| 摘要 |
PURPOSE:To simplify a circuit by A/D converting a current output signal in synchronization with ON and OFF pulses fed from a microcomputer to a chopper to be inputted to the microcomputer. CONSTITUTION:The current of a motor 3 is flowed to a shunt resistor 5, and the voltage across the resistor 5 is inputted to a current detector 6. The detector 6 has an amplifier A and an A/D converter and applies a digital value to a microcomputer 7 in synchronization with ON and OFF pulses fed to a chopper 2 from the microcomputer. The period that the A/D converter is occupied by the current amplifier A becomes short, and the excess period can be used to input other terminal inputs such as a voltage and a rotating speed. In this manner, many inputs can be A/D converted with a simple circuit and can be inputted to the microcomputer. |
