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EMC equipment

A device, high-frequency interference technology, applied in the field of EMC equipment, can solve problems affecting the performance of LLC resonant converters, space interference, etc., to achieve the effect of improving performance and reducing high-frequency interference

Active Publication Date: 2008-09-24
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if it is properly shielded, the filter of the switching power supply is still in a strong space radiation environment, which is easy to pick up space interference and affect the performance of the LLC resonant converter

Method used

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Embodiment Construction

[0017] The principle of the present invention is as follows: EMC equipment generally includes a device susceptible to high-frequency interference, and the present invention connects capacitors in parallel on the device susceptible to high-frequency interference. The device susceptible to high-frequency interference is an inductor.

[0018] like figure 1 The switching power supply shown includes an AC power source 1 , an AC filter 2 , a power factor correction circuit (PFC) 3 , a DC / DC converter 4 and a DC filter 5 . The AC filter 2 is connected between the AC power source 1 and the power factor correction circuit 3 , and the DC / DC converter 4 is connected between the power factor correction circuit 3 and the DC filter 5 . like Figure 2a As shown, the AC filter 2 is used to filter out the interference output by the DC / DC converter 4 through the PFC3. The AC filter 2 is divided into multiple stages, and the filter inductance DIFF L of the first stage is easy to pick up and ha...

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Abstract

The invention discloses an EMC device which includes an apparatus that is easily interfered by high frequencies. The apparatus that is easily interfered by high frequencies is connected with a capacitance in parallel. The invention is connected with a capacitance in parallel on the apparatus that is easily interfered by high frequencies; when the frequency is low, the action of the capacitance is weak; when the frequency is high, the condenser component of the capacitance is diminished, the high frequency interference picked by the apparatus that is easily interfered by high frequencies gets short by the capacitance and can not be continuously spread, thereby reducing the high frequency interference and improving the performance of the EMC device.

Description

technical field [0001] The present invention relates to electromagnetic compatibility (Electro Magnetic Compatibility, EMC for short), and in particular to an EMC device. Background technique [0002] Electromagnetic Compatibility (EMC) refers to the ability of a device to operate satisfactorily in its electromagnetic environment without causing intolerable electromagnetic interference to any device in its environment. Therefore, EMC includes two requirements: on the one hand, it means that the electromagnetic interference generated by the equipment during normal operation cannot exceed a certain limit; on the other hand, it means that the equipment has a certain Degree of immunity, that is, electromagnetic susceptibility. Existing EMC equipment is prone to high-frequency interference from space or along the line, which affects the performance of the equipment. [0003] Switching power supply is a kind of EMC equipment that requires better EMC performance. With the continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/14H02M1/44
Inventor 朱春辉
Owner VERTIV CORP
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