استخدام الثايرستور (scr) في دارة الخرج الأفقي .. كتاب التلفزيون الملون والعادي

17-13 Use of thyristor (SCR) in the horizontal output circuit:

The main objective of the horizontal deflection circuits is to generate a linear current in the deflection coils to cause the image diode beam to sweep the screen in straight lines.

Some factories include Silicon-Controlled rectfiers (SCR) circuits, and diagram (17-23) shows one of these circuits.

The diode  and the thyristor SCR provide the switching process that controls the current of the deflection coils Lx during the beam period in the screen line scanning valve.

The diode D2 and the thyristor 2 SCR control the current during the line return period. and items -
( LR - CR - CH - and CY ) provides the necessary potential energy and the timing process. As for the Lar file, it provides the charging path for the capacitor (CH CR from the +B feed). As for the Laz file, it secures the gate current for the thyristor (Laz - SCR) forming the T102 transformer, and the Long Las files forming the T102 transformer - and the CH capacitor controls the line return time because it is charged to the +B voltage via L.

17-14 High Voltage Transformer in Color TV:

The high voltage transformer in monochrome and color television is very similar in appearance. It is larger in color TV because it requires additional files and a larger capacity. In Figure (17-24) we find several types of high voltage transformers for different devices.

Its scheme is for color TV in Fig
(17-25) The high voltage transformer with two valves. The other picture shows the high voltage transformer for a transistor color TV with solid elements for rectification.

In the valve type, the valves are used as a horizontal output amplifier - double damping - the voltage booster - and the high voltage rectifier. They are often located near the high voltage, and are fed from the top of the valve by means of insulated cables at the end of which is a cap that connects the voltage to the valve.

In the transistor type, the high-voltage rectifier is made of solid elements in the form of a rod connected from the top to the secondary coil of the transformer, and its lower end is connected to the screen elevator.