Plasma sterilizing-purifying device and method for air sterilizing and purifying

Plasma air sterilizing and purifying device, comprising:

• a plasma reactor (1), a pulse power supply (2), a fan component (3), a control unit (4), an air inlet (5), an air outlet (6), a power adaptor (7) and a housing case (8), wherein an air filter (10) is installed at the air inlet (5) and an air filter (9) is installed at the air outlet (6);
• wherein the plasma reactor (1) is provided with positive electrodes (101) formed by several nickel-chromium alloy wires or nickel-chromium alloy belts which are arrayed at an equal interval on the same plane, and each positive electrode (101) is positioned at the middle between two adjacent negative electrodes (102);
• the two ends of the positive electrode (101) are fixed on the corresponding grooves on a micro-discharge preventive conductor rail (103), the two ends of the micro-discharge preventive conductor rail (103) are fixed and electrically connected with four positive electrode metal supports (104) which are installed on the four sides of the reactor orthogonally;
• the upper and lower ends of each positive electrode metal support (104) are respectively provided with an insulation connection (105) fixed in a corresponding mounting hole on the reactor housing (108);
• the upper and lower ends of the negative electrodes (102) are directly fixed on and electrically connected with the reactor housing (108) made of metal;
• an EMC filter (201), a rectifier circuit (202), a filter circuit (203), a digital control circuit (204), a pulse generator (205) and a pulse transformer (206) are installed in the pulse power supply (2) and electrically connected in turn, and the output end of the pulse transformer (206) is externally connected with a plasma reactor (207);
• the output end of the pulse generator (205) is provided with a current detecting circuit (208) to send the detected current signal output from the pulse generator to an oscillator, an error amplifier and a PWM comparator in the digital control circuit (204), and the current signal is converted into a digital control current and then sent to the input end of the pulse generator (205);
• the dotted terminals a1 and a2 and unlike terminals b1 and b2 of a primary coil (214) and a secondary coil (215) of the pulse transformer (206) are arranged transversely;
• the secondary coil (215) is formed by at least two wound segments which are connected in series, and the upper end of each segment is provided with a high-voltage fast-recovery diode (217);
• an insulation-grade field-effect transistor switch Q1 is installed in the pulse generator (205), a source electrode is connected with the dotted terminal a1 of the primary coil (214), a grid electrode is connected with the output end of an integrated circuit IC1 in the digital control circuit (204) via a resistor R4, and the source electrode is connected with a resistor R5 in the current detecting circuit (208).