Water dispenser (Aucma) temperature detection control circuit

Water dispenser (Aucma) temperature detection control circuit

Shown is the temperature detection control circuit of the water dispenser (Aucma). The water dispenser is also composed of two parts. One part is the heating
control circuit; the other part is the fresh-keeping cabinet control circuit , which provides working power for the ozone generator to deodorize the food inside the fresh-keeping cabinet and
play a role in preserving freshness. The AC 220 V power supply supplies power to the ozone generator circuit
    from the L (live wire) end of the power supply through the fuse FU1, power switch K], door switch K2, and timer PT1 .
AC 220 V is rectified by a bridge rectifier circuit composed of VD4~VD7 diodes after passing through the R4 and CI anti-impact circuits
. After rectification, a DC voltage of nearly 300 V is formed to power the oscillation circuit. The oscillation circuit is composed of thyristor VT1, capacitor c2 and oscillation
high-voltage transformer Tl. When the power is turned on, the bridge rectifier circuit outputs a DC voltage and begins to charge the capacitor c2, causing
the voltage to rise. At the same time, the voltage of R5 and the voltage dividing point (the trigger terminal G of the thyristor VT) also rises. When the rising voltage reaches the trigger
voltage, the thyristor VT1 is turned on, the charge on the capacitor C2 is discharged, and the voltage between AK and AK of the thyristor VT1 suddenly decreases and is cut off.
Then the bridge rectifier circuit charges cz again, and the G terminal voltage of thyristor TV1 rises again, causing thyristor VT1 to conduct and discharge again.
By continuously repeating this charging and discharging process, the circuit oscillates, so the secondary of the high-voltage transformer T1 gets an oscillating high voltage to
supply power to the ozone tube 03. The ozone tube 03 works to generate ozone to sterilize the food in the fresh-keeping cabinet.
    The fresh-keeping indicator light is used to display the working status of the fresh-keeping cabinet. When the power switch K] and the door switch K2 are both closed, turn on
the timer PT1 and set the fresh-keeping time. When the ozone generator starts to work, the fresh-keeping indicator light LED3 is lit; when the time of timer PT1
reaches zero, or the door switch is opened during the preservation process, the preservation circuit will be disconnected, the ozone generator will stop working, and the preservation light will be
extinguished.