How to use and maintain the on board charger of electric vehicle ( 1 )
Safety problems of charger
The safety here mainly includes "life and property safety" and "battery safety".
There are three main aspects that directly affect the safety of life and property:
1. Safety of power supply circuit
Here I define it as a "high-power household appliance". The charging process of low-speed electric vehicles almost always uses their own places and home wires, switches, charging plugs, etc. The power of household appliances generally ranges from tens of watts to millions, the power of wall mounted air conditioner is 1200W, and the power of electric vehicle charger is between 1000w-2500w (such as 60V / 15A power 1100W and 72v30a power 2500W). Therefore, it is more appropriate to define micro electric car as a large household appliance ratio.
For the non-standard charger without PFC function, its reactive current accounts for about 45% of the total AC current), its line loss is equivalent to the electrical load of 1500w-3500w. This non-standard charger should be said to be a super power household appliance. For example, the maximum AC current of 60v30a charger is about 11a during normal charging. If there is no PFC function, the AC current is close to 20A (ampere), The AC current has seriously exceeded the current that can be carried by the 16A plug-in. It is not recommended to use this charger , which has great potential safety hazards. At present, only a few car manufacturers pursuing low price are using this kind of charger. I suggest you pay attention to it in the future and try not to distribute electric vehicles with similar configuration.
The economic level is gradually improving, and the types and power of household appliances are gradually increasing, but the power supply facilities of many families have not been optimized and improved, and still stay on the basis of a few years or even more than ten years ago. Once the power level of household appliances increases to a certain extent, it will bring catastrophic risk. The light household lines often trip or voltage drops, and the heavy ones cause fire due to serious line heating. Summer and winter are the frequent fire seasons in rural or suburban families, mostly due to the use of high-power electrical appliances, such as air conditioning and electric heating, resulting in line heating.
Post time: Sep-27-2021