Method and device for improving stability of switching power supply, and switching power supply

A switching power supply and stability technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems that the fluctuation of switching power supply cannot be effectively reduced, and achieve the effect of solving the fluctuation of switching power supply, reducing the amplitude, and stabilizing the power supply voltage

Inactive Publication Date: 2019-10-08
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for improving the stability of a switching power supply, and a switching power supply to solve the technical problem that the prior art cannot effectively reduce the fluctuation of the switching power supply

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  • Method and device for improving stability of switching power supply, and switching power supply
  • Method and device for improving stability of switching power supply, and switching power supply
  • Method and device for improving stability of switching power supply, and switching power supply

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0024] Considering that most of the existing methods for reducing the weak current noise of switching power supplies use negative feedback, and the common frequency conversion interference is a combination of common mode and differential mode noise, the above negative feedback can only remove common mode noise, resulting in power supply It will continue to fluctuate and cannot effectively reduce the fluctuation of the power supply voltage. In summary, the existing methods have the technical problem of being unable to effectively reduce the fluctuation of the switching power supply. In view of ...

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Abstract

The present application provides a method and device for improving the stability of a switching power supply, and a switching power supply, wherein the method includes: differentially processing the positive output voltage and the negative ground voltage of the switching power supply to obtain the first voltage; The AC component is removed to obtain the second voltage; the first voltage and the second voltage are compared and amplified to obtain the difference voltage; according to the difference voltage, negative feedback controls the switching time of the switching power supply to stabilize the switching power supply. This method changes the feedback form of the switching power supply from the existing power supply voltage negative feedback form to the differential negative feedback form, and makes appropriate compensation according to the difference voltage, reduces the amplitude of power supply noise, and realizes the stability of the power supply voltage. effect, thereby solving the technical problem that the prior art cannot effectively reduce the fluctuation of the switching power supply.

Description

technical field [0001] The invention relates to the technical field of power supply control, in particular to a method and device for improving the stability of a switching power supply, and a switching power supply. Background technique [0002] When the frequency conversion fan is started, if the weak current noise is not handled well, it will easily cause great interference to the touch control of the controller, which will generally lead to "random jumping points", "slow touch response", "automatic reporting" and so on on the touch panel. Phenomenon. [0003] The common frequency conversion interference is: the interference of a certain frequency is superimposed on the DC power supply, and the interference is a combination of common mode and differential mode noise, which cannot be filtered out by a simple common mode inductor, resulting in continuous fluctuations in the power supply (ie GND is not 0, Vs is unstable), figure 1 It shows the fluctuation process of the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
CPCH02M1/14H02M1/0006
Inventor 玉俊威李涛钟金扬郑毅韦国全
Owner GREE ELECTRIC APPLIANCES INC
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