A transformer (2) steps down an input AC power, and supplies the AC power to a converter (3). The primary voltage of the transformer (2) detected by a voltage detector (8) is supplied to a converter controller (4) and a frequency detector (6) via a BPF (5)...

A transformer includes an iron core (61) having a plurality of legs, a plurality of high-voltage side coils each wound around one of the plurality of legs, and a plurality of low-voltage side coils provided in correspondence with the high-voltage side coil...

Electromagnetic noises that accompany the operation of a converter device are decreased in the case where a railroad vehicle runs in the vicinity of a stopping station. If the speed of the vehicle becomes equal to or less than a first reference speed, the ...

A transformer (50) includes a core (10), a primary winding (3) wound about the core (10), a secondary winding (4) wound about the core (10) in parallel with the primary winding (3), and a differential winding (5) wound about the core (10) and connected in ...

The circuit device (60) has direct current (DC)-side power converter (61) that is configured such that bi-directional power flow is enabled between direct current (DC) link capacitor and memory device. A direct voltage side of DC-side power converter is co...

A method for providing an electric synchronous machine (2) with a resolver in a state able to deliver information about the instantaneous position of a rotor (12) of the machine with respect to a stator (9) of the machine to be used for controlling exchang...