发明名称 Current detection circuit, motor driving device, magnetic disk storage device, and electronic appliance
摘要 A current detection circuit for detecting a maximum current value in a three-phase motor includes an identifier configured to identify a maximum current phase having the maximum current value among phases of the motor, and a detector configured to detects the maximum current value by summing current values of phases other than the maximum current phase when the current direction in the maximum current phase is a predetermined first direction.
申请公布号 US9052344(B2) 申请公布日期 2015.06.09
申请号 US201414264558 申请日期 2014.04.29
申请人 Rohm Co., Ltd. 发明人 Yoshiya Takashi
分类号 G11B19/20;G01R19/30;H02P3/14;G11B19/28 主分类号 G11B19/20
代理机构 Fish & Richardson P.C. 代理人 Fish & Richardson P.C.
主权项 1. A motor driving device comprising: a current detection circuit for detecting a maximum current value in a three-phase motor; a power supply line; and a motor drive unit configured to perform drive operation for driving the three-phase motor using a voltage supplied to the power supply line and synchronous rectifying operation for generating a rectified voltage from phase voltages of phases generated when the three-phase motor idles so that regeneration occurs in the power supply line, wherein the motor drive unit includes: three-phase upper switches for switching connection/disconnection between each phase of the three-phase motor and the power supply line; andthree-phase lower switches for switching connection/disconnection between each phase of the three-phase motor and a ground point, and wherein the current detection circuit includes: an identifier configured to identify a maximum current phase having a maximum current value among phases of the motor during motor brake during which the three-phase lower switches are all on; anda detector configured to: detect the maximum current value by adding current values of phases other than the maximum current phase when a current direction in the maximum current phase is a predetermined first direction anddetect a current value of the maximum current phase as the maximum current value when a current direction in the maximum current phase is a second direction opposite to the first direction.
地址 Kyoto JP