CN2831585Y

CN2831585Y - Spare power supplying device of wired TV line

Info

Publication number: CN2831585Y
Application number: CN 200520076589
Authority: CN
Inventors: 徐海洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-21
Filing date: 2005-10-21
Publication date: 2006-10-25
Anticipated expiration: 2015-10-21

Abstract

The utility model relates to a kind of catv line stand-by power supply device, is applicable to the cable TV network in rural area.Comprise transformer, common relay, outage time delay relay and thermal overload relay, the wink of outage time delay relay, moving normally closed interlock KT-a met transformer BY, transformer BY meets the heat coil FR of thermal overload relay, FR links to each other with the action contact FR-a of thermal overload relay, FR-a links to each other with the action contact FR-b of thermal overload relay and the coil KA of common relay, FR-b links to each other with the outage time-delay normally closed interlock KT-b of outage time delay relay, KT-b links to each other with the normally closed interlock KA-a of common relay and the heart yearn of cable television line, KA-a links to each other KT and common relay coil KA with the coil KT of outage time delay relay, the screen of heat coil FR and cable television line links to each other.The utility model is simple for structure, with low cost, dependable performance, in the time of realizing that the original main charger of catv line is sent a telegram here again, the standby of stand-by power supply device.

Description

Catv line stand-by power supply device

Technical field:

The utility model relates to a kind of catv line stand-by power supply device that can realize automatic switchover, is applicable to the cable TV network in rural area, is used to solve the influence of power failure to cable TV.Belong to electronic technology field.

Background technology:

The hfc plant of cable TV generally adopts star-like mode, as shown in Figure 1.Optical receiver and trunk amplifier use the 60V centrally connected power supply.Optical receiver and 60V centrally connected power supply device are placed in the center of network.In cities and towns because the resident concentrates, optical receiver with scope less.When optical receiver has a power failure, also have a power failure in the user family, do not have what influence.But in the rural area,, generally be that an optical receiver is joined in an administrative village because optical receiver institute band scope is bigger, the rural area of condition difference, an optical receiver is joined in several often administrative villages.This just brings a problem, in case the village at optical receiver place has a power failure, even there is electricity in other villages, cable TV signal also can interrupt.Therefore the user just thinks that cable TV always goes wrong, and causes harmful effect for the reputation and the fee collection of cable TV.

Solve power cut problem several schemes are arranged: increase optical node with the scope of dwindling each luminous point, UPS power supply, the power supply of 220V double copies, the power supply of 60V double copies etc.Increasing optical node is final solution, need increase calculator room equipment but increase optical node, transforms circuit, and the aspect that relates to is a lot, can not implement at short notice, and very expensive.UPS is applicable to the sub-district of opening the cable TV transmitted in both directions, so that uninterrupted power supply to be provided.But invest greatlyyer, and on the open-air circuit in rural area, also be difficult to installation and maintenance.The cable that 220V double copies power supplies will be set up is longer, needs hundreds of rice usually, and the attached cable that hangs over steel strand wire can not use common RVV for guaranteeing fail safe, use the power cable of reinforcement, and cost is also bigger.The scheme of 60V double copies power supplies also had in the past, but mostly be the power supplies in turn of active and standby two chargers, did not have active and standby branch, even main charger incoming call will be waited until also that the stand-by power supply device has a power failure could work afterwards.Because the supply power voltage of catv line is low, line loss is big, and often the voltage on the circuit is just reduced to about 50V by 60V after two or three grade of amplifier.There is the voltage gear bit switch manually to select in the amplifier.When the stand-by power supply device was powered, the virtual voltage on each amplifier was just different with the voltage gear of setting.Working under incorrect voltage to make amplifier work undesired, can damage amplifier power supply for a long time, and this just determines that the stand-by power supply device can only be odd-job, can not long-term work.Some is too complicated for some other 60V double copies charger; Some can only be used for the situation of two-way branch line; Some will be from the back panel wiring number of winning the confidence of optical receiver or amplifier, and actual being difficult to used.

Summary of the invention:

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of simple for structure, with low cost, dependable performance, in the time of realizing that the original main charger of catv line is sent a telegram here again, the catv line stand-by power supply device of stand-by power supply device automatic stand-by.

The purpose of this utility model is achieved in that a kind of catv line stand-by power supply device, it is characterized in that: comprise transformer, common relay, outage time delay relay and thermal overload relay, the live wire of the termination power line of moving normally closed interlock KT-a of the wink of described outage time delay relay, one end of another termination transformer BY input, the ground wire of another termination power line of transformer BY input, the two ends of transformer BY output link to each other with the end of incoming cables of the heat coil FR of thermal overload relay respectively, one end of the leading-out terminal of the heat coil FR of thermal overload relay links to each other with the end of the action contact FR-a of thermal overload relay, the other end of the action contact FR-a of thermal overload relay links to each other with the end of the coil KA of the action contact FR-b of thermal overload relay and common relay respectively, the other end of the action contact FR-b of thermal overload relay links to each other with the end of the outage time-delay normally closed interlock KT-b of outage time delay relay, the other end of the outage time-delay normally closed interlock KT-b of outage time delay relay links to each other with the end of the normally closed interlock KA-a of common relay and the heart yearn of cable television line respectively, the other end of the normally closed interlock KA-a of common relay links to each other with coil KT one end of outage time delay relay, the other end of the coil KT of the time delay relay that cuts off the power supply respectively with the other end of common relay coil KA, the other end of the leading-out terminal of the heat coil FR of thermal overload relay and the screen of cable television line link to each other.

The basic functional principle of stand-by power supply device of the present utility model is: when the original main charger of catv line has electricity, and the standby of stand-by power supply device; When main charger has a power failure, the power supply of stand-by power supply device; When main charger is sent a telegram here again, the standby of stand-by power supply device.

The utlity model has following advantage:

1, simple for structure, dependable performance.The stand-by power supply device is made up of a transformer and several relay, does not have complicated electronic component and circuit, can be under the relatively poor situation of line condition reliability service.Especially the rural area catv line that is struck by lightning more.

2, with low cost.Whole solution only need increase a 220V → 60V transformer and several relay, need not existing line is changed, and integrated cost is minimum in all solution power failure schemes.

3, the actual conditions that meet the catv line power supply.Because the supply power voltage of catv line is low, line loss is big, and the voltage on each amplifier is inconsistent.This situation decision can only be powered for a long time by the original main charger of catv line, and the stand-by power supply device can only odd-job.

Description of drawings:

Fig. 1 is the line map of the existing common mode of cable TV HFC network.

Fig. 2 is the circuit theory diagrams of the utility model catv line stand-by power supply device.

Embodiment:

Referring to Fig. 2, the utility model can be realized the catv line stand-by power supply device of automatic switchover, mainly is made up of 220V → 60V transformer, common relay, outage time delay relay and thermal overload relay.Wherein transformer becomes the used 60V of catv line with 220V on the power line.The live wire of the termination 220V power line of the moving normally closed interlock KT-a of wink of outage time delay relay, an end of another termination 220V → 60V transformer BY input, the ground wire of another termination 220V power line of transformer BY input.The two ends of transformer BY output link to each other with the end of incoming cables of the heat coil FR of thermal overload relay, one end of the leading-out terminal of the heat coil FR of thermal overload relay links to each other with the end of the action contact FR-a of thermal overload relay, the other end of the action contact FR-a of thermal overload relay links to each other with the end of the coil KA of the action contact FR-b of thermal overload relay and common relay respectively, the other end of the action contact FR-b of thermal overload relay links to each other with the end of the outage time-delay normally closed interlock KT-b of outage time delay relay, the other end of the outage time-delay normally closed interlock KT-b of outage time delay relay links to each other with the end of the normally closed interlock KA-a of common relay and the heart yearn of cable television line respectively, the other end of the normally closed interlock KA-a of common relay links to each other with coil KT one end of outage time delay relay, the other end of the coil KT of the time delay relay that cuts off the power supply respectively with the other end of the coil KA of common relay, the other end of the leading-out terminal of the heat coil FR of thermal overload relay and the screen of cable television line link to each other.

Divide main charger to have electricity, main charger to have a power failure below and the main charger three kinds of situations of sending a telegram here once more describe the operation principle of the utility model catv line stand-by power supply device:

1, main charger has: when main charger has electricity, have main charger Gong to come in the catv line at stand-by power supply device place.The coil KT of the normally closed interlock KA-a of common relay and outage time delay relay has electric current to pass through.When the coil KT of outage time delay relay had electricity, the outage time-delay normally closed interlock KT-b of moving normally closed interlock KT-a of the wink of outage time delay relay and outage time delay relay disconnected, and 220V → 60V transformer BY is not worked.

2, main charger has a power failure: when main charger had a power failure, not main charger Gong came in the catv line at stand-by power supply device place.The coil KT of the normally closed interlock KA-a of common relay and outage time delay relay does not have electric current to pass through.When the coil KT of outage time delay relay outage, the wink of outage time delay relay, moving normally closed interlock KT-a was closed immediately, 220V → 60V transformer BY has electricity back output 60V, at first pass through the heat coil FR of thermal overload relay, pass through the action contact FR-a (FR-a, FR-b are normally closed) of thermal overload relay again when heat coil FR is not overheated, this moment, the coil KA of common relay had electricity, and the normally closed interlock KA-a of common relay is disconnected.The 60V electricity passes through the action contact FR-b of thermal overload relay simultaneously, because the outage time-delay normally closed interlock KT-b timing closing (delay time is adjustable) of outage time delay relay, in time, the normally closed interlock KA-a of relay disconnects earlier, closed behind the outage time-delay normally closed interlock KT-b of outage time delay relay, in case the action meeting of the outage time-delay normally closed interlock KT-b of the normally closed interlock KA-a of common relay and outage time delay relay conflicts mutually.Because the normally closed interlock KA-a of common relay disconnects earlier at this moment, when the outage time-delay normally closed interlock KT-b of outage time delay relay closure, the coil KT of outage time delay relay does not have electric current to pass through.220V → 60V transformer is powered to catv line.

3, main charger is sent a telegram here once more: because main charger and stand-by power supply device be at areal, both voltage-phases can be not identical, when both voltage-phases are inequality, can clash, and electric current is increased.Even the same electrical network of main charger and ground, stand-by power supply device place, because the zero line and the live wire position opposite of the transformer inlet wire of main charger and stand-by power supply device, output 60V voltage-phase is opposite, can clash equally, and electric current is increased.When electric current increases, when surpassing the set point (set point is adjustable) of thermal overload relay, can make the heat coil FR of thermal overload relay overheated, the action contact FR-a of thermal overload relay and FR-b are disconnected, electric current is big more, moves fast more.Behind the action contact FR-a and FR-b disconnection of thermal overload relay, the coil KA of common relay cuts off the power supply, and makes the normally closed interlock KA-a closure of common relay.Because what existing main charger Gong came in the catv line at this moment, the coil KT of outage time delay relay has electric current to pass through, and the moving normally closed interlock KT-a of wink of outage time delay relay and the outage time-delay normally closed interlock KT-b of outage time delay relay are disconnected.220V → 60V transformer BY is not worked.When the heat coil FR of thermal overload relay cooling back (generally wanting a few minutes), the action contact FR-a of thermal overload relay and FR-b closure do not influence to circuit, the state when whole circuit has been got back to main charger electricity is arranged.

Claims

1, a kind of catv line stand-by power supply device, it is characterized in that: comprise transformer, common relay, outage time delay relay and thermal overload relay, the live wire of the termination power line of moving normally closed interlock KT-a of the wink of described outage time delay relay, one end of another termination transformer BY input, the ground wire of another termination power line of transformer BY input, the two ends of transformer BY output link to each other with the end of incoming cables of the heat coil FR of thermal overload relay respectively, one end of the leading-out terminal of the heat coil FR of thermal overload relay links to each other with the end of the action contact FR-a of thermal overload relay, the other end of the action contact FR-a of thermal overload relay links to each other with the end of the coil KA of the action contact FR-b of thermal overload relay and common relay respectively, the other end of the action contact FR-b of thermal overload relay links to each other with the end of the outage time-delay normally closed interlock KT-b of outage time delay relay, the other end of the outage time-delay normally closed interlock KT-b of outage time delay relay links to each other with the end of the normally closed interlock KA-a of common relay and the heart yearn of cable television line respectively, the other end of the normally closed interlock KA-a of common relay links to each other with coil KT one end of outage time delay relay, the other end of the coil KT of the time delay relay that cuts off the power supply respectively with the other end of common relay coil KA, the other end of the leading-out terminal of the heat coil FR of thermal overload relay and the screen of cable television line link to each other.