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Electrical Vehicle Fast Charging

The electric vehicle market has been gaining momentum in the UK since 2012. With environmental benefits evident, the government has stepped up to meet CO2 reduction targets by banning the sale of new petrol and diesel cars by 2040.

One of the challenges facing the UK is the need for infrastructure and the development of a national charging network.

A recent study found that limited availability of charging points was the second reason drivers had not considered a battery electric vehicle when purchasing their most recent car (22%); the first reason being initial cost, by a narrow margin (32%) (Click here for source).

Consumers need the security of knowing accessible charging point locations before they purchase. A home installation would be required, charging points at places of work are a necessity, plus motorway services for lengthier journeys. Rapid charging points are also dominating the news; development of units which charge a vehicle in less than 30 minutes, combined with a charging network, will intensify the adoption of electric vehicles across the UK.

How can Roxburgh EMC support the EV charging market?
Level 3 EV charging otherwise known as DC level 2 fast charging uses a power of 50kW, 120kW or even 240kW to charge EVs to 80% in as little as 10 or 20 minutes. This DC current is generated in kerbside units that convert mains 3 phase AC to the controlled DC current needed to perform this rapid charging. These rapid charge units need to rectify the AC in the AC/DC power stage using power FET and to control the charge rate in the DC/DC stage using power FET or IGBT. These power switching stages can create radio frequency interference (RFI) and harmonics.

Where EV fast charge units are concerned international standard IEC61000-6-3 states the conducted and radiated radio frequency emissions limits whilst IEC61000-3-12 typically sets the limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16 A and ≤ 75 A per phase.

Roxburgh EMC can offer pre-compliance testing for conducted and radiated emissions as well as for harmonics offering a useful blend of test competency with problem solving skills. All equipment is calibrated and we can provide a test report. Some of our customers add our test report to their technical file as evidence of due diligence for their self-certification. Others use our service to confirm that their equipment will pass before they engage the services of a competent body. Our test engineers are also competent in design so will often create a new filter to meet with specific mounting, dimensional, performance and earth leakage constraints.

Roxburgh EMC also offer ranges of standard single phase, 3 phase and 3 phase plus neutral RFI filters along with solutions to harmonics issues such as reactors, passive harmonic filters and DC link chokes.