Patents by Inventor Shigeki Harada
Shigeki Harada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8232830Abstract: A highly efficient rectifier can readily replace a two-terminal diode. Its conduction losses are reduced from that of the two-terminal diode. Connected between the source and drain of a MOSFET including a parasitic diode are a micro-power converter section for boosting a conduction voltage Vds between the source and drain to a predetermined voltage, and a self-drive control section that operates based on a voltage output from the micro-power converter section. When the source and drain are conductive with each other, the micro-power converter section generates, from the conduction voltage Vds, a power source voltage for the self-drive control section, and the self-drive control section (4) continues drive control of the MOSFET.Type: GrantFiled: December 20, 2007Date of Patent: July 31, 2012Assignee: Mitsubishi Electric CorporationInventors: Miyuki Takeshita, Akihiko Iwata, Ikuro Suga, Shigeki Harada, Kenichi Kawabata, Takashi Kumagai, Kenji Fujiwara
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Publication number: 20120158245Abstract: A first DC/DC converter is connected to a higher-voltage output terminal of a rectifier by alternator wiring, a battery that supplies electric power to an on-board load is connected to the first DC/DC converter, a second DC/DC converter is connected to the higher-voltage output terminal of the rectifier by alternator wiring, and an electrical double-layer capacitor is connected to the second DC/DC converter.Type: ApplicationFiled: October 13, 2010Publication date: June 21, 2012Applicant: Mitsubishi Electric CorporationInventors: Toshiyuki Yoshizawa, Masaya Inoue, Takahiro Urakabe, Tatsuya Okuda, Yuuya Tanaka, Takayoshi Nagai, Shigeki Harada
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Patent number: 8194192Abstract: A projection display uses a light modulating device to modulate, in accordance with image data, light radiated from a light source, project the modulated light onto a screen, and display an image. The projection display separates a unit of time configuring the image data into an effective light time when the light modulating device can express the light as an image on the screen and an ineffective light time when the light modulating device cannot express the light as an image on the screen. The projection display increases the power supplied to the light source during the effective light time over the power supplied to the light source during the ineffective light time.Type: GrantFiled: June 12, 2007Date of Patent: June 5, 2012Assignee: Mitsubishi Electric CorporationInventors: Shigeki Harada, Takayoshi Nagai, Ikuro Suga, Akihiko Iwata, Yoshiteru Suzuki, Akira Okumura, Jun Someya, Kuniko Kojima
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Publication number: 20100177540Abstract: In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power from respective sources with a voltage ratio of 1:3:9 as respective inputs are connected in series. Gradational output voltage control of an output voltage is carried out using the sum of the respective generated AC voltages. Also, a solar light voltage is boosted by a chopper circuit to generate the highest voltage DC power source. When the solar light voltage exceeds a predetermined voltage, the boosting of the chopper circuit is stopped, thereby reducing power loss due to the boosting.Type: ApplicationFiled: March 2, 2010Publication date: July 15, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada, Noriyuki Matsubara, Takashi Kumagai
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Patent number: 7719865Abstract: In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power from respective sources with a voltage ratio of 1:3:9 as respective inputs are connected in series. Gradational output voltage control of an output voltage is carried out using the sum of the respective generated AC voltages. Also, a solar light voltage is boosted by a chopper circuit to generate the highest voltage DC power source. When the solar light voltage exceeds a predetermined voltage, the boosting of the chopper circuit is stopped, thereby reducing power loss due to the boosting.Type: GrantFiled: February 21, 2006Date of Patent: May 18, 2010Assignee: Mitsubishi Electric CorporationInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada, Noriyuki Matsubara, Takashi Kumagai
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Publication number: 20100073082Abstract: Provided is a highly efficient rectifier which can readily replace a two-terminal diode and whose conduction loss is reduced from that of the two-terminal diode. Connected between the source and drain of a MOSFET (2) including a parasitic diode (2a) are: a micro-power converter section (3) for boosting a conduction voltage Vds between the source and drain to a predetermined voltage; and a self-drive control section (4) that operates based on a voltage outputted from the micro-power converter section (3). When the source and drain are conductive with each other, the micro-power converter section (3) generates, from the conduction voltage Vds, a power source voltage for the self-drive control section (4), and the self-drive control section (4) continues drive control of the MOSFET (2).Type: ApplicationFiled: December 20, 2007Publication date: March 25, 2010Applicant: Mitsubishi Electric CorporationInventors: Miyuki Takeshita, Akihiko Iwata, Ikuro Suga, Shigeki Harada, Kenichi Kawabata, Takashi Kumagai, Kenji Fujiwara
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Patent number: 7602626Abstract: In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, a second inverter is connected in series to one of two terminals on the AC side of a first inverter that uses, as its DC source, a DC voltage boosted from a solar light voltage by a chopper circuit. A third inverter is connected in series to the other terminal. Then, output voltages of the second and third inverters are controlled to be equal, and an output voltage is provided by using the sum of the generated voltages of the first, second, and third inverters. Thus, a mid-point potential of the DC power source is made equivalent to an intermediate potential of the output voltage of the power conversion apparatus, that is, the mid-point potential (ground potential) of a system.Type: GrantFiled: February 21, 2006Date of Patent: October 13, 2009Assignee: Mitsubishi Electric CorporationInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada
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Patent number: 7598678Abstract: A lamp lighting apparatus includes an arc spot movement detector (5) for monitoring an DC voltage Vb which is the bus voltage of an inverter (3), and for detecting a movement of an arc spot which appears before a lamp 1 enters a state where human beings can recognize a flicker of the lamp (1), and, when the arc spot movement detector (5) detects a movement of the arc spot, controls a switch (2a) of a DCDC converter (2) so as to suppress the movement of the arc spot.Type: GrantFiled: July 26, 2006Date of Patent: October 6, 2009Assignee: Mitsubishi Electric CorporationInventors: Shigeki Harada, Taichiro Tamida, Akihiko Iwata
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Patent number: 7596008Abstract: A power conversion apparatus includes a first single-phase inverter that uses as a DC power source a first DC voltage that is boosted from a solar light voltage by a boosting chopper circuit. The first single-phase inverter is arranged between two single-phase inverters that use second DC power sources that are supplied from the first DC power source. AC sides of the respective single-phase inverters are connected in series. A power conditioner thus configured provides an output voltage using the sum of the generated voltages of the respective single-phase inverters. Chopper circuits are connected between the first DC power source and the second DC power sources, and power is supplied to the second DC power sources from the first DC power source via switching devices in the single-phase inverters.Type: GrantFiled: February 21, 2006Date of Patent: September 29, 2009Assignee: Mitsubishi Electric CorporationInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada, Hiroshi Ito, Tomoyuki Kawakami
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Patent number: 7570948Abstract: A mobile station that selects one of a plurality of base stations according to electric field strengths of signals transmitted on control channels corresponding to the plurality of base stations, and establishes first a link and then a call connection with the selected base station on a traffic channel that is assigned via a control channel corresponding to the selected base station, the mobile station including: a measuring unit for measuring an electric field strength of a signal on the traffic channel when a link operation is performed to establish the link for the traffic channel; and a judging unit for judging whether the link operation should be continued according to the measured electric field strength.Type: GrantFiled: April 21, 2005Date of Patent: August 4, 2009Assignee: Kyocera CorporationInventors: Masayuki Yoneyama, Shigeki Harada
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Publication number: 20090015071Abstract: In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, a second inverter is connected in series to one of two terminals on the AC side of a first inverter that uses, as its DC source, a DC voltage boosted from a solar light voltage by a chopper circuit. A third inverter is connected in series to the other terminal. Then, output voltages of the second and third inverters are controlled to be equal, and an output voltage is provided by using the sum of the generated voltages of the first, second, and third inverters. Thus, a mid-point potential of the DC power source is made equivalent to an intermediate potential of the output voltage of the power conversion apparatus, that is, the mid-point potential (ground potential) of a system.Type: ApplicationFiled: February 21, 2006Publication date: January 15, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada
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Patent number: 7438420Abstract: A display apparatus having a control unit which controls the light source temperature so that the temperature remains within a predetermined temperature range, a light modulation device for displaying images by receiving light emitted from the light source, and modulating the light according to the image data, and a light source controlling unit which adjusts the amount of light that enters the light modulation device, by controlling electrical power fed to the light source, according to the brightness data. Even if a contrast ratio is improved by changing the amount of light of an HID lamp, a passive optical modulation type display apparatus can be provided without reducing the lifetime of the light source lamp.Type: GrantFiled: January 31, 2007Date of Patent: October 21, 2008Assignee: Mitsubishi Electric CorporationInventors: Shigeki Harada, Taichiro Tamida, Akihiko Iwata
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Publication number: 20080192519Abstract: In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power from respective sources with a voltage ratio of 1:3:9 as respective inputs are connected in series. Gradational output voltage control of an output voltage is carried out using the sum of the respective generated AC voltages. Also, a solar light voltage is boosted by a chopper circuit to generate the highest voltage DC power source. When the solar light voltage exceeds a predetermined voltage, the boosting of the chopper circuit is stopped, thereby reducing power loss due to the boosting.Type: ApplicationFiled: February 21, 2006Publication date: August 14, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada, Noriyuki Matsubara, Takashi Kumagai
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Publication number: 20080136977Abstract: A projection display uses a light modulating device to modulate, in accordance with image data, light radiated from a light source, project the modulated light onto a screen, and display an image. The projection display separates a unit of time configuring the image data into an effective light time when the light modulating device can express the light as an image on the screen and an ineffective light time when the light modulating device cannot express the light as an image on the screen. The projection display increases the power supplied to the light source during the effective light time over the power supplied to the light source during the ineffective light time.Type: ApplicationFiled: June 12, 2007Publication date: June 12, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeki HARADA, Takayoshi Nagai, Ikuro Suga, Akihiko Iwata, Yoshiteru Suzuki, Akira Okumura, Jun Someya, Kuniko Kojima
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Publication number: 20080101101Abstract: A power conversion apparatus includes a first single-phase inverter that uses ask a DC power source a first DC voltage that is boosted from a solar light voltage by a boosting chopper circuit. The first single-phase inverter is arranged between two single-phase inverters that use second DC power sources that are supplied from the first DC power source. AC sides of the respective single-phase inverters are connected in series. A power conditioner thus configured provides an output voltage using the sum of the generated voltages of the respective single-phase inverters. Chopper circuits are connected between the first DC power source and the second DC power sources, and power is supplied to the second DC power sources from the first DC power source via switching devices in the single-phase inverters.Type: ApplicationFiled: February 21, 2006Publication date: May 1, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada, Hiroshi Ito, Tomoyuki Kawakami
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Publication number: 20070200955Abstract: A display apparatus comprises a light source temperature controlling means for controlling the light source temperature so that the temperature remains within a predetermined temperature range; a light modulation device for displaying images by receiving light emitted from the light source, and modulating the light according to the image data; and a light source ignition means for adjusting the amount of light that enters the light modulation means, by controlling electrical power fed to the light source, according to the brightness data. Even if a contrast ratio is improved by changing the amount of light of an HID lamp, a passive optical modulation type display apparatus can be provided without reducing the lifetime of the light source lamp.Type: ApplicationFiled: January 31, 2007Publication date: August 30, 2007Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeki Harada, Taichiro Tamida, Akihiko Iwata
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Publication number: 20070164685Abstract: A discharge lamp lighting apparatus includes: a DC power supply to supply power to a HID lamp; a transformer to transmit a voltage of DC power supply to the HID lamp; a switch connected between the DC power supply and a primary winding of the transformer; switches connected to a primary side of the transformer; an inductance connected in series to a secondary winding of the transformer; a series resonance circuit connected to a secondary side of the transformer and including an inductance and a capacitor; and a parallel resonance circuit connected to the secondary side of the transformer and including an inductance and a capacitor. The switches are opened or closed to intermittently supply power from the DC power source to the transformer to always supply a current to the transformer.Type: ApplicationFiled: April 6, 2005Publication date: July 19, 2007Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuji Hase, Akihiko Iwata, Shigeki Harada, Kikuo Izumi, Takashi Ohsawa
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Publication number: 20070024207Abstract: A lamp lighting apparatus includes an arc spot movement detector (5) for monitoring an DC voltage Vb which is the bus voltage of an inverter (3), and for detecting a movement of an arc spot which appears before a lamp 1 enters a state where human beings can recognize a flicker of the lamp (1), and, when the arc spot movement detector (5) detects a movement of the arc spot, controls a switch (2a) of a DCDC converter (2) so as to suppress the movement of the arc spot.Type: ApplicationFiled: July 26, 2006Publication date: February 1, 2007Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeki HARADA, Taichiro Tamida, Akihiko Iwata
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Patent number: 7164239Abstract: A discharge lamp ballast circuit is provided which can prolong the life of a discharge lamp, and reduce the size and cost of the ballast circuit. It generates from an AC voltage boosted by a DC-AC inverter circuit a DC voltage higher than the breakdown voltage of an HID lamp, or a superimposed voltage in which a pulsating component is superimposed on the DC voltage, and starts the discharge by applying the DC voltage or the superimposed voltage to the HID lamp. It can make the life of the HID lamp longer than that of the case where a high voltage short pulse is applied to the HID lamp.Type: GrantFiled: January 24, 2005Date of Patent: January 16, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigeki Harada, Kikuo Izumi, Akihiko Iwata
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Publication number: 20060222672Abstract: A gaseous constituent supply device supplies an air cannon projectile containing a predetermined gaseous constituent to an occupant in a compartment of a vehicle. This supply device includes a gaseous constituent supply chamber for reserving the gaseous constituent, an air compression unit for compressing an inside of the gaseous constituent supply chamber to generate an air cannon projectile including the gaseous constituent and to emit the air cannon projectile to an individual occupant, and a control unit that estimates an airflow state in the compartment and controls operation of the air compression means based on the estimated airflow state.Type: ApplicationFiled: March 30, 2006Publication date: October 5, 2006Applicant: DENSO CorporationInventors: Tomohisa Ezaka, Shigeki Harada, Yukiya Sassa, Manabu Maeda, Takurou Kawaguchi