CN101035230A - Back projection TV with the cut-off protection - Google Patents
Back projection TV with the cut-off protection Download PDFInfo
- Publication number
- CN101035230A CN101035230A CN 200610024437 CN200610024437A CN101035230A CN 101035230 A CN101035230 A CN 101035230A CN 200610024437 CN200610024437 CN 200610024437 CN 200610024437 A CN200610024437 A CN 200610024437A CN 101035230 A CN101035230 A CN 101035230A
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- power
- projection
- power supply
- protection
- radiator fan
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Abstract
The invention provides a back projection TV set with power-off protection, comprising a case as well as light engine, circuit board, lighter, light source, reflector and heat radiating fan arranged in the case, and also comprising: a power-off protection circuit with capacitor as energy storage component. As compared with the existing techniques, it adopts farad-grade capacitors to compose the power-off protection circuit, able to assure the heat radiating fan continues working and radiates heat in time after sudden power-off and thus prolonging the service life of the back-projection TV set and the inside expensive devices.
Description
Technical field
The present invention relates to a kind of rear-projection TV, relate in particular to a kind of rear-projection TV with power-off protection.
Background technology
Traditional liquid crystal rear-projection TV, comprise transmission-type liquid crystal rear-projection TV (being the LCD rear-projection TV) and reflective liquid crystal rear-projection TV (being the LCOS rear-projection TV), generally comprise lamp optical system, coloured light split-optics, first to the 3rd electro-optical device (its center part is the composite set of liquid crystal light valve and polarizer, and liquid crystal light valve comprises transmissive liquid crystal light valve LCD or reflection-type liquid crystal light valve LCOS device), coloured light synthesizer, projector optical apparatus and screen.In the liquid crystal rear-projection TV, first to the 3rd electro-optical device is respectively successively by first to the 3rd coloured light, generally speaking, first to the 3rd coloured light is respectively red, green, blue or indigo plant, green, red trichromatism light, wherein the first and the 3rd coloured light penetrates and projects on the screen by projecting optical device from the coloured light synthesizer with the S polarization state, and second coloured light penetrates and projects on the screen by projecting optical device from the coloured light synthesizer with the P polarization state.
From a structural point, existing rear-projection TV comprises casing, screen, photo engine (comprising projection-type liquid crystal photo engine, reflection type liquid crystal photo engine and DLP photo engine), speculum, circuit board and cooling mechanism.Cooling mechanism comprises radiator fan and air channel.Rear-projection TV can produce a large amount of heat in the course of the work, and heat is mainly derived from bulb, the energy of bulb is except that a part becomes luminous energy, major part is distributed in rear-projection TV with the form of heat energy, and in addition, the optical element in the photo engine also can absorb a part of impervious light and generate heat.These heats such as untimely leaving can have a strong impact on the operate as normal and the useful life of rear-projection TV.Therefore in rear-projection TV, all be provided with cooling mechanism, be used for the heat that the course of work produces is in time left, this cooling mechanism generally comprises many fans that vary in size and corresponding wind channels.But when rear-projection TV in use sudden power took place, radiator fan stopped operating suddenly, and heat can't in time shed in the machine, easily causes valuable parts damages.
Summary of the invention
Purpose of the present invention provides a kind of rear-projection TV with power-off protection exactly in order to address the above problem.
The object of the present invention is achieved like this: a kind of rear-projection TV with power-off protection; comprise housing and be arranged on housing interior photo engine, circuit board, apparatus for lighting up, light source, radiator fan, speculum and power supply, it is characterized in that: also comprise in the described rear-projection TV with the power-off protecting circuit of electric capacity as energy-storage travelling wave tube.
Described power-off protecting circuit comprises electric capacity, two diodes, current-limiting resistance, control signal, power supply and radiator fans.
Two diode reverse are connected in parallel in the described power-off protecting circuit; one end connects power supply; control signal and radiator fan; the other end connects storage capacitor; two branch roads of parallel circuits constitute charge circuit and discharge loop respectively; be connected to current-limiting resistance in the charge circuit; the protection diode operation; when the rear-projection TV operate as normal; control signal is sent instruction, and power supply is directly to radiator fan power supply, the diode current flow of charge circuit simultaneously; charge to storage capacitor; when the rear-projection TV sudden power, power supply is stopped power supply, and storage capacitor provides power supply by the diode of discharge loop to radiator fan.
The discharge loop of described storage capacitor when normal ac dump not to the radiator fan power supply, by power supply under the control of control signal to the radiator fan power supply, finish until heat radiation.
Compared with prior art; the rear-projection TV of band power-off protecting circuit of the present invention has adopted farad level storage capacitor to form power-off protecting circuit; radiator fan works on after can guaranteeing accident power-off, in time dispels the heat, and has prolonged the useful life of valuable device in rear-projection TV and the machine.
Description of drawings
Fig. 1 is the lateral plan (not containing light source) of a kind of rear-projection TV with power-off protection of the present invention.
Fig. 2 is the back view of a kind of rear-projection TV with power-off protection of the present invention.
Fig. 3 is the circuit theory diagrams of power-off protecting circuit of the present invention.
Embodiment
Referring to Fig. 1; Fig. 2; a kind of rear-projection TV of the present invention with power-off protection; comprise housing 1 and be arranged on housing interior photo engine 2, circuit board 3, apparatus for lighting up and light source 4, radiator fan 5, speculum 7 and power supply 8, also comprise in the described rear-projection TV with the power-off protecting circuit 6 of electric capacity as energy-storage travelling wave tube.
Referring to Fig. 3, power-off protecting circuit of the present invention comprises electric capacity 1 ', two diodes 2 ', 3 ', current-limiting resistance 4 ', control signal 5 ', power supply 8 and radiator fans 5.Two diodes 2 ' in the described power-off protecting circuit; 3 ' reverse parallel connection connects; one end connects power supply 8; control signal 5 ' and radiator fan 5; the other end connects storage capacitor 1 '; two branch roads of parallel circuits constitute charge circuit and discharge loop respectively; be connected to current-limiting resistance 4 ' in the charge circuit; 3 ' the work of protection diode; when the rear-projection TV operate as normal; control signal 5 ' is sent instruction; power supply 8 is directly to radiator fan 5 power supplies; diode 3 ' the conducting of charge circuit simultaneously; to storage capacitor 1 ' charging; when the rear-projection TV sudden power, power supply 8 is stopped power supply, and storage capacitor 1 ' provides power supply by the diode 2 ' of discharge loop to radiator fan 5.The discharge loop of storage capacitor 1 ' when normal ac dump not to radiator fan 5 power supplies, by power supply 8 under the control of control signal 5 ' to radiator fan 5 power supplies, finish until heat radiation.
Claims (4)
1. rear-projection TV with power-off protection; comprise housing and be arranged on housing interior photo engine, circuit board, apparatus for lighting up, light source, radiator fan, speculum and power supply, it is characterized in that: also comprise in the described rear-projection TV with the power-off protecting circuit of electric capacity as energy-storage travelling wave tube.
2. a kind of rear-projection TV with power-off protection according to claim 1 is characterized in that: described power-off protecting circuit comprises electric capacity, two diodes, current-limiting resistance, control signal, power supply and radiator fans.
3. a kind of rear-projection TV according to claim 1 and 2 with power-off protection; it is characterized in that: two diode reverse are connected in parallel in the described power-off protecting circuit; one end connects power supply; control signal and radiator fan; the other end connects storage capacitor; two branch roads of parallel circuits constitute charge circuit and discharge loop respectively; be connected to current-limiting resistance in the charge circuit; the protection diode operation; when the rear-projection TV operate as normal; control signal is sent instruction; power supply is directly powered to radiator fan; the diode current flow of charge circuit charges to storage capacitor, when the rear-projection TV sudden power simultaneously; power supply is stopped power supply, and storage capacitor provides power supply by the diode of discharge loop to radiator fan.
4. a kind of rear-projection TV according to claim 1 with power-off protection; it is characterized in that: the discharge loop of described storage capacitor is not powered to radiator fan when normal ac dump; power to radiator fan under the control of control signal by power supply, finish until heat radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024437 CN101035230A (en) | 2006-03-07 | 2006-03-07 | Back projection TV with the cut-off protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024437 CN101035230A (en) | 2006-03-07 | 2006-03-07 | Back projection TV with the cut-off protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101035230A true CN101035230A (en) | 2007-09-12 |
Family
ID=38731496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610024437 Pending CN101035230A (en) | 2006-03-07 | 2006-03-07 | Back projection TV with the cut-off protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101035230A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101489071B (en) * | 2008-01-15 | 2010-09-29 | 深圳市科创数字显示技术有限公司 | System for preventing optical projection television from abnormal shutdown and implementing method thereof |
| CN101340077B (en) * | 2008-08-12 | 2010-11-03 | 深圳雅图数字视频技术有限公司 | Power-off protection circuit of optical display television |
-
2006
- 2006-03-07 CN CN 200610024437 patent/CN101035230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101489071B (en) * | 2008-01-15 | 2010-09-29 | 深圳市科创数字显示技术有限公司 | System for preventing optical projection television from abnormal shutdown and implementing method thereof |
| CN101340077B (en) * | 2008-08-12 | 2010-11-03 | 深圳雅图数字视频技术有限公司 | Power-off protection circuit of optical display television |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |