Lamp brightness control. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Lighting

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The proposed device uses the so-called phase-pulse method of regulating the average current through the load. It changes due to the fact that the load-lamp is connected to the network not directly, but by an electronic key some time after the next half-wave of the mains voltage appears. By changing this time, the power consumed by the load from the network can be adjusted from almost zero to a maximum. For a lamp lamp, this means changing the brightness of its glow.

When the contacts of the switch S1 are closed, the lamp L1 does not turn on immediately, but smoothly, depending on the capacitance, the capacitor C2. This increases the life of the lamp itself, as we know that lamps usually burn out when turned on - a sudden connection of voltage.

Lamp L1 (220V 100W) is actually a lamp. All resistors are 0,25W except for R8 which is 2W. When mounting, place this resistor 2mm above the board surface so that the rest of the parts do not heat up. Film capacitor C1, trinistor KU202L can be replaced with KU202K, KU202M, KU202N. Observe the conditions for its inclusion in the circuit. Connect incorrectly - will not work.

Be sure to drill holes for ventilation in the case in which you will place the device. elements R8, VS1 heat up during operation.

Publication: rp.butovonet.ru

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