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Hitachi

Power Electronics

Regenerative power battery storage system (B-CHOP)

Stores power in batteries generated when trains brake; recovered power can be used when the train is under way.

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Please contact Hitachi for information about the disposal of used storage batteries Hitachi provides.

ECH series Eco rectifier

This system uses a heat pipe cooling system filled with pure water; PFCs (refrigerants), a known contributor to global warming are not used.
The system supports heaterless operation down to -20C, and facilitates greater energy efficiency and space-saving.

  • Free of substances that contribute to global warming
  • Can be used in cold climates
  • 46% reduction in installation floor area (Hitachi ratio)

PFC : Perfluorocarbon

PWM converter

Overall performance of DC electromotive systems enhanced by means of DC electromotive voltage control with PWM converter that uses IGBT.
(Used by Tsukuba Express.)

  • DC electromotive voltage contact control
  • Power factor 1 operation
  • Low harmonics

PWM : Pulse Width Modulation
IGBT : Insulated Gate Bipolar Transistor