SU817694A1 - Stabilized dc voltage supply source - Google Patents

Description

, one . .

The invention relates to electrical engineering and can be used for supplying radio equipment with a stabilized DC and AC voltage.

Several voltage stabilizers are known, the disadvantages of which are low efficiency due to losses, on the regulating transistor and optional. The need for large filters to smooth out ripple output voltage Sh.

Closest to the proposed technical entity is a transformerless key DC voltage stabilizer containing a bridge rectifier, the input of which is connected to the input terminals,. and the output to the capacitor of the smoothing filter and the input of the key DC voltage regulator, the output connected to the middle point of the transformer primary winding, the channel leads and ends of which are connected through the collector-emitter junction of the switching transistors to the junction point of the smoothing capacitor and the common bus DC voltage, output rectifier with filter 2

rum connected to the secondary winding of the transformer pj.

A disadvantage of the known device is the presence of additional power losses of the converter, formed by the switching transistors operating in the mode of the oscillator, and transmitting part of the power to the additional source of power for all of the voltage through

0 additional rectifier and filter.

These losses reduce the efficiency of the known stabilizer.

In addition, without additional complication of the scheme, this stabilizer

5 does not allow to obtain a stabilized alternating output voltage NIN, whose frequency coincides with the frequency of the input alternating voltage.

0

The purpose of the invention is to expand the functional capabilities of the power source by obtaining at its output a variable stabilized voltage, the frequency of which is equal to

5 input voltage frequency, and device simplification.

The goal is achieved by the fact that in a known stabilized power source containing

Claims (1)

0 bridge rectifier whose input is connected to the input terminals, and the output to the smoothing capacitor, filter and input of the key DC voltage regulator, the output connected to the midpoint of the transformer primary winding,: the terminals of the channel and the end of which are connected via collectors the emitter of the switching transistors to the point of connection of the capacitor of the smoothing filter and the common bus of the key DC voltage regulator, the output rectifier with a filter connected to the secondary circuit There are two transformers in the transformer, the inputs of which are connected to the input terminals and the outputs to the bases of the corresponding switching transistors. The drawing shows a schematic diagram of a stabilized power supply source. It contains a bridge rectifier 1 connected by an output to the capacitor 2 of the filter and to the input of the key stabilizer 3 of a DC voltage, the output of which is connected to the middle point of the primary winding of the transformer 4, the secondary winding of which is connected to the condenser b filter, and the conclusions of the beginning and end of the primary winding are connected to the collectors of the switching transistors 7, the bases of which are connected to the input terminals through current supply elements 8. The stabilized power supply operates as follows. The rectified pulsating voltage at the output of the bridge rectifier 1 charges the capacitor 2 of the filter, the value of which is chosen so that the voltage on it for half the period of the input voltage remains above the set value of the stabilized voltage at the output of the key stabilizer tension The potential of the alternating input voltage through the current-providing elements 8 alternately opens the switching transistors 7. The parameters of the current-generating elements are chosen so that the full opening of the transistors 7 occurs at a slight overpotential at one or another output of the variable voltage source of the potential of the common point of the stabilizer. Thus, each of the switching transistors has half the input voltage period turned on. The voltage on the primary winding of the transformer 4 is rectangular, and the load-constant level with short dips at the switching time of the transistors 7, which are eliminated by the filter capacitor 6. The duration of the voltage dips at the output of the bridge rectifier in the proposed source can be obtained less than 5% of the value of the input voltage period, which allows reducing the capacitors at the output of the source rectifiers 5-10 times and improving its weight and size characteristics. Independence from the input voltage form of the alternating voltage on the windings of the transformer allows us to obtain a better stabilization factor for alternating current compared to the known technical solutions. Claims of the Invention Stabilized DC power supply comprising a bridge rectifier whose input is connected to the input terminals, and an output to a smoothing filter capacitor and an input of a key DC voltage regulator, an output connected to the midpoint of the transformer primary, terminals the beginning and end of which are connected through the transitions of the collector-emitter of switching transistors to the point of connection of the smoothing filter capacitor and the common bus key stabilization a DC voltage source, an output rectifier with a filter, connected to the secondary winding of a transformer, characterized in that, in order to expand the functionality of the power supply while simplifying the device, two current supply elements, the inputs of which are connected to the input terminals, are introduced into it, and the outputs are to the bases of the corresponding switching transistors. Sources of information taken into account in examination 1, USSR Copyright Certificate No. 449339, cl. G ОЬ F 1/44, 1979. 2, USSR Copyright Certificate No. 467338, class, G 05 F 1/04, May 21, 1973 (prototype),