Stabilized power supply, 220/1-40 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The described power supply is assembled from available elements. It requires almost no adjustment, operates in a wide range of input AC voltage, is equipped with overcurrent protection.
The proposed power supply allows you to get a stabilized output voltage from 1 V to almost the value of the rectified voltage from the secondary winding of the transformer. A comparison unit is assembled on transistor VT1: a part of the reference voltage is supplied to the base from the variable resistor R3 engine (set by the reference voltage source VD5VD6HL1R1), and the output voltage from the R14R15 divider is supplied to the emitter. The mismatch signal is fed to the current amplifier, made on the transistor VT2, which controls the regulating transistor VT4.
When the output of the power supply is shorted or the load current is excessive, the voltage drop across the resistor R8 increases. The VT3 transistor opens and shunts the base circuit of the VT2 transistor, thereby limiting the load current. LED HL2 signals the activation of overcurrent protection. In the event of a short circuit, the switching on of the current limiting mode does not occur instantly. The inductor L1 prevents the rapid increase in current through the transistor VT4, and the diode VD7 reduces the voltage surge in case of accidental disconnection of the load from the power supply.
To regulate the current of protection operation in the open circuit between resistors R7 and R9, it is necessary to turn on a variable resistor with a resistance of 250 Ohms, and connect its engine to the base of the VT3 transistor. The current value can be adjusted from 400 mA to 1,9 A.
In the power supply, any transformer with a voltage on the secondary winding from 9 to 40 V is applicable. However, at a low voltage value, the resistance of the resistors R1, R2, R9, R13-R15 should be approximately halved and the zener diodes VD5, VD6 should be selected so that the voltage on resistor R1 was approximately equal to half the voltage across capacitor C2.
Choke L1 contains 120 turns of PEL 0,6 wire wound on a mandrel with a diameter of 8 mm. We will replace the KT209M (VT1) transistor with KT502 with any letter index, KT208 (F-M), KT209 (F-M), KT3107 (A, B). Instead of the KT815G (VT2) transistor, you can use any KT817 series or other similar structure with an allowable collector-emitter voltage of at least the supply voltage. Transistor VT4 - KT803A, KT808A, KT809A, series KT812, KT819, KT828, KT829 or any powerful one with an allowable collector current of at least 5 A and an allowable collector-emitter voltage greater than the supply voltage. Transistors VT2 and VT4 must be placed on heat sinks. Diodes VD1 - VD4 - any rectifier with a permissible forward current of more than 5 A and a reverse voltage of at least the voltage on the secondary winding of the transformer. LEDs can be of any type.
Author: A. Pogorelsky
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