CN105429095A - Time-delay power off circuit of projector - Google Patents
Time-delay power off circuit of projector Download PDFInfo
- Publication number
- CN105429095A CN105429095A CN201510982163.9A CN201510982163A CN105429095A CN 105429095 A CN105429095 A CN 105429095A CN 201510982163 A CN201510982163 A CN 201510982163A CN 105429095 A CN105429095 A CN 105429095A
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- China
- Prior art keywords
- circuit unit
- integrated chip
- electrochemical capacitor
- switch
- locking switch
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Relay Circuits (AREA)
Abstract
The invention discloses a power time delay adjustable socket control circuit. The circuit comprises a power circuit unit, a 555 timing circuit unit, a relay control circuit unit and a socket controllable circuit unit, wherein the socket controllable circuit unit is connected with the power circuit unit, the power circuit unit provides power for the 555 timing circuit unit, the 555 timing circuit unit is connected with the relay control circuit unit, timed control on the relay control circuit unit is realized through the 555 timing circuit unit, and the relay control circuit unit controls a normally open switch K1. A power control circuit capable of executing time-delay power off after a main power supply is cut off is provided for solving the phenomena often found during a teaching process, for instance, the projector installed recently has aging trace of liquid crystal sheets, and for some projectors, bulbs are even damaged by bursting and cannot be lighted.
Description
Technical field
The present invention relates to a kind of power supply time delay adjustable socket control circuit, belong to application of electronic technology field.
Background technology
Multimedia technology aided education is used widely in various kinds of schools and unit, omnibearingly improves quality of instruction and operating efficiency.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, just dress projecting apparatus has soon occurred that LCD panel has aging vestige, and the bulb explosion that even occurs had damages and the phenomenon such as cannot to light, and these reasons are all the above-mentioned faults that improper use causes by 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; when closing projecting apparatus; the radiator fan of its inside can remain in operation, and when the temperature of instrument to be projected is reduced to certain value, projecting apparatus could formally shut down; if but rashly power supply were pulled out in fan running process, so projecting apparatus will there will be bulb explosion.Therefore, electronic technology is used to design a kind of delay cut-off technology to the useful life of projecting apparatus and saves energy important in inhibiting.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of simple to operate, can when cutting off the electricity supply, can the power control circuit of delay cut-off.
In order to overcome the above problems, technical scheme provided by the invention is: a kind of projecting apparatus circuit capable of delaying disconnection, comprise: power circuit unit, 555 timing circuit unit, control relay circuit unit and socket controlable electric current unit, wherein, socket conditioned circuit unit comprises: plug J1, socket J2, linkage self-locking switch S 1 and relay normally open K switch 1, the positive terminal of described plug J1 is connected with one end of linkage self-locking switch S 1, the other end of described linkage self-locking switch S 1 and the L of socket J2 hold, the electrode input end of power circuit unit connects, the negative pole end of described plug J1 and the N of socket J2 hold, the negative input of power circuit unit connects, described relay normally open K switch 1 and linkage self-locking switch S 1 parallel connection, described 555 timing circuit unit comprise: 555 integrated chip U2, linkage self-locking switch S 2, linkage self-locking switch S 3, electrochemical capacitor C5, triode Q1, variable resistor R2, with the cathode output end of power circuit unit after 4 pin of resistance R1 and electric capacity C6, described 555 integrated chip U2 are connected with 8 pin, resistance R1 one end, variable resistor R2 one end connects, and 2 pin of described 555 integrated chip U2 are connected with 6 pin afterwards and linkage self-locking switch S 3 one end, electrochemical capacitor C5 positive pole, switch triode Q1 emitter is connected, described switch triode Q1 base stage and the resistance R1 other end, one end of linkage self-locking switch S 2 is connected, and its collector electrode is connected with the variable resistor R2 other end, and 5 ends of described 555 integrated chip U2 are connected with electric capacity C6 one end, 1 end of described 555 integrated chip U2, linkage self-locking switch S 2 other end, linkage self-locking switch S 3 other end, electrochemical capacitor C5 negative pole is connected with the cathode output end of power circuit unit after being connected with the electric capacity C6 other end, and 3 ends of described 555 integrated chip U2 are connected with control relay circuit unit.
Further, described control relay circuit unit comprises diode D3 and the relay K for control relay normal open switch K1, be connected with 3 ends of 555 integrated chip U2 after the described negative pole of diode D3, the positive pole of relay K are connected, be connected with the cathode output end of power circuit unit after the described positive pole of diode D3, the negative pole of relay K are connected.This structure is simple and easy to implement.
Further, also comprise delay indicating circuit unit, described delay indicating circuit unit comprises resistance R3 and light-emitting diode D2,3 ends of described 555 integrated chip U2 are connected with resistance R3 one end, the described resistance R3 other end is connected with the positive pole of light-emitting diode D2, and the described negative pole of light-emitting diode D2 is connected with the cathode output end of power circuit unit.After linkage self-locking switch cutoff, light-emitting diode is lighted, and shows main for cut-out electricity after a few minutes.
Further, described power circuit unit comprises transformer T1, bridge rectifier diode D1, electrochemical capacitor C1, electric capacity C2, three-terminal voltage-stabilizing integrated chip U1, electrochemical capacitor C3 and electric capacity C4; The output of described transformer T1 is connected with the input of bridge rectifier diode D1, the output of bridge rectifier diode D1 is connected with electrochemical capacitor C1, described electric capacity C2 is in parallel with electrochemical capacitor C1, the input of described three-terminal voltage-stabilizing integrated chip U1 is connected with the output of bridge rectifier diode D1, the output of described three-terminal voltage-stabilizing integrated chip U1 is connected with electrochemical capacitor C3, and described electric capacity C4 is in parallel with electrochemical capacitor C3.This simple structure is practical.
Compared with prior art; the invention has the beneficial effects as follows; timing controlled control relay circuit unit is realized by 555 timing circuit unit; control relay circuit unit controls normal open switch K1; cut off main power source, can the power control circuit of delay cut-off, often can find in teaching process to solve; firm dress projecting apparatus soon occurs that LCD panel has aging vestige, and what have even occurs that bulb explosion damages and the phenomenon such as cannot to light.
Accompanying drawing explanation
Fig. 1 electrical block diagram of the present invention.
Embodiment
By reference to the accompanying drawings, the specific embodiment of the present invention is described;
As Fig. 1, a kind of projecting apparatus circuit capable of delaying disconnection, comprise: power circuit unit 1, 555 timing circuit unit 2, control relay circuit unit 4 and socket controlable electric current unit, wherein, socket conditioned circuit unit comprises: plug J1, socket J2, linkage self-locking switch S 1 and relay normally open K switch 1, the positive terminal of described plug J1 is connected with one end of linkage self-locking switch S 1, the other end of described linkage self-locking switch S 1 and the L of socket J2 hold, the electrode input end of power circuit unit connects, the negative pole end of described plug J1 and the N of socket J2 hold, the negative input of power circuit unit connects, described relay normally open K switch 1 and linkage self-locking switch S 1 parallel connection, described 555 timing circuit unit comprise: 555 integrated chip U2, linkage self-locking switch S 2, linkage self-locking switch S 3, electrochemical capacitor C5, triode Q1, variable resistor R2, with the cathode output end of power circuit unit after 4 pin of resistance R1 and electric capacity C6, described 555 integrated chip U2 are connected with 8 pin, resistance R1 one end, variable resistor R2 one end connects, and 2 pin of described 555 integrated chip U2 are connected with 6 pin afterwards and linkage self-locking switch S 3 one end, electrochemical capacitor C5 positive pole, switch triode Q1 emitter is connected, described switch triode Q1 base stage and the resistance R1 other end, one end of linkage self-locking switch S 2 is connected, and its collector electrode is connected with the variable resistor R2 other end, and 5 ends of described 555 integrated chip U2 are connected with electric capacity C6 one end, 1 end of described 555 integrated chip U2, linkage self-locking switch S 2 other end, linkage self-locking switch S 3 other end, electrochemical capacitor C5 negative pole is connected with the cathode output end of power circuit unit after being connected with the electric capacity C6 other end, and 3 ends of described 555 integrated chip U2 are connected with control relay circuit unit.
Circuit working principle is as follows: (1) presses and self-locking as linkage self-locking switch S 1, S2, S3, socket J2 and power circuit unit obtain electric, 2 pin and the 6 pin input voltages of 555 integrated chip U2 are 0, be less than 1/3Vcc, 3 pin of 555 integrated chip U2 export high level, relay K obtains electric, and relay normally open K switch 1 closes; Triode Q1 base potential is 0 simultaneously, and triode Q1 ends.(2) when projecting apparatus is finished using, when needing to cut off the electricity supply, press linkage self-locking switch S 1, S2, S3, because electrochemical capacitor C5 both end voltage can not be suddenlyd change, its positive pole remains 0 current potential, 3 pin of 555 integrated chip U2 still export high level, relay normally open K switch 1 still adhesive, socket J2 and power circuit unit still electric; After meanwhile switch S 2 discharges and disconnects, switch triode Q1 base potential is high potential, Q1 saturation conduction, power circuit unit is charged to C5 by R2, when C5 both end voltage is charged to 2/3Vcc(8V by 0) time, the 3 pin voltage reversal of 555 integrated chip U2, become low level, relay K dead electricity, relay normally open K switch 1 is opened, socket J2 power down.
Preferably, described control relay circuit unit 4 comprises diode D3 and the relay K for control relay normal open switch K1, be connected with 3 ends of 555 integrated chip U2 after the described negative pole of diode D3, the positive pole of relay K are connected, be connected with the cathode output end of power circuit unit after the described positive pole of diode D3, the negative pole of relay K are connected.This circuit can adjust as the case may be, for the folding of control relay normal open switch K1.
Preferably, described power circuit unit 1 comprises transformer T1, bridge rectifier diode D1, electrochemical capacitor C1, electric capacity C2, three-terminal voltage-stabilizing integrated chip U1, electrochemical capacitor C3 and electric capacity C4; The output of described transformer T1 is connected with the input of bridge rectifier diode D1, the output of bridge rectifier diode D1 is connected with electrochemical capacitor C1, described electric capacity C2 is in parallel with electrochemical capacitor C1, the input of described three-terminal voltage-stabilizing integrated chip U1 is connected with the output of bridge rectifier diode D1, the output of described three-terminal voltage-stabilizing integrated chip U1 is connected with electrochemical capacitor C3, and described electric capacity C4 is in parallel with electrochemical capacitor C3.
In the above-described embodiments, a kind of projecting apparatus circuit capable of delaying disconnection also comprises delay indicating circuit unit 3, described delay indicating circuit unit 3 comprises resistance R3 and light-emitting diode D2,3 ends of described 555 integrated chip U2 are connected with resistance R3 one end, the described resistance R3 other end is connected with the positive pole of light-emitting diode D2, and the described negative pole of light-emitting diode D2 is connected with the cathode output end of power circuit unit.After linkage self-locking switch cutoff, light-emitting diode is lighted, and shows main for cut-out electricity after a few minutes.
Now provide a concrete circuit, give each component parameters and model, plug J1 connects AC220v civil power, transformer transfers 220v to 12v alternating current, be IN4007 through its model of bridge rectifier diode D2(), electrochemical capacitor C1 (470uf/25V), after electric capacity C2 (104uf) rectifying and wave-filtering, the three-terminal voltage-stabilizing integrated chip U1 being 7812 through model exports direct current 12V electricity, power by giving 555 timing circuit unit after electrochemical capacitor C3 (100uf/25v) and electric capacity C4 (104uf) filtering voltage regulation, in 555 timing circuit unit, R1 value 22k ohm, R2 value 2M ohm, triode Q1 is designed on off state, model 9013NPN, electrochemical capacitor C5 value 1000uf, withstand voltage 25V, electric capacity C6 value 0.01uf, R3 value is 2.2k ohm, D2 is LED light-emitting diode.Electrochemical capacitor C5 is charged to voltage 2/3Vcc(8V) time is about t=1.1R2C5, and delay time (3 minutes ~ 40 minutes), in the present invention, delay time is 5 minutes.
Described in the present invention, concrete case study on implementation is only better case study on implementation of the present invention, is not used for limiting practical range of the present invention.Namely all equivalences done according to the content of the present patent application the scope of the claims change and modify, all should as technology category of the present invention.
Claims (4)
1. a projecting apparatus circuit capable of delaying disconnection, it is characterized in that, comprise: power circuit unit, 555 timing circuit unit, control relay circuit unit and socket controlable electric current unit, wherein, socket conditioned circuit unit comprises: plug J1, socket J2, linkage self-locking switch S 1 and relay normally open K switch 1, the positive terminal of described plug J1 is connected with one end of linkage self-locking switch S 1, the other end of described linkage self-locking switch S 1 and the L of socket J2 hold, the electrode input end of power circuit unit connects, the negative pole end of described plug J1 and the N of socket J2 hold, the negative input of power circuit unit connects, described relay normally open K switch 1 and linkage self-locking switch S 1 parallel connection, described 555 timing circuit unit comprise: 555 integrated chip U2, linkage self-locking switch S 2, linkage self-locking switch S 3, electrochemical capacitor C5, triode Q1, variable resistor R2, with the cathode output end of power circuit unit after 4 pin of resistance R1 and electric capacity C6, described 555 integrated chip U2 are connected with 8 pin, resistance R1 one end, variable resistor R2 one end connects, and 2 pin of described 555 integrated chip U2 are connected with 6 pin afterwards and linkage self-locking switch S 3 one end, electrochemical capacitor C5 positive pole, switch triode Q1 emitter is connected, described switch triode Q1 base stage and the resistance R1 other end, one end of linkage self-locking switch S 2 is connected, and its collector electrode is connected with the variable resistor R2 other end, and 5 ends of described 555 integrated chip U2 are connected with electric capacity C6 one end, 1 end of described 555 integrated chip U2, linkage self-locking switch S 2 other end, linkage self-locking switch S 3 other end, electrochemical capacitor C5 negative pole is connected with the cathode output end of power circuit unit after being connected with the electric capacity C6 other end, and 3 ends of described 555 integrated chip U2 are connected with control relay circuit unit.
2. a kind of projecting apparatus circuit capable of delaying disconnection as claimed in claim 1, it is characterized in that, described control relay circuit unit comprises diode D3 and the relay K for control relay normal open switch K1, be connected with 3 ends of 555 integrated chip U2 after the described negative pole of diode D3, the positive pole of relay K are connected, be connected with the cathode output end of power circuit unit after the described positive pole of diode D3, the negative pole of relay K are connected.
3. a kind of projecting apparatus circuit capable of delaying disconnection as described in claim 1 or 2, it is characterized in that, also comprise delay indicating circuit unit, described delay indicating circuit unit comprises resistance R3 and light-emitting diode D2,3 ends of described 555 integrated chip U2 are connected with resistance R3 one end, the described resistance R3 other end is connected with the positive pole of light-emitting diode D2, and the described negative pole of light-emitting diode D2 is connected with the cathode output end of power circuit unit.
4. a kind of projecting apparatus circuit capable of delaying disconnection as described in claim 1 or 2, it is characterized in that, described power circuit unit comprises transformer T1, bridge rectifier diode D1, electrochemical capacitor C1, electric capacity C2, three-terminal voltage-stabilizing integrated chip U1, electrochemical capacitor C3 and electric capacity C4; The output of described transformer T1 is connected with the input of bridge rectifier diode D1, the output of bridge rectifier diode D1 is connected with electrochemical capacitor C1, described electric capacity C2 is in parallel with electrochemical capacitor C1, the input of described three-terminal voltage-stabilizing integrated chip U1 is connected with the output of bridge rectifier diode D1, the output of described three-terminal voltage-stabilizing integrated chip U1 is connected with electrochemical capacitor C3, and described electric capacity C4 is in parallel with electrochemical capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510982163.9A CN105429095A (en) | 2015-12-22 | 2015-12-22 | Time-delay power off circuit of projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510982163.9A CN105429095A (en) | 2015-12-22 | 2015-12-22 | Time-delay power off circuit of projector |
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| Publication Number | Publication Date |
|---|---|
| CN105429095A true CN105429095A (en) | 2016-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510982163.9A Pending CN105429095A (en) | 2015-12-22 | 2015-12-22 | Time-delay power off circuit of projector |
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| CN (1) | CN105429095A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8929045B2 (en) * | 2011-11-23 | 2015-01-06 | Hon Hai Precision Industry Co., Ltd. | Delay protection circuit and electronic device employing the same |
| CN204244552U (en) * | 2014-12-25 | 2015-04-01 | 江苏理工学院 | Projecting apparatus time delay adjustable socket control circuit |
| CN204244204U (en) * | 2014-12-25 | 2015-04-01 | 江苏理工学院 | Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket |
| CN205304211U (en) * | 2015-12-22 | 2016-06-08 | 南京信息职业技术学院 | Projecting apparatus delayed power failure circuit |
-
2015
- 2015-12-22 CN CN201510982163.9A patent/CN105429095A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8929045B2 (en) * | 2011-11-23 | 2015-01-06 | Hon Hai Precision Industry Co., Ltd. | Delay protection circuit and electronic device employing the same |
| CN204244552U (en) * | 2014-12-25 | 2015-04-01 | 江苏理工学院 | Projecting apparatus time delay adjustable socket control circuit |
| CN204244204U (en) * | 2014-12-25 | 2015-04-01 | 江苏理工学院 | Projecting apparatus power cut off delay control circuit and projecting apparatus delayed power socket |
| CN205304211U (en) * | 2015-12-22 | 2016-06-08 | 南京信息职业技术学院 | Projecting apparatus delayed power failure circuit |
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Application publication date: 20160323 |