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. 02, 2010
Filed:
Jul. 29, 2008
Takehiro Yano, Osaka, JP;
Tetsu Nagano, Osaka, JP;
Daisuke Fukuda, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
There are provided upper and lower switching elementsU toW andU toW for energizing motor drive windingsU toW, a control circuitthat starts outputting a control signal for energization based on an energization instruction, pre-drive circuitsU toW andU toW for controlling ON/OFF of the upper and lower switching elements based on the control signal, and short circuit detection circuitsU toW for detecting short circuits in a nodebetween the upper and lower switching elements to higher-potential and lower-potential power sources based on the control signal and a voltage of the node. The short circuit detection circuits are controlled to detect a short circuit in the node to the lower-potential power source with all the upper switching elements turned ON and all the lower switching elements turned OFF and to detect a short circuit in the node to the higher-potential power source with all the upper switching elements turned OFF and all the lower switching elements turned ON, in a state where the motor drive windings are not energized. It is possible to prevent a situation in which a short circuit cannot be detected depending on a resistance component of a drive target.