SU1439554A1 - Bipolar d.c. voltage source - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to sources of secondary power supply for automation systems and computer technology. The purpose of the invention is to ensure stability and equality of output voltages. The device is based on a 2-pulse generator and an inductive drive 14, which is connected to a common power source 1 via controlled electronic switches 12 and 13. The accumulated energy through rectifying diodes 15 and 16 is fed to different outputs. The discrete change in the duty cycle of control pulses, consisting of triggers 3-6, elements 3 AND-NOT 7-9, the element NOT H and comparator 11, monitors the values of the output voltages and automatically maintains them by changing the amount of pump energy in the output - pi. In order to eliminate the imbalance between the output voltages, resistors 17 and 18 and leveling transistors 19 and 20 are provided. 2 sludge. (L

Description

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The invention relates to electrical engineering and is intended for use in the implementation and secondary power supply of automation and computer systems.

The aim of the invention is to ensure stability and equality of the output voltages.

FIG. Figure 1 shows the functional scheme of the described two-point: pn source of direct current voltage; in FIG. 2a-3 are timing diagrams of signals illustrating its operation.

The device contains a common power source 1, a generator of 2 pulses, triggers 3-6, the first 7, the second 8 and the third 9 ZI elements, the NO element

ten

15

respectively, the electronic switches 12 and 13. The signal input of the comparator 11 is connected between one of the output pins, for example 24, and the other zero potential. The collectors of the equalizing transistors 19 and 20 are connected to the output pins 23 and 24, respectively, and the emitters are connected to the zero potential bus. Resistors 17 and 18 are connected between the collectors of the equalizing transistors 19 and 20 and the interconnected bases.

The device works as follows.

When the generator 2 is excited, on the forward and inverse outputs of the triggers 3-6, impediments appear and, Uj, and, 4 s S 6 6 some of the ko-10, comparator 11, are electronic (the second ones are shown in Fig. 2a -a. On you-30

35

resistor switches 12 and 13, inductive drive 14, rectifying diodes 15 and 16, resistors 17 and 18, leveling transistors 19 and 20, fi plugs capacitors 21 and 22, 25 different output outputs 23 and 24. Generator 2 output the pulses are connected to the counting input of trigger 3, in series with which triggers 4–6 are connected, which together form a four-bit asynchronous counter.

The electronic switches 12 and 13 are connected by the first power leads (emitters) to the corresponding poles of the common power source 1, one of which is connected to a pin of zero potential. Inductive drive 14 is installed between the second power outputs (collectors) of the electronic switches 12 and 13. The forward diodes 15 and 16 are connected between the corresponding outputs of the inductive drive 14 and the opposite output terminals 23 and 24 connected via filter capacitors 21: n 22 with a zero bus potential. The inputs of the element ZI-NOT 7 are connected to the direct outputs of the triggers 3 and 4 and the output of the comparator 11. The inputs of the elements ZI-NOT 8 are connected to the output of the element ZI-HE 7 and the inverse outputs of the triggers 5 and 6. The inputs of the element ZI-HE 9 are connected to the output element ZI-NOT 7, the inverse output of the trigger 5 and

direct trigger output 6. The output of the ZI-NOT 8 element is through the NOT 10 element, and the output of the ZI-NO 9 element is directly connected to the control inputs

40

45

50

in the condition of the element ZI-NOT 7, under conditions of non-operation of the comparator 11, a positive signal takes place,

From the outputs of the element HE 10 and the element ZI-HE 9, the impulses I5 + Ug and I + Ug shown in FIG. 2 Well, solid lines.

During the first phase of the charge, when the electronic switches 12 and 13 are closed, energy is accumulated in the inductive storage device 14 due to the flow of current increasing in amplitude.

In the second phase, the discharge electronic key 13 is open, the electronic key 12 is closed and the energy from the inductive storage device 14 is transmitted to the positive output voltage bus, i.e. to output pin 24.

In the third phase of the charge, the electronic switches 12 and -13 are closed and the inductive drive 14 again accumulates energy.

In the fourth phase, the discharge of the electronic key 12 is open, the electronic key 13 is closed and the energy from the inductive storage device 14 is transmitted to the negative output voltage bus, i.e. to the out; one conclusion 23.

The switching frequency of the electronic switches 12 and 13 is determined by the operation of the pulse generator 2.

To ensure the stability of you. voltage input when changing the input voltage or load currents is the discrete node HTNfeHPtmH

respectively, the electronic switches 12 and 13. The signal input of the comparator 11 is connected between one of the output pins, for example 24, and the wrong zero potential. The collectors of the equalizing transistors 19 and 20 are connected respectively to the output pins 23 and 24, and the emitters are connected to the zero potential bus. Resistors 17 and 18 are connected between the collectors of the equalizing transistors 19 and 20 and the interconnected bases.

The device works as follows.

When the generator 2 is energized, impediments and, Uj, and, 4 s S 6 6 appear on the direct and inverse outputs of the triggers 3-6, some of which are shown in FIG. 2 aa On you-0

five

five

0

five

0

in the condition of the element ZI-NOT 7, under conditions of non-operation of the comparator 11, a positive signal takes place,

From the outputs of the element HE 10 and the element ZI-HE 9, the impulses I5 + Ug and I + Ug shown in FIG. 2 Well, solid lines.

During the first phase of the charge, when the electronic switches 12 and 13 are closed, energy is accumulated in the inductive storage device 14 due to the flow of current increasing in amplitude.

In the second phase, the discharge electronic key 13 is open, the electronic key 12 is closed and the energy from the inductive storage device 14 is transmitted to the positive output voltage bus, i.e. to output pin 24.

In the third phase of the charge, the electronic switches 12 and -13 are closed and the inductive drive 14 again accumulates energy.

In the fourth phase, the discharge electronic key 12 is open, the electronic key 13 is closed and energy from the inductive storage device 14 is transmitted to the negative output voltage bus, i.e. to the out; one conclusion 23.

The switching frequency of the electronic switches 12 and 13 is determined by the operation of the pulse generator 2.

To ensure the stability of you. voltage input when changing the input voltage or load currents is the discrete node HTNfeHPtmH

the duty cycle of the pump is 1Wx and the pulses, consisting of triggers 3-6, elements ZI-NOT 7-9, element NOT 10 and comparator 1 1.

When the output voltage of a positive polarity decreases due to an increase in the load current or a change in the input voltage, the comparator 11 causes the enable signal corresponding to the input of the ZI-NE element 7, which in this case begins to generate pulses U- (Fig. 2e). When leading pulses U to the inputs of the ZI-HE elements 8.9, as a result of logical interaction with the remaining input pulses, the duration of the phases of the discharge decreases, and the duration of the phases of the charge increases (Fig. 2g, L, dashed line). Therefore, the energy accumulated in inductive storage device 14, and the value of the previously decreased positive polarity increases.

Elimination of misalignment of different-pitch output voltages is accomplished with the help of resistors 17 and 18, and wiring transistors 19 and -20. When the negative output voltage decreases, the transistor 20 opens, and shunts the output of the positive output voltage, discharging the capacitor 22 and decreasing it. the value of this output voltage until the difference in the two output voltages is zero. Thereafter, the transistor 20 is closed. When the positive voltage decreases, the transistor 19 works similarly.

Leveling the output voltages; the devices reduce their magnitudes and then the discrete variation of the duty ratio starts working, which raises the output voltages to the nominal value.

Thus, in the described power supply, stable and equal in voltage values are automatically maintained at the output terminals when the input voltage and load currents change.

F o rm invented

D} zuhpach is a p1 th voltage source, containing a pulse generator, the output of which is connected to the counting input of the first trigger, two electronic switches connected by first power leads to the corresponding poles of the common power supply, one of which is connected to the zero potential bus, an inductive drive installed between the second power outputs of the electronic switches, two rectifier 5 ny diodes connected between the corresponding outputs of the inductive drive and the different polarity of the output. two resistors connected via filter capacitors to a zero potential bus, characterized in that, in order to ensure stability and equality of output voltages, the second, third and fourth heres are introduced into it, three elements , a comparator and two equalizing transistors of different conductivity type, the second, third and fourth triggers are connected in series with

0 by the first trigger, the inputs of the first element ZI-NOT are connected to the direct outputs of the first and second triggers and the output of the comparator, the inputs of the second element ZI-NOT are connected to the output

g the first element ZI-NOT and inverse outputs of the third and fourth triggers, the inputs of the third element ZI-NOT connected to the output of the first element 2I-NOT, the inverse output of the third

0 trigger and direct output of the fourth trigger, the output of the second element ZI is NOT through the element NOT, and the output of the third element ZI is NOT directly connected to the control inputs

5 corresponding electronic switches, a comparator signal input is connected between one of the output pins and a zero potential bus, leveling transistor collectors are connected to the corresponding output pins, and emitters are connected to a zero potential bus, resistors are connected between collectors of transistors and connected between

55

a base.

Claims (1)

Formula of the invention A bipolar DC voltage source containing a pulse generator, the output of which is connected to the counting input of the first trigger, two electronic keys connected by the first power leads to the corresponding poles of a common power source, one of which is connected to the zero potential bus, an inductive storage, installed between the second power terminals of the electronic keys, two rectifier 15 diodes connected between the corresponding terminals of the inductive storage and the bipolar output, outputs connected through filtering capacitors with a bus of zero potential 20, two resistors, characterized in that, in order to ensure stability and equality of output voltages, the second, third and fourth trig25 gers, three elements ZI-NOT, an element NOT , a comparator and two leveling transistors of different types of conductivity, and the second, third and fourth triggers are connected in series with 30 by the first trigger, the inputs of the first ZI-NOT element are connected to the direct outputs of the first and second triggers and the comparator output, the inputs of the second ZI-NOT element are connected to the output 35 of the first ZI-NOT element and the inverse outputs of the third and fourth triggers, the inputs of the third ZI-NOT element are connected to the output of the first 2I-NOT element, the inverse output of the third 40 trigger and the direct output of the fourth trigger, the output of the second ZI-NOT element and the output of the third element is ZI-NOT directly connected to the control inputs 45 corresponding electronic keys, the signal input of the comparator is connected between one of the output terminals and the zero potential bus, the collectors of the leveling transistors are connected to the corresponding output terminals, and the emitters are connected to the zero potential bus, the resistors are connected between the collectors of the leveling transistors and connected between 55 by itself bases. C c e C c s E C c s, e C E E E E E E E E E E