Automatic switching circuit of power supply

A technology of automatic switching and power supply, applied in circuit devices, emergency power supply arrangements, protection against overcurrent, etc., can solve the problems of inability to switch between non-POE standard power supply and DC power supply, high cost, and complicated circuits. To achieve the effect of high practical value, low cost and wide application range

Inactive Publication Date: 2010-05-12
TAICANG T&W ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention patent with application number 200710186392.5 proposes a power switching device between POE power supply and local DC power supply, but the invention can only be used for switching bet

Method used

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  • Automatic switching circuit of power supply
  • Automatic switching circuit of power supply
  • Automatic switching circuit of power supply

Examples

Experimental program
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Embodiment

[0020] Example: such as figure 1 As shown, the automatic switching circuit of the power supply in this embodiment includes a first power input terminal 1 , a second power input terminal 2 , a switching module 3 and an output terminal 4 . The first power input terminal 1 is a local DC power supply input, one of which is directly connected to the output terminal 4, the other is connected to the first input terminal of the switching module 3, the second power supply input terminal is connected to the second input terminal of the switching module 3, and the switching module 3 The output is connected to the output terminal 4, and when the first power supply input terminal LOCAL_IN has an input, the switching module 3 has no output, so as to ensure the high priority of the first power supply input terminal.

[0021] In this embodiment, the second power input terminal 2 may be a standard POE power supply, a non-standard POE power supply, or other forms of power supply.

[0022] The ...

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PUM

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Abstract

The invention discloses an automatic switching circuit of a power supply, which comprises a first power input terminal, a second power input terminal, a switching module and an output terminal, wherein the first power input terminal adopts local direct current power supply input, one path thereof is directly connected with the output terminal, and the other path thereof is connected with a first input terminal of the switching module; the second power input terminal is connected with a second input terminal of the switching module, the output of the switching module is connected with the output terminal, and when input is conducted at the first power input terminal, the switching module does not have output. The priority of the output of the first power input terminal is higher than that of the second power input terminal; the automatic switching circuit is not limited to the switching selection between a local power supply and a POE power supply, and can be extended to similar occasions with the problem of switching selection of two paths of power supplies so as to realize automatic switching between two power supplies; and the automatic switching circuit is simple and practical, has low cost and high reliability, and also has the functions of power supply voltage electrifying buffering, overcurrent protection, anti-inversed connection protection, filtering, noise isolation and the like.

Description

technical field [0001] The invention relates to an automatic switching circuit of a power supply. Background technique [0002] At present, in the 48V power supply of ONU (Optical Network Unit, optical network unit) equipment in the field of GPON / EPON (Gigabit-Capable Passive Optical Network / Ethernet Passive Optical Network) optical communication access network, the more commonly used ones are local power supply and Ethernet There are two power supply methods (POE, Power over Ethernet), and most devices only use one of them. POE power supply is a technology that can provide the power required by the ONU device through the network cable in the Ethernet, so that the original network cable can not only transmit data, but also be used as a power cable. In general, devices using Power over Ethernet do not need to obtain power from the local power supply. However, in some cases, such as the power over Ethernet module of the ONU device is damaged, or for the convenience of debuggi...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02J3/01H02H3/08
CPCY02E40/40
Inventor 尹雪永
Owner TAICANG T&W ELECTRONICS CO LTD
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