CN85104382A - The TV deflection circuit of stabilizing raster width - Google Patents
The TV deflection circuit of stabilizing raster width Download PDFInfo
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- CN85104382A CN85104382A CN85104382.8A CN85104382A CN85104382A CN 85104382 A CN85104382 A CN 85104382A CN 85104382 A CN85104382 A CN 85104382A CN 85104382 A CN85104382 A CN 85104382A
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Abstract
One supply voltage source and a diode, an inductance, the input of a kickback transformer primary coil and a deflection circuit output stage is connected in series.Diode is added forward bias during scanning, and the inductance two ends produce a voltage, and flows through input current.The voltage that flybacks when flybacking ends diode, and constantly different what flyback, input disconnects according to input current amplitude and supply power voltage.Input current amplitude is relevant with the load current of second plate.Produce the voltage of an expression input current amplitude at the electric capacity two ends.One utmost point of capacitor and the direct voltage between the reference conductor are being controlled the deflection current in the deflecting coil, so that make the variation of second plate voltage demonstrate same variation with the direct voltage form on this electric capacity, to keep the raster width substantially constant.
Description
The present invention relates to when the accelerating voltage of television receiver changes the television scanning system of stationary raster size.
The accelerating voltage of the cathode ray tube electron beam of television receiver, perhaps second plate voltage generally is that the high-tension circuit by horizontal output transformer obtains.Each horizon light grid line width will change and change along with accelerating voltage, and promptly this width will increase along with the reduction of second plate voltage.This phenomenon is called as picture breathing.The reduction of second plate voltage may be when the display brightness highlight, because due to the increasing the weight of of the electronic beam current load of the high-tension circuit of output transformer.
The brightness of grid stroke, in the forward stroke interval of deflection cycle, also the amplitude by the voltage that is applied to the horizontal deflection coil two ends is determined.The width of grid stroke reduces along with the voltage that is applied to the coil two ends and narrows down.The increase that increases the weight of to be directed at load current of video load, this electric current is taken from the electric current of voltage regulation that high-tension circuit provides.
In order to compensate the influence of picture breathing, such as the United States Patent (USP) NO.3 that authorizes M.E.Buechel, 444, disclosed prior art in 426, be in series with resistance and load in horizontal output stage, when attention frequency signal load occurred, the voltage drop at resistance two ends increased, reduce the voltage at deflecting coil two ends, thereby reduced the width of grid stroke.Yet this control method to the grid stroke width has but increased undesirable power consumption.At the United States Patent (USP) of authorizing people such as Peer, NO 4,104, in 567 in the circuit of disclosed other prior art, detect load current by an error amplifier, silicon controlled ON time of error amplifier control changes the amplitude that the controllable silicon ON time of controlling realizes control deflection circuit driving voltage according to load current, and is constant substantially to keep raster width.
According to a kind of mode of the present invention; A deflection system comprises the deflecting coil that attaches on the deflection generator, and this deflection generator produces trace electric current and flyback electric current in deflecting coil.With the transformer that deflection generator is coupled, this transformer comprises first and second transformer coils, produces to exchange deflection efficiency voltage in coil.A second plate circuit draws load current from second transformer coil.An inductance is connected on the transformer, the voltage that these inductance two ends produce depends on load current, control the amplitude of trace electric current at an end of first transformer coil from first voltage of inductance both end voltage generation, wherein the different loads current value produces different voltages at the inductance two ends, in order to stabilizing raster width.
The variation of the electron beam current that is provided by the second plate circuit load can cause the variation of corresponding retrace interval.For example, a certain increase of electron beam current can cause the reduction of second plate voltage, and can cause the increase of retrace interval, and has correspondingly increased the width of grating, and people wish, when the size variation of electron beam current, it is constant still to keep retrace interval.Therefore, characteristics of the present invention are the variations that reduce the retrace interval that causes because of the respective electronic beam current varies.The variation that reduces retrace interval is to be connected to inductance Shu Shixian's on the deflecting coil by adjusting.Therefore, circuit of the present invention can be kept raster width and retrace interval is constant substantially.
In the drawings:
Fig. 1 represents to implement deflection circuit of the present invention;
Fig. 2 a and 2b represent the waveform in order to key-drawing 1 deflection circuit respectively;
Fig. 3 represents to implement second embodiment of deflection circuit of the present invention;
Fig. 4 represents to implement the 3rd embodiment of deflection circuit of the present invention;
In deflection circuit shown in Figure 1 200, form a direct voltage V through filtering at end 48
B, voltage V
BProvided by power supply 45, power supply 45 can be a switching type power supply.The circuit 70 of implementing one of a kind of mode of the present invention control raster width is connected to end 48 in the horizontal deflecting circuit 200 between end 50a and the end 50b, so that produce a booster tension B at input 50a
+Input 50a is connected on the horizontal deflection generator 86 of horizontal deflecting circuit 200 through with after the primary coil 53b of horizontal retrace transformer 53 and 53a connect.Should illustrate that the turn ratio of coil 53b and 53a is 15: 85, and the combined electrical sensibility reciprocal is 5MH.End 50b is connected to the primary coil 53b of retrace transformer 53 and the binding site between the 53a.
Horizontal deflection coil 81 is connected on the horizontal deflection generator 86.Generator 86 is by a linear inductance device 83 and a trace capacitor 62 of being in series with deflecting coil 81, and retrace interval capacitor device 80 and be made up of the deflection switch 87 that a horizontal output transistor 88 and damper diode 89 constitute.So that make in each horizontal deflection cycle and produce sweep current for 81 li at deflecting coil.Horizontal deflection generator 86 is connected to the end 90 of the primary coil 53a of retrace transformer 53.The level of synchronization oscillator of a routine and drive circuit 85 provide a switch controlling signal, and the base stage of controlling level output transistor 88 makes this transistor turns in level forward stroke interval, and when beginning during horizontal retrace, this transistor are turn-offed.The high-tension coil 53c of retrace transformer 53 is connected to the high-tension circuit 63 of a routine, is used for producing the second plate accelerating voltage of kinescope electron beam electric current.
Raster width control circuit 70 comprises: a series connection inductance 51 and rectifier diode 52 between end 48 and end 50b, its end 50b is the primary coil 53a of retrace transformer 53 and the tap between the 53b.Raster width control circuit 70 also comprises: being connected end 48(is the output of voltage source 45) and the electric capacity 49 of end between the 50a.
When work, deflection switch 87 is in the forward stroke interval conducting.When deflection switch 87 conductings, it makes transformer 53 and deflection circuit 86 isolate the primary current i of a rising in primary coil 53a and 53b
2, increased the energy that is stored in the retrace transformer 53 in forward stroke interval.At retrace interval, when switch 87 turn-offed, this stored energy was replenished the loss of energy of deflection circuit 86, and gives high-tension circuit 63 energizes.Deflection generator 86 constitutes a flyback resonant circuit with transformer 53.Forward stroke interval, the energy that is stored in transformer 53 and the deflecting coil 81 is passed to retrace interval capacitor device 80.At flyback voltage V of return period chien shih capacitor 80 two ends generation
R
Fig. 2 a represents primary coil 53b both end voltage V
2Waveform, voltage V
2By retrace interval t
2To t
5Flyback pulse constitute.Fig. 2 b illustrates under the low relatively condition of second plate electron beam current, the current i in the inductance 51
1aCurrent i among waveform and the transformer coil 53a
2aFirst example of waveform.Fig. 2 b also illustrates at the second plate electron beam current and is higher than under the condition of first example the current i in inductance 51
1bWaveform.With the current i that is associated among the transformer coil 53a
2aSecond example of waveform.
Suppose that inductance 51 has the null value inductance value, under this assumed condition, electric capacity 49 charges to approximate voltage V in forward stroke interval
2Level, as illustrating in Fig. 2 a example, trace voltage V
2Be approximately equal to retrace interval voltage V
2/ 8th of a peak-to-peak value.Hold 50a to have and be higher than the current potential of holding 50b, and the voltage at electric capacity 49 two ends and voltage V
BStack has produced booster tension B
+
In the deflection circuit 200 of Fig. 1, in fact inductance 51 has the inductance value of nonzero value.Therefore, the voltage at electric capacity 49 two ends works to supply with the load current of high-tension circuit 63.Simultaneously, at retrace interval, raster width control circuit 70 plays the effect of an inductance, as being described in more detail below, its value is by the load current control of high-tension circuit 63.
At retrace interval, flyback voltage V
2Polarity, make current i
1Little by little diminish, when diode 52 both end voltage polarity inversions, on the point sometime of return period, current i
1Be zero.
For example, primary current i
2Rate of change di
2/ dt is at the t of Fig. 2 b
1To t
2Forward stroke interval be by voltage B
+Control is voltage V by Fig. 1 at retrace interval
RControl.This rate of change d
I2/ dt is not subjected to the influence of high-pressure electronic beam electronic current basically.The a certain increase of the high-pressure electronic beam electronic current of circuit 63 causes current i among Fig. 1
1Corresponding increasing.Because current i
1Begin to be zero current, trace phase time started t in Fig. 2 b
1On, its rate of change di
1/ dt is the function of electron beam current.Represented as first and second examples in Fig. 2 b, dt1a/dt is lower than di in forward stroke interval
1B/dt rate of change di1/dt is at t
1To t
2Scan period is to be controlled by 51 both end voltage of the inductance among Fig. 1.Because forward stroke interval voltage V
2The phase intercommunication does not rely on electron beam current, and when the electron beam current increase caused inductance 51 both end voltage to raise, inductance 49 both end voltage had reduced.On the contrary, when electron beam current reduced, the voltage at inductance 51 two ends reduced, and electric capacity 49 both end voltage raise.
The voltage at the electric capacity 49 two ends voltage V that is added to
BOn, so that booster tension B to be provided
+When without any load and circuit loss, current i
1Be substantially zero, and electric capacity 49 charges to trace voltage V
2Work as current i
2During for high level, inductance 51 two ends produce whole trace voltage, and the voltage at electric capacity 49 two ends is zero.Therefore, booster tension B
+At voltage V
B(corresponding to the electron beam current high level) and voltage V
BAdd trace voltage V
2Change between (corresponding to the electron beam current zero level).The tap 53b of transformer 53 is moved towards end 90, will cause trace voltage V
2Increase, the voltage B of a broad is provided
+Excursion.And, as mentioned below; At retrace interval, the influence of the inductance value of 51 pairs of transformers 53 of inductance has increased.
When the second plate electric current increases, be directed at the decline of second plate voltage, voltage B
+Decline.Voltage B
+Trace current i in the control deflecting coil 81
yAmplitude.Why like this, be because produce the trace current i
yThe voltage at trace capacitor 62 two ends be approximately equal to B
+Thereby the increase of second plate electric current is directed at the increase of corresponding current i, and follows the reduction of second plate voltage, is directed at voltage B
+The corresponding reduction.As previously mentioned, voltage B
+Reduction help the stable of raster width.
At the time of Fig. 2 b t
2At the end be stored in the energy in the inductance 51 among Fig. 1 sweep time, depends on electron beam current.Therefore, diode 52 is kept a certain lasting ON time at retrace interval, and this ON time is also relevant with electron beam current; In first example of low electron beam current load, continue to the time t among Fig. 2 b
2, in second example of high electron beam current load, the time t after continuing to more
4
52 conduction periods of diode in Fig. 1, at retrace interval, inductance 51 is that the coil 53b with transformer 53 is connected in parallel, be directed at the decline of the inductance value of the primary coil 53a that is connected to end 90, the reduction of this primary inductance amount, the flyback resonance frequency is uprised, and the corresponding retrace interval that shortened.Retrace interval, diode 53 ON time are longer, and the flyback resonance frequency is higher.
Therefore, the loading of electron beam current certainly will be directed at the modulation to return period.Use such raster width control circuit 70, when electron beam current increases and during uncompensated circuit, the trend that this modulation compensated return period increases.The appearance that this return period increases be because, be coupled to the picture tube capacity load of high-tension circuit 63, increased the weight of the burden of the flyback resonant circuit of deflection circuit 86.
Useful is that the compensation of grating utilizes reactance component to obtain, rather than uses ohmic load.Therefore, corresponding energy loss is low in the circuit 200 of Fig. 1, voltage B
+With the two Passive Shape Control of circuit 70 modulation inductance, make that raster width is basic in whole electron beam current scope to keep constant.The fast response time of circuit 70 has the attendant advantages of improving fluoroscopic " leukorrhea " characteristic.
In first example of low electron beam current load: current i wherein
1=i
1a, as voltage V
BDuring for 111V, below data be the illustrative numerical value of Fig. 1 circuit: voltage V
B=118V, voltage V
R=1040V, return period t
R=11.8 μ S, peak-peak deflection current i
y=3.15A, second plate voltage=24.4KV.In second example of high electronic current load: current i=i wherein
1B, when voltage VB was 111V equally, following data were the illustrative numerical value of Fig. 1 circuit, voltage B
+=111V, voltage V
R=920V, return period t
R=12 μ S, peak-to-peak value deflection current i
y=2.9V, second plate voltage=21.7KV.
Other two kinds of embodiments of deflection circuit 200 in Fig. 3 and Fig. 4 difference key diagram 1.Identical number is represented same component or function in Fig. 1,3,4.Among Fig. 3 and Fig. 4 for Fig. 1, the raster width circuit of having revised 70 and the deflection circuit 200 of retrace transformer 53 ' or 200 " operation principle, to the deflection circuit 200 among Fig. 1 similar.For example, the deflection circuit 200 in Fig. 3 ' in, filtering capacitor 49 is connected between end 50a and the ground.Capacitor 49 among Fig. 3 should have higher voltage tolerance than the capacitor among Fig. 1 49.For example, the deflection circuit 200 in Fig. 4 ", coil 53b has replaced the inductance 51 among Fig. 1, is coupled to retrace transformer 53 by mutual inductance.The coil 53b of Fig. 4 is connected to a utmost point of capacitor 49.The capacitor 49 of Fig. 4 and coil 53b are connected to an end 50a of retrace transformer 53 primary coils together, the primary coil 53a of the transformer 53 of Fig. 4 require with Fig. 1 in the coil 53a of circuit 200 the same with the b number of turn altogether.Useful is, at the circuit 200 of Fig. 4 " in why saved inductance 51, be because utilized leakage inductance.
Claims (19)
1, deflection system with stabilizing raster width comprises:
A deflecting coil;
A deflection generator that is coupled to said deflecting coil, this generator produce a trace electric current and a flyback electric current in said deflecting coil, and determine corresponding forward stroke interval and retrace interval in each deflection cycle;
A transformer that is coupled to said deflection generator, it comprises first and second transformer coils, produces to exchange deflection efficiency voltage on coil;
One is coupled to the second plate circuit that said second transformer coil produces a second plate voltage, and this circuit draws load current from said second transformer coil;
A voltage source that is coupled to the supply of electrical energy of said transformer;
An inductance that is coupled to said transformer is characterized in that;
Be coupled to first device (49 or 52) of said transformer (53), be used for producing a voltage corresponding to said load current at the two ends of said inductance (51);
And install (52 or 49) basically by the voltage control at said inductance two ends, be used for going up first voltage of generation at the end (50a) of said first transformer coil (53b), the said trace sweep current of this voltage control, the different values of said load current wherein, produce the voltage of different values at the two ends of inductance (51), so that stabilizing raster width.
2, according to a deflection system that claim 1 limited, said first device in the claim 1, comprise a rectifier (52) that is connected to said transformer (53), under the control of this rectifier by said inductance (51) both end voltage, with the first polar voltages rectification of a said deflection efficiency voltage, the variation that produces said trace voltage.
3, according to the deflection system that claim 2 limited, said rectifier is made up of a diode (52) in the claim 2.
4, according to a deflection system that claim 2 limited.First polar voltages of the deflection in the claim 2 in the said deflection transformer (53) is a forward bias to said rectifier (52), in said inductance (51), produce an input current, this input current can replenish the energy loss of said deflection circle (81), and second polarity of the deflection efficiency voltage in said deflection transformer can reduce said input current, is enough to make said rectifier (52) to transfer to and ends.
5, according to the deflection system that claim 4 limited, by forward bias, this forward bias duration changes with said load current said rectifier (52) in a time interval of flyback in the claim 4.
6, according to a deflection system that claim 1 limited, said first device for generating voltage is made up of one first capacitor (49) in the claim 1, this capacitor is coupled to an end (50a) of said first transformer coil (53b), and this device produces a direct voltage.
7, according to a deflection system that claim 6 limited, said first capacitor (49) coupling of connecting with said supply voltage source (45) in the claim 6, produce said first voltage, this voltage is the voltage at said capacitor (49) two ends and the voltage (V of said supply voltage source (45)
B) sum.
8, according to a deflection system that claim 1 limited, said deflection generator (86) is made up of a trace capacitor (62) in the claim 1, this capacitor is supplied with said trace sweep current, and being coupled to of said trace capacitor (62), extremely goes up said first voltage, in order to control the voltage at said trace capacitor (62) two ends.
9, a deflection system that is limited according to Claim 8, the said first voltage (B in the claim 8
+) be coupled to the said electrode of said trace capacitor (62), said trace capacitor is charged to basically the voltage of said first voltage.
10, according to a deflection system that claim 1 limited, said deflection generator (86), inductance (51) and deflecting coil (81) form a flyback resonant circuit at retrace interval in the claim 1, the three is connected to each other by certain mode, the variation of the retrace interval that causes with the variation that reduces owing to said load current.
11, according to a deflection system that claim 10 limited, in the claim 10 said first device comprise a said rectifier of rectifier (52) that is connected to said inductance (51) in the time interval in flyback be apply forward biased, the variation of its forward bias time along with said load current changes, said rectifier (52) is coupled on the said inductance (51), wherein said flyback resonant circuit in some sense, when said load variations, can stablize the resonance frequency of flyback resonant circuit.
12, according to a deflection system that claim 11 limited, said inductance (51) is when said rectifier (52) when applying forward bias in the claim 11, tend to improve the resonance frequency of said flyback resonant circuit (86,51,81), and, can reduce the flyback resonance frequency when said rectifier (52) when applying reverse bias.
13, according to a deflection system that claim 1 limited, said first transformer coil (53a, 53b) in the claim 1, comprise a centre tap (50b) with electric current through said inductance (51), be coupled to said deflection generator (86).
14, according to the deflection system that claim 1 limited, said inductance (53b) is that magnetic couple is incorporated into said deflection transformer (Fig. 4) in the claim 1.
15, according to the deflection system that claim 1 limited, said inductance (53b) in the claim 1 is included in (Fig. 4) among said first transformer coil.
16, according to the deflection system that claim 15 limited, said inductance (53b) in the claim 15 is connected the end (52) of said first transformer coil (53a), and between the centre tap (50a).
17, according to a deflection system that claim 16 limited, the generation device of said first voltage is made up of a capacitor (49) in the claim 16, this capacitor is connected said centre tap (50a), and common conductor () between, in order between the common conductor of said centre tap and said deflection system, to produce said first voltage.
18, according to a deflection system that claim 1 limited, the amplitude of first polarity of said deflection efficiency voltage has determined the excursion of said trace sweep current in the claim 1, and this trace sweep current can be produced by the generation device (49 or 51) of said first voltage.
19, deflection system that flyback is stable comprises:
A deflecting coil;
A deflection generator that is coupled to said deflecting coil, be used for producing a trace scanning and a retrace scanning electric current at said deflecting coil, this deflection generator defines corresponding trace and retrace interval in each deflection cycle, said deflection generator comprises a retrace interval capacitor device and a trace capacitor, the former and said deflecting coil are formed a flyback resonant circuit, and the latter and said deflecting coil are formed a trace resonant circuit;
Transformer and the coupling mutually of said deflection generator, and comprise first and second transformer coils, in above-mentioned transformer coil, produce and exchange deflection efficiency voltage;
One with the said transformer supply voltage source of coupling mutually.
A shift arrives the load circuit of said second transformer coil, and in order to produce a load voltage, this load circuit draws load current from said second transformer coil; It is characterized in that:
At said retrace interval, inductance (51) is coupled to said flyback resonant circuit (80,62,83,81), and said inductance is incorporated into said trace capacitor (62) by galvanic couple;
For at said retrace interval, said inductance (51) is coupled to said flyback resonant circuit, said diode produces an input current relevant with said load current on said inductance, when said deflection efficiency voltage changes polarity is first polarity chron, said herein rectifier becomes forward bias, make said input current conducting, second polarity of the deflection efficiency voltage in the said herein deflection transformer (53) makes said input current in a period of time interval of flyback, being reduced to is enough to make said diode (52) to change into to end, to such an extent as to when said load current changes, make the flyback resonance frequency of said flyback resonant circuit, change according to the interval of a period of time in the said flyback, in order to stablize retrace interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104382.8A CN1005131B (en) | 1985-06-07 | 1985-06-07 | Tv deflection circuit for stabilizing raster width |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104382.8A CN1005131B (en) | 1985-06-07 | 1985-06-07 | Tv deflection circuit for stabilizing raster width |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104382A true CN85104382A (en) | 1986-12-03 |
| CN1005131B CN1005131B (en) | 1989-09-06 |
Family
ID=4793807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104382.8A Expired CN1005131B (en) | 1985-06-07 | 1985-06-07 | Tv deflection circuit for stabilizing raster width |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1005131B (en) |
-
1985
- 1985-06-07 CN CN85104382.8A patent/CN1005131B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1005131B (en) | 1989-09-06 |
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