The charging method is a constant current – constant voltage characteristic followed by a float charging mode. The output is protected with a serial diode to avoid return currents from the capacitors. To ensure that the capacitors never become overcharged, a redundant control circuit monitors the end-of-charge voltage and switches the output off in case of high voltage.
Due to the internal fan which starts running when necessary, the unit can be used in any mounting orientation and at altitudes as high as 6000m. The unit operates from AC 230V mains, includes an electronic inrush current limitation and an active power factor correction circuit. The unparalleled high efficiency of 94.4% reduces the heat in the cabinet and achieves high MTBF figures and a long service life of the unit.
Additional features include, wide operational temperature range from -40°C to +65°C, leight weight of only 2.3kg, small size of only 310 x 154 x 80mm (LxWxH), and the capability for flange mounting allows for many types of applications. A galvanically isolated inhibit input stops the charging mode and the “Fully-Charged” and an “Output-OK” relay contacts allow a remote monitoring of the unit.
One main application for this unit is utilizing them for wind turbines. Using super-capacitors rather than batteries to control turbine pitch is a major step forward for the wind power industry and the PSA395 will play an important role in improving efficiency and reliability.