Patents by Inventor Koji Umetsu

Koji Umetsu 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: 20120212980
    Abstract: A power supply apparatus supplies regulated power to an external apparatus. A power switch is turned on to receive AC power and turned off not to receive the AC power. The AC power is rectified by a rectifying section and is switched by a switching section into switched DC power which is smoothed by a rectifying/smoothing section. Upon reception of an alarm signal, the power disconnecting section stops sending the switched DC power to the rectifying/smoothing section. If the AC switch is turned off and then back on again after stopping sending the switched DC power to the smoothing section, the power disconnecting section allows receiving of the AC power only a time after turn-off of the power switch. Upon reception of an auto-off signal indicative of an idle state of the external apparatus, an auto-off section does not send the switched DC power to the rectifying/smoothing section.
    Type: Application
    Filed: February 21, 2012
    Publication date: August 23, 2012
    Applicant: OKI DATA CORPORATION
    Inventors: Takahiro KATO, Motonobu Hatakeyama, Koji Umetsu
  • Patent number: 8179101
    Abstract: A charging apparatus includes a power supply circuit converting AC input into DC output, a secondary battery, having a plurality of batteries connected in series, which is charged by an output voltage of the power supply circuit, a charging control circuit that controls charging in a constant-current mode for charging the secondary battery with a constant current and, when a terminal voltage of the secondary battery reaches a predetermined voltage, switches the charging in the constant-current mode to a constant-voltage mode for charging the secondary battery to a constant voltage, and a plurality of voltage control circuits, each of which adjusts the voltage of each of the plurality of batteries to a set voltage. The plurality of voltage control circuits respectively detect voltage rises of the plurality of batteries, and one of the voltage control circuits, first detecting attainment of the set voltage, performs subsequent voltage control.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: May 15, 2012
    Assignee: Sony Corporation
    Inventors: Koji Umetsu, Keiji Tsuchiya
  • Patent number: 8098052
    Abstract: A batter charger for charging a secondary batter using a power supply circuit which converts an AC input into a DC output, includes a first resistor for detecting constant-current control and a second resistor for detecting end of charging. The first resister and the second register are inserted in series in a current path of the charging current. The power supply circuit has output characteristics of a constant-current control characteristic and a constant-voltage control characteristic. The constant-current control is performed using a first detection voltage generated at the first resistor, and the constant-voltage control is performed by comparing a second detection voltage generated at a series resistor composed of the first resistor and the second resistor with a reference voltage using a comparator, and detecting an end of charging indicated by the second detection voltage fallen below the reference voltage.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: January 17, 2012
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Patent number: 8035347
    Abstract: A battery charger for charging a secondary battery using a power supply circuit, includes a discrimination circuit to discriminate a constant-current charging mode and a constant-voltage charging mode, and a controller to which a discrimination signal is supplied. When judged as being the constant-current charging mode, the controller sets the current in the constant-current charging mode by using the control signal. When judged as being the constant-voltage charging mode in accordance with the discrimination signal, the controller sets intermittently the end of charging detection current, and sets an end of charging detection period for judging the constant-current charging mode and the constant-voltage charging mode. When the discrimination signal indicates the constant-voltage charging mode in the end of charging detection period, the controller controls to shift to the end of charging detection mode.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: October 11, 2011
    Assignee: Sony Corporation
    Inventors: Koji Umetsu, Masanao Sato, Kazumi Sato
  • Patent number: 7999511
    Abstract: A battery charger for charging a plurality of secondary batteries is provided. The charger is configured to be connected to a power supply circuit and configured so that an output of the circuit is connected to the batteries. The battery charger includes a first switch for connecting the batteries in series, a second switch to selectively connect a first polarity terminal of a first secondary battery having a highest electric potential, a DC-DC converter having a first and second polarity input terminals, the first polarity input terminal being to be connected to the first polarity terminal via the second switch, the second polarity input terminal being to be connected to a second polarity terminal of a second secondary battery having a lowest electric potential, an external power supply output terminal connected to an output terminal of the DC-DC converter, and a controller for controlling the first and second switches.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: August 16, 2011
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Publication number: 20100090647
    Abstract: A charging apparatus includes a power supply circuit converting AC input into DC output, a secondary battery, having a plurality of batteries connected in series, which is charged by an output voltage of the power supply circuit, a charging control circuit that controls charging in a constant-current mode for charging the secondary battery with a constant current and, when a terminal voltage of the secondary battery reaches a predetermined voltage, switches the charging in the constant-current mode to a constant-voltage mode for charging the secondary battery to a constant voltage, and a plurality of voltage control circuits, each of which adjusts the voltage of each of the plurality of batteries to a set voltage. The plurality of voltage control circuits respectively detect voltage rises of the plurality of batteries, and one of the voltage control circuits, first detecting attainment of the set voltage, performs subsequent voltage control.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 15, 2010
    Applicant: Sony Corporation
    Inventors: Koji Umetsu, Keiji Tsuchiya
  • Publication number: 20090027011
    Abstract: A batter charger for charging a secondary batter using a power supply circuit which converts an AC input into a DC output, includes a first resistor for detecting constant-current control and a second resistor for detecting end of charging. The first resister and the second register are inserted in series in a current path of the charging current. The power supply circuit has output characteristics of a constant-current control characteristic and a constant-voltage control characteristic. The constant-current control is performed using a first detection voltage generated at the first resistor, and the constant-voltage control is performed by comparing a second detection voltage generated at a series resistor composed of the first resistor and the second resistor with a reference voltage using a comparator, and detecting an end of charging indicated by the second detection voltage fallen below the reference voltage.
    Type: Application
    Filed: July 21, 2008
    Publication date: January 29, 2009
    Applicant: SONY CORPORATION
    Inventor: Koji Umetsu
  • Publication number: 20090027012
    Abstract: A battery charger for charging a secondary battery using a power supply circuit, includes a discrimination circuit to discriminate a constant-current charging mode and a constant-voltage charging mode, and a controller to which a discrimination signal is supplied. When judged as being the constant-current charging mode, the controller sets the current in the constant-current charging mode by using the control signal. When judged as being the constant-voltage charging mode in accordance with the discrimination signal, the controller sets intermittently the end of charging detection current, and sets an end of charging detection period for judging the constant-current charging mode and the constant-voltage charging mode. When the discrimination signal indicates the constant-voltage charging mode in the end of charging detection period, the controller controls to shift to the end of charging detection mode.
    Type: Application
    Filed: July 17, 2008
    Publication date: January 29, 2009
    Applicant: SONY CORPORATION
    Inventors: Koji Umetsu, Masanao Sato, Kazumi Sato
  • Publication number: 20080315846
    Abstract: A battery pack, a battery charger, a method for charging a battery pack are provided. The battery pack includes a secondary battery, a switch element for controlling charging and discharging the secondary battery, a controller for controlling the switch element, and a communication unit for performing with a battery charger. During charging, an initial charging is switched to a quick charging when a voltage of the secondary battery reaches a predetermined voltage, and the battery charger judges the battery pack as abnormal when the voltage does not reach the predetermined voltage within a timeout period after the initial charging is started. At least one of the timeout period and the predetermined is stored. At least one of the timeout period and the predetermined voltage to be read out is transmitted through the communication unit to the battery charger.
    Type: Application
    Filed: February 29, 2008
    Publication date: December 25, 2008
    Applicant: SONY CORPORATION
    Inventors: Masanao Sato, Koji Umetsu, Osamu Nagashima
  • Publication number: 20080290834
    Abstract: A battery charger for charging a plurality of secondary batteries is provided. The charger is configured to be connected to a power supply circuit and configured so that an output of the circuit is connected to the batteries. The battery charger includes a first switch for connecting the batteries in series, a second switch to selectively connect a first polarity terminal of a first secondary battery having a highest electric potential, a DC-DC converter having a first and second polarity input terminals, the first polarity input terminal being to be connected to the first polarity terminal via the second switch, the second polarity input terminal being to be connected to a second polarity terminal of a second secondary battery having a lowest electric potential, an external power supply output terminal connected to an output terminal of the DC-DC converter, and a controller for controlling the first and second switches.
    Type: Application
    Filed: May 2, 2008
    Publication date: November 27, 2008
    Applicant: Sony Corporation
    Inventor: Koji UMETSU
  • Patent number: 7035121
    Abstract: An AC power supply supplied from an outlet 11 is rectified by a rectifying circuit 13 through an input filter 12. The rectified power is supplied to a primary winding N1 of a transformer 14. A controlling circuit 19 has a switching device Q1 that controls on/off at predetermined timing. An FB signal that represents a power state of a load circuit 15 is supplied to the controlling circuit 19 through a transistor Q2. A comparator 20 compares a rectified voltage V3 of a tertiary winding of the transformer with a reference voltage REF3 and outputs an error signal. With the error signal, the transistor Q2 is controlled. Thus, the voltage for the controlling circuit supplied from the tertiary winding can be prevented from lowering against abrupt load variation. In addition, the output voltage Vo can be prevented from largely varying.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: April 25, 2006
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Publication number: 20050162874
    Abstract: An AC power supply supplied from an outlet 11 is rectified by a rectifying circuit 13 through an input filter 12. The rectified power is supplied to a primary winding N1 of a transformer 14. A controlling circuit 19 has a switching device Q1 that controls on/off at predetermined timing. An FB signal that represents a power state of a load circuit 15 is supplied to the controlling circuit 19 through a transistor Q2. A comparator 20 compares a rectified voltage V3 of a tertiary winding of the transformer with a reference voltage REF3 and outputs an error signal. With the error signal, the transistor Q2 is controlled. Thus, the voltage for the controlling circuit supplied from the tertiary winding can be prevented from lowering against abrupt load variation. In addition, the output voltage Vo can be prevented from largely varying.
    Type: Application
    Filed: March 3, 2004
    Publication date: July 28, 2005
    Applicant: Sony Corporation
    Inventor: Koji Umetsu
  • Patent number: 6525947
    Abstract: Providing a power supply system having a plurality of power supply apparatuses connected in parallel to each other, each of which is not affected by a voltage fluctuation of a reverse flow-preventive diode provided in an output line thereof, and can provide a stable output voltage controlled with high accuracy. Each of the power supply apparatuses includes a positive output terminal 33 connected to a load 13, a reverse flow-preventive diode 31 connected to the positive output terminal 33, a VF correcting circuit 46 for detecting a forward voltage of the reverse flow-preventive diode 31 and providing a controlling unit with the detected voltage in a feedback manner, an output current detecting/correcting circuit 45 for detecting a forward current of the reverse flow-preventive diode 31 and providing the controlling unit with the detected current in a feedback manner, and the controlling unit for controlling the anode potential of the reverse flow-preventive diode 31.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: February 25, 2003
    Assignee: Sony Corporation
    Inventors: Koji Umetsu, Masayoshi Sasaki
  • Publication number: 20020015317
    Abstract: Providing a power supply system having a plurality of power supply apparatuses connected in parallel to each other, each of which is not affected by a voltage fluctuation of a reverse flow-preventive diode provided in an output line thereof, and can provide a stable output voltage controlled with high accuracy. Each of the power supply apparatuses includes a positive output terminal 33 connected to a load 13, a reverse flow-preventive diode 31 connected to the positive output terminal 33, a VF correcting circuit 46 for detecting a forward voltage of the reverse flow-preventive diode 31 and providing a controlling unit with the detected voltage in a feedback manner, an output current detecting/correcting circuit 45 for detecting a forward current of the reverse flow-preventive diode 31 and providing the controlling unit with the detected current in a feedback manner, and the controlling unit for controlling the anode potential of the reverse flow-preventive diode 31.
    Type: Application
    Filed: July 25, 2001
    Publication date: February 7, 2002
    Applicant: Sony Corporation
    Inventors: Koji Umetsu, Masayoshi Sasaki
  • Patent number: 6229723
    Abstract: A power unit is provided that is not affected by a voltage fluctuation of a reverse flow-preventive diode provided in an output line thereof and that can provide a stable output controlled with a high accuracy. A first rectified diode 17 rectified and a first smoothing capacitor 18 smoothes the voltage switched by a transformer 14 to generate a DC voltage (VP) at an A point. A reverse flow-preventive diode 21 and an output resistor 22 are provided between the A point and a positive output terminal 23. The comparison/detection circuit 25 compares the anode and cathode potentials of the reverse flow-preventive diode 21 with each other. The comparison/detection circuit 25 supplies a differential amplifier 26 the anode or cathode potential whichever is lower.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: May 8, 2001
    Assignee: Sony Corporation
    Inventors: Koji Umetsu, Masato Ishigaki
  • Patent number: 6005371
    Abstract: The invention provides a charging apparatus capable of charging a secondary battery regardless of a drive state of a set circuit such as a video camera and a personal computer, and having a simple circuit configuration which can be realized at low production costs. A first resistor Ro is provided between a power source and the set circuit 1 and a secondary battery 2. A current flowing to the first resistor Ro is detected by an amplifier A2. This detection result is used to control a total current Io flowing to a set main body 3 including the set circuit 1 and the secondary battery 2 as a unitary block. Simultaneously with this, a current flowing to the second resistor Rb is detected by an amplifier A3 and this detection result is used to control a charge current Ib flowing to the secondary battery 2.
    Type: Grant
    Filed: February 19, 1998
    Date of Patent: December 21, 1999
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Patent number: 5923150
    Abstract: A charging apparatus for controlling so as to charge a connected secondary battery by a constant current which is equal to or less than a constant voltage and to charge the secondary battery by a constant voltage which is equal to or less than the constant current when a terminal voltage of the secondary battery rises to the constant voltage is constructed by: switching means for shutting off a charge current at a certain period; comparing means for comparing a voltage difference between a first voltage on a power source side than the switching means when the charge current is shut off and a second voltage on the secondary battery side with a first reference voltage; and control means for stopping the charge or displaying the end of charge in accordance with the comparison result.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: July 13, 1999
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Patent number: 5923149
    Abstract: A charging apparatus controls the charging of a secondary battery such that charging is performed using a constant current as long as a terminal voltage of the secondary battery is less than a threshold voltage. When the terminal voltage rises to the threshold voltage, charging is performed using a constant voltage that is equal to or less than the threshold voltage.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: July 13, 1999
    Assignee: Sony Corporation
    Inventor: Koji Umetsu
  • Patent number: 5440220
    Abstract: A battery discharge control circuit is provided with a timer for timing the decision of the state of a battery loaded into a battery discharger between a discharged state and a nondischarged state so that the state of the battery is decided a predetermined time after the battery has been loaded into the battery discharger. The control circuit prevents the battery discharger from discharging an undischarged battery due to noise generated by chattering contact between the battery and the battery discharger in loading the battery into the battery discharger or due to the variation of the detected value of the terminal voltage of the battery caused by the influence of the self-healing characteristic and temperature characteristic of the battery. The control circuit also prevents the battery discharger from again discharging a discharged battery.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: August 8, 1995
    Assignee: Sony Corporation
    Inventors: Syojiro Sato, Koji Umetsu, Masayoshi Sasaki
  • Patent number: 5408170
    Abstract: A charging equipment for charging a secondary battery in a constant-current and constant-voltage mode, including a switching device for interrupting a charging current from flowing into the secondary battery at a predetermined period, a charging control device for controlling the operation of the switching device to control the charging, and a voltage detection device for detecting a voltage at a position near to the switching device (e.g., at the input or output side of the switching device) before the charging current is interrupted and a voltage between the switching device and the secondary battery after the charging current is interrupted, thereby calculating a voltage difference between the voltages, the charging control device controlling the operation of the switching device on the basis of the voltage difference of the voltage detection device.
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: April 18, 1995
    Assignee: Sony Corporation
    Inventors: Koji Umetsu, Masayoshi Sasaki, Syojiro Sato