300-600-W Constant-current power supplies excel at charging applications

Board-style 300-W rated EVS constant-current AC-DC power supplies can operate without forced air cooling, with enclosed 600-W models having an internal cooling fan. Developed by TDK-Lambda Corp., these five-year warranty power supplies work well for charging batteries in energy storage systems, or for other applications requiring constant current outputs such as water purification or plating.

The EVS series will accept a wide 85 to 265-Vac input and has nominal 18-V (300 W only), 36-V and 57-V outputs for use with 12-V, 24-V and 48-V lithium-ion, nickel hydride and lead acid batteries. The float voltage is user adjustable down to the nominal battery voltage and the charging current can set from 50% to 100% of the rated current. Parallel operation is possible.

The units can operate in ambient temperatures ranging from -20 to 70°C with model-dependent derating. The 300W supplies measure 3.31 x 1.65 x 7.09 in. and have an optional perforated cover, with the 600 W measuring 4.72 x 2.4 x 7.48 in. A remote on/off function can also be selected on both power levels.

An external stand-alone reverse protection module is also available, preventing backflow of current into the power supply from the battery. Rated at 20 A, 7 to 60 Vdc, the EVS-RP6020 uses a low resistance MOSFET to reduce the voltage drop to less than 200 mV. This module is available as a board assembly or with a mounting bracket, measuring 1.97 x 1.02 x 3.05 in. and 2.36 x 1.26 x 3.68 in. respectively.

The power supplies have 3-kVac input-to-output, 2-kVac input-to-ground and 500-Vdc output-to-ground isolation. All are certified to UL/CSA/IEC/EN 60950-1 and carry the CE mark for the Low Voltage and RoHS2 Directives. The EVS complies with EN55011/EN55022-B conducted emissions and the IEC 61000-3-2 harmonics and IEC 61000-4 immunity standards.

Major applications
Charging batteries for energy storage systems, water purification, plating, and other applications requiring constant current operation

Main features and benefits
• User adjustable float voltage and constant current settings
• Convection and forced air models
• Five-year warranty
• Reverse current protection module