| 摘要 |
PURPOSE:To eliminate the pulsating current due to excess output by providing an irreversible time constant circuit in which the time constants between charging and discharging are differentiated in a feedback loop, thereby preferably controlling a pulse motor by a slowup quickdown operation. CONSTITUTION:An irreversible time constant circuit provided between the output of a controller an the input of a V/F converter 4 connects in parallel a series circuits of the first diode D1 and the first resistor R7, and a series circuit of the second diode D2 and the second resistor R8 so that the direction of the diode become reverse. A capacitor C2 is connected between the input of the converter 4 and the ground. The discharging is accelerated by setting R7, R8 as a slowup quickdown operation. Accordingly, when applied to a chromatograph pump, the pulsation of a pump an be reduced, and high sensitivity analysis can be performed in the chromatograph. |
