Constant current power supplies charge energy storage systems

TDK have introduced a five-year warranty EVS series of constant current power supplies. Two power levels are offered: a fan cooled 600W and a convection cooled 300W. These compact power supplies are suitable for water purification systems or to charge batteries for energy storage. Operating from a wide-range input of 85VAC to 265VAC, the series is available with 18V (300W only), 36V and 57V outputs for charging 12V, 24V and 48V batteries, including lithium ion, nickel hydride and lead acid types. The float voltage and charging current can be user adjusted across a wide range. The units will operate in ambient temperatures of -20C to +70C with applicable derating above 45C to 60C (model dependant). Overall dimensions are 84mm x 42mm x 180mm (W x H x D), for the 300W and 120mm x 61mm x 190mm for the 600W. Options include a cover assembly (standard for the 600W) and a remote on/off function for both the 300W and 600W power levels. In addition, a 20A reverse protection module is available to avoid current flowing from the battery back into the power supply. The EVS-RP6020 is rated for operating with voltages of 7VDC to 60VDC and uses a low RDSon FET to minimise the voltage drop to less than 200mV. This module is available with or without a mounting bracket, measuring 50mm x 26mm x 77.5mm and 60mm x 32mm x 93.5mm respectively. All model numbers are safety certified to IEC/EN/UL 60950-1 with CE marking for the Low Voltage and RoHS2 Directives. The power supplies also comply with EN 55011-B and EN 55022-B emissions (both conducted and radiated) and meet the EN 61000-3-2 harmonics and IEC 61000-4 immunity standards.