Infrared remote control dimmer light circuit diagram

This circuit uses the KA2184 infrared receiving dedicated integrated circuit to produce an infrared remote control dimming lamp circuit as shown in the figure, in which the driving pulse generator for infrared emission is composed of NE555. The 40kHz pulse generated by the NE555 time base integrated circuit is amplified by the amplification transistor VT and then emitted outward by the SE303 infrared transmitter.

The infrared remote control receiving circuit is composed of KA2184. When the infrared receiving tube receives the remote control signal from the transmitter, pin 7 outputs a low level after being processed by KA2184. This low level is directly added to the base of VT to turn it on, and the current output by its collector forms a high level output at the upper end of R4. This high level is added to the auxiliary input terminal (pin 6) of the IS7232 dimming circuit through R6 as a dimming control signal.

After the 6-pin of the IS7232 integrated dimming circuit inputs the trigger signal, its 8-pin will continuously output the control pulse to control the conduction angle of the bidirectional thyristor, so that the conduction angle of the bidirectional thyristor changes between 410 and 1590. As the conduction degree of the bidirectional thyristor changes, the light also changes from dark to bright or from bright to dark, thereby achieving dimming of the light.

During the dimming process, when you need the light to change from dark to bright, you can press and hold the transmit button on the remote control to make it continuously send control signals. At this time, you can see that the lamp is gradually getting brighter. When the required brightness is reached, release the emission button immediately, and the brightness of the lamp will stay at this position. If you press it continuously, the light will gradually dim from bright to dark until it goes out.

It should be noted that IS7232 is a PMOS type integrated circuit, so its power supply polarity is opposite to that of commonly used CMOS circuits, that is, its field power supply terminal should be connected to the negative pole of the power supply, and its rose end should be connected to the positive pole of the power supply.

The circuit power supply in this example still uses AC power supply, capacitor step-down, and diode half-wave rectification. Different from other capacitor step-down power supply circuits, the power supply's step-down capacitor C6 is connected in parallel with a 220tH inductor instead of the resistor in the circuit introduced earlier. The function of this inductor is to absorb the harmonics generated by IS7232 and prevent them from interfering with other electrical appliances through the power line.

Component selection

The IC in the infrared transmitter should use time base integrated circuits such as NE555, VA555, LM555 or SL555; IC1 should use KA2184 infrared transmitting integrated circuit. IC 2 should use KA2184 infrared receiving integrated circuit. Its performance, parameters and pin functions are exactly the same as CX20106. , can be used directly interchangeably.

VTH uses ordinary small plastic packaged bidirectional thyristors, such as 1VI AC 94A4 or MAC 97A6 ; VS uses 12V, 0.5W silicon zener diodes, such as 2CW60-12V or 1N5242, 1N5242B, 1N6002, 2CW5242 or UZ-12B.

There are no special requirements for other components, and they can be selected according to the models and parameters indicated in the figure.