Chandelier control by two wires. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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There are a lot of schemes for controlling a chandelier over two wires. The scheme presented here is distinguished by its simplicity, which means that it is accessible and small in size. It is completely placed in the decorative cap of the chandelier.
The principle of operation of the circuit is as follows
When the chandelier is first turned on, the temperature of the thermistor R2 is equal to the ambient temperature and its resistance is relatively high, the voltage on the relay exceeds the response voltage, and it opens the power circuit of the HL1-HL3 lamps with its contacts. After a few seconds, the resistor R2 is heated by the current passing through it and its resistance decreases, the voltage across the relay drops to the value U1, which should be slightly higher than the holding voltage, but always less than the trigger voltage. If now for a short time (0,5 - 1,5 s) the power to the chandelier is turned off, the resistor R2 will not have time to cool down and the next time it is turned on, the voltage on the relay will be less than its response voltage, the contacts will remain closed, and all six lamps will be connected to the network. To switch the device back to the "half" power-on mode, you need to turn off the power for the time required for the thermistor to cool (2 - 3 seconds). The circuit is built into a chandelier with six 40 W lamps and has been working flawlessly for about ten months.
The following details were used in the scheme. Relay K1 is a small-sized relay with a winding resistance of about 300 ohms, an actuation voltage of 7 V and a release voltage of 3 V (it is advisable to choose a relay with the largest hysteresis). resistor R2 - three ST3-17 thermistors connected in parallel with a resistance of 1 kOhm each (there was simply no one suitable at hand). Resistor R1 type MLT-0,25 with a resistance of several tens of ohms may be needed to set the voltage on the relay (in a steady state heated) a little more than the holding voltage. Diode assembly used type KTs407A. Capacitor C1 - 50uF x 16V. All parts are surface-mounted on the relay outputs.
Author: A. Nazarov (RA4UEL), Saransk; Publication: N. Bolshakov, rf.atnn.ru
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