| 摘要 |
<p>PURPOSE:To eliminate influence of base current and the like by correcting the error due to base current portion of a second output transistor through offset correction in a current detecting amplifier. CONSTITUTION:A resistance 64 for offset is provided on a current detecting amplifier 6, and its one side is connected to a power supply terminal and the other side is connected to the reversal terminal of a computing amplifier 61. Hereby, in defection of the current value (ic) of an electromagnetic clutch 4, the error portion generated by the base current of an output transistor 13 or deexciting resistance current can be cancelled by the resistance 64 for offset. Namely, the resistance 64 is connected to the power supply terminal, and also offset correction can be performed in relation to resistances 62, 63 for computing.</p> |
