CN202797876U - Mining intrinsic safety type light-emitting diode (LED) display screen - Google Patents
Mining intrinsic safety type light-emitting diode (LED) display screen Download PDFInfo
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- CN202797876U CN202797876U CN 201220425020 CN201220425020U CN202797876U CN 202797876 U CN202797876 U CN 202797876U CN 201220425020 CN201220425020 CN 201220425020 CN 201220425020 U CN201220425020 U CN 201220425020U CN 202797876 U CN202797876 U CN 202797876U
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- circuit
- voltage stabilizing
- led display
- intrinsic safety
- display screen
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Abstract
The utility model discloses a mining intrinsic safety type light-emitting diode (LED) display screen. The mining intrinsic safety type LED display screen comprises a power circuit and an LED display screen body and is characterized in that the power circuit is an intrinsic safety circuit which comprises a trigger circuit, a step-down transformer, a full-bridge rectifying circuit, a filter circuit, a voltage reference circuit, a primary voltage stabilizing circuit, a second voltage stabilizing circuit, a voltage limiting circuit and an output control switch, wherein the step-down transformer, the full-bridge rectifying circuit, the filter circuit, the voltage reference circuit, the primary voltage stabilizing circuit, the second voltage stabilizing circuit, the voltage limiting circuit and the output control switch are connected in sequence, and the primary voltage stabilizing circuit and the second voltage stabilizing circuit are respectively and correspondingly connected with a first voltage limiting circuit and a second voltage limiting circuit. Due to the fact that the intrinsic safety circuit exists, once the power circuit is abnormal, spark produced by electric energy does not cause explosion, and the LED display screen body and relevant electrical equipment are protected.
Description
Technical field
The utility model relates to a kind of mining electric-control system, relates in particular to a kind of Mine-used I. S LED display.
Background technology
Because often there are methane damp and coal dust explosion hazard in the down-hole, the operational environment of various mining electric-control systems that therefore is operated in the down-hole is comparatively abominable.A lot of mining electric-control systems have independently LED display at present, and these LED displays are used the common power circuit supply usually, in case power circuit occurs unusually, the spark that electric energy produces sets off an explosion easily.
The utility model content
The purpose of this utility model is to provide a kind of Mine-used I. S LED display with intrinsic safety performance.
For achieving the above object, the utility model provides a kind of Mine-used I. S LED display, comprise power circuit and LED display, described power circuit is intrinsic safety electric source, described intrinsic safety electric source comprises circuits for triggering, and the step-down transformer, full bridge rectifier, filter circuit, voltage reference circuit, one-level voltage stabilizing circuit, secondary voltage stabilizing circuit, pressure limiting circuit and the output control switch that link to each other successively, described one-level voltage stabilizing circuit and described secondary voltage stabilizing circuit have been connected respectively the first current-limiting circuit and the second current-limiting circuit.
In the Mine-used I. S LED display of the present utility model, when the Voltage-output that detects the secondary voltage stabilizing circuit when pressure limiting circuit is higher than set point, then turn-off output control switch.When the first current-limiting circuit detect one-level voltage stabilizing circuit electric current output greater than set point the time, then close the one-level voltage stabilizing circuit; In like manner, when the second current-limiting circuit detect secondary voltage stabilizing circuit electric current output greater than set point the time, then close the secondary voltage stabilizing circuit.Because the existence of intrinsic safety electric source, in case that power circuit occurs is unusual, the spark that electric energy produces can not set off an explosion, thereby has protected the related electric equipment such as LED display.
Description of drawings
Fig. 1 is the circuit structure block diagram of Mine-used I. S LED display of the present utility model;
Fig. 2 is the circuit theory diagrams of intrinsic safety electric source in the Mine-used I. S LED display of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail:
With reference to illustrated in figures 1 and 2, the Mine-used I. S LED display of present embodiment comprises intrinsic safety electric source and LED display, this intrinsic safety electric source comprises the circuits for triggering that are made of the filter circuit, full bridge rectifier and the optocoupler output circuit that link to each other successively, and the step-down transformer, full bridge rectifier, filter circuit, voltage reference circuit, one-level voltage stabilizing circuit, secondary voltage stabilizing circuit, pressure limiting circuit and the output control switch that link to each other successively, one-level voltage stabilizing circuit and secondary voltage stabilizing circuit have been connected respectively the first current-limiting circuit and the second current-limiting circuit.Wherein, the first current-limiting circuit and the second current-limiting circuit are by the comparison circuit of operational amplifier and its peripheral circuit formation, and sample circuit formation that sample resistance consists of, one end of described sample circuit links to each other with the output of corresponding voltage stabilizing circuit, the other end links to each other with the input of corresponding comparison circuit, and the output of corresponding comparison circuit links to each other with the control end of corresponding voltage stabilizing circuit.Sample circuit is coated with the epoxy encapsulation layer, plays the waterproof sealing effect.
The Mine-used I. S LED display of present embodiment, exchange output 12V direct current after processing through step-down transformer, full bridge rectifier, voltage reference circuit, one-level voltage stabilizing circuit from the 127V of the elementary input of step-down transformer, become the 5V direct current after the 12V direct current is processed through the secondary voltage stabilizing circuit and by output control switch Q1 output again.When the Voltage-output that detects the secondary voltage stabilizing circuit when pressure limiting circuit is higher than 5V, then turn-off output control switch Q1.When the first current-limiting circuit detect one-level voltage stabilizing circuit electric current output greater than set point the time, then close the one-level voltage stabilizing circuit; In like manner, when the second current-limiting circuit detect secondary voltage stabilizing circuit electric current output greater than set point the time, then close the secondary voltage stabilizing circuit.
Above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (4)
1. Mine-used I. S LED display, comprise power circuit and LED display, it is characterized in that, described power circuit is intrinsic safety electric source, described intrinsic safety electric source comprises circuits for triggering, and the step-down transformer, full bridge rectifier, filter circuit, voltage reference circuit, one-level voltage stabilizing circuit, secondary voltage stabilizing circuit, pressure limiting circuit and the output control switch that link to each other successively, described one-level voltage stabilizing circuit and described secondary voltage stabilizing circuit have been connected respectively the first current-limiting circuit and the second current-limiting circuit.
2. Mine-used I. S LED display according to claim 1, it is characterized in that, described the first current-limiting circuit and described the second current-limiting circuit are by the comparison circuit of operational amplifier and its peripheral circuit formation, and sample circuit formation that sample resistance consists of, one end of described sample circuit links to each other with the output of corresponding voltage stabilizing circuit, the other end links to each other with the input of corresponding comparison circuit, and the output of corresponding comparison circuit links to each other with the control end of corresponding voltage stabilizing circuit.
3. Mine-used I. S LED display according to claim 2 is characterized in that, described sample circuit is coated with the epoxy encapsulation layer.
4. Mine-used I. S LED display according to claim 3 is characterized in that, described circuits for triggering are made of the filter circuit, full bridge rectifier and the optocoupler output circuit that link to each other successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220425020 CN202797876U (en) | 2012-08-24 | 2012-08-24 | Mining intrinsic safety type light-emitting diode (LED) display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220425020 CN202797876U (en) | 2012-08-24 | 2012-08-24 | Mining intrinsic safety type light-emitting diode (LED) display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202797876U true CN202797876U (en) | 2013-03-13 |
Family
ID=47825054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220425020 Expired - Fee Related CN202797876U (en) | 2012-08-24 | 2012-08-24 | Mining intrinsic safety type light-emitting diode (LED) display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202797876U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864588A (en) * | 2019-11-14 | 2020-03-06 | 北京龙德时代技术服务有限公司 | Digital carbon dioxide rock breaking process and detonation system |
-
2012
- 2012-08-24 CN CN 201220425020 patent/CN202797876U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864588A (en) * | 2019-11-14 | 2020-03-06 | 北京龙德时代技术服务有限公司 | Digital carbon dioxide rock breaking process and detonation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20170824 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |