CN2879563Y - Pincushion correction circuitry and super-thin CRT kind TV set having the same - Google Patents
Pincushion correction circuitry and super-thin CRT kind TV set having the same Download PDFInfo
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- CN2879563Y CN2879563Y CN 200620081124 CN200620081124U CN2879563Y CN 2879563 Y CN2879563 Y CN 2879563Y CN 200620081124 CN200620081124 CN 200620081124 CN 200620081124 U CN200620081124 U CN 200620081124U CN 2879563 Y CN2879563 Y CN 2879563Y
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Abstract
The utility model discloses a pincushion correction circuitry and super-thin CRT kind TV set having the same which includes a main chip, a pincushion correction tube, and a DC power, wherein, a gating control circuit, which cuts off the pincushion correction tube in line fhyback and conducts the same in line traversing, is connected between the pincushion correction signal output terminal of the main chip and the pincushion correction tube, and the gating control circuit is realized by a comparator whose positive phase input terminal receives the pincushion correction signal, and whose negative input terminal receives line fhyback pulse signal, whose output terminal is connected to the control terminal of the pincushion correction tube; The pincushion correction tube is realized by using a PNP type audion whose base is connected to the output terminal of the comparator, and whose collector is connected to earth, and whose emitter is connected to the line circuit of the TV set. The utility model skillfully employs the principle that the pincushion correction circuit can stop working in line fhyback to switch the pincushion correction tube so as to reduce the temperature rising thereof and throw out the radiator, therefore, the cost can be reduced, and the reliability and the market competitiveness of the TV set production can be effectively enhanced.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of pincushion correction circuitry that is applicable to ultra-thin CRT class television set.
Background technology
TV tech is through years of development, become very ripe product to present stage, the competition in market is also more and more cruel, particularly in today that panel TV is favored by the user more and more, for making CRT class tv product in the numerous competitor in market, obtain consumer's approval, must carry out panelized to CRT class television set, therefore, ultra-thin CRT product arises at the historic moment.For solving the nonlinear distortion question of CRT TV, all need to increase pincushion correction circuitry, ultra-thin CRT class tv product is no exception, but with respect to former common CRT class television set, the electron gun of ultra-thin CRT TV is shorter, and glass bulb is ripple more, and deflection current is bigger.Because all there is direct current biasing in common pincushion correction circuitry, if directly be applied in the ultra-thin CRT TV, can make the non-product of temperature rise of common pincushion correction circuitry high, cause fault easily, thereby reduced the reliability of tv product.If cooperate bigger radiator that it is dispelled the heat, not only increase equipment cost, and need occupy bigger space, be not suitable in the ultra-thin CRT class tv product.Therefore, how to design the needs that a effective pincushion correction circuitry satisfies ultra-thin CRT class tv product, become present television set and made one of subject matter that needs to be resolved hurrily in the industry.
Summary of the invention
The utility model is in order to overcome common pincushion correction circuitry temperature rise in the prior art, need to cooperate bigger radiator to assist realization, thereby the equipment cost height that causes, big problem takes up room, a kind of novel pincushion correction circuitry is provided, by simple circuit configuration, on the basis that does not increase cost, not only temperature rise is low to make correction tube, and saved radiator, be suitable in ultra-thin CRT class tv product, promoting the use of.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of pincushion correction circuitry and have the ultra-thin CRT class television set of described pincushion correction circuitry, comprise master chip, correction tube and DC power supply, being connected with one between the correction signal output of described master chip and correction tube ends at line retrace time control system correction tube, gate control circuit in the conducting of active line time control system correction tube, the input of described gate control circuit receives correction signal and line flyback pulse signal respectively, and its output connects the control end of correction tube; The gating end one end ground connection of described correction tube, the other end connect the row circuit.
As further qualification to technique scheme, in described gate control circuit, include a comparator, the power end of described comparator connects described DC power supply, normal phase input end connects the correction signal output of master chip, negative-phase input connects the line flyback pulse signal output part, and the output of comparator connects the control end of described correction tube.Described correction tube adopts a positive-negative-positive triode to realize, the base stage of described positive-negative-positive triode connects the output of comparator, grounded collector, and emitter connects the row circuit through coupling inductance.
As the further qualification again to technique scheme, the correction signal output of described master chip connects the normal phase input end of described comparator through a rc filter circuit; The line flyback pulse signal output part is connected the positive pole of a switching diode through a rc filter circuit and a voltage clamping circuit, and the negative pole of described switching diode connects the negative-phase input of described comparator through another rc filter circuit.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by being connected comparison circuit between the correction signal output of master chip and the correction tube, correction signal and row signal are compared, utilize cleverly pincushion correction circuitry can be when line retrace idle principle control the conducting and the cut-off state of correction tube, thereby effectively reduced the correction tube energy consumption, reduced temperature rise, saved the use of radiator, reduced cost, improved the reliability and the market competitiveness of tv product, be easy to make the extensive promotion and application of industry at television set.
Description of drawings
Fig. 1 is the schematic diagram of the utility model pincushion correction circuitry.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Common pincushion correction circuitry makes the EW correction signal of master chip output can drive correction tube work fully for guaranteeing adjusting range, must guarantee that the DC potential of correction tube is enough high.According to circuit theory, correction tube is in conducting state always when operate as normal, causes most of energy consumption on correction tube, causes the temperature rise of correction tube high especially.In order to keep rational temperature rise, correction tube must be assisted realization by the bigger radiator of mix proportion, thereby has increased circuit cost.Pincushion correction circuitry of the present utility model rationally utilizes original television signal, on the basis that does not increase cost, utilize cleverly pincushion correction circuitry can be when line retrace idle principle, by comparator correction signal EW and row signal are compared, with comparative result is the operating state that different pulse width signals is controlled correction tube, allow correction tube when operate as normal, not be in conducting state always, but between conducting and cut-off state, switch, thereby reduced the energy consumption of correction tube, reduced temperature rise, save radiator, effectively improved the reliability of tv product.The concrete annexation of described pincushion correction circuitry is referring to shown in Figure 1.
Among Fig. 1, the filter network that the correction signal EW of master chip output forms through resistance R 408 and capacitor C 404 is connected comparator N401 normal phase input end+INA ,+INB, negative-phase input-INA of described comparator N401 ,-INB is through rectification circuit connection line flyback pulse signal H-C.In described rectification circuit, line flyback pulse signal H-C connects the filter circuit of being made up of resistance R 407 and capacitor C 402 through capacitance C403, and then connect the positive pole of switching diode VD401 through the voltage clamping circuit that diode VD402, VD403 form, the negative pole of described switching diode VD401 through capacitance-resistance filter network R404, C402 connect described comparator N401 negative-phase input-INA ,-INB.DC power supply VCC provides working power for comparator N401, and output OUTA, the OUTB of comparator N401 connects the base stage of correction tube V401 through resistance R 401, and through resistance R 403 and capacitor C 405 ground connection.Described correction tube V401 is a positive-negative-positive triode, its grounded collector, and emitter is connected the capable circuit of television set through the resistance R 402 of series connection with coupling inductance LP.
Principle according to comparator, the output signal of comparator N401 is the pulse width signal that includes correction signal EW, drive correction tube V401 work with described pulse width signal, allow correction tube V401 (during the television set blank screen) remain off state when line retrace, cut down the consumption of energy, be in conducting state when active line, the correction signal EW that master chip is exported amplifies, realization is satisfied the display requirement of image to the correction of row bias current.Conducting and cut-off state when working by changing correction tube V401 reach the purpose that reduces the correction tube temperature rise, have not only simplified circuit structure, have saved the use of radiator, and have reduced cost, have improved the reliability of tv product.
The utility model has realized reducing the purpose of pincushion correction circuitry temperature rise by adopting above-mentioned simple circuit configuration, and this design philosophy has bigger directive significance to the application of other circuit from now on too with design.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)
1. pincushion correction circuitry, comprise master chip, correction tube and DC power supply, it is characterized in that: between the correction signal output of described master chip and correction tube, be connected with one and end at line retrace time control system correction tube, gate control circuit in the conducting of active line time control system correction tube, the input of described gate control circuit receives correction signal and line flyback pulse signal respectively, and its output connects the control end of correction tube; The gating end one end ground connection of described correction tube, the other end connect the row circuit.
2. pincushion correction circuitry according to claim 1, it is characterized in that: in described gate control circuit, include a comparator, the power end of described comparator connects described DC power supply, normal phase input end connects the correction signal output of master chip, negative-phase input connects the line flyback pulse signal output part, and the output of comparator connects the control end of described correction tube.
3. pincushion correction circuitry according to claim 2 is characterized in that: described correction tube adopts a positive-negative-positive triode to realize, the base stage of described positive-negative-positive triode connects the output of comparator, grounded collector, and emitter connects the row circuit through coupling inductance.
4. according to claim 2 or 3 described pincushion correction circuitries, it is characterized in that: the correction signal output of described master chip connects the normal phase input end of described comparator through a rc filter circuit; The line flyback pulse signal output part is connected the negative-phase input of described comparator with filter circuit through clamped circuit.
5. pincushion correction circuitry according to claim 4, it is characterized in that: between the negative-phase input of described line flyback pulse signal output part and comparator, be connected with a switching diode, the positive pole of described diode is connected the line flyback pulse signal output part through clamped circuit with a rc filter circuit, and negative pole connects the negative-phase input of described comparator through another rc filter circuit.
6. the ultra-thin CRT television set that has the described pincushion correction circuitry of claim 1, comprise master chip, correction tube and DC power supply, it is characterized in that: between the correction signal output of described master chip and correction tube, be connected with one and end at line retrace time control system correction tube, gate control circuit in the conducting of active line time control system correction tube, the input of described gate control circuit receives correction signal and line flyback pulse signal respectively, and its output connects the control end of correction tube; The gating end one end ground connection of described correction tube, the other end connect the row circuit.
7. television set according to claim 6, it is characterized in that: in described gate control circuit, include a comparator, the power end of described comparator connects described DC power supply, normal phase input end connects the correction signal output of master chip, negative-phase input connects the line flyback pulse signal output part, and the output of comparator connects the control end of described correction tube.
8. television set according to claim 7 is characterized in that: described correction tube adopts a positive-negative-positive triode to realize, the base stage of described positive-negative-positive triode connects the output of comparator, grounded collector, and emitter connects the row circuit through coupling inductance.
9. according to claim 7 or 8 described television sets, it is characterized in that: the correction signal output of described master chip connects the normal phase input end of described comparator through a rc filter circuit; The line flyback pulse signal output part is connected the negative-phase input of described comparator with filter circuit through clamped circuit.
10. television set according to claim 9, it is characterized in that: between the negative-phase input of described line flyback pulse signal output part and comparator, be connected with a switching diode, the positive pole of described diode is connected the line flyback pulse signal output part through clamped circuit with a rc filter circuit, and negative pole connects the negative-phase input of described comparator through another rc filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620081124 CN2879563Y (en) | 2006-02-20 | 2006-02-20 | Pincushion correction circuitry and super-thin CRT kind TV set having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620081124 CN2879563Y (en) | 2006-02-20 | 2006-02-20 | Pincushion correction circuitry and super-thin CRT kind TV set having the same |
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| Publication Number | Publication Date |
|---|---|
| CN2879563Y true CN2879563Y (en) | 2007-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620081124 Expired - Fee Related CN2879563Y (en) | 2006-02-20 | 2006-02-20 | Pincushion correction circuitry and super-thin CRT kind TV set having the same |
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| CN (1) | CN2879563Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159809B (en) * | 2007-11-07 | 2010-06-30 | 熊猫电子集团有限公司 | Method of reducing temperature rise of chip in vertical output circuit |
-
2006
- 2006-02-20 CN CN 200620081124 patent/CN2879563Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159809B (en) * | 2007-11-07 | 2010-06-30 | 熊猫电子集团有限公司 | Method of reducing temperature rise of chip in vertical output circuit |
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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: 20070314 Termination date: 20110220 |