Title:
制御駆動回路および制御駆動方法
Document Type and Number:
Japanese Patent JP4371387
Kind Code:
B2
Abstract:
A control drive circuit or the like is provided that is capable of producing a drive output of a higher voltage than a drive power source voltage. A differential amplifier 39 that constitutes a differential amplifying section 14 generates a current Ia on the basis of a current I0 obtained with a constant current generating section 12 and signal waveforms Vina and Vinb inputted from a signal source S. Currents I2 and I4 are generated with a pre-drive section 16. The current I2 corresponds to part of the current Ia that is greater than 1/2.I0 and smaller than 3/4.I0. The current I4 corresponds to part of the current Ia that is greater than 3/4.I0. In other words, part of the current Ia that is greater than 1/2.I0 is divided at the threshold value of 3/4.I0 to obtain the currents I2 and I4. Different coils are driven on the basis of the currents I2 and I4. A drive output of a higher voltage than a drive power source voltage is obtained by synthesizing the outputs produced with the coils.
Inventors:
Kiyoshi Nishimura
Application Number:
JP28593099A
Publication Date:
November 25, 2009
Filing Date:
October 06, 1999
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02P6/08; H02M7/49; H02P6/06; H03F3/45
Domestic Patent References:
| JP8023786B2 | ||||
| JP6067265B2 | ||||
| JP5070017U | ||||
| JP55179414U |
Attorney, Agent or Firm:
Eio Furuya
Tadashi Matsushita
Hiroaki Majima
Tadashi Matsushita
Hiroaki Majima