Alternating current power supply filter circuit capable of meeting CE102 requirements

Abstract

The utility model provides an alternating-current power supply filter circuit capable of meeting CE102 requirements, which comprises a first differential-mode inductance magnetic ring, a second differential-mode inductance magnetic ring and a third differential-mode inductance magnetic ring, and a first capacitor is connected between the first differential-mode inductance magnetic ring and the second differential-mode inductance magnetic ring through an electric wire; a second capacitor is connected between the second differential mode inductance magnetic ring and the third differential mode inductance magnetic ring through an electric wire, and a third capacitor is connected between the first differential mode inductance magnetic ring and the third differential mode inductance magnetic ring through an electric wire. Common-mode inductors are arranged among the first differential-mode inductance magnetic ring, the second differential-mode inductance magnetic ring and the third differential-mode inductance magnetic ring. According to the alternating current power supply filter circuit capable of meeting the CE102 requirement, the first differential mode inductance magnetic ring, the second differential mode inductance magnetic ring and the third differential mode inductance magnetic ring are used in cooperation with the first capacitor, the second capacitor, the third capacitor and the common mode inductor, and conducted emission interference nearby 10 kHz to 20 kHz can be filtered out.

Description

Technical Field

[0001] The utility model relates to the electrical field, in particular to an AC power filter circuit which can meet the requirements of CE102. Background Art

[0002] In power supply design, the filter circuit is an indispensable circuit that filters out noise, electromagnetic interference and other interference from the power supply to achieve clean and stable power output. The power supply filter circuit is mainly used to reduce the harmonic components of current and voltage, and filter out common mode noise and differential mode noise in the power supply.

[0003] In actual applications, the conducted emission interference of 400Hz, 115V three-phase AC power supply near 10kHz~20kHz in the CE102 test item of electromagnetic compatibility cannot be filtered out by the filter circuit designed by the AC-DC power supply itself.

[0004] Therefore, it is necessary to provide an AC power filter circuit that can meet the CE102 requirements to solve the above technical problems. Utility Model Content

[0005] The utility model provides an AC power filter circuit that can meet the requirements of CE102, and solves the problem that in practical applications, the conducted emission interference of a 400Hz, 115V three-phase AC power supply near 10kHz to 20kHz in the CE102 test item of electromagnetic compatibility cannot be filtered out by a filter circuit designed for the AC-DC power supply itself.

[0006] In order to solve the above technical problems, the utility model provides an AC power filter circuit that can meet the requirements of CE102, including:

[0007] A first differential mode inductor magnetic ring, a second differential mode inductor magnetic ring and a third differential mode inductor magnetic ring, wherein a first capacitor is connected between the first differential mode inductor magnetic ring and the second differential mode inductor magnetic ring via an electric wire;

[0008] A second capacitor is connected between the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire, and a third capacitor is connected between the first differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire.

[0009] Preferably, the first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring cooperate with the first capacitor, the second differential mode inductor magnetic ring and the third capacitor to mainly filter out high-frequency interference on the power line.

[0010] Preferably, the common mode inductor acts to mainly suppress interference around 10kHz to 20kHz.

[0011] Preferably, the common mode inductor core is made of high inductance nanocrystalline toroidal magnetic material.

[0012] Preferably, the first capacitor and the second capacitor are connected via an electric wire.

[0013] Preferably, a common-mode inductor is provided between the first differential-mode inductor magnetic ring, the second differential-mode inductor magnetic ring and the third differential-mode inductor magnetic ring.

[0014] Preferably, the first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring are ferrite magnetic rings.

[0015] Compared with the related art, the AC power filter circuit provided by the utility model that can meet the requirements of CE102 has the following beneficial effects:

[0016] The utility model provides an AC power filter circuit that can meet the requirements of CE102. The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring are used in conjunction with the first capacitor, the second capacitor, the third capacitor and the common mode inductor to filter out the conducted emission interference near 10kHz to 20kHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a preferred embodiment of an AC power filter circuit that meets CE102 requirements provided by the utility model;

[0018] Figure 2 This is a schematic diagram of the test results without adding the full load state of this circuit;

[0019] Figure 3 This is a schematic diagram of the test results of the no-load state of this circuit;

[0020] Figure 4 This is a schematic diagram of the test results of the full-load state of this circuit;

[0021] Figure 5 This is a schematic diagram of the test results of the circuit in the no-load state. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] First embodiment

[0024] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1A schematic diagram of a preferred embodiment of an AC power filter circuit that meets CE102 requirements provided by the utility model; Figure 2 This is a schematic diagram of the test results without adding the full load state of this circuit; Figure 3 This is a schematic diagram of the test results of the no-load state of this circuit; Figure 4 This is a schematic diagram of the test results of the full-load state of this circuit; Figure 5 The figure is a schematic diagram of the test results of the circuit in the no-load state. An AC power filter circuit that can meet the requirements of CE102 includes:

[0025] A first differential mode inductor magnetic ring, a second differential mode inductor magnetic ring and a third differential mode inductor magnetic ring, wherein a first capacitor is connected between the first differential mode inductor magnetic ring and the second differential mode inductor magnetic ring via an electric wire;

[0026] A second capacitor is connected between the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire, and a third capacitor is connected between the first differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire.

[0027] The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring cooperate with the first capacitor, the second differential mode inductor magnetic ring and the third capacitor to mainly filter out high-frequency interference on the power line.

[0028] The common mode inductor is used to mainly suppress interference around 10kHz to 20kHz.

[0029] The common mode inductor magnetic core is a high inductance nanocrystalline annular magnetic ring.

[0030] High inductance nanocrystalline toroidal magnets have the characteristics of high magnetic permeability, high saturation magnetic induction intensity, and low loss. They are often used in common mode inductors, switching power supplies, inverter transformers and other fields.

[0031] A common mode inductor is arranged between the first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring.

[0032] The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring are selected from ferrite magnetic rings.

[0033] Ferrite ring is a magnetic component made of ferrite material with the following characteristics and uses:

[0034] Features:

[0035] High magnetic permeability: can effectively conduct magnetism;

[0036] Low loss: performs better at high frequencies;

[0037] High temperature resistance: adapt to higher working temperature;

[0038] Stability: Not easy to magnetize or demagnetize.

[0039] use:

[0040] Electromagnetic interference suppression: reduce electromagnetic interference and improve the performance and reliability of electronic equipment;

[0041] Signal filtering: filtering signals of specific frequencies;

[0042] Power supply filtering: reduce noise in the power supply;

[0043] Impedance matching: optimize the impedance characteristics of the circuit;

[0044] Anti-radiation: Reduce the electromagnetic radiation of equipment.

[0045] The differential mode inductor magnetic ring selects ferrite magnetic ring with X capacitor to filter out high-frequency interference on the power line. The common mode inductor plays a major role in suppressing interference near 10kHz~20kHz. The common mode inductor core selects high inductance nanocrystalline toroidal magnetic.

[0046] Compared with the related art, the AC power filter circuit provided by the utility model that can meet the requirements of CE102 has the following beneficial effects:

[0047] The utility model provides an AC power filter circuit that can meet the requirements of CE102. The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring are used in conjunction with the first capacitor, the second capacitor, the third capacitor and the common mode inductor to filter out the conducted emission interference near 10kHz to 20kHz.

[0048] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An AC power filter circuit that meets CE102 requirements, characterized in that: include: A first differential mode inductor magnetic ring, a second differential mode inductor magnetic ring and a third differential mode inductor magnetic ring, wherein a first capacitor is connected between the first differential mode inductor magnetic ring and the second differential mode inductor magnetic ring via an electric wire; A second capacitor is connected between the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire, and a third capacitor is connected between the first differential mode inductor magnetic ring and the third differential mode inductor magnetic ring via a wire.

2. The AC power filter circuit that meets CE102 requirements according to claim 1 is characterized in that: The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring cooperate with the first capacitor, the second differential mode inductor magnetic ring and the third capacitor to mainly filter out high-frequency interference on the power line.

3. The AC power filter circuit that meets CE102 requirements according to claim 1, characterized in that: The first capacitor and the second capacitor are connected via a wire.

4. The AC power filter circuit that meets CE102 requirements according to claim 1, characterized in that: A common mode inductor is arranged between the first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring.

5. The AC power filter circuit that meets CE102 requirements according to claim 4, characterized in that: The common mode inductor is used to mainly suppress interference around 10kHz to 20kHz.

6. The AC power filter circuit that meets CE102 requirements according to claim 4, characterized in that: The common mode inductor magnetic core is a high inductance nanocrystalline annular magnetic ring.

7. The AC power filter circuit that meets CE102 requirements according to claim 1, characterized in that: The first differential mode inductor magnetic ring, the second differential mode inductor magnetic ring and the third differential mode inductor magnetic ring are selected from ferrite magnetic rings.

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