Power over Ehernet system, control circuit and control method

A power supply system and Ethernet technology, applied in the electronic field, can solve problems such as circuit damage, current reinjection, and switch tube Q1 not being disconnected

Active Publication Date: 2016-10-12
HANGZHOU SILAN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the above-mentioned power supply mode, due to the simple switching control method of the switch tube Q1, there may be a problem that the switch tube Q1 cannot be disconnected due to the abnormal voltage of the power adapter APD. As a result, the power supply equipment PSE and the power adapter APD A path will be created such that current re-feeds between the two, causing damage to the circuit

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  • Power over Ehernet system, control circuit and control method
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  • Power over Ehernet system, control circuit and control method

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[0036] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown.

[0037] In the following, many specific details of the present invention are described, such as device structures, materials, dimensions, processing techniques and techniques, for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0038] The inventor noticed that in the Power over Ethernet system, if the power adapter is expected to supply power at the same time, the Power over Ethernet system needs to solve the following problem: When the power supply equipment voltage V PSE with the first supply voltage V APD When...

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Abstract

The present invention provides a power over Ehernet system, a control circuit and a control method. The power over Ehernet system comprises: a power adapter, a first power supply voltage being provided between the positive electrode end and the negative electrode end of the power adapter; power sourcing equipment, a second power supply voltage being provided between the positive electrode end and the negative electrode end of the power sourcing equipment; a terminal device, one of the first power supply voltage and the second power supply voltage being received between the power source end and the grounding end of the terminal device as a power source voltage; and a control circuit which is used for disconnecting the power sourcing equipment when the power adapter meets power supply demands, and connecting the power sourcing equipment when the power adapter is disconnected or under voltage. The power over Ehernet system detects the voltage of the power adapter, and converts same into a switch control signal taking the reference ground of the second power supply voltage as reference ground, thereby controlling the switching between the power sourcing equipment and the power adapter.

Description

technical field [0001] The invention belongs to the field of electronic technology, and more specifically relates to an Ethernet power supply system, a control circuit and a control method. Background technique [0002] Power over Ethernet (POE, Power over Ehernet) technology refers to the technology of providing DC power supply for some network terminal devices through network cables based on the existing Ethernet wiring infrastructure. In the Ethernet power supply technology, the network cable has the functions of transmitting data signals and DC power supply. This technology eliminates the need for terminal equipment to rely on external power adapters for power supply, thereby saving power adapters, power cables and plugs, and saving wiring and hardware costs. Power over Ethernet has been widely used in VoIP phones, wireless APs, video surveillance and other fields. [0003] In many applications, users hope that terminal equipment can be powered by Ethernet or by a sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/10
CPCH04L12/10Y02D30/50
Inventor 王晨阳宁志华
Owner HANGZHOU SILAN MICROELECTRONICS
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