Patent ID: 7206182

Claim:
A circuit for generating negative ions comprising: a power indication circuit for displaying power on/off; an oscillation circuit including a transformer and an oscillation loop, the transformer being configured to generate a high voltage to produce a resonant frequency through the oscillation loop, the oscillation loop having a oscillation loop capacitor (C 3 ) and a transistor, the transistor having a base, a collector and an emitter, the base and the collector of the transistor being electrically connected to the transformer; an amplifying circuit connected with at least a discharge electrode, the amplifying circuit configured to rectify current flowing to the oscillation circuit and discharge negative ions through the discharge electrode; and a high frequency eliminating circuit having a eliminating capacitor (C 4 ) and a coil (L 2 ), the eliminating capacitor (C 4 ) being connected in series with the coil (L 2 ), and the coil (L 2 ) being connected to the emitter of the transistor in series, wherein the eliminating capacitor (C 4 ) and the oscillation loop capacitor (C 3 ), and the capacitance (C 3 ) of the oscillation loop are both electrically connected to the base of the transistor.