CN100385336C - Safety control device for heat elimination of digital projector - Google Patents
Safety control device for heat elimination of digital projector Download PDFInfo
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- CN100385336C CN100385336C CNB2004100182824A CN200410018282A CN100385336C CN 100385336 C CN100385336 C CN 100385336C CN B2004100182824 A CNB2004100182824 A CN B2004100182824A CN 200410018282 A CN200410018282 A CN 200410018282A CN 100385336 C CN100385336 C CN 100385336C
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Abstract
The present invention relates to a safety control device for the heat radiation of digital projectors, which is used in the technical field of electronic devices. The input end of a charging control circuit of the present invention is connected with the direct current (DC) power supply end of a projector, and the output end of the charging control circuit is connected with a chargeable battery of which the output end is connected with the DC power supply input end of an axial fan and the DC power supply input end of each corresponding detecting and control circuit of the projector in parallel through a protection power supply control circuit; the output end of a voltage sensor is connected with the input end of a voltage detecting circuit; the output end of a temperature sensor is connected with the input end of a temperature detecting circuit; output signals of the voltage detecting circuit and the temperature detecting circuit are respectively connected with the input end of the control circuit. Four output ends of the control circuit are respectively connected with the charging control circuit, the protection power supply control circuit, a timing circuit and a buzzer; the output end of the timing circuit, which is used as another control signal of the control circuit, is connected with the other input end of the control circuit.
Description
Technical field
The present invention relates to a kind of digital projector, in particular, relate to a kind of heat radiation safety control of digital projector.Be used for electronic equipment class technical field.
Background technology
Along with digital projector in multimedia technology field, use more and more universal, the intensity of light source or brightness to projector have proposed more and more higher requirement, for example, when digital projector is applied in the broadcasting of digital camera, in order to reach the demand of broadcasting and the display effect of the video display projection in some middle-size and small-size digital cameras or the public place of entertainment, the intensity of light source that digital projector had or brightness are apart from being far longer than employed light intensity of common projector or brightness.Along with the raising of the intensity of light source or brightness, its heat that produces and gather in complete machine is also increasing, so the radiating and cooling of projector is an important problems.
Find by literature search, disclosed a kind of heat abstractor of projector in the utility model patent of " heat abstractor of projector " of people such as Liao Wenneng application (on September 16th, 2002 application and on August 20th, 2003 are open, Chinese patent publication number No.2567614).This device mainly utilizes newly-designed air channel to realize the heat radiation and the cooling of light source bulb.Yet as the heat abstractor of most of projectors, it is just based on structural design improved or optimize the effect of the radiating and cooling that improves or improve light source bulb.
As everyone knows, digital projector is as its light source mostly with metal mercury lamp, metal sodium vapor lamp or metal halide lamp.In the process of projection demonstration, light source can produce a large amount of heats.The heat that projector produced mainly is to rely on the air intake/air draft of axial flow air ejector fan high speed rotating to come radiating and cooling.Therefore, the work of aerofoil fan is very important.Particularly, in projector applications when Active-Movie is broadcast, the needs of broadcasting for the large scale screen that adapts to Active-Movie, tend to adopt the light source of high brightness more or intensity, and the light source bulb of high brightness usually is thereby that a few hours continuous working makes projector bigger at the heat that when work institute produces and gathers, so the radiating and cooling effect of aerofoil fan is even more important.The fault of present projector very major part is that non-normal power down is caused.For example, after projector's long-term work, particularly after having broadcast a digital movie, produced in the projector and gathered a large amount of heats, and this heat to distribute and lower the temperature mainly be to rely on the air intake/air draft of the high speed rotating of aerofoil fan to realize.If immediately irrelevantly take out the connecting line of power supply behind user's powered-down this moment, causes the infringement of projector thereby then certainly will cause the aerofoil fan stall to dispel the heat.In the process that Active-Movie is broadcast, this phenomenon of the failure is even more serious in projector applications.
Summary of the invention
The present invention is directed to the deficiencies in the prior art and defective, a kind of heat radiation safety control of digital projector is provided.Make it can avoid effectively extracting and making radiator fan quit work too early to cause whole set equipment to fail the caused projector of fine heat radiation to damage owing to electric power connection line after the powered-down.
The present invention is achieved by the following technical solutions, the present invention includes voltage temperature and detect control section and outage safeguard protection power unit two parts.Wherein, voltage temperature detection control section comprises: voltage sensor and voltage detecting circuit, temperature sensor and temperature sensing circuit, control circuit, timing circuit and hummer; Outage safeguard protection power unit comprises charging control circuit, rechargeable battery and protection power control circuit.Wherein, voltage detecting circuit and temperature sensing circuit also comprise detection amplification and threshold value comparator circuit separately.
Connected mode between the various piece: the input end of charging control circuit is connecting projector's dc power supply terminal; its output terminal is connecting rechargeable battery; the output terminal of rechargeable battery is by the be connected in parallel voltage sensor of projector of protection power control circuit; voltage detecting circuit; temperature sensor; temperature sensing circuit; control circuit; the dc supply input of timing circuit and hummer and the dc supply input of aerofoil fan; the direct supply voltage of projector and the supply voltage of fan are detected in the test section of voltage sensor; and the output terminal of this voltage sensor is connected with the input end of voltage detecting circuit; near the temperature the light source of projector bulb is detected in the test section of temperature sensor; its output terminal is connecting the input end of temperature sensing circuit; the output signal of voltage detecting circuit and temperature sensing circuit is connected with the input end of control circuit respectively; four output terminals of control circuit are connecting charging control circuit respectively; the protection power control circuit; timing circuit and hummer, and the output terminal of timing circuit is connecting another input end of control circuit as another control signal of control circuit.
When operate as normal; the outage safeguard protection power supply that charging control circuit, rechargeable battery and protection power control circuit constitute together is in normal charging condition; charging control circuit is realized the control to the voltage magnitude and the current amplitude of charging current; to guarantee the timeliness and the safety of rechargeable battery, make it to be in all the time under the state of full power.When the detection control section of voltage sensor detects when off-position occurring; just to control signal of control circuit output; control circuit responds this signal and provides the stand-by protection power supply to voltage sensor, voltage detecting circuit, temperature sensor, temperature sensing circuit, control circuit, timing circuit and hummer immediately by protection power control circuit control rechargeable battery, still can work under the complete machine off-position to guarantee these circuit.At this moment, if near the light source bulb that detects the temperature of parts be lower than predetermined temperature threshold, then temperature sensing circuit is just no longer to control circuit output control signal.So; under the control of control circuit; after the delay of a period of time of process timing circuit; automatically cut off outage safeguard protection power supply and offer the power supply of voltage sensor, voltage detecting circuit, temperature sensor, temperature sensing circuit, control circuit, timing circuit and hummer, thereby enter into the stopped status of complete machine.Otherwise, if this moment, temperature sensor and the detected temperature of testing circuit surpassed the predetermined threshold value temperature, that is to say, although the heat that institute produced and gathers when complete machine had been in off-position still owing to complete machine work still is in the state that needs radiating and cooling, then temperature sensing circuit is just to control signal of control circuit output.Control circuit responds this control signal, and control protection power control circuit switches to outage safeguard protection power supply with the power supply of radiator fan.Provide the working power of fan by outage safeguard protection power supply, thereby guarantee that aerofoil fan can work on when complete machine needs radiating and cooling, with the infringement of avoiding complete machine to cause owing to the improper outage of power supply.Simultaneously, control circuit also makes hummer can send sound equipment clocklike, with the prompting user power supply of resuming work as early as possible, to ensure the normal radiating and cooling of complete machine.The alarm signal that is sent can extend to and recover normal duty, promptly, complete machine has normal working power can realize normal radiating and cooling with the operate as normal that satisfies aerofoil fan, and perhaps, complete machine temperature has been reduced to and need not aerofoil fan under the normality threshold and work on.Under caution prompting at hummer; the user has recovered normal power supply and has connected earlier; then voltage sensor and voltage detecting circuit will be represented supply voltage control signal working properly to control circuit output, thereby make control circuit will protect power control circuit to switch to normal operating conditions again.
The present invention is by the setting of heat radiation safety control, can avoid effectively since after the powered-down electric power connection line extract and make radiator fan quit work too early to cause whole set equipment to fail the damage of the caused projector of fine heat radiation.The present invention is not only applicable to conventional liquid crystal color projector, also is applicable to video display projector.Compare with conventional liquid crystal color projector, the light-source brightness of video display projector or intensity are all much bigger, the time of continuous working is also much longer, the heat that produces and gather is also bigger, dispels the heat accordingly and lower the temperature also particularly importantly, so application of the present invention can have special tangible advantage.
Description of drawings
Fig. 1 is the electric functional-block diagram of a preferred embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing preferred embodiment of the present invention is described in further detail,, the figure illustrates the electric functional-block diagram of the heat radiation safety control of preferred embodiment of the present invention with reference to figure 1.The heat radiation safety control of preferred embodiment comprises that voltage temperature detects control section 1 and outage safeguard protection power unit 2 two parts according to the present invention.Wherein, voltage temperature detection control section 1 comprises: voltage sensor 3 and voltage detecting circuit 4, temperature sensor 5 and temperature sensing circuit 6, control circuit 7, timing circuit 8 and hummer 9; Outage safeguard protection power unit 2 comprises: charging control circuit 10, rechargeable battery 11 and protection power control circuit 12.Wherein, voltage detecting circuit 4 and temperature sensing circuit 6 also comprise detection amplification and threshold value comparator circuit (not shown) separately.
Connected mode between each ingredient: the input end of charging control circuit 10 is connecting projector's dc power supply terminal; its output terminal is connecting rechargeable battery 11; the output terminal of rechargeable battery 11 by protection power control circuit 12 (for example; miniature intermediate relay) the be connected in parallel voltage sensor 3 of projector; voltage detecting circuit 4; temperature sensor 5; temperature sensing circuit 6; control circuit 7; the dc supply input of the dc supply input of timing circuit 8 and hummer 9 and aerofoil fan (not shown); the direct supply voltage of projector and the supply voltage of fan are detected in the test section of voltage sensor 3; and the output terminal of this voltage sensor 3 is connected with the input end of voltage detecting circuit 4; near the temperature the light source of projector bulb (not shown) is detected in the test section of temperature sensor 5; its output terminal is connecting the input end of temperature sensing circuit 6; the output signal of voltage detecting circuit 4 and temperature sensing circuit 6 is connected with the input end of control circuit 7 respectively; four output terminals of control circuit 7 are connecting charging control circuit 10 respectively; protection power control circuit 12; timing circuit 8 and hummer 9, and the output terminal of timing circuit 8 is connecting another input end of control circuit 7 as another control signal of control circuit 7.
When operate as normal; the outage safeguard protection power unit 2 that charging control circuit 10, rechargeable battery 11 and protection power control circuit 12 constitute together can be in normal charging condition under the control of control circuit 7; charging control circuit 10 can be realized the control to the voltage magnitude and the current amplitude of charging current; to guarantee the timeliness and the safety of rechargeable battery 11, make it to be in all the time under the state of full power.The direct current supply that detects supply voltage and aerofoil fan when the detection control section of voltage sensor 4 (for example off-position occurs, supply voltage power down 75%) time, the control signal of power-down state just appears in its voltage detecting circuit 4 to expression of control circuit 7 outputs; Control circuit 7 these signals of response and cut off being connected to rechargeable battery 11 and dc power supply terminal by charging control circuit 10; and make protection power control circuit 12 control rechargeable batteries 11 provide the stand-by protection power supply to voltage sensor 3, voltage detecting circuit 4, temperature sensor 5, temperature sensing circuit 6, control circuit 7, timing circuit 8 and hummer 9 immediately, under the complete machine off-position, still can work on to guarantee these circuit.At this moment, if the temperature of parts has been lower than predetermined temperature threshold near the temperature sensor 5 light source bulb (not shown) that detects, then temperature sensing circuit 6 is just to normothermic control signal of expression of control circuit 7 outputs.So; under the control of control circuit 7; after the delay of a period of time (about 5 seconds) of process timing circuit 8; automatically cut off outage safeguard protection power supply 2 parts and offer the working power of voltage sensor 3, voltage detecting circuit 4, temperature sensor 5, temperature sensing circuit 6, control circuit 7, timing circuit 8 and hummer 9, thereby enter into the stopped status of complete machine.Otherwise, if this moment, temperature sensor 5 and testing circuit 6 detected temperature surpassed the predetermined threshold value temperature, that is to say, although complete machine has been in off-position, but the heat that institute produces and gathers during owing to complete machine work still is in the state that needs radiating and cooling, and then temperature sensing circuit 6 is just to control signal of representing temperature anomaly of control circuit 7 outputs.Control circuit 7 these control signals of response, the power supply of the aerofoil fan (not shown) that control charging control circuit 10 and protection power control circuit 12 will be used to dispel the heat switches to outage safeguard protection power supply 2.Provide the working power of fan by outage safeguard protection power unit 2, thereby guaranteeing that aerofoil fan can work on satisfies the needs of complete machine needs radiating and cooling, with the infringement of avoiding complete machine to cause owing to the improper outage of complete machine power supply.Simultaneously, control circuit 7 also makes hummer 9 can send sound equipment clocklike, with the prompting user power supply of resuming work as early as possible, to ensure the normal radiating and cooling of complete machine.The alarm signal that is sent can extend to and recover normal duty, promptly, complete machine has normal working power can realize normal radiating and cooling with the operate as normal that satisfies aerofoil fan, and perhaps, complete machine temperature has been reduced to and need not aerofoil fan under the normality threshold and work on.Under the prompting of hummer 9 caution sound equipments; the user has recovered normal power lead and has connected; then voltage sensor 3 and voltage detecting circuit 4 will be represented supply voltages control signal working properly to one of control circuit 7 output, thereby make control circuit 7 will protect power control circuit 12 to switch to normal operating conditions again.
Obviously, adopted the heat radiation safety control of preferred embodiment of the present invention, can avoid effectively can't working and causing whole set equipment and fail the caused projector of fine heat radiation and damage owing to the inappropriate aerofoil fan of extracting too early so that dispelling the heat of electric power connection line after the complete machine powered-down.
The present invention is not only applicable to conventional color liquid crystal projector, also is applicable to video display projector. With conventional liquid Brilliant color projector is compared, and the light-source brightness of video display projector or intensity is the time of much bigger, continuous operation all Also much longer, the heat that produces and gather is also bigger, dispel the heat accordingly and lower the temperature also particularly important, therefore this The application of invention can have special obvious advantage.
Claims (7)
1. the heat radiation safety control of a digital projector; have voltage temperature and detect control section (1) and outage safeguard protection power unit (2) two parts; it is characterized in that; described voltage temperature detects control section (1) and comprising: voltage sensor (3) and voltage detecting circuit (4); temperature sensor (5) and temperature sensing circuit (6); control circuit (7); timing circuit (8) and hummer (9); described outage safeguard protection power unit (2) comprising: charging control circuit (10); rechargeable battery (11) and protection power control circuit (12); connected mode between the each several part: the input end of charging control circuit (10) is connecting projector's dc power supply terminal; its output terminal is connecting rechargeable battery (11); the output terminal of rechargeable battery (11) is by the be connected in parallel voltage sensor (3) of projector of protection power control circuit (12); voltage detecting circuit (4); temperature sensor (5); temperature sensing circuit (6); control circuit (7); the dc supply input of timing circuit (8) and hummer (9) and the dc supply input of aerofoil fan; the direct supply voltage of projector and the supply voltage of fan are detected in the test section of voltage sensor (3); and the output terminal of this voltage sensor (3) is connected with the input end of voltage detecting circuit (4); near the temperature the light source of projector bulb is detected in the test section of temperature sensor (5); its output terminal is connecting the input end of temperature sensing circuit (6); the output signal of voltage detecting circuit (4) and temperature sensing circuit (6) is connected with the input end of control circuit (7) respectively; four output terminals of control circuit (7) are connecting charging control circuit (10) respectively; protection power control circuit (12); timing circuit (8) and hummer (9), and the output terminal of timing circuit (8) is connecting another input end of control circuit (7) as another control signal of control circuit (7).
2. the heat radiation safety control of digital projector according to claim 1 is characterized in that, described voltage detecting circuit (4) and temperature sensing circuit (6) also comprise detection amplification and threshold value comparator circuit respectively.
3. the heat radiation safety control of digital projector according to claim 1 is characterized in that, described charging control circuit (10) is realized the control to the voltage magnitude and the current amplitude of charging current.
4. the heat radiation safety control that is applicable to digital projector according to claim 1 is characterized in that, when operate as normal, described outage safeguard protection power unit (2) is in normal charging condition under the control of control circuit (7).
5. the heat radiation safety control of digital projector according to claim 1; it is characterized in that; when power down occurring, described outage safeguard protection power unit (2) provides working power to voltage sensor (3), voltage detecting circuit (4), temperature sensor (5), temperature sensing circuit (6), control circuit (7), timing circuit (8) and hummer (9) under the control of control circuit (7).
6. the heat radiation safety control of digital projector according to claim 1; it is characterized in that; when power down and complete machine temperature occurring and be higher than threshold temperature, described outage safeguard protection power unit (2) provides dc supply to the aerofoil fan that is used to dispel the heat under the control of control circuit (7).
7. the heat radiation safety control of digital projector according to claim 1; it is characterized in that; power down and complete machine temperature are lower than or when equaling threshold temperature, described outage safeguard protection power unit (2) is being provided after delay after a while under the control of control circuit (7) by the working power that is provided to voltage sensor (3), voltage detecting circuit (4), temperature sensor (5), temperature sensing circuit (6), control circuit (7), timing circuit (8) and hummer (9) occurring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100182824A CN100385336C (en) | 2004-05-13 | 2004-05-13 | Safety control device for heat elimination of digital projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100182824A CN100385336C (en) | 2004-05-13 | 2004-05-13 | Safety control device for heat elimination of digital projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1570758A CN1570758A (en) | 2005-01-26 |
| CN100385336C true CN100385336C (en) | 2008-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100182824A Expired - Fee Related CN100385336C (en) | 2004-05-13 | 2004-05-13 | Safety control device for heat elimination of digital projector |
Country Status (1)
| Country | Link |
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| CN (1) | CN100385336C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4670602B2 (en) | 2005-11-16 | 2011-04-13 | セイコーエプソン株式会社 | Projection system, projector, and information processing apparatus |
| CN101086610B (en) * | 2006-06-07 | 2010-05-12 | 明基电通股份有限公司 | Method for controlling heat radiation according to wind inlet and outlet and related device |
| CN101377614A (en) | 2007-08-31 | 2009-03-04 | 鸿富锦精密工业（深圳）有限公司 | Heat radiation system of projector |
| CN101493635B (en) * | 2008-12-19 | 2011-08-10 | 上海广茂达光艺科技股份有限公司 | Liquid crystal projection lamp and control method thereof |
| CN102033401A (en) * | 2010-10-27 | 2011-04-27 | 许崇良 | Projection imaging method and system based on red, green and blue LED light sources |
| CN104807557A (en) * | 2014-01-29 | 2015-07-29 | 中强光电股份有限公司 | Temperature detector and projector using same |
| CN110702377B (en) * | 2019-10-21 | 2022-03-25 | 歌尔光学科技有限公司 | Abnormality detection method, projection apparatus, and computer-readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425989A2 (en) * | 1989-10-31 | 1991-05-08 | Seiko Epson Corporation | Liquid crystal video projector |
| CN2504666Y (en) * | 2001-11-15 | 2002-08-07 | 深圳市北大方正数码科技有限公司 | Projector with emergency protector |
| JP2003233130A (en) * | 2002-02-07 | 2003-08-22 | Sanyo Electric Co Ltd | Liquid crystal projector |
-
2004
- 2004-05-13 CN CNB2004100182824A patent/CN100385336C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425989A2 (en) * | 1989-10-31 | 1991-05-08 | Seiko Epson Corporation | Liquid crystal video projector |
| CN2504666Y (en) * | 2001-11-15 | 2002-08-07 | 深圳市北大方正数码科技有限公司 | Projector with emergency protector |
| JP2003233130A (en) * | 2002-02-07 | 2003-08-22 | Sanyo Electric Co Ltd | Liquid crystal projector |
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| Publication number | Publication date |
|---|---|
| CN1570758A (en) | 2005-01-26 |
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Granted publication date: 20080430 Termination date: 20110513 |