Patents by Inventor Eishin Matsumoto
Eishin Matsumoto 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: 9488696Abstract: A voltage detection apparatus comprises discharge circuits constituted by switch elements and resistors connected in series, and respectively connected in parallel to each of a plurality of battery cells constituting a storage battery, filter circuits provided for the respective battery cells and removing noise contained in voltage inputted by the battery cells, and voltage detection units (D) and (M) which detect voltage of the respective battery cells in which noise is removed by the filter circuits. The voltage detection units correct detection results, based on time from when the switch elements of the discharge circuits change into an OFF state to timing for detecting voltage of the battery cells. With this voltage detection apparatus, it is possible to correct the detection error of the voltage of the battery cell due to the influence of the filter circuit, thus improving the detection accuracy of the voltage of the battery cell.Type: GrantFiled: March 7, 2014Date of Patent: November 8, 2016Assignee: KEIHIN CORPORATIONInventors: Eishin Matsumoto, Seiji Kamata, Shinichi Sato
-
Patent number: 9142981Abstract: A cell balance control unit is provided, including: a discharge circuit connected to each of a plurality of battery cells constituting a battery in parallel; a voltage detecting circuit that detects a voltage of each of the battery cells; and a control device that controls each of the switching elements of the discharge circuit so that the voltage of each of the battery cells is made uniform based on voltage detection results of each of the battery cells, wherein the control device controls the switching elements of the discharge circuits connected to the adjacent battery cells in each different duty ratio, and detects disconnection of wirings extracted from both ends of each battery cell based on a potential difference between the adjacent battery cells.Type: GrantFiled: October 2, 2012Date of Patent: September 22, 2015Assignee: KEIHIN CORPORATIONInventors: Seiji Kamata, Eishin Matsumoto
-
Patent number: 8941355Abstract: What is provided is a cell balance control device including: a bypass circuit including a direct circuit with a bypass resistance and a switching element, the bypass circuit being connected in parallel to each of a plurality of cells included in a battery; a cell voltage detection unit detecting a cell voltage of each of the plurality of cells; a temperature detection unit detecting a temperature of a substrate on which the bypass circuit is mounted; and a control unit controlling and computing a duty ratio of the switching element based on a value detected by the temperature detection unit and a cell voltage of a discharge-needed cell obtained by the cell voltage detection unit.Type: GrantFiled: November 28, 2011Date of Patent: January 27, 2015Assignee: Keihin CorporationInventors: Seiji Kamata, Eishin Matsumoto
-
Publication number: 20120133330Abstract: What is provided is a cell balance control device including: a bypass circuit including a direct circuit with a bypass resistance and a switching element, the bypass circuit being connected in parallel to each of a plurality of cells included in a battery; a cell voltage detection unit detecting a cell voltage of each of the plurality of cells; a temperature detection unit detecting a temperature of a substrate on which the bypass circuit is mounted; and a control unit controlling and computing a duty ratio of the switching element based on a value detected by the temperature detection unit and a cell voltage of a discharge-needed cell obtained by the cell voltage detection unit.Type: ApplicationFiled: November 28, 2011Publication date: May 31, 2012Applicant: KEIHIN CORPORATIONInventors: Seiji KAMATA, Eishin MATSUMOTO
-
Patent number: 8138645Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: GrantFiled: March 25, 2010Date of Patent: March 20, 2012Assignee: Keihin CorporationInventors: Hidefumi Abe, Hideki Sasaki, Toshiro Mayumi, Eishin Matsumoto
-
Patent number: 8004134Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: GrantFiled: March 25, 2010Date of Patent: August 23, 2011Assignee: Keihin CorporationInventors: Hidefumi Abe, Hideki Sasaki, Toshiro Mayumi, Eishin Matsumoto
-
Patent number: 7772731Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: GrantFiled: March 14, 2008Date of Patent: August 10, 2010Assignee: Keihin CorporationInventors: Hidefumi Abe, Hideki Sasaki, Toshiro Mayumi, Eishin Matsumoto
-
Publication number: 20100176672Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: ApplicationFiled: March 25, 2010Publication date: July 15, 2010Applicant: KEIHIN CORPORATIONInventors: Hidefumi ABE, Hideki SASAKI, Toshiro MAYUMI, Eishin MATSUMOTO
-
Publication number: 20100176666Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: ApplicationFiled: March 25, 2010Publication date: July 15, 2010Applicant: KEIHIN CORPORATIONInventors: Hidefumi ABE, Hideki SASAKI, Toshiro MAYUMI, Eishin MATSUMOTO
-
Publication number: 20080224553Abstract: A rotary actuator including: a housing that rotatably supports thereinside a rotor shaft of an electric motor; an eccentric shaft portion that is provided on a protruding end portion of the rotor shaft that protrudes outside the housing; an external gear that is rotatably supported on the eccentric shaft portion via a bearing; an internal gear that is fixed to an outer surface of the housing and meshes with the external gear; and a transmitting portion that is provided on the external gear, and transmits rotation force to an external output shaft.Type: ApplicationFiled: March 14, 2008Publication date: September 18, 2008Inventors: Hidefumi Abe, Hideki Sasaki, Toshiro Mayumi, Eishin Matsumoto