Home telemechanics on a network of 220 volts. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Home telemechanics on a network of 220 volts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electronics in everyday life

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The device shown in the diagrams allows you to send control signals through the in-house AC lighting network. From the home control panel, you can turn on and off various household electrical and radio appliances, open the front door or garage gate, etc. The control panel can be both stationary and portable. The transmitter and receiver are connected to the AC mains sockets inside the apartment.

Operating principle is explained in Fig. 1. The frequency of the control signals is selected within 1...10 or 60...140 kHz.

Home telemechanics on a network of 220 volts
Fig. 1

The higher the control frequency, the stronger the harmful effect of the capacitance and inductance of the wiring. It is not allowed for transmitter signals to penetrate outside the apartment (house). In order not to violate the rules, appropriate chokes and filters are included in the network. Experience has shown that with a control frequency of 1 ... 2 kHz, the role of an anti-interference filter is played by an apartment electric meter. There is no interference with radio or television reception.

Do not use control signals with a frequency exceeding 100 kHz. It should also be added that the less the home electrical network is loaded, the better the operating conditions of the control device.

Transmitter (Fig. 2) is a transistor self-oscillator. Coil L1 has 500 turns of PEV or PEL 0,1 wire and is wound on a ferrite rod from a magnetic antenna with a diameter of 8 ... 10 and a length of 50 ... 100 mm. Tr1 - ringing or incandescent transformer; B1 - call button.

Home telemechanics on a network of 220 volts
Fig. 2

Coils L1, L2 receiver (Fig. 3) contain 200 turns of PEV 0,1 wire and are wound on an armored ferrite core with a diameter of 18 and a height of 11 mm or 500 turns of the same wire, but wound on a ferrite rod from a magnetic antenna (6 ... 10 X 50...100 mm); Tr2 - ringing transformer; Relay P has contacts capable of interrupting a power of 50 W.

Home telemechanics on a network of 220 volts
Fig. 3

The case of both devices with dimensions of 50x100x150 mm is made of plastic and shielded.

By adding resonant circuits, you can get a multi-channel device. As transistors, you can use any low-power silicon transistors of direct conduction, for example, KT361.

Publication: cxem.net

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