CN2836376Y - Rear projected TV set - Google Patents
Rear projected TV set Download PDFInfo
- Publication number
- CN2836376Y CN2836376Y CN 200520124734 CN200520124734U CN2836376Y CN 2836376 Y CN2836376 Y CN 2836376Y CN 200520124734 CN200520124734 CN 200520124734 CN 200520124734 U CN200520124734 U CN 200520124734U CN 2836376 Y CN2836376 Y CN 2836376Y
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- temperature
- switch
- connects
- tds
- power supply
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- Expired - Fee Related
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Abstract
The utility model discloses a rear projected television, which comprises a DLP bare engine lamp box and a DC power supply, wherein a temperature-controlling switch is arranged in a temperature sensitive region of the bare engine lamp box, and an inner circuit board is additionally provided with a switch protective circuit. When the temperature on the lamp box reaches a temperature guard point determined by the temperature-controlling switch, the temperature-controlling switch outputs high level signals, and high-level control signals can be output to an I/O opening via the switch protective circuit. When a CPU check the high level control signals, the control system can cut off the power supply of a bulb, and the complete machine can be in a stand-by state. Therefore, the utility model can effectively avoid the damage of the bulb and the bare engine, increase assurance coefficient and stop accidental events of a machine case. The circuit structure of the utility model is simple and reliable and can be used in rear projected televisions of various types.
Description
Technical field
The utility model relates to a kind of back projection television, specifically, relates to a kind of circuit design of on the back projection TV product lamp box of DLP ray machine being carried out overtemperature protection that is applied in.
Background technology
In present DLP back projection television, owing to used ultrahigh pressure mercury lamp, the heating of lamp is very severe.Generally, too high for the lamp box temperature that prevents the DLP ray machine, all can adopt fan that ultrahigh pressure mercury lamp is carried out forced cooling, avoid the generation of accident.But, when fan breaks down, such as fan stall owing to voltage reduces, when phenomenons such as air outlet obstruction perhaps take place, the temperature of high-pressure mercury lamp can sharply raise, thereby can cause burning out of lamp box, also can cause the generation of perils such as fire when serious, be unfavorable for the extensive promotion and application of tv product.
Summary of the invention
The utility model burns out when temperature is too high easily for the machine box that solves DLP ray machine in the prior art; thereby easily cause the problem that peril takes place; a kind of novel back projection television with lamp box temperature overheating protective circuit is provided; by on the lamp box, temperature sensor being set; and cooperate simple temperature control circuit; thereby realized before above-mentioned peril takes place effectively having avoided the damage of DLP optical machine lamp box, improved the reliability of television set complete machine work in time with power remove.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of back projection television comprises ray machine and front-end circuit, includes the bulb part in ray machine, for whole system provides lighting source; Described optical machine lamp box is provided with temperature-sensing element; have additional the switch protection circuit on the inner circuit board; the input of described switch protection circuit connects described temperature-sensing element; export high level or low level control signal according to the signal that temperature-sensing element sends to the I/O of CPU mouth, and then by cut-out or the connection of CPU realization to bulb power.
As further qualification to technique scheme; described temperature-sensing element is a temperature detect switch (TDS); socket by a two-port directly links to each other with the switch protection circuit; one end ground connection of described socket; the other end is leaded up to resistance and is connected DC power supply, and another road links to each other with the input of described switch protection circuit.Include a controllable switch element in described switch protection circuit, the control end of described controllable switch element connects described temperature detect switch (TDS), gating end one end ground connection, and the other end one tunnel connects described DC power supply, and another road connects the I/O mouth of CPU.
As further limiting again to technique scheme; in described switch protection circuit, include two NPN type triodes; the base stage of first NPN type triode connects described temperature detect switch (TDS) through a switching diode; grounded emitter; collector electrode connects described DC power supply on the one hand, connects the base stage of second NPN type triode on the other hand, the grounded emitter of described second NPN type triode; collector electrode connects described DC power supply on the one hand, connects the I/O mouth of CPU on the other hand.
As the further qualification again to technique scheme, described temperature detect switch (TDS) is arranged on the comparatively sensitive zone of temperature on the optical machine lamp box.
Compared with prior art; advantage of the present utility model and good effect are: the utility model is provided with a temperature detect switch (TDS) by select the comparatively sensitive zone of a temperature on the lamp box of DLP ray machine; when the temperature on the lamp box reaches the temperature protection point of temperature detect switch (TDS) setting; temperature detect switch (TDS) is inner to be disconnected; export a high level signal, export high-level control signal to the I/O of CPU mouth by the switch protection circuit on the internal circuit board.After CPU detected this high-level control signal, control system was cut off bulb power, makes complete machine enter holding state, thereby has effectively avoided the damage of bulb and ray machine, has improved coefficient of safety greatly, has stopped the generation of cabinet fortuitous event.
Description of drawings
Fig. 1 is the structural representation that is provided with the optical machine lamp box of temperature detect switch (TDS) in the utility model;
Fig. 2 is switch protection circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Among Fig. 1, temperature detect switch (TDS) 1 is arranged in the zone that temperature is comparatively sensitive on the DLP optical machine lamp box 2, is bonded on the lamp box 2 by heat-conducting glue.The temperature protection point of described temperature detect switch (TDS) 1 needs accurately to measure to be provided with, and when the temperature of lamp box 2 was within range of set temperature, the inside of temperature detect switch (TDS) 1 was conducting; When the unexpected happens, the temperature of lamp box 2 reaches the temperature protection point, and the inside of temperature detect switch (TDS) 1 can automatic disconnection.Utilize these characteristics of temperature detect switch (TDS) 1, designed temperature switch protective circuit as shown in Figure 2.
Among Fig. 2, two terminals of temperature detect switch (TDS) 1 are inserted among the socket XSA14, the 1 pin ground connection of socket XSA14,2 pin one tunnel are through resistance R A162 connection+12V DC power supply, and another road connects the base stage of NPN type triode VA17 through switching diode DA16, resistance R A138, RA147.The grounded emitter of described NPN type triode VA17, collector electrode one tunnel connects described+12V DC power supply through resistance R A146, and another road connects the base stage of NPN type triode VA18.The grounded emitter of described NPN type triode VA18, collector electrode one tunnel connects described+12V DC power supply through resistance R A160, and another road connects the I/O mouth of CPU through resistance R A170, and through resistance R A171 ground connection, exports the TempProtect control signal to CPU.
When the temperature of lamp box 2 is within range of set temperature, temperature detect switch (TDS) 1 inner conducting, 2 pin and 1 pin that are equivalent to socket XSA14 are communicated with, + 12V DC power supply is connected to ground through resistance R A162, NPN type triode VA17 ends, + 12V DC power supply is through the base stage of resistance R A146 effect NPN type triode VA18, control its conducting, thereby drag down its collector potential, making the Temp Protect control signal of the I/O mouth that outputs to CPU is low level, keep the normal power supply of power supply, guarantee the rear-projection TV set operate as normal the ray machine bulb.
When the temperature of lamp box 2 surpasses the temperature protection point of setting; the inside automatic disconnection of temperature detect switch (TDS) 1; positive pole at switching diode DA16 has just applied a high level voltage like this; make diode DA16 conducting; and then make+the 12V DC power supply affacts the base stage of NPN type triode VA17 by resistance R A138, RA147; control its conducting; and then drag down the base potential of NPN type triode VA18; triode VA18 is ended, and+12V DC power supply is exported high level Temp Protect control signal by resistance R A160, RA170 to the I/O of CPU mouth.After CPU detects its I/O mouth that is defined as Temp Protect and is high level, control system is automatically with the dump of ray machine bulb, make complete machine enter holding state, thereby effectively avoided bulb and ray machine, improved the security performance of tv product greatly because of the overheated damage that causes.
The utility model has been realized the overheat protective function to DLP back projection TV product by adopting above-mentioned simple machinery and circuit structure, has well stoped the generation of cabinet fortuitous event, the fail safe that has improved tv product.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (7)
1. back projection television; comprise ray machine and front-end circuit; in ray machine, include the bulb part; for whole system provides lighting source; it is characterized in that: described optical machine lamp box is provided with temperature-sensing element; have additional the switch protection circuit on the inner circuit board; the input of described switch protection circuit connects described temperature-sensing element; export high level or low level control signal according to the signal that temperature-sensing element sends to the I/O of CPU mouth, and then by cut-out or the connection of CPU realization to bulb power.
2. back projection television according to claim 1 is characterized in that: described temperature-sensing element is a temperature detect switch (TDS), an end ground connection of described temperature detect switch (TDS), and the other end one tunnel connects DC power supply, and another road links to each other with the input of described switch protection circuit.
3. back projection television according to claim 2; it is characterized in that: described temperature detect switch (TDS) directly links to each other with the switch protection circuit by the socket of a two-port; one end ground connection of described socket, the other end one tunnel connects DC power supply, and another road links to each other with the input of described switch protection circuit.
4. according to claim 1 or 2 or 3 described back projection televisions; it is characterized in that: in described switch protection circuit, include a controllable switch element; the control end of described controllable switch element connects described temperature detect switch (TDS); gating end one end ground connection; the other end one tunnel connects described DC power supply, and another road connects the I/O mouth of CPU.
5. according to claim 1 or 2 or 3 described back projection televisions; it is characterized in that: in described switch protection circuit, include two NPN type triodes; the base stage of first NPN type triode connects described temperature detect switch (TDS); grounded emitter; collector electrode connects described DC power supply on the one hand; the base stage that connects second NPN type triode on the other hand; the grounded emitter of described second NPN type triode; collector electrode connects described DC power supply on the one hand, connects the I/O mouth of CPU on the other hand.
6. back projection television according to claim 4 is characterized in that: described temperature detect switch (TDS) connects the base stage of described first NPN type triode through a switching diode.
7. back projection television according to claim 5 is characterized in that: described temperature detect switch (TDS) is arranged on the comparatively sensitive zone of temperature on the optical machine lamp box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520124734 CN2836376Y (en) | 2005-11-15 | 2005-11-15 | Rear projected TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520124734 CN2836376Y (en) | 2005-11-15 | 2005-11-15 | Rear projected TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2836376Y true CN2836376Y (en) | 2006-11-08 |
Family
ID=37301025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520124734 Expired - Fee Related CN2836376Y (en) | 2005-11-15 | 2005-11-15 | Rear projected TV set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2836376Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715089A (en) * | 2008-10-06 | 2010-05-26 | 康佳集团股份有限公司 | Method and system for automatic photosensitive protection of television and television |
| CN101241297B (en) * | 2007-02-07 | 2011-07-06 | 深圳Tcl新技术有限公司 | DLP projector equipment for controlling DLP lamp tube and method |
-
2005
- 2005-11-15 CN CN 200520124734 patent/CN2836376Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241297B (en) * | 2007-02-07 | 2011-07-06 | 深圳Tcl新技术有限公司 | DLP projector equipment for controlling DLP lamp tube and method |
| CN101715089A (en) * | 2008-10-06 | 2010-05-26 | 康佳集团股份有限公司 | Method and system for automatic photosensitive protection of television and television |
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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: 20061108 Termination date: 20091215 |