Title:
ボイスコイルモータの駆動回路およびそれを用いたレンズモジュールおよび電子機器、ボイスコイルモータの駆動方法
Document Type and Number:
Japanese Patent JP6385076
Kind Code:
B2
Abstract:
A driving circuit for controlling a driving current is provided. A D/A converter has a precision of N bits and outputs a control signal for a driving current to a current driver. A logic unit receives input control data of M bits (M>N) and outputs intermediate control data of N bits to the D/A converter. A data extraction unit divides the input control data into a first data having N bits from the MSB and a second data having (M−N) bits from the LSB. A counter accumulatively adds the second data to generate a count. A carry detection unit asserts a carry signal when a carry at the MSB of the count is generated by the counter. An output control unit 66 converts the intermediate control data into the first data or a third data, in which 1 LSB is added to the first data, according to the carry signal.
Inventors:
Tatsuya Ninomiya
Application Number:
JP2014041520A
Publication Date:
September 05, 2018
Filing Date:
March 04, 2014
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02P7/025; G02B7/04; G02B7/08; G03B5/00
Domestic Patent References:
| JP5101562A | ||||
| JP56024830A | ||||
| JP52066168A | ||||
| JP2009055756A | ||||
| JP2002358742A | ||||
| JP11150787A | ||||
| JP2008152851A | ||||
| JP59180733A |
Attorney, Agent or Firm:
Sakaki Morishita
Masaki Taiki
Masaki Taiki