RU1818621C - Direct-to-direct voltage converter - Google Patents

Abstract

Usage: the invention can be used in electric energy converters, in particular for powering on-board microelectronic equipment of aerospace objects. SUMMARY OF THE INVENTION: a dc-to-dc converter comprises a first power unit 17 from a dc-to-ac converter, the input of which through the stabilizer 19 is connected to the input terminals and rectifier 21. The device also contains an output filter 24, the oscillator 1 , the first push-pull signal generating unit 3, consisting of trigger 5, two coincidence circuits 7 and 8, and pause pulse shaper 11. In order to reduce the level and reduce the spectrum of excited radio noise, a counting trigger 2 is introduced. Torah node 4 form a push-pull signal, four integrating unit 13- 16, the second power node 18 and the voltage sensor 20 at the output of the converter DC voltage into AC power of the first node. 2 ill.

Description

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League

The invention can be used in electric energy converters, primarily for powering on-board microelectronic equipment of aerospace objects.

The purpose of the invention is to reduce the level and spectrum of the excited radio interference.

In FIG. 1 is a circuit diagram of a device; Fig. 2 is a diagram of stresses explaining operation.

The output of the master oscillator 1 (Fig. 1) is connected to the input of the trigger 2. The first output of the trigger 2 is connected to the input of the forming unit 3, a push-pull signal. The input of the forming unit 3 is connected to the input of the trigger 5 and the input of the pulse shaper pause 11, and the output of the latter to the outputs of the matching circuits 7 and 8. The outputs of the trigger 5 are connected to the inputs of the matching circuits 7 and 8. The outputs of the forming unit 3 through the integrating links 13 and 14 connected to the inputs of the DC / AC converter of the first power unit 17. The second output of the trigger 2 is connected to the input of the push-pull Signal generating unit 4. The input of the forming unit 4 is connected to the input of the trigger 6 and the input of the pause pulse generator 12, and the output of the latter is connected to the inputs of the matching circuits 9 and 10. The outputs of the trigger b are connected to the inputs of the matching circuits 9 and 10. The outputs of the forming unit 4 through the integrating links 15 and 16 connected to the inputs of the DC / DC voltage converter of the second power unit 18. The output of the stabilizer 19 is connected to the midpoint of the primary winding of the power transformer of the first power unit 17. The output of the stabilizer 20 is connected to the midpoint of the primary quipment power transformer of the second power unit. The outputs of the rectifiers 21 and 22 are connected to the output filter 24. The output of the voltage sensor 23 is connected to the feedback input of the stabilizer 20.

Figure 2 shows: a) the voltage at the output of the master oscillator 1; b) - voltage at the first output of trigger 2; c) - voltage at the second output of trigger 2; d) - voltage at the first output of trigger 5; e) - voltage at the first output of trigger 6; e) - voltage on the secondary winding of the transformer of the power unit 17; g) - voltage on the secondary winding of the transformer of the power unit 18; h) is the voltage at the output of rectifier 21 during its operation on a separate active load; i) - voltage at the output of rectifier 22

when it is working on a separate active load.

Upon receipt of the supply voltage, the master oscillator starts to work.

1. The rectangular pulses from its output go to the counting input of the trigger 2. The out-of-phase oscillations of the meander type from the outputs of the trigger 2 fall to the inputs of the forming units 3 and 4; Output Pulses

forming units 3 are shifted to each other by half a period of a rectangular voltage wave and have a delay by the length of the pause. Such signals are obtained due to the presence of trigger 5, matching schemes 7 and 8,

5 of the pause pulse generator 11. Similar signals are also obtained at the outputs of the forming unit 4. However, the pulses at the output of the forming unit 4 are shifted relative to the pulses at the output of the forming unit 3 by a quarter of the period. The voltage on the secondary windings of the power units 17 and 18 has a trapezoidal shape with rounded corners. The power transistors of the power units 17 and 18 are in either cutoff mode or saturation mode for 5 s. Smooth switching of transistors is ensured by the presence of integrating links 13, 14, 15 and 16. At the outputs of rectifiers 21 and 22

0 voltages having dips, the duration of which is 20-30%.

However, since trapezoidal oscillations with rounded corners at the outputs of the power units 17 and 18 are shifted by a quarter of the period, time overlap occurs and the resulting voltage at the output of the filter 24 has a low ripple at the frequency of operation of the converters. Equality of the amplitudes of the half-waves at the outputs of the rectifiers 21 and 22 is ensured by monitoring the output voltage of the stabilizer 20 behind the output of the DC-DC converter to the alternating power unit 17.

5 in known voltage converters, the desire to reduce switching losses, lower the temperature of power transistors, increase efficiency leads to a reduction in the duration of the switching time of the transistors, and, consequently, to an increase in the level of generated interference. Thus, in the proposed device, despite the slow switching of transistors,

5 switching losses. Do not increase, and the efficiency does not deteriorate, the temperature of the transistors does not increase, but at the same time, the generated radio interference is significantly attenuated, which is caused by both smooth switching of the transistors and the absence of short-term bursts in the rectifier circuits due to accumulation charge in diodes.

Using the proposed power source in comparison with the base object will allow:

to improve the reliability of the operation of high-sensitivity broadband microelectronic radio receivers, in particular on long-distance space radio links:

- use in conjunction with the proposed power source as part of the on-board microelectronic radio complex such devices as frequency multipliers, primary frequency standards.

Claims (1)

SUMMARY OF THE INVENTION A dc-to-dc converter comprising a first power unit from a dc-to-ac converter, the input of which is connected to the input terminals through a stabilizer and is rectified, an output filter that defines a generator, a first push-pull signal generating unit, consisting of from a trigger connected by the first inputs to its outputs of two matching circuits and a pause pulse generator, the input of which is connected to the trigger input, and the output - with the second inputs of the matching circuits, characterized in that, for the purpose of to reduce the level and narrow the spectrum of excited radio interference, a counting trigger, a second push-pull signal generating unit, four integrating links, a second power unit, a voltage sensor at the output of the DC-DC converter to the variable of the first power unit are introduced, while the output of the master oscillator is connected to the input a counting trigger, the outputs of which are connected to the inputs of the corresponding nodes for generating the push-pull signal, the outputs of each of which are connected to the inputs through the corresponding integrating links ladder control constant voltages into alternating current of the first and second power units, the outputs of the rectifiers of which are connected in parallel to the output filter, in addition, the output of the voltage sensor at the output of the DC / AC converter of the first power unit is connected to the input of the feedback loop of the second power stabilizer node. "/ V w 3 f f