Power supply circuit and TV set with said power supply circuit

A technology for power supply circuits and televisions, applied to televisions, circuits, color televisions, etc., to achieve high reliability, reduce volume, and improve reliability

Active Publication Date: 2010-03-10
HISENSE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the height of the liquid crystal TV power supply in the prior art, the present invention provides a new type of power supply circuit. By adopting the method of parallel connection of double transformers, it not only effectively solves the problem of the height of the power supply, but also satisfies the requirements of the LCD TV. High power output requirements, high reliability and practicability

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  • Power supply circuit and TV set with said power supply circuit

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Embodiment Construction

[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] There needs to be a 24V / 12A power output in the LCD TV power supply, which is usually implemented by a single-ended flyback circuit and requires a larger transformer. In this invention, we use two EER4220 horizontal ferrite cores, the height is only 32mm, and the output power can reach 160W, using two parallel connections, the output power just meets the 300W high-power output requirements of the 42-inch LCD TV power supply . For its parallel connection circuit diagram, see figure 1 shown.

[0012] figure 1 Among them, after the primary windings of the two transformers TE005 and TE006 are connected in series, one end is connected to the 380V high-voltage input terminal INPUT, and the other end is connected to the MOS tube switch circuit. Wherein, the source of the P-channel MOS transistor is connected to the primary winding...

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Abstract

The invention discloses a power circuit and a TV set with said power circuit, which reduces the volume of power by the method of double transformers in parallel and under the condition that confirmingthe output power of power source, as well as meets the requirement for power height of LCD TV set. The invention keeps the consistency between currents flowing along said two transformers by designing the primary winding of double transformer in series, to reduce the noise effectively and improve the reliability of product. In addition, the secondary winding is designed in parallel to increase the output current and the output power without winding in big diameter, while meeting the demand for outputting high power of the power source of LCD TV set. The invention has simple and effective circuit which solves the height of transformer when the power outputs high power in limited height, with the advantages of high reliability, lower noise and lower EMI interference. So it has wide application in the field of panel display.

Description

technical field [0001] The invention relates to an improvement of a power supply circuit, in particular to an ultra-thin power supply circuit applicable to large-screen liquid crystal televisions. Background technique [0002] At present, the power supply of domestic large-screen LCD TVs mainly relies on imported or directly imported foreign technology for production, because the power supply of large-screen LCD TVs requires lightness, thinness, high power factor and work efficiency, and strict requirements on output voltage ripple. There are also high requirements for suppressing noise and anti-EMI functions, especially in a 42-inch LCD TV power supply with 300W output, it is difficult to meet the above requirements. This is mainly because the thickness requirements of flat-panel TVs are particularly strict, and the height of the transformer is the main contradiction. In order to solve the height problem, there are usually two solutions: one is to increase the operating fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/10H02H3/20H01H7/04H04N5/63
Inventor 刘广学辛晓光
Owner HISENSE
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