Importance

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Abstract

Positive and negative ion contents of the air within a region are controlled to suppress build-up of electrostatic charges on objects or for other purposes with one or more air ionizing units each having a positive high voltage generator coupled to a first ionizing electrode and a negative high voltage generator coupled to a second spaced apart ionizing electrode. The positive and negative high voltage generators are operated alternately with off times being provided between each period of ion generation of either polarity and the preceding period of generation of ions of the opposite polarity. The off times enable ions of each polarity to disperse outwardly for a controlled distance before substantial intermixing and mutual neutralization takes place. In the preferred form of the invention, the durations of the positive and negative ion generation periods, the off times between such periods and the rates at which each type of ion generation occurs during such periods are each separately controlled to accommodate to different ion requirements of different rooms or to changed conditions in a particular room.

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First Claim