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TFT-LCD display, driving circuit thereof and switching power supply

一种开关电源、控制器的技术，应用在静态指示器、仪器、电气元件等方向，能够解决EMI辐射大传导等问题，达到EMI辐射降低、减少传导影响量的效果

Active Publication Date: 2018-09-14
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a TFT-LCD display and its drive circuit, switching power supply, to solve the larger EMI radiation and existing conduction problems in the existing TFT-LCD circuit

Method used

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  • TFT-LCD display, driving circuit thereof and switching power supply

Examples

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Embodiment Construction

[0019] figure 1 is a diagram showing an example of a circuit of a switching power supply according to an embodiment of the present invention.

[0020] Such as figure 1 As shown, the switching power supply according to the embodiment of the present invention includes a pulse width modulation (PWM) controller 101, an electrical signal generator 102 and a field effect transistor Q3.

[0021] The electrical signal generator 102 can be various devices that can generate voltage signals that vary periodically among multiple voltage ranges. The electrical signal generator 102 can be an electrical signal generator specially configured for switching power supplies, or an electrical signal generator shared by switching power supplies and circuits using switching power supplies (such as TFT-LCD display circuits).

[0022] The electrical signal generator 102 outputs a voltage signal that changes periodically among multiple voltage ranges through its output pin. In one embodiment, the mu...

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Abstract

The invention provides a TFT-LCD display, a driving circuit thereof and a switching power supply. The switching power supply comprises a pulse width modulation controller, an electrical signal generator and a field effect transistor, wherein the output pin of the electrical signal generator outputs voltage signals that vary periodically among multiple voltage ranges; the frequency pin of the pulsewidth modulation controller is connected with the output pin of the electrical signal generator to receive the voltage signals; the pulse width modulation controller outputs switching signals with predetermined frequency through an output pin according to the voltage range of the voltage signals received by the frequency pin; the gate pin of the field effect transistor is connected with the output pin of the pulse width modulation controller; and the source pin of the field effect transistor is grounded. The switching power supply can be prevented from using the switching signals with the same frequency for a long time, EMI radiation of the circuit is reduced, and the influence quantity of conduction is reduced.

Description

technical field [0001] The invention relates to the field of power supply circuits, and more specifically, relates to a TFT-LCD display, a driving circuit thereof, and a switching power supply. Background technique [0002] Most of the DC-DC converter (DC / DC) circuits of thin film transistor liquid crystal displays (TFT-LCD) use switching power supplies. The switching power supply converts a higher DC voltage (such as 12V) into a lower DC voltage (such as 5V, 3.3V, 2.5V, etc.) to supply circuits such as microprocessors and image digital processors in the display. [0003] After the circuit design is completed, the switching frequency of the switching power supply is maintained at a fixed frequency, and the switches in the entire DC / DC circuit will use the same switching frequency. Such a design is likely to cause a large single-frequency electromagnetic interference (EMI) radiation. And because the switching frequency is low, when the isolation of the power board (Power boa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155G09G3/3648G09G2330/021G09G2330/06H02M1/44H02M3/156G02F1/13306G02F1/1368G09G2310/08
Inventor 黎云涛
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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