Used to supply on-board electronics equipment when the main battery is below the minimum operating voltage, the LBVS blends high voltage power conversion topologies with safety requirements and optimized power management.
“Modern equipment embedded in trains require a specific power up sequence (e.g. checking IGBT isolation, gate activation, security checks) which is done by a computer powered from an auxiliary battery. Due to some equipment or isolation breakers not always turned off, the auxiliary battery can discharge down to its safety level,” said Martin Fredmark, VP Product Management. “Without proper LBVS, it is not possible to start the train, making this unit very important for safe operation”.
the LBVS converts power from the traction-voltage line (700V to 1500V DC to an intermediate bus voltage of 110V DC and guarantees a stable voltage over a period of up to 60min and sustains a peak current specific to the application. Connected to the traction high voltage line, the LBVS complies with high safety isolation.
