Ethernet power supply circuit applied to network monitoring equipment

Abstract

The invention discloses an Ethernet power supply circuit applied to network monitoring equipment. The Ethernet power supply circuit comprises a proportional plus derivative (PD) controller, a DC (direct current)-DC controller, a power switch field effect transistor (FET) tube, a transformer, a rectifying circuit and a voltage detection circuit; an inner metal-oxide semiconductor field effect transistor (MOSFET) tube is arranged in the PD controller; the DC-DC controller, the power switch FET tube and the transformer are sequentially connected to form a DC-DC converter; the rectifying circuit is in feedback connection with the DC-DC controller through the voltage detection circuit; an outer MOSFET tube is connected in parallel with the inner MOSFET tube in the PD controller, and is connected with a level switching circuit; and the PD controller is connected to the level switching circuit. The current through capacity between control input ground (GND) and the ground (GND) of the level switching circuit is improved, and power for the PD controller is saved by 80 percent, so that the PD controller cannot be damaged due to overheat, and the maximum power which can be output by the circuit is improved further.

Description

technical field [0001] The invention relates to the technical field of network monitoring, in particular to a highly stable and highly integrated Ethernet power supply circuit applied to network monitoring equipment. Background technique [0002] Power over Ethernet (referred to as POE) technology is a practical and efficient power transmission method that allows IP network devices to be powered by a POE switch and transmit IP data through the same cable without having to deploy cables to provide power. It simplifies the installation of network surveillance products, reduces the cost of installation and maintenance, and improves the stability of IP video surveillance system - along with this advantage, POE network surveillance products have officially entered the security stage and received strong attention from the market. [0003] With the continuous expansion of the market of network monitoring products and the continuous updating of technology, users can no longer be sat...

AI Technical Summary

Problems solved by technology

These factors have greatly hindered the development of network monitoring products, and cannot fully realize high reliability, high integration, intelligence, automation and low cost, giving criminals an opportunity to take advantage of, so there is an urgent need for research and development to form A set of high-reliability, high-integration, automation, and low-cost high-power Ethernet power supply circuit

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