SU1601612A1 - D.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to sources of secondary power supply for electronic equipment. The goal is to increase the reliability and efficiency of autoregulation. The device contains a transformer 1 with magnetic cores 2-5, a common primary winding 6, control windings 7, 8, windings 9, 10 remagnetization and output winding 11, current sensor 12, transistor 13, current limiting resistor and filtering unit 15 a source of 16 DC voltage. As the voltage on the load increases, the current in the windings 6-8 decreases, the voltage on the current sensor 12 becomes less than the voltage on the load. The transistor 13 opens by increasing the current in the windings 9, 10 and restoring the preset mode on the output voltage. Introduction to the input circuit of the transistor amplifier of the output circuit of the unit 15 allows only one P-N-P current transistor to be used in the amplifier. 1 hp f-ly, 2 ill.

Description

The invention relates to electrical engineering and is intended for use in the implementation of secondary power supply of electronic equipment.

The purpose of the invention is to understand the reliability and efficiency of autoregulation.

Figo shows a functional DC voltage regulator circuit; FIG. 2 shows current-voltage characteristics explaining the advantages of the selected current sensor.

The stabilizer contains a control transformer 1 with the first 2, second 3, third 4 and fourth 5 magnet conductors, the common primary winding 6, the control windings 7 and 8, the bias windings 9 and 10 and the output winding And, the current sensor 12, For example, in the form of series-connected resistors and a zener diode, a transistor 13, a current-limiting resistor 14, a rectifier and filtering unit 15, and an adjustable DC source 16. These elements 9, 10, 13, and 14 comprise an aggregate transistor amplifier.

The diagram also shows the outputs 17 and 18 dp of connecting the primary source of alternating current voltage and the terminals 19 and 20 for connecting the load. The common primary winding 6 is connected to the terminals 17 and 18o. The windings 7 and 8 of the control are connected in series and applied to the magnetic conductors 2 and Zo. The windings 9 and 10 magnetizations are switched on oppositely and applied together with the output winding 11 to the magnetic cores 4 and 5c. The input of the rectifier and filtration unit 15 is connected to the output winding 11, and the output is connected to terminals 19 and 20 of the control unit. entrance regulation The constant voltage source 16 is connected to the output of the rectifier and filtering unit 15, and the output through the current sensor 12 is connected to the windings 7 and B of the control. The input circuit of the transistor amplifier (emitter circuit of the basic transistor 13) is connected to the output of the sensor 12 current, and the output circuit through the windings 9 and 10 of the bias and the current-limiting resistor 14 - with pins 19 and 20 The output circuit of the rectifier unit 15 is inserted into the input circuit of the transistor amplifier

5 0 5

0

five

for filtering and filtering with the polarity of the voltage opposite to the polarity of the voltage on the current sensor 12, the latter being included in the circuit in the direction blocking for the transistor amplifier

The voltage regulator operates as follows.

When the input voltage is applied to the common primary winding 6 of the transformer 1, magnetic flux occurs in the magnetic cores 2-5, causing an emf on the output winding 11, which is then rectified and smoothed in the rectifier and filtering unit 15 and from its output (positive and minus busbar is fed to pins 19 and 20 (to the load). Regulated voltage source 16 is dependent on deviation of the variable voltage and changes the current 1y in the windings U and 8 controls, as a result of which it changes; The magnitude of the voltage U, 2 on the current sensor 12, controlling the transistor 13o. This changes the biasing current in the bias windings 9 and 10, which additionally regulates the output voltage. For example, when the output voltage increases and C (or the current decreases) load IP), the current lu in the windings 7 and 8 of the control decreases even at some value of 1 I mich (Fig2) voltage and, 2. on the current sensor 12 becomes less than the voltage Uf, o The voltage Ug.jHa of the base-emitter junction of the transistor 13 is negative, and the transistor 13 starts to open, increasing the current in the windings 9 and 10 of the bias, which further reduces the output voltage and to the original value

g.

The chosen implementation of the input circuit of the transistor amplifier predetermines a significant simplification of the design of the latter, making it possible to use only one pn-type transistor. This has a positive effect on the operational reliability of the stabilizer as a whole. The increased efficiency of the auto-regulation is achieved due to the disconnection of the bias windings 9 and 10 at the rated current Ij, when the current lu of the control windings 7 and 8 creates a voltage U ,, 2 on the sensor 12. higher than the output voltage and

"

5. 16016

and thereby locks the transistor 13o

A perceptible reduction in the loss of power is achieved when the sensor 12 is connected in the form of a series-connected resistor and a zener diode. In FIG. 2, the right 21 displays the current-voltage characteristic of the purely resistive current sensor 12, and the right 22 shows the same characteristic when the zener diode is inserted into it.

It is advisable to use the stabilizer in cases where the output voltage U is less than the voltage of the controlled source 16o

Claims (1)

Invention Formula 1P DC voltage stabilizer containing an adjustable-voltage transformer with four magnetic conductors, a common primary winding connected to the terminals for connecting the primary AC voltage source, two control-connected windings applied on the first and second magnetic conductors , and two winding-induced bias, applied together with the output winding, applied together with the output winding to the third and fourth magnetic circuits, filtering and supplying, the input of which is connected to the output winding of the transformer, and the output with leads for connecting the load, an adjustable DC voltage source, the control input of which is connected to the output of the rectifier and filtering unit, and the output through the current sensor to transformer control windings, a transistor amplifier whose input circuit is connected to the output of the current sensor, and the output circuit is cut through the bias winding and current-limiting resistor - with the terminals dp connecting the load, different In order to ensure the reliability and efficiency of the auto-regulation, the output circuit of the rectifier and filtering with the polarity of the voltage on the current sensor was inserted into the input circuit of the transistor amplifier, the latter being included in the circuit with a locking for transistor amplifier direction one . 2o Voltage stabilizer according to claim 1, characterized in that, in order to reduce power consumption, the current sensor is made in the form of a series-connected resistor and zener diode and, Pmik Wy)