CN204244204U - Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket - Google Patents
Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket Download PDFInfo
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- CN204244204U CN204244204U CN201420834440.2U CN201420834440U CN204244204U CN 204244204 U CN204244204 U CN 204244204U CN 201420834440 U CN201420834440 U CN 201420834440U CN 204244204 U CN204244204 U CN 204244204U
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- circuit
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- projecting apparatus
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Abstract
The utility model relates to a kind of projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket, comprising: capacity voltage dropping circuit, in order to by the step-down of 220V alternating voltage; Full-wave rectifier filter circuit, receiving the alternating current after capacity voltage dropping circuit step-down, is direct current by AC conversion; Three-terminal voltage-stabilizing circuit, receives the direct current that full-wave rectifier filter circuit transforms, direct current voltage stabilizing is exported; Delay circuit, provides working power voltage by three-terminal voltage-stabilizing circuit, is exported by voltage; Relay executive circuit, is driven by delay circuit, controls delayed power socket delay cut-off.This projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket can when cutting off the electricity supply, delay cut-off, thus prevent the bulb of projecting apparatus inside from damaging because continuous high temperature cannot dispel the heat, and improve useful life.
Description
Technical field
The utility model patent relates to a kind of power cut off delay control circuit, and particularly a kind of projecting apparatus power cut off delay control circuit and supply socket, belong to application of electronic technology field.
Background technology
Along with the development of Modern Educational Knowledge, application of multimedia technology is carried out teaching and is greatly improved operating efficiency and quality of instruction.In multimedia teaching facility, projecting apparatus presents to student by clear and intuitive for the content of courses, is the core of multimedia education system.And often can find in teaching process; drop shadow effect's deviation of firm dress projecting apparatus soon; color is dim; contrast is not enough; occur that LCD panel has aging vestige; what have even occurs that bulb explosion damages and the phenomenon such as cannot to light, and is all the above-mentioned fault that improper use causes through these reasons of technical Analysis.Because projecting apparatus operationally; use high-power bulb; cause internal temperature very high; under normal circumstances; itself there is protective circuit projecting apparatus inside, and when closing projecting apparatus, the radiator fan of its inside can remain in operation; when the temperature of instrument to be projected is reduced to certain value, projecting apparatus could formal shutdown.If but rashly power supply is pulled out in fan running process, so temperature still unusual height of the temperature of projecting apparatus inside particularly bulb, so high temperature does not leave, the physical strength of bulb luminous component element very low will be caused, aggravation LCD panel and circuit aging, the serious bulb that directly causes bursts.Therefore, electronic technology is used to design the actual use of a kind of power-off protection technology to projecting apparatus significant.
Utility model content
The technical problems to be solved in the utility model is: in order to provide a kind of simple to operate, can when cutting off the electricity supply the projecting apparatus power cut off delay control circuit of delay cut-off and projecting apparatus delayed power socket.
The utility model solves the technical scheme that its technical problem adopts: a kind of projecting apparatus power cut off delay control circuit, comprising:
Capacity voltage dropping circuit, in order to by the step-down of 220V alternating voltage;
Full-wave rectifier filter circuit, receiving the alternating current after capacity voltage dropping circuit step-down, is direct current by AC conversion;
Three-terminal voltage-stabilizing circuit, receives the direct current that full-wave rectifier filter circuit transforms, direct current voltage stabilizing is exported;
Delay circuit, provides working power voltage by three-terminal voltage-stabilizing circuit, is exported by voltage;
Relay executive circuit, is driven by delay circuit, controls delayed power socket delay cut-off.
In the utility model one preferred embodiment, 220V alternating voltage is depressurized to 30V by described capacity voltage dropping circuit.
In the utility model one preferred embodiment, direct current voltage stabilizing is exported 9V direct voltage by described three-terminal voltage-stabilizing circuit.
In the utility model one preferred embodiment, in described delay circuit, be provided with 555 integrated circuits.
The utility model also provides a kind of projecting apparatus delayed power socket, comprises the input power cord of interchange and the inserted terminal of socket, its power line is connected with above-mentioned projecting apparatus power cut off delay control circuit.
The beneficial effects of the utility model are: projecting apparatus power cut off delay control circuit of the present utility model and projecting apparatus delayed power socket can when cutting off the electricity supply, delay cut-off, thus prevent the bulb of projecting apparatus inside from damaging because continuous high temperature cannot dispel the heat, improve useful life.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the structured flowchart of the utility model projecting apparatus power cut off delay control circuit;
Fig. 2 is the circuit theory diagrams of the utility model projecting apparatus power cut off delay control circuit;
In figure: 1. capacity voltage dropping circuit, 2. full-wave rectifier filter circuit, 3. three-terminal voltage-stabilizing circuit, 4. delay circuit, 5. relay executive circuit, 6. delayed power socket.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, a kind of projecting apparatus power cut off delay control circuit, comprising:
Capacity voltage dropping circuit 1, in order to be depressurized to 30V by 220V alternating voltage;
Full-wave rectifier filter circuit 2, receiving the alternating current after capacity voltage dropping circuit 1 step-down, is direct current by AC conversion;
Three-terminal voltage-stabilizing circuit 3, receives the direct current that full-wave rectifier filter circuit 2 transforms, and direct current voltage stabilizing is exported 9V direct voltage;
Delay circuit 4, provides working power voltage by three-terminal voltage-stabilizing circuit 3, and voltage exports by 555 integrated circuits in delay circuit 4;
Relay executive circuit 5, is driven by delay circuit 4, controls delayed power socket 6 delay cut-off.
The utility model also provides a kind of projecting apparatus delayed power socket, comprises the input power cord of interchange and the inserted terminal of socket, its power line is connected with above-mentioned projecting apparatus power cut off delay control circuit.
Operation principle of the present utility model is as shown in Figure 2:
(1), when ganged switch S1-1/S1-2 is not closed, relay switch J1-1/J1-2 is normally open, and circuit does not have electricity;
(2) after ganged switch S1-1/S1-2 is closed, 220V alternating current exports 9V direct voltage through capacity voltage dropping circuit 1, full-wave rectifier filter circuit 2, three-terminal voltage-stabilizing circuit 3
, triode Q2 powers through R5, R7 and is in saturation conduction, triode Q2 current collection very 0.7V, make 555 integrated circuit 2 pin input voltages lower than
time, rest-set flip-flop set in 555 integrated circuits, 555 integrated circuit 3 pin export high level 9V, and relay J obtains electric switch J1-1/J1-2 adhesive, and power supply delay socket DS1 obtains 220V alternating current.Simultaneously because triode Q1 base stage is powered by S1-2, light-emitting diode D5, R6, be set as through saturation conduction state, triode Q1 conducting current collection very low-voltage, make 555 integrated circuit 6 pin be that low-voltage 0.7V(is less than
), circuit is in SM set mode, and 555 integrated circuits enter temporary stable state and cannot overturn, so 555 integrated circuit 3 pin are always high level 9V voltage, make relay be in attracting state all the time, delayed power socket DS1 has 220V alternating current always;
(3) when the moment that ganged switch S1-1/S1-2 disconnects, triode Q1, Q2, due to base stage dead electricity, make triode Q1, Q2 end instantaneously, and electric capacity C7 is charged through R2, C7 loop, when C7 capacitance voltage is charged to by 0.7V
time, 555 integrated circuit upsets, 3 pin output low levels, relay electric-loss, switch J1-1/J1-2 disconnects, delayed power socket DS1 dead electricity, from having electricity to the time T=1.1RC not having electricity.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.
Claims (5)
1. a projecting apparatus power cut off delay control circuit, is characterized in that, comprising:
Capacity voltage dropping circuit, in order to by the step-down of 220V alternating voltage;
Full-wave rectifier filter circuit, receiving the alternating current after capacity voltage dropping circuit step-down, is direct current by AC conversion;
Three-terminal voltage-stabilizing circuit, receives the direct current that full-wave rectifier filter circuit transforms, direct current voltage stabilizing is exported;
Delay circuit, provides working power voltage by three-terminal voltage-stabilizing circuit, is exported by voltage;
Relay executive circuit, is driven by delay circuit, controls delayed power socket delay cut-off.
2. projecting apparatus power cut off delay control circuit as claimed in claim 1, it is characterized in that, 220V alternating voltage is depressurized to 30V by described capacity voltage dropping circuit.
3. projecting apparatus power cut off delay control circuit as claimed in claim 1, is characterized in that, direct current voltage stabilizing is exported 9V direct voltage by described three-terminal voltage-stabilizing circuit.
4. projecting apparatus power cut off delay control circuit as claimed in claim 1, is characterized in that, be provided with 555 integrated circuits in described delay circuit.
5. a projecting apparatus delayed power socket, comprises the input power cord of interchange and the inserted terminal of socket, it is characterized in that, its power line is connected with the projecting apparatus power cut off delay control circuit as described in any one of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420834440.2U CN204244204U (en) | 2014-12-25 | 2014-12-25 | Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420834440.2U CN204244204U (en) | 2014-12-25 | 2014-12-25 | Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204244204U true CN204244204U (en) | 2015-04-01 |
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ID=52773642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420834440.2U Expired - Fee Related CN204244204U (en) | 2014-12-25 | 2014-12-25 | Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204244204U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429095A (en) * | 2015-12-22 | 2016-03-23 | 南京信息职业技术学院 | Time-delay power off circuit of projector |
| CN108770166A (en) * | 2018-05-11 | 2018-11-06 | 沈阳东软医疗系统有限公司 | A kind of X-ray emitter power-off protection control method, device and equipment |
-
2014
- 2014-12-25 CN CN201420834440.2U patent/CN204244204U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429095A (en) * | 2015-12-22 | 2016-03-23 | 南京信息职业技术学院 | Time-delay power off circuit of projector |
| CN108770166A (en) * | 2018-05-11 | 2018-11-06 | 沈阳东软医疗系统有限公司 | A kind of X-ray emitter power-off protection control method, device and equipment |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20161225 |