Power source conversion circuit and network camera with same

A network camera and power switching technology, applied in the direction of data exchange network, data switching current source, electrical components, etc., can solve the problems of POE circuit error output, continuous restart, etc., to improve reliability, reduce construction cost, and flexible application Effect

Active Publication Date: 2012-06-13
QINGDAO HISENSE TRANS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing POE power supply and 24V AC power supply exist at the same time,

Method used

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  • Power source conversion circuit and network camera with same
  • Power source conversion circuit and network camera with same
  • Power source conversion circuit and network camera with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one, with reference to Figure 1-Figure 3 , the first power supply in this embodiment is a 24V power supply, the second power supply is a POE power supply, and the POE power supply circuit refers to figure 1 , the power supply process is as follows: At the beginning, the PSE device outputs a small voltage on the port until it detects that the connection of the cable terminal is a power receiving device that supports the IEEE 802.3af standard. After detecting the power receiving device PD , the PSE device may classify the PD device and evaluate the power loss required by the PD device. The standard Category 5 network cable has four pairs of twisted pairs, but only one of them is used in l0M BASE-T and 100M BASE-T When using the free pins for power supply, the 4 and 5 pins are connected to the positive pole, and the 7 and 8 pins are connected to the negative pole. A rectifier bridge rectifies the power supply to the idle pin and the data pin respectively to en...

Embodiment 2

[0022] Embodiment 2. This embodiment proposes a network camera. The power switching circuit of the embodiment is installed at the front end of the power supply in the network camera to provide power input for other systems in the camera. The power switching system includes a power supply circuit connected in sequence with the 24V Diode D25, reverse diode V19 and current limiting resistor R11, diode D25, reverse diode V19 and current limiting resistor R111 form a current limiting protection circuit, the other end of the current limiting protection circuit is connected to the first input end of optocoupler PS2801-1 , the second input terminal of the optocoupler PS2801-1 is grounded, the first output terminal is connected to the enable terminal of the POE power supply, and the second output terminal is connected to the POE reference ground terminal POE_N48V through a pull-down resistor R107.

[0023] When the IP camera is running, the 24V AC power supply V1 is preferred. At this t...

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PUM

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Abstract

The invention provides a power source conversion circuit and a network camera with the same. When POE (power over ethernet) power supply and 24 V alternative current power supply exist simultaneously, a system preferentially chooses the 24 V alternative current power supply, and when the 24 V alternative current power supply suddenly is in outage, the system seamlessly switches to the POE power supply, thereby solving the problem that the POE circuit is repeatedly restarted when error output is detected. A duplicate power source function in the network camera is realized, and the application of the network camera is more flexible, thereby reducing security project construction cost, and improving the reliability of the system.

Description

technical field [0001] The present invention relates to a power switching circuit, in particular, to switching between POE power supply and 24V AC power supply circuit. Background technique [0002] POE (Power Over Ethernet) refers to the connection between some IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras) without any changes to the existing Ethernet Cat.5 cabling infrastructure. etc.) while transmitting data signals, it can also provide DC power supply technology for such devices. POE technology can guarantee the normal operation of the existing network while ensuring the security of the existing structured wiring, and minimize the cost. A complete POE system includes two parts: the power supply equipment (PSE, Power Sourcing Equipment) and the power receiving equipment (PD, Powered Device). The manager of the process; and the PD device is the PSE load receiving power supply, that is, the client device of the POE system. During t...

Claims

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Application Information

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IPC IPC(8): H04L12/10H04L12/24
Inventor 隋守鑫刘新李月高郑金山王臣付元峰
Owner QINGDAO HISENSE TRANS TECH
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