CN202334731U - Heat dissipation protection device for microcrystal optical display rear-projection television - Google Patents
Heat dissipation protection device for microcrystal optical display rear-projection television Download PDFInfo
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- CN202334731U CN202334731U CN2011204398912U CN201120439891U CN202334731U CN 202334731 U CN202334731 U CN 202334731U CN 2011204398912 U CN2011204398912 U CN 2011204398912U CN 201120439891 U CN201120439891 U CN 201120439891U CN 202334731 U CN202334731 U CN 202334731U
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- power
- power supply
- circuit
- heat dissipation
- radiator fan
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Abstract
The utility model discloses a heat dissipation protection device for a microcrystal optical display rear-projection television, relates to the technical field of rear-projection display, and solves the technical problems that internal parts of the rear-projection television are damaged and the service life is shortened because heat cannot be timely dissipated when the rear-projection television is suddenly power-off in the using process. The heat dissipation protection device comprises a power supply arranged in a television body, and heat dissipation fans, and is characterized by also comprising a power-off protection circuit which comprises an energy storage element in the television body, and a fan control detection circuit which is connected with the heat dissipation fans, the power supply and the power-off protection circuit respectively, wherein an electronic switch unit which is connected with the heat dissipation fans, the power supply and the power-off protection circuit respectively and a power-off detection unit which is connected with and controls the electronic switch unit are arranged in the fan control detection circuit and used for power supply switching and power-off detection under the power-off condition respectively. The utility model has the characteristics that: the heat dissipation protection device is not required to be attended and is low in cost, convenient to implement and easy to maintain, and even if the device is damaged, the normal operation of the device is not influenced.
Description
Technical field
The utility model relates to rear-projection Display Technique field, particularly relates to the technology of the heat radiation protection device of a kind of LCD of being used for, DLP or LCOS crystallite light display rear projector TV.
Background technology
Existing crystallite light display rear projector TV comprises casing, is located at bulb, screen, photo engine, speculum, control circuit and cooling mechanism in the casing, and cooling mechanism comprises radiator fan and corresponding wind channels.During the rear-projection TV start; Bulb as light source produces a large amount of heat in meeting; Fraction in the energy of bulb becomes luminous energy and is sent to screen through photo engine, speculum etc., and all the other major parts are distributed at machine intimate with the form of heat energy, and the optical element of photo engine also can absorb a part of impervious light and generates heat; If untimely, can have a strong impact on the operate as normal and the useful life of body with these heats discharge bodies.
Therefore in rear-projection TV, all be provided with the cooling mechanism that comprises that many radiator fans that vary in size and corresponding wind channels constitute, the heat dissipation problem when having solved the rear-projection TV start.When normal shutdown, rear-projection TV has adopted the progressively design of cooling, and for example its core component bulb is when work; Wick is in superhigh temperature semi-molten state; Its temperature is more than 1000C °, have up to 1700C °, extinguishing at bulb after the shutdown has the step-down cooling brightness of 10-15 about second to reduce process; Thereby having guaranteed that bulb is unlikely to extinguish because of sudden power produces the instantaneous high pressure explosion; And power supply after the shutdown still can to radiator fan power supply make its work on fully discharged casing to the interior heat till, thereby guarantee the optics of interior or the safety of electric component, prolong the life-span of rear-projection TV.
But rear-projection TV is during in use because of unexpected factor sudden power, and radiator fan also can be because of the power supply stall simultaneously of stopping power supply, and heat is not in time discharged as yet in this opportunity, can shorten the life-span of machine inner part greatly, is damaged by moment even.And existing power-off protection technology as prices such as UPS are expensive and be not easy to maintenance; Also need manual work to close rear-projection TV after the outage in order to avoid stand-by power supply cuts off the power supply after using up once more; And break down and also can cause the rear-projection TV outage when cutting off the power supply as UPS, so in fact can not deal with problems.
Summary of the invention
To the defective that exists in the above-mentioned prior art; The utility model technical problem to be solved provides a kind of in rear-projection TV uses, the generation can continue as the radiator fan power supply after the sudden power; Make the interior heat of machine in time to discharge; Thereby protection machine inner part can not prolong the rear-projection TV heat radiation protection device that is used for crystallite light display rear projector TV in useful life because of overheated and impaired.
In order to solve the problems of the technologies described above, a kind of heat radiation protection device that is used for crystallite light display rear projector TV that the utility model provided comprises power supply, the radiator fan be located in the body; It is characterized in that: in body, also comprise the power-off protecting circuit that contains energy-storage travelling wave tube; And the fan control testing circuit that connects radiator fan, power supply, power-off protecting circuit respectively; Be provided with electronic switch unit that connects radiator fan, power supply, power-off protecting circuit respectively and the outage detection unit that is connected and controls electronic switch unit in the fan control testing circuit, power supply switching and outage detection when being respectively applied for outage.
Further, the energy-storage travelling wave tube of said power-off protecting circuit is that capacity is greater than 50 μ F electrochemical capacitors or electrochemical capacitor group.
Further; Described power-off protecting circuit comprises charge circuit, discharge loop and accumulator; An end is connected accumulator after charge circuit and the discharge loop parallel connection; The other end connects power supply, control detection circuit and radiator fan respectively, is discharged to radiator fan to accumulator charging and discharge loop by control detection circuit control charge circuit.
Further, be connected to current-limiting resistance, protection diode and FET in the charge circuit, be connected to protection diode and FET in the discharge loop, be connected to big capacity storage capacitor in the accumulator.
The heat radiation protection device that is used for crystallite light display rear projector TV that the utility model provides; Since in body, be provided with when emergency power off can for the interim power supply of radiator fan with the big capacity electrochemical capacitor power-off protecting circuit that is energy-storage travelling wave tube; And power supply switching and outage detection power-off protecting circuit when being used to cut off the power supply; So radiator fan can work on when sudden power; Thereby can heat in the machine in time be discharged, protection machine inner part can be because of not overheated and impaired, thereby prolong rear-projection TV useful life.
Description of drawings
Fig. 1 is the heat radiation protection schematic representation of apparatus that the utility model embodiment is used for crystallite light display rear projector TV;
Fig. 2 is the circuit diagram of the power-off protecting circuit of the utility model embodiment.
Embodiment
Embodiment to the utility model describes in further detail below in conjunction with description of drawings, but present embodiment is not limited to the utility model, and analog structure of every employing the utility model and similar variation thereof all should be listed the protection range of the utility model in.
A kind of heat radiation protection device that is used for crystallite light display rear projector TV as shown in Figure 1, that the utility model provides comprises power supply 4, the radiator fan 2 be located in the body 1, and radiator fan comprises radiator fan on the casing, on the photo engine 6; It is characterized in that: in body 1, also be provided with when emergency power off can for radiator fan 2 interim power supplies with the big capacity electrochemical capacitor power-off protecting circuit 3 that is energy-storage travelling wave tube; And the fan control testing circuit 5 that connects radiator fan 2, power supply 4, power-off protecting circuit 3 respectively; Be provided with electronic switch unit that connects radiator fan 2, power supply 4, power-off protecting circuit 3 respectively and the outage detection unit that is connected and controls electronic switch unit in the fan control testing circuit 5, power supply switching and outage detection when being respectively applied for outage.The energy-storage travelling wave tube of said power-off protecting circuit is that capacity is greater than 50 μ F electrochemical capacitors or electrochemical capacitor group.
During operate as normal,, directly supply power to radiator fan 2 by power supply 4 for complete machine powered switch power supply 4 automatically switches on the fan control testing circuit 5; Because when human factor or extraneous factor cause the unexpected dead electricity of complete machine; Power-off protecting circuit 3 can automatically switch on the fan control testing circuit 5, is that radiator fan 2 provides the electric energy support by the energy-storage travelling wave tube in the power-off protecting circuit 3, owing to use big capacity electrochemical capacitor as energy-storage travelling wave tube; So when the electric capacity electric weight exhausts, the stall of fan nature.
Because power-off protecting circuit 3 is independent of other parts during normal the use, only when the unexpected dead electricity of complete machine, switched to radiator fan 2 power supplies, so even if the impaired operate as normal that also can not influence complete machine of protective circuit.
During operate as normal; Fan control testing circuit 5 is monitored the operating condition of radiator fan 2 in real time through its testing circuit; Its control circuit is according to detecting 2 stalls of data in real time control radiator fan, opening commentaries on classics, reduction of speed or acceleration etc.; Cross low even stall etc. is unusual when taking place when having monitored rotation speed of the fan, control circuit cuts out the corresponding heat generating components in the body immediately, simultaneously alarm.
As shown in Figure 2; Described power-off protecting circuit 3 comprises charge circuit, discharge loop and accumulator; Be connected to current-limiting resistance R1, protection diode D1 and FET Q1 in the charge circuit, be connected to protection diode D2 and FET Q4 in the discharge loop, be connected to big capacity storage capacitor C31, C32, C33, C34, C35 in the accumulator; An end is connected accumulator, another termination power, fan swicth signal FAN_ON/OFF and radiator fan after charge circuit and the discharge loop parallel connection.
Said discharge loop is connected with fan power supply control signal POWER_FAN_CONT in the fan control testing circuit 3; When normal ac dump; Fan power supply control signal POWER_FAN_CONT sends signal, makes that the FET Q4 in the discharge loop ends, and discharge loop is not to radiator fan 2 power supplies; Under the control of control signal, supply power to radiator fan 2, finish until heat radiation by internal power supply 4.
During operate as normal; Fan swicth signal FAN_ON/OFF high level makes the FET Q4 of discharge loop end, and discharge loop is not supplied power to radiator fan; The FET Q1 conducting of charge circuit simultaneously, charging circuit is to storage capacitor C31, C32, C33, C34, C35 charging.
During the rear-projection TV sudden power; Power supply stops to supply power to radiator fan; Fan swicth signal FAN_ON/OFF low level; Make the FET Q1 of charge circuit end, and the FET Q4 conducting of discharge loop, storage capacitor C31, C32, C33, C34, C35 supply power to radiator fan through the diode D2 and the FET Q4 of discharge loop.
Claims (3)
1. a heat radiation protection device that is used for crystallite light display rear projector TV comprises power supply, the radiator fan be located in the body; It is characterized in that: in body, also comprise the power-off protecting circuit that contains energy-storage travelling wave tube; And the fan control testing circuit that connects radiator fan, power supply, power-off protecting circuit respectively; Be provided with electronic switch unit that connects radiator fan, power supply, power-off protecting circuit respectively and the outage detection unit that is connected and controls electronic switch unit in the fan control testing circuit, power supply switching and outage detection when being respectively applied for outage.
2. the heat radiation protection device that is used for crystallite light display rear projector TV according to claim 1 is characterized in that: the energy-storage travelling wave tube of said power-off protecting circuit is that capacity is greater than 50 μ F electrochemical capacitors or electrochemical capacitor group.
3. the heat radiation protection device that is used for crystallite light display rear projector TV according to claim 1; It is characterized in that: described power-off protecting circuit comprises charge circuit, discharge loop and accumulator; An end is connected accumulator after charge circuit and the discharge loop parallel connection; The other end connects power supply, control detection circuit and radiator fan respectively, is discharged to radiator fan to accumulator charging and discharge loop by control detection circuit control charge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204398912U CN202334731U (en) | 2011-11-09 | 2011-11-09 | Heat dissipation protection device for microcrystal optical display rear-projection television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204398912U CN202334731U (en) | 2011-11-09 | 2011-11-09 | Heat dissipation protection device for microcrystal optical display rear-projection television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202334731U true CN202334731U (en) | 2012-07-11 |
Family
ID=46446693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204398912U Expired - Fee Related CN202334731U (en) | 2011-11-09 | 2011-11-09 | Heat dissipation protection device for microcrystal optical display rear-projection television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202334731U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510959A (en) * | 2018-10-29 | 2019-03-22 | 深圳康佳电子科技有限公司 | A kind of control method and control system for preventing laser television from overheating |
-
2011
- 2011-11-09 CN CN2011204398912U patent/CN202334731U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510959A (en) * | 2018-10-29 | 2019-03-22 | 深圳康佳电子科技有限公司 | A kind of control method and control system for preventing laser television from overheating |
| CN109510959B (en) * | 2018-10-29 | 2021-06-01 | 深圳康佳电子科技有限公司 | Control method and control system for preventing laser television from overheating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20131109 |