Ozone sterilizer

Circuit Operation Principle The ozone sterilizer circuit consists of a power supply circuit, a high frequency oscillator, and an ozone generating circuit, as shown in Figure 9-98.

The power circuit consists of timer Q, fuse FU, capacitor Cl, C2, inductive filter L, current limiting resistor Rl, R2, rectifier bridge stack UR, Zener diode VS, filter capacitor C3, C4, C8 and three terminals The voltage integrated circuit IC1 is composed.
The high frequency oscillator circuit is composed of a resistor R3, a pot, a potentiometer RP, diodes VD1, VD2, capacitors C6, C7, and a time base integrated circuit IC2.
The ozone generating circuit is composed of resistors R5, R6, a field effect thyristor VF, a step-up transformer T, a æ°– indicator light HL, and an ozone tube VG.
Turn on the timer Q, the fan motor (air pump) M is energized, and the AC 220V voltage is filtered by Cl, L, C2, threshold current, UR rectification and C8 filtering to generate a DC voltage of about 300V, which is directly supplied to the ozone generating circuit; After one way through R2 current limit, VS voltage regulation, C3 filtering, ICl secondary voltage regulation, provide +5V working voltage for high frequency oscillator.
The high-frequency oscillator oscillates after power-on, and outputs a rectangular wave signal with a frequency of 20-3OkHz from the 3 pin of IC2, so that VF operates in the switching state (intermittent conduction), and generates a pulse high voltage of about 3000V on the WZ winding of T. The pulsed high voltage is directly applied to the ozone tube VG, so that the VC generates a certain concentration of ozone, and then the ozone gas is discharged through a fan or an air pump. The pulsed high voltage is also illuminated by the R5 current limiting step.
When the timing time ends, the control of the timer Q is disconnected, and the working power of the whole machine is cut off.
Component selection
Rl selects lOW cement resistor for use; R2 selects 2W metal membrane resistor for use; R3-R6 selects 1/4W metal membrane resistor for use.
The RP uses a small synthetic carbon film potentiometer or a variable resistor.
Cl and C2 use polyester capacitors or CBB capacitors with a withstand voltage of 400V; C3 selects aluminum electrolytic capacitors with a withstand voltage of 25V; C4 and C7 use monolithic capacitors or polyester capacitors; C5 selects aluminum electrolytic capacitors with a withstand voltage of lOV C6 selects high frequency ceramic capacitor or CBB capacitor; C8 selects aluminum electrolytic capacitor with 400V voltage.
Both VDl and VD2 use the 1N4148 silicon switching diode.
VS selects silicon steady voltage diode of lW, l2V.
UR selects 3A, 600V rectifier bridge stack, and can also be replaced by 4 1N5406 bridges.
VF uses N-channel high-voltage field effect transistors, such as BUZ380.
ICl selects LM7805 or CW7805 type three-terminal regulator integrated circuit; IC2 selects NE555 or LM555 type time base integrated circuit.
L uses a high frequency inductive filter for electronic ballasts.
T uses UlO-type core and high-strength enameled wire winding: Wl winding is wound around 300匝 with φ0.32mm enameled wire, and W2 winding is wound with 30.5-3400匝 with φ0.09mm enameled wire.
Q uses a mechanical timer of 0-6Omin.
HL selects the common æ°– indicator.
VG uses high frequency ozone tanks or ceramic ozone tablets.
M can be used with small fans or small capsule air pumps for fish farming.