Ethernet power supply filtering and safe starting device

Abstract

The invention discloses an Ethernet power supply filtering and safe starting device. The device overcomes the problems of damage to a starting capacitor, electromagnetic EMI noise and electric leakage safety certification of an Ethernet power supply network in the prior art, and comprises a filtering module, the filtering module comprises a common mode inductor and a starting module, the starting module comprises a series capacitor bank and a grounding module, the input end of the common-mode inductor is connected with the output end of the bridge rectifier, the output end of the common-mode inductor is connected with the starting module, and the grounding module is further connected with a load. The filtering module is adopted to suppress Ethernet electromagnetic EMI noise, the starting module provides a high-voltage-resistant starting capacitor bank and a combined filter, the grounding module limits leakage current and provides an internal electromagnetic EMI noise loop at the same time, the electromagnetic EMI noise in the system can be guided to flow back into the system, and the problem of electromagnetic compatibility of other systems caused by noise overflow is prevented.

Description

technical field [0001] The invention relates to the fields of hardware, electromagnetic compatibility and safety regulations, in particular to an Ethernet power supply filtering and safety starting device. Background technique [0002] PoE (Power Over Ethernet) refers to the use of IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras) without any changes to the existing Ethernet Cat. etc.) while transmitting data signals, it can also provide DC power supply technology for such devices. Ethernet is also known as local area network-based power supply system (POL, Power over LAN) or active Ethernet (Active Ethernet), sometimes referred to as Ethernet power supply, which is to use the existing standard Ethernet transmission cable to transmit data at the same time And the latest standard specification of electrical power, and maintain compatibility with existing Ethernet systems and users. A complete PoE system includes two parts: power sourcing...

AI Technical Summary

Problems solved by technology

The present invention aims to overcome the problems of multiple plugging and unplugging startup capacitor damages, electromagnetic EMI noise and leakage safety certification problems in the prior art, and provides a power-over-Ethernet filtering and safety startup device, which provides a startup capacitor At the same time guide the flow of electromagnetic EMI noise inside the system, block the external common-mode noise and fully filter the differential-mode noise, improve the withstand voltage capability of the startup capacitor, and prevent the startup capacitor from being damaged by multiple power-on.

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