Source: https://patents.google.com/patent/US8084971B2/en
Timestamp: 2019-07-20 18:06:27
Document Index: 574568542

Matched Legal Cases: ['§119', '§365', 'Application No. 2005', 'Application No. 03028941', 'Application No. 2005', 'Application No. 200680038995']

US8084971B2 - Motor drive circuit and disc device using the same - Google Patents
Motor drive circuit and disc device using the same Download PDF
US8084971B2
US8084971B2 US12/090,910 US9091006A US8084971B2 US 8084971 B2 US8084971 B2 US 8084971B2 US 9091006 A US9091006 A US 9091006A US 8084971 B2 US8084971 B2 US 8084971B2
US12/090,910
US20090121665A1 (en
2005-10-20 Priority to JP2005305995A priority Critical patent/JP4860980B2/en
2005-10-20 Priority to JP2005-305995 priority
2006-10-19 Application filed by Rohm Co Ltd filed Critical Rohm Co Ltd
2006-10-19 Priority to PCT/JP2006/320834 priority patent/WO2007046461A1/en
2008-04-24 Assigned to ROHM CO., LTD. reassignment ROHM CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUWAMURA, MAKOTO
2009-05-14 Publication of US20090121665A1 publication Critical patent/US20090121665A1/en
2011-12-27 Publication of US8084971B2 publication Critical patent/US8084971B2/en
This is a U.S. national stage of application No. PCT/JP2006/320834, filed on 19 Oct., 2006. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2005-305995, filed 20 Oct. 2005, the disclosure of which is also incorporated herein by reference.
Patent Document 2: Japanese Patent Application, Laid Open No. H10-243685
While driving this type of sensorless motor, in order to reduce noise generated by the motor, it is desirable that the current flowing in each phase coil should gently vary.
The frequency measuring unit 32 includes a first counter 34 and a register 36. The first counter 34 counts a clock signal CK inputted from outside. The FG signal SigFG is inputted to the first counter 34, a count value CNT is reset each time a signal level thereof is switched, and counting is restarted. Each time the first counter 34 is reset, the register 36 holds the count value CNT by the reset time sequentially. The count value CNT held in the register 36 is equivalent to a period Tp of the FG signal SigFG. The period here is an interval between the edges of the FG signal SigFG. A relationship Tp=CNT×Tck holds between the count value and the period Tp. Here, Tck is a period of the clock signal CK. In this way, the period measuring unit 32 measures the period Tp of the FG signal SigFG.
The ramp setting unit 40 includes a second counter 42 and a table 44. The second counter 42 counts the clock CK. When a count value cnt′ of the second counter 42 is such that 0<cnt′<CNT×1/8, the pulse width of the first ramp signal Sslp1 is set to Tx1. When the count value cnt′ is such that CNT×1/8<cnt′<CNT×2/8, the pulse width of the ramp signal Sslp is set to Tx2. In the same pattern, when the count value cnt′ is such that CNT×(i−1)/8<cnt′<CNT×i/8, the pulse width of the first ramp signal Sslp1 is set to Txi.
The table 44 holds data x1 to x8, consisting the values of the pulse widths Tx1 to Tx8 converted to a clock count. That is, a relationship Tx=x1×Tck between the pulse widths Tx1 to Tx8 and the data x1 to x8 respectively holds. Here, Tck is a period of the clock signal CK. The data x1 to x8 are set such that a relationship x1>x2>x3> . . . >x8 holds.
US12/090,910 2005-10-20 2006-10-19 Motor drive circuit and disc device using the same Active 2028-09-18 US8084971B2 (en)
JP2005305995A JP4860980B2 (en) 2005-10-20 2005-10-20 Motor driving circuit and a disk apparatus using the same
JP2005-305995 2005-10-20
PCT/JP2006/320834 WO2007046461A1 (en) 2005-10-20 2006-10-19 Motor drive circuit and disc device using the same
US20090121665A1 US20090121665A1 (en) 2009-05-14
US8084971B2 true US8084971B2 (en) 2011-12-27
ID=37962554
US12/090,910 Active 2028-09-18 US8084971B2 (en) 2005-10-20 2006-10-19 Motor drive circuit and disc device using the same
US (1) US8084971B2 (en)
JP (1) JP4860980B2 (en)
CN (1) CN101292417B (en)
WO (1) WO2007046461A1 (en)
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2005-10-20 JP JP2005305995A patent/JP4860980B2/en active Active
2006-10-19 CN CN 200680038995 patent/CN101292417B/en active IP Right Grant
2006-10-19 US US12/090,910 patent/US8084971B2/en active Active
2006-10-19 WO PCT/JP2006/320834 patent/WO2007046461A1/en active Application Filing
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International Search Report for International Application No. PCT/JP2006/320834 mailed Jan. 23, 2007.
Japanese Office Action, Notification of Reason(s) for Refusal for Japanese Patent Application No. 2005-305995 dispatched Jun. 28, 2011 with English Translation.
Office Action issued for Chinese Patent Application No. 200680038995.4 with English translation issued Feb. 12, 2010.
Written Opinion of the International Searching Authority for PCT/JP2006/320834 mailed Jan. 23, 2007.
US20090121665A1 (en) 2009-05-14
JP4860980B2 (en) 2012-01-25
JP2007116828A (en) 2007-05-10
WO2007046461A1 (en) 2007-04-26
CN101292417B (en) 2011-03-23
CN101292417A (en) 2008-10-22
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KUWAMURA, MAKOTO;REEL/FRAME:020863/0255