Nightlight brightness control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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In order to make a sconce or floor lamp with adjustable brightness, you need very few details.
See diagram in Figure 1.
Thyristor VS1 is controlled by a dinistor VD1. With each half-wave of the mains voltage, the capacitor C1 is charged through the resistor R1. When the voltage across the capacitor C1 rises to the turn-on voltage of the dynistor VD1, it will go into the open state. Thyristor VS1 opens, and capacitor C1 is discharged through the dinistor and the control input of the thyristor. By changing the resistance of the resistor R1, we change the charge time of the capacitor, and, consequently, the turn-on time of the thyristor. Thus, it is possible to regulate the load power from zero to Uc / 2 - Uvk. Where is the mains voltage, Uvk is the turn-on voltage of the dinistor. Since the thyristor opens only with a positive half-wave of voltage, the adjustment is made up to half the mains voltage. To turn on the full load, a regular lamp switch, shown in the figure by a dotted line, can serve.
The regulator shown in Figure 2 can adjust the voltage from zero to 100% minus the turn-on voltage of the dinistor. When switch SA1 is off, the circuit operates in the same way as described above. After turning on the switch SA1, one half-wave of voltage passes to the lamp HL1 through the diode VD1, and the supply of another half-wave of voltage is regulated by resistor R1. The voltage regulator according to the diagram in Figure 2 can be used to adjust the temperature of the soldering tip. In the latter case, switch SA1 can perform the function of switching on the standby mode.
With the maximum resistance of the resistor R1 and the switched off switch SA1, the circuit does not consume current, so an additional mains switch is not required. The dinistor can be supplied with any letter, but it will be necessary to select the value of the resistor R1, since the turn-on voltage of the dinistors is different.
Publication: cxem.net
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