TH24930A - A circuit for generating grid voltage for a cathode ray tube in a television set? - Google Patents

Abstract

The conventional cathode ray tube, which includes a component called a vector gun, requires only an unmodulated focusing voltage and a bias voltage for grid 2. Normally, the focusing voltage and grid voltage are isolated from the voltage divider. As a result, leakage current within the cathode ray tube, which produces current into the voltage divider, can cause undesirable changes in the grid voltage, leading to color degradation or color changes. The aim is to construct a simple circuit to minimize such changes in the grid voltage caused by the cathode ray tube leakage current. In accordance with this invention, a pulse voltage source (P) is isolated from the potentiometer (A) via a rectifier circuit (DI,DI). The voltage (UG 2) for grid 2 of the cathode ray tube (1) is isolated from the adjuster (S) of the potentiometer (5). This is specifically intended for use with television sets that have a cathode ray tube with a vector gun.

Claims (5)

1. Circuit for generating grid voltage for cathode ray tube (1) in a television set. In the case of a circuit with a cathode ray tube grid. Receive a connection to the adjuster (S) of the potentiometer, which It consists of components of a pressure divider, which includes the... Several resistors (2-6) are connected to the voltage. For focused (IUFe) with specific power supply characteristics. The pulse type push (p) will be connected to the splitter (A) on 5-way potentiometer rectifier circuit (DI, DI) 2. A circuit consistent with claim 1 that has specific characteristics. Featuring a pulsed voltage source molded from a coil. The primary (WI) of a linear transformer (Tr) of the level line. output 3. A circuit consistent with claim 2 that has specific characteristics. The rectifier input (DI,DI) is connected. The connection point (P) between the primary coil (WI) and The transistor for push-button switching (T1) acts as a switch. Linear frequency switch 4. A circuit consistent with claim 1 that is of a specific nature. A separate connector (A) has been selected so that the DC voltage The current supplied by the rectifier circuit (DI, DI) will have the same magnitude. Approximately with the DC voltage which appears on the splitter (A) as follows: This is the result of the focusing input voltage (Ufe) which is obtained. Applications to the pressure divider (2-6) 5. A circuit consistent with claim 1 that has specific characteristics. It has a voltage divider (2-6) and a line (7) which leads to the connector. The isolation (A) from the output of the rectifier circuit (DI,DI) is obtained. Formed using printed conductor technology. (5 claims, 1 page, 1 image)