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Circuit for aging direct-current passive EMI filter

A filter and rectifier circuit technology, which is applied in the field of EMI filter aging, can solve the problems of loss, dissipation, energy waste, etc., and achieve the effect of high energy efficiency ratio, low reactive power loss, convenient and reliable use

Active Publication Date: 2020-05-22
NO 24 RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small DC loss of the filter, when the traditional method is used for aging, almost all of the input power is lost in the power resistor at the output end or the heat of the electronic load, especially for products with high rated voltage, almost 95% of the input power is consumed. Dispersed on the load, energy waste is extremely high

Method used

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  • Circuit for aging direct-current passive EMI filter
  • Circuit for aging direct-current passive EMI filter
  • Circuit for aging direct-current passive EMI filter

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing.

[0024] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0025] Such as figure 2As shown, the present invention is a circuit for aging of a DC passive EMI filter, including an isolated power supply circuit 1, a first negative feedback constant current source circuit 2, a second negative feedback constant current source circuit 3 and a constant voltage source circuit 4. The isolated power supply circuit 1 outputs three mutually isola...

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Abstract

The invention discloses a circuit for aging a direct-current passive EMI filter. The circuit comprises an isolation power supply circuit, a first negative feedback constant-current source circuit, a second negative feedback constant-current source circuit and a constant-voltage source circuit, and the isolation power supply circuit outputs three paths of mutually isolated voltages which are respectively used for supplying power to the first negative feedback constant-current source circuit, the second negative feedback constant-current source circuit and the constant-voltage source circuit. According to the invention, the first negative feedback constant-current source circuit and the second negative feedback constant-current source circuit are used for replacing a high-power load resistoror an electronic load, and the constant-voltage source circuit is used for providing an aging voltage, so that the invalid power loss is small, the system heating is small, and the working energy efficiency ratio is high; and besides, the outputs of the first negative feedback constant current source circuit, the second negative feedback constant current source circuit and the constant voltage source circuit are adjustable, so that direct current passive EMI filters of different specifications can be aged, the application range is wide, the control is simple, and the use is convenient and reliable.

Description

technical field [0001] The invention relates to the field of aging of EMI filters, in particular to a circuit for aging of DC passive EMI filters. Background technique [0002] EMI filters, also known as electromagnetic interference filters and power filters, are used to attenuate common-mode interference and differential-mode interference on the input power supply, and are usually divided into AC and DC according to the application category. Generally, the DC EMI filter is composed of passive components such as LC, which has the characteristics of high rated voltage and large rated current. [0003] Such as figure 1 As shown, when aging DC passive EMI filters, the traditional aging method adopts applying a rated DC voltage at the input end of the product, and connecting a high-power resistor or a high-power DC electronic load in parallel at the output end of the product to meet the requirements of the product. Internal passive component screening requirements. Due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/23H02M1/14
CPCH02M1/14H02M7/23H02M1/0048Y02B70/10
Inventor 李超崔庆林冉姝玲庄伟马小敏
Owner NO 24 RES INST OF CETC
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