Coil load driving circuit and optical disc device

Details Coil load driving circuit and optical disc device Coil load driving circuit and optical disc device

2005-05-26

2009-12-08

Ro, Bentsu (Department: 2837)

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C318S291000, C318S293000

Reexamination Certificate

active

07630616

ABSTRACT:
A coil load driving circuit in which generation of radiation noise when a motor is stationary is minimized, includes output buffers that output a PWM pulse to both terminals of a motor; a transfer voltage generating circuit that outputs transfer voltages VTR1, VTR2proportional to the difference between an input control voltage VINand input reference voltage VREF; PWM comparators that output PWM signals PW1, PW2corresponding to the transfer voltages VTR1, VTR2; and an output PWM pulse synthesis circuit that controls the output buffer in accordance with an AND signal of the PWM signal PW1and an exclusive OR signal EX of the PWM signals PW1and PW2, and controls the output buffer in accordance with an AND signal of the PWM signal PW2and the exclusive OR signal EX.

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International Search Report issued in corresponding International Patent application No. PCT/JP2005/009608, mailed Aug. 16, 2005.

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