RU1833959C - Single-cycle converter of dc voltage - Google Patents

Abstract

Usage: in the sources of secondary power of electronic equipment. SUMMARY OF THE INVENTION: between the input terminal (1) of the DC / DC converter and the terminal of the input capacitor (3), a current limiting resistor (14) is connected, shunted by a thyristor (15), the control electrode of which is connected to the terminal of the primary winding (7) of the power transformer (8) ) and the cathode of the diode (16), the anode of which is connected to the output of the input capacitor (3). The charge current of the input capacitor (3) is limited to a level safe for the network and the elements of the converter, which determines an increase in the reliability of the voltage converter. 2 ill. L (L C ft n / J 00 CA) SO O eche

Description

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

The aim of the invention is to increase reliability.

Fig. 1 is an electrical diagram of the proposed DC / DC converter; in FIG. 2 is a timing diagram illustrating its operation.

The DC / DC converter contains input terminals 1 and 2, an input capacitor 3, connected by a single output to the input terminal 2 of the converter through a circuit from a series-connected power transistor switch 4 and an input jumper 5, an isolation capacitor b, connected to a power transistor connection point by one terminal key 4 and input throttle 5, a: the second - to the first output of the primary winding 7 of the power transformer 8, the secondary winding of which 9 through the rectifier 10 and the filter 11 is connected to the output Odes of the converter 12, 13 and the load R N. Between the input terminal 1 and one terminal of the input capacitor 3, an inserted resistor 14 is connected, shunted by the inserted thyristor 15, the control electrode of which is connected to the other terminal of the primary winding 7 of the power transformer 8 and the cathode of the input diode 16, the anode of which is connected to one terminal of the input capacitor 3. The input of the power transistor switch 4 is connected to the output of the control device 17.

The DC / DC converter operates as follows.

When the input voltage is applied to the terminals 1, 2 of the converter, the input capacitor 3 is charged through the resistor 14, so that its charge current is limited to a safe value both for the input network and for the elements of the voltage converter circuit. After the charge of the capacitor 3 has ended, a control signal from the control device 17 is supplied to the power transistor switch A. The current 14 flows in the circuit 3-4-5-3 (time interval 11-12 in Fig. 2). The rectified voltage from the secondary winding 9 of the power transformer 8 through the rectifier 10 and the filter 11 is supplied to the output terminals of the converter 12, 13. In addition, at the same time interval, it was previously charged to the input voltage through the circuit 3-16-7 -6- 3 isolation capacitor 6 is discharged along the circuit 6-7-15-4-6, creating a current in the control electrode of thyristor 15

I (Y315) (see FIG. 2). As a result, the thyristor 15 opens and shunts the resistor 14, which eliminates power dissipation in it.

At time 12, a blocking voltage is applied to the power transistor switch 4 from the output of the control device 17, the power transistor switch 4 is closed and the isolation capacitor 6 is charged (current path 3-16-7-6-5-3).

At time 13, the power transistor switch 4 is opened again and the processes are repeated,

The present invention has a number of the following technical and economic advantages over the known technical solution:

increased reliability, this is

This is because when the input voltage is applied to the input terminals of the converter, the charge current of the input capacitor is limited by the current limiting resistor to a safe level. In the well-known technical solution, the charge current of the input capacitor is not limited, which can lead to failure of both the input rectifier diodes and the input filter capacitor, in addition, when used in

0 known technical solution of the traditional chain of limiting the charging current of the input capacitor, the low reliability of the converter is due to the large number of elements of the specified chain,

5 of the proposed solution, fewer additional elements are used in the charging current limiting circuit of the input capacitor, which increases reliability.

0 The expected economic effect of using the proposed converter in secondary power sources of technical equipment and models of EU computers will be 5,000 rubles. per year (approximately 5).

At the filing date, prototypes of IVEP EC computers were made using. By using the proposed technical solution, design tests were carried out.

Claims (1)

Introduction to serial production of these IWEP is planned since 1992 according to the thematic plan of the enterprise. The claims 5 A single-phase DC / DC converter containing a power transistor connected through an input inductor to an input capacitor connected to input terminals through a current-limiting resistor shunted by a thyristor, the control electrode of which is connected to the diode cathode, a power transformer whose primary winding is connected by its first terminal with the first output of the isolation capacitor, and the secondary winding through the rectifier and the filter is connected to the output terminals, characterized in that, in order to expand the frequency range, the second output of the isolation capacitor is connected to the emitter of the power transistor connected to the input choke, the second output of the primary winding is connected to the cathode of the diode, the anode of which is connected to the collector of the power transistor. 4 & r.S Ј /