CN201689263U - Portable LCOS projector with overheat protection function - Google Patents
Portable LCOS projector with overheat protection function Download PDFInfo
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- CN201689263U CN201689263U CN2010201253033U CN201020125303U CN201689263U CN 201689263 U CN201689263 U CN 201689263U CN 2010201253033 U CN2010201253033 U CN 2010201253033U CN 201020125303 U CN201020125303 U CN 201020125303U CN 201689263 U CN201689263 U CN 201689263U
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Abstract
The utility model discloses a portable LCOS projector with an overheat protection function. Two fans for heat dissipation are installed inside the projector. The projector is characterized in that a fan rotation speed identification circuit module is installed on each fan, a signal output end of the fan rotation speed identification circuit module is connected with a fan rotation speed signal input end of a master control MCU of the portable LCOS projector in a corresponding manner, a control signal output end of the master control MCU of the portable LCOS projector is connected with a signal input end of an LED constant current source, and a state indication signal output end of the LED constant current source is connected with an LED state indication lamp. The projector adopts resources of the master MCU to detect rotation speed of the fans, realizes fan state monitoring and integral overheat protection, has simple structure and low cost, and prolongs service life of the projector.
Description
Technical field
The utility model relates to a kind of portable LCOS projector, relates in particular to a kind of portable LCOS projector with overtemperature prote function, belongs to the production field of projector.
Background technology
LCOS (Liquid Crystal on Silicon) belongs to novel reflective micro LCD shadow casting technique, and its adopts and scribbles the substrate of the CMOS integrated circuit (IC) chip of liquid crystal silicon as reflective LCD.Polish the back plated aluminum with advanced technologies and be used as catoptron, form the CMOS substrate, then CMOS substrate and the glass substrate that contains on the transparency electrode are fitted, the packaging liquid crystal of reinjecting forms.
Portable LCOS projector is as a kind of giant-screen picture reproducer that can carry, and it is used more and more widely.Manufacturer of domestic portable LCOS projector is also in continuous emergence.The application of this brand-new picture reproducer makes large screen display and the splendid portability of product be able to perfect adaptation.
Along with the raising of the output brightness of portable LCOS projector, the also corresponding raising of its power.And led light source is very responsive to temperature, and is heavy then cause LED to burn in case overtemperature gently then causes led light source aging, even the distortion of complete machine casing, the initiation major accident.
Existing portable LCOS projector not have specially more not have the special overtemperature protection device that causes unusually at blower fan, and the overtemperature result of projector to be caused by rotation speed of fan decline or stall mainly at the protective device of abnormal high temperature.
Summary of the invention
The purpose of this utility model just is to provide in order to address the above problem a kind of portable LCOS projector with overtemperature prote function.
To achieve these goals, the utility model has adopted following technical scheme:
In the utility model, two blower fans that are used to dispel the heat are installed in projector, its innovation part is: a rotation speed of fan identification circuit module is installed on each blower fan, the corresponding connection of rotation speed of fan signal input part of the signal output part of rotation speed of fan identification circuit module and the main control MCU of portable LCOS projector, the control signal output ends of the main control MCU of portable LCOS projector is connected with the signal input part of LED constant current source, and the condition indicative signal output terminal of LED constant current source is connected with the led state pilot lamp.
Comprise the rotation speed of fan signal transformation circuit in the rotation speed of fan identification circuit module, the tach signal of blower fan output is shaped as the standard square wave with certain frequency, and the frequency of its square wave has just been represented the actual speed of blower fan.In main control MCU software, increase the dynamic pulse tally function then, calculate the frequency of blower fan output square wave, draw the actual speed of blower fan thus.In case rotating speed is lower than preset value, the output of LED constant current source is then closed in perhaps stall at once, and status indicator lamp is set to red flicker, changes holding state then over to, reaches the purpose that the overtemperature that causes because of fan trouble is protected.
As further improvement of the utility model, be pasted with a temperature kick switch respectively on the blue led heating radiator of portable LCOS projector and green LED heating radiator, the temperature signal output terminal of temperature kick switch is connected with the temperature signal input end of LED constant current source.
If the blower fan abnormal occurrence appears failing unusually to detect in main control loop; the temperature of LED heating radiator will continue to raise; in case when arriving 75 ℃ of the threshold values of temperature kick switch; temperature kick switch on blue led heating radiator and the green LED heating radiator will move at once; the function pin voltage of LED constant current source is forced to drag down; close led light source thus by force, reach the purpose of protection.
The beneficial effects of the utility model are:
The utility model utilizes the resource of main control MCU to carry out rotation speed of fan and detects, and has realized fan condition monitoring and complete machine overtemperature prote, and is simple in structure, with low cost; Simultaneously on the blue led heating radiator of portable LCOS projector and green LED heating radiator, mount temperature kick switch respectively, further strengthened the reliability of complete machine protection, even main control loop occurs unusual, also can implement protection by the kick switch, the risk that allows LED the overtemperature damage occur drops to minimum; Dual overtemperature prote of the present utility model has almost been stopped the drawback of Yin Gaowen damage led light source, has prolonged the life-span of projector.
Description of drawings
Fig. 1 is a circuit structure block scheme of the present utility model;
Fig. 2 is the mounting structure synoptic diagram of temperature kick switch in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described in detail:
As shown in Figure 1, in the utility model, two blower fans that are used to dispel the heat are installed in projector, a rotation speed of fan identification circuit module (physical construction is not visible in the drawings) is installed on each blower fan, the corresponding connection of rotation speed of fan signal input part of the signal output part of rotation speed of fan identification circuit module and the main control MCU of portable LCOS projector, the control signal output ends of the main control MCU of portable LCOS projector is connected with the signal input part of LED constant current source, and the condition indicative signal output terminal of LED constant current source is connected with the led state pilot lamp.
As shown in Figure 2, on the blue led heating radiator 1 of portable LCOS projector 4 and green LED heating radiator 2, be pasted with a temperature kick switch 3 respectively, in conjunction with Fig. 1 and Fig. 2, the temperature signal output terminal of temperature kick switch 3 is connected with the temperature signal input end of LED constant current source.
In conjunction with Fig. 1, comprise the rotation speed of fan signal transformation circuit in the rotation speed of fan identification circuit module, the tach signal of blower fan output is shaped as the standard square wave with certain frequency, and the frequency of its square wave has just been represented the actual speed of blower fan.In main control MCU software, increase the dynamic pulse tally function then, calculate the frequency of blower fan output square wave, draw the actual speed of blower fan thus.In case rotating speed is lower than preset value, the output of LED constant current source is then closed in perhaps stall at once, and status indicator lamp is set to red flicker, changes holding state then over to, reaches the purpose that the overtemperature that causes because of fan trouble is protected.
In conjunction with Fig. 1 and Fig. 2, after powering on, the complete machine normal initialization, main control MCU control blower fan rotates.Start rotation speed of fan then and detect, rotation speed of fan is normal, then send the signal of lighting a lamp to light led light source, and complete machine enters normal operating conditions.At any time detection of dynamic rotation speed of fan in case find that rotating speed is unusual, is then controlled the LED constant current source at once and is closed led light source in the course of the work, puts the led state pilot lamp and is red flicker, and enter holding state; If the blower fan abnormal occurrence appears failing unusually to detect in main control loop; the temperature of LED heating radiator will continue to raise; in case when arriving 75 ℃ of the threshold values of temperature kick switch 3; temperature kick switch 3 on blue led heating radiator and the green LED heating radiator will move at once; the function pin voltage of LED constant current source is forced to drag down; close led light source thus by force, reach the purpose of protection.
Claims (2)
1. portable LCOS projector with overtemperature prote function; two blower fans that are used to dispel the heat are installed in projector; it is characterized in that: a rotation speed of fan identification circuit module is installed on each blower fan; the corresponding connection of rotation speed of fan signal input part of the signal output part of rotation speed of fan identification circuit module and the main control MCU of portable LCOS projector; the control signal output ends of the main control MCU of portable LCOS projector is connected with the signal input part of LED constant current source, and the condition indicative signal output terminal of LED constant current source is connected with the led state pilot lamp.
2. the portable LCOS projector with overtemperature prote function according to claim 1; it is characterized in that: be pasted with a temperature kick switch respectively on the blue led heating radiator of portable LCOS projector and green LED heating radiator, the temperature signal output terminal of temperature kick switch is connected with the temperature signal input end of LED constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201253033U CN201689263U (en) | 2010-03-08 | 2010-03-08 | Portable LCOS projector with overheat protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201253033U CN201689263U (en) | 2010-03-08 | 2010-03-08 | Portable LCOS projector with overheat protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201689263U true CN201689263U (en) | 2010-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201253033U Expired - Fee Related CN201689263U (en) | 2010-03-08 | 2010-03-08 | Portable LCOS projector with overheat protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201689263U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866571A (en) * | 2012-07-23 | 2013-01-09 | 苏州佳世达光电有限公司 | Light source system |
| CN111580326A (en) * | 2019-02-18 | 2020-08-25 | 佳能株式会社 | Illumination device for suppressing excessive temperature rise of light emitting section, control method therefor, and image pickup apparatus |
| CN111736413A (en) * | 2019-03-25 | 2020-10-02 | 卡西欧计算机株式会社 | Electronic device, projection device, and cooling control method |
-
2010
- 2010-03-08 CN CN2010201253033U patent/CN201689263U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866571A (en) * | 2012-07-23 | 2013-01-09 | 苏州佳世达光电有限公司 | Light source system |
| CN102866571B (en) * | 2012-07-23 | 2015-04-29 | 苏州佳世达光电有限公司 | Light source system |
| CN111580326A (en) * | 2019-02-18 | 2020-08-25 | 佳能株式会社 | Illumination device for suppressing excessive temperature rise of light emitting section, control method therefor, and image pickup apparatus |
| JP2020134653A (en) * | 2019-02-18 | 2020-08-31 | キヤノン株式会社 | Lighting system, control method for the same and imaging device |
| US11500268B2 (en) | 2019-02-18 | 2022-11-15 | Canon Kabushiki Kaisha | Lighting device that suppresses excessive temperature rise of light emission section, method of controlling same, and image capture apparatus |
| JP7258589B2 (en) | 2019-02-18 | 2023-04-17 | キヤノン株式会社 | Lighting device and its control method, imaging device |
| CN111736413A (en) * | 2019-03-25 | 2020-10-02 | 卡西欧计算机株式会社 | Electronic device, projection device, and cooling control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20180308 |
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| CF01 | Termination of patent right due to non-payment of annual fee |