CN100546355C - A kind of power-off sequential protection circuit of flat-plate television power supply - Google Patents
A kind of power-off sequential protection circuit of flat-plate television power supply Download PDFInfo
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- CN100546355C CN100546355C CNB2007100738311A CN200710073831A CN100546355C CN 100546355 C CN100546355 C CN 100546355C CN B2007100738311 A CNB2007100738311 A CN B2007100738311A CN 200710073831 A CN200710073831 A CN 200710073831A CN 100546355 C CN100546355 C CN 100546355C
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Abstract
The invention discloses a kind of power-off sequential protection circuit of flat-plate television power supply, relate to the flat-plate television power supply technical field.This circuit comprises switching tube Q1, switching tube Q2 and rectification and voltage division module, described rectification and voltage division module is carried out rectification and dividing potential drop to power supply input AC electricity, its voltage division signal output is electrically connected with the base stage of described switching tube Q1, the grounded emitter of described switching tube Q1, its collector electrode is connected with chip power supply power supply VCCP, described voltage division signal is controlled conducting or the shutoff of described switching tube Q1, the drain electrode of described switching tube Q2 connects the feedback end VFB of control board output signal, its source ground, its grid connects the collector electrode of described switching tube Q1.The present invention can avoid panel TV display screen behind the input instant power-down flower screen phenomenon of image disorder to occur.
Description
[technical field]
The present invention relates to the flat-plate television power supply technical field, particularly the power-off sequential protection circuit of flat-plate television power supply.
[background technology]
Flat-plate television power supply comprises LCD (Liquid Crystal Display LCD) power supply and PDP (Plasma Display Panel plasma scope) power supply, is to develop industry more rapidly in recent years.Panel TV generally is divided into three parts: power supply, control board and screen, as shown in Figure 1, wherein, power supply is given control board and screen power supply, and power supply will have the certain time sequence relation could keep smoothness that television image exports and clear.Especially PDP power supply, its output way is generally many, and the sequence circuit that relates to is just more complicated.
The sequence problem that flat-plate television power supply starts generally solves than being easier to, and some uses Single-chip Controlling now, and it is simpler that problem just becomes, but for power-off sequential, relative complex just becomes.In the prior art, the mode of screen control generally adopts the band memory style, be any state before the shutdown promptly, start also is any state once more, it before the shutdown holding state/normal condition, also holding state/normal condition after the start, like this when the input power down of power supply or rapid on/off machine, because the electrochemical capacitor discharge causes the control board continued power, and the voltage of screen has dropped to outside the normal range of operation, the phenomenon of flower screen will appear in this moment, cause a kind of illusion that fault crashes of shielding to the people,, the phenomenon that the lamp of standby can not extinguish immediately after the power down can occur simultaneously because the control board continued power.The generation of these phenomenons is infinitely amplified by the consumer sometimes, thereby becomes the deciding factor that the consumer abandons buying this series products.This is the problem that always perplexs complete-system vendor.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of power-off sequential protection circuit of flat-plate television power supply, solves the flower screen phenomenon that the image disorder appears in panel TV display screen behind the input instant power-down from the source.
Technical scheme of the present invention is:
A kind of power-off sequential protection circuit of flat-plate television power supply is characterized in that: comprise switching tube Q1, switching tube Q2 and rectification and voltage division module, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor; Described rectification and voltage division module is carried out rectification and dividing potential drop to power supply input AC electricity, its voltage division signal output is electrically connected with base stage or the grid of described switching tube Q1, the emitter of described switching tube Q1 or source ground, its collector electrode or drain electrode are connected with chip power supply power supply VCCP, described voltage division signal is controlled conducting or the shutoff of described switching tube Q1, the drain electrode of described switching tube Q2 or collector electrode connect the feedback end VFB of control board output signal, its source electrode or grounded emitter, its grid or base stage connect collector electrode or the drain electrode of described switching tube Q1; Described rectification and voltage division module comprises resistance R 1, resistance R 2 and diode D1, one end of described resistance R 1 is as the sampling end of power supply input AC electricity, its other end connects the anode of diode D1, the negative electrode of diode D1 is by described resistance R 2 ground connection, and the tie point of described diode D1 and resistance R 2 is as described voltage division signal output.
The power-off sequential protection circuit of described a kind of flat-plate television power supply; described rectification and voltage division module comprises resistance R 1, resistance R 2 and diode D1; one end of described resistance R 1 is as the sampling end of power supply input AC electricity; its other end connects the anode of diode D1; the negative electrode of diode D1 is by described resistance R 2 ground connection, and the tie point of described diode D1 and resistance R 2 is as described voltage division signal output.
The power-off sequential protection circuit of described a kind of flat-plate television power supply also comprises capacitor C 1, and an end of described capacitor C 1 connects described voltage division signal output, its other end ground connection.
The power-off sequential protection circuit of described a kind of flat-plate television power supply also comprises voltage-stabiliser tube Z1, and its negative electrode connects described voltage division signal output, its plus earth.
The power-off sequential protection circuit of described a kind of flat-plate television power supply also comprises resistance R 3, and described voltage division signal output is connected with base stage or the grid of described switching tube Q1 by described resistance R 3.
The power-off sequential protection circuit of described a kind of flat-plate television power supply also comprises resistance R 4, and the collector electrode of described switching tube Q1 or drain electrode are connected with chip power supply power supply VCCP by described resistance R 4.
Described flat-plate television power supply is LCD power supply or PDP power supply.
The invention has the beneficial effects as follows:
In the power-off sequential protection circuit of the present invention; by when the power down; the feedback of corresponding regulation control plate output signal; thereby make the control board no-output; so just can avoid occurring the flower screen phenomenon that the image disorder appears in panel TV display screen behind the input instant power-down, the corresponding attraction of panel TV product that strengthened to the consumer.Circuit structure of the present invention is simple, is easy to realize.
[description of drawings]
Fig. 1 is the structure principle chart of panel TV.
Fig. 2 is circuit theory diagrams of the present invention (one).
Fig. 3 is circuit theory diagrams of the present invention (two).
Fig. 4 is circuit theory diagrams of the present invention (three).
[embodiment]
Below in conjunction with drawings and Examples the present invention is further set forth:
The power-off sequential protection circuit of a kind of flat-plate television power supply provided by the invention; its basic ideas are when power down; feedback by regulation control plate output; thereby control board output is broken rapidly in power down, thereby solve in the prior art flower screen phenomenon that the image disorder appears in behind input instant power-down display screen.
Power-off sequential protection circuit figure of the present invention (one) as shown in Figure 2; this circuit comprises switching tube Q1; switching tube Q2; resistance R 1; resistance R 2; resistance R 3; resistance R 4; capacitor C 1; diode D1 and voltage-stabiliser tube Z1; wherein; switching tube Q1 selects triode for use; switching tube Q2 selects metal-oxide-semiconductor for use; resistance R 1; resistance R 2 and diode D1 constitute a rectification and voltage division module; this rectification and voltage division module is carried out rectification and dividing potential drop to power supply input AC electricity; the tie point of described diode D1 and resistance R 2 is as described voltage division signal output; conducting or shutoff by voltage division signal control switch pipe Q1; one end of resistance R 1 is as the sampling end of power supply input AC electricity AC; the anode of its another terminating diode D1; the negative electrode of diode D1 connects the base stage of switching tube Q1 by resistance R 3; the grounded emitter of switching tube Q1; the two ends of capacitor C 1 and resistance R 2 all are connected across respectively on the emitter of the negative electrode of diode D1 and switching tube Q1; the negative electrode of voltage-stabiliser tube Z1 connects the negative electrode of diode D1; its anode connects the emitter of switching tube Q1; chip power supply power supply VCCP connects the collector electrode of switching tube Q1 by resistance R 4; the drain electrode of switching tube Q2 connects the feedback end VFB of control board output signal; its source ground, its grid connects the collector electrode of described switching tube Q1.
Operation principle of the present invention is: diode D1 carries out rectification to the alternating current of sampling, resistance R 1 and resistance R 2 are formed bleeder circuit, voltage-stabiliser tube Z1 plays pressure stabilization function, 1 effect of playing filtering of capacitor C, by the monolateral sampling of AC voltage being measured the electric power thus supplied of alternating current at this moment, power-down state in this way, then diode D1 ends, make not conducting of switching tube Q1, and then switching tube Q2 conducting, will drag down the feedback end VFB of control board output this moment, the control board of panel TV has just lost power supply like this, the control no-output of control board to shielding, thus avoid occurring falling spark plate and the colored problem of shielding of high-speed switch machine, and because the disappearance of standby voltage, the indicator light of control board standby also extinguishes naturally.
In the present invention, switching tube Q1 and switching tube Q2 can be triodes, can all be metal-oxide-semiconductors also, can also one of them be triode, another be a metal-oxide-semiconductor, all being that triode is an example, its circuit theory diagrams can be realized purpose of the present invention equally referring to Fig. 3.
It is to be noted that in Fig. 3 the diode D1 of rectification and voltage division module and the position of resistance R 1 can exchange, its schematic diagram as shown in Figure 4, equally, the position of diode D1 and resistance R 1 also can exchange among Fig. 2, and at this moment, the tie point of resistance R 1 and resistance R 2 is as described voltage division signal output.In Fig. 4, the anode of diode D1 is as the sampling end of power supply input AC electricity AC, the negative electrode of diode D1 is successively by resistance R 1 and resistance R 2 ground connection, the tie point of resistance R 1 and resistance R 2 is connected the base stage of switching tube Q1 by resistance R 3, the grounded emitter of switching tube Q1, the negative electrode of voltage-stabiliser tube Z1 connects the tie point of resistance R 1 and resistance R 2, and its anode connects the emitter of switching tube Q1, and capacitor C 1 is in parallel with resistance R 2.Circuit shown in Figure 4 carries out rectification by diode D1 earlier, carries out dividing potential drop by resistance R 1 and resistance R 2 again, the operation principle of the same Fig. 2 of other operation principle, circuit shown in Figure 3.
The present invention not only is fit to LCD power supply and PDP power supply, and needs the power supply of similar functions to be fit to too to other.Particularly be applied to the input under-voltage protecting circuit of power supply, promptly judge by input voltage sampling, if import under-voltagely, just the feedback end of output signal is dragged down, principle is the same.
In sum, the power-off sequential protection circuit of a kind of flat-plate television power supply provided by the present invention, circuit structure is simple, is easy to realize, can avoid panel TV display screen behind the input instant power-down flower screen phenomenon of image disorder to occur.
Claims (7)
1, a kind of power-off sequential protection circuit of flat-plate television power supply is characterized in that: comprise switching tube Q1, switching tube Q2 and rectification and voltage division module, described switching tube Q1 is triode or metal-oxide-semiconductor; Described switching tube Q2 is triode or metal-oxide-semiconductor; Described rectification and voltage division module is carried out rectification and dividing potential drop to power supply input AC electricity, its voltage division signal output is electrically connected with base stage or the grid of described switching tube Q1, the emitter of described switching tube Q1 or source ground, its collector electrode or drain electrode are connected with chip power supply power supply VCCP, described voltage division signal is controlled conducting or the shutoff of described switching tube Q1, the drain electrode of described switching tube Q2 or collector electrode connect the feedback end VFB of control board output signal, its source electrode or grounded emitter, its grid or base stage connect collector electrode or the drain electrode of described switching tube Q1; Described rectification and voltage division module comprises resistance R 1, resistance R 2 and diode D1, one end of described resistance R 1 is as the sampling end of power supply input AC electricity, its other end connects the anode of diode D1, the negative electrode of diode D1 is by described resistance R 2 ground connection, and the tie point of described diode D1 and resistance R 2 is as described voltage division signal output.
2, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 1 is characterized in that: also comprise capacitor C 1, an end of described capacitor C 1 connects described voltage division signal output, its other end ground connection.
3, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 2 is characterized in that: also comprise voltage-stabiliser tube Z1, its negative electrode connects described voltage division signal output, its plus earth.
4, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 3 is characterized in that: also comprise resistance R 3, described voltage division signal output is connected with base stage or the grid of described switching tube Q1 by described resistance R 3.
5, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 4 is characterized in that: also comprise resistance R 4, the collector electrode of described switching tube Q1 or drain electrode are connected with chip power supply power supply VCCP by described resistance R 4.
6, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 1 is characterized in that: described flat-plate television power supply is LCD power supply or PDP power supply.
7, the power-off sequential protection circuit of a kind of flat-plate television power supply according to claim 5 is characterized in that: described flat-plate television power supply is LCD power supply or PDP power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100738311A CN100546355C (en) | 2007-04-06 | 2007-04-06 | A kind of power-off sequential protection circuit of flat-plate television power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100738311A CN100546355C (en) | 2007-04-06 | 2007-04-06 | A kind of power-off sequential protection circuit of flat-plate television power supply |
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| Publication Number | Publication Date |
|---|---|
| CN101043605A CN101043605A (en) | 2007-09-26 |
| CN100546355C true CN100546355C (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100738311A Active CN100546355C (en) | 2007-04-06 | 2007-04-06 | A kind of power-off sequential protection circuit of flat-plate television power supply |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103476175B (en) * | 2013-09-06 | 2015-06-24 | 惠州三华工业有限公司 | LED backlight circuit of liquid crystal display screen |
| CN108377303B (en) * | 2018-01-17 | 2020-05-12 | 苏州摩联通信技术有限公司 | Modem and power supply method of modem |
| CN110231862B (en) * | 2018-03-06 | 2022-10-28 | 佛山市顺德区顺达电脑厂有限公司 | Server system with power failure protection function and method thereof |
| CN109905619B (en) | 2019-02-19 | 2020-10-23 | 海信视像科技股份有限公司 | Display device |
| CN113131912B (en) * | 2021-04-27 | 2023-03-24 | 微山县微山湖微电子产业研究院有限公司 | Drive fault protection circuit |
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| CN101043605A (en) | 2007-09-26 |
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Effective date of registration: 20120202 Address after: 518055, Guangdong, Shenzhen province Nanshan District Xian Road, No. 1268, crown Yao Ling industrial north 4, building 6, East Patentee after: Shenzhen Shinry Technolgies Co., Ltd. Address before: 518057, No. 208, Fangda building, twelve South tech Road, Shenzhen hi tech Industrial Park, Guangdong, China Patentee before: Wu Renhua |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park C1 building 14 floor Patentee after: Shenzhen Shinry Technology Co., Ltd. Address before: 518055, Guangdong, Shenzhen province Nanshan District Xian Road, No. 1268, crown Yao Ling industrial north 4, building 6, East Patentee before: Shenzhen Shinry Technolgies Co., Ltd. |