Powerful voltage stabilizer, 5-30 volts 5 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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Shown in Fig. 3.15 version of the stabilizer provides an output voltage in the range of 5 ... 30 V at a load current of up to 5 A. In addition to the microcircuit and the regulating transistor, it contains a measuring bridge formed by resistors R2 ... R5, R7, and a comparator on the op-amp DA2.
The peculiarity of the bridge is that most of the load current flows through the resistor R7 included in it. The required output voltage is set by a tuning resistor R6, the current value (in this case 5 A), above which CH becomes a current stabilizer, by resistor R2. At a load current of less than 5 A, the voltage drop across resistor R7 is such that the input voltage of the op-amp DA2 is greater 0, so its output voltage is positive, the diode VD1 is closed and the comparator has no effect on the operation of the CH.
An increase in current to 5 A and a corresponding voltage drop across the resistor R7 lead to the fact that the input voltage of the op-amp DA2 first decreases to 0, and then changes sign. As a result, its output voltage also becomes negative, the diode VD1 and the LED HL1 open and the voltage at the output of the microcircuit is set at a level corresponding to a load current of 5 A. When the rated load is restored, the output voltage increases to the specified value.
A further decrease in the output current leads to the fact that the input, and then the output voltage of the op-amp again become positive, the diode VD1 closes and the device returns to the voltage stabilization mode.
Author: Semyan A.P.
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