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Requirements and power system design for EV on-board charger

wallpapers News 2021-05-17
Requirements for an EV on-board charger
The main function of the EV on-board charger is to manage the current flowing from the grid to the battery. This means that the EV on-board charger must meet the grid requirements in the position it will be used in. The main requirement is not to inject reactive power into the grid, which is through a power factor (PF) of >0.9 to achieve. The EV on-board charger must also be suitable for the type of charger available, which means it must support both single-phase and three-phase operations.
It is also required to provide isolation from the power supply and the maximum current the grid can provide, which must be considered in the design. As with all power systems, there is a potential for electromagnetic interference and therefore all relevant EMC standards must be complied with. At this power level, the ability to communicate with the grid is also necessary.
Because the EV on-board charger is permanently installed, weight must be minimized to reduce its impact on the vehicle's range. Efficiency is also important, and efficiency has other benefits such as the need for less thermal management, which will reduce the size, weight, and cost of the EV on-board charger.
In the future, it may use the car as a portable energy store, harnessing the energy stored in the battery to power the home during periods of peak demand or high electricity costs. The batteries will then be replenished when electricity is cheaper. This will save homeowners money and help power companies by balancing the load on the grid. To achieve this, the EV on-board charger needs to return energy to the grid via an inverter.
The benefits of wireless charging apply to cars as well as to small, portable devices such as smartphones or tablets, especially with the addition of a single "charge" to extend the range. Since charging stations are fixed, wireless technology will be especially useful for vehicles that follow predetermined routes or often wait at specific locations. This includes buses for certain routes stopping at the same bus stop, as well as taxis waiting for a bus at a taxi stand, possibly an airport or train station.
Challenges in the design of an EV on-board charger power system
Power system design is often a constant challenge to meet the requirements of high efficiency in small spaces, especially in the case of EV on-board charger. The efficiency of the EV on-board charger is particularly important as it reduces charging time.
The more efficient the EV on-board charger is designed, the less waste heat is generated during charging, thus reducing the need for thermal management. Adding a radiator to the EV on-board charger design would increase its size and weight if necessary, but neither is desirable in the tight space of a modern car -- especially if weight reduces the overall efficiency of the car.
Regulatory compliance with EV on-board chargers is a challenge, especially when the vehicle is plugged in to charge and needs to meet the power factor rules of the grid. Typically, Boost converters are used for power factor correction (PFC), to rectify AC input, and to provide a high level of DC voltage to the DC-DC converter used to charge the battery of an electric vehicle.
Any automotive application must be designed with the vehicle's harsh environment in mind. Designers need to design designs that can cope with long periods of vibration, heat, cold, and large amounts of conductive and radiated electrical noise.
EV On-board charger supplier
Grasen EV on-board charger is mainly used for hybrid vehicles, pure electric vehicles, electric buses, electric logistics vehicles and other new energy vehicles, and is suitable for charging lithium iron phosphate, lithium manganese acid, lead acid and other vehicle power batteries. Start your EV charging station businesses with Grasen. For a no-obligation quote latest price of EV On-board charger or technical support, please contact us and fill in your details, and we’ll get back to you within 24 hours.
 
 

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