SU1695465A1 - Stabilized dc/dc converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in the sources of secondary power supply of electronic equipment. The aim of the invention is to improve the quality of the output voltage by increasing its accuracy. The device contains a pulse part 2, the output of which is connected to the primary winding 3 of the power transformer 4, the secondary winding 5 of which is connected via filters 6 to the output pins 7, the isolating transformer 8, the primary winding 14 of which is connected in series with the secondary winding 12 of the drossel 13 of the filter 6. This series circuit is connected in parallel to the secondary winding 5 of the power transformer 4. The stability of the output voltage is achieved by taking into account and inductance dissipation winding 5.1 Il, 1 h. apt.

Description

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

A stabilized voltage converter is known, comprising a pulse voltage converter connected between the input and output terminals, a galvanic isolation unit and a clock generator, a constant voltage converter into an amplitude of pulses and an amplitude discriminator with a memory, and a potential input of a constant voltage converter the amplitude is connected to the output pins, the clock input is connected to the output of the clock generator, and the output is connected to the input of the galvanic isolation node, the output of which is through The volumetric discriminator is connected to the control input of a pulse voltage converter.

The disadvantage of this device is its complexity.

Closest to the present invention is a device containing a pulse part connected to the input pins, the output of which is connected to the primary winding of a power transformer, the secondary winding of which is connected via a DLC filter to the output pins of the device to which the primary winding of the isolation transformer is connected via an auxiliary switch, The control input of which is connected via a limiting resistor to the secondary winding of the power transformer, and the secondary winding of the isolating transformer is The auxiliary circuit (amplitude detector) is connected to the control inputs of the pulse part.

The disadvantage of the device is its complexity.

The aim of the invention is to improve the quality of the output voltage by increasing its accuracy.

The goal is achieved by the fact that a device containing a pulse part connected to the input pins, the output of which is connected to the primary winding of a power transformer, the secondary windings of which through a DLC filter are connected to the output pins of the device, the switching transformer whose secondary winding through the auxiliary circuit ( the amplitude detector) is connected to the control inputs of the pulse part, the secondary winding of the throttles of the DLC filter is inserted, connected in series with the primary winding of the connecting transformer, the latter connected to the secondary winding of the power transformer.

In addition, in order to improve temperature stability, consistently with

The secondary winding of the DLC filters includes two anti-parallel diodes that have thermal contact with the diodes of the DLC filter.

The drawing shows a block diagram

0 stabilized constant voltage converter.

The stabilized DC / DC converter contains 1 pulsed, connected to the input terminals.

5 part 2, the output of which is connected to the primary winding 3 of the power transformer 4, the secondary windings 5 of which through the DLC filter 6 are connected to the output terminals of the device 7, the isolation transformer 8, the secondary winding 9 of which through the auxiliary circuit 10 is connected to the control inputs of the pulse Part 2. The secondary winding 12 droplets 13 DLC-filter 6 is connected in series with

5 by the primary winding 14 of the isolation transformer 8, and they are connected to the secondary winding 5 of the power transformer 4. In addition, the device may contain counter-parallel diodes 15,

0 connected in series with the secondary winding 12 droplets 13 DLC-filter 6.

The device works as follows.

. In the pulse formation interval

5, the polarity of the voltages on the windings of the magnetic elements corresponds to that indicated in the drawing. In this case, the primary winding 14 of the isolation transformer 8 is subjected to a voltage proportional to the voltage on the output terminals 7 (equal to it with a unit transformation ratio of Drosles 13 of the DLC filter 6). The voltage from the secondary winding 9 of the isolating transformer 8 through the auxiliary circuit 10. As shown in the drawing, the amplitude detector is connected to the control inputs 11 of the pulse part 2. Thus, at the step of forming the pulse, the voltage is applied to the input of the pulse part 2 equal to or proportional to the voltage at the output terminals of the converter. At the stage following the stage of pulse formation, taking into account the serial connection of the winding 5 of the power transformer 4, the winding 12 throttle 13 of the DLC filter 6 and the winding 14 of the transformer 8, as well as taking into account the equality of the volt power squares for the windings of the power transformer

transformer 4 and throttles 13 for isolation transformer 8 also fulfills the aforementioned equality. The inclusion of diodes 15, while ensuring thermal contact with the diodes of the DLC filter 6, ensures the temperature stability of the transmission of the feedback signal (eliminating the effect of the thermal drift of the diodes of the DLC filter 6).

As a pulse part 2, any voltage converter (its switching part) with its control circuit (SU) can be used. The specific implementation of block 10 depends on the characteristics of SU.

Thus, the proposed device improves the accuracy of output voltage stabilization, since the leakage inductance 5.1 in the feedback circuit is taken into account,

The use of two parallel parallel diodes in a series circuit that has thermal contact with the diodes of the DLC filter allows thermal compensation of the device, which increases the temperature stability of the output voltage.

Claims (2)

1. A stabilized DC / DC converter containing a pulsed part connected to the input pins, the output of which is connected to the primary winding of a power transformer, the secondary windings of which through a DLC filter are connected to the output pins of the device, an uncoupling transformer whose secondary winding through an auxiliary The circuit is connected to the control inputs of the pulse part, characterized in that, in order to improve the quality of the output voltage by increasing its accuracy, a secondary winding is introduced A cross section of the DLC filter, connected in series with the primary winding of the isolation transformer, forms a series circuit that is connected in parallel with the secondary winding of the power transformer. 2. The converter according to claim 1, characterized in that, in order to increase the temperature stability, two anti-parallel diodes having thermal contact with the diodes of the DLC filter are introduced into the series circuit