RU2367000C1 - Constant voltage stabiliser - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used as radio hardware secondary power source. Stabiliser comprises control transistor (1) with emitter connected to stabiliser input terminal and collector connected to output terminal. It comprises also DC amplifier transistor (2) with opposite type of conductance, collector-connected to the base of control transistor (1) and base-connected to the output of output voltage divider built around resistors (4 and 5). Its emitter is connected, via stabiliser diode (3), with output terminal and, 2^nd resistor, with common terminal. Proposed stabiliser comprises also starting RC-circuit consisting of capacitor(7) and 1^st resistor (6), and 1^st diode (8). In compliance with this invention, additionally, stabiliser incorporates 2^nd diode (10) with its cathode connected to the points of connected between 1^st resistor (6) and 1^st diode (8). The latter has its cathode connected to output terminal, while anode of 2^nd diode (10) is connected to common output terminal. Note here that the output terminal of capacitor (7) is connected to stabiliser input terminal.

EFFECT: starting stabiliser at intermittent fault of input voltage, simplified starting circuit.

2 dwg

Description

The invention relates to electrical engineering and can be used in secondary power sources of radio equipment.

Known DC stabilizers for as 1012220, G05F 1/58, publ. 04/15/1983, BI No. 14, a.s. 1617419, G05F 1/56, publ. 12/30/1990, BI No. 48, having devices that ensure the launch of the stabilizer.

The disadvantage of these stabilizers is the inability to restore their performance during short-term power failure. 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, BI No. 8 and 1343403, G05F 1/569, publ. 10.10.87, BI No. 37, the disadvantages of which are the mandatory availability of an additional power source, which significantly limits the use of such stabilizers.

Closest to the technical nature of the proposed one is a constant voltage stabilizer for AS 1684782, G05F 1/569, publ. 10/15/91, BI No. 38, adopted as a prototype.

The stabilizer prototype is shown in figure 1, where it is indicated:

1 - regulating transistor;

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

3 - zener diode;

4, 5 - resistors of the output voltage divider;

6, 9, 12, 13 - the first, second, third and fourth resistors;

7 - capacitor;

8 - diode;

11 - starting transistor.

The prototype stabilizer contains a control transistor 1 included in the power bus according to the scheme with a common emitter, a CTF on the transistor 2, a collector connected to the base of the control transistor 1, and an emitter through a second resistor 9 connected to a common bus, a zener diode 3 connected between the output power output and the emitter of the transistor UPT 2, the divider of the output voltage across the resistors 4 and 5, the output connected to the base of the transistor UPT 2. The starting transistor 11, the collector of which is connected to a common bus, the base through sequentially connected e capacitor 7 and the first resistor 6 is connected to a common bus, and the emitter junction circuit is connected between the base of the control transistor 1 and the capacitor 7, and the base of the starting transistor 11 through the fourth fourth and third 12 resistors connected in series is connected to the base of the control transistor 1 and through the diode 8 - with the emitter of the starting transistor 11. In this case, the diode 8 is shunted by the third resistor 12.

The prototype stabilizer works as follows.

When the input voltage is connected, the base current of the regulating transistor 1 is created by the starting transistor 11, which is open by the charge current of the capacitor 7. The time constant of the circuit from the series-connected capacitor 7 and the first resistor 6 is selected from the condition of a reliable start of the stabilizer.

Stabilization of the output voltage is carried out using the UPT on the transistor 2, acting on the control transistor 1. As a result, the output voltage returns to its original level. In this case, the emitter junction of the starting transistor 11 is locked, that is, the capacitor 7 does not discharge and does not reduce the efficiency of the UPT on the regulating transistor 1. Since the capacitor 7 does not discharge, it does not charge when the input voltage increases again, i.e., the charge current does not occur opening control transistor 1.

To prevent breakdown of the emitter junction of the starting transistor 11, a diode 8 is connected in series with it. The discharge of the capacitor 7 occurs through high-resistance resistors 12 and 13.

The stabilizer starts only if, after the input voltage is turned off, it is switched on again after the time interval necessary for the discharge of the starting capacitor has expired. This eliminates the possibility of using this stabilizer at peripheral facilities without maintenance personnel.

The disadvantage of the stabilizer prototype is the inability to restore its performance during short-term loss of input voltage, as well as the complexity of the circuit design of the launcher.

To eliminate these shortcomings, a DC voltage stabilizer containing a control transistor, the emitter of which is connected to the input output of the stabilizer, 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 divider voltage, emitter through a zener diode - with an output terminal and through a second resistor - with a common terminal, as well as a starting serial RC circuit and the first diode, according to As well as the invention, a second diode is introduced, the cathode of which is connected to the connection point of the first resistor and the first diode, the cathode of which is connected to the output terminal, and the anode of the second diode is connected to the common terminal, while the capacitor terminal is connected to the stabilizer input terminal.

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

1 - regulating transistor;

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

3 - zener diode;

4, 5 - resistors of the output voltage divider;

6, 9 - the first and second resistors;

7 - capacitor;

8, 10 - the first and second diodes.

The proposed stabilizer contains a regulating transistor 1, connected by an emitter to the input terminal, and a collector to the output terminal of the stabilizer, on the transistor 2 of the opposite type of conductivity, the collector of which is connected to the base of the regulating transistor 1, and the base of the transistor 2 is connected to the output of the output voltage divider on the resistors 4 and 5, the emitter through the zener diode 3 is connected to the output terminal and through the second resistor 9 to the common terminal. In addition, a circuit consisting of two series-connected diodes 8 and 10, connected between the output terminals, a starting RC series circuit from the capacitor 7 and the first resistor 6, with one output connected to the connection point of the first 8 and second 10 diodes, and the other to stabilizer input.

The proposed stabilizer works as follows.

When an input voltage is applied to the input of the stabilizer, the capacitor 7 is charged through the first resistor 6 and the first diode 8, and a voltage appears at the output of the stabilizer, after which the control transistor 1 and the transistor UPT 2 open. From this moment, the stabilizer feedback circuit comes into operation, maintaining the rated voltage at the output. The first diode 8 attenuates the variable component of the input voltage, and the second diode 10 accelerates the discharge process of the capacitor 7.

At short intervals of loss of input voltage, the capacitor 7 through the second diode 10 is connected to the input terminals and supports the input voltage, and for longer voltage dips, it is discharged due to the operation of the stabilizer itself. This provides a fast discharge of the capacitor 7.

Thus, the start of the stabilizer occurs regardless of the length of the time interval during which there is no input voltage, i.e. its automatic start-up is ensured in case of sudden loss of input voltage and its repeated occurrence, which makes it possible to use the proposed stabilizer for powering devices that are operated at peripheral objects without maintenance personnel, i.e. The scope of the proposed stabilizer is expanding.

Claims (1)

A DC voltage stabilizer containing a control transistor, the emitter of which is connected to the stabilizer 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, the emitter through the zener diode - with an output terminal and through a second resistor - with a common terminal, as well as a starting serial RC circuit and a first diode, characterized in that a second diode is inserted, as od which is connected to the connection point of the first resistor and the first diode, the cathode of which is connected to the output terminal and the anode of the second diode - with a common terminal, wherein the output capacitor is connected to the input terminal of the stabilizer.

Images