CN205319676U - Prevent short circuit LED display screen - Google Patents
Prevent short circuit LED display screen Download PDFInfo
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- CN205319676U CN205319676U CN201521063742.5U CN201521063742U CN205319676U CN 205319676 U CN205319676 U CN 205319676U CN 201521063742 U CN201521063742 U CN 201521063742U CN 205319676 U CN205319676 U CN 205319676U
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- led display
- display screen
- current relay
- triode
- resistance
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Abstract
The utility model discloses a prevent short circuit LED display screen, including button switch, protection circuit and LED display screen, the protection circuit includes triode Q1, current relay KT, diode D2, thyristor Q2 and emitting diode D1, emitting diode D1's negative pole is connected with buzzer BU, LED display screen and buzzer BU link with current relay KT's contact. This prevent short circuit LED display screen, normal during operation, the current relay KT cold, the LED display screen is normally worked, and during the short circuit of LED display screen, triode Q1 base voltage reduces the contact that makes current relay KT coil circular telegram actuation, and emitting diode D1 switches on the flash of light and buzzer BU reports to the police, and then the contact between disconnection electric wire netting and the LED display screen to disconnection drive current, thereby protection LED display and whole electric wire netting.
Description
Technical field
The utility model relates to LED display technical field, is specially a kind of against short-circuit LED display.
Background technology
Why in widespread attention LED display is and is developed rapidly, is that the advantage itself having with it is inseparable. These advantages sum up and are: brightness height, operating voltage are low, power consumption is little, maximization, life-span length, shock-resistant and stable performance. The development prospect of LED display is very wide, and just towards more high brightness, more high weather resistance, higher luminance, higher uniformity of luminance, reliability, panchromaticization direction is developed. LED display be widely used in stadiums, commercial applications, bank, card, postal service, harbour, market, station, postal service, telecommunication, office, monitoring, school, dining room, hotel, amusement, etc. the advertising in different outdoor place, if the inner circuit of LED display has occurred the short circuit of certain element short or wire, the rare short of LED monitor power supply path will be made, there will be the situation that voltage increases like this, final structure deteriorate, even initiation fire, causes the loss of life danger and property.
Practical novel content
The purpose of this utility model is to provide a kind of against short-circuit LED display, to solve in above-mentioned background technology the problem proposed.
For achieving the above object, the utility model provides following technical scheme: a kind of against short-circuit LED display, comprise press button, protection circuit and LED display, described protection circuit comprises triode Q1, current relay KT, diode D2, thyristor Q2 and photodiode D1, described comprise the collector electrode of triode Q1 and it is connected to resistance R1 and current relay KT, the emtting electrode of described triode Q1 is connected with press button, described resistance R1 is connected with resistance R2, described current relay KT is connected with the positive pole of diode D2, the negative pole of described diode D2 is connected with the positive pole of photodiode D1, the positive pole of described thyristor Q2 is connected with the positive pole of diode D2, described thyristor Q2 and resistance R2 grounding connection, the negative pole of described photodiode D1 is connected with hummer BU, described hummer BU is connected with the contact of current relay KT, described LED display is connected with current relay KT.
Preferably, it is connected with fixed value resistance between the emtting electrode of described press button and triode Q1.
Compared with prior art; the beneficial effects of the utility model are: this against short-circuit LED display; during normal operation, current relay KT is not energized, LED display normal operation; during LED display short circuit; when triode Q1 base stage voltage reduces, make the contact of current relay KT coil electricity adhesive current relay KT, disconnect the electric current between electrical network and LED display; photodiode D1 conducting flash of light and hummer BU report to the police, thus protect LED indicating meter and whole electrical network.
Accompanying drawing explanation
Fig. 1 is the signal of the utility model structure.
In figure: 1 press button, 2 protection circuit, 20 triode Q1,21 resistance R1,22 resistance R2,23 current relay KT, 24 diode D2,25 state thyristor Q2,26 optical diode D1,27 hummer BU, 3LED display screens.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only the utility model part embodiment, instead of whole embodiments. Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, the utility model provides a kind of technical scheme: a kind of against short-circuit LED display, comprise press button 1, protection circuit 2 and LED display 3, described protection circuit 2 comprises triode Q120, current relay KT23, diode D224, thyristor Q225 and photodiode D126, described comprise the collector electrode of triode Q120 and it is connected to resistance R121 and current relay KT23, the emtting electrode of described triode Q120 is connected with press button 1, it is connected with fixed value resistance between described press button 1 and the emtting electrode of triode Q120, described resistance R121 is connected with resistance R222, described current relay KT23 is connected with the positive pole of diode D224, the negative pole of described diode D224 is connected with the positive pole of photodiode D126, the positive pole of described thyristor Q225 is connected with the positive pole of diode D224, described thyristor Q225 and resistance R222 grounding connection, the negative pole of described photodiode D126 is connected with hummer BU27, described hummer BU27 is connected with the contact of current relay KT23, described LED display 3 is connected with current relay KT23.
When driving a current through press button SB1, and then driving a current through resistance R121, triode Q120 base stage and current relay KT23, now triode Q120 base stage is high level, and triode Q120 ends not conducting, and current relay KT23 is not energized. As short circuit occurs in LED display 3; triode Q120 base potential reduces; triode Q120 conducting; having electric current to flow out by triode Q120 collector electrode, after resistance R121, resistance R222 dividing potential drop, resistance R222 voltage makes thyristor Q225 conducting; electric current electrical equipment KT23 coil contact adhesive; contact makes photodiode D125 conducting luminescence, hummer BU27 report to the police, and current relay KT23 contact disconnects simultaneously does not have electric current to pass through, and plays the effect of protection LED display 3. As needed circuit to be recovered normal, press press button SB1, make whole down circuitry. The contact of current relay KT23 is recovered, and presses press button SB1, and circuit is replied normal.
Although it has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and these embodiments can be carried out multiple change, amendment, replacement and modification when not departing from principle of the present utility model and spirit, scope of the present utility model by claims and etc. jljl limit.
Claims (2)
1. an against short-circuit LED display, comprise press button (1), protection circuit (2) and LED display (3), it is characterized in that: described protection circuit (2) comprises triode Q1 (20), current relay KT (22), diode D2 (23), thyristor Q2 (24) and photodiode D1 (25), described comprise the collector electrode of triode Q1 (20) and it is connected to resistance R1 (21) and current relay KT (23), the emtting electrode of described triode Q1 (20) is connected with press button (1), described resistance R1 (21) is connected with resistance R2 (22), described current relay KT (23) is connected with the positive pole of diode D2 (24), the negative pole of described diode D2 (24) is connected with the positive pole of photodiode D1 (26), the positive pole of described thyristor Q2 (25) is connected with the positive pole of diode D2 (24), described thyristor Q2 (25) and resistance R2 (22) grounding connection, the negative pole of described photodiode D1 (26) is connected with hummer BU (27), described hummer BU (27) is connected with the contact of current relay KT (23), described LED display (3) is connected with current relay KT (23).
2. a kind of against short-circuit LED display according to claim 1, it is characterised in that: it is connected with fixed value resistance between the emtting electrode of described press button (1) and triode Q1 (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521063742.5U CN205319676U (en) | 2015-12-17 | 2015-12-17 | Prevent short circuit LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521063742.5U CN205319676U (en) | 2015-12-17 | 2015-12-17 | Prevent short circuit LED display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205319676U true CN205319676U (en) | 2016-06-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521063742.5U Active CN205319676U (en) | 2015-12-17 | 2015-12-17 | Prevent short circuit LED display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205319676U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786370A (en) * | 2017-01-10 | 2017-05-31 | 洛阳师范学院 | A kind of low-voltage dc power supply output short circuit protective device |
| CN112037723A (en) * | 2020-08-14 | 2020-12-04 | 深圳市晶联讯电子有限公司 | Anti-interference display module based on CMOS device |
-
2015
- 2015-12-17 CN CN201521063742.5U patent/CN205319676U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786370A (en) * | 2017-01-10 | 2017-05-31 | 洛阳师范学院 | A kind of low-voltage dc power supply output short circuit protective device |
| CN112037723A (en) * | 2020-08-14 | 2020-12-04 | 深圳市晶联讯电子有限公司 | Anti-interference display module based on CMOS device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201108 gate 100, No. 150, Lane 2, bottle North Road, Shanghai, Minhang District Patentee after: Shanghai Heng Liang electronic Polytron Technologies Inc Address before: 201108 gate 100, No. 150, Lane 2, bottle North Road, Shanghai, Minhang District Patentee before: Shanghai Henglight Electronic Technology Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |