ALEXANDRIA, Va., May 5 -- United States Patent no. 12,620,647, issued on May 5, was assigned to TOYOTA JIDOSHA K.K. (Toyota, Japan).
"Battery system" was invented by Hirotsugu Ohata (Susono, Japan), Wan Leng Ang (Susono, Japan) and Shinya Asaura (Numazu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The DC power of the battery is converted into AC power by an inverter to drive a motor generator (MG). The control ECU executes the temperature raising control at the time of low temperature of the battery. During the temperature raising control, the control ECU sets the carrier frequency of the inverter to the resonance frequency of the battery circuit including the battery. The frequency of the switching...