A power over ethernet system
A technology of power supply system and Ethernet, applied in the direction of data switching current source, advanced technology, climate sustainability, etc., can solve the problems of increasing system cost and complexity, and achieve the goal of improving reliability, reducing cost, and simplifying the peripheral structure Effect
Active Publication Date: 2022-07-12
XIDIAN UNIV
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[0004] but, figure 1 The external source circuit shown is external to the PD interface circuit. Although the PD interface circuit is in a board-level system, this part of the circuit increases the cost and complexity of the entire system.
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Embodiment 1
[0039] After the PSE detects and classifies the PD, the PSE will increase the feed voltage to provide the PD with the required power. At this time, the system goes through the power-on process. During this process, it should be noted that the system should avoid excessive inrush current from causing damage to the PD's power management chip and power devices. In addition, after the power-on process is completed, when entering the normal working mode, the working current is too large to prevent faults such as short circuit or overload, which will damage the PD's power management chip or load, that is, the system needs to monitor and limit the PD current. To this end, it is proposed as figure 1 As shown in the conventional power over Ethernet system, although the system can monitor and limit the PD current, it increases the cost and complexity of the entire power over Ethernet system.
[0040] In order to reduce the cost and complexity of the entire power over Ethernet system, a...
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The invention discloses an Ethernet power supply system, comprising a power supply device and a power receiving device connected by a cable. The power receiving device includes a PD interface circuit with a built-in MPS circuit and a hot-swap tube, and an output circuit. In the MPS circuit: sampling The conversion circuit is used to sample and convert the input signal of the PD interface circuit into a PD signal with a preset ratio; the comparison circuit is used to compare the reference signal and the PD signal to obtain control information; the pulse generation circuit is used to generate the pulse signal according to the control information; The current generation circuit is used to adaptively generate the MPS signal according to the pulse signal to adjust the input signal of the PD interface circuit according to the MPS signal and the PD signal; the output circuit is used to adjust the input signal of the PD interface circuit under the control of the hot-swap tube signal to maintain the current required to maintain power from the power sourcing device to the powered device PD. The invention realizes the MPS requirement stipulated by the IEEE802.3 standard, simplifies the peripheral structure, and reduces the system cost and power consumption.
Description
technical field [0001] The invention belongs to the technical field of power over Ethernet processing, and in particular relates to a power over Ethernet system. Background technique [0002] Power over Ethernet (PoE for short) technology is widely used in the network market due to its advantages of space saving, high flexibility and low cost. When a Power Sourcing Equipment (PSE) supplies power to a Powered Device (PD), the PSE must monitor current consumption to ensure that the PD is still connected. The minimum current that the PD must consume to avoid disconnection is called MaintainPower Signature (MPS), that is, if the PD current is lower than the minimum current, the PSE will assume that the PD has been disconnected and terminate the operating voltage. In this regard, some PDs have a low power mode or sleep mode whose power level does not meet the MPS requirements. Such PDs would need to intentionally draw higher currents to maintain power, but this completely defea...
Claims
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IPC IPC(8): H04L12/10
CPCH04L12/10Y02D30/50
Inventor 励勇远朱樟明刘术彬刘帘曦李栋
Owner XIDIAN UNIV