RU1774319C - Stabilized power supply - Google Patents

Abstract

Usage: on power supply systems for radio devices with a wide output voltage range. SUMMARY OF THE INVENTION: the device comprises a series voltage stabilizer and a make-up circuit connected between the input and output of this stabilizer. A linear type voltage regulator is introduced into the make-up circuit. Moreover, when the load changes over a wide range, the device performs the functions of its stabilization. 1 ill.

Description

The invention relates to electrical engineering and can be used in radio power supply systems.

Linear stabilizers (LS) are known, which comprise an adjustable powerful transistor and its control stages 1.

The disadvantage of such LCs is that with significant changes in the input voltage and high currents of the load, the power dissipated by the transistor becomes so large that a cooling radiator of large mass and area is required, and this complicates the device.

A stabilized DC power source is known, comprising a power rectifier, the input of which is connected to the input terminals of the device for connecting a primary AC power source, a series voltage regulator connected in series through auxiliary diodes, a limiting inductor and a low-pass filter 2.

The disadvantage of this device is the narrow load characteristic (not more than 30% of the change in load from the nominal value),

The aim of the invention is to expand the range of output loads of the device.

The goal is achieved by the fact that a stabilized power supply containing a power rectifier, the input of which is connected to input terminals designed to connect a primary AC power source, a series voltage regulator, the input of which is connected to the output of the power rectifier, and the output to output terminals and an output voltage make-up circuit including a current limiting choke and two rectifier diodes connected in a bridge circuit, wherein the make-up circuit is connected between the input Displayed

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To connect the primary AC power source, and output terminals, diodes to the input terminals, a linear type voltage regulator is inserted into the make-up circuit, connected between the current limiting inductor and the output terminals and consisting of a series control transistor, the collector of which is connected to the input, and emitter - with the output of a voltage stabilizer, a support element connected between the base of the regulating element and the common bus, and a resistor connected between the collector and the base of the regulator a voltage regulating voltage U0n of the stabilizer and the rated voltage VHOM at the output of the series stabilizer. by the following relation: (V0n + Ube) VHOM.

The drawing shows a diagram of a stabilized power source.

It contains a make-up circuit consisting of auxiliary diodes 11 and 12, a current-limiting interconnector 10, a linear regulator, a power rectifier 4 with a filter, a series voltage regulator 5, an output filter 6. The input terminals are indicated by 2 and 3 in the diagram devices designed for. connecting the primary power source 1 of variable type, and at 13 m 14 the output terminals of the device are designed to connect the load 15.

The input of the power rectifier is connected to the input terminals 2 and 3 of the device. The input of the series voltage stabilizer 5 is connected to the output of the power rectifier 4, and the output is connected to the output terminals 13 and 14 of the device. The extreme conclusions of the current-limiting throttle 10 through auxiliary diodes 11 and 12 are connected to the input terminals 2 of the IS. The midpoint of the throttle 10 is connected through a linear stabilizer, consisting of a transistor 7, a reference voltage source 8 and a base resistor 9, to the output terminals 13 and 14 of the device

The device operates as follows.

At rated load, the input voltage is equal to the reference voltage and the voltage of the basic transition of the linear

voltage stabilizer 5 In this case, the base transition of the transistor 7 is open through the resistor 9 due to the fact that the voltage of the reference voltage source 8 is higher,

than the rated voltage of the stabilizer 5.

As soon as the output load of the device is reduced so that the output voltage rises due to energy,

0 accumulated in the inductor 10, to the value of the sum of the reference voltage and the voltage of the base transition of the transistor 7, it switches to the linear stabilizer mode, and the stabilizer 5 is locked. With a further 5 decrease in load, the output voltage does not change.

Claims (1)

SUMMARY OF THE INVENTION A stabilized power supply comprising a power rectifier, the input of which is connected to input terminals for connecting a primary AC power source, a series voltage regulator, the input of which is connected to the output of the power rectifier, and the output to output terminals, and an output voltage make-up circuit including a current limiting choke, two rectifier diodes connected along a bridge 0 to the circuit, wherein the make-up circuit is connected between the input terminals for connecting the primary AC power source, and the output terminals, diodes to the input terminals, 5 characterized in that in order to expand the range of the output load, a linear type voltage regulator is inserted in the feed circuit, connected between the current limiting inductor and 0 output pins and consisting of a serial control transistor, the collector of which is connected to the input, and the emitter to the output of the voltage stabilizer, the reference element included 5 between the base of the regulating element and the common bus, and a resistor connected between the collector and the base of the regulating element, and the reference voltage Von of the stabilizer is connected to the voltage at the base-emitter junction of the regulating transistor Ves of this stabilizer and the rated voltage VHOM at the output series stabilizer as follows 5 (Von + V63) VHOM w