Garage – The Necessity of 12V battery in the Automotive Industry
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Garage – The Necessity of 12V battery in the Automotive Industry

Look under the hood of an electric vehicle and you may be surprised to find a conventional 12V lead-acid battery, or an additional 48V battery. You may wonder why does an EV need a conventional battery when there’s a 400V or 800V battery already in the vehicle to power the motors? Today the 12V or 48V batteries power all the other systems in the vehicle, but they add cost and weight and take up valuable space. Why not remove the 12V battery and use the 400 – 800V battery to power everything in the car? The simple answer is that many automotive systems, especially safety systems, must respond quickly to sudden changes in power, and batteries historically have much better response times than DC-DC power converters. Until recently, power systems engineers have not had options for safely and reliably converting 800V or 400V down to 48V or even 12V with a fast transient response and without adding unwanted volume or weight.
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