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Deflection current modulating circuit

A technology of deflecting current and modulating voltage, which is applied in TV, electrical components, color TV, etc., and can solve problems such as damped oscillation at the top of the image

Inactive Publication Date: 2003-07-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current through the modulator's inductor and transistor with rapid transitions in the amplifier input voltage may include an undesired ringing component, or ringing, resulting in ringing across the width of the top of the image

Method used

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  • Deflection current modulating circuit
  • Deflection current modulating circuit

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Embodiment Construction

[0009] figure 1 A horizontal deflection circuit 10 embodying one aspect of the invention is illustrated. An operating voltage B+ is developed at one end 21 of the power coil 22a. Coil 22a is coupled to collector terminal 43 of conventional horizontal output transistor 27 . The base of transistor 27 is coupled to receive drive signal 27a from conventional horizontal sum driver stage 61 having a horizontal rate of 31,468 Hz and a corresponding period H.

[0010] Also coupled to terminal 43 is a series connection of horizontal deflection coil 30, first retrace or S capacitor 31 and coil W1 of interlead correction transformer T2. Ringing suppression network 130 is formed by diode 130 a and diode 130 b coupled in series between terminal 31 c and terminal 130 g of capacitor 31 . The ringing suppression network 130 also includes a resistor 130c and a resistor 130d coupled in parallel to the diode 130a and the diode 130b, respectively. Ringing suppression network 130 also includes...

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Abstract

A horizontal deflection circuit generates a horizontal deflection current (iy) in a deflection winding (30), during a trace interval and during a retrace interval of a deflection cycle. A transistor (26) is responsive to a vertical rate parabola signal (VIN) and to a negative feedback signal (Ve) for producing a vertical rate parabolic modulation voltage at a collector of the transistor. A negative feedback network (R26) generates the feedback signal that is indicative of a current (ie) flowing in the transistor for increasing an output impedance at the collector of the transistor. An inductor (34) is coupled to the collector of the transistor for producing in the inductor a modulation current (im) to provide for side pincushion distortion correction in an East-West modulator.

Description

technical field [0001] This invention relates to raster distortion correction for deflection circuits. Background technique [0002] In a television receiver, the electron beam in the television picture tube is deflected by the magnetic field generated by the sawtooth deflection current flowing through the horizontal and vertical deflection coils. The deflected electron beam scans the raster image on the screen of the kinescope. Raster images that are not corrected will display various geometric distortions, such as fringing or east-west pincushioning. Correction of internal raster distortion requires modulation of S-shaping as a function of the direction along the vertical axis of the raster display, ie, the distance from the top to the center and from the center to the bottom of the raster. This is accomplished by modulating the voltage across the S capacitor. The modulation voltage also passes through the horizontal deflection coils and causes modulation of the deflect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N3/23H04N3/223H04N3/233
CPCH04N3/223H04N3/2335H04N3/233H04N3/23
Inventor 詹姆斯·A·威尔伯
Owner THOMSON LICENSING SA
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