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Protective circuit of horizontal transistor and display with said circuit

A technology for protecting circuits and transistors, which is applied in the direction of TV, electrical components, and TV system scanning details, etc., and can solve problems such as damage to horizontal transistor Q2 and product yield reduction

Inactive Publication Date: 2004-08-18
BENQ CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, under normal conditions, the transistor of horizontal transistor Q2 is voltaged across V CE It is about 1000V ~ 1100V. However, when the central processing unit is reset, the transistor cross-voltage VCE of the horizontal transistor Q2 may fluctuate as high as 1400V, which seriously damages the horizontal transistor Q2 and reduces the product yield.

Method used

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  • Protective circuit of horizontal transistor and display with said circuit
  • Protective circuit of horizontal transistor and display with said circuit
  • Protective circuit of horizontal transistor and display with said circuit

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Embodiment Construction

[0015] refer to figure 2 , which shows a circuit diagram of a protection circuit for a horizontal transistor according to a preferred embodiment of the present invention. The horizontal transistor protection circuit 200 of the present invention can be used in a display. The horizontal transistor protection circuit 200 is composed of a power switch detection device 202 and a switching circuit 204 . The switch circuit 204 is used to connect to at least one sub-capacitor in the S-shaped correction circuit 108 , such as the sub-capacitor CS0 . When the switching circuit 204 is activated, the switching circuit 204 is used to make the connected secondary capacitor CS0 parallel to the main capacitor. The power switch detection device 202 is used to detect whether the DC voltage source B+ is turned off. When the power switch detection device 202 detects that the DC voltage source B+ is turned off, the power switch detection device 202 starts the switching circuit 204 .

[0016] W...

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Abstract

A protection circuit for horizontal transistor is composed of a switching circuit and an on-off checker of power supply. Said switching circuit connected to at least one secondary capacitor in S-type compensating circuit can make said secondary capacitor parallelly connect with the primary capacitor in S-type compensating circuit. Said checker can check if the power supply is on or off. If it is turned off, the switch circuit is actuated. It can protect the horizontal transistor and increase its rate of finished products.

Description

technical field [0001] The invention relates to a protection circuit of a horizontal transistor and a display with the circuit, in particular to a protection circuit suitable for a horizontal transistor in a picture tube and a display with the circuit. Background technique [0002] In recent decades, due to the continuous advancement of electronic technology, color TVs have developed towards large screens, high image quality and high sound quality. The color TV is to use a picture tube (CRT) with the advantages of fast display speed, sufficient picture brightness, and good color linearity, as an electronic image display device. In the synchronous deflection circuit necessary to form the image of the picture tube, a vertical deflection circuit and a horizontal deflection circuit are included, so that the picture tube can correctly reproduce the picture. [0003] The vertical deflection circuit deflects the electron beam of the picture tube in the up and down direction, while...

Claims

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Application Information

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IPC IPC(8): H04N3/16H04N3/23
Inventor 杨信忠林志信
Owner BENQ CORP