1
Fumiya Kimura, Hirofumi Nakata, Tsukasa Takebayashi, Hirokazu Kodama, Kiyoshi Nishida: Solar generation system. Sharp Kabushiki Kaisha, September 10, 2002: US06448489 (172 worldwide citation)

A solar generation system includes a standard solar cell string and a substandard solar cell string. A DC voltage output from the substandard solar cell string is boosted by a booster unit to the level of the DC voltage output from the standard solar cell string, and the DC voltage from the standard ...


2
Hirofumi Nakata, Hirokazu Kodama, Masaki Eguchi, Tsukasa Takebayashi: Inverter control method and inverter apparatus using the method. Sharp Kabushiki Kaisha, February 17, 1998: US05719758 (75 worldwide citation)

A pulse width of a pulse train signal used for PWM (pulse width modulation) control is monitored. When a variation of the pulse width substantially disappears within a specified time, it is determined that an operating point on an output characteristic curve of a photovoltaic array is located on the ...


3
Hirofumi Nakata, Hirokazu Kodama, Tsukasa Takebayashi, Satoru Fujii, Kozo Hiyoshi: Method and apparatus for controlling a DC to AC inverter system by a plurality of pulse-width modulated pulse trains. Sharp Kabushiki Kaisha, April 29, 1997: US05625539 (73 worldwide citation)

A pulse train pulse-width modulated by PWM control using a sine-wave signal and a carrier signal is inverted alternately in positive-negative polarity. With a high-frequency AC signal obtained by the inversion, a primary side of a transformer for insulating input and output from each other is excite ...


4
Takeshi Suga, Masao Watanabe, Akihito Mori, Hirokazu Kodama: Sheet conveying apparatus. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, May 9, 2000: US06059285 (59 worldwide citation)

The present invention provides a sheet conveying apparatus, and an image reading apparatus and an image forming apparatus having such a sheet conveying apparatus, in which skew correction of a sheet can be effected with high accuracy. A sheet convey means is provided at an upstream side of a skew co ...


5
Mitsuo Okamoto, Hirokazu Kodama, Tsukasa Takebayashi, Kouji Minamino, Yoshikazu Tsuyuguchi, Shigeru Ohmori: Electric power supply system. Sharp Kabushiki Kaisha, The Kansai Electric Power Co, February 20, 1996: US05493155 (44 worldwide citation)

This electric power supply system includes an air conditioner serving as load, a solar photovoltaic cell for supplying power to the air conditioner, and a system power control circuit and further including a commercial power source for use in combination with the solar photovoltaic cell for supplyin ...


6
Masaki Eguchi, Hirokazu Kodama, Tsukasa Takebayashi, Hirofumi Nakata: Inverter apparatus islanding operation detecting method and inverter apparatus capable of surely detecting an islanding operation with a simple construction. Sharp Kabushiki Kaisha, January 9, 2001: US06172889 (25 worldwide citation)

There is provided an inverter apparatus islanding operation detecting method capable of surely detecting an islanding operation with a simple construction. A distortion for causing a variation in an output frequency of an inverter apparatus in an islanding operation stage is applied to an inverter o ...


7
Mitsuo Okamoto, Hirokazu Kodama, Kouji Minamino: Driving circuit for inverter microwave oven. Sharp Kabushiki Kaisha, January 19, 1993: US05181160 (16 worldwide citation)

A driving circuit for an inverter microwave oven which includes a push-pull voltage type inverter circuit having two sets of switching element groups each provided with more than two switching elements connected in parallel to each other for switching the D.C. current supplied from a D.C. power sour ...


8
Tatsuhito Kataoka, Hirokazu Kodama: Image forming apparatus. Canon Kabushiki Kaisha, Cowan Liebowitz & Latman P C, August 16, 2005: US06930786 (11 worldwide citation)

An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; ...


9
Masaki Eguchi, Hirokazu Kodama, Tsukasa Takebayashi, Hirofumi Nakata: Inverter control method and inverter control device performing feedback control by suppressing delay. Sharp Kabushiki Kaisha, David G Colin, William J Daley Jr, September 16, 1997: US05668713 (11 worldwide citation)

In a method of controlling an inverter for adjusting a periodic inverter output waveform to a desired periodic waveform, an error waveform pattern between an inverter output waveform of the present prescribed period and a desired periodic waveform generated in synchronization with the prescribed per ...


10
Masaki Eguchi, Hirokazu Kodama, Tsukasa Takebayashi, Hirofumi Nakata: Device and method for controlling inverter performing feedback control to suppress periodic component and unsteady component of error. Sharp Kabushiki Kaisha, David G Conlin, William J Daley Jr, June 22, 1999: US05914866 (10 worldwide citation)

An inverter-control device includes a subtractor for detecting an error between a waveform of a reference current signal generated in synchronization with a waveform of an inverter output current signal and the inverter output current signal, a delay portion for delaying by a prescribed time period ...