CN101191954A - Luminous diode lighting device powered by LCD device - Google Patents
Luminous diode lighting device powered by LCD device Download PDFInfo
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- CN101191954A CN101191954A CNA2006101570313A CN200610157031A CN101191954A CN 101191954 A CN101191954 A CN 101191954A CN A2006101570313 A CNA2006101570313 A CN A2006101570313A CN 200610157031 A CN200610157031 A CN 200610157031A CN 101191954 A CN101191954 A CN 101191954A
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Abstract
The present invention provides a light emitting diode illuminating apparatus applying liquid crystal display device to supply power, comprising a light emitting diode light source and a movable bracket. The light emitting diode light source is connected with a liquid crystal display device through the movable bracket. The light emitting diode light source comprises an illuminating circuit, and the illuminating circuit adopts a power circuit of the liquid crystal display device for power supply.
Description
Technical field
The invention relates to a kind of light emitting diode illuminating apparatus of device powered by LCD.
Background technology
The light emitting diode thermal value is few, radiationless, efficient is high, belongs to typical green illumination light source, and the trend that replaces conventional incandescent and fluorescent lighting is arranged.Yet semiconductor lighting also is in research and development and test manufacture stage, has a lot of defectives on technical merit and the product quality.
Adopt light emitting diode to adopt capacitance-resistance pressure drop circuit or Industrial Frequency Transformer power supply as the light emitting diode illuminating apparatus of light source on the market, wherein, the power circuit of employing capacitance-resistance pressure drop circuit supply as shown in Figure 1 more.This power circuit 10 comprises a full bridge rectifier 11, a switch 12, a capacitance-resistance pressure drop circuit 14 and an a plurality of light emitting diode 13.This full bridge rectifier 11 comprises two input ends 111,112, a positive output end 113 and a negative output terminal 114, and wherein an input end 112 is connected with this switch 12.This capacitance-resistance pressure drop circuit 14 is formed in parallel by resistance and an electric capacity, these capacitance-resistance pressure drop circuit 14 1 ends are connected with this positive output end 113, its other end is electrically connected the positive pole of a light emitting diode 13, other light emitting diode 13 is serially connected with the negative pole of this light emitting diode 13 successively, and the negative electricity of the light emitting diode 13 at end connects this negative output terminal 114.Extraneous alternating voltage is by these two input ends, 111,112 inputs, this full bridge rectifier 11 changes the alternating voltage of input into DC voltage, and it is normally luminous to drive this light emitting diode 13 that the DC voltage that this capacitance-resistance pressure drop circuit 14 is exported full bridge rectifier 11 changes low-voltage into.
This power circuit 10 is simple in structure, directly power with the civil power of 110V or 220V, but city's electro-mechanical wave is bigger, and very easily light and shade changes with city's electro-mechanical wave in the brightness of light source, so stroboscopic phenomenon can appear in LED source.This power circuit 10 does not have isolation with civil power again, and the electric leakage accident takes place easily.When being switched on or switched off power circuit, capacitor charge and discharge moment is attended by dash current, may damage light-emitting diode chip for backlight unit, even may cause semiconductor PN to puncture, thereby damages LED source.
Summary of the invention
In order to solve the problem of light emitting diode illuminating apparatus brightness instability in the prior art, defencive function shortcoming, the invention provides the light emitting diode illuminating apparatus of the complete device powered by LCD of a kind of brightness stability, defencive function.
A kind of light emitting diode illuminating apparatus of device powered by LCD, it comprises a LED source and a travel(l)ing rest, this LED source is connected with liquid crystal indicator by this travel(l)ing rest, this LED source comprises a lighting circuit, and this lighting circuit adopts the power circuit power supply of this liquid crystal indicator.
Compared with prior art, the light emitting diode illuminating apparatus of device powered by LCD of the present invention provides direct supply by the power circuit of liquid crystal indicator, the power circuit of liquid crystal indicator has negative feedback and positive feedback function, so can guarantee output voltage stabilization.This power circuit output and importation are isolated, and be therefore very safe in use.This power circuit has the electromagnetic interference (EMI) filter function simultaneously, can stop extraneous electromagnetic interference (EMI).Light emitting diode illuminating apparatus adopts this power circuit power supply to have advantages such as no stroboscopic, safety, no impact.When using liquid crystal indicator night, this light emitting diode illuminating apparatus can provide bright and soft illumination, and its power is very little simultaneously, compared to the more power saving of general lighting device.
Description of drawings
Fig. 1 is a kind of electrical block diagram of power circuit of prior art invention light emitting diode illuminating apparatus.
Fig. 2 is the structural representation of the light emitting diode illuminating apparatus of device powered by LCD of the present invention.
Fig. 3 is the circuit construction of electric power synoptic diagram of liquid crystal indicator shown in Figure 2.
Fig. 4 is the circuit structure diagram of the lighting circuit of LED source shown in Figure 2.
Embodiment
See also Fig. 2, it is the structural representation of the light emitting diode illuminating apparatus of device powered by LCD of the present invention.This light emitting diode illuminating apparatus 20 comprises a LED source 21, a liquid crystal indicator 22 and a travel(l)ing rest 23, and this LED source 21 is connected with this liquid crystal indicator 22 by this travel(l)ing rest 23.In the time need not throwing light on, this LED source 21 can be packed up and place after the liquid crystal indicator 22; But when needs throw light on, this LED source 21 pulled out and flexible to correct position.This LED source 21 comprises a lighting circuit, and this lighting circuit is by the power circuit power supply of this liquid crystal indicator 22.
See also Fig. 3, it is the circuit construction of electric power synoptic diagram of liquid crystal indicator shown in Figure 2.This power circuit 30 comprises an electromagnetic interference (EMI) filtering circuit 301, a full bridge rectifier 302, a high voltage direct current filtering circuit 303, an isolation high-frequency transformer 304, a lower pressure rectifier circuit 305, a direct current π type filtering circuit 306, a voltage detecting circuit 307, a light-coupled isolation feedback circuit 308, a PWM controller 309, a transistor 310, a high pressure clamping circuit 311 and a current detection circuit 312.Wherein, this transistor 310 is metal oxide semiconductcor field effect transistors.
Extraneous alternating voltage inputs to this electromagnetic interference filter circuit 301, and this electromagnetic interference filter circuit 301 can stop extraneous electromagnetic interference (EMI) to enter this power circuit 30, also stops these power circuit 30 inner electromagnetic interference (EMI) that produce to feed back to the external world simultaneously.These electromagnetic interference filter circuit 301 outputs still are alternating voltage, this full bridge rectifier 302 changes this alternating voltage into DC voltage and inputs to this high voltage direct current filtering circuit 303, this DC voltage inputs to this isolation high-frequency transformer 304 after these high voltage direct current filtering circuit 303 Filtering Processing, this isolation high-frequency transformer 304 changes high pressure into low pressure, press from this low-voltage of isolating high-frequency transformer 304 outputs output galvanic current after this lower pressure rectifier circuit 305 and 306 rectifications of direct current π type filtering circuit, filtering, as 5V, 12V voltage etc.
The above is the main operating circuit of this power circuit 30, and this power circuit 30 has negative feedback and positive feedback function simultaneously, and is as described below respectively.
This voltage detecting circuit 307 detects the output voltage of this direct current π type filtering circuit 306 and is sent to this light-coupled isolation feedback circuit 308, the detection signal that this light-coupled isolation feedback circuit 308 will be imported feeds back to this PWM controller 309, this PWM controller 309 according to the situation output control corresponding signal of feedback input signal with the unlatching of controlling this transistor 310 or close, this transistor 310 by this high pressure clamping circuit 311 controlling the break-make of this main operating circuit, thereby make output voltage stabilization.This process is a negative feedback process.
This current detection circuit 312 detects the electric current of this isolation high-frequency transformer 304 and feeds back to this PWM controller 309 by this transistor 310, this PWM controller 309 according to the situation output control corresponding signal of feedback input signal with the unlatching of controlling this transistor 310 or close, this transistor 310 by this high pressure clamping circuit 311 controlling the break-make of this main operating circuit, thereby make output voltage stabilization.This process is a positive feedback process.
See also Fig. 4, it is the circuit structure diagram of the lighting circuit of LED source shown in Figure 2.This lighting circuit 40 comprises an input end 41, a protective tube 42, a switch 43 and a plurality of light emitting diode 44, and this protective tube 42, switch 43 and a plurality of light emitting diode 44 are serially connected between this input end 41 and the ground successively.The DC voltage of power circuit 30 outputs shown in Figure 3 is directly inputted into this input end 41, and when switch 43 closures, this light emitting diode 44 just can be normally luminous.The power of this light emitting diode 44 is very little, and therefore the normal power supply to liquid crystal indicator 22 does not influence.
Compared with prior art, luminous two of device powered by LCD of the present invention Utmost point pipe lighting device provides dc source, liquid crystal by the power circuit of liquid crystal indicator The power circuit of display unit has negative-feedback and positive feedback function, so can guarantee output Voltage stabilization. This power circuit output and importation are isolated, therefore make Time spent is very safe. This power circuit has the EMI Filtering function simultaneously, can stop Extraneous electromagnetic interference. Light emitting diode illuminating apparatus adopts this power circuit power supply tool Have or not the advantages such as stroboscopic, safety, no impact. When use liquid crystal indicator at night The time, this light emitting diode illuminating apparatus can provide bright and soft illumination, simultaneously its Power is very little, compared to the more power saving of general lighting device.
Claims (5)
1. the light emitting diode illuminating apparatus of a device powered by LCD, it comprises a LED source, this LED source comprises a lighting circuit, it is characterized in that: the light emitting diode illuminating apparatus of this device powered by LCD also comprises a travel(l)ing rest, this LED source is connected with this liquid crystal indicator by this travel(l)ing rest, and this lighting circuit adopts the power circuit power supply of this liquid crystal indicator.
2. the light emitting diode illuminating apparatus of device powered by LCD as claimed in claim 1, it is characterized in that: this lighting circuit comprises an input end, a protective tube, a switch and a plurality of light emitting diode, this protective tube, switch and a plurality of light emitting diode are serially connected between this input end and the ground successively, and this input end receives the DC voltage that the power circuit of this liquid crystal indicator provides.
3. the light emitting diode illuminating apparatus of device powered by LCD as claimed in claim 1, it is characterized in that: the power circuit of this liquid crystal indicator comprises an electromagnetic interference filter circuit that constitutes main operating circuit, one full bridge rectifier, one high voltage direct current filtering circuit, one isolates high-frequency transformer, an one lower pressure rectifier circuit and a direct current π type filtering circuit, extraneous alternating voltage is through this electromagnetic interference filter circuit, full bridge rectifier and the rectification of high voltage direct current filtering circuit, input to this isolation high-frequency transformer after the filtering, this isolation high-frequency transformer changes high pressure into low pressure, from this low-voltage of isolating high-frequency transformer output through this lower pressure rectifier circuit and the rectification of direct current π type filtering circuit, the output galvanic current is pressed after the filtering.
4. the light emitting diode illuminating apparatus of device powered by LCD as claimed in claim 3, it is characterized in that: the power circuit of this liquid crystal indicator also comprises a voltage detecting circuit, one light-coupled isolation feedback circuit, one PWM controller, one transistor and a high pressure clamping circuit, this voltage detecting circuit detects the output voltage of this direct current π type filtering circuit and feeds back to this PWM controller by this light-coupled isolation feedback circuit, this PWM controller according to the situation output control corresponding signal of feedback input signal with this transistorized unlatching of control or close, this transistor by this high pressure clamping circuit to control the break-make of this main operating circuit.
5. the light emitting diode illuminating apparatus of device powered by LCD as claimed in claim 4, it is characterized in that: the power circuit of this liquid crystal indicator also comprises a current detection circuit, this current detection circuit detects the electric current of this isolation high-frequency transformer and feeds back to this PWM controller by this transistor, this PWM controller according to the situation output control corresponding signal of feedback input signal with this transistorized unlatching of control or close, this transistor by this high pressure clamping circuit to control the break-make of this main operating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101570313A CN101191954A (en) | 2006-11-24 | 2006-11-24 | Luminous diode lighting device powered by LCD device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101570313A CN101191954A (en) | 2006-11-24 | 2006-11-24 | Luminous diode lighting device powered by LCD device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101191954A true CN101191954A (en) | 2008-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101570313A Pending CN101191954A (en) | 2006-11-24 | 2006-11-24 | Luminous diode lighting device powered by LCD device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101191954A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794554A (en) * | 2010-03-31 | 2010-08-04 | 华为终端有限公司 | Method and device for adjusting brightness in paper-like display device and paper-like display system |
| CN101854114B (en) * | 2009-04-01 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Power supply module |
| TWI629917B (en) * | 2017-07-26 | 2018-07-11 | 大樑科技實業有限公司 | Lighting system |
-
2006
- 2006-11-24 CN CNA2006101570313A patent/CN101191954A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854114B (en) * | 2009-04-01 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Power supply module |
| CN101794554A (en) * | 2010-03-31 | 2010-08-04 | 华为终端有限公司 | Method and device for adjusting brightness in paper-like display device and paper-like display system |
| TWI629917B (en) * | 2017-07-26 | 2018-07-11 | 大樑科技實業有限公司 | Lighting system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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