CN201166692Y - Apparatus for detecting abnormal state of illuminating device - Google Patents
Apparatus for detecting abnormal state of illuminating device Download PDFInfo
- Publication number
- CN201166692Y CN201166692Y CN 200820001977 CN200820001977U CN201166692Y CN 201166692 Y CN201166692 Y CN 201166692Y CN 200820001977 CN200820001977 CN 200820001977 CN 200820001977 U CN200820001977 U CN 200820001977U CN 201166692 Y CN201166692 Y CN 201166692Y
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- switch
- light
- pick
- unit
- circuit
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
The utility model discloses a detecting device for detecting the abnormal state of an illuminating device. The illuminating device comprises at least a light emitting diode and is provided with a high potential end. The detecting device comprises a first switching circuit and a second switching circuit. The first switching circuit is electrically connected between a power supply end and the high potential end of the illuminating device. The first switch in the first switching circuit can be powered on or powered off because of a potential difference between the power supply end and the high potential end. The second switching circuit is electrically connected between the first switch and a reference power supply end. A second switch in the second switching circuit can be turned on along with the turning-on of the first switch, so that the second switching circuit outputs a detecting voltage. The detecting voltage represents the abnormal state of the illuminating device.
Description
Technical field
The utility model relates to a kind of pick-up unit, particularly relates to a kind of pick-up unit of abnormality of a light-emitting device that comprises at least one light emitting diode in order to detection.
Background technology
So far, (cold cathode fluorescent lamp CCFL) is widely used in the backlight of electronic equipments such as large-scale LCD, LCD TV, scanner, advertising lamp box and mobile computer to cold cathode fluorescent lamp.This be because cold cathode fluorescent lamp has that fluorescent tube is tiny, simple in structure, surface of the light tube temperature increasing degree is little, surface of the light tube brightness height, easily be processed into different shape, long service life, colour rendering is good and luminous advantage such as even.
Yet, light emitting diode (light-emitting diode, LED) than cold cathode fluorescent lamp have more power saving, multiple advantages such as the life-span is longer, color saturation is high, reaction velocity is fast, shatter-proof withstand voltage and volume are little.So, adopt light-emitting diode lamp tube as back light, be the following technology that is hopeful to substitute the traditional cold cathode fluorescent tube most.
Because light-emitting diode lamp tube is formed line source by pointolite, therefore need use many light emitting diodes.If the light emitting diode in the light-emitting diode lamp tube opens circuit or burns, will make the light uniformity coefficient of light-emitting diode lamp tube descend and influence the service property (quality) of electronic equipment.
Therefore, main category of the present utility model is to provide a kind of pick-up unit, to address the above problem.
The utility model content
A category of the present utility model is to provide a kind of pick-up unit in order to the abnormality that detects a light-emitting device.This light-emitting device comprises at least one light emitting diode and has a hot end.
In according to a specific embodiment of the present utility model, this pick-up unit comprises one first on-off circuit and a second switch circuit.This first on-off circuit is electrically connected between this hot end of a power supply end and this light-emitting device.This first on-off circuit comprises one first switch, and this first switch responds the potential difference (PD) between this power supply end and this hot end and opens or cut out.
This second switch circuit is electrically connected between this first switch and the reference power source end.This reference power source end is supplied a reference voltage.This second switch circuit comprises a second switch, and this second switch responds the unlatching of this first switch and open, and causes this second switch circuit and then detects voltage based on this reference voltage output one.This detection voltage is promptly represented the abnormality of this light-emitting device.
Can be further understood by following utility model detailed description and accompanying drawing about advantage of the present utility model and spirit.
Description of drawings
Fig. 1 shows the circuit diagram according to the pick-up unit of a specific embodiment of the present utility model.
Fig. 2 shows the circuit diagram by another specific embodiment that pick-up unit extended among Fig. 1.
The reference numeral explanation
1: pick-up unit 2: light-emitting device
On-off circuit 12 in 10: the first: the second switch circuit
14: transistor 20: light emitting diode
Switch 120 in 100: the first: second switch
Vs: power supply end VR: reference power source end
Vd: detect voltage Vc: control voltage
Embodiment
Please refer to Fig. 1.Fig. 1 shows the circuit diagram according to the pick-up unit 1 of a specific embodiment of the present utility model.Pick-up unit 1 is in order to detect the abnormality of light-emitting device 2.For example, light-emitting device 2 can be the backlight of LCD, LCD TV, scanner, advertising lamp box, mobile computer etc.Light-emitting device 2 comprises at least one light emitting diode 20, and this abnormality can refer to that light emitting diode 20 in the light-emitting device 2 opens circuit or burns.
As shown in Figure 1, light-emitting device 2 can comprise a plurality of light emitting diodes 20 and have a hot end.Pick-up unit 1 comprises first on-off circuit 10 and second switch circuit 12.First on-off circuit 10 is electrically connected between this hot end of a power supply end Vs and light-emitting device 2.First on-off circuit 10 comprises first switch 100, and first switch 100 responds the potential difference (PD) between this power supply end Vs and this hot end and opens or cut out.
In actual applications, first switch 100 can be a metal oxide semiconductcor field effect transistor (metal-oxide-semiconductor field-effect transistor, MOSFET) or a pair of junction transistor (bipolar junction transistor, BJT), but not as limit.
In actual applications, second switch 120 can be a metal oxide semiconductcor field effect transistor, a pair of junction transistor or a photo-coupler (photo coupler), but not as limit.
As shown in Figure 1, in this embodiment, first switch 100 can be a PMOS transistor, and second switch 120 can be a photo-coupler.Node A represents this hot end of light-emitting device 2, and Node B is represented the transistorized source electrode of PMOS.
When each light emitting diode 20 in the light-emitting device 2 during in operate as normal, the voltage of node A is less than the voltage of Node B.Therefore, this PMOS transistor meeting conducting, and the also and then conducting of this photo-coupler.At this moment, this photo-coupler output first detects voltage Vd.On behalf of light-emitting device 2, first detects voltage Vd promptly be in normal operating conditions.
When any light emitting diode 20 in the light-emitting device 2 opened circuit or burns, the voltage of node A can equal the voltage of Node B.Therefore, this PMOS transistor can end, and this photo-coupler also and then ends.At this moment, this photo-coupler output second detects voltage Vd.On behalf of light-emitting device 2, second detects voltage Vd promptly abnormality takes place.
Please refer to Fig. 2.Fig. 2 shows the circuit diagram of another specific embodiment that is extended by the pick-up unit among Fig. 11.As shown in Figure 2, the detection voltage Vd that this photo-coupler produced can export an end points of a transistor 14 to.In actual applications, transistor 14 can be a metal oxide semiconductcor field effect transistor 14 or a pair of junction transistor 14.
In this embodiment, transistor 14 can be a nmos pass transistor 14, and this end points is the grid (Gate) of nmos pass transistor 14.
Represent light-emitting device 2 that abnormality takes place because second detects voltage Vd; suppose that this photo-coupler output second detects the grid of voltage Vd to nmos pass transistor 14; detect voltage Vd, nmos pass transistor 14 meeting outputs one corresponding control voltage Vc to a holding circuit (not being shown among Fig. 2) according to second.
After this holding circuit received control voltage Vc, this holding circuit can be closed the power supply end Vs of supply light-emitting device 2 to avoid more multiple optical diode 20 impaired.Perhaps, this holding circuit can be sent a warning signal, to inform user's light-emitting device 2 abnormality takes place.In actual applications, the function of this holding circuit can design according to actual demand, but not as limit.
Compared to prior art, whether the backlight by light emitting diode constituted that can detect in LCD or the mobile computer according to pick-up unit of the present utility model abnormality takes place.At this abnormality, also can arrange in pairs or groups a holding circuit protecting this backlight according to pick-up unit of the present utility model, and then guarantee to use the service property (quality) of the electronic equipment of this backlight.
By the above detailed description of preferred embodiments, hope can be known description feature of the present utility model and spirit more, and is not to come category of the present utility model is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category that is arranged in claim of the present utility model of various changes and tool equality.Therefore, the category of claim of the present utility model should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (8)
1. pick-up unit that detects the abnormality of a light-emitting device, this light-emitting device comprises at least one light emitting diode and has a hot end, it is characterized in that, and this pick-up unit comprises:
One first on-off circuit, this first on-off circuit is electrically connected between this hot end of a power supply end and this light-emitting device, this first on-off circuit comprises one first switch, and this first switch responds the potential difference (PD) between this power supply end and this hot end and opens or cut out; And
One second switch circuit, this second switch circuit be electrically connected on this first switch and a reference power source end between, this reference power source end is supplied a reference voltage, this second switch circuit comprises a second switch, this second switch is responded the unlatching of this first switch and is opened, cause this second switch circuit and then detect voltage based on this reference voltage output one, wherein this detection voltage is promptly represented the abnormality of this light-emitting device.
2. pick-up unit as claimed in claim 1 is characterized in that, wherein this first switch is a metal oxide semiconductcor field effect transistor or a pair of junction transistor.
3. pick-up unit as claimed in claim 2 is characterized in that, wherein one of them in the group that is made up of a metal oxide semiconductcor field effect transistor, a pair of junction transistor and a photo-coupler of this second switch.
4. pick-up unit as claimed in claim 3 is characterized in that, wherein this detection voltage and export a transistorized end points to detects voltage according to this, this transistor output one control voltage to one holding circuit.
5. pick-up unit as claimed in claim 4 is characterized in that, wherein this transistor is a metal oxide semiconductcor field effect transistor or a pair of junction transistor.
6. pick-up unit as claimed in claim 5 is characterized in that, wherein this transistor is a nmos pass transistor, and this end points is the grid of this nmos pass transistor.
7. pick-up unit as claimed in claim 4 is characterized in that, wherein a warning signal is closed or produced to this holding circuit in order to this power supply end that will supply this light-emitting device.
8. pick-up unit as claimed in claim 1 is characterized in that, wherein this abnormality refers to that a light emitting diode in this light-emitting device opens circuit or burns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820001977 CN201166692Y (en) | 2008-01-16 | 2008-01-16 | Apparatus for detecting abnormal state of illuminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820001977 CN201166692Y (en) | 2008-01-16 | 2008-01-16 | Apparatus for detecting abnormal state of illuminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201166692Y true CN201166692Y (en) | 2008-12-17 |
Family
ID=40192082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820001977 Expired - Fee Related CN201166692Y (en) | 2008-01-16 | 2008-01-16 | Apparatus for detecting abnormal state of illuminating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201166692Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129021A (en) * | 2010-01-12 | 2011-07-20 | 鸿富锦精密工业（深圳）有限公司 | LED (Light-Emitting Diode) tester |
-
2008
- 2008-01-16 CN CN 200820001977 patent/CN201166692Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129021A (en) * | 2010-01-12 | 2011-07-20 | 鸿富锦精密工业（深圳）有限公司 | LED (Light-Emitting Diode) tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081217 Termination date: 20120116 |