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New neutralizing current sensor for AC corona ionizer was proposed and investigated. The sensor can extract the neutralizing current by canceling the static induction current. Both the positive and the negative conduction currents can be measured independently by the proposed sensor.
Two types of sensing system for ion balance control were proposed and investigated base on the potential measurement and the current measurement. Their detection limits of ion balance were below 100 mV for each type. The response time tau of the current measurement type was 5 times shorter than the potential measurement type.
We propose an electrostatic control system that consists of a space charge balance sensor, a control circuit, a control ring and an AC corona discharge air ionizer. This electrostatic control system can maintain the final voltage at less than sub 1.0 V in spite of the very simple structure.
The MOSFET ionizer balance sensor presented in this paper displays ten times better signal-to-noise (S/N) ratio than the standard charged plate monitor (CPM). The sensor also has higher spatial and voltage resolution, which qualifies it for use in the accurate sensing and monitoring of the operation of the air ionizers.
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