Patent ID: 9564289
Date: 2017-02-07
CPC Classifications: H01J

Claim:
1. An ion implanter comprising: a high-voltage power supply; a control unit that generates a command signal controlling an output voltage of the high-voltage power supply; an electrode unit to which the output voltage is applied; and a measurement unit that measures an actual voltage applied to the electrode unit, wherein the control unit includes: a first generation section that generates a first command signal for allowing the high-voltage power supply to output a target voltage; a second generation section that generates a second command signal for complementing the first command signal so that the actual voltage measured by the measurement unit becomes the target voltage or a voltage close to the target voltage; and a command section that brings to the high-voltage power supply a synthetic command signal which is produced by synthesizing the first command signal and the second command signal, wherein each of the first generation section and the second generation section includes a D/A (Digital to Analog) converter that converts a digital command value into an analog command signal, and wherein the command section brings to the high-voltage power supply the synthetic command signal which is produced by synthesizing the first command signal obtained by D/A-converting a first command value corresponding to the target voltage and the second command signal obtained by D/A-converting a second command value corresponding to a voltage value for complementing the actual voltage into the target voltage or the voltage close to the target voltage.