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

A technology of switching power supply and switching power supply chip, applied in the direction of output power conversion device, electrical components, etc., can solve the problem that the fluctuation of switching power supply cannot be effectively reduced, and achieve the goal of solving the fluctuation of switching power supply, stabilizing the power supply voltage, and reducing the range Effect

Active Publication Date: 2018-02-23
GREE ELECTRIC APPLIANCES INC
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  • Claims
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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 switching power supply stability and switching power supply
  • Method and device for improving switching power supply stability and switching power supply
  • Method and device for improving switching power supply stability 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 invention provides a method and device for improving the switching power supply stability and a switching power supply. The method comprises the steps that positive output voltage and negative grounding voltage of the switching power supply are subjected to differential treatment, and first voltage is obtained; the alternating current component is removed for positive output voltage, and second voltage is obtained; the first voltage and the second voltage are subjected to comparison amplification, and differential voltage is obtained; according to the differential voltage, on-off time of the switching power supply is controlled in a negative feedback mode so as to stabilize the switching power supply. According to the method, by changing the feedback form of the switching power supply,an existing power supply voltage negative feedback form is turned into a differential negative feedback form, proper compensation is conducted according to the differential voltage, the amplitude ofpower supply noise is reduced, the effect of stabilizing the power supply voltage is achieved, and the technical problem that in the prior art, switching power supply fluctuation cannot be effectivelyreduced is solved.

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 Applications(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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