Bidirectional DC/DC converter serves energy-storage systems
TDK has announced the TDK-Lambda 2,500-W EZA2500-32048 bidirectional DC/DC converter. Suitable for solar- or wind-powered energy-storage systems, this power supply can automatically, and continuously, change conversion direction from “grid side” 320 VDC nominal to “battery side” 48 VDC nominal. The EZA2500 is also designed to be used for energy recovery and is able to recycle previously wasted power from battery testers, robots, cranes, elevators, and autonomous ground vehicles.
When a 300-V to 380-V high-voltage dc source is available—for example, from solar panels during daytime—the converter can be programmed to charge 48-VDC rechargeable lithium-ion battery banks. At night the stored energy can then be converted back to high-voltage dc to power either DC/AC inverters or dc-input electrical/electronic devices.
When used as part of an energy recovery system, the previously wasted power lost due to motor braking can be used to charge batteries. That stored energy can then be used to supply peak power requirements needed during high torque conditions or as emergency standby power.
The EZA2500’s output voltage and current can be programmed or monitored using the RS-485 communications port. Several converters can be paralleled to provide additional power by programming the units into droop-mode current share via the RS-485 interface. A variety of signals and alarms are also accessible including under or overvoltage alerts or remote on-off.
The converters can operate at full power in ambient temperatures ranging from -10 to +40°C. The advanced digital control enables operating efficiencies of up to 94% to be achieved. The EZA2500 is suitable for mounting in 19” cabinets, measuring 43.6 mm (1U) high, 423 mm wide, and 400 mm deep.
The converters are fully isolated: 3 kVAC from grid-side to battery-side input/outputs, 2 kVAC from grid-side to ground, and 500 VAC from battery side to ground. The units are certified to UL/CSA 60950-1 and EN 60950-1 and carry the CE mark for the LVD and RoHS2. The EZA2500 is backed by a five-year warranty.
