CN102438375B - LED (Light Emitting Diode) driving system for mini projector - Google Patents
LED (Light Emitting Diode) driving system for mini projector Download PDFInfo
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- CN102438375B CN102438375B CN201110427142.2A CN201110427142A CN102438375B CN 102438375 B CN102438375 B CN 102438375B CN 201110427142 A CN201110427142 A CN 201110427142A CN 102438375 B CN102438375 B CN 102438375B
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Abstract
The invention relates to the technology of the projector and provides an LED (Light Emitting Diode) driving system for a mini projector for solving the problem that no method is available for the conventional mini projectors to effectively control the power consumption of the LED light. according to the technical scheme of the LED driving system for a mini projector, a processor and a power module are connected; an ambient light sensor is connected with the processor; a storage module is connected with the processor; the processor and a display control and LED driving time sequence control module are respectively connected with the input end of an AND gate; and the output end of the AND gate is connected with an LED constant-current driving module. The LED driving system has the beneficial effect that the output power of the LED light is controllable, and the LED driving system is suitable for the mini projector.
Description
Technical field
The present invention relates to projector's technology, particularly micro projection machine technology.
Background technology
Minitype projection machine technical development is in recent years swift and violent, DLP, the product lines such as LCOS have been released one after another and have been applicable to hand-held pocket-type minitype projection machine product (PICO), or be built in the handheld mobile devices such as mobile phone, they generally adopt lithium battery power supply, user is easy to use, but because lithium battery capacity is limited, and the power consumption of light source led lamp is very large in minitype projection machine, if like this LED lamp power consumption is not controlled, electric weight in very fast battery will be consumed totally, affect user's use, and present minitype projection machine does not all have effectively to control the method for LED lamp power consumption.In present minitype projection machine, the system block diagram of LED drive system as shown in Figure 1, it generally comprises LED constant-current driven module, LED lamp module, shows and control and LED driving time-sequence control module and power module, described power module is connected with LED constant-current driven module, LED constant-current driven module is connected with LED lamp module, showing to control with LED drives time-sequence control module to be connected with LED constant-current driven module, wherein, power module adopts lithium battery power supply.
Summary of the invention
The object of the invention is to overcome current minitype projection machine does not all have effectively to control the shortcoming of the method for LED lamp power consumption, and a kind of minitype projection machine LED drive system is provided.
The present invention solves its technical problem, the technical scheme adopting is, minitype projection machine LED drive system, comprise LED constant-current driven module, LED lamp module, show and control and LED driving time-sequence control module and power module, it is characterized in that, also comprise processor, ambient light sensor, with door and memory module, described processor is connected with power module, ambient light sensor is connected with processor, memory module is connected with processor, processor and demonstration are controlled and LED drives time-sequence control module to be connected respectively with the input of door, be connected with LED constant-current driven module with the output of door,
Described processor is for detection of power module output voltage and temperature, and the surround lighting parameter of reception environment optical sensor input, outputs to and door according to the state information control of storing in memory module;
Described ambient light sensor is for detection of surround lighting, and the surround lighting parameter detecting is transferred to processor;
Described memory module is for storing the state information under different electrical power module status.
Concrete, described processor is single-chip microcomputer.
Further, described processor is controlled and LED driving time-sequence control module for showing.
Concrete, described memory module adopts erasable memory.
Further, described state information comprises LED power setting and the selected pattern of user.
Concrete, described processor is to exporting PWM square wave with door.
Further, described LED constant-current driven module adopts the LED constant current drive integrated circult that has the LED constant current drive integrated circult of PWM light modulation or have high-speed switch.
Concrete, described power module adopts lithium battery to power.
The invention has the beneficial effects as follows, by above-mentioned minitype projection machine LED drive system, according to output voltage of the detection of surround lighting and power module etc., state information control processor by storage to the output of door, and then by showing that with gate control control and LED drive time-sequence control module to export to LED constant-current driven module, thereby control the power of LED lamp in LED lamp module, reach the effect of controlling LED lamp power, save electric power, user is lengthened service time.
Brief description of the drawings
Fig. 1 is the system block diagram of LED drive system in present minitype projection machine;
Fig. 2 is the system block diagram of embodiment of the present invention minitype projection machine LED drive system.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
Minitype projection machine LED drive system of the present invention is by LED constant-current driven module, LED lamp module, show and control and LED driving time-sequence control module, power module, processor, ambient light sensor, with door and memory module composition, wherein, processor is connected with power module, ambient light sensor is connected with processor, memory module is connected with processor, processor and demonstration are controlled and LED drives time-sequence control module to be connected respectively with the input of door, be connected with LED constant-current driven module with the output of door, here, processor is for detection of power module output voltage and temperature, the surround lighting parameter of reception environment optical sensor input, output to and door according to the state information control of storing in memory module, ambient light sensor is for detection of surround lighting, and the surround lighting parameter detecting is transferred to processor, memory module is for storing the state information under different electrical power module status.
Embodiment
The processor adopting single-chip microcomputer that this is routine, its system block diagram is referring to Fig. 2.
First by LED constant-current driven module, LED lamp module, show and control and LED driving time-sequence control module, power module, processor, ambient light sensor, form this routine described minitype projection machine LED drive system with door and memory module, wherein, processor is connected with power module, ambient light sensor is connected with processor, memory module is connected with processor, processor and demonstration are controlled and LED drives time-sequence control module to be connected respectively with the input of door, be connected with LED constant-current driven module with the output of door, here, processor is for detection of power module output voltage and temperature, the surround lighting parameter of reception environment optical sensor input, output to and the PWM square wave of door according to the state information control of storing in memory module, ambient light sensor is for detection of surround lighting, and the surround lighting parameter detecting is transferred to processor, memory module adopts erasable memory, it is for storing under different battery statuss, the state informations such as the selected pattern of LED power setting and user, and this memory module can with former Miniature projector system in scratch pad memory integrate, save the cost of whole product, LED constant-current driven module adopts the LED constant current drive integrated circult that has the LED constant current drive integrated circult of PWM light modulation or have high-speed switch, power module adopts lithium battery to power.
Processor can adopt single single-chip microcomputer, also can directly adopt and show that control and LED drive time-sequence control module, further save cost.
When operation, ambient light sensor is transferred to processor the surround lighting parameter detecting, simultaneous processor also will detect the output voltage of power module, according to the information obtaining, control the PWM of output, setting 100% duty ratio is without falling power mode, 0% duty ratio is for turn-offing LED pattern, processor with show control and LED drive the PWM process of time-sequence control module output with behind the door, output to LED constant-current driven module, so just can control LED lamp in the LED lamp module electric current under conducting state.
Complete machine can also arrange several mode of operations:
One, surround lighting automatic mode: adopt larger power stage in the time of the brighter environment of surround lighting, the time that user uses is like this just shorter; In the situation that surround lighting is darker, adopt lower power stage, the time that battery maintains is like this just long.
Two, battery automatic mode: because the nonlinear characteristic of the electric discharge of lithium battery, in the time that battery electric quantity is more sufficient, can suitably improve discharging current, suitably reduce electric current in the time that electric weight declines, can have so a relatively long service time; As a rule, the normal voltage in single-lithium-battery pond is 3.7V, has just been full of after electricity at lithium battery, and voltage can reach 4.2V, fully, after electric discharge, when voltage drop is to 3V left and right (seeing that the design of battery, different batteries arrange difference), has exported with regard to no current.And lithium battery electric discharge is divided into 3 stages: at the initial stage of 1. discharging, voltage drop is very fast; 2. after, discharge curve tends towards stability, and enters " platform area " and 3. discharges latter stage, and voltage is the state of fast-descending.So can, according to the characteristic of battery, at the different discharge regimes of battery, design different discharging currents, reach the object extending working time.
Three, manual mode: the power output that user can fixed L ED lamp.
And now a lot of batteries are all with temperature feedback, in order to ensure the fail safe of complete machine, when after the temperature alarming of battery feedback, turn-off the output of LED lamp.
Claims (7)
1. minitype projection machine LED drive system, comprise LED constant-current driven module, LED lamp module, show and control and LED driving time-sequence control module and power module, it is characterized in that, also comprise processor, ambient light sensor, with door and memory module, described processor is connected with power module, ambient light sensor is connected with processor, memory module is connected with processor, processor and demonstration are controlled and LED drives time-sequence control module to be connected respectively with the input of door, be connected with LED constant-current driven module with the output of door
Described processor is for detection of power module output voltage and temperature, the surround lighting parameter of reception environment optical sensor input, output to and door according to the state information control of storing in memory module, described state information comprises LED power setting and the selected pattern of user;
Described ambient light sensor is for detection of surround lighting, and the surround lighting parameter detecting is transferred to processor;
Described memory module is for storing the state information under different electrical power module status.
2. minitype projection machine LED drive system according to claim 1, is characterized in that, described processor is single-chip microcomputer.
3. minitype projection machine LED drive system according to claim 1, is characterized in that, described processor is controlled and LED driving time-sequence control module for showing.
4. minitype projection machine LED drive system according to claim 1, is characterized in that, described memory module adopts erasable memory.
5. minitype projection machine LED drive system according to claim 1, is characterized in that, described processor to door output PWM square wave.
6. minitype projection machine LED drive system according to claim 5, is characterized in that, described LED constant-current driven module adopts the LED constant current drive integrated circult that has the LED constant current drive integrated circult of PWM light modulation or have high-speed switch.
7. according to minitype projection machine LED drive system described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that, described power module adopts lithium battery to power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110427142.2A CN102438375B (en) | 2011-12-19 | 2011-12-19 | LED (Light Emitting Diode) driving system for mini projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110427142.2A CN102438375B (en) | 2011-12-19 | 2011-12-19 | LED (Light Emitting Diode) driving system for mini projector |
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| Publication Number | Publication Date |
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| CN102438375A CN102438375A (en) | 2012-05-02 |
| CN102438375B true CN102438375B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110427142.2A Expired - Fee Related CN102438375B (en) | 2011-12-19 | 2011-12-19 | LED (Light Emitting Diode) driving system for mini projector |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698282B (en) * | 2013-12-23 | 2016-03-16 | 南京农业大学 | A kind of modulation LED light source driving circuit for plant growth information monitoring |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4107266B2 (en) * | 2004-06-11 | 2008-06-25 | セイコーエプソン株式会社 | Display device and dimming method thereof |
| ES2375807T3 (en) * | 2007-12-31 | 2012-03-06 | Koninklijke Philips Electronics N.V. | METHODS AND APPLIANCES TO FACILITATE THE DESIGN, SELECTION AND / OR CUSTOMIZATION OF LIGHTING EFFECTS OR LIGHTING CULTS. |
| JP5493324B2 (en) * | 2008-09-30 | 2014-05-14 | カシオ計算機株式会社 | Electronics |
| JP4710987B2 (en) * | 2009-02-06 | 2011-06-29 | セイコーエプソン株式会社 | projector |
| CN201539771U (en) * | 2009-07-27 | 2010-08-04 | 许崇良 | LED light source for projection machine |
| CN102056370A (en) * | 2009-10-30 | 2011-05-11 | 捷扬光电股份有限公司 | Light source electric power control method and system for projector using light-emitting diode light source |
| JP2011222409A (en) * | 2010-04-13 | 2011-11-04 | Might Industry Co Ltd | Lithium ion battery pack, power supply device using the same, and battery floodlight |
| CN201986209U (en) * | 2010-11-16 | 2011-09-21 | 杭州瑞德光电有限公司 | Solar energy corridor lighting and power-supply system |
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