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Kiyofuji; Yasuhiro
Hitachi, JP
No. of patents:

Patent Number Title Of Patent Date Issued
8255769 Control apparatus and control method August 28, 2012
A failure is detected immediately and certainly, and continuation of processing in an unstable state is prevented. A first error detection code is generated from first information which is output as a result of execution of a predetermined program conducted by a first processor. A se
7888894 Electric motor control system, series hybrid vehicle, electric motor control apparatus, and elec February 15, 2011
An electric motor control system including a generator, an AC motor, a power converter for driving the AC motor using a DC output voltage of the generator, and an electric motor controller for controlling the power converter. The electric motor controller controls the power converter by
7841434 Electric drive system for vehicle, electric control system for vehicle, electric drive method fo November 30, 2010
In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy
7643317 Power converting device and method for controlling the same January 5, 2010
In a system to which a fluctuating load is connected, compensating for fluctuation in voltage harmonics at the load connecting point and fluctuation in system current harmonics has been difficult for a power converting device connected in parallel with the load. To resolve the proble
7315144 AC drive apparatus, vehicle control apparatus, and power conversion method and vehicle control m January 1, 2008
A motor is driven with variable frequency AC power converted from DC power, and an AC output power from the motor is converted to DC. In the conversion, an electromotive force regenerated by the motor is consumed by a plurality of resistors. When the consumption of the electromotive
6839696 Guarantee charge processing method and apparatus January 4, 2005
The operation-state data of the uninterruptible power supply unit for the operation time of the uninterruptible power supply unit (UPS) deployed between the load facility and the commercial power source and used for the uninterruptible operation is provided, the guarantee charge dependen
6304468 Phase synchronization system for connecting a power converter to a power distribution system October 16, 2001
A power converter system includes: a circuit breaker having one terminal connected to a power system and another terminal connected to a load; a transformer for interconnection; a power converter; and a controller for controlling the power converter, wherein, during a return to grid

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