CN1783630A - Novel lightning protecting device used for display device - Google Patents
Novel lightning protecting device used for display device Download PDFInfo
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- CN1783630A CN1783630A CN 200410077242 CN200410077242A CN1783630A CN 1783630 A CN1783630 A CN 1783630A CN 200410077242 CN200410077242 CN 200410077242 CN 200410077242 A CN200410077242 A CN 200410077242A CN 1783630 A CN1783630 A CN 1783630A
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- display device
- novel lightning
- discharge tube
- lightning protecting
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- 230000021615 conjugation Effects 0.000 claims description 28
- 239000011521 glass Substances 0.000 claims description 12
- 229910052770 Uranium Inorganic materials 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
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- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
This invention relates to a new anti-lightning strike device used in a display device including a fuse serial onto a L line characterizing in also including a conjugate inductor, a resistor, a discharge tube and a resistor to be serial to a branch and the resistor absorbs the energy when the discharge tube discharges, which utilizes the electromagnetic property of the conjugate inductor to protect the supply of supply and the HF head effectively.
Description
Technical field
The present invention relates to anti-lightning strike (surge) technology, particularly colour TV of electronic equipment and anti-lightning strike (also claiming surge) device of similar electronic display unit.
Background technology
Current, the lightning protection of homemade colour TV and display device (surge) technology is fairly simple and coarse, even most of product does not also have.Described simple way is the piezo-resistance of output cross-over connection at power supply, being beneficial to piezo-resistance shunts high pressure, benefit be cost seldom, its shortcoming is to bear higher surge voltage and energy, and the voltage that thunderbolt in most cases produces is very high, though all above-mentioned processing modes have anti-lightning strike processing, there is not effect basically in the actual application.
In order to prevent thunderbolt conscientiously; external colour TV adopted generally that cost is higher, the reasonable lightning protection of effect (surge) technology; be representative mainly with companies such as Mitsubishi, SONY, Thomson; be characterized in: the technology more complicated; cost is somewhat expensive; generally they are that this end of tuner at colour TV protects, and the protection few people of power end consider, neither be very comprehensive to the protection of product.
In conjunction with the accompanying drawings, Fig. 1 is the lightning prevention circuit schematic diagram of Mitsubishi.Mainly be on the basis of anti-surge harassing and wrecking circuit commonly used, to have increased by two piezo-resistances that model is VDR471-7 among the figure, with a high-tension gas discharge tube, the discharge voltage of this discharge tube is 7800V, and X capacitor C 801 is after fuse.The appearance that this mode can only be accomplished about 4000V to the voltage protection of power end, but the protection voltage ratio to tuner is higher, can reach more than the 10KV, and shortcoming is when voltage is between the 3000V-7800V, entire circuit is idle, so be comprehensive inadequately to the protective action of machine.
Along with constantly popularizing of colour TV, its sale region also constantly enlarges, and developed country is arranged; backward third world countries are also arranged; the city is arranged, remote rural area is also arranged, though these area condition differences; but substantially all exist the situation of thunderbolt to take place; how to protect television set or display device fully and effectively, the otherness in the face of various areas makes television set and display device can adapt to various place; satisfy different needs, remain the problem that the developer pays close attention to and studies.
Summary of the invention
Therefore, the present invention is after the defective of having analyzed existing lightning protection circuit, according to lightning protection needs and circuit theory, a kind of novel lightning protecting (surge) device is provided, this device utilizes the electromagnetic property and the novel circuit design of conjugation inductance, the energy of multi-level attenuation by absorption lightning surge voltage step by step cleverly.
Another object of the present invention provides a kind of novel lightning protecting device that is applied to display device, and this device can have been realized the comprehensive anti-lightning strike surge harassing and wrecking of similar electronic equipments such as colour TV cheaply.
Another object of the present invention provides a kind of novel lightning protecting device that is applied to display device; this apparatus features is to make colour TV and similar electronic equipment more effective more comprehensively than prior art to the protection of lightning surge; it both can protect colour TV to be unlikely to be damaged because of the first end of high frequency is struck by lightning, and can protect power supply one end again and be damaged because of being struck by lightning.
Based on this, the present invention is achieved in that
A kind of novel lightning protecting device that is applied to display device comprises the fuse that is serially connected with on the L line, it is characterized in that this device also includes:
A resistance, cross-over connection absorbs surge energy between two power line L and N after fuse;
A conjugation inductance, two coil are serially connected with respectively on the fuse L and two power lines of N afterwards, stop the surprise attack of surge energy;
Between a resistance, cross-over connection L and N two lines after the conjugation inductance, further absorb surge energy;
A discharge tube and a resistance series connection constitute a branch road, absorb energy by resistance when discharge tube discharges.
The described novel lightning protecting device that is applied to display device, the branch road that its above-mentioned discharge tube and resistance series connection form is parallel to the two ends of that conjugation inductance coil on the L line, the ingenious voltage of reflection surge on it that utilizes causes the discharge tube discharge, and consumes the energy of surge in discharge paths.
And, for the requirement condition of concrete above-mentioned components and parts be:
Fuse adopts time lagged type glass tube packing forms.
Resistance before the conjugation inductance adopts glass uranium resistance.
Resistance after the conjugation inductance adopts piezo-resistance.
The resistance of connecting with discharge tube adopts noninductive resistance.
Discharge tube adopts glass discharge vessel.
In addition, the input of power supply can not add electric capacity before the conjugation inductance.
Secondly, fuse seals in this phase of discharge tube.Help better protection fuse and complete machine.
Adopt lightning proof of the present invention, utilized the electromagnetic property of conjugation inductance cleverly, effectively the power end and the high frequency head end of machine are protected, and can protective device stand high voltage surge harassing and wrecking repeatedly and do not damage, and in conjunction with the impact of multipole reduction lightning surge, can make colour TV and similar electronic equipment more effective more comprehensively than prior art to the protection of lightning surge, it both can protect colour TV to be unlikely to be damaged because of the first end of high frequency is struck by lightning, and can protect power supply one end again and be damaged because of being struck by lightning;
Lightning proof of the present invention can bear the above voltage of 6600V (according to the detection that has domestic instrument now, under existing testing conditions the full load voltage 6600V of checkout equipment to this device less than the influence) harassing and wrecking, all higher than the withstand voltage of existing product.Existing lightning prevention circuit or device generally can only accomplish to prevent the thunderbolt about 4000V.
Lightning proof of the present invention is able to take surge impact repeatedly, and after tested, its power end can bear (L-N) 20 times, and 40 times (G-L G-N), adds up to 60 times high seas to gush impact to the high frequency head end.
In addition, lightning proof provided by the invention only is made of simple circuit, and the electronic devices and components cost is low, makes this installation cost only be equivalent to 1/3rd of existing lightning prevention circuit or device.
In sum; the present invention has cheap cost and excellent anti-lightning strike performance; influence to its equipment of protecting fully can prevent to be struck by lightning; the present invention is arranged in television set or the display device; can accomplish that all color TV setses and display device all possess all weather operations performance; therefore, this novel lightning protecting device has very application prospects.
Description of drawings
Fig. 1 has anti-lightning strike surge circuit theory diagrams now,
Fig. 2 circuit structure diagram of the present invention.
Embodiment
Novel lightning protecting of the invention process (surge) harassing and wrecking device as shown in Figure 2.
The fuse F801 of the 250Vac 2A of a time lagged type glass tube packing forms is serially connected with on the mains switch L line afterwards;
The glass uranium resistance R 802 of a 1M 1/2W, cross-over connection is between L and N two lines after fuse F801, and surge voltage is at first just released by it after power supply one end pours in;
A conjugation inductance T801, two coil are serially connected with respectively on the fuse F801 L and two power lines of N afterwards;
The piezo-resistance VDR801 of a 470V Φ 14 between the L and N two lines of cross-over connection after the conjugation inductance, further absorbs the excess energy that passes to the back level;
Rated voltage is after the noninductive resistance RST801 series connection of ± 15% glass discharge vessel GST801 and one 220 Ω 1/2W for the 300V error amount, be parallel to the two ends of that conjugation inductance coil on the L line again, discharge tube discharge when surge voltage reaches the specified discharge voltage of discharge tube is absorbed by the noninductive resistance of series connection and the energy of the surge voltage that decays this moment.
The such circuit arrangement that draws by test of many times research makes the surge voltage of scurrying into from the outside through once and again again and its influence is finally eliminated in three attenuation by absorption, and the circuit of protection back is not damaged.
Other components and parts do not have specific (special) requirements as general device.The conjugation inductance is the device that plays the crux effect in this circuit.
The principle of the present embodiment and the course of work are: (is to describe foundation with the test process)
Act on machine with the surging signal of a simulation and test the protective action of analytical equipment.Used test signal is the composite wave of the 1.2/50us～8/20us among the IEC61000-4-5:1995; The impedance of machine when differential mode and two kinds of input mode tests of common mode is 12 Ω.
At first test by difference-mode input from power end, after disturbance voltage was come in from L and N, at first by resistance R 802 some energy of releasing, this was a first line of defence; After this run into conjugation inductance T801, according to electromagnetic induction principle, voltage between the pin of inductance T801 two ends rises rapidly, rather than pass to late-class circuit by circuit at once, after the voltage between the inductance T801 bipod surpassed the discharge voltage (300V) of discharge tube GST801, discharge tube began discharge, and this moment, the noninductive resistance by series connection absorbed and the decay surge energy, thereby reach the effect of protection late-class circuit, this is defence line, second road; Discharge tube discharge, just absorb and bypass part energy wherein, when the disturbance voltage higher-energy of importing more for a long time, still have unnecessary energy and cross late-class circuit, so, as the three lines of defence, VDR801 starts working, and further carries out energy absorption.By the setting of this three lines of defence, protected device to avoid the damage of lightning surge effectively
Secondly, the situation the when ground of looking at tuner is again tested power end, at this moment, common mode harassing and wrecking waveform is that the Ground from transformer secondary output goes here and there respectively and harasses between the L of power end and the N.
When the harassing and wrecking signal of input is a L end from Ground to the power supply, half inductance of this of L phase can hinder the direction (the Ferrari law of electromagnetic induction) that electric current changes so.Thereby the both end voltage difference of inductance coil is raise, and when being elevated to discharge voltage 300V, discharge tube begins discharge so, releases and absorbs energy.
When the harassing and wrecking signal of input is a N end from Ground to the power supply, half inductance of this of N phase can hinder the direction (Ferrari electromagnetic laws) that electric current changes so.But the winding method of conjugation inductance be two-wire and around, coupling is closely, and is opposite with the inscription end.According to (the Ferrari law of electromagnetic induction); electromagnetic coupled effect by the conjugation inductance; when N went up change in voltage mutually, L went up mutually that can to produce phase place equally opposite, the electromotive force that voltage is identical; so when this voltage reaches 300V; the discharge tube of L phase can discharge, release and absorb energy, the voltage clamp of L phase below 300V; thereby, reach the effect of protection late-class circuit from face also just the level of the voltage clamp of N phase at 300V.
Like this, exactly the Conversion of energy of common mode harassing and wrecking is become the energy of differential mode, discharge by discharge tube then.When carrying out the common mode test certainly,,,, mainly be the protection high voltage so electric current is very little because the impedance between the primary and secondary is very big owing to be the harassing and wrecking of between transformer is primary and secondary, carrying out.Because actual energy is not very high, so protection can be many easily.
The concrete model of each parts is among Fig. 2:
1, F801 is the time lagged type fuse of 250Vac 2A, is to use the glass tube packing forms.
2, R802 is the glass uranium resistance of 1M 1/2W, mainly has been the voltage effect of releasing.
3, T801 is a conjugation inductance coil, is the components and parts that play the crux effect in this circuit.
4, GST801 is that a 300V error amount is ± 15% glass discharge vessel.
5, RST801 is the noninductive resistance of one 220 Ω 1/2W.
6, VDR801 is the piezo-resistance of a 470V Φ 14.
The surge test result of the invention process lightning protection (surge) circuit is as follows:
More than test is carried out when TV is normally watched, after the test, functions such as the image of television set, sound are normal.
| The input mode of surge | Test condition | The waveform angle of input electrical network | Impact number of times | The state of machine |
| Common mode L1---PE (power line L1 is to the ground end of tuner) | The test pulse of 6600V/12 Ω input be-just-bear | 90° | 10 | There is not any damage |
| 270° | 10 | There is not any damage | ||
| Common mode L2---PE (power line L2 is to the ground end of tuner) | The test pulse of 6600V/12 Ω input be-just-bear | 90° | 10 | There is not any damage |
| 270° | 10 | There is not any damage | ||
| Differential mode L---N (between the two-phase of power line) | The test pulse of 6600V/12 Ω input be-just-bear | 90° | 10 | There is not any damage |
| 270° | 10 | There is not any damage |
Compared with prior art, the present embodiment mainly contains following characteristics:
1, do not connecing X electric capacity behind the fuse with before the conjugation inductance, this point obviously is different from prior art.The purpose of doing like this is to prevent that X electric capacity is at first breakdown, thereby the protection fuse does not damage.If insurance damages, machine also just can not directly use again;
2, utilized the electromagnetic property of conjugation inductance cleverly, effectively the power end and the high frequency head end of machine have been protected, and can protective device have stood high voltage surge harassing and wrecking repeatedly and do not damage;
3, piezo-resistance VDR801 is placed after the conjugation inductance T801.Prior art generally is that piezo-resistance is placed on before the conjugation inductance after the fuse.So also just more favourable protection fuse, effectively protected complete machine simultaneously.
4, in coil two ends of conjugation inductance discharge paths in parallel, the voltage at inductance coil two ends is carried out effective clamper, energy is absorbed.
What need supplementary notes is: the input of power supply can not add X electric capacity before the conjugation inductance.Certain EMC that wants can be up to standard, otherwise X electric capacity is at first breakdown, and fuse can be breakdown.Because the reaction speed of X electric capacity is more faster than the voltage rising at inductance two ends, is the ns level.
Fuse seals in this phase of discharge tube.Help better protection fuse and complete machine.
In a word, advantage of the invention process is:
1, power end and the high frequency head end to machine carried out the protection of both direction.The external overwhelming majority only protects a direction.
2, can bear the higher voltage harassing and wrecking, all more than 6600V (because domestic instrument now can only be surveyed so high voltage), general machine all can only be accomplished about 4000V.
3, this method can tolerate surge impact repeatedly, power end 20 times (L-N), and 40 times (G-L G-N), adds up to 60 times high seas to gush impact to the high frequency head end.
4, the charge is small for components and parts, and be general-purpose device, has extraordinary cost performance.
Claims (8)
1 one kinds of novel lightning protecting devices that are applied to display device comprise the fuse that is serially connected with on the L line, it is characterized in that this device also includes:
A resistance, cross-over connection absorbs surge energy between two power line L and N after fuse;
A conjugation inductance, two coil are serially connected with respectively on the fuse L and two power lines of N afterwards, stop the surprise attack of surge energy;
Between a resistance, cross-over connection L and N two lines after the conjugation inductance, further absorb surge energy;
A discharge tube and a resistance series connection constitute a branch road, absorb energy by resistance when discharge tube discharges.
2 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that the branch road of above-mentioned discharge tube and resistance series connection formation is parallel to the two ends of the conjugation inductance coil on the L line.
3 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that fuse adopts time lagged type glass tube packing forms.
4 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that the resistance before the conjugation inductance adopts glass uranium resistance.
5 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that the resistance after the conjugation inductance adopts piezo-resistance.
6 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that the resistance of connecting with discharge tube adopts noninductive resistance.
7 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that discharge tube adopts glass discharge vessel.
8 novel lightning protecting devices that are applied to display device as claimed in claim 1 is characterized in that the input of power supply can not adding electric capacity before the conjugation inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100772427A CN100444491C (en) | 2004-12-01 | 2004-12-01 | Novel lightning protecting device used for display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100772427A CN100444491C (en) | 2004-12-01 | 2004-12-01 | Novel lightning protecting device used for display device |
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| Publication Number | Publication Date |
|---|---|
| CN1783630A true CN1783630A (en) | 2006-06-07 |
| CN100444491C CN100444491C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100772427A Expired - Fee Related CN100444491C (en) | 2004-12-01 | 2004-12-01 | Novel lightning protecting device used for display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993332A (en) * | 2015-08-04 | 2015-10-21 | 温州骋航电器有限公司 | Miniature electric leakage protection socket |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2039073U (en) * | 1988-10-13 | 1989-06-07 | 刘行俊 | T.v. receiver protector |
| US4999729A (en) * | 1989-08-09 | 1991-03-12 | Stifter Francis J | Satellite receiver protection apparatus |
| CN2261102Y (en) * | 1996-04-23 | 1997-08-27 | 詹富旺 | Thunder-proof ultra-voltage protector |
| JP3858470B2 (en) * | 1998-08-21 | 2006-12-13 | ソニー株式会社 | Lightning strike protection circuit |
| CN2439737Y (en) * | 2000-07-07 | 2001-07-18 | 贵阳诚聚电子有限公司 | Device for preventing house keeping electric appliance from being struck by lightning |
| JP2002064932A (en) * | 2000-08-16 | 2002-02-28 | Sony Corp | Electronic quipment and discharging circuit therefor |
| CN2465376Y (en) * | 2001-01-12 | 2001-12-12 | 章城阳 | Arrester for TV set |
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2004
- 2004-12-01 CN CNB2004100772427A patent/CN100444491C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993332A (en) * | 2015-08-04 | 2015-10-21 | 温州骋航电器有限公司 | Miniature electric leakage protection socket |
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| CN100444491C (en) | 2008-12-17 |
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