A charging station for simultaneous and accelerated charging of batteries of several electric vehicles.

Abstract

The invention relates to electric vehicle charging stations and can be used to design cost-effective and reliable chargers with accelerated charging. The closest analogue to the proposed invention is the invention under Patent No. 37128 of the Republic of Kazakhstan, dated January 10, 2025, entitled "Charging Station for Simultaneous and Accelerated Charging of Batteries of Several Vehicles" by R.M. Ilyasov. The purpose of this application is to prevent an emergency situation at the charging station when switching electric vehicle batteries to the charging station. However, the situation is such that the charging station cannot be in idle mode, and the batteries cannot be short-circuited, even for a short time. Connecting the battery to the charging station via a relay circuit cannot prevent an emergency situation during switching. This situation will either cause an unlimited increase in voltage on the CT windings and the voltage on the capacitor banks, leading to interturn short circuits in the windings and breakdown of the power source capacitors, or significant overheating of the batteries in short-circuit mode. Another goal is to limit the temperature rise in the charging system during boost charging of electric vehicles. According to IEC 62196, the temperature should not exceed 90°C. At significant charging currents (375, 250 A), this temperature may be significantly higher than recommended. A solution to the first problem is proposed as follows. The secondary windings of the three-phase current transformer are connected in a delta configuration. This will ensure that the secondary windings are permanently closed in an unbroken circuit, thereby avoiding the potential for the secondary winding to remain idle. The solution to the second problem, namely reducing the heating of batteries during accelerated charging, can be achieved by regulating the charging power, using controlled valves in the rectifier section, based on thyristors, transistors or IGBTs, which will allow changing the phase angle of switching on or off the key elements.