Patent ID: 7833322

Claim:
An air treatment apparatus, comprising: an electrode assembly comprising a plurality of emitter and collector electrodes; a voltage source coupled to the emitter and collector electrodes for establishing an electric field between the emitter and collector electrodes for producing ozone; a current sensing device coupled to the electrode assembly for measuring current flowing through the electrode assembly; a voltage control device coupled to the current sensing device, the voltage control device comprising: a current input port configured to receive at least one current signal from the current sensing device; a control output port configured to send at least one voltage control signal to the voltage source in response to the received current signal; and a control unit operably coupled to the current input port and the control output port, wherein the control unit is configured to: determine a current value from the received current signal; determine a designated ozone production range out of a plurality of ozone production ranges of the air treatment apparatus based on the current value; and provide an appropriate voltage control signal for adjusting the voltage source so as to regulate ozone production by the air treatment apparatus within the designated range.