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Television set degaussing circuit

A technology for degaussing circuits and TV sets, which is applied in the direction of scanning details and electrical components of TV and TV systems.

Inactive Publication Date: 2010-02-10
SHENZHEN TCL NEW-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a TV degaussing circuit to solve the problem of excessive surge current when the relay in the existing CRT TV picture tube degaussing circuit is switched on and off

Method used

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  • Television set degaussing circuit
  • Television set degaussing circuit

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Embodiment Construction

[0021] The basic principle of the present invention is to select the triac instead of the relay as the switching element, and use the zero-crossing detection circuit to trigger the conduction of the bidirectional thyristor when the voltage at both ends of the triac is detected to cross zero, so that the degaussing circuit can only It starts when the voltage across the silicon ends crosses zero, thus avoiding the current shock.

[0022] A detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0023] The circuit diagram of the embodiment of the present invention is as figure 2 As shown, among them, triac T1, degaussing resistor RT and degaussing coil L1 are connected in series to form a degaussing circuit.

[0024] A winding N1 is wound on the switching power supply transformer, and the induced voltage at both ends of the winding N1 is rectified through the first diode D1, and a DC voltage U is obtained after being fi...

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PUM

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Abstract

The present invention discloses a degaussing circuit for a television. The circuit comprises a degaussing return circuit which is formed by connecting a bothway silicon controlled rectifier (T1), a degaussing electrical resistance, and a degaussing coil connected in series, the circuit also comprises a delay trigger circuit which triggers the bothway silicon controlled rectifier and a crossover point detecting circuit which detects the voltage of the two ends, wherein, when the voltage of the two ends of the bothway silicon controlled rectifier is zero detected by the crossover point detectingcircuit, the bothway silicon controlled rectifier is allowed to switch into conduction. The present invention overrides the disadvantage of the prior art, adopts the bothway silicon controlled rectifier to replace the switch component of the electrical relay, adopts a crossover point detecting circuit to control the conduction of the bothway silicon controlled rectifier, and makes the contact free switch of the silicon controlled rectifier only conducts when the voltage of the two ends is zero, which fundamentally eliminates the heavy current impact and the electromagnet interference caused.The present invention adopts a fully electrical soft switch to conduct and switch off, thereby, the service life is long, and the degaussing circuit has no sound when being switched off.

Description

technical field [0001] The invention relates to the technical field of CRT motors, in particular to the degaussing technology of a picture tube of a CRT TV. Background technique [0002] At present, the degaussing control of large-screen CRT picture tubes generally adopts the following methods: figure 1 In the way shown, the contacts of a relay are connected in series in the degaussing circuit, and the on-off of the relay is controlled by the microprocessor CPU to achieve the purpose of degaussing. When starting up, the CPU sends a high-level signal to close the relay contact, and connect the degaussing circuit. The picture tube is gradually demagnetized under the action of the alternating magnetic field of the degaussing coil. After a few seconds, the degaussing action is completed. At this time, the CPU gives A low-level signal turns off the relay, and the degaussing circuit is disconnected from the power grid to complete the entire degaussing process. [0003] The reaso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N3/16
Inventor 王坚
Owner SHENZHEN TCL NEW-TECH CO LTD