Ozone sterilizer 11

This example introduces an ozone sterilizer circuit made of discrete components and ozone generators. It is actually an inverter circuit composed of a push-pull oscillation circuit, as shown in Figure 9-108.

Circuit Working Principle
The push-pull oscillation circuit is composed of transistors Vl, V2, oscillation transformer T2 (Wl-W3), pulse transformer T1, current-limiting resistor Rl, charging capacitor C3, double-question trigger diode VD5, etc.
The half-wave rectifier filter circuit is composed of filter inductor L, rectifier diode VDl, filter capacitors Cl, C2, etc.
When the power is turned on, the AC 220V voltage is filtered by L and rectified by VDl, and a voltage of about +280V is generated at both ends of Cl, which is supplied to the push-pull oscillation circuit.
At the moment of power-on, Vl is turned on, and due to the charging effect of C3, the bidirectional trigger diode VD5 is cut off. When the charging voltage across C3 rises to 32V, VD5 is triggered and turns on, causing V2 to turn on. During the conduction period of V2, C3 gradually discharges, causing V2 to cut off. After Vl is turned on, under the action of pulse transformer Tl, positive feedback voltages are generated on Wl and W2. This voltage is added to the bases of Vl and V2 respectively, causing Vl and V2 to turn on and off alternately (that is, when Vl is turned on, V2 is cut off; when V2 is turned on, Vl is cut off), and the push-pull oscillation circuit works in oscillation.
After the push-pull oscillation circuit operates, a high-voltage pulse is generated on the secondary winding W6 of the pulse transformer T1, causing the ozone generating chip VG to operate and generate ozone. At the same time, the light-emitting diode VL also lights up and works.
Component selection
Rl-R6 all use 1/8W metal film resistors.
VDl-VD4 and VD6 all use 1N4007 type rectifier diodes; VD5 uses DB3 type bidirectional trigger diodes.
Vl and V2 use high back-voltage silicon NPN transistors such as 2SC2653 or BU406.
For a magnetic core inductor coil with L of 5mH, 210 turns of φO.25mm enameled wire can be wound around the frame.
The pulse transformer Tl can be modified using a 14in (inch) black and white TV line output transformer. During modification, the high-voltage package is used as W6, 168 turns of φ0.45mm enameled wire are wound on the frame of the low-voltage package as W4, and φ0.23mm enameled wire is used to wind 4 The turns are W5 (wound on the outermost layer); Wl-W3 of T2 are wound on the same magnetic ring with φ0.2mm single-core plastic copper wire, in which Wl and W2 are wound with 3 turns respectively, and W3 is wound with 9 turns .
Ozone generator VG chooses Z-10, Z-15, Z-20 and other models.