PoE applications for the low-cost power isolation

This paper describes for a PoE (Power-over-Ethernet Power over Ethernet) power devices (PD-Powered Device), easy-to-use, low-cost, isolated power supply. Power over Ethernet through the existing CAT-5 Ethernet cable for Ethernet devices to provide data and power new features. PoE decision by the IEEE802.3af standard. PoE is rapidly from the manufacturers and users (such as VoIP phones, wireless access points, security cameras, sales terminals) favorite. PoE system advantages are:

Low-cost - can be eliminated wall power.

Flexible access point configuration - Wireless Access Point no longer need to configure in AC power around (or the need for AC power line through).

Remote management capabilities: IP telephony Starting capacitor and WLAN access points can be remote or electrical power. Remote Console determine how many devices need Starting capacitor power and electricity to determine which devices should be.

Higher reliability: in the end switches can be used redundant power supplies.

Global compatibility: the establishment of a common global PoE power supply connector.

In order to comply with IEEEE802.3af PoE standard, Ethernet power line device (PD) must be at the start identification, classification, control and meet the isolation requirements. By 802.3 af isolation requirements, a PD should be in the Power Interface (PI) line, the external wire rack and provides electrical isolation between. Isolation must meet IEC60950-1: 200 sub-item 6.2 of the 1500 V SELV requirements. Suliaoke installed in the VoIP telephone (no external connector or cable) could meet such a request. Achieve isolation Another way is to use the power converter transformers, it is 1500 V isolation and optically isolated output voltage locked. Electrical isolation of VoIP phones and WLAN access points is a manufacturer should carefully in terms of choice, in the hope that their desktop PC for downstream products include additional Ethernet ports.

This paper describes the isolation power to the Ethernet cable to provide PD system voltage. Power from the following components: PoE controller, EMI filters, and the second power converter isolation transformer. While this power supply is designed specifically for VoIP calls, but its features are common, and can easily be applied to other PoE applications, this power supply is the main design goals: low cost, small Starting capacitor size, high efficiency, and comply with IEEE802.3af standard

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