Circuit Operation Principle The infrared automatic hand washing circuit consists of a power supply circuit, an infrared transmitting circuit, an infrared receiving circuit and a control circuit, as shown in Figure 9-121.
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The power circuit is composed of a fuse FU, a power transformer T, a rectifier bridge stack UR, a filter capacitor Cl, C2, and a three-terminal voltage regulator integrated circuit IC1.
The infrared transmitting circuit is composed of a time base integrated circuit IC2, a potentiometer RP, resistors R1, R2, capacitors C3, C4 and an infrared light emitting diode VL.
The infrared receiving circuit is composed of an infrared photodiode VD1, resistors R3 and R4, capacitors C5-C7 and an infrared receiving integrated circuit 1C3.
The control circuit is composed of resistors R5-R8, diodes VD2, VD3, non-gate integrated circuits IC4 (D1, D2), transistor V and relay K.
After the AC 220V voltage is stepped down by T, UR rectified, Cl filtered, and ICl regulated, it provides 9V DC working voltage for the infrared transmitting circuit, infrared receiving circuit and control circuit.
The multi-vibrator composed of IC2 and RP, Rl, C3, and C4 is energized and oscillated to generate an oscillation signal of 38 kHz from the output of pin 3 of IC2, and RGB is driven by R2 to emit modulated infrared light.
Usually, VDl can not receive the infrared light emitted by VL, IC3's 7-pin output high level, so that non-"Dl output low level, D2 output high level, V cutoff, K is in release state, electromagnetic water valve W does not jobs.
When someone approaches the hand washing device, the infrared light emitted by the VL is reflected back by the human body, and the VD1 receives the reflected infrared light and converts it into a corresponding electrical signal, which is processed by the IC3 internal circuit, from the 7th pin of the IC3. Output low level, make non-gate Dl output high level, non-gate D2 output low level, V saturation conduction, K power-on, its normally open contact is connected, YV is energized to discharge water. When the person leaves the hand washing device, the 7th pin of IC3 outputs a high level again, V is cut off, K is released, and YV stops working.
Adjusting the resistance of the RP can change the sensitivity of the infrared control.
Component selection
Rl-R8 uses 1/4W metal film resistor or carbon film resistor.
RP uses ultra-small solid potentiometers or variable resistors.
Cl selects aluminum electrolytic capacitors with a withstand voltage of 25V; C2, C5, C6 and C8 select aluminum electrolytic capacitors with a withstand voltage of 16V; C3 and C7 select high-frequency ceramic capacitors; C4 selects polyester capacitors or monolithic capacitors. .
UR selects the rectifier bridge stack of lA and 5OV.
V selects S8550 or 3CG8550 silicon PNP transistor.
IC1 selects LM7809 type three-terminal voltage regulator integrated circuit; IC2 selects NE555 type time base integrated circuit; IC3 selects CX2O106 infrared receiving integrated circuit; IC4 selects CD4069 type six non-gate integrated circuit.
T selects 3W, the secondary voltage is l2V power transformer.
K selects JRX-l3F type 9V DC relay.
YV selects 220V AC electromagnetic water valve.
