SU1244648A2 - D.c.stabilizer - Google Patents

Abstract

The invention relates to DC stabilizers and is in addition to the invention pa auth. St. No. 521556. The aim of the invention is to increase the stability of the output current. The goal is achieved by introducing a permanent 11 and a variable 12 resistors, as well as a field 9 and a bipolar 10 transistors, into the circuit. When the input voltage changes, the sum of the currents of the transistors 9 and decreases. 10. However, stabilization elements, including Zener diode 2, reference resistor 3, transistor 1 and damping element 4, prevent this decrease. The sum of the currents of the transistors 9 and 10 is equal to the current to be stabilized. 1 il. 0t-0 (L MS)

Description

The invention relates to electrical engineering and can be used as a power source for electrical and radio equipment.

The purpose of the invention is to increase the stability of the inrush current.

The drawing shows a circuit diagram of a DC stabilizer.

The stabilizer contains a regulating transistor 1, a zener diode 2, a reference resistor 3, an extinguishing element 4, made on transistor 5 and resistors 6 and 7, a load 8, field-effect and bipolar transistors 9.10, a variable resistor 12 and potentiometer 13, the source of the field-effect transistor 9 through the variable resistor 12, and the emitter of the bipolar transistor 10 is directly connected to the input terminal of negative polarity, the collector of the bipolar transistor 10 is directly connected to the junction point of the anode with abilitron 2 and one of the terminals of the reference resistor 3, and through resistor 11 to the connection point of the base and drain of the transistors 10.9. Respectively, the gate of the trasistor 9 is connected to the moving contact of the potentiometer 13 connected between the input terminals, the collector of the transistor 5 is connected to the cathode the Zener diode 2 and the base of the transistor 1, the emitter of which is connected to the second pin of the reference resistor 3, the base of the transistor 5 is connected to the collector of the transistor 1 and the resistor 7, the second terminal of which is directly connected to one of the input terminals through a resistor 6 to the emitter of the transistor 5, second output terminal connected to the input terminal of positive polarity

The DC stabilizer works as follows.

Part voltage U., with movable X

The contact of the potentiometer 13 enters the gate of the transistor 9 and opens it. The transistor 10 also opens the position of its operating point determined by the value of resistor 11, voltage and current through transistor 9. The value of the current to be stabilized is determined by the zener diode 2 and the reference resistor 3, the sum of the currents of the transistors 9 and 10 is equal to the current to be stabilized, and the base current of the transistor 10 and the current of transistor 9 is commensurate.

When you change the voltage U prooH

comes next.

For example, an increase in the input voltage Ugj leads to an increase in the current of the transistor 9 and to a decrease in the base and collector current of the transistor 10, and hence to a decrease in the sum of the currents of the transistors 9. and 10. However, the stabilization elements, including Zener diode 2, the reference resistor 3, the transistor 1 and the damping element 4, prevent the sum of the currents from decreasing, which leads to an increase in the voltage U. An increase in voltage and in turn leads to an increase in the base voltage and, therefore,

and the collector current of the transistor 10. As a result, the voltage U increases by takzto the value at which the currents of transistors 9 and 10 remain equal to the current determined by the stabilization elements.

When shading occurs obrat.

By selecting the value of the resistor 11 and the position of the moving contacts of the potentiometer 13 and the variable resistor 12, it is possible to achieve that a change in the voltage Ugj) leads to the same change in the voltage U, i.e.

 Ui The dc stabilizer is adjusted as follows.

The minimum possible voltage is set at the input () by adjusting the resistor 13. The transistor 9 is set at the closing threshold and the voltage at the transistor 10 (U.) Is measured. Then, the maximum possible voltage at the input (Ug ,, c, c; c) is established, the resistor 12 is set on the transistor 10 to have a voltage C, equal to C u, (, (Ug, d, ax-V / «« H)

thirty

Claims (1)

Invention Formula DC stabilizer auth. St. No. 521556, about tl and h a - y y and so that, in order to increase the stability of the output current, constant and variable resistors, field and bipolar transistors and a potentiometer are introduced into it, 3 12446484 In this case, the source of the FET transistor of the Zener diode and the reference resistor of the variable resistor, and the emitter resistor, and through the constant resistor of the bipolar transistor directly to the base junction point are bi-directionally connected to the input terminal source of the FET, the negative field the collector5 whose gate is connected to a movable bipolar transistor is connected to a non-contact contact of the potentiometer, including to the connection point between the input terminals.