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Single-phase AC inputting electromagnetic interference killer circuit

An electromagnetic interference and single-phase AC technology, which is applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problem that electromagnetic interference cannot be effectively suppressed, and the electromagnetic interference of electrical equipment cannot meet the corresponding international standards. Or domestic standards, can not solve the problem of electromagnetic interference of switching power supply without metal shell grounding of electrical equipment

Active Publication Date: 2008-01-30
ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned general-purpose electromagnetic interference suppression circuit can solve the electromagnetic interference problem of many single-phase electrical equipment, it cannot solve the situation of electrical equipment without metal shell grounding or the electromagnetic interference problem existing in some switching power supplies, and cannot effectively realize For the purpose of suppressing electromagnetic interference, it cannot make the electromagnetic interference of all electrical equipment comply with the corresponding international or domestic standards, such as EN55022 class A or B standards

Method used

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Embodiment Construction

[0022] Figure 2 shows a single-phase AC input electromagnetic interference suppression circuit, including a common-mode inductor L1, a first capacitor C1 and a sixth capacitor C6; the common-mode inductor L1 includes a first winding N1 and a second winding N2 , the single-phase input terminals L and N of the power supply Vin are connected to the two ends of the first capacitor C1, the first terminal 1 of the first winding N1, and the first terminal 2 of the second winding N2, and the sixth capacitor C6 is connected to the first winding Between the second terminal 6 of N1 and the second terminal 5 of the second winding N2; the circuit also includes a fourth capacitor C4 and a fifth capacitor C5, and the common mode inductor L1 also includes a third winding N3, and the fourth The series branch of the capacitor C4 and the fifth capacitor C5 is connected in parallel with the sixth capacitor C6, and the first end 3 of the third winding N3 is connected to the first end 1 of the first...

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Abstract

The present invention discloses one kind of single phase AC input electromagnetic interference inhibitor circuit, and relates to single phase input EMC circuit. The circuit consists of common-mode inductor including three windings and four capacitors connected together. The present invention can inhibit high frequency harmonic waves and reach corresponding EMC standard.

Description

[technical field] [0001] The invention relates to electromagnetic interference suppression technology, in particular to a single-phase input EMC circuit capable of suppressing electromagnetic interference generated by electrical equipment. [Background technique] [0002] A general single-phase AC EMC circuit is shown in Figure 1, including: X capacitors C1, C6, Y capacitors C2, C3, C4, C5 and a common mode inductor L1 composed of two windings N1, N2; The phase input terminals (L, N) are connected to both ends of the capacitor C1 and the first terminal (1) of the winding N1 and the first terminal (2) of the winding N2, and the first terminal (1) of the winding N1 is connected to the first terminal (1) of the winding N2 One end (2) is the end of the same name each other; the series branch of the capacitor C2 and the capacitor C3 is connected in parallel with the capacitor C1, and the connection point of the capacitor C2 and the capacitor C3 is grounded; the capacitor C6 is con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 朱贤龙伍元中
Owner ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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