CN1067999A - The linearisation of vertical reference ramp - Google Patents
The linearisation of vertical reference ramp Download PDFInfo
- Publication number
- CN1067999A CN1067999A CN92105202A CN92105202A CN1067999A CN 1067999 A CN1067999 A CN 1067999A CN 92105202 A CN92105202 A CN 92105202A CN 92105202 A CN92105202 A CN 92105202A CN 1067999 A CN1067999 A CN 1067999A
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- Prior art keywords
- amplifier
- coupled
- voltage
- current
- capacitor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/90—Linearisation of ramp; Synchronisation of pulses
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
- H03K4/69—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier
- H03K4/72—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier combined with means for generating the driving pulses
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
A kind of linearizer of vertical reference ramp.Vertical deflection ramp voltage (VR) is produced by discharging and recharging of resistance (R8) by electric capacity (C1).This voltage (VR) is connected to amplifier (32,34,42), with the electric current (IY) of driving by deflecting coil (Y1), thereby produces magnetic deflection field.For eliminating the vertical linearity error in the deflection beam, be necessary to make the voltage VR linearisation that is intrinsic index shape.This purpose is by a plurality of feedback loops the sampled voltage (VS) of amplifier output voltage (VY) and deflection current (IY) to be linked slope formation resistance (R8) to reach.
Description
The present invention relates to produce the deflection circuit of the linearizing reference ramp defection signal that is used to drive frame deflector coil.
Vertical ratio reference ramp can produce by in vertical scanning period current source being coupled to a capacitor.When this current source charges to this electric capacity, just produce a slope or sawtooth voltage.Vertical sync pulse is determined the initial of vertical flyback and is used for the discharge of capacitor voltage that two ends produce.At the end of vertical sync pulse, current source restarts the capacitor charging, to produce and the synchronous repetition sawtooth waveform of described vertical sync pulse.
Vertical ratio reference ramp also can produce by in vertical flyback interim one voltage source being coupled to capacitor.Voltage source makes this electric capacity charge to the maximum voltage of reference ramp, then in vertical scanning period, with capacitor with the voltage source decoupling merge make capacitor can a conductive discharge.The voltage at capacitor two ends reduces, thereby defines a slope.This process repeats with vertical scanning frequency, and synchronous with vertical sync pulse.
The slope of this repetition or title sawtooth waveforms reference signal are coupled to vertical output amplifier, with the excitation frame deflector coil.The magnetic field that has produced sawtooth current and produce therefrom in frame deflector coil makes electron beam at the cathode ray tube intrinsic deflection.
The reference ramp that is produced by conductive discharge by capacitor is not linear.The voltage at capacitor two ends is exponential damping according to corresponding RC discharge time constant, that is to say that the slope of this voltage waveform is slow down gradually in time (reducing angle).Although for weakening this nonlinear effect of reference ramp, can adjust all parameters of deflection circuit, be unfavorable but reference ramp this is exponential smooth section, non-linear because it can make shown image produce in vertical direction.
Reference ramp signal from ramp generator is coupled to a vertical output amplifier by a differential amplifier.One can be connected in series with the output of deflecting coil and vertical output stage every the DC capacitor, to produce an AC deflection current in this winding.This vertical output amplifier is a voltage to current converter basically.The reference ramp signal is coupled to an input of differential amplifier.Feedback network is with two inputs of the output coupled differential amplifier of output amplifier, so that set the gain of output drive level and output signal is carried out shaping.One DC negative feedback path has been determined the DC level of output, and the control of output level is provided from the AC negative-feedback signal that the current sampling resistor both end voltage of connecting with deflecting coil is obtained.
The output voltage of output amplifier has the component of a ramp voltage and a parabolic shape voltage.Its ramp component is by flowing through described coil resistance and being produced with deflection current on the current sampling resistor that is connected in series.The parabolic shape component then produces by the integration of blocking capacitor to deflection current.
For producing S shape deflection current, output voltage is carried out integration, be the quadratic integral that forms three grades of correction signals thereby cause this parabolic shape component.Output voltage behind the integration is added to the positive input of the differential amplifier that is used to encourage output amplifier, so that produce S shape deflection current.
The slope that the reference slope generator that utilizes resistance that one slope generation capacitor is filled or discharge no doubt must produce index shape, however the application feedback of the present patent application but can produce linear slope.
In a deflection circuit, resistance and capacitor ramp generator are coupled to an amplifying device, and a deflecting coil is linked in its output again, to produce deflection current.The same current sensor of this deflecting coil is the interchange series coupled, and this transducer produces the signal that is directly proportional with coil current.Come the feedback signal of self-deflection output to be coupled to described resistance, so that linearisation is carried out on the intrinsic index slope that is produced by the resistance capacitance combination.
In another embodiment of the present invention, be provided with two feedback loops, article one is taken from amplifier out, and second is taken from the yoke current transducer.
The second feedback network connects the cursor slide from a potentiometer that is connected in parallel with the deflection current sensing resistor.
This second feedback signal also is coupled to amplifier, to produce the variable negative feedback control to the deflection current amplitude under the situation that Height Adjustment is provided at potentiometer.
Fig. 1 is the expression schematic diagram that has a vertical deflection circuit of linearisation ramp generator of the present invention.
Fig. 2 to 5 shows the waveform of difference among Fig. 1.
In the vertical deflection circuit of Fig. 1, the VSYNC pulse that is produced by sync separator (representing among the figure) is added to switch 22.Switch 22 makes capacitor C1 charge to positive peak voltage VR by constant voltage source 20 by the action of VSYNC signal excitation.In scan period, capacitor discharges in a kind of (treat into one describe) mode, to produce the downward-sloping ramp portion of signal VR.
Ramp signal VR is coupled to a reverse input end of differential amplifier 34 by a forward buffer 32.The positive input of amplifier 34 is coupled to and will goes through certain feedback path in the back.Voltage source 20, switching device 22, it is M52043SP that buffer 32 and differential amplifier 34 can be such as model, M51407SP, or the element of the monolithic integrated circuit of M51408SP and so on, the respective lead of these elements number is shown among Fig. 1.
The output signal excitation frame deflector coil Y1 of amplifier 42, and same blocking capacitor C3 of coil Y1 and a current sense resistance R 4 series coupled.Fig. 2 depicts the voltage VS that current sense resistance R 4 two ends produce by the deflection current IY among the deflecting coil Y1.Show quick retrace period by rise to a positive peak form fast from a negative peak.Fig. 5 represents the voltage VY of amplifier 42 outputs.Voltage VY shows the positive pulse that flyback occurs constantly, and this pulse has realized the snap back to yoke current.Voltage VY also shows by the ramp component that deflection current produced in the resistance element of coil Y1 and resistance R 4 with by the deflection current to partiting dc capacitor C3 and carries out the parabolic shape component that integration produced.
The voltage signal VY of the output of output amplifier 42 is fed to the positive input of differential amplifier 34 via a direct current feedback network.The output of amplifier 42 is coupled to the voltage divider that is formed by resistance R 2 and R3, and the contact of this two resistance has been set the DC level of the feedback signal of the positive input of getting back to differential amplifier 34 by serial resistance R7.From the gain of drive(r) stage and amplifying stage, differential amplifier 34 certainly will will pass through output amplifier 42 de-energisation output signals, to keep the dc voltage level of the DC level that a reference ramp input that equals differential amplifier set up.Current sensing signal VS via capacitor C 4 that is connected in series and resistance R 7, feeds back to the positive input of differential amplifier 34 also from comprising the voltage divider of potentiometer R5 and resistance R 6.Potentiometer R5 adjusts the vertical deflection amplitude, that is, and and the grating height.Current sensing signal is similar to the reference ramp on reverse input end, and this is because the effect of negative feedback loop causes flowing through reverse current in the deflecting coil, and vertical scanning waveform linearity is turned to the reference ramp waveform.
For providing the S shape or the third level to proofread and correct, yoke current signal VS will be via capacitor C 4 integrations.Because voltage signal VS has comprised the parabolic shape waveform component that is caused by capacitor C 3, so the integration that is appended by capacitor C 4 has formed required third level correction signal.Capacitor C 4 is linked the positive input of differential amplifier 34 through resistance R 7.Therefore, when a third level correction signal was imported feedback network, differential amplifier just can manage to eliminate this third level component, causes that thus the reverse current of a third level correcting current flows through deflecting coil Y1, proofreaied and correct thereby obtain required S.
Be to produce reference ramp voltage VR, slope capacitor C 1 is by the resistance R 8 that is connected in series and R4, R5 and the R6 discharge of R9 and connection in series-parallel combination.Yet slope capacitor C 1 can produce an index shape ramp voltage by the discharge over the ground of resistance, and causes the vertical nonlinearity of displayed image thus.For avoiding vertical nonlinearity, just need a kind of linear ramp, and the acquisition of linear ramp requires the linearity discharge of capacitor C 1.For making the index shape discharge slope can linearisation, the output voltage signal VY of output amplifier 42 be exchange the contact that is coupled to series resistance R8 and R9 with resistance R 10 via capacitor C 5 resistance R 10 with resistance R 9, R4, R5 and R6 constitute a voltage divider.
Because the output of amplifier 42 has a ramp component and a parabola component, and is coupled to slope capacitor by AC, thus the exponential curve of RC discharge will inevitably partly be departed from by decurved output voltage shown in Figure 5, thus make the slope more linear.
Yet, have some shortcomings according to this method that total ramp waveform is proofreaied and correct.The amplitude of the parabola component of the output voltage V Y that correction signal is exerted an influence must be optimized so that S-correction to be provided with respect to the ramp component of voltage VY.Concerning the reference ramp waveform correction, this optimization may not be best.
In addition, the amplitude of the ramp component of output voltage V Y increases progressively in the whole start of television receiver period.This variation is because the heating of frame deflector coil causes the increase of winding wire resistance simultaneously.Moreover the variation of the manufacturing tolerance between the winding of different yoke assemblies may cause the further impedance complexification with the variation of output voltage V Y.Therefore, rely on the feedback of output voltage (VY) fully and provide the reference ramp waveform correction can cause correction error.
Characteristics according to the present invention, one second downward ramp voltage source is coupled to discharge resistance R8, with standard of compensation slope VR departing from a linear ramp.It is easily that this voltage source is taken from the current sense voltage that sampling resistor R4 two ends are produced.
Implementing when of the present invention, the end A away from discharge resistance R8 of resistance R 9 is coupled to current sense voltage VS via the cursor slide of potentiometer R5.Therefore make the voltage of A end lower in scan period.When the end of scan, evened up tendency so overcome the voltage VR of slope capacitor from the ramp signal of current sense resistance R 4 by stack.This causes resistance R 8 both end voltage to keep quite constantly, even also like this near the scanning end.Therefore, the constant voltage that is added in resistance R 8 two ends will cause the constant current from capacitor C1, thereby produce linear reference ramp waveform.Each resistance R 8-R10 is balanced, so that adjust the linearity of reference ramp with a plurality of feedback networks and a plurality of feedback signals source.
Fig. 3 illustrates the contrast of linearity correction degree, and wherein solid line waveform is to obtain by the end A that current detection signal VS is coupled to resistance R 9, and dotted line waveform obtains with should hold ground connection the time.From the quality aspect, this can be understood by observing Fig. 4, and this figure is that the voltage VA with the cursor slide place of the idiostatic device R5 of voltage VR on the capacitor C1 has done contrast.The difference Vdiff of these two voltages is quite constant, thereby produces the more constant ideal current that flows through resistance R 8 and R9.For this qualitative understanding, also do not take into account the feedback effect of output voltage through resistance R 10.
In other words and since downward slope current sensing voltage VS is coupled to differential amplifier 34 with the same input that is coupled downward-sloping reference ramp voltage VR, thereby introduced the positive feedback that helps speed-up capacitor C1 discharge.This has just compensated the capacitor C 1 slower tendency of discharging near the vertical scanning end.
In one embodiment of the invention, discharge resistance R9 is linked the cursor slide of height regulator potentiometer R5, thereby causes being added on the resistance R 8 a more signal of constant amplitude.Highly the function of Tiao Jieing is for compensating the difference on deflection sensitivity between the different deflecting coils.So, to highly potentiometric adjusting result generation-cursor slide voltage VA, owing to will on the direction opposite, change with current sense voltage VS variation via this voltage of negative feedback of resistance R 7.This just helps reducing to be added to by resistance R 9 the clean deviation of the correcting value of reference ramp capacitor C1.
Claims (15)
1, a kind of deflection circuit comprises:
Deflecting coil (Y1);
Amplifier (32,34,42), it has an output (VY) to be coupled to described deflecting coil (Y1) in order to producing electric current (IY) in deflecting coil, and an input of being coupled to described output is arranged, to constitute negative feedback;
Be coupled to the ramp generator of one of described amplifier input, it comprises:
Capacitor (C1) by recharge and discharge generation ramp voltage (VR);
Link the resistance (R8) of described capacitor (C1), in order to the charge-conduction that described ramp voltage is changed by index law to be provided;
Can be provides the capacitor charging and the current source (20) of work;
Link the switching device (22) of described capacitor (C1), in order to filling of the described repetition that produces described capacitor, discharge;
Be coupled to the current sensor device (R4) of described deflecting coil (Y1), in order to produce current sensing signal (VS) according to described yoke current (IY); The invention is characterized in also and comprise:
Be coupled first linearization device that exports described resistance (R8) to of described amplifier (42) is in order to carry out linearisation to the ramp voltage that changes by index law; With
Be coupled to described resistance (R8) and the response described current sensing signal (VS) second linearization device (R5, R9), in order to described ramp voltage is carried out further linearisation.
2, deflection circuit according to claim 1 is characterized in that: the output of described amplifier (42) is the voltage signal (VY) that its polarity and amplitude are the AC coupling, and this signal certainly will be gone up at described resistance (R8) and produce a constant voltage.
3, deflection circuit according to claim 1 is characterized in that: described current sensing signal (VS) is an AC voltage that is used to form the last constant auxiliary voltage of described resistance (R8) and is coupled.
4, according to the described deflection circuit of claim 1, it is characterized in that: described switching device (22) discharges and recharges the described repeatability of described electric capacity (C1) generation and moves for the response vertical synchronizing signal (VSYNC) that is coupled with it.
5, deflection circuit according to claim 1 is characterized in that: described amplifier (34) comprises a differential amplifier, the coupling of an input of this differential amplifier and ramp voltage (VR), and it is for forming described negative feedback second input that is of coupled connections.
6, deflection circuit according to claim 5, it is characterized in that: described negative feedback comprises the first parts (R2 of the direct-current coupling of taking from described output, R7) and take from the AC coupled of described current sensor device (R4) second parts (R5, C4, R7).
7, deflection circuit according to claim 6 is characterized in that (R5, C4 R7) comprise the potentiometer (R5) of linking described current sensing signal (VS), so that the control to deflection current amplitude (IY) to be provided to described second parts.
8, deflection circuit according to claim 6 is characterized in that: (R5, C4 R7) comprise an integrating condenser (C4) to described second parts, so that work for providing a third level correction signal that described current sensing signal (VS) is carried out integration.
9, deflection circuit according to claim 1, it is characterized in that: the output of described amplifier (42) is coupled to described deflecting coil (Y2), the tandem compound of one block capacitor (C3) and a sensing resistor (R4), described sensing resistor (R4) provide and the proportional described current sensing signal of described yoke current (IY) (VS).
10, deflection circuit according to claim 9 is characterized in that described amplifier (42) also comprises a lifting circuit (44) with its coupling, so that increase to maximum in the output signal (VY) of the described amplifier of chien shih flyback time (42).
11, a kind of deflection circuit comprises:
Deflecting coil (Y1);
Amplifier (32,34,42), it has an output same capacitor (C3), and the tandem compound of current sense resistance (R4) and described deflecting coil (Y1) is the AC coupling, so that produce sweep current (IY) in deflecting coil;
The slope capacitor (C1) of an input that is coupled to described amplifier (32) is in order to produce a batter voltage (VR) by repeating charge and discharge;
Be coupled to the slope resistance (R8) of described slope capacitor (C1), in order to the charge-conduction that described ramp voltage is changed by index law to be provided;
For slope capacitor (C1) current source (20) that charging is worked is provided;
Link the switching device (22) of described slope capacitor (C1), in order to produce the described repeatability charging and the discharge of described slope capacitor (C1); The invention is characterized in also and comprise:
Variable resistor (R5) with described sensing resistor (R4) parallel coupled, this variable resistor (R5) has a cursor slide of linking described slope resistance (R8), so that make ramp voltage (VR) linearisation of described slope capacitor (C1), described cursor slide also is coupled to an input of described amplifier (32), deflection amplitude is carried out variable negative feedback control.
12, deflection circuit according to claim 11 is characterized in that: in order to the device that described amplifier output AC is coupled to slope resistance (R8) (C5, R10) so that ramp voltage (VR) linearisation.
13, deflection circuit according to claim 11 is characterized in that: (R2, R3 is R7) to amplifier (32) input, to form the negative feedback control to a dc voltage at described amplifier (42) output in described amplifier output direct-current coupling.
14, deflection circuit according to claim 11 is characterized in that: described amplifier (42) also comprise one with the lifting circuit of its coupling and (44), in order to the output signal (VY) of this amplifier is increased to a maximum at retrace interval.
15, according to the described deflection circuit of claim 11, it is characterized in that: described switching device (22) is coupled to a vertical synchronizing signal (VSYNC), is used to make the described repeatability of itself and described slope capacitor (C1) to discharge and recharge synchronously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919113923A GB9113923D0 (en) | 1991-06-27 | 1991-06-27 | Linearization of vertical reference ramp |
| GB9113923.8 | 1991-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067999A true CN1067999A (en) | 1993-01-13 |
| CN1028066C CN1028066C (en) | 1995-03-29 |
Family
ID=10697450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92105202A Expired - Fee Related CN1028066C (en) | 1991-06-27 | 1992-06-26 | Linearization of vertical reference ramp |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3512819B2 (en) |
| KR (1) | KR100239078B1 (en) |
| CN (1) | CN1028066C (en) |
| GB (2) | GB9113923D0 (en) |
| MX (1) | MX9203649A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437413C (en) * | 2003-10-14 | 2008-11-26 | 英特赛尔美国股份有限公司 | DC-to-DC power regulator having non-linear load line and automatic leakage current offset adjustment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5332928A (en) * | 1992-12-10 | 1994-07-26 | Threepenny Electronics Corporation | Battery drain reducer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1288124B (en) * | 1966-12-05 | 1969-01-30 | Radio Corp. of America, New York, N.Y. (V.St.A.) | Vertical deflection circuit for television receivers |
| DE2240497B2 (en) * | 1972-08-17 | 1979-01-04 | Texas Instruments Deutschland Gmbh, 8050 Freising | Vertical deflection circuit for television picture tubes |
| GB1489256A (en) * | 1972-12-23 | 1977-10-19 | Sony Corp | Vertical deflection circuits |
| NL7310811A (en) * | 1973-08-06 | 1975-02-10 | Philips Nv | CIRCUIT FOR SUPPLYING A SAW TOOTH DEFLECTION CURRENT. |
| NL7314926A (en) * | 1973-10-31 | 1975-05-02 | Philips Nv | CIRCUIT FOR GENERATING A GRID EXTRACTION CURRENT. |
| JPS588794B2 (en) * | 1976-02-02 | 1983-02-17 | 株式会社日立製作所 | Vertical oscillation circuit |
-
1991
- 1991-06-27 GB GB919113923A patent/GB9113923D0/en active Pending
-
1992
- 1992-06-24 GB GB9213419A patent/GB2257584B/en not_active Expired - Fee Related
- 1992-06-26 CN CN92105202A patent/CN1028066C/en not_active Expired - Fee Related
- 1992-06-26 KR KR1019920011443A patent/KR100239078B1/en not_active IP Right Cessation
- 1992-06-26 MX MX9203649A patent/MX9203649A/en unknown
- 1992-06-29 JP JP19619092A patent/JP3512819B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437413C (en) * | 2003-10-14 | 2008-11-26 | 英特赛尔美国股份有限公司 | DC-to-DC power regulator having non-linear load line and automatic leakage current offset adjustment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05207317A (en) | 1993-08-13 |
| GB9213419D0 (en) | 1992-08-05 |
| GB2257584A (en) | 1993-01-13 |
| KR930001673A (en) | 1993-01-16 |
| JP3512819B2 (en) | 2004-03-31 |
| CN1028066C (en) | 1995-03-29 |
| MX9203649A (en) | 1993-02-01 |
| GB2257584B (en) | 1995-04-19 |
| KR100239078B1 (en) | 2000-01-15 |
| GB9113923D0 (en) | 1991-08-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 19950329 Termination date: 20100626 |