CN200953586Y - Switch off spot suppressor - Google Patents
Switch off spot suppressor Download PDFInfo
- Publication number
- CN200953586Y CN200953586Y CN 200620010456 CN200620010456U CN200953586Y CN 200953586 Y CN200953586 Y CN 200953586Y CN 200620010456 CN200620010456 CN 200620010456 CN 200620010456 U CN200620010456 U CN 200620010456U CN 200953586 Y CN200953586 Y CN 200953586Y
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- triode
- positive
- npn type
- shutdown
- negative
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Abstract
The utility model discloses a shutdown bright spot elimination circuit, which comprises a DC power source and a R, G and B signal output circuit. One route of the DC power source is connected to a base pole of a PNP type triode and its another route is connected to the emitting pole of the triode via one side of a switching diode; its another side is grounded via an energy storage capacitor. The collector pole of the PNP triode is connected to a base pole of a NPN type triode; the emitting pole of the NPN type triode is grounded; the collector pole of the NPN type triode is respectively connected to three output poles of the R, G and B signal output circuits. The utility model, by adopting the principle that no mutation occurs to the voltage at the two ends of the capacitor, is able to ensure that when the TV set is turned off, the electricity stored in the capacitor is utilized to connect the PNP and NPN type triodes for a while, then pull down the level of the three output poles of the R, G and B signal output circuits, so as to realize that the voltage at three cathodes fast reach to the cut-off voltage and cut off the current for the cathode, thus inhibiting the emitting of electron beam and eliminating the bright spot during shutdown.
Description
Technical field
The utility model belongs to technical field of television sets, relates to a kind of improvement of TV set circuit, specifically, relates to a kind of shutdown spot suppressor that is used for television set.
Background technology
Traditional television set is after shutdown, and filament still keeps higher temperature, if anode high voltage is failed timely bleed off and fallen, negative electrode will continue emitting electrons under the effect of anode high voltage, and this moment, row-field scanning quit work, and electron beam will the direct projection picture tube, produced off-spot.Off-spot is bigger to the influence of picture tube, might cause the damage of picture tube, and machine life is reduced.At present, the approach that solves off-spot is exactly to shut down moment, after row-field scanning quits work, makes cathode electronics stop emission.Usually adopt dual mode to be realized: bleed off type shutdown spot suppressor and cut-off type shutdown spot suppressor.Bleed off type shutdown spot suppressor is after shutdown, and line-field sweep circuit also when work, increases line rapidly, and the quick bleed off of anode high voltage is fallen, and cathode current can not be launched, and eliminates bright spot.And cut-off type shutdown spot suppressor is when shutdown, by improving cathode potential or reducing first grid (G1) current potential etc., cathode current is ended, to reach the purpose of shutdown bright-spot eliminating.The general structure of shutdown spot suppressor that is adopted in present TV set circuit is complicated, not only bad for the global design of Core of TV set circuit board, and the production cost of the tv product that raise, reduced its market competitiveness.
Summary of the invention
The utility model is in order to solve the shutdown of television set in prior art spot suppressor complex structure, problem that cost is high, provide a kind of novel TV machine-operated machine spot suppressor, adopt simple discrete device to form cut-off type shutdown spot suppressor, effectively eliminated off-spot, prolong the useful life of picture tube, improved the reliability of tv product.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of shutdown spot suppressor, comprise DC power supply and R, G, B signal output apparatus, described DC power supply one tunnel connects the base stage of a positive-negative-positive triode, and another road connects the emitter of described triode on the one hand through switching diode, on the other hand through storage capacitor ground connection; The collector electrode of described positive-negative-positive triode connects the base stage of a NPN type triode; The grounded emitter of described NPN type triode, collector electrode connect three output stages of described R, G, B signal output apparatus respectively.
After the television set shutdown, the electric current of storage capacitor is by described positive-negative-positive triode bleed off, and the anode of described switching diode connects described DC power supply, and negative electrode connects the emitter of described positive-negative-positive triode.The potential value of described DC power supply is+9V, connects the base stage of described positive-negative-positive triode by a resistance, also is connected with a resistance between the base stage of the collector electrode of described positive-negative-positive triode and NPN type triode.
, the voltage of R, G, three output stages of B in time can be dragged down after shutdown in order to ensure television set, the collector electrode of described NPN type triode connects three output stages of R, G, B signal output apparatus respectively through three diodes; Wherein, the anode of three diodes is connected one to one with three output stages of R, G, B signal output apparatus respectively, and negative electrode all connects the collector electrode of described NPN type triode.
Compared with prior art, advantage of the present utility model and good effect are: the principle that the utility model utilizes the electric capacity both end voltage not suddenly change, make television set when shutdown, controlling electric energy positive-negative-positive triode and NPN type triode conducting a period of time of utilizing electric capacity to store, and then drag down the current potential of R, G, three output stages of B, make back three cathode voltages of shutdown reach cut-ff voltage rapidly, the blocking-up cathode current, thereby suppressed the emission of electron beam, eliminated the generation of off-spot.Shutdown spot suppressor of the present utility model is simple in structure, with low cost, and effect is remarkable, and the movement circuit of composition off-spot and variegation all do not occur when being used with multiple picture tube, effectively protected picture tube, has prolonged the useful life of tv product.
Description of drawings
Fig. 1 is the schematic diagram of the utility model television set shutdown spot suppressor.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
The utility model adopts discrete component to form cut-off type shutdown spot suppressor, output at shutdown moment blocking-up R, G, B signal, make three cathode voltages reach cut-ff voltage rapidly, thereby reach the purpose of shutdown bright-spot eliminating, its concrete structure is referring to shown in Figure 1.
Among Fig. 1 ,+9V DC power supply connects the base stage of positive-negative-positive triode VX02 on the one hand through resistance R X02, is connected the emitter of positive-negative-positive triode VX02 on the other hand with switching diode VDX01 through the resistance R X01 of series connection.The anode of described switching diode VDX01 is through resistance R X01 connection+9V DC power supply, and negative electrode connects the emitter of described positive-negative-positive triode VX02.Be connected with a storage capacitor CX01 between the emitter of described positive-negative-positive triode VX02 and ground, the collector electrode of triode VX02 then links to each other with the base stage of a NPN type triode VX01 through series resistance RX03.The grounded emitter of described NPN type triode VX01, collector electrode are connected with integrated circuit R, G, three output stages of B one to one through diode VDX02, VDX03, VDX04 respectively.Wherein, the anode of described diode VDX02, VDX03, VDX04 connects R, G, three output stages of B respectively, and negative electrode connects the collector electrode of described NPN type triode VX01.
Its operation principle is: when the television boot-strap operate as normal ,+9V DC power supply is charged to electrochemical capacitor CX01 by resistance R X01 and switching diode VDX01, and the voltage of capacitor C X01 two interpolars is+8.3V.At this moment, the base voltage of positive-negative-positive triode VX02 is+9V, because base voltage is than emitter voltage height, do not satisfy turn-on condition, therefore, triode VX02 is in cut-off state, and then make NPN type triode VX01 also be in cut-off state, three road R, G, B signal are normally exported, and by three cathode emission electron beams of rear-class video amplifying circuit driving picture tube, the control chart picture is normally exported.
When hard shutdown of television set or remote-control closedown ,+9V voltage rapidly disappears, and becomes 0V, and electrochemical capacitor CX01 discharge is because the existence of switching diode VDX01 makes that the voltage on the capacitor C X01 can not drop to 0V, but remains on+8.3V at once.At this moment, the emitter voltage of triode VX02 is higher than base voltage, positive-negative-positive triode VX02 conducting, capacitor C X01 discharges by triode VX02, make NPN type triode VX01 saturation conduction, three output stage voltages of integrated circuit RGB are dragged down by diode VDX02, VDX03, VDX04 and triode VX01 at once, make back three cathode voltages of shutdown reach cut-ff voltage rapidly, thereby make television set emission of blocking-up electron beam rapidly in shutdown process, reached the purpose of shutdown bright-spot eliminating.
Shutdown spot suppressor of the present utility model is simple in structure, with low cost, and effect is remarkable, has not only effectively prolonged the useful life of picture tube, and has improved the reliability of complete machine, has strengthened the market competitiveness of tv product.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (6)
- One kind the shutdown spot suppressor, comprise DC power supply and R, G, B signal output apparatus, it is characterized in that: described DC power supply one tunnel connects the base stage of a positive-negative-positive triode, and another road connects the emitter of described triode on the one hand through switching diode, on the other hand through storage capacitor ground connection; The collector electrode of described positive-negative-positive triode connects the base stage of a NPN type triode; The grounded emitter of described NPN type triode, collector electrode connect three output stages of described R, G, B signal output apparatus respectively.
- 2. shutdown spot suppressor according to claim 1 is characterized in that: the anode of described switching diode connects described DC power supply, and negative electrode connects the emitter of described positive-negative-positive triode.
- 3. shutdown spot suppressor according to claim 1 and 2 is characterized in that: the collector electrode of described NPN type triode connects three output stages of R, G, B signal output apparatus respectively through three diodes; Wherein, the anode of three diodes is connected one to one with three output stages of R, G, B signal output apparatus respectively, and negative electrode all connects the collector electrode of described NPN type triode.
- 4. shutdown spot suppressor according to claim 3 is characterized in that: be connected with a resistance between the base stage of described positive-negative-positive triode and DC power supply.
- 5. shutdown spot suppressor according to claim 4 is characterized in that: be connected with a resistance between the base stage of the collector electrode of described positive-negative-positive triode and NPN type triode.
- 6. shutdown spot suppressor according to claim 1 is characterized in that: the potential value of described DC power supply is+9V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620010456 CN200953586Y (en) | 2006-09-26 | 2006-09-26 | Switch off spot suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620010456 CN200953586Y (en) | 2006-09-26 | 2006-09-26 | Switch off spot suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200953586Y true CN200953586Y (en) | 2007-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620010456 Expired - Fee Related CN200953586Y (en) | 2006-09-26 | 2006-09-26 | Switch off spot suppressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200953586Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752897A (en) * | 2012-06-26 | 2012-10-24 | 东莞珂立斯电源技术有限公司 | Afterglow eliminating circuit |
| CN102869173A (en) * | 2012-10-17 | 2013-01-09 | 深圳市聚作照明股份有限公司 | Light-emitting diode (LED) drive power supply device |
| CN111667785A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
-
2006
- 2006-09-26 CN CN 200620010456 patent/CN200953586Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752897A (en) * | 2012-06-26 | 2012-10-24 | 东莞珂立斯电源技术有限公司 | Afterglow eliminating circuit |
| CN102869173A (en) * | 2012-10-17 | 2013-01-09 | 深圳市聚作照明股份有限公司 | Light-emitting diode (LED) drive power supply device |
| CN111667785A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
| CN111667785B (en) * | 2020-07-07 | 2023-11-14 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
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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: 20070926 Termination date: 20100926 |