CN2817254Y - Television receiver with bright spot removing circuit at shut-down - Google Patents
Television receiver with bright spot removing circuit at shut-down Download PDFInfo
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- CN2817254Y CN2817254Y CNU2005200865135U CN200520086513U CN2817254Y CN 2817254 Y CN2817254 Y CN 2817254Y CN U2005200865135 U CNU2005200865135 U CN U2005200865135U CN 200520086513 U CN200520086513 U CN 200520086513U CN 2817254 Y CN2817254 Y CN 2817254Y
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Abstract
The utility model discloses a television with a bright spot removing circuit at shutdown, which comprises an R, G, B signal input end, the bright spot removing circuit at shutdown and R, G, B electron guns, wherein a low-voltage DC power supply is connected with a storage capacitor through a forward biased diode in the bright spot removing circuit at shutdown, a positive electrode of the storage capacitor is connected with an emitting electrode of a PNP type triode, a base electrode of the PNP type triode is connected with the low-voltage DC power supply, collecting electrodes are grounded through a drain resistor or are respectively connected with three base electrodes of an NPN type triode, the three base electrodes of an NPN type triode are respectively connected with an R, G, B signal input end, the collecting electrodes are connected with the corresponding R, G, B electron guns and the emitting electrode is connected with the drain resistor. The utility model adopts the simple circuit structure to thoroughly eliminate the bright spot problem at shutdown, largely reduces the maintenance cost, effectively ensures the service life of the TV and increases the reliability of products.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of shutdown spot suppressor of television set.
Background technology
Traditional television set a bright spot can occur usually on shutdown moment screen, this is bigger to the picture tube influence, the service life that can reduce CRT.Address this problem, just must in TV set circuit, set up the shutdown spot suppressor.Common television set spot suppressor or employing bleed off type circuit, adopt the cut-off type circuit, no matter which kind of mode of employing, if it is improper to adjust the parameter of circuit selection, just might produce off-spot, can not eradicate the problem of off-spot up hill and dale, thereby influence the useful life of television set, reduce its reliability.
Summary of the invention
The utility model can occur off-spot for overcoming when television set shuts down in the prior art, and existing spot suppressor can not thoroughly be eradicated the deficiency of this problem, a kind of novel shutdown spot suppressor is provided, thoroughly solved the problem of CRT tv product off-spot by simple circuit configuration, effectively prolong the useful life of television set, guaranteed its reliability.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of television set with shutdown spot suppressor, comprise R, G, B signal input part, shutdown spot suppressor and R, G, B electron gun, wherein, in described shutdown spot suppressor, low-voltage dc power supply links to each other with a storage capacitor through a forward biased diode, the positive pole of described storage capacitor connects the emitter of a positive-negative-positive triode, the base stage of described positive-negative-positive triode connects described low-voltage dc power supply, and collector electrode is through bleeder resistance ground connection or link to each other with the base stage of three road NPN type triodes respectively; The base stage of described three road NPN type triodes connects one road R, G, B signal input part respectively, and collector electrode connects corresponding R, G, B electron gun, and emitter links to each other with described bleeder resistance.
As further qualification to technique scheme, the positive pole of described diode connects low-voltage dc power supply, negative pole links to each other with described storage capacitor through a resistance, the base stage of described positive-negative-positive triode connects described low-voltage dc power supply through another resistance, and collector electrode links to each other with described three road bleeder resistances or links to each other with the base stage of described three road NPN type triodes through three road diodes respectively; Wherein, diode positive pole connect the collector electrode of positive-negative-positive triode, negative pole connects the base stage of bleeder resistance or NPN type triode.
As further limiting again to technique scheme, the base stage of described NPN type triode connects one road R, G, B signal input part through a resistance respectively, collector electrode connects corresponding R, G, B electron gun through a resistance respectively on the one hand, link to each other with a high-voltage DC power supply through another resistance respectively on the other hand, its emitter is respectively through a capacity earth.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by setting up the shutdown spot suppressor between R, G, B signal input part and R, G, B electron gun, thoroughly eradicated the off-spot problem with simple circuit configuration, reduced maintenance cost significantly, effectively guaranteed the useful life of television set, improved the reliability of products and the market competitiveness, had broad application prospects.
Description of drawings
Fig. 1 is the schematic diagram of the utility model cut-off type shutdown spot suppressor;
Fig. 2 is the schematic diagram of the utility model releasing type shutdown spot suppressor.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
In the utility model, two kinds of shutdown spot suppressors are provided, a kind of is cut-off type, as shown in Figure 1; A kind of is releasing type, as shown in Figure 2.Two kinds of spot suppressors all adopt resolution element to connect and realize, consist predominantly of positive-negative-positive triode V932, NPN type triode V902, V912, V922, diode VD934, VD901, VD911, VD921, resistance R 934, R935, R906, R916, R926 and capacitor C 934, C901, C911, C921.
Among Fig. 1, + 12V low-voltage dc power supply connects storage capacitor C934 through diode VD934, resistance R 935, the positive pole of storage capacitor C934 connects the emitter of positive-negative-positive triode V932, the base stage of described triode V932 connects described+12V low-voltage dc power supply through resistance R 934, and collector electrode links to each other with three road bleeder resistance R906, R916, R926 through three road diode VD901, VD911, VD921 respectively.Described three road bleeder resistance R906, R916, R926 link to each other with the emitter of three road NPN type triode V902, V912, V922 respectively, the base stage of triode V902, V912, V922 links to each other with R, G, B signal input part through resistance R 902, R912, R910 respectively, emitter links to each other with R, G, the B electron gun of cathode ray tube through resistance R 908, R918, R928 respectively on the one hand, links to each other with+200V high-voltage DC power supply through resistance R 907, R917, R927 respectively on the other hand.
Behind television boot-strap, to capacitor C 934 chargings, moment is full of+12V DC power supply by diode VD934, resistance R 935, and emitter and the base stage of triode V932 are in equipotential, and therefore, triode V932 ends.R, G, B input signal through resistance R 902, R912, R910 control NPN type triode V902, V912, V922 conducting, to R, G, B electron gun output control signal, normally show screen respectively.
When television set shuts down, + 12V DC power supply disappears fast, the base potential of positive-negative-positive triode V932 descends rapidly, make triode V932 be in conducting state, collector potential rises, be added to the emitter of NPN type triode V902, V912, V922 by diode VD901, VD911, VD921, and pass through bleeder resistance R906, R916, R926 discharge.At this moment,, be in cut-off state,, avoid bright spot to occur, reached the purpose of shutdown bright-spot eliminating so CRT keeps the blank screen state during shutdown because the emitter of triode V902, V912, V922 is kept high level.
Among Fig. 2, the collector electrode of positive-negative-positive triode V932 links to each other with the base stage of NPN type triode V902, V912, V922 through three tunnel described diode VD901, VD911, VD921 respectively.When television set shuts down, the very fast disappearance of+12 DC power supply, the base potential of positive-negative-positive triode V932 descends rapidly, make triode V932 be in conducting state, collector potential rises, be added to the base stage of NPN type triode V902, V912, V922 by diode VD901, VD911, VD921, make it be in the supersaturation conducting state, capacitance voltage is by bleeder resistance R906, R916, R926 discharge.At this moment, the collector potential of NPN type triode V902, V912, V922 descends rapidly, the moment flicker of whole screen large tracts of land once, the electric energy of storage is released rapidly, concentration of energy off-spot problem on one point also can not occur.
The utility model has been stopped the problem of off-spot by adopting above-mentioned simple circuit configuration, has effectively prolonged the useful life of television set, has higher actual application value.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 (10)
- One kind have the shutdown spot suppressor television set, comprise R, G, the B signal input part, shutdown spot suppressor and R, G, the B electron gun, it is characterized in that: in described shutdown spot suppressor, low-voltage dc power supply (+12V) link to each other with a storage capacitor (C934) through a forward biased diode (VD934), the positive pole of described storage capacitor (C934) connects the emitter of a positive-negative-positive triode (V932), the base stage of described positive-negative-positive triode (V932) connect described low-voltage dc power supply (+12V), collector electrode is through bleeder resistance (R906, R916, R926) ground connection; Described R, G, B signal input part connect the base stage of a NPN type triode (V902, V912, V922) separately, the collector electrode of described NPN type triode (V902, V912, V922) connects one road R, G, B electron gun respectively, and emitter links to each other with described bleeder resistance (R906, R916, R926).
- 2. the television set with shutdown spot suppressor according to claim 1, it is characterized in that: the positive pole connection low-voltage dc power supply of described diode (VD934) (+12V), negative pole links to each other with described storage capacitor (C934) through a resistance (R935), the base stage of described positive-negative-positive triode (V932) through another resistance (R934) connect described low-voltage dc power supply (+12V).
- 3. the television set with shutdown spot suppressor according to claim 1 and 2, it is characterized in that: the collector electrode of described positive-negative-positive triode (V932) links to each other with described three road bleeder resistances (R906, R916, R926) through three road diodes (VD901, VD911, VD921) respectively; Wherein, the positive pole of (VD901, VD911, the VD921) of diode connects the collector electrode of positive-negative-positive triode (V932), and negative pole connects bleeder resistance (R906, R916, R926).
- 4. the television set with shutdown spot suppressor according to claim 1 and 2, it is characterized in that: the base stage of described NPN type triode (V902, V912, V922) connects one road R, G, B signal input part through a resistance (R902, R912, R910) respectively, collector electrode on the one hand connects corresponding R, G, B electron gun through a resistance (R908, R918, R928) respectively, on the other hand respectively through another resistance (R907, R917, R927) and a high-voltage DC power supply (+200V) link to each other.
- 5. the television set with shutdown spot suppressor according to claim 4, it is characterized in that: the emitter of described NPN type triode (V902, V912, V922) is through electric capacity (C901, C911, C921) ground connection.
- One kind have the shutdown spot suppressor television set, comprise R, G, the B signal input part, shutdown spot suppressor and R, G, the B electron gun, it is characterized in that: in described shutdown spot suppressor, low-voltage dc power supply (+12V) link to each other with a storage capacitor (C934) through a forward biased diode (VD934), the positive pole of described storage capacitor (C934) connects the emitter of a positive-negative-positive triode (V932), the base stage of described positive-negative-positive triode (V932) connect described low-voltage dc power supply (+12V), collector electrode respectively with three road NPN type triode (V902, V912, V922) base stage links to each other; The base stage of described three road NPN type triodes (V902, V912, V922) connects one road R, G, B signal input part respectively, and collector electrode connects relative R, G, B electron gun, and emitter is through bleeder resistance (R906, R916, R926) ground connection.
- 7. the television set with shutdown spot suppressor according to claim 6, it is characterized in that: the positive pole connection low-voltage dc power supply of described diode (VD934) (+12V), negative pole links to each other with described storage capacitor (C934) through a resistance (R935), the base stage of described positive-negative-positive triode (V932) through another resistance (R934) connect described low-voltage dc power supply (+12V).
- 8. according to claim 6 or 7 described television sets with shutdown spot suppressor, it is characterized in that: the collector electrode of described positive-negative-positive triode (V932) links to each other with described three road bleeder resistances (R906, R916, R926) through three road diodes (VD901, VD911, VD921) respectively; Wherein, the positive pole of (VD901, VD911, the VD921) of diode connects the collector electrode of positive-negative-positive triode (V932), and negative pole connects bleeder resistance (R906, R916, R926).
- 9. according to claim 6 or 7 described television sets with shutdown spot suppressor, it is characterized in that: the base stage of described NPN type triode (V902, V912, V922) connects one road R, G, B signal input part through a resistance (R902, R912, R910) respectively, collector electrode on the one hand connects corresponding R, G, B electron gun through a resistance (R908, R918, R928) respectively, on the other hand respectively through another resistance (R907, R917, R927) and a high-voltage DC power supply (+200V) link to each other.
- 10. the television set with shutdown spot suppressor according to claim 9, it is characterized in that: the emitter of described NPN type triode (V902, V912, V922) is through electric capacity (C901, C911, C921) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200865135U CN2817254Y (en) | 2005-08-22 | 2005-08-22 | Television receiver with bright spot removing circuit at shut-down |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200865135U CN2817254Y (en) | 2005-08-22 | 2005-08-22 | Television receiver with bright spot removing circuit at shut-down |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2817254Y true CN2817254Y (en) | 2006-09-13 |
Family
ID=36997065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200865135U Expired - Fee Related CN2817254Y (en) | 2005-08-22 | 2005-08-22 | Television receiver with bright spot removing circuit at shut-down |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2817254Y (en) |
-
2005
- 2005-08-22 CN CNU2005200865135U patent/CN2817254Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |