Patent ID: 6703785
Filing Date: 2004-03-09
Classification: H01T

Abstract:
A negative ion generator for generating negative ions by electron emission into air, said negative ion generator comprising:a piezoelectric transformer operable to output a non-rectified AC high voltage; a rectifying circuit operable to generate a negative high voltage from the non-rectified AC high voltage from said piezoelectric transformer; a discharge electrode connected to said rectifying circuit and adapted to emit electrons; an oscillating circuit operable to generate a signal having a frequency in a neighborhood of a resonant frequency of said piezoelectric transformer for controlling a frequency of an AC voltage to drive said piezoelectric transformer; and an oscillation frequency controller operable to deviate the frequency of the signal of said oscillating circuit applied to said piezoelectric transformer from the resonant frequency of said piezoelectric transformer such that the negative high voltage applied to said discharge electrode is varied.