The invention relates to an athermal
plasma purifying unit, belonging to the technical field of air sterilization and purification. The athermal
plasma purifying unit comprises a
plasma reactor, a pulse power source, a fan
assembly, an air inlet, an air outlet, a power source coupler and an outer case. A positive
electrode comprising a plurality of
nickel-
chromium metal wires or
metal straps is arranged in the reactor, and both ends of the positive
electrode are fixed in corresponding grooves or protrusions on a conductor rail for preventing micro
discharge. The pulse power source is providedwith a
digital control circuit, an oscillator, an
error amplifier and a PWM (Pulse-Width Modulation)
comparator are arranged in the
digital control circuit, and the operating current of the
plasma reactor is converted into a
digital control current to control the width of an output pulse. The invention effectively stops the micro
discharge phenomenon of the reactor and prolongs service life, and the high-
voltage pulse current can increase the concentration of the plasma, can improve air sterilization and purification efficiency and can save energy. The athermal plasma purifying unit can be widely applied to places having high requirements for cleanness, such as factory clean rooms, hospital operating rooms, isolation wards and the like, and can also be applied to the air sterilization andpurification of places such as office buildings, theatres, trains, automobiles, subways and the like.