JPS6438877U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the horizontal deflection circuit of the present invention, FIG. 2 is a circuit diagram showing another embodiment of the present invention, FIG. 3 is a circuit diagram showing a conventional horizontal deflection circuit, and FIG. Figure 4 is a waveform diagram explaining the operation of Figure 3, and Figure 5 is a waveform diagram explaining the operation of Figure 3.
The figure is an explanatory diagram of left-right pincushion distortion. 1... PWM signal input terminal, 2... Integrating resistor, 3... Integrating capacitor, 11... Saturable reactor, 12... Resonant capacitor, 13... Damper diode, 14... Horizontal output transistor,
15... Horizontal deflection coil, 16... S-shaped correction capacitor, 17... Flyback transformer, 18...
...CRT, 22, 23...High voltage detection resistor, 24
...Clamp transistor.

Claims (1)

[Claims for Utility Model Registration] (1) Pulse width modulation of a constant frequency pulse,
a digital circuit that outputs a pulse width modulation signal for creating a parabolic wave; and an integrating circuit that is composed of a resistor and a capacitor and that integrates the pulse width modulation signal output from the digital circuit to create a vertically periodic parabolic wave signal. , a horizontal output circuit that supplies deflection power to the horizontal deflection coil using a horizontal output transistor that performs a switching operation in horizontal cycles, a damper diode, and a resonant capacitor, and also supplies rectified high voltage to the picture tube through a flyback transformer. and a correction means for amplitude modulating the envelope of the deflection current flowing through the horizontal deflection coil of the horizontal output circuit in a parabolic manner with a vertical period based on the parabolic wave signal from the integrating circuit; and a clamp circuit that clamps the peak value of the pulse width modulation signal output from the digital circuit to a level corresponding to the high voltage fluctuation based on the detection output from the detection means. A horizontal amplitude correction circuit characterized by comprising: (2) The horizontal output circuit supplies a drive pulse with a horizontal period to the base of the horizontal output transistor, and a damper diode and a resonant capacitor are connected in parallel between the collector and emitter, and a horizontal deflection coil and an S A circuit in which a horizontal amplitude correction capacitor and a horizontal amplitude correction transformer are connected in series is connected.
2. The horizontal amplitude correction circuit according to claim 1, wherein the collector is connected to a DC power source through a primary winding of a flyback transformer. (3) The horizontal output circuit supplies a horizontally periodic drive pulse to the base of the horizontal output transistor, and supplies a first,
Connect the series circuit of the second resonant capacitor, and
, the first resonant capacitor in parallel with each of the second resonant capacitors.
, the second damper diode is connected, and the first
A first series circuit of a horizontal deflection coil and an S-shaped correction capacitor is connected in parallel to a damper diode, and a second series circuit of a coil and a capacitor is connected in parallel to a second damper diode.
The horizontal amplitude correction circuit according to claim 1, wherein the horizontal amplitude correction circuit is configured to amplitude-modulate the voltage across the capacitor of the second series circuit based on the parabolic wave signal from the integrating circuit. .