RU2360274C1 - Direct voltage stabiliser - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering and may be used in different power supply units for radio equipment. To achieve technical result provided by the invention, the second output (14) of the stabiliser is coupled with emitter of startup transistor (15). The collector of the said emitter is connected to the output pin (2) through the third resistor. The base is coupled with the common output (1) through the second resistor (12). The point of capacitor (14) connection with emitter of startup transistor (15) is linked with diode anode (11) with cathode being coupled with common output (1).

EFFECT: wide functional possibilities while preserving automatic startup of stabiliser during short-term intervals of input voltage outage.

2 dwg

Description

The invention relates to electrical engineering and can be used in various devices for powering radio equipment.

Known DC voltage stabilizers for AS 1337888, G05F 1/56, publ. 09/15/87, Bull. No. 34, a.s. 1509853, G05F 1/569, publ. 09/23/89, Bull. No. 35, having devices for stabilizer starting.

The disadvantage of these devices is the power consumption from the power source due to the current constantly flowing through the starting resistor during the operation of the stabilizer, which reduces the efficiency

Also known are DC stabilizers according to as 1012220 G05F 1/58, publ. 04/15/83, Bull. No. 14, 1684782, G05F 1/56, publ. 10/15/91, Bull. No. 38, in which the inrush current is excluded in the stabilization modes of the output voltage.

A disadvantage of the known devices is the inability to restore performance during short-term power failure and its repeated occurrence. The stabilizer is launched only if, after turning off the supply voltage, it will turn on again after a sufficient time has elapsed for the starting capacitor to discharge.

Closest to the technical nature of the proposed one is a constant voltage stabilizer for AS 1343403, G05F1 / 569, publ. 10.10.87, Bull. No. 37, adopted as a prototype.

The scheme of the prototype device is presented in figure 1, where it is indicated:

1 - general conclusion;

2 - output terminal;

3 - additional conclusion;

4 - regulating transistor;

5 - input main output;

6, 7, - resistors of the output voltage divider;

8, 12, 13 - the first, second and third resistors;

9 - a zener diode;

10 - transistor of a DC amplifier;

11 - diode;

14 - capacitor;

15 - protection transistor.

The prototype stabilizer contains a common 1 and output 2 outputs, input main 5 and additional 3 outputs for connecting two corresponding power sources, as well as a control transistor 4 connected by an emitter to input output 5, a linear divider on resistors 6 and 7, and a nonlinear divider on the resistor 8 and a zener diode 9, connected in parallel between the common terminal 1 and the collector of the regulating transistor 4, which is connected to the collector of the transistor 10, the base of which is connected to the output of the linear divider, and the emitter to the output m divider and the output of the nonlinear diode current limiting circuit 11 having a second resistor 12 via the diode 11 which is connected to a further terminal 3.

In addition, the prototype stabilizer is equipped with a serial RC circuit on the resistor 13 and capacitor 14, the output of which is connected to the input terminal 5. The RC circuit is connected in parallel with the regulating transistor 4. The protection transistor 15 is connected by an emitter, a base and a collector to the input terminal 5, with the connection point of the resistor 13 and the capacitor 14 of the RC circuit and the connection point of the diode 11 and the third resistor 12 of the current-limiting circuit.

The prototype device operates as follows.

When power is supplied through the circuit, the third resistor 12, the diode 11, the stabilizer starts. At the time of starting, the capacitor 14 provides a guaranteed delay for turning on the transistor 15. After starting the stabilizer and charging the capacitor 14, the transistor 15 opens and through it the locking potential from the input terminal 5 is supplied to the anode of the diode 11, locking it, thereby ensuring reliable isolation of the stabilizer output from the uncontrolled starting current in stabilization and self-protection modes from overcurrents.

The disadvantage of the prototype device is the need for the mandatory use of an auxiliary power source, which, as a rule, is associated with additional difficulties and significantly limits the scope of such stabilizers, and in some cases is simply unacceptable.

To eliminate these shortcomings in a DC voltage regulator containing a control transistor, the emitter of which is connected to the input terminal, and the collector to the output terminal, a DC amplifier transistor with the opposite type of conductivity, connected by the collector to the base of the control transistor, and the base to the output of the output voltage divider emitter through the first resistor - with a common output and through a zener diode - with an output terminal to which one output of the third resistor is connected, as well as a transistor for start, diode, second resistor and capacitor, the first output of which is connected to the input terminal, according to the invention, the second output of the capacitor is connected to the emitter of the start transistor, the collector of which is connected through the third resistor to the output terminal, the base through the second resistor to the common terminal, and the point the connection of the capacitor and emitter of the start transistor is connected to the anode of the diode, the cathode of which is connected to a common terminal.

The scheme of the proposed device is presented in figure 2, where it is indicated:

1 - general conclusion;

2 - output terminal;

4 - regulating transistor;

5 - input output;

6, 7 - resistors of the output voltage divider;

8, 12, 13 - the first, second and third resistors;

9 - a zener diode;

10 - transistor of a direct current amplifier (UPT);

11 - diode;

14 - capacitor;

15 - start transistor.

The proposed DC voltage stabilizer contains a regulating transistor 4, connected by an emitter to the input terminal 5, and a collector to the output terminal 2, UPT on the transistor 10, having the opposite type of conductivity, the collector of which is connected to the base of the regulating transistor 4. In this case, the base of the transistor 10 is connected to the output of the output voltage divider on the resistors 6 and 7, and the emitter through the zener diode 9 with the output pin 2 and through the first resistor 8 with the common pin 1. The input pin of the stabilizer 5 is connected to the first pin the capacitor 14, the second terminal of which is connected to the emitter of the triggering transistor 15 and the anode of the diode 11, the cathode of which is connected to the common terminal 1 and one terminal of the second resistor 12, the other terminal of which is connected to the base of the triggering transistor 15, whose collector is connected to the output via the third resistor 13 conclusion 2. In this case, the output voltage divider on the resistors 6 and 7 is connected between output 2 and the common 1 conclusions of the stabilizer.

The proposed stabilizer works as follows.

When voltage is applied to the input of the stabilizer, the capacitor 14 is charged through the emitter-collector junction of the trigger transistor 15 and the third resistor 13. In this case, the trigger transistor 15 opens and a voltage appears at the output of the stabilizer, which leads to the opening of transistors 10 and 4. From this moment it enters action of the stabilizer feedback circuit and at its output a nominal output voltage is maintained. The stabilizer goes into operating mode. After the charge of the capacitor 14, the starting transistor 15 closes, providing isolation of the stabilizer output from the starting current, and subsequently does not affect the operation of the stabilizer.

With short-term intervals of input voltage loss, the capacitor 14 is connected with the diode 11 to the input terminals of the stabilizer and supports the input voltage, and with longer dips in the input voltage it is discharged due to the operation of the stabilizer itself. This contributes to the rapid discharge of the capacitor 14, which significantly reduces or practically reduces to zero the preparation time of the stabilizer for its subsequent inclusion after turning off the power.

Due to the introduction of new connections in the proposed stabilizer, there is no need for an auxiliary power source, and the connection of the connection point of the capacitor 14 and the emitter of the start transistor 15 to the anode of the diode 11, the cathode of which is connected to the common terminal 1, allows the stabilizer to automatically return to operating mode during short-term failure input voltage.

Thus, the proposed stabilizer can be used to power devices that are operated at peripheral facilities without maintenance personnel, where a short-term network failure is possible, which helps to increase the reliability of the powered equipment and expand the scope.

Claims (1)

A DC voltage stabilizer containing a control transistor whose emitter is connected to the input terminal, and the collector to the output terminal, a DC amplifier transistor with the opposite type of conductivity, connected by the collector to the base of the control transistor, the base to the output of the output voltage divider, the emitter through the first resistor - with a common output and through a zener diode - with an output terminal to which one output of the third resistor is connected, as well as a start transistor, a diode, a second resistor and a capacitor p, the first terminal of which is connected to the input terminal, characterized in that the second terminal of the capacitor is connected to the emitter of the start transistor, the collector of which is connected through the third resistor to the output terminal, the base through the second resistor to the common terminal, and the connection point of the capacitor and emitter of the start transistor connected to the anode of the diode, the cathode of which is connected to a common terminal.

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