AC-DC conversion device capable of filtering electromagnetic interference

A technology of AC to DC and electromagnetic interference, applied in the direction of output power conversion device, irreversible AC power input conversion to DC power output, electrical components, etc., can solve the problem of insufficient effect, achieve good results, and suppress power supply harmonics Wave noise, good low-frequency electromagnetic interference characteristics of the effect

Inactive Publication Date: 2011-07-27
ELEMENTECH INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The electromagnetic interference filtering circuit 30 effectively prevents electromagnetic interference in a frequency band between 150KHz and 30MHz, especially the lowest is only 150KHz, which is insufficient; therefore, the effect is not good enough when the AC to DC conversion device 40 is used to filter electromagnetic interference.

Method used

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  • AC-DC conversion device capable of filtering electromagnetic interference
  • AC-DC conversion device capable of filtering electromagnetic interference
  • AC-DC conversion device capable of filtering electromagnetic interference

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Embodiment Construction

[0038] Please refer to figure 2 , which is a block diagram of an embodiment of an AC-to-DC conversion device capable of filtering electromagnetic interference according to the present invention. The AC-to-DC conversion device 20 capable of filtering electromagnetic interference of the present invention is applied to the AC power supply 10; the AC-to-DC conversion device 20 capable of filtering electromagnetic interference includes a half-bridge conversion filter unit 220, a common-mode inductor Lcm, and a differential-mode inductor Ldm, load terminal capacitor C3 and transformer T1. The half-bridge conversion filter unit 220 includes a first diode D1 , a power supply terminal capacitor C1 and a filter capacitor C2 .

[0039] The half-bridge conversion filter unit 220 is connected in series between the AC power source 10 and the first pin P1 and the second pin P2 of the common mode inductor Lcm; the differential mode inductor Ldm is connected in series with the second pin of ...

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Abstract

The invention discloses an AC-DC conversion device capable of filtering electromagnetic interference, comprising a half-bridge conversion filtering unit, a common mode inductor, a differential mode inductor and a load end capacitor. The half-bridge conversion filtering unit is connected among an AC power source as well as a first pin and a second pin of the common mode inductor in series. The differential mode inductor is connected between a third pin of the common mode inductor and the load end capacitor in series. The half-bridge conversion filtering unit can inhibit harmonic noise of a power supply during AC-DC conversion, thus the AC-DC conversion device capable of filtering electromagnetic interference has a better low frequency electromagnetic interference characteristic.

Description

technical field [0001] The invention relates to an AC-to-DC conversion device, in particular to an AC-to-DC conversion device capable of filtering out electromagnetic interference. Background technique [0002] Please refer to figure 1 , which is a block diagram of a known electromagnetic interference filtering circuit and an AC-to-DC conversion device. First, the AC power source 10A enters the electromagnetic interference filtering circuit 30 formed by the capacitor 22 and the common-mode inductor 24 to filter out the electromagnetic interference; The AC-to-DC conversion device 40 formed by the capacitor 28 is used to convert into a DC power supply. [0003] The electromagnetic interference filtering circuit 30 effectively prevents electromagnetic interference in a frequency band between 150KHz and 30MHz, especially the lowest is only 150KHz, which is insufficient; therefore, the effect is not good enough when the AC to DC conversion device 40 is used to filter electromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H02M1/44
Inventor 周剑柠林庆聪范盛然
Owner ELEMENTECH INT
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