CN2669521Y - High-voltage automatic control circuit - Google Patents
High-voltage automatic control circuit Download PDFInfo
- Publication number
- CN2669521Y CN2669521Y CNU2003201151538U CN200320115153U CN2669521Y CN 2669521 Y CN2669521 Y CN 2669521Y CN U2003201151538 U CNU2003201151538 U CN U2003201151538U CN 200320115153 U CN200320115153 U CN 200320115153U CN 2669521 Y CN2669521 Y CN 2669521Y
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- CN
- China
- Prior art keywords
- control circuit
- automatic control
- voltage
- switch transformer
- high pressure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a high-voltage automatic control circuit, comprising a switch transformer and a high-voltage package. This high-voltage automatic control circuit is characterized in that this high-voltage automatic control circuit also comprises an antijamming circuit, which is connected between the switch transformer and the high-voltage package, the switch transformer, the antijamming circuit and the high-voltage package are connected in series, and the antijamming circuit is used for isolating the influence caused by the high-voltage beam current outputted by the high-voltage package to the switch transformer. Because the solution is adopted, the variance of the switch transformer B + influenced by the loading variance of the FBT (high-voltage package) is obstructed, the current abrupt variance is limited, the twist problem of the top right corner of P card can be solved effectively, the core cost can be reduced greatly, and more economic benefits can be created.
Description
Technical field:
The utility model relates to a kind of high pressure automatic control circuit, especially relates to a kind of high pressure automatic control circuit that is applied to color television set.
Background technology:
Because there are various linear distortion problems in picture tube and movement when cooperating, solve this type of problem under the prerequisite of controlling cost is a difficult problem that perplexs the Electronics Engineer always in color television set.
The color television set electronic scanning is regardless of being interlacing scan or lining by line scan; Its line scanning electron beam all is to move horizontally from left to right, and color television set is linear normal when watching the grid signal; But color television set is when receiving the Philips picture signal, about the big 0.8mA of high pressure beam electronic current of the part on the high pressure ratio of gun currents next door of the image white part in the upper right corner, also just promoted whole electric current in the ranks of this moment, and EHT (high pressure automatic control circuit) circuit of movement can't be regulated at this moment, make it big, on chromoscope, will demonstrate the phenomenon of P card upper right corner distortion at this capable constantly amplitude variation.This type of problem has more present use movement or cheaply on the chromoscope, this phenomenon directly has influence on the color television picture quality cheaply.
Summary of the invention:
The purpose of this utility model is exactly in order to solve above P card upper right corner distortion problem, and a kind of high pressure automatic control circuit is provided.
For achieving the above object, the utility model proposes a kind of high pressure automatic control circuit, comprise switch transformer and high voltage package, it is characterized in that: also comprise anti-jamming circuit, be connected between switch transformer and the high voltage package, be used for of the influence of the high pressure beam electronic current of isolated high-voltage bag output switch transformer.
Owing to adopted above scheme, obstruct influences the variation of switch transformer B+ because of the variation of FBT (high voltage package) load, places restrictions on the sudden change of electric current, can effectively solve the problem that the P card upper right corner is turned round, can reduce the movement cost greatly, create higher economic benefit.
Description of drawings:
Fig. 1 is the frame diagram of high pressure automatic control circuit.
Fig. 2 is the concrete application circuit of high pressure automatic control circuit.
Embodiment:
Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.
The high pressure automatic control circuit comprises switch transformer, high voltage package and anti-jamming circuit as shown in Figure 1, and its anti-jamming circuit is connected between switch transformer and the high voltage package, is used for the influence of the high pressure beam electronic current of isolated high-voltage bag output to switch transformer.
Embodiment as shown in Figure 2, the high pressure automatic control circuit comprises switch transformer T603, FBT (high voltage package) and resistance R 336, resistance R 336 is connected between switch transformer T603 and the FBT, is used to isolate the influence of the high pressure beam electronic current of FBT output to switch transformer T603.Provide a B+ (principal voltage) voltage (generally at 100V-150V) by switch transformer T603, this voltage is given FBT (high voltage package) power supply of back again, when chromoscope line scanning electron beam output high pressure beam electronic current when scanning white is very big, can reach 1.8mA; Output high pressure beam electronic current becomes in zero when deceiving the field and scan, electric current alters a great deal, thereby have influence on the B+ output of the switch transformer of previous stage, switch transformer B+ voltage output just is subjected to back one-level load variations and changes, place restrictions on the sudden change of electric current if output between the FBT variation that resistance R of series connection 336 intercepts variation because of the FBT load and influence switch transformer B+ at switch transformer B+, can effectively solve the problem that the P card upper right corner is turned round, but this resistance can not be excessive, otherwise can cause B+ seriously to descend, the phenomenon that can occur not starting shooting; If the too small meeting of this resistance does not improve having, because the current ratio in B+ loop is bigger, change in resistance little by little all can have pressure drop clearly to be assigned on this resistance R 336, so the resistance and the rated power of selected resistance must choose, can calculate according to following formula:
R＝U/I P＝U*I
Generally about 1.5V, the worker need decide according to your designed movement the U value.
The cement resistor that is chosen for 4 Ω 5W through the R336 in calculating and the Test Drawing 1 is a preferred plan.When this scheme was joined the 29 cun 73SX707Y22-DC01 of Yongxin chromoscopes at the 4P36 of Skyworth movement, the cement resistor that R336 is chosen for 4 Ω 5W can effectively solve the problem of P card upper right corner distortion.
Advantage of the present utility model:
Advantage of the present utility model is only can solve with a resistance problem of P card upper right corner distortion, can reduce the movement cost greatly, creates higher economic benefit.
The utility model has been lifted a most preferred embodiment, but all do to such an extent that conspicuous improvement should be included within the protection range of the present utility model on basis of the present utility model.
Claims (5)
1, a kind of high pressure automatic control circuit comprises switch transformer and high voltage package, it is characterized in that: also comprise anti-jamming circuit, be connected between switch transformer and the high voltage package, be used for the influence of the high pressure beam electronic current of isolated high-voltage bag output to switch transformer.
2, a kind of high pressure automatic control circuit as claimed in claim 1, it is characterized in that: described anti-jamming circuit is a current-limiting circuit.
3, a kind of high pressure automatic control circuit as claimed in claim 2, it is characterized in that: described current-limiting circuit is a current-limiting resistance.
4, a kind of high pressure automatic control circuit as claimed in claim 3, it is characterized in that: the resistance of described current-limiting resistance and rated power calculate according to following formula:
R＝U/I P＝U×I
Wherein, U is about 1.5V, and I decides according to the Core of TV set at high-voltage control circuit place.
5, a kind of high pressure automatic control circuit as claimed in claim 4, it is characterized in that: described current-limiting resistance is the cement resistor of 4 Ω 5W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201151538U CN2669521Y (en) | 2003-11-24 | 2003-11-24 | High-voltage automatic control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201151538U CN2669521Y (en) | 2003-11-24 | 2003-11-24 | High-voltage automatic control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2669521Y true CN2669521Y (en) | 2005-01-05 |
Family
ID=34438924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201151538U Expired - Fee Related CN2669521Y (en) | 2003-11-24 | 2003-11-24 | High-voltage automatic control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2669521Y (en) |
-
2003
- 2003-11-24 CN CNU2003201151538U patent/CN2669521Y/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050105 Termination date: 20101124 |