As the Electrical Vehicle (EV) industry has been booming nowadays, “Charging” has been discussed a lot and the hot topic is always about how to supply electricity to these vehicles in a faster and greener way. When we look at the supply process from electricity source to EV battery, it could be easily separated into three stages which are charging station, cable, and on-board charger. In this article, we will discuss the charging concepts and the power structure.
The CFM36S series is our new cost-effective AC-DC open frame power supply that provides 36W of regulated power in the size of 3 x 1.5 inches (76.2 x 38.1 mm). It has safety approvals for IEC/UL/EN 62368-1 and meets IEC/EN60335-1 for household appliances.
Due to the advantages of Higher Voltage Direct Current (HVDC) power products, the needs from different markets have increased. The HVDC products are able to transmit more electricity and generate less power loss, save the cost and lower the weight of cable. They have been used in numerous applications with the power structure of utility power/mains plus HVDC such as 5G base station, EV charging devices, data centers, internet IT equipment, etc.
A typical power converter system of rolling stock is shown as Fig.1. The 15/25 kV energy from the catenary is stepped down by the main transformer to feed the front-end AC-DC main converter and the DC-AC motor inverter for traction motors. The output of the DC to AC auxiliary inverter is 3-phase 380 volts and is used for train lighting, the AC motors of air conditioning fans and the compressors. The 3-phase voltage is also converted to DC by the AC-DC rectifier which can provide current for battery charging. Most electrical equipment used on rolling stock is powered by the onboard battery. It depends on the geographic region and train manufacturer to determine the voltage levels of the on-board battery.