Patents by Inventor Fujiyuki IWAMOTO
Fujiyuki IWAMOTO 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: 10443557Abstract: An igniter includes a switching element, a control circuit section, and a protection element. The switching element is connected to a primary winding of an ignition coil. The control circuit section is configured to control operation of the switching element. The protection element is configured to electrically protect the control circuit section. The switching element and the protection element are formed in the same semiconductor chip, and are mounted on the same lead frame.Type: GrantFiled: October 7, 2016Date of Patent: October 15, 2019Assignee: DENSO CORPORATIONInventors: Motoo Yamaguchi, Fujiyuki Iwamoto, Shunichi Takeda
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Patent number: 10424902Abstract: An ignition device capable of more reliably protecting a primary winding of an ignition coil from high temperature is provided. The ignition device includes an ignition coil, a switching element, a temperature sensor, and a thermal cutout circuit. A primary winding of the ignition coil is connected to a DC power supply and the switching element. The temperature sensor is provided to measure the temperature of the switching element. The thermal cutout circuit forcibly turns off the switching element when the temperature of the switching element becomes higher than a predetermined forcible turn-off temperature Toff. The thermal cutout circuit is configured to lower the forcible turn-off temperature Toff when the power supply voltage Vb of the DC power supply decreases.Type: GrantFiled: July 10, 2017Date of Patent: September 24, 2019Assignee: DENSO CORPORATIONInventors: Fujiyuki Iwamoto, Shunichi Takeda
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Publication number: 20180320652Abstract: An igniter includes a switching element, a control circuit section, and a protection element. The switching element is connected to a primary winding of an ignition coil. The control circuit section is configured to control operation of the switching element. The protection element is configured to electrically protect the control circuit section. The switching element and the protection element are formed in the same semiconductor chip, and are mounted on the same lead frame.Type: ApplicationFiled: October 7, 2016Publication date: November 8, 2018Inventors: Motoo YAMAGUCHI, Fujiyuki IWAMOTO, Shunichi TAKEDA
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Publication number: 20180013266Abstract: An ignition device capable of more reliably protecting a primary winding of an ignition coil from high temperature is provided. The ignition device includes an ignition coil, a switching element, a temperature sensor, and a thermal cutout circuit. A primary winding of the ignition coil is connected to a DC power supply and the switching element. The temperature sensor is provided to measure the temperature of the switching element. The thermal cutout circuit forcibly turns off the switching element when the temperature of the switching element becomes higher than a predetermined forcible turn-off temperature Toff. The thermal cutout circuit is configured to lower the forcible turn-off temperature Toff when the power supply voltage Vb of the DC power supply decreases.Type: ApplicationFiled: July 10, 2017Publication date: January 11, 2018Inventors: Fujiyuki IWAMOTO, Shunichi TAKEDA
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Patent number: 9496790Abstract: In a power conversion apparatus, a secondary winding is connected between main terminals of one of two circuit elements included in a main series circuit, and a voltage applied to a primary winding induces a voltage in a secondary winding in a direction from a first main terminal of a secondary winding, which is disposed at a low-potential side of the main series circuit, toward a second main terminal of a secondary winding, which is disposed at a high-potential side of the main series circuit. A rectifying unit blocks a current flowing from the high-potential side of the main series circuit toward the low-potential side of the main series circuit in a current path that includes the secondary winding and bypasses one of the two circuit elements included in the main series circuit.Type: GrantFiled: April 3, 2015Date of Patent: November 15, 2016Assignee: DENSO CORPORATIONInventors: Fujiyuki Iwamoto, Kazuhiro Umetani
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Patent number: 9300208Abstract: A series circuit of a diode Da1, capacitors Ca1, Ca2 and a diode Da2 is connected in parallel to a series circuit of switching elements S1 and S2. A common junction between the capacitors Ca1 and Ca2 is connected to an emitter of the switching element S2. A series circuit of a switching element Sa1 and a diode Da3 is connected between a cathode of the diode Da1 and a cathode of the diode Da2. A series circuit of a diode Da4 and a switching element Sa2 is connected between an anode of the diode Da1 and the ground. A reactor La1 is connected between a source of the switching element Sa1 and a drain of the switching element Sa2.Type: GrantFiled: May 28, 2014Date of Patent: March 29, 2016Assignee: DENSO CORPORATIONInventors: Fujiyuki Iwamoto, Kazuhiro Umetani
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Publication number: 20150288290Abstract: In a power conversion apparatus, a secondary winding is connected between main terminals of one of two circuit elements included in a main series circuit, and a voltage applied to a primary winding induces a voltage in a secondary winding in a direction from a first main terminal of a secondary winding, which is disposed at a low-potential side of the main series circuit, toward a second main terminal of a secondary winding, which is disposed at a high-potential side of the main series circuit. A rectifying unit blocks a current flowing from the high-potential side of the main series circuit toward the low-potential side of the main series circuit in a current path that includes the secondary winding and bypasses one of the two circuit elements included in the main series circuit.Type: ApplicationFiled: April 3, 2015Publication date: October 8, 2015Inventors: Fujiyuki IWAMOTO, Kazuhiro UMETANI
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Publication number: 20140354254Abstract: A series circuit of a diode Da1, capacitors Ca1, Ca2 and a diode Da2 is connected in parallel to a series circuit of switching elements S1 and S2. A common junction between the capacitors Ca1 and Ca2 is connected to an emitter of the switching element S2. A series circuit of a switching element Sa1 and a diode Da1 is connected between a cathode of the diode Da1 and a cathode of the diode Da2. A series circuit of a diode Da4 and a switching element Sa2 is connected between an anode of the diode Da1 and the ground. A reactor La1 is connected between a source of the switching element Sa1 and a drain of the switching element Sa2.Type: ApplicationFiled: May 28, 2014Publication date: December 4, 2014Applicant: DENSO CORPORATIONInventors: Fujiyuki IWAMOTO, Kazuhiro UMETANI