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Power-off control circuit and power-off control method

A voltage control circuit and electric control technology, applied in the direction of data switching current source, data exchange details, etc., can solve problems such as power failure and application impact, and achieve the effect of reducing impact

Active Publication Date: 2021-06-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When a PSE supplies power to multiple PDs, if the current power consumption of multiple PDs exceeds the power output power of the PSE, the PSE will stop supplying power due to power overcurrent, and all the PDs connected to the PSE will be powered off. impact application

Method used

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Embodiment Construction

[0063] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "corresponding to" and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements need not be limited to the expressly listed Instead, other steps or elements not explicitly listed or inherent to the process, method, product or apparatus may be included.

[0064] In the embodiments of the present application, words such as "exemplar...

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PUM

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Abstract

According to a power-off control circuit and the power-off control method provided by the invention, the current of the PSE power supply is obtained through the current detection circuit and is converted into the voltage, and the second PSE chip is controlled through the second overcurrent comparison circuit according to the voltage, so that power-on and power-off of the PD corresponding to the second PSE chip are controlled. When the PD corresponding to the second PSE chip is powered off, the output end of the second overcurrent comparison circuit inputs a proper comparison voltage to the second input end of the first overcurrent comparison circuit through the voltage control circuit, so that the first overcurrent comparison circuit can control the first PSE chip according to the voltage, thereby controlling the power-on and power-off of the PD corresponding to the first PSE chip. Therefore, part of the PDs can be powered off firstly, the other part of the PDs are controlled to be powered on and powered off after part of the PDs are powered off, hierarchical control over power-off of the PDs is achieved, when the load changes, unimportant PDs can be controlled to be powered off firstly, important PDs are controlled finally, and influences are reduced.

Description

technical field [0001] The embodiments of the present application relate to the technical field of circuit power supply, and in particular, to a power-off control circuit and a power-off control method. Background technique [0002] With the development of modern technology, power over Ethernet (PoE) is more and more widely used, and more and more devices support PoE. These PoE-enabled devices can obtain power through PoE without the need for an external power supply. Convenience. PoE refers to the use of some terminals (such as IP phones, wireless LAN access points (access points, APs), Network camera, etc.) while transmitting data signals, it can also provide DC power supply technology for such devices. PoE is also known as power over LAN (PoL) or active Ethernet, and is sometimes simply referred to as Power over Ethernet. Wherein, a device providing power is a power sourcing equipment (PSE), and a device receiving power is a powered device (PD). [0003] When a PSE su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/10
CPCH04L12/10
Inventor 季桂荣顾超
Owner HUAWEI TECH CO LTD