An
energy storage apparatus has developed for railway vehicles by adopting a bidirectional DC-
DC converter to increase the efficiency of charge /
discharge, comprising that; a power receiving unit, filter unit, charging unit storage unit having a plurality of super-capacitors,
capacitor monitoring unit, a plurality of bidirectional DC-DC
converters arranged in parallel, and
voltage detector electrically connected to the filter unit, current
detector for detecting the currents flowing. The controller further comprises; an analog interface board,
signal identifying board,
signal control board, digital output contact unit, communicating board, PWM control board, optical output board, external
gate driver. The PWM control board includes; a sensor input circuit, A / D converter, calculation unit, calculation control processor, and power monitoring unit. It is easy to add a storage unit including
supercapacitor in a form of box module for increasing capacity and efficient of charging / discharging of the storage unit through various sensors and
signal checking.