Power supply circuit for an on board energy source or storage device and particularly for super-capacitor storage unit

摘要

A Power supply circuit for an on board energy source or storage device and particularly for a super-capacitor storage unit, the said super-capacitor storage unit consisting in a plurality of super-capacitors interconnected one to the other, the said super-capacitor storage unit having a first and a second terminal the circuit comprising a positive bus connecting the first terminal of the said super-capacitor storage unit to a positive pole of a DC high voltage feeding source and a negative bus connecting the said second terminal of the super-capacitor storage unit to a negative pole of the said DC high voltage feeding source, the negative bus being connected to the ground at a certain grounding point. According to the invention the said circuit further comprises means for disconnecting the super-capacitor storage unit from the high voltage feeding source in response to the detection of fault currents circulation due to insulation losses to ground of the super-capacitor storage unit and in which power supply circuit the said means for disconnecting the super capacitor storage unit from the high voltage feeding source consist in a high speed circuit breaker and a differential relay which are connected in series along the negative bus, between said second terminal and the said grounding point, the differential relay being capable of generating an activation signal of the high speed circuit breaker in response to a fault current circulation.