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ADVERTIISEMENT FEAT RE FEA ATURE


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COVER STORY


Advanced relay switching for electric car battery charging systems


Richard Thornton,RichardThornton, managing director atPanasonic ElectricWorWo ksUKexplores the adva capabilities of the latest rela switchin solution for electric car battery


ca litie th latest relay switching solution for electric car battery chargin system its uniqueHE-S re


naging director at Panasonic Electric Works UK explores the advanced ry charging systems


vanced relaywithfeedback contact) is


designedfor use incharging stations inthe public andmost import


capacities of upto22kW inso-calledwall boxes


require kWand43kW, onthe


rtantly thepriva withcharging kW


basis of the technical characteristics re


res of85°. Ev


mentionedpreviously.All the relayshandle the describedre


re enm ts, especially for carry charging current doesn´tneedtobe de-rated.


rewhenusedoutdoors the ra


-S RELA AC 5ARATIING


THE DOUBLE-P LE CONTACTTAC


first re


DOUBLE-POLE HE-S ACT WITH A 35A RAT


E-SRELAY EACH AY - EACH ITHA35A RAT


TheHE-S relay isnot only small insize at a mere


components. The arm re systemnot only operates the two loadcontactswithcontact ga


gaps exceeding 3mmbut it also operates a separa


T


place of use quiet efficient andeminently suitable inawide range How ver re


, ge of tra oweve recharging at re very


the vehiclehome is a require batterieshave


rastructure regular interv rement since


he electric vehiclehas longbeenmutedas the ideal roadtra ,


ransport rt, zero emissionat ransport designs.


whencomparedwithother forms of vehicle pow ava ve


ve a very limitedtravel distance re


ower systems.As such, anextensive and vailable infra


re for re vehicle batteries is require ge


summarisedas sw of the control and


protectionbox canbe switching, RC RCDdetection, and


pilot communicationbetweenthe vehicle and the contro


rvals outside manufacturers equiptheir carswithan appropriate charging cableupto 32A. This is carriedinthe ve a re


rol box. For this purpose the vehicle re


ve recharge recharging electric


to really succeed.Basedonthe currentGerman plans intheUKaloneithasbeenenvisagedthat this shouldmeanthat,by2020, at least7,000 highpow pow


redfor electromobility re


ower chargingpointsand28,000normal ower chargingpoints shouldbeinstalled. At this time cable charging systems are enjoying themost attentionandtherefore most re make


re nj re re are


readily available. StandardIEC61851-1 kes adistinctionbetweenchargingmodes onthe basis of their installationandsystem components.What they allhave incommonis that they re


require romthe ve this occurs inthepow ge betweenthe re a switchingdevice to connect


anddisconnect the electricity supply systemto andfro


charging stationandthe ve of a faultmode trigge maybepre


bymeans of theRCDfunctionandtriggering of the isolationmonitoringdevice. Where


resent if a leakage RC


re the contro rol andpro rotective vehicle or inthe eve ger. Sucha faultmode


vehicle. Innormal chargingmode ower upstage


kage current is detected ge


ve functionis integratedinthe cable the essential functions 14 14 DECEMBER JANUAR 201 ECEMBER/JANUARY 2017 | ELEC ELECTRONICS


regularhouseholdoutlet orCEE-socke ge the battery. ower re


Ineffect apow vantage


 Highpow ows:


implement the iso andits adva follow


 Best curre


vehicle, andcanbe connectedto ket to


lationswitching function relay is the idealway to


ges canbe summarisedas ower density resulting fromhigh re


switching capacity ina compact size ry


ra


aidof contact re  Efficiency-low to 300mW


ow


rent-carrying characteristicswiththe resistances below3mΩ owestholdingpow


ower-170mW


 Insulationcapacity-clearance andcreepage distances >8mmbetweencoil andcontact sets


ge  Galvanic isolationof the loadcirc The ability of anelectro rcuit and


betweenthe control circuit andloadcircuit itself


rc


vent withstandhighvotagel ge spike circ


ov ga ge


rcuit andloadcircuit of over 10kV inrushcurrent capacity against curre


TheHEproduct family fromPanasonic (with


rcuit design. ro


romechanical relay to kes betweencontrol kValongwith rent spikes


<250Acausedby the filter systeminthe car charger is also of great value inbattery charging circ


Figure 1: Figure 1:


The HE-S relay is the ntegrated mirror


he HE-S relay is the firstfirst relay with anrelay with an iintegrated mirror feedback contact mechanism without external components


feedback contact mechanism without external components


contacts the signal contact re rtifiedformirro


re 36x30x40(L xWxH) but it is also the relaywithanintegratedmirror feedback contactmechanismwithout external ature


opening of at least0.5mm. This configuration is cert accord


ror contacts by theVDE in Thecurre ra


rdancewithIEC60947-4-1. ry


and90AintheHE-PVre hav


ratingpow of


avingcontactswith3 mgap.TheHE-PV operatewithaholdingcoilvo thenominal coilopera n vo opera


geof


use.Thera geof very


of rs alongs


ower ofapproximately300mWin rangeofhighcu rerrentcarry


rati gvoltage ro


ox


inaverysmallspacewithhighlyeff off


reliability. automotive


ryingcontacts fficientcoils


ffers thedesigner themaximumflexibility gsidethehighest re Electric drive is rev


evolutionising the vemarket andis featuring some


particularly interesting systemswithregard electric propulsion, battery systems andtheir associatedcharging systems. Expectations are highthat the existing systems andcharging technologieswill continue tobe developed, especiallywithregard


regardto ve regardto global proj ro rt ojects upto


2030and2050for further reducing theCO2 emissions of the transport sector. Thiswill significantly re


combustionengines Panasonic is alre making its positionclearwithadvancedre designs support qualitybattery


reduce theproportionof .


rting the ry charging systems. Panasonic Electric Works UK


www.panasonic-electric-works.com/uk T: 01908 231555


www.panasonic-electric-works.com/uk / ELECTRONICS ELECTRONICS ready


designof thehighest relay


rentcarryingcapacityis raisedto48A PVrelaythe90Aversionalso m ga


ra ve PVcan


voltageof just40%of ge.Thisallow


owsan


raten/c signal contact.Withweldedmain retains a contact ra


rying


thehighcharging currents for severalhours at ambient temperature sunlight exposure


Evenfor dire rect vate sector,


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