Electricity: motive power systems – Constant motor current – load and/or torque control – Control of motor load or device driven
Reexamination Certificate
2006-11-21
2006-11-21
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
Control of motor load or device driven
C323S315000, C323S317000
Reexamination Certificate
active
07138778
ABSTRACT:
A current sensor has a power MOSFET Q1, connected between an electric load and a power supply, for controlling current that flows through said electric load, a mirror MOSFET Q2, connected in parallel to said power MOSFET Q1, in which a portion of the current flowing through said power MOSFET flows, and a current detection resistor RC connected between a source electrode of said power MOSFET and a source electrode of said mirror MOSFET. An inverting amplifier circuit CP of the current sensor3inverts and amplifies the voltage signal, which has been converted to voltage by the current detection resistor RC, and outputs the signal, thereby converting positive and negative voltages generated across the current detection resistor RC to a positive voltage.
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Fujino Shin-ichi
Goto Kohsei
Innami Toshiyuki
Sakano Junichi
Crowell & Moring LLP
Ro Bentsu
LandOfFree
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