CN102056370A - Light source electric power control method and system for projector using light-emitting diode light source - Google Patents
Light source electric power control method and system for projector using light-emitting diode light source Download PDFInfo
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- CN102056370A CN102056370A CN2009102094727A CN200910209472A CN102056370A CN 102056370 A CN102056370 A CN 102056370A CN 2009102094727 A CN2009102094727 A CN 2009102094727A CN 200910209472 A CN200910209472 A CN 200910209472A CN 102056370 A CN102056370 A CN 102056370A
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Abstract
The invention provides an electric power control method for a projector with a light-emitting diode light source, which comprises the following steps of: setting the maximum output voltage of a switching type power supply to a light-emitting diode driver to obtain the operating voltage of a light-emitting diode; and adjusting the output to the voltage of the light-emitting diode driver appropriately.
Description
Technical field
The present invention relates to a kind of projector, particularly a kind of power-supply system and its control method of using light-emitting diode as the projector of light source.
Background technology
See also Fig. 1, be the schematic diagram of existing LED source projector.Existing LED source projector, its power supply is usually promptly from domestic power supply, as wall power AC (alternating current), and gives the transformation rectification through power supply unit 2, uses for equipment all in the projector.The powerup issue about light-emitting diode is only discussed in this case, therefore the part of power supply unit 2 output powers to driver 3 only is discussed, and other parts are not considered.And power supply unit 2 has the function of transformation usually, is generally step-down; The function that also may have rectification, voltage stabilizing in addition.Wall power AC is output to power supply unit 2, and power supply unit 2 is exported supply voltage v1 to a driver 3 again after treatment, and driver 3 is to be responsible for driving a light-emitting diode 4, so driver 3 is also exported a drive current A to light-emitting diode 4.The Lights section of a projector like this can operate.
Yet; the manufacturing of light-emitting diode 4 has a little error; therefore make the operating voltage of each light-emitting diode all be not quite similar; there have height to have to be low; so prior art is up to minimum operating voltage in order to contain; usually can allow the higher supply voltage v1 of power supply unit 2 output one to driver 3; usually this supply voltage v1 exceeds the magnitude of voltage that light-emitting diode can bear and has 1/3rd amplitude; therefore; when driver 3 carry out when producing the work of deciding electric current and output driving current A to light-emitting diode 4; and the appearance of an operating voltage v2 is just arranged naturally; yet between operating voltage v2 and the supply voltage v1 some gaps are arranged; this shows; driver 3 has absorbed both pressure reduction; for the voltage of exorbitant expenditure, driver 3 can be in the mode of heat energy with too much power consumption, and its side effect be exactly produce high hot and cause the waste of electric power.
The whence is event, and the applicant is because the disappearance of prior art is invented out this case " the projector's electrical control method and the system of LED source ", in order to improve the disappearance of above-mentioned existing means.
Summary of the invention
The objective of the invention is to solve the power consumption problem of light-emitting diode of using as the projector of light source, thereby solve this power consumption problem and reach another effect that reduces projector's heating, and then reduce the demand of projector, and whole power consumption is reduced for heat radiation function.
To achieve the above object, the invention provides a kind of light source power control method of using the projector of LED source, comprise the following steps: to provide a LED drive and a light-emitting diode; Output one supply voltage is to this LED drive, and this LED drive provides a drive current to this light-emitting diode; Obtain the operating voltage of this light-emitting diode; And adjust this supply voltage.
Aforesaid control method wherein should be supplied voltage, was supplied with by a power supply unit.
Aforesaid control method is wherein adjusted this supply voltage, is to control this power supply unit by a processor to reach.
Aforesaid control method more comprises a step: a processor is provided, is carried out by this processor and adjust this supply voltage.
Aforesaid control method, wherein this operating voltage is to obtain from this LED drive.
Aforesaid control method more comprises a step: a power supply unit is provided, is electrically connected with this processor and this LED drive, this power supply unit is in order to export this supply voltage to this LED drive.
Aforesaid control method, more comprise the following steps: to judge if export this supply voltage of this light-emitting diode to, greater than this operating voltage of this light-emitting diode add LED drive due pressure drop (voltage that is consumed) and, then should supply voltage and be reduced.
To achieve the above object, the invention provides a kind of light source power control system that uses the projector of LED source, comprise a power supply unit, produce a supply voltage; One LED drive is electrically connected to this power supply unit and accepts this supply voltage, and exports a drive current; And a processor, be electrically connected to this power supply unit and this LED drive, wherein, this processor is in order to change this supply voltage.
Foregoing control system, wherein this processor is to obtain a drive signal from this LED drive.
Foregoing control system, wherein this drive signal has the operating voltage of a light-emitting diode.
Foregoing control system, wherein this processor sends a control signal to this power supply unit.
Foregoing control system, wherein this control signal is carried the amplitude of this power supply unit to the required change of this supply voltage.
Foregoing control system, wherein this power supply unit more comprises a rectifier, is converted to direct current in order to the alternating current with power supply; One power factor (PF) corrector is in order to revise the galvanic power factor (PF) from this rectifier; One transformer will be reduced to the receptible magnitude of voltage of this LED drive from the magnitude of voltage of this power factor (PF) corrector; And a digital analog converter, be electrically connected with this transformer, with this control signal that this processor produces, be converted to a control voltage, deliver to this transformer again, and make this supply voltage change.
Foregoing control system, wherein this LED drive more comprises a voltage current adapter (Voltage to Current Converter), is electrically connected with this power supply unit, should supply voltage and be adjusted to this drive current; And a driver control circuit, be electrically connected and transmit a drive signal with this processor and give this processor; And be electrically connected to obtain the operating voltage of light-emitting diode with voltage current adapter.And this drive signal is the operating voltage of light-emitting diode.
Description of drawings
Fig. 1 is the schematic diagram of existing LED source projector;
Fig. 2 is the control system schematic diagram of projector of the present invention;
Fig. 3 is the flow chart of control method of the present invention;
Fig. 4 is the circuit box schematic diagram of switched power supply of the present invention; And
Fig. 5 is the circuit box schematic diagram of light source power control of the present invention system.
[main element symbol description]
AC: wall power
10: power supply is provided
2: power supply unit
2 ': switched power supply
2 ' 0: transforming circuit
2 ' 1: rectifier (rectification circuit)
2 ' 2: the power factor (PF) corrector
2 ' 3: transformer (transforming circuit)
2 ' 4: the first digital analog converters
20: power supply unit is provided
3: driver
30: LED drive is provided
3 ': LED drive
3 ' 1: loop of power circuit
3 ' 10R: first voltage current adapter
3 ' 10G: second voltage current adapter
3 ' 10B: tertiary voltage current converter
3 ' 2: driver control circuit
4: light-emitting diode
40: light-emitting diode is provided
5: processor
5a: drive signal
5b: control signal
50: obtain the required voltage of this light-emitting diode
51: adjust the described voltage that exports this light-emitting diode to
A: drive current
A-R: first drive current
A-B: second drive current
A-G: the 3rd drive current
V1: supply voltage
V2: operating voltage
Vctrl: control voltage
Embodiment
Below be described at the preferred embodiment of the light source power control method and system of a kind of projector that uses LED source of the present invention, please refer to accompanying drawing, but actual configuration and the method that is adopted must not meet described content fully, those skilled in the art can make many variations and modification under the situation of practicalness that does not break away from this case and scope.
See also Fig. 2, be projector of the present invention and control system schematic diagram.Wherein basic framework remain by external power source, normally a domestic power supply or be called indoor power supply, wall power is powered to a power supply unit, through after the suitable processing, LED drive is given in normally step-down, rectification again, again electric power is delivered to light-emitting diode at last.But the present invention is in order to reach the purpose of control light source electric power, more increased by a processor 5, and the special switched power supply 2 ' (being called for short supply 2 ') that uses of power supply unit, supply with an alternating current AC by external power source and give supply 2 ', supply 2 ' then can change the output voltage of self, and export a supply voltage v1 and give LED drive 3 ', LED drive then is an information-based electronic equipment, equipment, output signal is informed the user mode of other elements with expression driver 3 ' itself in addition, therefore, control system of the present invention promptly is the driver 3 ' with signal output function, driver 3 ' is then for driven for emitting lights diode 4, the supply voltage v1 of supply 2 ' converted to decide electric current, and and then export a drive current A and come driven for emitting lights diode 4 luminous, therefore generation one operating voltage v2 between light-emitting diode 4 and driver 3 '.Again, driver 3 ' is to be electrically connected with processor 5, make processor 5 can receive drive signal 5a from driver 3 ', and processor 5 is promptly known in the driver 3 ' owing to carry out what step-down for output power to light-emitting diode 4, and purpose of the present invention promptly as described above, the first is in order to solve the power consumption problem of light-emitting diode as the projector of light source of using, and the power consumption of traditional driver is promptly too high because of supply voltage v1, make operating voltage v2 except the consumption of burden light-emitting diode 4 and driver 3 ', still have the part that exceeds, and light-emitting diode 4 needs is to decide electric current, therefore, driver 3 ' to be decided electric current and is passed through resistance adjustment in order to provide, to such an extent as to produced suitable heat, and this makes driver 3 ' produce high heat, except the life-span of reducing electronic component, and the infringement that causes for fear of high heat, then projector dispels the heat to driver with regard to also needing.Opposite, informationalized LED drive 3 ' of the present invention can inform whether processor 5 supply voltage v1 are too high, if too high, then 5 of processors reduce supply 2 ' by a control signal 5b and supply voltage v1.
This shows, set up a processor 5, and it is electrically connected to driver 3 ' and supply 2 ', make the supply voltage v1 of control LED power source supply 2 ' become possibility by the present invention.Also therefore, the supply voltage v1 that supply 2 ' is exported is through after the control of the present invention, be haply equal the totalling of the domestic demand voltage of driver 3 ' and operating voltage v2, promptly and.So the heat that driver 3 ' generated is heat naturally that generate with regard to the power consumption of self itself being born is only arranged, and do not have the heat that generates because supply voltage v1 is too high, also therefore reached another object of the present invention, promptly reach another effect that reduces projector's heating by solving the power consumption problem, also because heating problem is no longer perplexing the driver of projector, also make the demand that driver is dispelled the heat reduce, more can reduce the energy that consumes in addition because of heat radiation, be used for the radiator fan of driver as cancellation.Or simplify the design of the heat dissipation element of driver at least.Anyway, the present invention also can be because of the reduction of radiating requirements except reducing power consumption, and the lower heat dissipation element of use cost, that is further reduce the cost of projector.For terminal user, it promptly is a great inducement that the electricity charge reduce.
See also Fig. 3, be the flow chart of control method of the present invention.The step that wherein provides as after.At first provide power supply 10, usually this power supply is promptly from 110 volts or 220 volts voltage of domestic power supply, next step provides power supply unit 20, in order to power source voltage is given transformation, rectification, in order that making LED drive can move, step under connecing promptly provides LED drive 30, and its effect is to be the driven for emitting lights diode; A step provides light-emitting diode 40 once more, to this, promptly have electric current to export light-emitting diode to, and light-emitting diode 40 can be luminous, electric current puts on the light-emitting diode by just having voltage naturally, i.e. the operating voltage v2 of light-emitting diode 4 (please cooperate Fig. 2).Then a time step is to obtain the required voltage of this light-emitting diode 50, and after learning the required magnitude of voltage of light-emitting diode, the step under the present invention connects is to adjust the described voltage 51 that exports this light-emitting diode to.Because light-emitting diode is driven by driver, and the power source of driver is a power supply unit, so the step of aforementioned " adjusting the described voltage 51 that exports this light-emitting diode to " promptly is the output voltage that changes power supply unit, also is about to the described supply voltage of Fig. 2 v1 change.And the change of the supply voltage v1 of power supply unit action then is from a controller 5 operation of (please cooperate Fig. 2), provides the information of the voltage that itself exports this light-emitting diode to controller 5 as for whether adjusting supply voltage v1 by driver.
Fig. 3 provides more loaded down with trivial details flow chart, and in fact the light source power control method of the projector of use LED source provided by the present invention can be changed and become following three steps approximately: at first be output one driving voltage to a light-emitting diode; Obtain the required voltage of this light-emitting diode; And adjustment exports this driving voltage of this light-emitting diode to.
Further, at first, the step of above-mentioned " exporting driving voltage to a light-emitting diode " is to export a drive current by a LED drive to give a light-emitting diode, and a potential difference is promptly arranged between the two, is called operating voltage.Power source as for LED drive is supplied with by a power supply unit.Secondly, the step of above-mentioned " obtaining the required voltage of this light-emitting diode ", more detailed description is to be obtained the required voltage of this light-emitting diode by a processor, and because the direct supplier of the electric power of light-emitting diode is a LED drive, therefore, this processor promptly is to be obtained or perhaps light-emitting diode sends this required voltage to this processor and knows by LED drive.The 3rd, the step of above-mentioned " adjustment exports this driving voltage of this light-emitting diode to " is adjusted this driving voltage that exports this light-emitting diode to.Because LED drive is that the supply voltage by a power supply unit is its power source, therefore, adjusting this driving voltage in fact is exactly to set about by adjusting this supply voltage, and the mode of adjusting sends a signal to this power supply unit by this processor exactly, makes power supply unit reduce the supply voltage that it is exported.If the too high LED drive that makes of supply voltage is excessive to the amplitude that driving voltage carries out pressure drop, then reduce supply voltage.
When common method of the present invention is powered actually, can allow power supply unit that a higher voltage is provided, that is the required voltage that its supply voltage exceeds light-emitting diode reaches a degree, may be to exceed 1/5th, or 1/4th, or even 1/3rd, because LED drive has a voltage current adapter, therefore if the supply overtension of power supply unit, driver, that certainly will force when being converted to electric current is reduced described higher voltage, so that export the electric current of light-emitting diode to is its acceptable lowest high-current value, just can allow light-emitting diode total power exporter, thus, processor can be learnt the operating voltage of light-emitting diode by LED drive, thereby be sent to the control power supply unit with a control signal, make it reduce its supply voltage, in other words, furthered exactly difference between supply voltage and the operating voltage is to reduce the burden of LED drive.In theory, supply voltage is to be reduced to the operating voltage of light-emitting diode identically, but in fact owing to still will pass through LED drive, and this will inevitably cause a little pressure drop, so supplies voltage and be still a little more than the light-emitting diode required voltage.
See also Fig. 4, be the circuit box schematic diagram of switched power supply of the present invention.Wherein have a rectifier (rectification circuit) 2 ' 1 in the switched power supply 2 ', in order to receiving the alternating current AC of external power source, and be converted into a supply voltage v1 and export to LED drive 3 ' (please see Figure 5).Power supply unit 2 ' also comprises a power factor (PF) corrector 2 ' 2, in order to revise the galvanic power factor (PF) from this rectifier 2 ' 1.The power supply unit 2 ' that provides among Fig. 4 also comprises a transformer (transforming circuit) 2 ' 3, will reduce to this LED drive 3 ' receptible size from the voltage of this power factor (PF) corrector 2 ' 2.In addition, power supply unit 2 ' also has a digital analog converter 2 ' 4, be electrically connected to transformer 2 ' 3, be to be used for control signal 5b that processor 5 (please see Figure 5) is produced, be converted to a control voltage Vctrl, deliver to this transformer 2 ' 3 again, make transformer 2 ' 3 be able to change the own supply voltage v1 that is exported according to control signal 5b.
See also Fig. 5, be the circuit box schematic diagram of light source power control of the present invention system.The processor 5 wherein and the explanation of switched power supply 2 ' have been chatted bright in above-mentioned each paragraph, are not giving unnecessary details in this.Therefore only explain with regard to LED drive 3 '.Fig. 5 provides LED drive 3 ' also to comprise a loop of power circuit 3 ' 1, normally a simulated power loop (analog powers tage), foundation by this loop, make the required voltage of each light-emitting diode become the information that can outwards send, and by a driver control circuit 3 ' 2, normally a drive logic (driver logic) is served as, and the operating voltage of light-emitting diode is sent to processor 5 with a drive signal 5a.
Please continue to consult Fig. 5, further provide loop of power circuit 3 ' 1 to comprise one or more voltage current adapter (Voltage to Current Converter) (3 ' 10R, 3 ' 10G, 3 ' 10B), be electrically connected with this power supply unit 2 ', should supply voltage v1 and be adjusted to this drive current A, so that light-emitting diode (4R, 4G, 4B) can total power be exported but unlikely damage.In addition, because mostly the projector of higher-order is RGB three former smooth color separation processing, so the present invention explains with regard to the light-emitting diode (4R, 4G, 4B) that has been divided into three light sources.Therefore also supply voltage v1 then at this three light-emitting diodes and be divided into the first supply voltage v1R, the second supply voltage v1G and the 3rd supply voltage v1B, be sent to first voltage current adapter, 3 ' 10R, second voltage current adapter, 3 ' 10G and tertiary voltage current converter 3 ' 10B respectively.And the effect by each voltage current adapter, and produce one first drive current A-R, the second drive current A-G and the 3rd drive current A-R from it, and export light-emitting diode respectively to again (4R, 4G, 4B).And between each light-emitting diode and each voltage current adapter, then promptly may be read into an operating voltage v2.
Please continue to consult Fig. 5, it is by described three voltage current adapter (3 ' 10R that loop of power circuit 3 ' 1 wherein further is provided, 3 ' 10G, 3 ' 10B) and each voltage current adapter all can transmit signals mutually with driver control circuit 3 ' 2, and make driver control circuit 3 ' 2 obtain each voltage current adapter in the operating voltage v2 of conversion from power supply unit 2 ', and driver control circuit 3 ' 2 transmits a drive signal 5a again and gives processor 5, processor 5 can be learnt a voltage change thus, that is poor between supply voltage v1 and the operating voltage v2, and judge that first supplies voltage v1R, the second supply voltage v1G, and the 3rd supply voltage v1B whether too high, afterwards, processor 5 produces a control voltage Vctrl with a control signal 5b by digital analog converter 2 ' 4 again and adjusts the first supply voltage v1R that transformer 2 ' 3 is exported, the second supply voltage v1G, and the 3rd supply voltage v1B.Processor 5 then can be connected to driver control circuit 3 ' 2 and digital analog converter 2 ' 4 by IIC or this interface of two types of SPI.
Please cooperate Fig. 5, when common method of the present invention is powered actually, when opening the power supply of projector at the beginning again, at first be to allow switched power supply 2 ' provide a higher voltage to LED drive 3 ', that is its supply voltage exceeds each light-emitting diode (4R, 4G, required voltage 4B) reaches a degree, may be to exceed 1/5th, or 1/4th, or even 1/3rd, that is to say the first supply voltage v1R, the second supply voltage v1G, and the 3rd supply voltage v1B be exceed each light-emitting diode originally required voltage arrive a specific degrees, for example the required voltage of light-emitting diode is 4.5 volts, and then driving voltage may supply to 6 volts.Follow each voltage current adapter (3 ' 10R of LED drive 3 ', 3 ' 10G, 3 ' 10B) for being provided, light-emitting diode decides electric current, the i.e. first drive current A-R, the second drive current A-G, and the 3rd drive current A-B, thereby force described higher driving voltage is reduced, numerical value after reducing promptly is light-emitting diode (4R, 4G, 4B) and the operating voltage v2 between each voltage current adapter, that is to say up to the present, driver 3 ' is for the pressure drop that light-emitting diode is provided the absorption deciding electric current and force between each driving voltage and each operating voltage, thereby produces a large amount of heat.In this simultaneously, driver control circuit 3 ' 2 can pass through drive signal 5a notification processor 5 with supply voltage to the reduction amplitude of operating voltage, thereby processor 5 can judge whether respectively supply voltage too high actually, as too high, then produce a control voltage Vctrl by digital analog converter 2 ' 4 and send transformer 2 ' 3 to, make it to reduce supply voltage with a control signal corresponding 5b.In theory, the supply voltage be reduced to the operating voltage of light-emitting diode identical, but in fact owing to still will pass through LED drive, and this will inevitably cause a little pressure drop, therefore supply voltage and be still, otherwise supply voltage certainly will be lower than the operating voltage of light-emitting diode because of the consumption of driver behind the process driver a little more than the light-emitting diode required voltage.By the way, by method and system of the present invention, driver 3 ' no longer needs significantly to reduce the supply voltage v1 from power supply unit 2 ', the also greatly reduction of heat that driver 3 ' produces because of step-down so consume that electric power at driver 3 ' also greatly reduces.
In sum, the present invention " uses the light source power control method and system of the projector of LED source ", it is function by a processor, obtain LED drive and whether be transfused to too high voltage, if the overtension of input, then processor just reduces this voltage that inputs to LED drive.So, promptly reduced the problem of " heat of the LED drive that causes because of the overtension of input generates " as much as possible, not only reduced the consumption of electric power, the damage of also having avoided associated electronic components to cause as much as possible because of heat.And work as heat not for another example not for a long time in the past, on behalf of projector's power consumption, this descend, and can reduce its radiating requirements to LED drive, also makes the structural design of projector more to simplify, thereby reduces relevant cost.Therefore, reduce power consumption and reduce cost, for the producer or user of projector, all are very favourable advantages.
The foregoing description is only given an example for convenience of description, though appointed by those skilled in the art executing the craftsman to think is to modify as all, right neitherly takes off the Protector that claim is desired who encloses.
Claims (15)
1. a light source power control method of using the projector of LED source is characterized in that, comprises the following steps:
One LED drive and a light-emitting diode are provided;
Output one supply voltage is to this LED drive, and this LED drive provides a drive current to this light-emitting diode;
Obtain the operating voltage of this light-emitting diode; And
Adjust this supply voltage.
2. the light source power control method of the projector of use LED source as claimed in claim 1 is characterized in that, this supplies voltage, is supplied with by a power supply unit.
3. as the light source power control method of the projector of claim 2 a described use LED source, it is characterized in that, adjust this supply voltage, is to control this power supply unit by a processor to reach.
4. the light source power control method of the projector of use LED source as claimed in claim 1 is characterized in that, more comprises a step: a processor is provided, is carried out by this processor and adjust this supply voltage.
5. the light source power control method of the projector of use LED source as claimed in claim 1 is characterized in that, this operating voltage is to obtain from this LED drive.
6. the light source power control method of the projector of use LED source as claimed in claim 5, it is characterized in that, more comprise a step: provide a power supply unit, be electrically connected with this light-emitting diode, this power supply unit is in order to export this supply voltage to this LED drive.
7. the light source power control method of the projector of use LED source as claimed in claim 1 is characterized in that, more comprises the following steps:
Judge if export this supply voltage of this light-emitting diode to, greater than this operating voltage of this light-emitting diode add the required work pressure drop of this LED drive with, then should supply voltage and be reduced.
8. the light source power control method of the projector of use LED source as claimed in claim 7 is characterized in that, this supply voltage is supplied to this LED drive by a power supply unit.
9. a light source power control system that uses the projector of LED source is characterized in that, comprising:
One power supply unit produces a supply voltage;
One LED drive is electrically connected to this power supply unit and accepts this supply voltage, and exports a drive current; And
One processor is electrically connected to this power supply unit and this LED drive, and wherein, this processor is in order to change this supply voltage.
10. the light source power control system of the projector of use LED source as claimed in claim 9 is characterized in that, this processor is to obtain a drive signal from this LED drive.
11. the light source power control system of the projector of use LED source as claimed in claim 10 is characterized in that this drive signal has the operating voltage of a light-emitting diode.
12. the light source power control system of the projector of use LED source as claimed in claim 9 is characterized in that this processor sends a control signal to this power supply unit.
13. the light source power control system of the projector of use LED source as claimed in claim 12 is characterized in that, this control signal is carried the amplitude of this power supply unit to the required change of this supply voltage.
14. the light source power control system of the projector of use LED source as claimed in claim 12 is characterized in that, this power supply unit more comprises:
One rectifier is converted to direct current in order to the alternating current with power supply;
One power factor (PF) corrector is in order to revise the galvanic power factor (PF) from this rectifier;
One transformer will be reduced to the receptible magnitude of voltage of this LED drive from the magnitude of voltage of this power factor (PF) corrector; And
One digital analog converter is electrically connected with this transformer, with this control signal that this processor produces, is converted to a control voltage, delivers to this transformer again, and this supply voltage is changed.
15. the light source power control system of the projector of use LED source as claimed in claim 12 is characterized in that, this LED drive more comprises:
One voltage current adapter is electrically connected with this power supply unit, should supply voltage and be adjusted to this drive current; And
One driver control circuit is electrically connected and transmits a drive signal with this processor and gives this processor; And be electrically connected to obtain the operating voltage of light-emitting diode with voltage current adapter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102094727A CN102056370A (en) | 2009-10-30 | 2009-10-30 | Light source electric power control method and system for projector using light-emitting diode light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102094727A CN102056370A (en) | 2009-10-30 | 2009-10-30 | Light source electric power control method and system for projector using light-emitting diode light source |
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| CN102056370A true CN102056370A (en) | 2011-05-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438375A (en) * | 2011-12-19 | 2012-05-02 | 四川长虹电器股份有限公司 | LED (Light Emitting Diode) driving system for mini projector |
| CN102967552A (en) * | 2012-11-13 | 2013-03-13 | 天津市一瑞生物工程有限公司 | Multi-light-source multi-duct biochemical detection luminescence control circuit |
| CN107608167A (en) * | 2017-10-11 | 2018-01-19 | 深圳奥比中光科技有限公司 | Laser projection device and its method of controlling security |
| CN107942612A (en) * | 2017-11-24 | 2018-04-20 | 深圳奥比中光科技有限公司 | The optical projection apparatus and its method for packing of the film containing monitoring |
| CN107991836A (en) * | 2017-12-18 | 2018-05-04 | 深圳奥比中光科技有限公司 | A kind of optical projection module containing safety monitoring function |
-
2009
- 2009-10-30 CN CN2009102094727A patent/CN102056370A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438375A (en) * | 2011-12-19 | 2012-05-02 | 四川长虹电器股份有限公司 | LED (Light Emitting Diode) driving system for mini projector |
| CN102967552A (en) * | 2012-11-13 | 2013-03-13 | 天津市一瑞生物工程有限公司 | Multi-light-source multi-duct biochemical detection luminescence control circuit |
| CN107608167A (en) * | 2017-10-11 | 2018-01-19 | 深圳奥比中光科技有限公司 | Laser projection device and its method of controlling security |
| CN107942612A (en) * | 2017-11-24 | 2018-04-20 | 深圳奥比中光科技有限公司 | The optical projection apparatus and its method for packing of the film containing monitoring |
| CN107991836A (en) * | 2017-12-18 | 2018-05-04 | 深圳奥比中光科技有限公司 | A kind of optical projection module containing safety monitoring function |
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Application publication date: 20110511 |