CN1306792C - A multi-frequency line S-correction circuit - Google Patents
A multi-frequency line S-correction circuit Download PDFInfo
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- CN1306792C CN1306792C CNB2004100260946A CN200410026094A CN1306792C CN 1306792 C CN1306792 C CN 1306792C CN B2004100260946 A CNB2004100260946 A CN B2004100260946A CN 200410026094 A CN200410026094 A CN 200410026094A CN 1306792 C CN1306792 C CN 1306792C
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Abstract
The present invention relates to a multifrequency line S correction circuit for a display and a multifrequency colour television, which comprises a drive circuit 2, a switch tube 3, a power supply 4 and a capacitor 5, wherein the switch tube 3 and the capacitor 5 are connected in series; the drive circuit 2 and the switch tube 3 are connected; the power supply 4 and the drive circuit 2 are connected; the drive circuit 2 externally connected with a pulse-width modulation circuit 1 for making the capacitor 5 continuously adjusted; the switch tube 3 and the capacitor 5 form a variable capacitor. The present invention solves the technical problems of poor scanning linearity of the S correction circuit, complex circuits, high cost and low reliability existing in the background art.
Description
One, technical field
The present invention relates to a kind of multifrequency row S correcting circuit that is used for display and multifrequency colour TV.
Two, background technology
In display and multifrequency colour TV, because under different line frequencies, the S correcting value difference of line scanning is very big, circuit in the past is: with a plurality of electric capacity respectively and switching tube (being generally 2～3) series connection, each switching tube all has a cover drive circuit, there is one group of control signal (level) to come the conducting of control switch pipe or end, thereby when different line frequencies, obtains different S correcting values.But sort circuit can only obtain one group of discrete S correcting value, for example: can obtain correct S correcting value when line frequency is 31KHz, 38KHz, 48KHz, and line frequency just can not obtain correct S correcting value when 30KHZ, 35KHz, 45KHz, from picture, line linearity will be weaker under these line frequencies.Simultaneously, owing to will adopt a plurality of electric capacity and a plurality of switching tube and line frequency Detection ﹠ Controling circuit, circuit complexity, cost height, reliability are low.
Three, summary of the invention
The invention solves that the S correcting circuit scanning linearity that exists in the background technology is poor, circuit complexity, cost height, technical problem that reliability is low.
Technical solution of the present invention is: the present invention is a kind of multifrequency row S correcting circuit, it comprises drive circuit 2, switching tube 3, power supply 4 and electric capacity 5, switching tube 3 and electric capacity 5 serial connections, drive circuit 2 joins with switching tube 3, power supply 4 joins with drive circuit 2, and its special character is: described drive circuit 2 is circumscribed with and can makes electric capacity 5 continuously adjustable pulse-width modulation circuits 1, and switching tube 3 and electric capacity 5 are formed variable capacitance, this variable capacitance one end is tie point A, and the other end is tie point B.
Above-mentioned pulse-width modulation circuit 1 comprises resistance R 1, R2 and R4, coupling capacitance C2, triode Q1, resistance R 1, R2 are serially connected with between tie point A and the tie point B, the contact of resistance R 1 and R2 is connected to the base stage of triode Q1 by coupling capacitance C2, resistance R 4 is connected between the collector electrode and power supply 4 of triode Q1, and the collector electrode of triode Q1 is connected to drive circuit 2, and the emitter of triode Q1 is connected to tie point B.
Above-mentioned resistance R 3 and capacitor C 1 series connection back and described resistance R 1 are in parallel.
Above-mentioned coupling capacitance C2 loong shunt has voltage stabilizing didoe VD1.
The contact of above-mentioned resistance R 1 and R2 is provided with a potentiometer RP1, and the centre tap of potentiometer RP1 is connected to the base stage of triode Q1 by coupling capacitance C2.
Above-mentioned pulse-width modulation circuit 1 comprises resistance R 1～R7, potentiometer RP1, triode Q1, Q2, resistance R 1 is connected to the base stage of triode Q1, resistance R 2, R3 is a triode Q1 base biasing resistor, be connected to triode Q1 base stage and power supply 4 respectively, between triode Q1 base stage and the ground, resistance R 4 is connected between triode Q1 collector electrode and the power supply 4, described resistance R 5 is connected between the emitter and ground of triode Q1, be serially connected with resistance R 6 and potentiometer RP1 between the collector electrode of triode Q1 and the ground, contact between described resistance R 6 and potentiometer RP1 is connected to the base stage of triode Q2, resistance R 7 is connected between the collector electrode and power supply 4 of triode Q2, the collector electrode of triode Q2 is connected to drive circuit 2, described power supply 4 comprises+B-source and+the 12V power supply, + B-source is connected to the contact of resistance R 2 and R4, and+12V power supply is connected to resistance R 7.
Above-mentioned switching tube 3 and electric capacity 5 are one group.
The variable capacitance that above-mentioned switching tube 3 and electric capacity 5 are formed is parallel with capacitor C
S
The present invention adopts an electric capacity and switching tube replacement a plurality of switching C in the past
SThe S correcting circuit, realize that capacitor's capacity changes to adapt to different S correcting values continuously under different line frequencies.In the present invention, it is modulation signal line frequency, EDM Generator of Adjustable Duty Ratio that pulse-width modulation circuit produces a pulse frequency, and through drive circuit control switch pipe, switching tube is conducting in the inner branch time of the line-scanning period, ON time is different and different with line frequency, thereby changes the S correcting value.Therefore the present invention has simplified circuit greatly, has reduced cost, has improved reliability.Simultaneously because the present invention can follow the tracks of line frequency continuously, it is only relevant with line scanning power supply+B to adjust back S correcting value, and line scanning power supply+B and line frequency are one to one, no matter therefore how many line frequencies is, all there is unique pulse duration corresponding with it, that is unique S correcting value is corresponding with it, thereby the line linearity aspect of picture is greatly enhanced.
Four, description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the structural representation of pulse-width modulation circuit embodiment one of the present invention;
Fig. 3 is the structural representation of pulse-width modulation circuit embodiment two of the present invention;
Fig. 4 is the structural representation of the embodiment of the invention one;
Fig. 5 is the structural representation of the embodiment of the invention two.
Five, embodiment
Referring to Fig. 1, the present invention includes drive circuit 2, switching tube 3, power supply 4 and electric capacity 5, switching tube 3 and electric capacity 5 serial connections, drive circuit 2 joins with switching tube 3, and power supply 4 joins with drive circuit 2, and drive circuit 2 is circumscribed with and can makes electric capacity 5 continuously adjustable pulse-width modulation circuits 1, switching tube 3 and electric capacity 5 are formed variable capacitance, this variable capacitance one end is tie point A, and the other end is tie point B, and variable capacitance of the present invention can directly be parallel to row S corrective capacity C in the conventional display circuit in use
STwo ends, line linearity coil and original capable S corrective capacity C
SContact be connected to tie point A; The other end of original capable S corrective capacity is connected to tie point B, by changing electric capacity 5 and C
SSummation play the effect that changes the S correcting value, under the deflecting coil parameter condition of some picture tube, C
SCan save, be about to this circuit and directly insert the S correcting value that just can satisfy line scanning in the scanning circuit.The present invention can directly be applied in existing a plurality of electric capacity respectively with the S correcting circuit of switching tube series connection, also can directly switching tube 3 and electric capacity 5 be set to one group, be good with one group.
Referring to Fig. 2, pulse-width modulation circuit 1 of the present invention comprises resistance R 1, R2 and R4, coupling capacitance C2, triode Q1, described resistance R 1, R2 is serially connected with between tie point A and the tie point B, the contact of resistance R 1 and R2 is connected to the base stage of triode Q1 by coupling capacitance C2, the contact of resistance R 1 and R2 also can be provided with a potentiometer RP1, the centre tap of potentiometer RP1 is connected to the base stage of triode Q1 by coupling capacitance C2, resistance R 4 is connected between the collector electrode and power supply 4 of triode Q1, the collector electrode of triode Q1 is connected to drive circuit 2, the emitter of triode Q1 is connected to tie point B, resistance R 3 and capacitor C 1 series connection back are in parallel with resistance R 1, and the capable parabolic shape waveform of sampling can not deformed; Coupling capacitance C2 also can be parallel with voltage stabilizing didoe VD1 outward, can protect coupling capacitance C2 like this.
Referring to Fig. 3, pulse-width modulation circuit 1 of the present invention comprises resistance R 1～R7, potentiometer RP1, triode Q1, Q2, resistance R 1 is connected to the base stage of triode Q1, resistance R 2, R3 is a triode Q1 base biasing resistor, be connected to triode Q1 base stage and power supply 4 respectively, between triode Q1 base stage and the ground, resistance R 4 is connected between triode Q1 collector electrode and the power supply 4, resistance R 5 is connected between the emitter and ground of triode Q1, be serially connected with resistance R 6 and potentiometer RP1 between the collector electrode of triode Q1 and the ground, contact between resistance R 6 and potentiometer RP1 is connected to the base stage of triode Q2, resistance R 7 is connected between the collector electrode and power supply 4 of triode Q2, and the collector electrode of triode Q2 is connected to drive circuit 2.Power supply 4 comprises+B-source and+the 12V power supply ,+B-source is connected to the contact of resistance R 2 and R4 ,+12V power supply is connected to resistance R 7.
Referring to Fig. 4, be described below with the circuit structure of pulse-width modulation circuit embodiment one and the multifrequency row S correcting circuit of existing circuit structure formation:
Capable parabolic shape in the line scanning loop is through the dividing potential drop of resistance R 1, R2, add to the base stage of triode Q1 again through coupling capacitance C2, cutting through triode Q1, output pulse signal on its collector electrode, add on the grid of Q4 after the driving of this pulse signal through triode Q2 and Q3, the ON time of control Q4, thereby control capacitance C
S' capacity, reach capacitor C
S' adjustable continuously.Capable parabolic shape in the line scanning loop passes through the rectification of diode VD2 simultaneously, the filtering of the voltage stabilizing of voltage stabilizing didoe VD3 and capacitor C 3, and the power supply of formation 12V is supplied with drive circuit.
Referring to Fig. 5, be described below with the circuit structure of pulse-width modulation circuit embodiment two and the multifrequency row S correcting circuit of existing circuit structure formation:
During this circuit working, add to the base stage of triode Q1 from capacitor C 1 and resistance R 1 from the capable parabolic shape of 32 pin of TDA4841 output, the amplitude that is amplified to is+B, pass through the dividing potential drop of resistance R 6 and potentiometer RP1 then, add to the base stage of triode Q2, cutting formation amplitude through triode Q2 is+pulse signal of 12V, the width of this pulse signal changes with the variation of+B, this pulse signal is through the ON time of coupling capacitance C2 control triode Q3 then, thereby the capacity of control variable capacitance, reach the adjustable continuously of variable capacitance, regulator potentiometer RP1 can regulate the capacity of variable capacitance.
Claims (9)
1, a kind of multifrequency row S correcting circuit, comprise drive circuit (2), switching tube (3), power supply (4) and electric capacity (5), described switching tube (3) and electric capacity (5) serial connection, drive circuit (2) joins with switching tube (3), described power supply (4) joins with drive circuit (2), it is characterized in that: described drive circuit (2) is circumscribed with and can makes the continuously adjustable pulse-width modulation circuit of electric capacity (5) (1), described switching tube (3) and electric capacity (5) are formed variable capacitance, this variable capacitance one end is tie point A, and the other end is tie point B.
2, multifrequency row S correcting circuit according to claim 1, it is characterized in that: described pulse-width modulation circuit (1) comprises resistance R 1, R2 and R4, coupling capacitance C2, triode Q1, described resistance R 1, R2 are serially connected with between tie point A and the tie point B, the contact of described resistance R 1 and R2 is connected to the base stage of triode Q1 by coupling capacitance C2, described resistance R 4 is connected between the collector electrode and power supply (4) of triode Q1, the collector electrode of described triode Q1 is connected to drive circuit (2), and the emitter of described triode Q1 is connected to tie point B.
3, multifrequency row S correcting circuit according to claim 2 is characterized in that: described resistance R 3 and capacitor C 1 series connection back and described resistance R 1 are in parallel.
4, multifrequency row S correcting circuit according to claim 3, it is characterized in that: described coupling capacitance C2 loong shunt has voltage stabilizing didoe VD1.
5, according to claim 2 or 3 or 4 described multifrequency row S correcting circuits, it is characterized in that: the contact of described resistance R 1 and R2 is provided with a potentiometer RP1, and the centre tap of described potentiometer RP1 is connected to the base stage of triode Q1 by coupling capacitance C2.
6, multifrequency row S correcting circuit according to claim 1, it is characterized in that: described pulse-width modulation circuit (1) comprises resistance R 1～R7, potentiometer RP1, triode Q1, Q2, described resistance R 1 is connected to the base stage of triode Q1, described resistance R 2, R3 is a triode Q1 base biasing resistor, be connected to triode Q1 base stage and power supply (4) respectively, between triode Q1 base stage and the ground, described resistance R 4 is connected between triode Q1 collector electrode and the power supply (4), described resistance R 5 is connected between the emitter and ground of triode Q1, be serially connected with resistance R 6 and potentiometer RP1 between the collector electrode of triode Q1 and the ground, contact between described resistance R 6 and potentiometer RP1 is connected to the base stage of triode Q2, resistance R 7 is connected between the collector electrode and power supply (4) of triode Q2, and the collector electrode of triode Q2 is connected to drive circuit (2).
7, multifrequency row S correcting circuit according to claim 6 is characterized in that: described power supply (4) comprises+B-source and+the 12V power supply, described+B-source is connected to the contact of resistance R 2 and R4, described+12V power supply is connected to resistance R 7.
8, according to claim 1 or 2 or 6 described multifrequency row S correcting circuits, it is characterized in that: described switching tube (3) and electric capacity (5) are one.
9, multifrequency row S correcting circuit according to claim 8 is characterized in that: the variable capacitance that described switching tube (3) and electric capacity (5) are formed is parallel with capacitor C
S
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100260946A CN1306792C (en) | 2004-04-30 | 2004-04-30 | A multi-frequency line S-correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100260946A CN1306792C (en) | 2004-04-30 | 2004-04-30 | A multi-frequency line S-correction circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1571470A CN1571470A (en) | 2005-01-26 |
| CN1306792C true CN1306792C (en) | 2007-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100260946A Expired - Fee Related CN1306792C (en) | 2004-04-30 | 2004-04-30 | A multi-frequency line S-correction circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05153423A (en) * | 1991-11-29 | 1993-06-18 | Matsushita Electric Ind Co Ltd | Horizontal deflection circuit |
| CN1110452A (en) * | 1993-09-03 | 1995-10-18 | 汤姆森消费电子有限公司 | Vertical deflection with vertical shrink mode |
| CN1213247A (en) * | 1997-08-18 | 1999-04-07 | 索尼公司 | Horizontal deflection current |
-
2004
- 2004-04-30 CN CNB2004100260946A patent/CN1306792C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05153423A (en) * | 1991-11-29 | 1993-06-18 | Matsushita Electric Ind Co Ltd | Horizontal deflection circuit |
| CN1110452A (en) * | 1993-09-03 | 1995-10-18 | 汤姆森消费电子有限公司 | Vertical deflection with vertical shrink mode |
| CN1213247A (en) * | 1997-08-18 | 1999-04-07 | 索尼公司 | Horizontal deflection current |
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| Publication number | Publication date |
|---|---|
| CN1571470A (en) | 2005-01-26 |
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Granted publication date: 20070321 Termination date: 20130430 |