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An implementation method and circuit for low voltage output loop of plasm TV power supply

A technology of low-voltage output and implementation method, which is applied to the parts of color TV, parts of TV system, TV, etc., can solve the problems of insufficient pins, increased cost, high cost, etc., to solve the problem of insufficient pins and realize high efficiency , low cost effect

Inactive Publication Date: 2008-01-16
吴壬华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One method is to make a special transformer skeleton, which solves the problem of insufficient pins due to the large number of output channels, as shown in Figure 2 (taking 4 output channels as an example); but because there are too many output channels of the transformer, the It will inevitably lead to the problem that the secondary turn ratio of the transformer is not easy to determine, and the transformer skeleton needs to be molded separately, which will increase the cost
[0006] Another method is that the main transformer only has 2 to 3 circuits, and the other uses a buck circuit. Since the main transformer only has symmetrical windings (such as 12V and 24V), this solves the problem that the turn ratio of the secondary side of the transformer is not easy to determine. See Figure 3 (take 4-way output as an example); but because the other several ways need to be output by buck circuit, the cost is relatively high, and the efficiency is relatively low (<94%)

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  • An implementation method and circuit for low voltage output loop of plasm TV power supply
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  • An implementation method and circuit for low voltage output loop of plasm TV power supply

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Embodiment Construction

[0028] In order to facilitate a further understanding of the present invention, the present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Please refer to Figure 4, including the main transformer (T1), the first rectifier diode (D1), the second rectifier diode (D2), the third rectifier diode (D3), the fourth rectifier diode (D4), and the fifth rectifier diode (D5) and the sixth rectifier diode (D6), at least one autotransformer (T2); the first filter capacitor (C1), the second filter capacitor (C2), the third filter capacitor (C3); the second autotransformer (T2), the seventh rectifier diode (D7), the eighth rectifier diode (D8), the fourth filter capacitor (C4);

[0030] The primary side of the main transformer (T1) is connected to the output of the resonant circuit, the C terminal of the secondary side is connected to the anode of the first rectifying diode (D1), the D terminal is connected to the anode of the ...

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Abstract

The invention discloses an implementation method of low-voltage output loop for plasma TV power supply and the circuit thereof. The circuit thereof includes a main transformer (T1), a first commutation diode (D1), a second commutation diode (D2), a third commutation diode (D3), a fourth commutation diode (D4), a fifth commutation diode (D5), a sixth commutation diode (D6), and at least one autotransformer (T2); wherein the primary side of the main transformer (T1) is connected with the output of a resonance circuit, the C end of the secondary side is connected with the anode of the first commutation diode (D1), the D end is connected with the anode of the second commutation diode (D2), the F end is connected with the anode of the third commutation diode (D3), the G end is connected with the anode of the fourth commutation diode (D4), and the E end is earthed. The invention solves the problem of insufficient transformer base pins due to too many output lines, and furthermore the transformer secondary side has the advantages of convenience for adjusting the turn ratio, low cost and high implementation efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and circuit for realizing a low-voltage output circuit of a PDP (plasma television) power supply. Background technique [0002] PDP (Plasma TV) power supply is the heart of the whole TV, responsible for providing power supply for all screens and signal boards. As shown in Figure 1, its output is generally divided into four parts, the standby output part (generally 5V), the Vs circuit part (generally 175 ~ 210V), the Va circuit part (generally 55 ~ 85V), LV (low voltage output ) loop part. Among them, the LV circuit is the most complicated, and the LV circuit is also different according to the different requirements of the screen and signal board. Generally composed of 33V, 24V, 15V, 12V, 9V, 5V, 3.3V. The least consists of three outputs (12V, 24V, 5V), and the most consists of 7 outputs. The general PDP power supply is composed of 4 or 5 channels. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/63
Inventor 吴壬华李英
Owner 吴壬华
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