PDU - light switch. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Lighting

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In [1], the device for switching on the lighting using any remote control is described. However, in my opinion, the device has low noise immunity. When controlling household appliances with a remote control, the reflected signal enters the photodetector and causes false alarms. In addition, when the remote control button is pressed for a long time, the lighting lamp flashes at a frequency of about 5 Hz.

Figure 1 shows a device for remotely switching on lighting, free from these shortcomings. In the initial state (in the absence of commands from the remote control), capacitor C2 with a capacity of 0,47 ... 1,2 μF is charged to approximately a voltage of 4,5 V. When the DD1 LED is irradiated with a modulated IR signal, bursts of pulses appear at its output 1, which discharge capacitor C2 to a voltage of about 0,4 V (logic level "0"). After passing a burst of pulses, before the next one arrives, the capacitor has time to charge. Thus, at the input C (pin 3) of the element D2.1, a sequence of pulses appears, which causes the trigger to switch.

Fig.1. Schematic diagram of a device for remote lighting switching (click to enlarge)

A frequency divider by 2.1 (3.2) is assembled on elements D16 ... D24, which ensures the noise immunity of the device by introducing a switching delay of approximately 3 s.

Triggers D4.1 and D4.2 connected in series provide switching of lamps connected to the "RH1" and "RH2" terminals according to the algorithm:

R_H1-R_H1 + R_H2-R_N2 - all repaid (and further along the ring).

Time diagrams of the device operation are shown in Fig. 2 and 3.

Fig.2. Timing diagrams

Fig.3. Timing diagrams

LEDs HL1 and HL2 are used to indicate the health of the lamp supply circuit. When the lamp is off, the corresponding LED lights up. On the elements R1, R2, VD6, a parametric stabilizer is assembled, which is necessary to power the IC. Elements R6, C3 and R10, C1 form power decoupling filters for the analog and digital parts, respectively.

The current consumed by the device itself from the mains does not exceed 7...10 mA. The type of thyristors and diode bridge used depends on the current consumption of the lamps. When using the elements indicated in the diagram, the load power per channel should not exceed 180 W, and on both channels simultaneously - 300 W, while the GBH415A diode bridge must be installed on a heat sink with an area of ​​​​about 25 cm².

The load power inputs indicated above correspond to a five-lamp chandelier with 60 W lamps each. Capacitor C2 is selected for the corresponding remote control (if necessary). The larger the capacitance of the capacitor, the smaller the range of the remote control, but the higher the noise immunity. Figure 4 shows the printed circuit board of the device.

Fig.4. Printed circuit board

Structurally, the device is housed in a case made of a translucent soap dish.

Instead of IC K561TM2, K176TM2, 564TM2 are suitable. Photodetector IFMS5360 manufactured by NPO Integral can be replaced with TFMS5360, TFMS5380 from Philips. It is allowed to replace the imported diode bridge GBH415A only with diodes with a rated current of at least 4 A and a reverse voltage of at least 400 V (for example, KD202R).

The only drawback of the device is the impossibility of turning it on in the break of the lamp power wire, instead of the standard switch. However, this does not cause significant inconvenience when it is installed near the junction box, in which the wires leading to the switch and the chandelier are connected.

The circuit (Fig. 1) has a transformerless power supply from the mains, so care should be taken when setting up. It is best to test the circuit (without the power part) by connecting it to a 5...6 V power supply. Under no circumstances should it be connected to the ground!

Literature

1. Churuksaev M. Infrared switch. - Radiomir, 2002, N2, p.39.
2. Sokolov BC TV electronic control systems. - Radio and communication.
3. Urbanovich A.A. HORIZONT TVs. - M.: DNA, 2002.
4. Shilo V.L. Popular digital circuits. - Chelyabinsk, 1989.

Author: A.Filipovich, Derzhinsk, Minsk region; Publication: radioradar.net

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