Patents by Inventor Stéphane Raël

Stéphane Raël 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).

  • Method for determining a parameter of at least one accumulator of a battery
    Patent number: 8775106
    Abstract: A method for determining a parameter such as the resistance of at least one accumulator of a battery. The method includes the following steps: measuring a first voltage (U1) when the current is substantially equal to a predetermined value; conducting the plurality of voltage and current measurements (Un; In) during a current pulse; calculating a plurality of resistance values (Rn) from the first voltage and from the plurality of voltage and current measurements; determining a resistance value as the average of the calculated resistance values and an associated standard deviation; determining an absolute uncertainty on the value of the resistance as the product of the standard deviation and of a Student coefficient; if the relative uncertainty is less than or equal to a predetermined accuracy threshold, validating the resistance value (R).
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: July 8, 2014
    Assignee: Universite dé Lorraine
    Inventors: Ali Zenati, Philippe Desprez, Gerard Barrailh, Hubert Razik, Stephane Rael
  • METHOD FOR DETERMINING A PARAMETER OF AT LEAST ONE ACCUMULATOR OF A BATTERY
    Publication number: 20120022816
    Abstract: A method for determining a parameter such as the resistance of at least one accumulator of a battery, comprising the steps: measuring a first voltage (U1) when the current is substantially equal to a predetermined value; conducting the plurality of voltage and current measurements (Un; In) during a current pulse; calculating a plurality of resistance values (Rn) from the first voltage and from the plurality of voltage and current measurements; determining a resistance value as the average of the calculated resistance values and an associated standard deviation; determining an absolute uncertainty on the value of the resistance as the product of the standard deviation and of a Student coefficient; if the relative uncertainty is less than or equal to a predetermined accuracy threshold, validating the resistance value (R).
    Type: Application
    Filed: July 19, 2011
    Publication date: January 26, 2012
    Applicants: INSTITUT NATIONAL POLYTECHNIQUE DE LORRAINE, SAFT
    Inventors: Ali ZENATI, Philippe DESPREZ, Gerard BARRAILH, Hubert RAZIK, Stephane RAEL
  • Supercapacitor balancing method and system
    Patent number: 6777917
    Abstract: The present invention relates to a method of and a system for charging at least one supercapacitor that is particularly suitable for balancing supercapacitors.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: August 17, 2004
    Assignee: Alcatel
    Inventors: Philippe Desprez, Gérard Barrailh, Pascal Lavaur, Stéphane Raël, Fadi Sharif, Bernard Davat
  • Supercapacitor balancing method and system
    Patent number: 6664766
    Abstract: The present invention relates to a supercapacitor balancing method including bypassing the current flowing in the supercapacitor from a predetermined threshold voltage at the terminals of the supercapacitor, the bypass current being a function of the voltage at the terminals of the supercapacitor and increasing continuously as a function of the voltage. The method is characterized in that the bypass current increases between the threshold voltage, for which the bypass current constitutes a minimum bypass current, and a reference voltage, for which the bypass current constitutes a nominal bypass current, and in that the difference between the reference voltage and the threshold voltage is less than 200 mV and the ratio between the nominal bypass current and the minimum bypass current is greater than 100.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: December 16, 2003
    Assignee: Alcatel
    Inventors: Philippe Desprez, Gérard Barrailh, Damien Rochard, Stéphane Raël, Fadi Sharif, Bernard Davat
  • Supercapacitor balancing method and system
    Publication number: 20030062876
    Abstract: The present invention relates to a supercapacitor balancing method including bypassing the current flowing in the supercapacitor from a predetermined threshold voltage at the terminals of the supercapacitor, the bypass current being a function of the voltage at the terminals of the supercapacitor and increasing continuously as a function of the voltage.
    Type: Application
    Filed: June 17, 2002
    Publication date: April 3, 2003
    Applicant: ALCATEL
    Inventors: Philippe Desprez, Gerard Barrailh, Damien Rochard, Stephane Rael, Fadi Sharif, Bernard Davat
  • Supercapacitor balancing method and system
    Publication number: 20030020435
    Abstract: The present invention relates to a method of and a system for charging at least one supercapacitor that is particularly suitable for balancing supercapacitors.
    Type: Application
    Filed: June 17, 2002
    Publication date: January 30, 2003
    Applicant: ALCATEL
    Inventors: Philippe Desprez, Gerard Barrailh, Pascal Lavaur, Stephane Rael, Fadi Sharif, Bernard Davat