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LED dimming drive circuit and switching power supply

A technology of dimming drive and switching power supply, applied in the field of LED dimming drive circuit and switching power supply, can solve the problems of low LED load dimming accuracy and limited LED load dimming depth, etc.

Pending Publication Date: 2019-11-12
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LED dimming driving circuit in the existing switching power supply usually only works in the critical conduction mode, which leads to the limitation of the dimming depth of the LED load and the low dimming accuracy of the LED load

Method used

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  • LED dimming drive circuit and switching power supply
  • LED dimming drive circuit and switching power supply
  • LED dimming drive circuit and switching power supply

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Experimental program
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Embodiment Construction

[0048] The core of the present invention is to provide an LED dimming driving circuit and a switching power supply, which increases the dimming depth of the LED load and improves the dimming precision of the LED load.

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] Please refer to figure 1 , figure 1 It is a schematic structural diagram of an LED dimming driving circuit provided...

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Abstract

The invention discloses an LED dimming drive circuit and a switching power supply. The LED dimming drive circuit comprises a power switch tube cut-off time control circuit, a power switch tube conduction time control circuit and a power switch tube drive circuit. When a dimming voltage of the dimmer is higher, it indicates that the brightness of an LED load needing to be adjusted is larger, that is, the value of the current output to the LED load by the switching power supply is larger, the working frequency corresponding to a critical conduction mode can meet the LED dimming brightness requirement at the moment, so the LED dimming drive circuit works in the critical conduction mode when the dimming voltage is larger. When the dimming voltage is lower and a deep dimming mode is required, the working frequency corresponding to the critical conduction mode cannot meet the LED dimming brightness requirement at the moment, so the LED dimming drive circuit works in an intermittent working mode capable of further reducing the working frequency, the current value of the LED load is further reduced, the dimming depth of the LED load is increased, and the dimming precision of the LED load is improved.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to an LED dimming drive circuit and a switching power supply. Background technique [0002] With the development of the electronic information industry, switching power supplies are gradually widely used in the field of LED (Light Emitting Diode, light emitting diode) lighting. At present, the function of switching power supply is to convert external AC power (such as mains 220V, 380V, etc.) into a stable DC power supply for LED loads. However, as user demands continue to increase, LED dimming has become a major development trend. LED dimming is realized by adjusting the current output from the switching power supply to the LED load. However, the LED dimming driving circuit in the existing switching power supply usually only works in the critical conduction mode, which leads to a limited dimming depth of the LED load and a low dimming accuracy of the LED load. [0003] Ther...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30Y02B20/40
Inventor 陈泽强刘娜邓超张炜
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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