Patent Number: 6,674,258

Title: Motor driver and motor drive method

Abstract: A motor driver having output circuits each including upper and lower side switching elements connected in series. The motor driver includes: a current detection resistance connected in series with the output circuits in common; a phase switch circuit for turning ON a switching element on one side of one of the output circuits for a time period corresponding to a predetermined electrical angle and switching switching elements on the other side of a plurality of output circuits among the remaining ones of the output circuits; and an ON-period control section for generating a signal for controlling the switching operation so that each of periods obtained by dividing the time period includes a first period in which a plurality of switching elements are turned ON and a second period in which one of the switching elements turned ON in the first period is kept ON.

Inventors: Sakai; Hirofumi (Nagaokakyo, JP), Yokouchi; Tomoharu (Takatsuki, JP), Yamamoto; Yasunori (Hirakata, JP), Inao; Masashi (Kyoto, JP), Iwanaga; Taishi (Nagaokakyo, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H02P 6/00 (20060101); H02P 6/10 (20060101); H02P 6/08 (20060101); G05B 011/28 ()

Expiration Date: 01/06/2021