RU2356083C1 - Constant voltage stabiliser - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is attributed to electric engineering and can be used in various power supply devices for radio equipment. In constant voltage stabiliser containing control transistor (4), whose emitter is connected with input lead (3), and collector is connected with output lead (2), transistor (10) of direct current amplifier with opposite conductivity type connected by collector with base of control transistor (4), by base - with output of output voltage divider, by emitter via stabilitron (9) - with common output (1), and diode (11) and starting RC-circuit formed by series-connected the first resistor (5) and condenser (12), which circuit is connected in parallel with control transistor (4), connection point of condenser (12) and the first resistor (5) of starting RC-circuit is connected with anode of diode (11), the cathode of which is connected with common output.

EFFECT: functionality enhancement while keeping automatic start of stabiliser if input voltage drops out for short intervals.

2 dwg

Description

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

Known DC stabilizers for as 1617419, G05F 1/56, publ. 12/30/1990, Bull. No. 48, a.s. 1684782, G05F 1/569, publ. 10/15/91, Bull. No. 38, ensuring the launch of the stabilizer.

The disadvantage of these devices is the inability to restore their performance during short-term power failure and its repeated occurrence, because The starting capacitor discharges through high-resistance resistors. The start of the stabilizer occurs only if, after turning off the supply voltage, it will turn on again after a time sufficient to discharge the starting capacitor.

Also known are DC stabilizers according to as 1001053, G05F 1/58, publ. 02.28.83, Bull. No. 8, in which the discharge of the starting capacitor is carried out using additional elements, which provides quick restoration of the starting capacitor, but leads to the complexity of the device, and the mandatory presence of an additional power source limits the scope of such stabilizers.

The closest in technical essence to the proposed one is a DC voltage stabilizer according to AS 13434403, 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 - input main output;

4 - regulating transistor;

6, 7 - resistors of the output voltage divider;

5, 8, 14 - the first, second and third resistors;

9 - a zener diode;

10 - transistor;

11 - diode;

12 - capacitor;

13 - input additional output;

15 - protection transistor.

The prototype stabilizer contains a common 1 and output 2 outputs, input main 3 and additional 13 outputs for connecting two corresponding power sources, as well as a regulating transistor 4 connected by an emitter to input output 3, a linear divider on resistors 6 and 7, and a nonlinear divider on the second a 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 is with the output of the nonlinear divider and the output of the diode 11 of the current-limiting circuit, which also has a third resistor 14, through which the diode 11 is connected to the additional output 13.

In addition, the prototype stabilizer is equipped with a serial RC circuit on the first resistor 5 and capacitor 12, the output of which is connected to the input terminal 3. The RC circuit is connected in parallel with the regulating transistor 4. The protection transistor 15 is connected by an emitter, base, and collector to the input terminal 3 , with the connection point of the first resistor 5 and the capacitor 12 of the RC circuit, and the connection point of the diode 11 and the third resistor 14 of the current-limiting circuit.

The prototype device operates as follows.

When power is supplied through the circuit, the third resistor 14 of the diode 11, the stabilizer starts. At the time of starting, the capacitor 12 provides a guaranteed delay for turning on the transistor 15. After starting the stabilizer and charging the capacitor 12, the transistor 15 opens and through it the locking potential from the input terminal 3 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 disadvantages of the prototype device are the complexity of the circuit design of the launch device and the mandatory use of an additional power source, which significantly limits the scope of such stabilizers.

To eliminate these shortcomings, 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, a collector connected to the base of the control transistor, the base to the output of the output voltage divider emitter through a zener diode - with an output terminal and through a second resistor - with a common terminal, as well as a diode and an RC starting circuit from a series of first-connected res a stator and a capacitor connected in parallel with the control transistor according to the invention, the connection point of the capacitor and the first resistor of the starting RC circuit 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;

3 - input output;

4 - regulating transistor;

5, 8 - the first and second resistors;

6, 7 - resistors of the output voltage divider;

9 - a zener diode;

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

11 - diode;

12 is a capacitor.

The proposed DC voltage stabilizer contains a control transistor 4 connected by an emitter to input terminal 3, and a collector to output terminal 2, UPT on transistor 10, having the opposite type of conductivity, the collector of which is connected to the base of the control transistor 4. In this case, the base of 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 second resistor 8 with the common pin 1. The starting RC circuit consists of series-connected condensers 12 and the first resistor 5, and connected in parallel to the regulatory transistor 4. Moreover, the capacitor 12 and the junction point of the first resistor RC-circuit 5 is connected to the anode of the diode 11, the cathode of which is connected to the common terminal 1.

The proposed stabilizer works as follows.

When voltage is applied to the input of the stabilizer, the current passing through the capacitor 12 and the first resistor 5 creates a trigger voltage at the base of transistor 10, which leads to the opening of transistors 4 and 10. From this moment, the stabilizer feedback circuit comes into operation, maintaining the rated voltage at the output . The stabilizer goes into operating mode.

With a short-term loss of the input voltage, the capacitor 12, using the diode 11, is connected to the input terminals of the stabilizer and maintains the input voltage, and with longer dips in the input voltage, it is discharged due to the operation of the stabilizer itself.

This provides a quick discharge of the capacitor 12, and it is ready for restarting when the input voltage appears, which creates the conditions for the automatic start of the stabilizer in the operating mode for short-term intervals of the input voltage fading.

Thus, the proposed stabilizer in comparison with the prototype has wider capabilities, since there is no need for an additional power source, and the starting circuit is simplified, and the connection point of the capacitor 12 and the first resistor 5 of the starting RC circuit to the anode of the diode 11, the cathode of which connected to the common output 1, allows for automatic return of the stabilizer to the operating mode for short-term intervals of the loss of input voltage.

This allows you to use the proposed stabilizer for powering devices that are operated at peripheral facilities without maintenance personnel, where short-term network failure is possible, which expands the scope of the device.

Claims (1)

A DC voltage stabilizer containing a control transistor, the emitter of which is connected to the output terminal, and the collector to the output terminal, a DC amplifier transistor with the opposite type of conductivity, a collector connected to the base of the control transistor, the base to the output of the output voltage divider, the emitter through the zener diode - with an output terminal and through a second resistor - with a common terminal, as well as a diode and an RC starting circuit from a series of connected first resistor and capacitor, connected in parallel a regulating transistor, characterized in that the connection point of the capacitor and the first resistor of the starting RC circuit is connected to the anode of the diode, the cathode of which is connected to a common terminal.

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