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A device for reducing low frequency ripple of dc output

A ripple and low-frequency technology, applied in the field of power supply or source-loaded devices, to achieve the effect of reducing low-frequency ripple

Active Publication Date: 2021-06-22
江苏凯创电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide a device for reducing DC output low-frequency ripple to solve at least one problem existing in the prior art

Method used

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  • A device for reducing low frequency ripple of dc output
  • A device for reducing low frequency ripple of dc output
  • A device for reducing low frequency ripple of dc output

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Embodiment Construction

[0053] In order to make the purpose, technical solution and advantages of the application more clear, the technical solution in the embodiment of the application will be described in more detail below in conjunction with the drawings in the embodiment of the application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application. 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. Embodiments of the present application will be described in detail below in conjunction with th...

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Abstract

The application belongs to the field of low-frequency ripple suppression circuits, and in particular relates to a device for reducing DC output low-frequency ripple. It includes a DC-DC conversion main power circuit for adjusting the DC voltage at its input end to the DC voltage at its output end, a feed-forward sampling circuit, the input end of which is connected to the input end of the DC-DC conversion main power circuit, Obtain the input voltage Vin of the DC-DC conversion main power circuit, a feedforward circuit, be connected with the output terminal of the described feedforward sampling circuit, extract the AC component Vac in the input voltage Vin of the DC-DC conversion main power circuit, a The digital signal processing unit is used to adjust the PWM duty cycle according to the extracted AC component Vac, so as to control the output of the DC-DC conversion main power circuit. The present application can effectively reduce the low-frequency ripple of the DC output without affecting the overall power density.

Description

technical field [0001] The present application belongs to the field of low-frequency ripple suppression circuits, and in particular relates to a power supply or source-carrying device for reducing DC output low-frequency ripple. Background technique [0002] Low-frequency ripple refers to the AC component superimposed on the output DC stability, which is generally caused by the 100HZ power frequency AC signal in the power grid. In order to reduce the power frequency ripple, a commonly used method is to increase the inductance and capacitance parameters of the output low-frequency filter to reduce the low-frequency ripple to the required index. For example: through the relationship between the output ripple and the output capacitor: vripple=Imax / (Co×f), it can be seen that increasing the value of the output capacitor can reduce the ripple, but this method will affect the response speed of the switching power supply. Another method is to use a DC-blocking feed-forward correct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/335H02M1/42
CPCH02M1/14H02M1/4258H02M3/33515H02M3/33523Y02B70/10
Inventor 不公告发明人
Owner 江苏凯创电子科技有限公司
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