Current sensor using mirror MOSFET and PWM inverter...

Electricity: motive power systems – Constant motor current – load and/or torque control – Control of motor load or device driven

Reexamination Certificate

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Details

C323S315000, C323S317000

Reexamination Certificate

active

07112935

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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