Circuit, switching power supply and LCD drive circuit

A switching power supply and circuit technology, applied in the field of circuits, can solve problems such as reducing the conversion efficiency of switching power supplies, and achieve the effects of improving EMI quality, preventing voltage breakdown, and reducing ringing

Inactive Publication Date: 2016-12-14
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these solutions have certain effects and can reduce the amplitude of the peak voltage of the switching power supply, the energy of the reduced peak voltage is converted into a large amount of heat by the resistance heating in the circuit, which reduces the conversion efficiency of the switching power supply

Method used

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  • Circuit, switching power supply and LCD drive circuit
  • Circuit, switching power supply and LCD drive circuit
  • Circuit, switching power supply and LCD drive circuit

Examples

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Embodiment Construction

[0025] The implementation process of the embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] The switching power supply uses electronic switching devices (such as transistors, field effect transistors, thyristors, etc.), through the control circuit, to make the electronic switching devices "turn on" and "off" continuously, so that the electronic switching devices are The input voltage is pulse-modulated to realize DC / AC, DC / DC voltage conversion, and the output voltage can be adjusted and automatically stabilized. Switching power supply products are widely used in ind...

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Abstract

The invention discloses a circuit connected with a switching power supply. The circuit is characterized in that an absorption circuit comprises a switching power supply voltage peak suppression circuit used for changing a switching power supply voltage peak into an expected voltage peak, an energy storage circuit connected with the switching power supply voltage peak suppression circuit and used for storing the suppressed peak voltage, and a release circuit connected with the energy storage circuit and used for releasing the energy which is stored by the energy storage circuit and higher than an output voltage to the output end of the switching power supply when the voltage stored by the energy storage circuit is higher than the output voltage of the switching power supply. The invention also discloses the corresponding switching power supply and a corresponding LCD (Liquid Crystal Display) drive circuit.

Description

technical field [0001] The invention relates to the field of circuits, in particular to an absorbing circuit for absorbing the peak voltage of a switching power supply without loss, and a corresponding switching power supply and a liquid crystal display driving circuit. Background technique [0002] With the development of power electronics technology, switching power supplies are tending to be miniaturized and lightweight. In order to reduce the size and weight of the power supply, increasing the switching frequency is the most feasible method. Since it works at high frequency, the influence of parasitic parameters such as leakage inductance and distributed capacitance of switching transformer cannot be ignored. For example, in liquid crystal display drive circuits, based on non-isolated direct current to direct current (DC / DC) converter topology applications, since power devices (referring to electronic components with relatively large output power) work in the switching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/34H02M1/44G09G3/36
CPCG09G3/36H02M1/34H02M1/44H02M1/0038H02M1/0048H02M1/346G09G2330/025G09G2330/06H02M3/156Y02B70/10H02M1/342
Inventor 彭晓飞黄家成马胜飞
Owner BOE TECH GRP CO LTD
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