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Peak over-current protection of switch voltage stabilization power adjusting pipe

A switching regulated power supply, overcurrent protection technology, applied in the field of television and electronics, can solve the problem of complex overload protection circuit

Inactive Publication Date: 2010-09-29
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the overload protection circuit of the switching power supply itself is relatively complicated. Can the simplest and most effective overload protection of the switching power supply tube be realized?

Method used

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  • Peak over-current protection of switch voltage stabilization power adjusting pipe
  • Peak over-current protection of switch voltage stabilization power adjusting pipe

Examples

Experimental program
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Embodiment Construction

[0007] The best way to realize the present invention will be described in detail below in conjunction with the accompanying drawings. It is no longer necessary to repeat what has been mentioned above or in combination with the existing technology or should be changed in the same way.

[0008] [ figure 1 Example]: After the direct sampling of the present invention, the stable control loop and the soft start circuit 4 pass through the photocoupler N, and then pass through the final control tube VN to modulate the on / off of the switching power supply tube V.

[0009] It is taken from the direct rectification wave capacitor Z of the power grid, and is used as the starting resistor through the resistor R1, rectified by the secondary diode U34B of the switching power supply transformer, filtered by the capacitor C34B, and then used as the output terminal bias of the optocoupler N, and applied to the variable voltage switching power supply (ie : Lifting switching power supply, paral...

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PUM

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Abstract

The disclosed switch stabilized voltage adjustment tube V for peak over-current protection comprises: on the main loop of tube V, serial connecting a peak over-current sampling resistor R3; connecting a diode (or stabilized tube) V35 branch with the terminal-control tube VN or VP base; on the secondary of switch transformer or work-frequency transformer T, filtering by diode U61 and polar rectification capacitor C61, and connecting the over-load turn-off device with voltage- sensitive switch device D9. This invention has well performance with low cost.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to the field of television technology. Background technique [0002] The prior art switching power supply (also known as switching power supply) can be divided into series switching power supply and transformer The two main characteristics of the switching power supply (ie: lifting type, parallel connection). According to the oscillation mode, quasi-resonant fully excited switching power supply and self-excited switching power supply are commonly used now. Quasi-resonant pure it-excited switching power supplies are integrated. The internal circuit is very complex but the external components are small. The oscillator does not need transformer coupling to generate, and only needs reverse polarity rectification and quasi-resonance to delay the synchronous signal. Therefore, it can adapt to a wide fluctuation range of the input power grid and still maintain an excellent switching ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08H02H7/10
Inventor 戴俊
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD