Patents by Inventor Akeyuki Komatsu

Akeyuki Komatsu 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).

  • Publication number: 20180375422
    Abstract: A power supply device has a switch and a coil connected in series with alternating-current input power. A first rectifier connected across the coil performs boost rectification, and a voltage across an output smoothing capacitor is charged to obtain output power.
    Type: Application
    Filed: June 22, 2018
    Publication date: December 27, 2018
    Inventors: Kyoji Marumoto, Akeyuki Komatsu
  • Patent number: 9985627
    Abstract: A drive circuit includes a control circuit configured to output a polarity signal for controlling ON/OFF of a driving switch, a pulse transformer, electrically connected to the control circuit, configured to transmit the polarity signal, and a discharge circuit, electrically connected to the pulse transformer and a gate terminal of the driving switch, configured to discharge an electric charge accumulated in the gate terminal based on the polarity signal. When the polarity signal having a first polarity is applied to the gate terminal through the pulse transformer, the driving switch is switched to and maintained in an ON state by accumulating the electric charge in the gate terminal. When the polarity signal having a second polarity different from the first polarity is applied to the discharge circuit through the pulse transformer, the driving switch is switched to an OFF state by discharging the electric charge by the discharge circuit.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 29, 2018
    Assignee: Rohm Co., Ltd.
    Inventors: Hiroyuki Hatano, Akeyuki Komatsu
  • Publication number: 20170005652
    Abstract: A drive circuit includes a control circuit configured to output a polarity signal for controlling ON/OFF of a driving switch, a pulse transformer, electrically connected to the control circuit, configured to transmit the polarity signal, and a discharge circuit, electrically connected to the pulse transformer and a gate terminal of the driving switch, configured to discharge an electric charge accumulated in the gate terminal based on the polarity signal. When the polarity signal having a first polarity is applied to the gate terminal through the pulse transformer, the driving switch is switched to and maintained in an ON state by accumulating the electric charge in the gate terminal. When the polarity signal having a second polarity different from the first polarity is applied to the discharge circuit through the pulse transformer, the driving switch is switched to an OFF state by discharging the electric charge by the discharge circuit.
    Type: Application
    Filed: June 30, 2016
    Publication date: January 5, 2017
    Inventors: Hiroyuki Hatano, Akeyuki Komatsu
  • Patent number: 8582268
    Abstract: An open magnetic circuit coil (6) is arranged on a line connecting a battery (1) to a charger (CH1). Furthermore, a resistor (2) is connected in series with a large-capacitance electrolytic capacitor (7) for smoothing a charger output which is connected to the output of the charger (CH1). This can suppress an abrupt change in current flowing in the connection line between the battery (1) and the charger (CH1) in connection between plugs (3a, 3b).
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: November 12, 2013
    Assignee: Panasonic Corporation
    Inventors: Yudai Yamamoto, Akeyuki Komatsu
  • Patent number: 8456879
    Abstract: Provided is a switching power supply apparatus capable of suppressing heat generation from a power supply to improve the efficiency of conversion during a power supply operation and accurately detecting only a current flowing through a load to achieve more stabile control. Since a first closed loop made up of a fourth diode (27d), a third inductor (25c) and a fourth electronic switch (24d) and a second closed loop made up of a second diode (27b), a first inductor (25a) and a second electronic switch (24b) do not include a fourth inductor (25d) and a second inductor (25b) through which an AC output current supplied to a load (28) flows, an unnecessary current does not flow through the first or second closed loop.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: June 4, 2013
    Assignee: Panasonic Corporation
    Inventors: Eiji Miyake, Akeyuki Komatsu
  • Patent number: 8351230
    Abstract: A plurality of power supply circuits Z1? are provided according to a load capacity. The power supply circuits Z1? have sides connected in parallel on the side of a direct current input Vi and have sides connected in series on the sides of alternating current outputs Ao. A rectifying circuit DC1 is connected via a resonance circuit Z2 across a combined output of the serially connected sides of the power supply circuits Z1? on the sides of the alternating current outputs Ao. Switching frequencies are simultaneously controlled by a single control signal outputted from a control circuit S1 based on a direct current output voltage detected from the rectifying circuit DC1 through a detection resistor R5.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: January 8, 2013
    Assignee: Panasonic Corporation
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Patent number: 8059431
    Abstract: An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a load current value detected by detection resistors R7 and R8 is compared with a reference voltage by an input-side transistor Q4 and an output-side transistor Q3 which compose a first current mirror circuit 14, so that it is possible to determine whether an overcurrent occurs or not. Moreover, a current passing through the output circuit of the transistor Q3 is temperature-compensated by a second current mirror circuit 17 made up of transistors Q6 and Q5.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: November 15, 2011
    Assignee: Panasonic Corporation
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Publication number: 20110069422
    Abstract: An open magnetic circuit coil (6) is arranged on a line connecting a battery (1) to a charger (CH1). Furthermore, a resistor (2) is connected in series with a large-capacitance electrolytic capacitor (7) for smoothing a charger output which is connected to the output of the charger (CH1). This can suppress an abrupt change in current flowing in the connection line between the battery (1) and the charger (CH1) in connection between plugs (3a, 3b).
    Type: Application
    Filed: April 16, 2009
    Publication date: March 24, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Yudai Yamamoto, Akeyuki Komatsu
  • Publication number: 20110019448
    Abstract: Provided is a switching power supply apparatus capable of suppressing heat generation from a power supply to improve the efficiency of conversion during a power supply operation and accurately detecting only a current flowing through a load to achieve more stabile control. Since a first closed loop made up of a fourth diode (27d), a third inductor (25c) and a fourth electronic switch (24d) and a second closed loop made up of a second diode (27b), a first inductor (25a) and a second electronic switch (24b) do not include a fourth inductor (25d) and a second inductor (25b) through which an AC output current supplied to a load (28) flows, an unnecessary current does not flow through the first or second closed loop.
    Type: Application
    Filed: April 7, 2009
    Publication date: January 27, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Eiji Miyake, Akeyuki Komatsu
  • Publication number: 20100182805
    Abstract: A plurality of power supply circuits Z1? are provided according to a load capacity. The power supply circuits Z1? have sides connected in parallel on the side of a direct current input Vi and have sides connected in series on the sides of alternating current outputs Ao. A rectifying circuit DC1 is connected via a resonance circuit Z2 across a combined output of the serially connected sides of the power supply circuits Z1? on the sides of the alternating current outputs Ao. Switching frequencies are simultaneously controlled by a single control signal outputted from a control circuit S1 based on a direct current output voltage detected from the rectifying circuit DC1 through a detection resistor R5.
    Type: Application
    Filed: June 25, 2008
    Publication date: July 22, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Publication number: 20100149837
    Abstract: An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a load current value detected by detection resistors R7 and R8 is compared with a reference voltage by an input-side transistor Q4 and an output-side transistor Q3 which compose a first current mirror circuit 14, so that it is possible to determine whether an overcurrent occurs or not. Moreover, a current passing through the output circuit of the transistor Q3 is temperature-compensated by a second current mirror circuit 17 made up of transistors Q6 and Q5.
    Type: Application
    Filed: May 19, 2008
    Publication date: June 17, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Patent number: 7545103
    Abstract: A cold-cathode tube lighting device uniformly lights multiple cold-cathode tubes using a common power source, and the cold-cathode tube lighting device is effectively downsized by using ballast capacitors. A substrate is divided into blocks as many as the cold-cathode tubes. Each of the blocks includes two conductor layers each including two foils. A first foil of a first conductor layer is connected to a common low-impedance power supply. Between the two conductor layers, first ballast capacitors are formed in areas where the first foils are overlapped, second ballast capacitors are formed in areas where the first and second foils are overlapped, and the third ballast capacitors are formed in areas where the second foils are overlapped. Second foils are connected to first electrodes of the cold-cathode tubes.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: June 9, 2009
    Assignee: Panasonic Corporation
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka, Toshio Manabe
  • Patent number: 7446512
    Abstract: For the purpose of providing a resonant switching power supply device having a wide output voltage variable range by changing its switching frequency, the resonance circuit thereof comprises a switching transformer, a first resonance section connected in series with the switching transformer, and a second resonance section connected in parallel with the switching transformer, wherein the resonance frequency characteristic in the case that the DC load current is large is formed using the series-connected devices of the first resonance section, and the resonance frequency characteristic in the case that the DC load current is small is formed using the first resonance section, the second resonance capacitor of the second resonance section and the switching transformer.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: November 4, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Patent number: 7436130
    Abstract: A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a direct-current voltage to one pair of alternating-voltages. Since leakage impedances of step-up transformers are low, the first block functions as one pair of low-impedance power sources. Each second block is connected to each cold-cathode tube. A ballast inductor stabilizes tube current by resonating with a matching capacitor during lighting of the cold-cathode tube. A combined impedance of the matching capacitor and a peripheral stray capacitance is matched with an impedance of the ballast inductor, for each cold-cathode tube. Since a delay circuit shifts phases of two pulse waves with respect to each other, a phase difference between the alternating-voltages is shifted from 180°.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: October 14, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka
  • Publication number: 20080047743
    Abstract: For the purpose of lighting multiple cold-cathode tubes at uniform luminance using a cold-cathode tube lighting device incorporating a multilayer substrate with built-in capacitors through a common power source and downsizing the cold-cathode tube lighting device, the multilayer substrate with built-in capacitors comprising at least four conductor layers overlaid is formed by heating and pressing dielectric layers, on one side of each of which a conductor layer is formed, to both sides of a dielectric layer, on both sides of which a conductor layer is formed, respectively, with bonding layers P1 and P2 interposed therebetween and by press-bonding these layers mutually, and specific conductor layers are electrically connected using connection parts formed on the inner faces of through holes.
    Type: Application
    Filed: November 16, 2005
    Publication date: February 28, 2008
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka, Toshio Manabe
  • Publication number: 20080024094
    Abstract: For the purpose of providing a resonant switching power supply device having a wide output voltage variable range by changing its switching frequency, the resonance circuit thereof comprises a switching transformer, a first resonance section connected in series with the switching transformer, and a second resonance section connected in parallel with the switching transformer, wherein the resonance frequency characteristic in the case that the DC load current is large is formed using the series-connected devices of the first resonance section, and the resonance frequency characteristic in the case that the DC load current is small is formed using the first resonance section, the second resonance capacitor of the second resonance section and the switching transformer.
    Type: Application
    Filed: April 20, 2005
    Publication date: January 31, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Publication number: 20070132406
    Abstract: A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a direct-current voltage to one pair of alternating-voltages. Since leakage impedances of step-up transformers are low, the first block functions as one pair of low-impedance power sources. Each second block is connected to each cold-cathode tube. A ballast inductor stabilizes tube current by resonating with a matching capacitor during lighting of the cold-cathode tube. A combined impedance of the matching capacitor and a peripheral stray capacitance is matched with an impedance of the ballast inductor, for each cold-cathode tube. Since a delay circuit shifts phases of two pulse waves with respect to each other, a phase difference between the alternating-voltages is shifted from 180°.
    Type: Application
    Filed: April 21, 2005
    Publication date: June 14, 2007
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka
  • Publication number: 20070093165
    Abstract: A cold-cathode tube lighting device uniformly lights multiple cold-cathode tubes using a common power source, and the cold-cathode tube lighting device is effectively downsized by using ballast capacitors. A substrate is divided into blocks as many as the cold-cathode tubes. Each of the blocks includes two conductor layers each including two foils. A first foil of a first conductor layer is connected to a common low-impedance power supply. Between the two conductor layers, first ballast capacitors are formed in areas where the first foils are overlapped, second ballast capacitors are formed in areas where the first and second foils are overlapped, and the third ballast capacitors are formed in areas where the second foils are overlapped. Second foils are connected to first electrodes of the cold-cathode tubes.
    Type: Application
    Filed: April 21, 2005
    Publication date: April 26, 2007
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka, Toshio Manabe
  • Patent number: 7164340
    Abstract: A transformer is constituted of an inner core, a plurality of outer cores connected in a ring to the inner core, a primary winding which is fed with a high frequency wave and wound around the inner core, and a secondary winding wound outside the primary winding. The secondary winding has, for the two outer cores, windings which are caused to pass at least once between the inner core and each of the respective outer cores, and the windings passed in the same direction are connected in parallel. With this configuration, it is possible to achieve a transformer for a switching power supply with a low voltage regulation.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: January 16, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Jun Nakagawa, Kenji Kawataka, Akeyuki Komatsu
  • Patent number: 7038397
    Abstract: A first block (1) converts a DC voltage (Vi) into an AC voltage (V) of a high frequency, using a high-frequency oscillator circuit (4) and a step-up transformer (5). The first block (1) acts as a low-impedance power supply owing to suppression of leakage flux in the step-up transformer (5). A second block (2) and a third block (3) are connected to each CCFL (20). A ballast inductor (LB) causes the CCFL (20) to shine through the resonance with a matching capacitor (CM), and then maintains the stable lamp current during shining of the CCFL (20). The capacitance of the matching capacitor (CM) is separately adjusted for each CCFL (20), and thereby, the total impedance of the matching capacitor (CM) and the surrounding stray capacitances is matched to the impedance of the series connection of the ballast inductor (LB) and an overcurrent protection capacitor (CP).
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: May 2, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Akeyuki Komatsu, Eiji Miyake, Kenji Kawataka