emi filter and its switching power supply

A switching power supply and filter technology, which is applied in the direction of instruments, electrical components, and adjusting electric variables, etc., can solve the problems of large switching power supply and cannot meet the miniaturization requirements, and achieve the effect of saving space and simple implementation method

Active Publication Date: 2018-05-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides an active EMI filter to solve the problem that in the prior art, due to the use of a passive EMI filter circuit, the volume of the switching power supply is large and cannot meet the needs of miniaturization

Method used

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  • emi filter and its switching power supply
  • emi filter and its switching power supply
  • emi filter and its switching power supply

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Embodiment Construction

[0039] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0040] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0041] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses an EMI filter. The EMI filter is composed of an input capacitor, a transistor and a control circuit. The control signal generated by the control circuit dynamically changes the voltage at the first terminal of the transistor to compensate the voltage on the input capacitor of the switching power supply. Ripple, to get a smooth input current without switching frequency ripple. In order to prevent high-frequency harmonics from flowing into the power grid, causing harmonic pollution, and the technical implementation method of the present invention is simple, using semiconductor devices to filter out switching frequency ripples, which greatly saves space compared with passive devices, and is more suitable for full surface mounting device applications.

Description

technical field [0001] The invention relates to a power electronic technology, more specifically, to an EMI filter and a switching power supply using the same. Background technique [0002] A switching power supply is a power supply that uses modern power electronics technology to control the time ratio of the power switch tube being turned on and off to maintain a stable output voltage. At present, switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry. [0003] Switching power supply has been widely used in industrial and civil fields due to its many advantages such as high efficiency and various power conversion functions. However, due to the use of power switching devices and the electromagnetic interference generated by the switching power supply itself, the electromagnetic environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M7/162H02M3/158
CPCH02M1/44H02M7/06H03H11/02
Inventor 黄秋凯邓建
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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