Refrigerator automatic deodorizer circuit diagram

3528 ice blue

Photocoupler

Refrigerator automatic deodorizer

The conventional refrigerator "deodorizer" utilizes the porous adsorption of activated carbon to adsorb the odor in the refrigerator. This deodorizer has no bactericidal effect and requires frequent replacement of activated carbon or the entire finished product, which is inconvenient to use and increases economical expenditure. Here is an electronic deodorizer that can automatically remove the odor of the refrigerator. It uses a corona discharge to ionize the air, generating a large amount of air negative ions (mainly negative ions) and a certain amount of ozone. After diffusion, it can quickly remove the odor and keep it. The original flavor of the food prevents cross-stringing. The same ozone is a strong oxidant, with strong sterilization and disinfection functions, and negative oxygen ions can also inhibit the biochemical processes inside vegetables and fruits, and play a certain role in preservation. The electronic deodorizer integrates functions such as deodorization, sterilization and preservation, and has the characteristics of simple circuit, convenient use, and low consumption of electrodes (about 1W). Therefore, it is very suitable for amateurs to make and use. Reference for home appliance manufacturers.

working principle

The device is mainly composed of a light control, a delay circuit and a negative ion generator. The operation of the device is controlled by the illumination inside the refrigerator. When the refrigerator is opened to take food, the illumination light is on, the photocell VT1 is turned on, the time base circuit IC12 pin is momentarily low, the 3 pin immediately outputs a high level, the bidirectional thyristor VS is triggered to conduct, and the negative ion generator starts to work. . The working voltage of the light control and delay control circuit is provided by 220V AC through C1 step-down, VD1 rectification, VDW regulation and C2 filtering. While the negative ion generator is working, the DC power supply is charged via R2 via capacitor C3. When the voltage across C3 reaches 2/3 supply voltage, 3 feet return to low level, thyristor VS is turned off, and negative ion generator stops working. The charged capacitor of C3 is quickly discharged through the discharge tube in the IC. In this cycle, every time the refrigerator door is opened, the deodorizer will automatically work for 8-10 minutes. Change the value of R2 to adjust the length of the delay time.

The working principle of the negative ion generator circuit is relatively simple. After the VS is turned on, the 220V AC is rectified and current-limited by VD2, VD3, R4, and R5, and the unidirectional ripple current controls the turn-on and turn-off of the VS to generate oscillation. T boost, VD4 rectification produces a negative high voltage of tens of thousands of volts, which discharges to the air and discharges the air to generate negative ions. R6 is a protective resistor designed to prevent electric shock.

Component selection and production

See the attached table for component selection. No. Name Model number R1 Resistance 20K 1 R2 Resistance 1M 1 R3 Resistance 240Ω 1 R4 Resistor 22K 1 R5 Resistor 27K 1 R6 Resistor 2-4M 1 C1, C5 Metallized paper dielectric capacitor 0.1u/400V 2 C2, C3 Electrolytic capacitor 220u/ 25V 2 C4 Polyester Capacitor 0.01u 1 VD1-VD3 Rectifier Diode IN4007 3 VD4 Silicon Stack 18kV 1 VDW Zener Diode 2CW21H 1 VT1 Phototransistor TLP107 1 VS1 Triac 1A/400V 1 VS2 Unidirectional SCR 1A/400V 1 IC1 time base IC NE555 1 T switch transformer homemade.

The transformer T can be modified by a 35cm black and white TV line output transformer, and all the low-voltage winding coils are removed. Another Φ=0.35mm enameled wire or wire wrapped wire is used for 28匝 as L1, and the original high-voltage package is L2. If the integrated line output transformer is used for restructuring, the whole machine is smaller. The discharge needle is replaced by two push pins. The tip of the nail should be sharpened with a serrated knife to facilitate the tip discharge. All components can be installed in a plastic case as small as possible, and the AC output line is connected to two points A and B of the lighting control circuit in the temperature control box. The whole machine can be placed under the control box, the photoelectric tube is aligned with the illumination inside the refrigerator, and the deodorizer can work automatically under the control of the illumination lamp.