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A 48-volt DC electrical system voltage is a relatively low-voltage electrical system that is increasingly used in vehicles. It began in the 2010s as a way to increase the propulsion and battery recharge during braking for fuel savings in internal combustion engine vehicles, especially mild hybrid vehicles.
2016年11月6日 · It only takes about 30mA of 60Hz AC current through the heart to cause fibrillation, compared to 300-500mA of DC current. The 'let go' current (above which you cannot let go of a grasped conductor) is 4 times higher for DC than AC. So that means you need 4-17 times more DC voltage to get a fatal shock.
- frankly the difference between 48V and 120V doesn't seem to be that significant. 120V is 2.4 times higher than 48V - hardly what I would call 'not...
- 48V is the practical and LEGAL definition of the maximum voltage to be considered "low voltage" and intrinsically "safe". Certainly 48V delivered U...
- No death by electrocution going to happen. 48V is considered "safe", and that is for good reason. First, the impedance of the human body at 50V i...
- Different areas of the world differ slightly, but the 'safe' level for low voltage tends to be pitched at the 40 to 60v range, below which it is de...
- First off, some people seem to have fixated on POTS which is nothing like PoE. Props to all the telecom engineers who've had ringing current up the...
- In Europe, the maximum voltage for child toys is 24 V DC only. If applied directly over the heart at chest and back, even smaller voltages may be d...
- IEC 62368-1:2014 defines "safe" as 60VDC or 2mA DC, whichever is less. For AC the limits are 30VAC and 0.5mA. These are considered safe for an ordi...
- A couple of other answers mention 48V DC being a "safe" voltage, however I would argue that the environmental conditions (grounding, skin conductan...
- What is more important than voltage in electrical safety is current. The amount of current required to start or stop the heart is 60 mA across the...
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What is a 48 volt DC electrical system?
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2019年7月4日 · Why is a DC/DC converter necessary? While DC/DC converters can be based on a number of different designs, the underlying function remains the same. We might be talking about a step-up converter, which turns a low-voltage input into a high-voltage output, or a step-down converter, which does the opposite.
A direct current converter (DC-DC) converts the voltage from the 48-volt battery to the 12 volts required for the vehicle’s electrical system. 7. Among this system’s many benefits is its cost-effectiveness, since it can be integrated relatively easily within existing vehicle concepts.
Learn the differences between 12V, 24V and 48V Inverter Systems with this handy guide from The Inverter Store and complete your off-grid power system today.
48 V system provides a significant boost in power over 12 V. While a standard 12 V system can put out a maximum of 2 to 4 kW, the 48 V system can deliver up to 10 − 20 kW. The higher voltage does a better job at operating heavy−duty devices like pumps, compressors, turbos, and suspension components.
A core component of the 48V subsidiary electrical system is also the bidirectional DC/DC converter that connects both systems. This unit typically offers an output of 3kW with peaks of up to 3.5kW for 2s and is passively cooled to achieve efficiency of at least 96%.
