Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2007-05-29
2010-06-08
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400010, C318S700000, C388S800000
Reexamination Certificate
active
07733045
ABSTRACT:
According to some preferred embodiments of the present invention, a motor driving circuit includes a phase detection circuit configured to detect a rotation phase of a motor and output a phase detection signal, a first amplifier configured to amplify the phase detection signal and output an amplified detection signal, and a second amplifier configured to amplify the amplified detection signal in accordance with a power supply voltage and output a driving signal to the motor. The motor driving circuit is further provided with a controlling circuit configured to detect the power supply voltage and increase/decrease amplitude of the amplified detection signal outputted from the first amplifier in response to an increase/decrease of the detected power supply voltage, whereby heat generation and noise generation can be restrained, irrespective of the increase/decrease of the power supply voltage.
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Korean Office Action, dated Sep. 29, 2008 (with partial English translation).
Goto Tomoyuki
Ogino Koichiro
Yoshitomi Tetsuya
Benson Walter
Luo David S
Sanyo Electric Co,. Ltd.
Watchstone P&D, PLLC
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