SU1534437A1 - On-off pulsed dc voltage stabilizer - Google Patents

Abstract

The invention relates to the secondary power supply sources of electronic equipment. The purpose of the invention is to increase reliability by eliminating the possibility of magnetizing the core of a power transformer of a key converter due to time unbalance of control signals. The key converter 2 is controlled by output pulses generated by signals from the outputs of the elements 6 and 8 by the power amplifier 7. The output voltage of the device is compared with a reference voltage comparator 4, at the output of which a logical unit signal is generated in case the output voltage is lower than the specified one. The generator 5 of opposite-polarized rectangular pulses generates asymmetrical voltages at its outputs, and the duration of the pulses at its second output is equal to the guaranteed locked state of the transistors of the key converter, which excludes the appearance of "through currents" in it. The pulses from the second output of the generator 5 different-polarized rectangular pulses synchronize the switching of the D-flip-flop 11, making it possible to switch with a frequency two times smaller than the frequency of the generator 5. Thus, at the output of the elements 6 and 8, only a pair of pulses duration, determined by the voltage at the first output of the generator 5. The voltage at the output is controlled by varying the number of pairs of asymmetric pulses arriving at the control inputs of the key converter L 2 output from the power amplifier 7. 2 Il.

Description

The invention relates to electrical engineering, in particular, to devices for stabilizing secondary power supply of electronic and computer equipment.

The aim of the invention is to increase the reliability by eliminating the possibility of magnetization of the core of the output transformer of the key converter due to the time unbalance of the control signals.

Fig. 1 shows a functional diagram of a DC / DC relay; Fig. 2 shows timing diagrams explaining its operation.

The DC relay voltage regulator contains a mains rectifier 1 with a filter whose inputs are input terminals, and the outputs are connected respectively to the power inputs of a key voltage converter 2 with an output transformer whose outputs are connected to the inputs of the output rectifier 3 with a filter The outputs of which are connected to the output terminals and the input of the voltage comparator 4, the generator 5 of different polarized rectangular pulses, the first output of which is connected to the first input of the first element I 6, output D which is connected to the first input of the power amplifier 7, to the second input of which the output of the second element I 8 is connected, and the outputs of the power amplifier 7 are connected respectively to the control inputs of the key transducer

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the voltage generator 2, the first counting trigger 9, whose input is connected to the first generator output 5 of different polarity rectangular pulses, to which the first input of the second element And 8 is also connected, to the second input of which the second output of the first counting trigger 9 is connected, the second generator output 5 opposite rectangular pulses connected to the input of the second counting trigger 10, D-flip-flop 11, the output of which is connected to the third inputs of the first and second elements And 6 and 8, the information input of the D-flip-flop connected to the output of the comp Attenuator 4 is voltage, and the synchronization input is connected to the output of the third element 12, to the first input of which is connected the second output of the generator 5 multi-polar rectangular pulses, and to the second output to the second counting trigger 10.

The relay voltage pulse stabilizer operates as follows

In the established operating mode, the voltage comparator 4 compares the voltage regulator - feedback (OC) coming to its input from the output voltage stabilizer - feedback voltage (OC), amplifies the error signal and converts it into a level-matched signal. with signals of logic elements. In this case, in the case of a decrease in the operating voltage relative to a predetermined value at the output

the voltage torus, a signal is generated (Logic 1, and in the case of an increase, a logic O signal. The output signal of the voltage comparator 4 is fed to the information input of D-flip-flop 11. A feature of D-flip-flop 11 is that the signal changes at its information input cause changes at the output only if the logical input 1 signal is present at the synchronization input. If there is a logical 0 signal at the synchronization input, the D-flip-flop output retains its state when the signal changes at the information input. The trigger is in the storage mode. To use this mode of operation of the D-trigger 11, the device has a counting trigger 10 and an And 12 element, the inputs of which receive a signal from the second output of the generator 5 of different polarity rectangular pulses. positive pulses are formed, the duration of which is equal to the duration of the positive pulses at the second generator output of 5 opposite-rectangular pulses, and the repetition period of these pulses is twice as long as the repetition period of the pulses at the output g generator 5. The polling pulses generated by the AND 12 element are fed to the synchronization input of the D-flip-flop 11. The output signal of the D-flip-flop 11 under the influence of changes in the OC signal voltage amplified and converted by the comparator 4 can occur only when there is a polling pulse at the sync input D- trigger 11, and in the intervals between the polling pulses, changes in the OS signal do not cause changes in the output signal of the D-trigger 11, since the trigger is in the storage mode. The output of the D-flip-flop is fed to the inputs of elements 6 and 8. These elements, together with the counting trigger 9 and the power amplifier 7, are used to generate the transistor control pulses of the key voltage converter 2. The control pulses are formed by the indicated elements from a sequence of pulses taken from the first output of the generator 5 of differently polarized direct-. coal pulses. The pulses at the outputs of the generator 5 are paraphase. Impulses

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removed from the first output of the generator 5, are divided in frequency by the counting trigger 9 and, in antiphase, arrive at the corresponding inputs of the AND 6 and 8 elements. In addition, the pulses from the generator 5 of opposite polarity pulses arrive at the inputs of the AND 6 and 8 elements directly, which allows you to create a pause of a fixed duration between the pulses that control the operation of the transistors of the key voltage converter 2. The duration of the pulses and pauses is rigidly set by the frequency and duty cycle of the signal from the generator 5 of different polarized rectangular pulses.

The output of the pulses controlling the operation of the transistors of the key voltage converter 2 is such that when there is a D-flip-flop in the gap between two adjacent polling pulses of the logical 1 signal, the output of the And 6 and 8 elements is formed Pulses that are amplified by the power amplifier 7 and fed to the control inputs of the key voltage converter 2. If in the interval between two adjacent polling pulses at the output of the D-flip-flop there is a logical O signal, then the pulses at the outputs of the And 6 and 8 elements are not generated. Thus, a closed-loop circuit is implemented using an OS. Voltage control system at the output of the device.

The time diagrams (FIG. 2) show the main signals of the considered functional voltage regulator circuit. It follows from them that the key voltage converter is always controlled by pairs of pulses with a phase shift of 180 ° and with a pause between pulses. Such modes of operation of the voltage regulator are excluded, when the control pulses of the key converter have a different duration (temporal asymmetry), leading to magnetization of the output transformer of the converter

Claims (1)

Invention Formula A DC relay voltage regulator containing a mains rectifier whose inputs are connected to the input terminals, and the outputs through a power filter are connected respectively to the power inputs of the key voltage converter with an output transformer, the outputs of which are connected to the inputs of the output rectifier, whose outputs through the output filter are connected to the output terminals and the voltage comparator input, a generator opposite rectangular pulses, the first output of which is connected to the first input of the first element I, the output of which is connected to the first input of a power amplifier, to the second input of which The output of the second element I is connected, and the outputs are connected respectively to the control inputs of the key voltage converter, so that, in order to increase reliability by eliminating the possibility of magnetizing the core of the output transformer of the key alternator, due to time asymmetry of the control signals, two counting triggers, a D-flip-flop and a third And element, are introduced into it, and a generator of opposite-polarity rectangular pulses is made asymmetric with a pulse duration on it. the second output is equal to the guaranteed time of the locked state of the transistors of the key voltage converter, while the input of the first counting trigger is connected to the first output of a generator of alternating rectangular pulses, to which the first input of the second element is also connected, the first output of the first counting trigger is connected to the second the input of the first element is And, the second output of the first counting trigger is connected to the second input of the second element And, the second output of the generator of polarized rectangular pulses not with the input of the second counting trigger and with the first input of the third element And, to the second input to the second connected zyho / t of the second counting 4 trigger, the output, 0-trigger connected to the third inputs of the first and second elements And, information input D- the trigger is connected to the output of the voltage comparator, and its synchronization input is connected to the output of the third element AND,  / general / lou s Sd / rodZ teHetwnopqS In / move 1 Tputzepa 9 d / hadz, rfuttepa $ SxodZ fcutfifpoMvjenivg} & triggers 3X0fff (tsn naschgn L-7rTs12u 1N 6b / hd treMdt and b DyhoZ Element # S 2