Patents by Inventor Kenichi Onda
Kenichi Onda 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: 6496395Abstract: A direct-current power-supply apparatus provided by the present invention comprises a switching converter for converting an input direct-current power into another direct-current power, a control circuit and an isolation means. The switching converter has a main switch device for generating a pulse voltage from the direct-current input, a synchronous-rectification circuit on the output side of the switching converter and a reverse-current-blocking switch. On the other hand, the control circuit includes a PWM formation unit for driving the main switch device, a synchronous-rectification control unit for controlling an operation to drive the synchronous-rectification circuit and a driving control unit for controlling an operation to drive the reverse-current-blocking switch. The control circuit operates by using a common electric potential appearing on the output side of the switching converter as a reference electric potential. A driving signal is applied to the main switch device through the isolation means.Type: GrantFiled: March 14, 2001Date of Patent: December 17, 2002Assignees: Hitachi Ltd., Hitachi Tohbu Semiconductor Ltd.Inventors: Norikazu Tokunaga, Kenichi Onda, Tadashi Takahashi, Takeshi Onaka, Ryohei Saga, Katsunori Hayashi
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Publication number: 20020185994Abstract: A DC-DC converter of low ripple voltages which has a bi-directional power conversion means between an input power source and a smoothing capacitor and can quickly change the output voltage independently of the load. Said DC-DC converter comprises a main circuit of a non-insulated step-down DC-DC converter comprising at least two semiconductor elements, a DC reactor, and a smoothing capacitor, means for generating a variable reference voltage, means for comparing a reference voltage generated by said reference voltage generating means by the output voltage and outputting differential voltage information, means for generating a signal to be applied to the control terminals of said semiconductor element according to said differential voltage information, and means for discriminating the direction of a current flowing through said DC reactor.Type: ApplicationFiled: January 31, 2002Publication date: December 12, 2002Applicant: Hitachi, Ltd.Inventors: Akihiko Kanouda, Kenichi Onda, Norikazu Tokunaga, Ryouhei Saga, Kyoichi Hosokawa
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Publication number: 20020186576Abstract: The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3 and a current larger than a predetermined peak cut level is discharged from the secondary battery 4 at the time of peak load. Further, when the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC-DC converter 5. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.Type: ApplicationFiled: February 27, 2002Publication date: December 12, 2002Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
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Patent number: 6489756Abstract: In a voltage drop chopper type DC-DC converter, in an intermediate load area, a pulse train having a low peak value in the neighborhood of the threshold voltage is applied to a power MOSFET, whereby the power MOSFET is given a high ON resistance and turned on. By doing so, the output voltage is controlled by a PAM (pulse amplitude modulation) switch system for reducing the peak value below the supply voltage.Type: GrantFiled: March 14, 2001Date of Patent: December 3, 2002Assignee: Hitachi, Ltd.Inventors: Akihiko Kanouda, Kenichi Onda, Norikazu Tokunaga, Ryouhei Saga
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Publication number: 20020136030Abstract: A DC-DC converter is provided with a calculation circuit which estimates current flowing through a reactor in a control circuit for controlling a switching element and a circulation use element, and the switching element and the circulation use element are controlled by making use of the calculated reactor current value. Thereby, a DC-DC converter which operates in a high efficiency and with low ripple even during a light load condition and realizes a high response performance during load variation is provided.Type: ApplicationFiled: November 30, 2001Publication date: September 26, 2002Applicant: Hitachi, Ltd.Inventors: Norikazu Tokunaga, Kenichi Onda, Takeshi Onaka, Ryouhei Saga, Akihiko Kanouda
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Publication number: 20020080631Abstract: The efficiency of the DC-DC converter that the load factor varies greatly is improved.Type: ApplicationFiled: March 14, 2001Publication date: June 27, 2002Inventors: Akihiko Kanouda, Kenichi Onda, Norikazu Tokunaga, Ryouhei Saga
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Publication number: 20020071292Abstract: A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage means which supplies electric power to the DC/DC converter through the DC converter.Type: ApplicationFiled: December 22, 1999Publication date: June 13, 2002Inventors: NOBUYUKI AIHARA, TAKESHI ONAKA, NORIKAZU TOKUNAGA, KENICHI ONDA, SATORU MASUYAMA, SHIGEKAZU ZEMBA
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Publication number: 20020067630Abstract: A DC power supply device comprises an AC/DC converter 1, a DC/DC converter 2, and a DC converter 3 converting DC power from a battery 4 to DC voltage for connecting to output terminals of the AC/DC converter. The DC power supply device is provided with a controlling circuit 100 which observes a charging control level and a load sharing level, impresses a charging command on a UPS controlling part controlling the DC converter, and simultaneously provides a PFC controlling part controlling the AC/DC converter with a current command when a voltage level is less than the charging control level, stops only the charging command when the voltage level is more than the charging level and less than the load sharing level, and provides the UPS controlling part and the PFC controlling part with current commands when the voltage level is more than the load sharing level.Type: ApplicationFiled: October 31, 2001Publication date: June 6, 2002Applicant: Hitachi, Ltd.Inventors: Norikazu Tokunaga, Kenichi Onda, Takeshi Onaka, Satoru Masuyama, Ryouhei Saga, Katsunori Hayashi
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Patent number: 6381152Abstract: A power supply apparatus includes a semiconductor switching device for outputting power and a control circuit for controlling the on/off operation of the semiconductor switching device. The control circuit includes a circuit for applying, when turning on the semiconductor switching device, a first control signal corresponding to the difference between the output voltage of the power supply apparatus and a first reference value to the semiconductor switching device in accordance with the increase in the output voltage from the power supply apparatus thereby to operate the semiconductor switching device in a non-saturated area, so that the semiconductor switching device is turned on gradually.Type: GrantFiled: August 30, 2000Date of Patent: April 30, 2002Assignees: Hitachi, Ltd., Hitachi Tohbu Semiconductor, Ltd.Inventors: Tadashi Takahashi, Kenichi Onda, Norikazu Tokunaga, Takeshi Onaka, Ryouhei Saga, Katsunori Hayashi
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Patent number: 6346532Abstract: Amide derivatives represented by general formula (I) or salts thereof wherein each symbol has the following meaning: ring B: an optionally substituted heteroaryl optionally fused with a benzene ring; X: a bond, lower alkylene or lower alkenylene optionally substituted by hydroxy or lower alkyl, carbonyl, or a group represented by —NH— (when X is lower alkylene optionally substituted by lower alkyl which may be bonded to the hydrogen atom bonded to a constituent carbon atom of ring B to form lower alkylene to thereby form a ring); A: a lower alkylene or a group represented by -(lower alkylene)—O—; R1a and R1b: the same or different and each hydrogen or lower alkyl; R2: hydrogen or halogeno; and Z: nitrogen or a group represented by ═CH—.Type: GrantFiled: April 7, 2000Date of Patent: February 12, 2002Assignee: Yamanouchi Pharmaceutical Co., Ltd.Inventors: Tatsuya Maruyama, Takayuki Suzuki, Kenichi Onda, Masahiko Hayakawa, Hiroyuki Moritomo, Tetsuya Kimizuka, Tetsuo Matsui
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Publication number: 20010026462Abstract: A direct-current power-supply apparatus provided by the present invention comprises a switching converter for converting an input direct-current power into another direct-current power, a control circuit and an isolation means. The switching converter has a main switch device for generating a pulse voltage from the direct-current input, a synchronous-rectification circuit on the output side of the switching converter and a reverse-current-blocking switch. On the other hand, the control circuit includes a PWM formation unit for driving the main switch device, a synchronous-rectification control unit for controlling an operation to drive the synchronous-rectification circuit and a driving control unit for controlling an operation to drive the reverse-current-blocking switch. The control circuit operates by using a common electric potential appearing on the output side of the switching converter as a reference electric potential. A driving signal is applied to the main switch device through the isolation means.Type: ApplicationFiled: March 14, 2001Publication date: October 4, 2001Inventors: Norikazu Tokunaga, Kenichi Onda, Tadashi Takahashi, Takeshi Onaka, Ryohei Saga, Katsunori Hayashi
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Patent number: 6177454Abstract: An amide derivative represented by the following general formula (I) or a salt thereof and a pharmaceutical composition containing the amide derivative and a pharmaceutically acceptable vehicle. The symbols in the formula have the following meanings wherein A: heteroarylene; X: bond, O, S, —NR5—, —NR5CO—, —NR5CONH—, —NR5SO2— or —NR5C(═NH)NH—; R1: —H, -optionally substituted lower alkyl, -optionally substituted aryl, -optionally substituted heteroaryl or -optionally substituted cycloalkyl; R2a, R2b: —H or -lower alkyl, which may be the same or different; R3: —H or -lower alkyl; R4a, R4b: —H or —OH, which may be the same different, or R4a and R4b are taken together to form ═O or ═N—O—lower alkyl; and R5: —H or -lower alkyl.Type: GrantFiled: February 29, 2000Date of Patent: January 23, 2001Assignee: Yamanouchi Pharmaceutical Co., Ltd.Inventors: Tatsuya Maruyama, Kenichi Onda, Masahiko Hayakawa, Takumi Takahashi, Takayuki Suzuki, Tetsuo Matsui
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Patent number: 6048884Abstract: An amide derivative represented by the following general formula (I) or a salt thereof and a pharmaceutical composition containing the amide derivative and a pharmaceutically acceptable vehicle. ##STR1## (The symbols in the formula have the following meanings. (whereinA: heteroarylene;X: bond, O, S, --NR.sup.5 --, --NR.sup.5 CO--, --NR.sup.5 CONH--, --NR.sup.5 SO.sub.2 -- or --NR.sup.5 C(.dbd.NH)NH--;R.sup.1 : --H, -optionally substituted lower alkyl, -optionally substituted aryl, -optionally substituted heteroaryl or -optionally substituted cycloalkyl;R.sup.2a, R.sup.2b : --H or -lower alkyl, which may be the same or different;R.sup.3 : --H or -lower alkyl;R.sup.4a, R.sup.4b : --H or --OH, which may be the same different, or R.sup.4a and R.sup.4b are taken together to form .dbd.O or .dbd.N.about.O-lower alkyl; andR.sup.5 : --H or -lower alkyl.Type: GrantFiled: May 7, 1999Date of Patent: April 11, 2000Assignee: Yamanouchi Pharmaceutical Co., Ltd.Inventors: Tatsuya Maruyama, Kenichi Onda, Masahiko Hayakawa, Takumi Takahashi, Takayuki Suzuki, Tetsuo Matsui
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Patent number: 6028779Abstract: In order to provide a power inverter device which can reduce surge voltages in all of the operating conditions thereof and has a simple structure, in a neutral point clamped 3 level type power inverter device formed by connecting semiconductor switching elements, diodes and smoothing use capacitors connected via plate shaped conductors, a first plate shaped conductor connects the diodes and the smoothing use capacitors and a plurality of plate shaped conductors connecting the elements are disposed over the first plate shaped conductor and separated from it by an insulating material.Type: GrantFiled: November 25, 1998Date of Patent: February 22, 2000Assignee: Hitachi, Ltd.Inventors: Kiyoshi Sakamoto, Takashi Ikimi, Kenichi Onda, Masahiro Tobise
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Patent number: 5768117Abstract: The invention relates to a power supply system having plural converters connected in parallel. The current of each of the plural converters is detected and each of the converters is controlled so as to match each of the converters to a maximum current value from among the detected current values. In the parallel converters, when one or more converter fails, having an output current of zero, the remaining converters are each partially charged equally to maintain the load current. Since a common bus is arranged between plural converters and plural loads, it is possible to carry out a redundant operation having a high reliability. Since a stable output can be obtained without being affected by the failed converter, a power supply system having the redundancy and the high reliability can be attained.Type: GrantFiled: December 27, 1994Date of Patent: June 16, 1998Assignee: Hitachi, Ltd.Inventors: Tadashi Takahashi, Kenichi Onda, Akihiko Kanouda, Masayoshi Sato, Hideaki Horie, Katsunori Hayashi
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Patent number: 5643931Abstract: A bisoxadiazolidine dione derivative represented by the following general formula (I) or a pharmaceutically acceptable salt thereof, which is useful as an insulin sensitivity-increasing drug, and a pharmaceutical composition thereof. ##STR1## each represents a phenylene groupL:(1) an oxygen,(2) a ##STR2## (3) a --S(O).sub.n --, (4) a --CO--,(5) a ##STR3## (6) an alkylene group or an alkenylene group which may respectively be interrupted with an oxygen atom and/or a sulfur atom.Type: GrantFiled: October 26, 1995Date of Patent: July 1, 1997Assignee: Yamanouchi Pharmaceutical Co., Ltd.Inventors: Kunihiro Niigata, Takumi Takahashi, Tatsuya Maruyama, Takayuki Suzuki, Kyoichi Maeno, Kenichi Onda, Toru Kontani, Osamu Noshiro, Reiko Koike, Akiyoshi Shimaya, Jun Irie
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Patent number: 5638264Abstract: A parallelized power supply system including a plurality of switching power supplies each having a circuit for limiting rush current generated when a main switch is turned on. This system can be installed in an apparatus which requires the functions such as power uninterrupted operation and live wire insertion/dismount. Each switching power supply has another power supply for driving the rush current limiter circuit and a relay circuit for supplying relay driving current and making a connection of relay contacts after a predetermined time lapse after the operation start of the switching power supply. An a.c. power is supplied via the relay contacts to each switching power supply. The relay driving time set in the rush current limiter circuit is different for each switching power supply.Type: GrantFiled: October 17, 1995Date of Patent: June 10, 1997Assignee: Hitachi, Ltd.Inventors: Katsunori Hayashi, Akihiko Kanouda, Tadashi Takahashi, Hideaki Horie, Kenichi Onda, Yasuo Abe, Masayoshi Sato
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Patent number: 5559682Abstract: A diode, a condenser and a switching element are connected to a primary winding of a flat type transformer such as a wire type transformer. A citation energy discharged during an off-condition of the switching element, namely a reset period of the transformer, is accumulated in the condenser. An output voltage is obtained from the condenser. Two system direct current voltage output can be obtained from one transformer. Since the two system direct current voltage output can be obtained from the transformer having a pair of a primary winding and a secondary winding, the volume and the weight of the transformer can be reduced and the compact and the slim of the machine apparatus being mounted can be contributed. Making the small winding ratio of the transformer, the copper loss of the transformer can be reduced. By using MOS synchronous rectification, the loss in the circuit can be reduced. It is unnecessary to select highly the switching frequency.Type: GrantFiled: January 6, 1994Date of Patent: September 24, 1996Assignee: Hitachi, Ltd.Inventors: Akihiko Kanouda, Tadashi Takahashi, Hideaki Horie, Kenichi Onda, Syuya Hagiwara
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Patent number: 5502430Abstract: A flat transformer has a coil body. The coil body is formed by winding plural insulated conductive wires. Each of the plural insulated conductive wires has a conductor having a circular shaped cross-section, and an outer peripheral portion of the conductor is coated by an insulating coating. A part of plural insulated conductive wires is used to form a primary winding and the remainder of the plural insulated conductive wires is used to form a secondary winding. A flat transformer may also have plural coil bodies. The plural coil bodies may be wound at plural stages. A part of the plural coil bodies is may be used to form a primary winding and the remainder of plural coil bodies may be used to form a secondary winding. The flat transformer can operate stably at a high frequency with a small loss.Type: GrantFiled: October 27, 1993Date of Patent: March 26, 1996Assignee: Hitachi, Ltd.Inventors: Tadashi Takahashi, Kenichi Onda, Akihiko Kanouda, Hideaki Horie, Syuya Hagiwara, Noriyuki Uchiyama, Sadamu Saito
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Patent number: 5412558Abstract: A semiconductor integrated circuit unit, suitable for the control of a motor, has an integrated structure within the same semiconductor substrate, comprising an inverter circuit, drive circuits for driving the switching elements of the inverter circuit, an internal power source circuit for supplying power to the drive circuits which drive the upper arm side of the inverter circuit, and a logical circuit for transmitting a signal to the drive circuits which drive the upper arm side of the inverter circuit.Type: GrantFiled: September 7, 1993Date of Patent: May 2, 1995Assignees: Hitachi, Ltd., Hitachi Haramachi Semiconductor, Ltd.Inventors: Naoki Sakurai, Mutsuhiro Mori, Hidetoshi Arakawa, Kenichi Onda, Hideki Miyazaki, Akihiko Kanouda