| 摘要 |
A level shifting and scaling circuit is provided to enable a microcomputer to recognize a change of a sensor output value by scaling and inputting a level of a resolution output to the microcomputer. A level shifting and scaling circuit includes a voltage follower, an offset remover unit, and a level shifting unit. The voltage follower scales a current value from an output of a current measurement sensor. The offset remover unit removes the offset value of the current measurement sensor from the output of the voltage follower. The level shifting unit shifts a level of the signal of which an offset value is removed. The voltage follower has an operational amplifier which receives an output of the current measurement sensor through a non-inverse terminal and feedbacks an output signal to an inverse terminal. The offset remover unit is composed of a zener diode coupled to the output terminal of the operational amplifier. |
