A switching power supply and TV

A switching power supply, power supply technology, applied in the direction of TV, color TV, color TV components, etc., can solve the problems of high cost, inability to protect, low power conversion efficiency, etc., to improve stability, reduce system costs, improve The effect of power efficiency

Active Publication Date: 2020-11-17
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing power supply design scheme has the defects of low power conversion efficiency, high cost, LED backlight cannot be turned on normally when the core is lightly loaded, and cannot be protected when the LED backlight is abnormally overvoltage

Method used

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  • A switching power supply and TV
  • A switching power supply and TV
  • A switching power supply and TV

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1 It is a schematic structural diagram of a switching power supply provided by Embodiment 1 of the present invention. The switching power supply disclosed in this embodiment can provide a constant voltage source and a constant current source at the same time, and is especially suitable for the field of liquid crystal televisions, and is also suitable for related fields such as liquid crystal displays, projectors, medical equipment, and military industrial equipment. The application scenario of the switching power supply is illustrated by taking a liquid crystal TV as an example, and the constant current load is an LED light bar. The switching power supply provided by this embodiment can effectively improve the efficiency of the power supply system, realize stable startup of the TV, and has low cost and high power factor. For details, see figure 1 As shown, the switching power supply includes: power factor correction PFC control management constant voltage modul...

Embodiment 2

[0048] image 3 It is a schematic structural diagram of a switching power supply provided by Embodiment 2 of the present invention. On the basis of the above-mentioned embodiments, this embodiment further optimizes the structure of the switching power supply. By adding a high-voltage pre-start circuit, when the TV is powered off from power-off to power-on standby, the constant voltage circuit for PFC control and management is realized. Provides a stable power supply voltage, which can also effectively reduce the standby power consumption of the system; by adding an overvoltage protection circuit, it can ensure that the output voltage of the constant current transformer will not be too large, and avoid damage to the LED due to the excessive output voltage of the constant current transformer Light. For details, see image 3 As shown, the switching power supply includes:

[0049] Power factor correction PFC control management constant voltage circuit 110, constant voltage tran...

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PUM

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Abstract

Disclosed in the embodiments of the present application are a switching power supply and a television. The switching power supply comprises a PFC control and management constant voltage module, a PFC control and management constant current module, and a linear constant voltage module; the PFC control and management constant voltage module is configured to increase the power factor of a constant voltage output and output a constant voltage to supply power for a host chip; the PFC control and management constant current module is configured to increase the power factor of a constant current output and output a constant voltage to supply power for a constant current load; the linear constant voltage module is configured to supply relay power for the power end of the PFC control and management constant current module by means of the voltage of a first input end and the voltage of a second input end in sequence during the process of the system from standby to power-on light load, so as to enable the constant current load to start normally.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power supply control, in particular to a switching power supply and a television. Background technique [0002] With the rapid development of LED (Light Emitting Diode, Light Emitting Diode) liquid crystal televisions, currently, LED liquid crystal televisions have been popularized in thousands of households. [0003] Existing LED LCD TVs adopt the design method of power board + constant current board, in which the power board is responsible for providing suitable input voltage for the constant current board and TV main board, and the constant current board is responsible for providing constant current for the LED backlight module. The power board + constant current board are collectively referred to as switching power supply. When the TV is working, the switching power supply realizes constant voltage and constant current output, which not only needs to meet the constant current de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/63
CPCH04N5/63
Inventor 陈建忠杨寄桃沈思宽
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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