Power supplier for cable television network

Abstract

The invention discloses a cable TV network power supply device which comprises a standard control circuit, a main 220 / 60V transformer, an output control circuit, a detection and interlocking control circuit, an interactive voltage detection current, a current detection circuit, a shaping and amplifying circuit, a three-phase automatic switching circuit, a three-phase sampling circuit and a time delay control circuit, wherein the three-phase automatic switching circuit is respectively connected with a three-phase power supply, the main 220 / 60V transformer and the standard control circuit, and the standard control circuit is provided with four CD4081 digital integrated circuits for finishing four logic processing functions with a gate circuit. The self-locking and mutual-locking functions of the power supply device and the self-locking and mutual-locking function in the multi-power supply combined power supply system are realized through the combination of all the unit circuits, the reliability of power supply of the cable TV network is enhanced, the invention has the functions of lightning protection and surging prevention, the volume and the cost are reduced by one half, the weight is reduced by two thirds, and the invention is the ideal the power supply device for the present cable TV network.

Description

technical field [0001] The invention relates to a power supply, in particular to a cable TV network power supply. Background technique [0002] Most of the general power supplies are single-phase power supply, the technology is simple, and the reliability of the cable TV network power supply is not good, but with the increase of the number of connected power supply phases, the safety, detectability and control technology difficulty of its work are greatly increased. It is difficult to achieve the above purpose with general electrical matching circuits and analog circuits. Dalian Tiantu Cable TV Network Co., Ltd. began to produce a "random power supply" with random interaction function in 1997. The power supply includes control safety circuit, transformer, output control circuit, self-check and mutual check, self-locking and interlocking and Short circuit protection control circuit. When using this power supply, select two or more power supply points in a certain area to co...

AI Technical Summary

Problems solved by technology

However, the power supply uses a magnetically saturated transformer, which produces large noise pollution, which is difficult for residents in the community to accept.

With the development of cable TV technology, the upgrade of power grid and the development of digital TV technology, its disadvantages are becoming more and more obvious, mainly manifested in large size, heavy weight, large noise pollution, backward technology, high cost, and can no longer adapt to modern cable TV. The needs of TV network development

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