Patent ID: 6265835
Filing Date: 2001-07-24
Classification: A61L,C02F,H05B

Abstract:
In a fluid purification system in which fluid flowing in a path is subjected to ultraviolet (UV) energy, the improvement comprising:a fluid flow rate sensor for measuring the fluid flow rate of fluid flowing in said path and producing a fluid flow rate control signal,an ultraviolet (UV) source positioned in said path, said UV source having a UV lamp and a square-wave alternating-current driver current connected to said UV lamp to non-thermionically start and operate said lamp with a square-wave alternating-current voltage having a frequency in the range of 75 kHz to about 1.5 MHz,a controller connected to said ultraviolet source and said flow rate sensor for proportionately controlling the intensity of ultraviolet energy emitted in said path by said intensity control as a function of said control signal.