A Simple and Reliable Ethernet Power Supply Device

Abstract

The invention provides a simple and reliable Ethernet power supply device which comprises a power supply end circuit and a power receiving end circuit. The power supply end circuit comprises a power supply circuit and a detection circuit. The power receiving end circuit comprises a detection resistor, a filter circuit and an overvoltage protection circuit. The power supply circuit is connected with the detection circuit. The detection circuit is connected with the detection resistor through two signal lines for detecting circuit transmission. The power supply circuit is connected with the filter circuit through two spare lines. The filter circuit is connected with the overvoltage protection circuit. Reliable Ethernet power supply can be achieved through a circuit composed of the simple discrete devices, and the simple and reliable Ethernet power supply device has the advantages of being wide in applicability, high in flexibility and low in cost.

Description

technical field [0001] The invention relates to a simple and reliable Ethernet power supply device. Background technique [0002] A complete power supply system POE includes two parts: power supply equipment (PSE, PowerSourcingEquipment) and power receiving equipment (PD, PowerDevice). The PSE device is a device that supplies power to Ethernet client devices and is also the manager of the entire POE Power over Ethernet process, while the PD device is a PSE load that receives power. The traditional Ethernet power supply system mostly uses a combination of PSE chip and PD chip. The PSE device outputs a small voltage at the port until it detects that the connection of the cable terminal is a power receiving device that supports the IEEE802.3af standard. After detecting the power receiving end device PD, the PSE device will classify the PD device and evaluate the power consumption required by the PD device. After the classification is completed, a stable and reliable 48V DC po...

AI Technical Summary

Problems solved by technology

However, in some application scenarios, such as a private system, the host A supplies power to the slave B through the network cable. If the user follows the traditional POE power supply method, the cost will be very high, because expensive PSE chips and PD chips are required. When the power supply at the power supply device does not meet the standard power-over-Ethernet voltage range requirements, additional circuits need to be added to boost or buck the voltage, which is obviously not a good design solution

Images