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A switching power supply and brightness adjustment device

A technology of switching power supply and brightness adjustment, which is applied in the direction of electric light source, lighting device, electric lamp circuit layout, etc., can solve the problems of light off and low duty cycle of PWM signal, etc.

Active Publication Date: 2019-11-01
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a switching power supply and a brightness adjustment device to solve the problem of turning off the light when the duty cycle of the PWM signal is too low in the prior art

Method used

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  • A switching power supply and brightness adjustment device
  • A switching power supply and brightness adjustment device

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0043] The invention provides a switching power supply to solve the problem in the prior art that the light goes out when the duty ratio of the PWM signal is too low.

[0044] Specifically, see figure 1 , the switching power supply includes: a first switching tube S1, a second switching tube S2, a filter module and an operational amplifier EA; wherein:

[0045] The input terminal of the first switch tube S1 receives the first reference voltage VREF1;

[0046] The input terminal or the out...

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Abstract

The invention provides a switching power supply and a brightness adjustment device comprising the switching power supply. According to the invention, a first switching tube and a second switching tubeare complementary conducted, and the voltage received by an in-phase input end of an operational amplifier is enabled to be a complementary input result of first reference voltage and second reference voltage; when the duty ratio of PWM signals is too low, the proportion of the first reference voltage inputted into the in-phase input end of the operational amplifier is very small, and the proportion of the second reference voltage inputted into the in-phase input end of the operational amplifier is correspondingly increased, thereby playing a supporting role for the voltage received by the in-phase input end of the operational amplifier, and avoiding a problem that the output of the switching power supply is affected to result in turn-off of a lamp because the voltage received by the in-phase input end of the operational amplifier is too low.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a switching power supply and a brightness adjustment device. Background technique [0002] With the popularity of smart terminals, most of the smart terminals have the function of automatically adjusting the brightness of the screen according to the brightness of the environment. For example, in many cases, smart phone users will look at the phone at night or in a dark environment; in this case, the smart phone will send a PWM signal with a very low duty cycle through the PWM interface to control the output of the switching power supply. To adjust the brightness of your own screen and protect your eyes. [0003] However, in the above-mentioned adjustment process, when the duty cycle of the PWM signal is too low (for example, below 1%), so as to affect the output of the switching power supply, it will cause a black screen, which is not conducive to the application of sm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCH05B47/10H05B47/11Y02B20/40
Inventor 胡三亚
Owner SHANGHAI AWINIC TECH CO LTD
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