Power supply device for electromotive railcar
AssigneeKabushiki Kaisha Toshiba
InventorYOSHIHITO NOMURA
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Abstract
A power supply device for an electromotive railcar comprises a first capacitor connected to receive a DC voltage for outputting a first DC voltage, a DC/AC/DC converter, including an inverter bridge including power transistors connected to the first capacitor in parallel, an insulating transformer with high carrier frequency having a primary winding connected to an output of the inverter bridge and a rectifier circuit connected to a secondary winding of the insulating transformer to receive a second DC voltage, and a three-phase inverter including a bridge circuit of power transistors for generating a three-phase AC voltage on the basis of the second DC voltage.
Claims15
A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising:
- a first capacitor connectable to receive said external DC voltage and outputting a first DC voltage in response to the external DC voltage;
- a DC/AC/DC converter including an inverter bridge having a plurality of power transistors connected to said first capacitor in parallel, an insulating transformer with a high carrier frequency and having a primary winding connected to an output of said inverter bridge, and a rectifier circuit connected to a secondary winding of said insulating transformer to receive a second DC voltage;
- and
- a three-phase inverter including a bridge circuit having a plurality of power transistors for generating a three-phase AC voltage on the basis of said second DC voltage.
A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising:
- a series circuit of a plurality of first capacitors connected to receive said external DC voltage for outputting a first DC voltage;
- a plurality of DC/AC/DC converters, each of said DC/AC/DC converters including an inverter bridge having a plurality of power transistors respectively connected to one of said plurality of first capacitors in parallel, an insulating transformer with a high carrier frequency and having a primary winding connected to an output of said inverter bridge, and a rectifier circuit connected to a secondary winding of said insulating transformer to receive an second DC voltage;
- and
- a three-phase inverter including a bridge circuit having a plurality of power transistors for generating a three-phase AC voltage on the basis of said second DC voltage.
A power supply device for an electromotive railcar adapted to receive an external DC voltage from an external electric line, comprising;
- a first capacitor having a first terminal to receive said DC voltage and for providing a first DC voltage in response to the external DC voltage and having a second terminal;
- a DC/AC/DC converter having a pair of inputs connected in parallel to the first and second terminals of the first capacitor and having a pair of outputs for providing a second DC voltage in response to the external DC voltage;
- and
- a three-phase inverter having a pair of inputs connected in parallel to the pair of outputs of the DC/AC/DC converter and having three outputs for generating a three-phase AC voltage in response to said second DC voltage.
Dependencies are inferred from the claim text.