Adjustment of Uout of a transformerless power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Regulators of current, voltage, power
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The proposed device provides a larger adjustment range. Elements VT2, VT3, R3 R6 form an analogue of a zener diode with an adjustable stabilization threshold. It is connected between the storage capacitor C2 and the base of the key transistor VT1 - just like a conventional zener diode is included in a capacitor rectifier with a fixed output voltage.
When the resistance of the resistor R3 changes from the minimum value to the maximum, the stabilization voltage changes more than ten times. As a result, the output stabilized voltage can be set in the range from 2,8 to 32 V.
The output voltage in the specified range remains almost constant both under load and at idle. The difference between these values does not exceed 1%. This device is not afraid of short circuit. As VT2, transistors KT315V ... E, KT3102A, B can be used, as VT3 - KT361V..E.
Author: N. Tsesaruk, Tula; Publication: N. Bolshakov, rf.atnn.ru
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