Ozone sterilizer eight

Photocoupler

Circuit Operation Principle The ozone sterilizer circuit consists of a power supply circuit, a timing control circuit, and an ozone generator circuit, as shown in Figure 9-105.

The power circuit is composed of a power switch S, a step-down capacitor C8, a resistor R6, R7, a Zener diode VS, a rectifier diode VDl, a filter capacitor C1, and a power source indicating LED VL.
The timing control circuit is composed of a timer integrated circuit ICl, a counter/pulse divider integrated circuit IC2, transistors Vl, V2, resistors Rl-R3, a potentiometer RP1, capacitors C3, C4 and diodes VD2-VD8.
The ozone generator circuit is composed of a time base integrated circuit IC3, resistors R4 and R5, a potentiometer RP2, capacitors C5-C7, a step-up transformer T and an ozone tube VG.
Turn on the power switch S, AC 220V voltage through C8 step-down, VS voltage regulation, VDl rectification and Cl filter to generate +l2V voltage, one way to supply the timing control circuit; the other way to VL after the R7 current limit buck.
The oscillating signal generated by the ICl internal oscillator (composed of ICl and Rl, RPl, C3) is divided by 12 stages of the internal frequency divider and output from the 2 pin. The signal is divided by IC2 and the VI and V2 are intermittent. Conduction (conducting 2Omin, cut off for 5min), the ozone generator circuit is intermittently energized. When Vl and V2 are turned on, the high frequency oscillator composed of IC3 and RP2, R4, C6, and C7 oscillates, and the high frequency oscillation signal with a frequency of 3OkH is output from the 3 pin of IC3, and the high frequency oscillation signal passes through V3. After amplification, it is applied to the primary winding of T, and a pulse high voltage is generated on the secondary winding of T, and VG generates ozone gas under the action of pulse high pressure.
When the timing time ends, Vl and V2 are turned off and the ozone generator stops working.
Adjust the resistance of RPl to change the timing time and working interval.
Changing the resistance of RP2 changes the operating frequency of the high frequency oscillator (making the frequency 3OkHz).
Component selection
Rl-R7 uses 1/4W metal film resistor or carbon film resistor.
Both RPl and R-Tu are selected ultra-small synthetic carbon film potentiometers.
Cl uses CBB capacitors with a withstand voltage of 450V; C2 and C5 select aluminum electrolytic capacitors with a withstand voltage of 16V; C3, C4 and C7 use monolithic capacitors or polyester capacitors; C6 uses high-frequency ceramic capacitors or glass-glazed capacitors. .
VDl selects 1N4007 type silicon rectifier diode; VD2-VD8 selects 1N4148 type silicon switch diode.
VS selects silicon steady voltage diodes of lW and l2V, such as 1N4742.
VL selects φ5.mm light-emitting diode.
Vl selects S9013 or S9014 type silicon NPN transistor for use; V2 and V3 select 3DDl5 or DDO3 type silicon NPN high back pressure transistor.
ICl selects CD4060 type timer integrated circuit; IC2 selects CD4017 type decimal counting/pulse distributor integrated circuit, IC3 selects NE555 type time base integrated circuit.
T is wound using a ferrite core and a high-strength enameled wire: the primary winding is wound with a φ 0.76 mm enamel wire around 30-40 匝; the secondary winding is wound with a φ 0.1 mm enamel wire around 2500-3000 匝.
S selects 5A, 220V power switch.
VC uses a bipolar ozone tube.