JPH03178272A - Side pin cushion circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a side pincushion circuit for adjusting the phase of parabolic waves in a display monitor.

[Conventional technology]

Fig. 2 is a circuit diagram showing a conventional side pincushion circuit. In the figure, king is a vertical deflection coil, 2 is a capacitor connected in series with vertical deflection coil 1, and 3 is a feedback resistor connected in series with capacitor 2. , 4 is a phase adjustment volume, 5 is a fixed resistor, and 6 is a differential amplifier circuit connected to both ends of the capacitor 2 via the phase adjustment volume 4 and the fixed resistor 5.

Next, the operation will be explained.

First, a vertical deflection current Q is passed through the vertical deflection coil l,
At this time, a parabolic wave P is made available to the feedback resistor 3. These vertical deflection currents and parabolic wave outputs are input to a differential amplifier circuit 6 via a fixed resistor 5 and a phase adjustment volume 4, respectively, and differentially calculated, and this differential calculation output is superimposed on the horizontal deflection current. , perform modulation of this. At this time, the phase adjustment of the parabolic wave is performed by mechanically operating the phase adjustment volume.

[Problem to be solved by the invention]

Since the conventional 'side pincushion circuit is constructed as described above, when adjusting the phase of the parabolic wave using the phase yA adjustment volume, the phase adjustment volume 4 must be operated for yA adjustment each time. First, there were problems such as the adjustment operation being cumbersome.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a side pincushion circuit that can continuously vary the amplitude and phase of a parabolic wave using a remote DC control input.

[Means to solve the problem]

A side pincushion circuit according to the present invention.

The sawtooth wave of the vertical deflection current and the peak value of the sawtooth discharge current having an opposite phase can be continuously varied by DC control using the first electronic volume. A second DC-controlled second electronic volume is provided which is input to the operational amplifier to obtain a phase output whose phase is controlled from positive to negative, and which continuously varies the peak value of the sawtooth wave of the vertical deflection current;
The sawtooth wave from this second electronic volume is integrated by an integrating circuit to obtain a parabolic wave with variable amplitude, and this parabolic wave and the phase output from the first operational amplifier are added in the second operational amplifier. It is designed to control the phase of waves.

[Effect]

The first electronic volume and the second electronic volume in this invention are configured to control the peak value of the sawtooth wave of the vertical deflection current and the sawtooth wave in opposite phase to the vertical deflection current, respectively, in response to an external DC control input by remote control. The wave height value is automatically and continuously varied, and the amplitude and phase of the resulting parabolic wave are also continuously varied so as to be supplied to the horizontal deflection circuit.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 11 is the input terminal for the vertical deflection current, 12 is the input terminal for inputting the sawtooth discharge current with the opposite polarity to the sawtooth wave of the vertical deflection current, and 13° and 14 are the peak values and vertical values of the sawtooth discharge current with the opposite polarity. A first electronic volume and a second electronic volume that respectively control the peak value of the sawtooth wave of the deflection current.
electronic volume, 15.16 is each electronic volume 13
14 is a control input terminal for supplying a DC control input for peak value control, and 17 is a control input terminal for adding and inputting the sawtooth wave of the vertical deflection current outputted through the resistor 18 and 19 and the sawtooth wave of the opposite phase. 1 is an operational amplifier, 20. 21 is a resistor that determines the amplification factor of the first operational amplifier 17, and 22
is a capacitor that cuts the DC component from the output of the first operational amplifier 17, 23 and 24 are resistors that apply DC bias to the output of the capacitor 22, 25 is an input resistor, and 26 is the second operational amplifier.
an integrating circuit that integrates the sawtooth wave output of the electronic volume 14 to generate a parabolic wave and controls the wave height value of the parabolic wave;
27 is an input resistor; 28 is a second operational amplifier that adds the parabolic wave and the phase output from the first operational amplifier to control the phase of the parabolic wave; 29.30 is a resistor that determines the amplification factor of the operational amplifier 28; 31 is a series capacitor on the output side, and 32 is an output terminal.

Next, the operation will be described. First, a sawtooth discharge current A as a vertical deflection current is input from the input terminal 11 to the resistor 18.

Resistor 19 from input terminal upper 2 through electronic volume 13
Input a sawtooth discharge current of opposite polarity to the above-mentioned sawtooth discharge current. The sawtooth voltages obtained at each of these resistors 18 and 19 are input to the first operational amplifier 17 and added, thereby obtaining a voltage output B whose phase is controlled from positive to negative. Further, the added output is passed through a capacitor 22 to cut off direct current. Also, this capacitor 22
A fixed bias is applied to the output by the DC voltage obtained by dividing the voltage by resistors 23 and 24, and the output is inputted to the second operational amplifier 28 via the resistor 25 as the phase output of the side pincushion circuit. In addition, the above electronic volume 1
4, the sawtooth wave having the opposite phase is continuously variable and adjusted to a wave height 4e by direct current control input from the control input terminal 15.

On the other hand, in the electronic volume 14 , the peak value of the sawtooth wave of the vertical deflection current is continuously variable controlled by a DC control input from the control input terminal 16 , and this is input to the integrating circuit 26 . This integrating circuit 26 generates a parabolic wave C by its integral action, and the level of the parabolic wave C can be continuously varied by controlling the peak value.

Then, this parabolic wave C and the voltage output B of the sawtooth wave described above are input to the second operational amplifier 28 and added, thereby obtaining a side pincushion output whose peak value and phase are arbitrarily set.

In the above embodiment, the peak value of each current is controlled by an operational amplifier type electronic volume, but other types of electronic volume may be used, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to continuously vary the peak value of the sawtooth wave current of the opposite phase to the sawtooth wave of the vertical deflection current by direct current control using the first electronic volume, and the sawtooth wave current of the opposite phase can be continuously varied by direct current control. and the vertical deflection current to a first operational amplifier to obtain a phase output whose phase is controlled from positive to negative, and a second DC control that continuously varies the peak value of the sawtooth wave of the vertical deflection current. A second electronic volume is provided, a sawtooth wave from the second electronic volume is integrated by an integrating circuit to obtain a parabolic wave with variable amplitude, and this parabolic wave and the phase output from the first operational amplifier are Since the configuration is configured so that the phase of the parabolic wave is controlled by addition in the operational amplifier No. 2, the peak value and phase of the sawtooth wave and parabolic wave can be controlled by DC control input by remote control. There is.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a side pincushion circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional side pincushion circuit. 13 is a first electronic volume, 14 is a second electronic volume, 17 is a first operational amplifier, 26 is an integrating circuit, 28
is the second operational amplifier. (2 other people) Figure 14: 17: 26: 28: Operational completion of the operational amplifier integration code 2 of the second electronic polymer

Claims (1)

[Claims] A first electronic volume that continuously varies the peak value of the sawtooth current whose phase is opposite to that of the sawtooth wave of the vertical deflection current, and adds the continuously variable sawtooth wave current and the vertical deflection current, and adds the continuously variable sawtooth wave current and the vertical deflection current, a first operational amplifier that outputs a negatively controlled phase output; a second electronic volume that continuously varies the peak value of the sawtooth wave of the vertical deflection current; and a sawtooth wave current from the second electronic volume that is integrated. and a second operational amplifier that adds the parabolic wave and the phase output from the first operational amplifier and adjusts the phase of the parabolic wave. cushion circuit.