with an inverted phase input end of the first subtractor through a first resistor; the positive phase input end of the first subtractor is used for receiving a first voltage; the voltage at an output end of the first subtractor is in proportional relation with the voltage difference between the two input ends of the first subtractor; and the first comparator is used for outputting a first high level signal to switch on the first switching circuit after the voltage at the output end of the first subtractor is higher than a first reference voltage through comparison so as to enable a power supply control end to be grounded to output a first low level signal to the power manager in order to enable the power manager to stop the power supply. By adoption of the overcurrent protection circuit, whether the current of the output voltage is overhigh or not can be detected, so that damage caused by short circuit can be effectively avoided.
Description
Technical field
The present invention relates to current foldback circuit, particularly relate to current foldback circuit and the tool of a kind of power supervisor
There is the display floater of this protection circuit.
Background technology
Liquid crystal panel is little because of its volume, lightweight, and display quality is superior and very popular.Liquid crystal surface
Plate.But in use, the frame portion of liquid crystal panel speckles with dust and may cause in liquid crystal panel
Circuit board short circuit.
It is all the change in voltage of detecting power supervisor output at present for short circuit problem in panel, works as magnitude of voltage
Step-down or Gao Shicai can protect, and can't detect its electric current, within frame foreign body etc. causes panel
When short circuit occurs, this problem can not be found in real time, if panel works may result in molten screen, on fire etc. always
The appearance of problem.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention provides current foldback circuit and the tool of a kind of power supervisor
There is the display floater of this protection circuit.
The present invention provides the current foldback circuit of a kind of power supervisor, described current foldback circuit to include first
Circuit for detecting and the first on-off circuit, one end ground connection of described first on-off circuit, described first on-off circuit
The other end connect output control terminal, described output control terminal is used for connecting described power supervisor, described the
One circuit for detecting includes that the first subtractor and the first comparator, the normal phase input end of described first subtractor pass through
First resistance connects the inverting input of described first subtractor, and the normal phase input end of described first subtractor is used
In receiving the first voltage, the voltage of the outfan of described first subtractor is defeated with the positive of described first subtractor
Entering to hold relation proportional to the voltage difference between inverting input, described first comparator is for the most described
The voltage of the outfan of the first subtractor is more than exporting the first high level signal after the first reference voltage to described the
One on-off circuit, described first on-off circuit turns on after receiving described first high level signal and makes described power supply
Control end ground connection and export the first low level signal to described power supervisor, so that described power supervisor
Stop power supply.
Further, described current foldback circuit also includes the second circuit for detecting and second switch circuit, described
One end ground connection of second switch circuit, the other end of described second switch circuit connects described output control terminal,
Described second circuit for detecting includes the second subtractor and the second comparator, the positive input of described second subtractor
Holding the inverting input being connected described second subtractor by the second resistance, the positive of described second subtractor is defeated
Enter to hold for receiving the second voltage, the voltage of the outfan of described second subtractor and described second subtractor
The proportional relation of voltage difference between normal phase input end to inverting input, described comparator is for comparing
State the voltage of outfan of the second subtractor more than exporting the second high level signal after the second reference voltage to described
Second switch circuit, described second switch circuit turns on after receiving described second high level signal and makes described electricity
Source controls end ground connection and exports the second low level signal to described power supervisor, so that described power management
Device is stopped power supply.
Further, described current foldback circuit also includes the 3rd circuit for detecting and the 3rd on-off circuit, described
One end ground connection of the 3rd on-off circuit, the other end of described 3rd on-off circuit connects described output control terminal,
Described 3rd circuit for detecting includes the 3rd subtractor and the 3rd comparator, the positive input of described 3rd subtractor
Holding the inverting input being connected described 3rd subtractor by the 3rd resistance, the positive of described 3rd subtractor is defeated
Enter to hold for receiving tertiary voltage, the voltage of the outfan of described second subtractor and described 3rd subtractor
The proportional relation of voltage difference between normal phase input end to inverting input, described comparator is for comparing
State the voltage of outfan of the 3rd subtractor more than exporting the 3rd high level signal after the 3rd reference voltage to described
3rd on-off circuit, described 3rd on-off circuit turns on after receiving described 3rd high level signal and makes described electricity
Source controls end ground connection and exports the 3rd low level signal to described power supervisor, so that described power management
Device is stopped power supply.
Further, described power control terminal connects power supply by connecting resistance.
Further, described first on-off circuit includes that the first transistor, described the first transistor include conducting
End, input and outfan, described conduction terminal connects the outfan of described first comparator, and described first is brilliant
The input of body pipe connects described output control terminal, the output head grounding of described the first transistor.
Further, the normal phase input end of described first subtractor passes through capacity earth.
Further, the inverting input of described first subtractor passes through capacity earth.
Further, the outfan of described first subtractor passes through capacity earth.
Further, described first reference voltage is formed by divider resistance dividing potential drop by output voltage.
The present invention also provides for a kind of display floater, and described display floater includes above-mentioned current foldback circuit.
Beneficial effects of the present invention: the current foldback circuit of described power supervisor includes subtractor, comparator
And on-off circuit, connect resistance, the voltage of subtractor output and subtractor between two inputs of subtractor
The proportional relation of voltage difference of two inputs, namely with flow through the current in proportion relation of resistance, comparator
Compare the voltage of subtractor output and the size of reference voltage, to control the break-make of on-off circuit, so that defeated
Go out voltage end and feed back signal to power supervisor so that whether power supervisor stops power supply, be prevented effectively from because of
The infringement that short circuit causes.
Accompanying drawing explanation
Fig. 1 be current foldback circuit better embodiment and the power supervisor of power supervisor of the present invention be
System block diagram.
Fig. 2 is the circuit connection diagram of the current foldback circuit better embodiment of power supervisor of the present invention.
Detailed description of the invention
Below, in conjunction with accompanying drawing, various embodiments of the present invention will be described in detail.
Referring to Fig. 1, the current foldback circuit better embodiment of power supervisor of the present invention includes the first detecting
Circuit the 11, first on-off circuit the 21, second circuit for detecting 12, second switch circuit the 22, the 3rd detecting electricity
Road 13 and the 3rd on-off circuit 23.Described first circuit for detecting 11 connects described first on-off circuit 21, institute
Stating the second circuit for detecting 12 and connect described second switch circuit 22, described 3rd circuit for detecting 13 connects described
3rd on-off circuit 23.Described first on-off circuit 21, described second switch circuit 22, described 3rd switch
Circuit 23 is all connected with output control terminal Vout.Described output control terminal Vout connects power supply electricity by resistance R8
Source, in the present embodiment, described power supply is 3.3V.Described output control terminal Vout connects power management
Device 30.
Referring to Fig. 2, described first circuit for detecting 11 includes subtractor 111 and the first comparator COMP1.
Described subtractor 111 includes the first operational amplifier OP1, and the homophase of described first operational amplifier OP1 is defeated
Entering end and connect the first voltage input end by resistance R2, described first voltage input end passes through electric capacity C2 ground connection.
Described first voltage input end is used for receiving voltage VGHF (being exported by power supervisor 30), described computing
The in-phase input end of amplifier OP1 is also by resistance R3 ground connection.Described first voltage input end passes through resistance
R5 connects the first voltage-contrast end, and the voltage of described first voltage-contrast end is VGH, described first voltage pair
Than end by electric capacity C1 ground connection.Described first voltage input end and described first voltage-contrast end are respectively as subtracting
The normal phase input end of musical instruments used in a Buddhist or Taoist mass 111 and inverting input.Described first voltage-contrast end connects institute by resistance R1
State the inverting input of the first operational amplifier OP1, the inverting input of described first operational amplifier OP1
The outfan of described first operational amplifier OP1, described first operational amplifier OP1 is connected by resistance R4
Outfan by electric capacity C3 ground connection.The outfan of described first operational amplifier OP1 is also connected with described
The normal phase input end of one comparator COMP1, the inverting input of described first comparator COMP1 connects ginseng
Examine voltage.In the present embodiment, described reference voltage is that supply voltage 3.3V is by divider resistance R6, R7
Dividing potential drop form.The inverting input of described first comparator COMP1 is also by resistance R7 ground connection.At this
In embodiment, the value relatable of described resistance R1, R2, R3, R4 meets: R4/R1=R3/R2, ratio
It is a constant, the electricity that described first subtractor 111 (outfan of the i.e. first operational amplifier OP1) exports
Pressure is: Vo=R4/R1 (VGHF-VGH).
Described first on-off circuit include the first transistor Q1, described the first transistor Q1 include conduction terminal,
Input, outfan, the conduction terminal of described the first transistor Q1 connects described first comparator COMP1's
Outfan, the input of described the first transistor Q1 connects described output control terminal Vout, described first crystal
The output head grounding of pipe Q1.
Referring to Fig. 2, described second circuit for detecting 12 includes subtractor 121 and the second comparator COMP2.
Described subtractor 121 includes the second operational amplifier OP2, and the homophase of described second operational amplifier OP2 is defeated
Entering end and connect the second voltage input end by resistance R10, described second voltage input end passes through electric capacity C5 ground connection.
Described second voltage input end is used for receiving voltage VGLF (being exported by power supervisor 30), described second fortune
Calculate the in-phase input end of amplifier OP2 also by resistance R11 ground connection.Described second voltage input end is by electricity
Resistance R9 connects the second voltage-contrast end, and the voltage of described second voltage-contrast end is VGL, described second electricity
Pressure contrast end is by electric capacity C4 ground connection.Described second voltage input end and described second voltage-contrast end are made respectively
Normal phase input end and inverting input for subtractor 121.Described second voltage-contrast end passes through resistance R12
Connecting the inverting input of described second operational amplifier OP2, described second operational amplifier OP2's is anti-phase
Input connects the outfan of described second operational amplifier OP2 by resistance R13, and described second computing is put
The outfan of big device OP2 is by electric capacity C6 ground connection.The outfan of described second operational amplifier OP2 also connects
Connect the normal phase input end of described second comparator COMP2, the anti-phase input of described second comparator COMP2
End connects reference voltage.In the present embodiment, described reference voltage is that supply voltage 3.3V passes through divider resistance
The dividing potential drop of R14, R15 forms.The inverting input of described second comparator COMP2 is also by resistance R15
Ground connection.In the present embodiment, the value relatable of described resistance R12, R13, R10, R11 meets:
R13/R12=R11/R10, ratio is a constant, described second subtractor 121 (the i.e. second operational amplifier
The outfan of OP2) voltage that exports is: Vo=R13/R12 (VGLF-VGL).
Described second switch circuit include transistor seconds Q2, described transistor seconds Q2 include conduction terminal,
Input, outfan, the conduction terminal of described transistor seconds Q2 connects described second comparator COMP2's
Outfan, the input of described transistor seconds Q2 connects described output control terminal Vout, described second crystal
The output head grounding of pipe Q2.
Referring to Fig. 2, described 3rd circuit for detecting 13 includes subtractor 131 and the 3rd comparator COMP3.
Described subtractor 131 includes the 3rd operational amplifier OP3, and the homophase of described 3rd operational amplifier OP3 is defeated
Entering end and connect tertiary voltage input by resistance R19, described tertiary voltage input passes through electric capacity C8 ground connection.
Described tertiary voltage input is used for receiving voltage VCOMF (being exported by power supervisor 30), and the described 3rd
The in-phase input end of operational amplifier OP3 is also by resistance R20 ground connection.Described tertiary voltage input passes through
Resistance R16 connects tertiary voltage contrast end, and the voltage of described tertiary voltage contrast end is VCOM, and described the
Three voltage-contrast ends pass through electric capacity C7 ground connection.Described tertiary voltage input and described tertiary voltage contrast end divide
Not as normal phase input end and the inverting input of subtractor 131.Described tertiary voltage contrast end passes through resistance
R17 connects the inverting input of described 3rd operational amplifier OP3, described 3rd operational amplifier OP3's
Inverting input connects the outfan of described 3rd operational amplifier OP3, described 3rd fortune by resistance R13
Calculate the outfan of amplifier OP3 by electric capacity C9 ground connection.The outfan of described 3rd operational amplifier OP3
Being also connected with the normal phase input end of described 3rd comparator COMP2, described 3rd comparator COMP2's is anti-phase
Input connects reference voltage.In the present embodiment, described reference voltage is that supply voltage 3.3V passes through dividing potential drop
The dividing potential drop of resistance R21, R22 forms.The inverting input of described 3rd comparator COMP2 is also by resistance
R22 ground connection.In the present embodiment, the value relatable of described resistance R17, R18, R19, R20 meets:
R18/R17=R20/R19, ratio is a constant.
Described 3rd on-off circuit include third transistor Q3, described third transistor Q3 include conduction terminal,
Input, outfan, the conduction terminal of described third transistor Q3 connects described 3rd comparator COMP2's
Outfan, the input of described third transistor Q3 connects described output control terminal Vout, described 3rd crystal
The output head grounding of pipe Q3.In the present embodiment, described the first transistor Q1, described the first transistor Q2,
Described third transistor Q3 is field effect transistor, the conduction terminal of described three three transistors, input, output
End is respectively grid, drain electrode, source electrode.
In use, can be detected them by the pressure reduction between detecting voltage input end and voltage-contrast end
Between current value.Such as, as power supervisor output VGHF, the voltage of the first voltage-contrast end is
VGH, the electric current I flowing through R5 be: (VGHF-VGH)/R5.The voltage of the first subtractor output is:
Vo=R4/R1 (VGHF-VGH), the inverting input of described first comparator COMP1 when voltage is
3.3*R7/ (R6+R7), as described V0 > 3.3*R7/ (R6+R7), the electric current i.e. representing VGHF output is excessive,
Described first comparator COMP1 exports high level and makes the first transistor Q1 turn on, so that Vout is defeated
Go out low level signal.Power supervisor stops output voltage after receiving low level signal, thus plays protection
The effect of display floater.
Other two circuit for detecting principles are identical, all can make as long as arbitrary circuit for detecting detects over-current phenomenon avoidance
Vout output low level signal.
Although illustrate and describing the present invention with reference to specific embodiment, but those skilled in the art will
Understand: in the case of without departing from the spirit and scope of the present invention limited by claim and equivalent thereof,
The various changes in form and details can be carried out at this.
Claims (10)
1. the current foldback circuit of a power supervisor, it is characterised in that described current foldback circuit includes
First circuit for detecting and the first on-off circuit, one end ground connection of described first on-off circuit, described first switch
The other end of circuit connects output control terminal, and described output control terminal is used for connecting described power supervisor, institute
State the first circuit for detecting and include the first subtractor and the first comparator, the normal phase input end of described first subtractor
The inverting input of described first subtractor is connected, the positive input of described first subtractor by the first resistance
End is for receiving the first voltage, and the voltage of the outfan of described first subtractor is with described first subtractor just
The proportional relation of voltage difference between phase input and inverting input, described first comparator is for comparing
The voltage of the outfan of described first subtractor exports the first high level signal to institute more than after the first reference voltage
State the first on-off circuit, described first on-off circuit turn on after receiving described first high level signal make described
Power control terminal ground connection and export the first low level signal to described power supervisor, so that described power supply pipe
Reason device is stopped power supply.
Current foldback circuit the most according to claim 1, it is characterised in that described current foldback circuit
Also include the second circuit for detecting and second switch circuit, one end ground connection of described second switch circuit, described
The other end of two on-off circuits connects described output control terminal, and described second circuit for detecting includes the second subtractor
And second comparator, the normal phase input end of described second subtractor connects described second subtraction by the second resistance
The inverting input of device, the normal phase input end of described second subtractor for receive the second voltage, described second
Electricity between voltage and normal phase input end and the inverting input of described second subtractor of the outfan of subtractor
The proportional relation of pressure reduction, described comparator is more than for the voltage of the outfan at more described second subtractor
The second high level signal be exported to described second switch circuit, described second switch circuit after second reference voltage
After receiving described second high level signal, conducting makes described power control terminal ground connection export the second low level letter
Number give described power supervisor so that described power supervisor is stopped power supply.
Current foldback circuit the most according to claim 2, it is characterised in that described current foldback circuit
Also include the 3rd circuit for detecting and the 3rd on-off circuit, one end ground connection of described 3rd on-off circuit, described
The other end of three on-off circuits connects described output control terminal, and described 3rd circuit for detecting includes the 3rd subtractor
And the 3rd comparator, the normal phase input end of described 3rd subtractor connects described 3rd subtraction by the 3rd resistance
The inverting input of device, the normal phase input end of described 3rd subtractor is used for receiving tertiary voltage, and described second
Electricity between voltage and normal phase input end and the inverting input of described 3rd subtractor of the outfan of subtractor
The proportional relation of pressure reduction, described comparator is more than for the voltage of the outfan at more described 3rd subtractor
The 3rd high level signal be exported to described 3rd on-off circuit, described 3rd on-off circuit after 3rd reference voltage
After receiving described 3rd high level signal, conducting makes described power control terminal ground connection export the 3rd low level letter
Number give described power supervisor so that described power supervisor is stopped power supply.
Current foldback circuit the most according to claim 1, it is characterised in that described power control terminal leads to
Cross connection resistance and connect power supply.
Current foldback circuit the most according to claim 1, it is characterised in that described first on-off circuit
Including the first transistor, described the first transistor includes conduction terminal, input and outfan, described conduction terminal
Connecting the outfan of described first comparator, the input of described the first transistor connects described output control terminal,
The output head grounding of described the first transistor.
Current foldback circuit the most according to claim 1, it is characterised in that described first subtractor
Normal phase input end passes through capacity earth.
Current foldback circuit the most according to claim 1, it is characterised in that described first subtractor
Inverting input passes through capacity earth.
Current foldback circuit the most according to claim 1, it is characterised in that described first subtractor
Outfan passes through capacity earth.
Current foldback circuit the most according to claim 1, it is characterised in that described first reference voltage
Formed by divider resistance dividing potential drop by output voltage.
10. a display floater, it is characterised in that described display floater includes claim 1 to 9 times
The current foldback circuit of one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345001.9A CN106026009A (en) | 2016-05-23 | 2016-05-23 | Overcurrent protection circuit for power manager, and display panel equipped with overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345001.9A CN106026009A (en) | 2016-05-23 | 2016-05-23 | Overcurrent protection circuit for power manager, and display panel equipped with overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106026009A true CN106026009A (en) | 2016-10-12 |
Family
ID=57096175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610345001.9A Pending CN106026009A (en) | 2016-05-23 | 2016-05-23 | Overcurrent protection circuit for power manager, and display panel equipped with overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106026009A (en) |
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| CN107886883A (en) * | 2017-12-05 | 2018-04-06 | 深圳市华星光电技术有限公司 | A kind of circuit and method for detecting the short circuit of public electrode cabling |
| CN107909972A (en) * | 2017-11-15 | 2018-04-13 | 深圳市华星光电技术有限公司 | Current foldback circuit and method |
| CN109617224A (en) * | 2018-12-04 | 2019-04-12 | 中车大连机车研究所有限公司 | A kind of train intelligent control system redundant power |
| CN110427091A (en) * | 2019-07-19 | 2019-11-08 | 昆山龙腾光电有限公司 | Power supply circuit and display device |
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107909972A (en) * | 2017-11-15 | 2018-04-13 | 深圳市华星光电技术有限公司 | Current foldback circuit and method |
| CN107886883A (en) * | 2017-12-05 | 2018-04-06 | 深圳市华星光电技术有限公司 | A kind of circuit and method for detecting the short circuit of public electrode cabling |
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| CN109617224B (en) * | 2018-12-04 | 2022-04-26 | 中车大连机车研究所有限公司 | Redundant power supply of train intelligent control system |
| CN110427091A (en) * | 2019-07-19 | 2019-11-08 | 昆山龙腾光电有限公司 | Power supply circuit and display device |
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
| CN113419592B (en) * | 2021-06-25 | 2023-02-28 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161012 |
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| RJ01 | Rejection of invention patent application after publication |