CN101034244A - Projector with power-off protection - Google Patents
Projector with power-off protection Download PDFInfo
- Publication number
- CN101034244A CN101034244A CN 200610024432 CN200610024432A CN101034244A CN 101034244 A CN101034244 A CN 101034244A CN 200610024432 CN200610024432 CN 200610024432 CN 200610024432 A CN200610024432 A CN 200610024432A CN 101034244 A CN101034244 A CN 101034244A
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- power
- projector
- protection
- power supply
- radiator fan
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Abstract
The invention provides a projector with power-off protection, comprising: casing as well as light engine, circuit board, lighter, light source and heat radiation fan arranged in the casing, where the circuit board also comprises a power-off protection circuit using capacitors as energy storage components. As compared with the existing techniques, it adopts farad-grade capacitors to compose a power-off protection circuit so that the charge storage capacity is high. When it is power-off suddenly in use, the power-off protection circuit instantly starts and supplies power to the heat radiation fan to discharge internal heat in time, so as to effectively protect inside parts.
Description
Technical field
The present invention relates to a kind of projector, relate in particular to a kind of projector with power-off protection.
Background technology
Projector is widely used in education, commerce and the family.Common projector generally comprises a housing and is arranged on the interior photo engine of housing, circuit board, apparatus for lighting up, light source and corresponding cooling mechanism.According to what of camera lens used in the photo engine, projector can be divided into single-lens projector and tri-lens projector again.Generally all be that the white light that earlier a light source is produced is isolated red, green, blue three coloured light in design, by three liquid crystal light valves three coloured light are modulated respectively, three coloured light after the modulation are handled with diverse ways according to different mining single-lens or the three-lens design.In single-lens projector, be with closing that color component is synthesized and by the single lens projection imaging with three coloured light.In tri-lens projector, be that three coloured light are projected to imaging on the same screen via three different camera lenses respectively.Wherein single-lens projector has the advantages that volume is little, be convenient for carrying, but its back focal length is longer, thereby limited ability at the bigger picture of short distance inner projection, and optical modules such as employed camera lens and spectroscope are very high to the requirement of quality, precision, cause cost higher.And tri-lens projector can project big picture in than short distance, and picture brightness and contrast all improve a lot than single-lens projector.
Projector 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 projector 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 serviceable life of projector.Therefore in projector, 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, and the air outlet of cooling mechanism is arranged on a side of housing.When projector 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 projector 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 projector with power-off protection; comprise housing and be arranged on housing interior photo engine, circuit board, apparatus for lighting up, light source and radiator fan, it is characterized in that: also comprise in the described circuit board 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 circuit constitute charge circuit and discharge loop respectively; be connected to current-limiting resistance in the charge circuit; the protection diode operation; when projector's 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 projector's sudden power, power supply quits work, 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 projector of band power-off protecting circuit of the present invention has adopted farad level storage capacitor to form power-off protecting circuit, and the accumulate capacity is big.When projector in use sudden power took place, this power-off protecting circuit moment started and to the radiator fan power supply, in time discharges heat in the machine, has effectively protected the machine inner part.
Description of drawings
Fig. 1 is a kind of projector architecture synoptic diagram with power-off protection of the present invention.
Fig. 2 is the circuit theory diagrams of power-off protecting circuit of the present invention.
Embodiment
Referring to Fig. 1; a kind of projector 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 7, light source 4 and radiator fan 5, also comprise in the described circuit board with the power-off protecting circuit 6 of electric capacity as energy-storage travelling wave tube.
Referring to Fig. 2, 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 6 ' and radiator fans 5.Two diodes 2 ' in the described power-off protecting circuit; 3 ' reverse parallel connection connects; one end connects power supply 6 '; control signal 5 ' and radiator fan 5; the other end connects storage capacitor 1 '; two branch roads of parallel circuit 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 projector's operate as normal; control signal 5 ' is sent instruction; power supply 6 ' is directly to radiator fan 5 power supplies; diode 3 ' the conducting of charge circuit simultaneously; to storage capacitor 1 ' charging; when projector's sudden power, power supply 6 ' quits work, 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 6 ' under the control of control signal 5 ' to radiator fan 5 power supplies, finish until heat radiation.
Claims (4)
1. the projector with power-off protection comprises housing and is arranged on housing interior photo engine, circuit board, apparatus for lighting up, light source and radiator fan, it is characterized in that: also comprise in the described circuit board with the power-off protecting circuit of electric capacity as energy-storage travelling wave tube.
2. a kind of projector 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 projector 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 circuit constitute charge circuit and discharge loop respectively; be connected to current-limiting resistance in the charge circuit; the protection diode operation; when projector's 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 projector's sudden power simultaneously; power supply quits work, and storage capacitor provides power supply by the diode of discharge loop to radiator fan.
4. a kind of projector 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 200610024432 CN101034244A (en) | 2006-03-07 | 2006-03-07 | Projector with power-off protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024432 CN101034244A (en) | 2006-03-07 | 2006-03-07 | Projector with power-off protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101034244A true CN101034244A (en) | 2007-09-12 |
Family
ID=38730850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610024432 Pending CN101034244A (en) | 2006-03-07 | 2006-03-07 | Projector with power-off protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101034244A (en) |
-
2006
- 2006-03-07 CN CN 200610024432 patent/CN101034244A/en active Pending
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Legal Events
| 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 |