| 摘要 |
PURPOSE: To automatically adjust the voltage at every initial operating time of a CPU of a centrifuge provided with a circuit for detecting the voltage regenerated on a converter at a damping time to eliminate an error occurring due to the secular change of a photocoupler, in the centrifuge for rotating a rotor charged with a sample by an induction machine and an inverter. CONSTITUTION: This overvoltage detection circuit is constituted by a relay 7 for switching an initial operating time of the CPU 11 and a detection operating time, a Zener diode 4 generating a reference voltage by turning on the relay, a buffer 5 for inputting a converter voltage, a constant current circuit 6 for converting voltage to current and the photocoupler 1 for separating a strong current part from a weak current part to input into an analog port of the CPU 11. |
