CN104638601A - Teaching projector delay outage protection circuit - Google Patents
Teaching projector delay outage protection circuit Download PDFInfo
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- CN104638601A CN104638601A CN201310553822.8A CN201310553822A CN104638601A CN 104638601 A CN104638601 A CN 104638601A CN 201310553822 A CN201310553822 A CN 201310553822A CN 104638601 A CN104638601 A CN 104638601A
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- diode
- electric capacity
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- triode
- resistance
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Abstract
The invention discloses a teaching projector delay outage protection circuit comprising a first diode, a second diode, a third diode, a fourth diode, a relay, a first triode, a second triode, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch, a neon bulb, a first fuse, a second fuse, a rectifier and a bulb. According to the circuit, the bulb of the projector is powered off after three minutes after the projector is powered off, the correct switching-off manner of the projector is guaranteed, the service life of the projector is prolonged, structure is simple, manufacture cost is low, and high promotion and popularization value is provided.
Description
Technical field
The present invention relates to a kind of delay cut-off protective circuit, particularly relate to a kind of delay cut-off protective circuit of educational projector.
Background technology
We must in strict accordance with correct using method at use multimedia projector, after finishing using, first should turn off the bulb power of projecting apparatus, the general supply of projecting apparatus must by the time shut down indicator light bright after just can cut off, this process approximately will wait 3 minutes, because fan will continue outside heat extraction, if violation operation can cause very large damage to bulb.
Summary of the invention
Object of the present invention is just the delay cut-off protective circuit providing a kind of educational projector in order to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes the first diode, second diode, 3rd diode, 4th diode, relay, first triode, second triode, first resistance, second resistance, 3rd resistance, first electric capacity, second electric capacity, 3rd electric capacity, first switch, second switch, neon bulb, first fuse, second fuse, rectifier and bulb, the first end of described first fuse is connected with the phase line end of AC power, second end of described first fuse is connected with the first end of described first switch and the first end of described relay contact simultaneously, the zero line side of described AC power is connected with the first end of described bulb and the first input end of described rectifier simultaneously, with the second end of described relay contact while of the second end of described bulb, the first end of described second fuse, second end of described first switch is connected with the first end of described second resistance, second end of described second fuse is connected with the first end of described first electric capacity and the first end of described first resistance simultaneously, second end of described first electric capacity is connected with the second end of described first resistance and the second input of described rectifier simultaneously, with the negative pole of described second electric capacity while of the negative pole of described rectifier, the positive pole of described first diode, the negative pole of described 3rd electric capacity is connected with the emitter of described second triode, the positive pole of described second electric capacity simultaneously with the positive pole of described rectifier, the negative pole of described first diode, the first end of described second switch, the first end of described relay coil is connected with the negative pole of described 4th diode, second end of described second resistance is connected with the first end of described neon bulb, second end of described neon bulb is connected with the negative pole of described second diode, the positive pole of described second diode is connected with the second end of described second switch and the positive pole of described 3rd diode simultaneously, the negative pole of described 3rd diode is connected with the positive pole of described 3rd electric capacity and the first end of described 3rd resistance simultaneously, second end of described 3rd resistance is connected with the base stage of described first triode, the collector electrode of described first triode simultaneously with the second end of described relay coil, the positive pole of described 4th diode is connected with the collector electrode of described second triode, and the emitter of described first triode is connected with the base stage of described second triode.
Particularly, described first switch and described second switch are linked switch, and described second electric capacity and described 3rd electric capacity are polar capacitor, and described first diode is voltage stabilizing didoe, and described relay contact is normally opened contact.
Beneficial effect of the present invention is:
The present invention is a kind of delay cut-off protective circuit of educational projector; can in projecting apparatus power-off its projecting apparatus bulb just power-off after 3 minutes; ensure that the correct shutdown of projecting apparatus; extend the useful life of projecting apparatus; and structure is simple; cost of manufacture is lower, has the value of higher penetration and promotion.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the delay cut-off protective circuit of a kind of educational projector of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention includes the first diode D1, second diode D2, 3rd diode D3, 4th diode D4, relay K, first triode Q1, second triode Q2, first resistance R1, second resistance R2, 3rd resistance R3, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, first switch S 1, second switch S2, neon bulb N, first fuse FU1, second fuse FU2, rectifier BR and bulb HL, first switch S 1 and second switch S2 are linked switch, second electric capacity C2 and the 3rd electric capacity C3 is polar capacitor, first diode D1 is voltage stabilizing didoe, relay K contact is normally opened contact, the first end of the first fuse FU1 is connected with the phase line end of AC power, second end of the first fuse FU1 is connected with the first end of the first switch S 1 and the first end of relay K contact simultaneously, the zero line side of AC power is connected with the first end of bulb HL and the first input end of rectifier BR simultaneously, with the second end of relay K contact while of the second end of HL bulb, the first end of the second fuse FU2, second end of the first switch S 1 is connected with the first end of the second resistance R2, second end of the second fuse FU2 is connected with the first end of the first electric capacity C1 and the first end of the first resistance R1 simultaneously, second end of the first electric capacity C1 is connected with second end of the first resistance R1 and second input of rectifier BR simultaneously, with the negative pole of the second electric capacity C2 while of the negative pole of rectifier BR, the positive pole of the first diode D1, the negative pole of the 3rd electric capacity C3 is connected with the emitter of the second triode Q2, the positive pole of the second electric capacity C2 simultaneously with the positive pole of rectifier BR, the negative pole of the first diode D1, the first end of second switch S2, the first end of relay K coil is connected with the negative pole of the 4th diode D4, second end of the second resistance R2 is connected with the first end of neon bulb N, second end of neon bulb N is connected with the negative pole of the second diode D2, the positive pole of the second diode D2 is connected with second end of second switch S2 and the positive pole of the 3rd diode D3 simultaneously, the negative pole of the 3rd diode D3 is connected with the positive pole of the 3rd electric capacity C3 and the first end of the 3rd resistance R3 simultaneously, second end of the 3rd resistance R3 is connected with the base stage of the first triode Q1, the collector electrode of the first triode Q1 simultaneously with the second end of relay K coil, the positive pole of the 4th diode D4 is connected with the collector electrode of the second triode Q2, and the emitter of the first triode Q1 is connected with the base stage of the second triode Q2.
The present invention is a kind of delay cut-off protective circuit of educational projector, as closed first switch S 1 and second switch S2, AC power conducting, alternating current 220V voltage is after the first electric capacity C1 step-down simultaneously, by rectifier BR rectification, again through the second electric capacity C2 electrolysis filtering, first diode D1 voltage stabilizing, obtain 9V direct voltage, for relay K and delay circuit, electric current charges to the 3rd electric capacity C3 through the 3rd diode D3, at this moment the switching circuit that the first triode Q1 and the second triode Q2 form to obtain after higher bias voltage saturation conduction immediately, relay K obtains electric, its normally opened contact becomes closed, at this moment electric main is that projecting apparatus bulb HL powers through relay K contact, because the 3rd electric capacity C3 charges after disconnecting the first switch S 1 and second switch S2, electric charge of depositing is discharged to the first triode Q1 by the 3rd resistance R3, make the first triode Q1 and the second triode Q2 still saturation conduction, relay K contact still closes, so bulb HL is still energized, delay time is determined (should make the device selecting delay time to be greater than 3 minutes herein) by the discharge time constant of the 3rd electric capacity C3 and the 3rd resistance R3, after delay time arrives, relay K dead electricity makes its contact separately, bulb HL dead electricity, time delay process completes, when closed first switch S 1 and second switch S2, neon bulb N is luminous, represent bulb HL energising, when disconnecting the first switch S 1 and second switch S2, neon bulb N does not work, bulb HL is energized to 3 minutes and turns off later again.
Claims (2)
1. a delay cut-off protective circuit for educational projector, is characterized in that: comprise the first diode, second diode, 3rd diode, 4th diode, relay, first triode, second triode, first resistance, second resistance, 3rd resistance, first electric capacity, second electric capacity, 3rd electric capacity, first switch, second switch, neon bulb, first fuse, second fuse, rectifier and bulb, the first end of described first fuse is connected with the phase line end of AC power, second end of described first fuse is connected with the first end of described first switch and the first end of described relay contact simultaneously, the zero line side of described AC power is connected with the first end of described bulb and the first input end of described rectifier simultaneously, with the second end of described relay contact while of the second end of described bulb, the first end of described second fuse, second end of described first switch is connected with the first end of described second resistance, second end of described second fuse is connected with the first end of described first electric capacity and the first end of described first resistance simultaneously, second end of described first electric capacity is connected with the second end of described first resistance and the second input of described rectifier simultaneously, with the negative pole of described second electric capacity while of the negative pole of described rectifier, the positive pole of described first diode, the negative pole of described 3rd electric capacity is connected with the emitter of described second triode, the positive pole of described second electric capacity simultaneously with the positive pole of described rectifier, the negative pole of described first diode, the first end of described second switch, the first end of described relay coil is connected with the negative pole of described 4th diode, second end of described second resistance is connected with the first end of described neon bulb, second end of described neon bulb is connected with the negative pole of described second diode, the positive pole of described second diode is connected with the second end of described second switch and the positive pole of described 3rd diode simultaneously, the negative pole of described 3rd diode is connected with the positive pole of described 3rd electric capacity and the first end of described 3rd resistance simultaneously, second end of described 3rd resistance is connected with the base stage of described first triode, the collector electrode of described first triode simultaneously with the second end of described relay coil, the positive pole of described 4th diode is connected with the collector electrode of described second triode, and the emitter of described first triode is connected with the base stage of described second triode.
2. the delay cut-off protective circuit of a kind of educational projector according to claim 1; it is characterized in that: described first switch and described second switch are linked switch; described second electric capacity and described 3rd electric capacity are polar capacitor; described first diode is voltage stabilizing didoe, and described relay contact is normally opened contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310553822.8A CN104638601A (en) | 2013-11-08 | 2013-11-08 | Teaching projector delay outage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310553822.8A CN104638601A (en) | 2013-11-08 | 2013-11-08 | Teaching projector delay outage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104638601A true CN104638601A (en) | 2015-05-20 |
Family
ID=53217053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310553822.8A Pending CN104638601A (en) | 2013-11-08 | 2013-11-08 | Teaching projector delay outage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104638601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713784A (en) * | 2019-03-05 | 2019-05-03 | 湖北汇程信息技术有限公司 | A kind of power-supply management system for electronic equipment |
-
2013
- 2013-11-08 CN CN201310553822.8A patent/CN104638601A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713784A (en) * | 2019-03-05 | 2019-05-03 | 湖北汇程信息技术有限公司 | A kind of power-supply management system for electronic equipment |
| CN109713784B (en) * | 2019-03-05 | 2022-05-27 | 湖北汇程信息技术有限公司 | Power management system for electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |
|
| WD01 | Invention patent application deemed withdrawn after publication |