The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2014
Filed:
Dec. 17, 2010
Ryotaro Miura, Nukata-gun, JP;
Tsuneo Maebara, Nagoya, JP;
Yusuke Shindo, Nagoya, JP;
Junichi Fukuta, Anjo, JP;
Junichi Nagata, Okazaki, JP;
Ryotaro Miura, Nukata-gun, JP;
Tsuneo Maebara, Nagoya, JP;
Yusuke Shindo, Nagoya, JP;
Junichi Fukuta, Anjo, JP;
Junichi Nagata, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
A drive device has a break circuit. The break circuit inputs phase-current values transferred from phase-current sensors mounted on an electrical path of a motor generator. A power switching element is equipped with a freewheel diode connected in parallel with each other. An inverter has pairs of the power switching elements. In each pair, the power switching element in a high voltage side and the power switching element in a low voltage side are connected in series. It is detected for the freewheel diode to be in a freewheel mode when a forward current flows in the freewheel diode. The break circuit detects the freewheel mode where the current flows in the freewheel diode in a lower arm when the phase-current value is not less than a predetermined threshold value. The break circuit detects the freewheel mode where the current flows in the freewheel diode in an upper arm when the phase-current value is not more than the threshold current value.