Patents by Inventor Shunichi SAWANO

Shunichi SAWANO 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).

  • Patent number: 10396661
    Abstract: In a power supply control apparatus, when a semiconductor switch is switched ON, a charging circuit increases a base voltage. A first switch is ON if a differential voltage obtained by subtracting a gate voltage from a base voltage is at least a first reference voltage, and is OFF if the differential voltage is smaller than the first reference voltage. If the first switch is ON, a battery or a capacitor charges parasitic capacitors of the semiconductor switch.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: August 27, 2019
    Assignees: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Shunichi Sawano, Yuuki Sugisawa
  • Publication number: 20190260200
    Abstract: A power supply control apparatus includes: a semiconductor switching element switched with PWM control; a PWM signal output unit outputting a PWM signal; a current circuit outputting a current related to a current flowing through the semiconductor switching element; a filter circuit converting the current that is output from the current circuit to a voltage; an overcurrent protection circuit turning off the semiconductor switching element based on a voltage value of the voltage filtered by the filter circuit; a voltage detection unit detecting the voltage value of the voltage at a timing near an end of a pulse of a PWM signal; a temperature estimation unit estimating, a temperature of an electric wire through which a current flows that also flows through the semiconductor switching element; and an electric wire protection unit turning off the semiconductor switching element based on the temperature estimated by the temperature estimation unit.
    Type: Application
    Filed: January 13, 2017
    Publication date: August 22, 2019
    Applicants: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Shunichi Sawano, Yuuki Sugisawa, Kota Oda, Keisuke Mase
  • Publication number: 20190260338
    Abstract: A power supply control device controls power supply via a switch by causing a drive circuit to turn on and off the switch. A first resistance is disposed on a path of a current flowing via the switch. A differential amplifier outputs a voltage corresponding to a value of a voltage between two ends of the first resistance. A first capacitor is connected between a point midway on a path of power supply to the differential amplifier and an upstream end of the first resistance. A second capacitor is connected between a point midway on the path of power supply and a downstream end of the first resistance.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 22, 2019
    Inventors: Kota Oda, Masayuki Kato, Shunichi Sawano, Shinnosuke Nakaguchi
  • Publication number: 20190260197
    Abstract: Provided is a control device that stops the power supply when the first FET is short-circuited. In the control device, a boost circuit increases the voltage of one end of a resistor on the boost circuit side to a predetermined voltage that is higher than the source voltage of the first FET. An AND circuit instructs the discharge circuit to decrease the voltage at the other end of the resistor when the voltage at the other end of the resistor is less than a threshold voltage if the AND circuit instructs the boost circuit to increase the voltage at the one end of the resistor on the boost circuit side. The threshold voltage exceeds the voltage at the one end of the resistor if the voltage at the one end of the resistor on the boost circuit is the predetermined voltage and if the first FET is short-circuited.
    Type: Application
    Filed: February 18, 2019
    Publication date: August 22, 2019
    Inventors: Shinnosuke Nakaguchi, Masayuki Kato, Shunichi Sawano, Takeo Uchino
  • Publication number: 20190258284
    Abstract: A power supply control device includes a switch disposed in a first current path of a current flowing from a battery. A first comparator compares a voltage value of a current input end of the switch to which the current is inputted with a voltage threshold. When the voltage value of the current input end is less than the voltage threshold, a drive circuit turns off the switch. The battery supplies, via a second current path, power to a starter that starts an engine of a vehicle. The voltage threshold is less than the voltage value of the current input end of the switch in the case where the battery supplies the power to the starter.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 22, 2019
    Inventors: Shunichi Sawano, Yuuki Sugisawa, Kota Oda
  • Publication number: 20190214982
    Abstract: If a main switch and a sub-switch are OFF and ON respectively, a comparator compares a source voltage value of the main switch to an output voltage value of a direct-current power source. In the same case, the comparator compares an end-to-end voltage value between a source and a drain of the main switch to a threshold value. A voltage value of the voltage applied to one end of the sub-switch is lower than the voltage value at the drain of the main switch. The output voltage value of the direct-current power source is lower than the voltage value. The threshold value is lower than the difference between the voltage value at the drain of the main switch and the voltage.
    Type: Application
    Filed: June 7, 2017
    Publication date: July 11, 2019
    Inventors: Shunichi SAWANO, Yuuki SUGISAWA
  • Publication number: 20190181850
    Abstract: A power supply control device and a power supply control method capable of detecting a switch-related failure properly are provided. A power supply control device controls power supply via a switch. An output unit of a microcomputer produces a switching signal that instructs the switch to turn alternately on and off. A detection circuit reports a failure related to the switch if an accumulated period has reached or exceeded a threshold period. The accumulated period is accumulation of one or more periods when the switching signal instructs the switch to turn on but a comparator does not detect an on-state of the switch.
    Type: Application
    Filed: December 12, 2018
    Publication date: June 13, 2019
    Inventors: Shunichi Sawano, Yuuki Sugisawa
  • Publication number: 20190181751
    Abstract: In a power supply control apparatus, when a semiconductor switch is switched ON, a charging circuit increases a base voltage. A first switch is ON if a differential voltage obtained by subtracting a gate voltage from a base voltage is at least a first reference voltage, and is OFF if the differential voltage is smaller than the first reference voltage. If the first switch is ON, a battery or a capacitor charges parasitic capacitors of the semiconductor switch.
    Type: Application
    Filed: May 9, 2017
    Publication date: June 13, 2019
    Applicants: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Shunichi SAWANO, Yuuki SUGISAWA
  • Publication number: 20190165561
    Abstract: Provided is a power supply control apparatus, a power supply control method, and a computer program that can prevent an extremely large current from flowing via a switch. A power supply control apparatus is configured to control power supply via a switch. A control unit is configured to determine whether to switch ON a semiconductor switch. If the control unit determines to switch ON the switch, when a voltage value at a current input terminal of the switch, to which a current is input, is lower than a predetermined voltage value, a driving circuit is configured to switch ON the switch.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 30, 2019
    Inventors: Shunichi SAWANO, Yuuki SUGISAWA
  • Publication number: 20190058319
    Abstract: A power supply control apparatus that includes a switching circuit that turns ON or OFF a switch provided at a point along a wire, wherein power supply via the wire is controlled by switching with the switching circuit; a current output circuit configured to output a current whose current value increases as a current value of a current flowing through the wire increases; a resistance circuit through which the current that the current output circuit outputs flows, wherein the resistance circuit includes: a first resistor; and a series circuit of a second resistor and a capacitor that is connected in parallel to the first resistor; and a voltage applying circuit configured to, if an end-to-end voltage value across the resistance circuit becomes higher than or equal to a predetermined voltage value, apply a voltage whose value is higher than the predetermined voltage value.
    Type: Application
    Filed: March 9, 2017
    Publication date: February 21, 2019
    Applicants: AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD., SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Shunichi SAWANO, Yuuki SUGISAWA
  • Publication number: 20180358800
    Abstract: A control circuit turns ON or OFF a switch that is provided at a midpoint of a wire. Thus, power supply via the wire is controlled. A current output circuit outputs a current that corresponds to a current flowing through the wire to a resistance circuit. In the resistance circuit, a series circuit of a resistor (R2) and a capacitor (C1) is connected in parallel to a resistor (R1). The control circuit) turns OFF the switch if the end-to-end voltage value of a voltage across both ends of the resistance circuit is larger than or equal to a reference voltage value.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 13, 2018
    Inventors: Shunichi Sawano, Yuuki Sugisawa, Kota Oda, Keisuke Mase
  • Publication number: 20180358806
    Abstract: In a power supply control apparatus, a control circuit adjusts a resistance between a drain and a source of a semiconductor transistor by adjusting the voltage at a gate of the semiconductor transistor. After the control circuit has lowered the resistance between the drain and the source, a control portion determines whether or not the voltage at the source detected by a voltage detecting portion is larger than or equal to a standard voltage. If the voltage at the source is larger than or equal to the standard voltage, the control circuit again lowers the resistance between the drain and the source. If the voltage at the source is smaller than the standard voltage, the control circuit adjusts the resistance between the drain and the source to a resistance at the time when determination was performed or larger.
    Type: Application
    Filed: December 21, 2016
    Publication date: December 13, 2018
    Inventors: Keisuke Mase, Yuuki Sugisawa, Kota Oda, Shunichi Sawano
  • Publication number: 20180351346
    Abstract: A power supply control device prevents an electrical wire and a switch element from smoking. The power supply control device includes a switch element provided at a midpoint in an electrical wire that connects a power supply and a load. A current detection unit detects the current value of current flowing in the electrical wire. A temperature estimation unit estimates the wire temperature of the electrical wire based on the current value detected by the current detection unit. A control unit turns on or off the switch element based on the wire temperature estimated. The control unit estimates the smoking temperature of the switch element by changing the heat dissipation time constant of the electrical wire used in temperature calculation to a smaller value, and turns off the switch element if the wire temperature is greater than or equal to the estimated smoking temperature of the switch element.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 6, 2018
    Inventors: Yuuki Sugisawa, Shunichi Sawano
  • Publication number: 20180331556
    Abstract: In a power supply control apparatus, if a switching signal input from a microcomputer to a control circuit instructs switching on of a semiconductor switch, when an input voltage that is input to the drain of the semiconductor switch is higher than or equal to a predetermined voltage, the control circuit drives a charging circuit. The charging circuit charges a capacitor (Cs) via a diode (D1). Accordingly, a voltage at the gate of the semiconductor switch taking a potential at the source of the semiconductor switch as a reference becomes higher than or equal to a predetermined voltage, and thus the semiconductor switch is switched on. While driving the charging circuit, the control circuit keeps driving the charging circuit even if the input voltage becomes lower than the predetermined voltage.
    Type: Application
    Filed: November 28, 2016
    Publication date: November 15, 2018
    Inventors: Yuuki SUGISAWA, Shunichi SAWANO, Kota ODA, Keisuke MASE
  • Publication number: 20170288424
    Abstract: The present invention aims to efficiently use all of a plurality of capacitors connected in series, and control a voltage held by a capacitor unit according to environmental temperature. A switch element inserted into a charging path leading to the capacitor unit, and a switch control part controlling the opening and closing of the switch element, are provided. The switch control part includes: a first voltage divider circuit that includes a pair of resistor elements, and that produces and outputs a voltage that is a fraction of the voltage held by the capacitor unit; and a comparison result output circuit that controls the opening and closing of the switch element based on the result of comparing a potential output from the first voltage divider circuit and a predetermined potential. The pair of resistor elements are different from each other in terms of temperature dependency of resistance values thereof.
    Type: Application
    Filed: September 15, 2015
    Publication date: October 5, 2017
    Applicants: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Shunichi SAWANO, Katsuya IKUTA
  • Patent number: 9748064
    Abstract: A fail-safe circuit enables a switch to turn on/off according to a signal from an external device if a microcomputer that controls the turning on/off of the switch falls into an abnormal state and is reset, and if the power supply for a circuit that backs up the control of the switch is lost. The fail-safe circuit includes a microcomputer that controls the turning on/off of a switch based on an instruction signal from an input terminal, a watchdog circuit that generates a reset signal based on a watchdog pulse from the microcomputer, and a transistor for masking a watchdog pulse for resetting a flip-flop circuit that is set by the reset signal. If a voltage supplied by a power supply circuit is lost, a transistor turns off, and therefore the switch turns on/off according to an instruction signal supplied to an output terminal via a resistor and a diode.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: August 29, 2017
    Assignees: AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD., SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Shunichi Sawano
  • Publication number: 20160056001
    Abstract: A fail-safe circuit enables a switch to turn on/off according to a signal from an external device if a microcomputer that controls the turning on/off of the switch falls into an abnormal state and is reset, and if the power supply for a circuit that backs up the control of the switch is lost. The fail-safe circuit includes a microcomputer that controls the turning on/off of a switch based on an instruction signal from an input terminal, a watchdog circuit that generates a reset signal based on a watchdog pulse from the microcomputer, and a transistor for masking a watchdog pulse for resetting a flip-flop circuit that is set by the reset signal. If a voltage supplied by a power supply circuit is lost, a transistor turns off, and therefore the switch turns on/off according to an instruction signal supplied to an output terminal via a resistor and a diode.
    Type: Application
    Filed: April 14, 2014
    Publication date: February 25, 2016
    Applicants: AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD., SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Shunichi SAWANO