CN208767784U - Quick discharging circuit - Google Patents
Quick discharging circuit Download PDFInfo
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- CN208767784U CN208767784U CN201821392191.0U CN201821392191U CN208767784U CN 208767784 U CN208767784 U CN 208767784U CN 201821392191 U CN201821392191 U CN 201821392191U CN 208767784 U CN208767784 U CN 208767784U
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Abstract
A kind of quick discharging circuit includes control unit, driving unit, switch unit and discharge cell.The quick discharging circuit of the utility model passes through setting control unit, driving unit, switch unit and discharge cell.When user powers off LED display, control unit exports the level output end of low level signal to driving unit by level output end, driving unit does not work, since the level of the second electrical level input terminal of the level and discharge cell of the level input of switch unit is persistently drawn high by the input voltage of external power supply, so that switch unit does not work and discharge cell work, discharge cell discharges rapidly the power supply of the power end of TCON plate into ground, the power-off rate for substantially increasing LED display is effectively prevented the wrong problem of the electrifying timing sequence of next LED display.
Description
Technical field
The utility model relates to technical field of LED display, more particularly to a kind of quick discharging circuit.
Background technique
Currently, LED display is a kind of flat-panel monitor, it is made of LED module panel small one by one, for showing text
The equipment of the various information such as word, image, video, video signal.The luminescent color and luminous efficiency of LED and the material of production LED
Related with technique, lamp ball has just started to be blue light entirely, behind adjusted out not according to the different needs of user along with fluorescent powder
Same is photochromic, widely used to have red, green, blue, Huang Si kind.Since LED operation voltage is low, it can actively shine and have certain bright
Degree, brightness can use voltage or current regulation again, and impact resistance, anti-vibration, service life are long again in itself, so in large-scale display equipment
In, it there is no other display modes to be equal to LED display mode.Why in widespread attention LED is and is rapidly developed, and is
It is inseparable with advantage possessed by itself.These advantages sum up: brightness is high, operating voltage is low, small power consumption, large size
Change, the service life is long, impact resistance and performance are stablized.The development prospect of LED is extremely wide, just towards more high brightness, more high weather resistance,
Higher luminous density, higher uniformity of luminance, reliability, panchromaticization direction are developed.Various fields are widely applied in LED display
It closes, for example, gymnasium, market and hotel etc..
In the actual application of LED display, it can be provided with TCON plate inside LED display, when LED display screen
When starting work, for TCON plate output voltage into LED display, LED display receives voltage starting work；Work as LED display
When not working, into LED display, LED display can not work output voltage TCON plate because not receiving voltage.Due to
LED display is electronic component, it is contemplated that the voltage stability of LED display screen, designer can set in LED display
It is equipped with the filter capacitor of multiple large capacities, stablizes the voltage of LED display with this, but the filter capacitor of large capacity can have one
A little problems, capacitor be energy storage component, when LED display power-off when, that is, TCON plate not output voltage into LED display,
The presence of large bulk capacitance can slow down the power-off speed of LED display, complete user again again if not powering off in LED display
When secondary starting LED display, just easily cause LED display electrifying timing sequence wrong, LED display is caused not start normally.
Utility model content
The purpose of the utility model is to overcome shortcomings in the prior art, and providing one kind quickly can allow LED to show
Quick discharging circuit that is screen power-off and effectivelying prevent LED display electrifying timing sequence wrong.
The purpose of this utility model is achieved through the following technical solutions:
A kind of quick discharging circuit, comprising:
Control unit；
Driving unit, the level input of the driving unit and the level output end of described control unit connect, described
The ground terminal of driving unit is grounded；
The power input of switch unit, the switch unit is connect with external power supply, and the level of the switch unit is defeated
Enter end to connect with the level output end of the driving unit；And
Discharge cell, the first level input of the discharge cell respectively with the level output end of the switch unit and
The power end of TCON plate connects, the second electrical level input terminal of the discharge cell level output end with the driving unit respectively
It is connected with the level input of the switch unit, the ground terminal ground connection of the discharge cell.
In a wherein embodiment, the driving unit includes first switch tube and first resistor, and described first opens
It is defeated as the level input of the driving unit and the level of described control unit to close first resistor described in the base series of pipe
Outlet connection, the collector of the first switch tube as the driving unit level output end respectively with the switch unit
Level input connected with the second electrical level input terminal of the discharge cell, described in the emitter of the first switch tube is used as
The ground terminal of driving unit is grounded.
In a wherein embodiment, the driving unit further includes first capacitor, the first end of the first capacitor
It is connect with the first end of the first resistor, the second end ground connection of the first capacitor.
In a wherein embodiment, the driving unit further includes second resistance, the first end of the second resistance
It is connect with the base stage of the first switch tube, the second end of the second resistance is connect with the second end of the first capacitor.
In a wherein embodiment, the switch unit includes second switch and the second capacitor, and described second opens
The source electrode for closing pipe is connect as the power input of the switch unit with external power supply, the grid conduct of the second switch
The level input of the switch unit is electric with the second of the level output end of the driving unit and the discharge cell respectively
Flat input terminal connection, level output end and the discharge cell of the drain electrode of the second switch as the switch unit
The connection of first level input, the first end of second capacitor are connect with the source electrode of the second switch, second electricity
The second end of appearance is grounded.
In a wherein embodiment, the switch unit further includes 3rd resistor, the first end of the 3rd resistor
It is connect with the source electrode of the second switch, the second end of the 3rd resistor is connect with the grid of the second switch.
In a wherein embodiment, the discharge cell includes third switching tube and the 4th resistance, and the third is opened
Close pipe drain series described in the 4th resistance as the discharge cell the first level input respectively with the switch unit
Level output end connected with the power end of TCON plate, the second electricity of the grid of the third switching tube as the discharge cell
Flat input terminal is connect with the level input of the level output end of driving unit and the switch unit respectively, the third switch
The source electrode of pipe is grounded as the ground terminal of the discharge cell.
In a wherein embodiment, the discharge cell further includes the first polar capacitor, first polar capacitor
Anode connect with the first end of the 4th resistance, the source electrode of the cathode of first polar capacitor and the third switching tube
Connection.
In a wherein embodiment, the discharge cell further includes third capacitor, the first end of the third capacitor
It is connect with the anode of first polar capacitor, the cathode of the second end of the third capacitor and first polar capacitor connects
It connects.
Compared with prior art, the utility model at least has the following advantages:
The quick discharging circuit of the utility model, it is single by setting control unit, driving unit, switch unit and electric discharge
Member.When user powers off LED display, control unit exports the electricity of low level signal to driving unit by level output end
Flat output end, driving unit do not work, since the level of the level input of switch unit and the second electrical level of discharge cell are defeated
The level for entering end is persistently drawn high by the input voltage of external power supply, so that switch unit does not work and discharge cell work, electric discharge
Unit discharges rapidly the power supply of the power end of TCON plate into ground, substantially increases the power-off rate of LED display, effectively
The problem for preventing the electrifying timing sequence of next LED display wrong.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the quick discharging circuit in one embodiment of the utility model.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Referring to Fig. 1, quick discharging circuit 10 includes that control unit, driving unit 100, switch unit 200 and electric discharge are single
Member 300；The level input of the driving unit 100 and the level output end of described control unit connect, the driving unit
100 ground terminal ground connection；The power input of the switch unit 200 is connect with external power supply, the electricity of the switch unit 200
Flat input terminal is connect with the level output end of the driving unit 100；First level input of the discharge cell 300 is distinguished
It is connect with the power end of the level output end of the switch unit 200 and TCON plate, the second electrical level of the discharge cell 300 is defeated
Enter end to connect with the level input of the level output end of the driving unit 100 and the switch unit 200 respectively, it is described to put
The ground terminal of electric unit 300 is grounded.In this way, control unit is exported by level output end when user powers off LED display
Low level signal is to the level output end of driving unit 100, and driving unit 100 does not work, since the level of switch unit 200 is defeated
The level for entering the level at end and the second electrical level input terminal of discharge cell 300 is persistently drawn high by the input voltage of external power supply, is made
It obtains switch unit 200 not work and the work of discharge cell 300, discharge cell 300 releases rapidly the power supply of the power end of TCON plate
It puts into ground, substantially increases the power-off rate of LED display, the electrifying timing sequence for being effectively prevented next LED display is wrong
The problem of.
Further, referring to Fig. 1, in one embodiment, the driving unit 100 includes first switch tube Q1
With first resistor R1, electricity of the first resistor R1 as the driving unit 100 described in the base series of the first switch tube Q1
Flat input terminal and the level output end of described control unit connect, and the collector of the first switch tube Q1 is single as the driving
The level output end of member 100 is electric with the second of the level input of the switch unit 200 and the discharge cell 300 respectively
The emitter of flat input terminal connection, the first switch tube Q1 is grounded as the ground terminal of the driving unit 100.
Further, referring to Fig. 1, in one embodiment, the driving unit 100 further includes first capacitor
C1, the first end of the first capacitor C1 are connect with the first end of the first resistor R1, the second end of the first capacitor C1
Ground connection.
Further, referring to Fig. 1, in one embodiment, the driving unit 100 further includes second resistance
R2, the first end of the second resistance R2 are connect with the base stage of the first switch tube Q1, the second end of the second resistance R2
It is connect with the second end of the first capacitor C1.
Further, referring to Fig. 1, in one embodiment, the switch unit 200 includes second switch Q2
Power input and external power supply with the source electrode of the second capacitor C2, the second switch Q2 as the switch unit 200
Connection, the grid of the second switch Q2 as the switch unit 200 level input respectively with the driving unit
100 level output end is connected with the second electrical level input terminal of the discharge cell 300, and the drain electrode of the second switch Q2 is made
It is connect for the level output end of the switch unit 200 with the first level input of the discharge cell 300, second electricity
The first end for holding C2 is connect with the source electrode of the second switch Q2, the second end ground connection of the second capacitor C2.
Further, referring to Fig. 1, in one embodiment, the switch unit 200 further includes 3rd resistor
R3, the first end of the 3rd resistor R3 are connect with the source electrode of the second switch Q2, the second end of the 3rd resistor R3
It is connect with the grid of the second switch Q2.
Further, referring to Fig. 1, in one embodiment, the discharge cell 300 includes third switching tube Q3
With the 4th resistance R4, the 4th resistance R4 described in the drain series of the third switching tube Q3 as the discharge cell 300
One level input is connect with the power end of the level output end of the switch unit 200 and TCON plate respectively, and the third is opened
Close second electrical level input terminal respectively level output end with driving unit 100 of the grid as the discharge cell 300 of pipe Q3
It is connected with the level input of the switch unit 200, the source electrode of the third switching tube Q3 is as the discharge cell 300
Ground terminal ground connection.
Further, referring to Fig. 1, in one embodiment, the discharge cell 300 further includes the first polarity electricity
Hold K1, the anode of the first polar capacitor K1 is connect with the first end of the 4th resistance, the first polar capacitor K1's
Cathode is connect with the source electrode of the third switching tube Q3.
Further, referring to Fig. 1, in one embodiment, the discharge cell 300 further includes third capacitor
C3, the first end of the third capacitor C3 are connect with the anode of the first polar capacitor K1, and the second of the third capacitor C3
End is connect with the cathode of the first polar capacitor K1.
The concrete operating principle of quick discharging circuit is described in detail below:
When user carries out power operation to LED display, control unit is by level output end output low level, to the
The base stage input low level signal of one switching tube Q1, at this point, first switch tube Q1 ends.Due to second switch Q2 grid and
The grid of third switching tube Q3 is persistently drawn high by the voltage of external power supply, along with second switch Q2 and third switching tube Q3 are
Complementary switch pipe, that is, when second switch Q2 conducting, third switching tube Q3 cut-off；When second switch Q2 cut-off, the
Three switching tube Q3 conducting.When the grid of second switch Q2 and the grid of third switching tube Q3 are persistently drawn by the voltage of external power supply
Gao Shi, second switch Q2 cut-off, third switching tube Q3 conducting, at this point, the voltage at TCON on board supply end is switched due to third
The conducting of pipe Q3 and be discharged to rapidly in ground, fast break operation is realized to LED display, effectively next user is to LED
The wrong problem of the electrifying timing sequence of display screen.
It should be noted that first resistor R1 plays the role of current limliting, first switch tube Q1 is protected；First capacitor C1 is played
The effect of filtering, filtering clutter；Second resistance R2 plays the role of partial pressure；Second capacitor C2 plays the role of filtering；Third electricity
Resistance R3 plays the role of partial pressure and current limliting, protects second switch Q2.
It should also be noted that, the first polar capacitor K1 and third capacitor C3 play the role of filtering, the first polarity electricity
Hold K1 and filters out the high frequency spurs on TCON plate power end, and third capacitor C3 filters out the low frequency spur on TCON plate power end.The
One polar capacitor K1 and third capacitor C3 play the role of double-smoothing.
The quick discharging circuit of the utility model, it is single by setting control unit, driving unit, switch unit and electric discharge
Member.When user powers off LED display, control unit exports the electricity of low level signal to driving unit by level output end
Flat output end, driving unit do not work, since the level of the level input of switch unit and the second electrical level of discharge cell are defeated
The level for entering end is persistently drawn high by the input voltage of external power supply, so that switch unit does not work and discharge cell work, electric discharge
Unit discharges rapidly the power supply of the power end of TCON plate into ground, substantially increases the power-off rate of LED display, effectively
The problem for preventing the electrifying timing sequence of next LED display wrong.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (9)
1. a kind of quick discharging circuit characterized by comprising
Control unit；
Driving unit, the level input of the driving unit and the level output end of described control unit connect, the driving
The ground terminal of unit is grounded；
The power input of switch unit, the switch unit is connect with external power supply, the level input of the switch unit
It is connect with the level output end of the driving unit；And
Discharge cell, the first level input of the discharge cell respectively with the level output end and TCON of the switch unit
The power end of plate connects, the second electrical level input terminal of the discharge cell respectively with the level output end of the driving unit and institute
State the level input connection of switch unit, the ground terminal ground connection of the discharge cell.
2. quick discharging circuit according to claim 1, which is characterized in that the driving unit include first switch tube and
First resistor, level input and institute of the first resistor as the driving unit described in the base series of the first switch tube
State the level output end connection of control unit, level output end of the collector of the first switch tube as the driving unit
It is connect respectively with the second electrical level input terminal of the level input of the switch unit and the discharge cell, the first switch
The emitter of pipe is grounded as the ground terminal of the driving unit.
3. quick discharging circuit according to claim 2, which is characterized in that the driving unit further includes first capacitor,
The first end of the first capacitor is connect with the first end of the first resistor, the second end ground connection of the first capacitor.
4. quick discharging circuit according to claim 3, which is characterized in that the driving unit further includes second resistance,
The first end of the second resistance is connect with the base stage of the first switch tube, the second end of the second resistance and described first
The second end of capacitor connects.
5. quick discharging circuit according to claim 1, which is characterized in that the switch unit include second switch and
The source electrode of second capacitor, the second switch is connect as the power input of the switch unit with external power supply, described
The grid of second switch as the switch unit level input respectively with the level output end of the driving unit and
The second electrical level input terminal of the discharge cell connects, and the drain electrode of the second switch is defeated as the level of the switch unit
Outlet is connect with the first level input of the discharge cell, first end and the second switch of second capacitor
Source electrode connection, the second end ground connection of second capacitor.
6. quick discharging circuit according to claim 5, which is characterized in that the switch unit further includes 3rd resistor,
The first end of the 3rd resistor is connect with the source electrode of the second switch, the second end of the 3rd resistor and described second
The grid of switching tube connects.
7. quick discharging circuit according to claim 1, which is characterized in that the discharge cell include third switching tube and
4th resistance, first level input of the 4th resistance as the discharge cell described in the drain series of the third switching tube
It is connect respectively with the power end of the level output end of the switch unit and TCON plate, the grid of the third switching tube is as institute
The second electrical level input terminal for stating discharge cell is inputted with the level of the level output end of driving unit and the switch unit respectively
The source electrode of end connection, the third switching tube is grounded as the ground terminal of the discharge cell.
8. quick discharging circuit according to claim 7, which is characterized in that the discharge cell further includes the first polarity electricity
Hold, first polar capacitor anode connect with the first end of the 4th resistance, the cathode of first polar capacitor and
The source electrode of the third switching tube connects.
9. quick discharging circuit according to claim 8, which is characterized in that the discharge cell further includes third capacitor,
The anode of the first end of the third capacitor and first polar capacitor connect, the second end of the third capacitor and described the
The cathode of one polar capacitor connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821392191.0U CN208767784U (en) | 2018-08-27 | 2018-08-27 | Quick discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821392191.0U CN208767784U (en) | 2018-08-27 | 2018-08-27 | Quick discharging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208767784U true CN208767784U (en) | 2019-04-19 |
Family
ID=66133775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821392191.0U Active CN208767784U (en) | 2018-08-27 | 2018-08-27 | Quick discharging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208767784U (en) |
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2018
- 2018-08-27 CN CN201821392191.0U patent/CN208767784U/en active Active
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