SU657420A1 - Stabilized dc voltage source - Google Patents

Description

the cut resistor is connected to the nepeKniOjaromHX bases of the transistors, and the other extreme lead through the voltage source to the output power terminal of the regulating transistor of the linear regulator of the direct voltage, while the secondary winding of the transformer of the converter is connected to the control stabilizer of the regulator of the transformer by means of the stabilizer of the stabilizer of the transformer after one stabilizer of the transformer and another output through the diode to the input power terminal of the same control transistor and through the second resistor to the common bus.

The drawing is a schematic electrical diagram of the source described,

The stabilized DC voltage source contains a linear DC voltage regulator consisting of a regulating transistor 1 and a control node 2, and a switching voltage regulator consisting of a regulating transistor 3, D1, C filter on a diode 4, the choke 5 and the capacitor b and the control unit, made in the form of a magnetic transistor converter on the transformer 7 and switching transistors 8 and 9, and the source of the reference voltage on the Zener diode Yu and the capacitor 11. The secondary winding of the inverter 7 one output connected to the base of the transistor 3, and the other through the diode 12 to one output and through a resistor 13 to another input output. The collectors of transistors 8 and 9 are connected in parallel to the input terminals. The primary winding of the transformer 7 is divided in half into two windings 14 and 15, with a series of winding 14 and resistor 16 connected in series between the emitters and the bases of the switching transistors 8 and 9, and the winding 15 at one end connected to the emitters of transistors 8 and 9, and the other through the source the reference voltage to the collector of transistor 1,

The stabilized constant voltage source operates as follows.

The voltage at the output of the pulse stabilizer is determined by the expression

WITH

BCL

1VT

WITH

ON ВЬ | КЛ

 ON "Vjl duration

the on and off intervals of the transistor 3j,

E is the supply voltage of a stabilized source.

The turn-on time of the on state is determined by the time of magnetization reversal of the transformer core 7 under the action of the difference of the supply voltage f, the reference voltage and the zener diode 10 and the voltage Shchna to the load. This time is determined by the formula

gBgWQ

C2)

Herein, the saturation core of the transformer 7

W is the number of turns of the winding 15 of the transformer 7;

Q is the cross-sectional area of the core of the transformer 7,

Over time, the action of the voltage on the winding 14 of transistor 8 is open, along the circuit: + B - transistor 8 - winding 15 - Zener diode 10 and capacitor 11 - load current flows, providing power to Zener 10 and charging capacitor 11 to voltage level UQ, ,

When the transformer 7 core is clamped, transistor 8 is locked and transistor 9 is unlocked, causing the transformer core to re-magnetize in another direction under the effect of sum of output voltage UH and voltage U pn of capacitor 11 applied to winding 15 its locked state equals

B)

off

on and

From expressions (1) - (3) receive

C4)

Ur-Uon + JH

The voltage across the control transistor 1 of the linear voltage regulator is equal to

it C-1-and „. (5) -Of expressions (4) and (5) have

T-tJon (6)

From expression (6) it can be seen that the voltage across the transistor 1 in this source does not depend on the UK output voltage and the voltage, 2 power. The same problem is solved in the well-known sources with two regulating elements by more complex means, by forming in the pulse stabilizer a closed control loop on the voltage deviation U --. - OT of a predetermined value. As can be seen from expression (4), in the proposed source, the voltage U at the input of the linear voltage regulator does not depend on the magnitude of the supply voltage. This creates an additional stabilization of the output voltage U with respect to perturbations from the voltage side E of the power supply. In known stabilizing sources with two regulating elements, this property is absent. Thus, the proposed source has all the advantages of sources with two regulatory elements and at the same time is extremely simple and reliable. It can be widely used as unregulated and regulated sources of stabilized voltage of various electronic devices. Its application is especially effective in cases when it is required to simultaneously provide good quality stabilization, high efficiency, small dimensions and weight, a wide range of re-regulation, high reliability and low cost. Formula of the Invention A stabilized source of constant voltage containing a 1HU1 connected cable and a constant voltage stabilizer, and a switching voltage regulator consisting of a control transistor connected to one of the power buses the clamp of which is connected to one of the input terminals, the output power terminal with the input of the DSS filter, the control terminal with the output of the control unit including the source of the reference voltage, and the linear stabilizer The remaining voltage consists of a control transistor, the input power terminal of which is connected to the output of the DCC. filter, the output power terminal to one of the output terminals, and the control terminal to the output of the control node connected to the output terminals, So that, in order to simplify the circuit, the control unit of the DC voltage regulator is implemented in the form of an asymmetrical magnet-transistor converter on two switching transistors and a transformer, the primary winding is The middle point is connected to the emitters of the switching transistors, the collectors connected to the outputs, one of the terminal leads through the first resistor to the switching bases of the transistor, and the other extreme output through the voltage source to the output stabilizer of the regulating transistor of the linear stabilizer of the direct voltage at the same time, the secondary winding of the transformer of the converter is connected by one output to the control terminal of the regulating transistor of the switching regulator a DC voltage, and the other terminal through the diode - to the input terminal of the power transistor and regulating the same by vtoroyrezistor - a common bus. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 360655, class, 6 05 F 3 / О8, 1973. 2, USSR Author's Certificate No. 308424, class, G 05 F 1/56, 1973,