SU1372539A1 - Variable a.c. to a.c. voltage converter - Google Patents

Abstract

The invention relates to a converter technique. The purpose of the invention is to increase reliability and decrease output voltage. The voltage regulation in the device is carried out by changing the state of single-ended power cells (CCF). Each of the CCS operates at a frequency higher than the mains frequency, which is set by the master oscillator. The CCM operates in antiphase. In the first part of the period, the high-frequency transformer of one of the USC is demagnetized, and an operating voltage is applied to the windings of the high-frequency transformer of the other USC. 2 hp f-ly, 5 ill. (L

Description

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The invention relates to converter equipment and may find application in power supplies for electronic equipment of communication means.

The purpose of the invention is to increase reliability and reduce distortion of the output voltage.

FIG. 1 shows the functional scheme of the device; in fig. 2 shows an embodiment of a pulse distributor; in fig. 3 is a functional diagram of the power part of the device, made on the booster structure; in fig. 4,5 - timing diagrams explaining the operation of the device.

The device (Fig. 1) contains input 1 and output 2 filters, two single-ended power cells 3 and 4 and a control unit 5. Each one-stroke power cell 3 includes a demagnetization node 6, for example, on a symmetric voltage limiter and connected in parallel to the primary winding 7 of the high-frequency transformer 8, and alternating current keys 9-11, fully controllable. The primary winding 7 of the high-frequency transformer 8 is connected in series with the key 9 and connected to the terminals 12 and 13 of the input filter 1. The middle point of the secondary winding 14 is connected to the terminal 15 of the output filter 2, and its outermost terminals are connected to the terminal 16 through the keys 10 and 11 output filter 2 connected to the load 17.

Control unit 5 includes a generator 18, a T-flip-flop 19, a first 20, a second 21 and a third 22 pulse distributors, a saw-tooth generator 23, an amplitude detector 24, a subtractor 25 made on an operational amplifier, two comparators 26 and 27 and logic element 2I-NE 28. The output of the master oscillator 18 is connected to the inputs of the T-flip-flop 19 and the generator 23 of the saw-tooth voltage, the output of which is connected to the first inputs of the comparators 26 and 27 and the output of the amplitude detector 24. The output of the amplitude detector 24 is connected to an inverting input ohm subtractor 25, the direct input of which is combined with the second input of the comparator 26 and forms the input 29 for connecting the signal yn5

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the signal. The output of the subtractor 23 is connected to the second input of the comparator 27, the output of the comparator is connected to the information input 30 of the second distributor 21 and one of the inputs of the logic element 2I-NK 28, the other input of which is connected to the output of the comparator 26 connected to the information input 30 of the first distributor 20 And the output of the element 2I-NOT 28 is connected to the information input

30 of the third distributor 22. The first synchronization inputs 31 of the distributors 20 - 22 pulses are connected to the forward output of the T-flip-flop 19, and their second synchronization inputs

32 - to the inverse output of the T-flip-flop 19.

The control inputs of the keys 9 are connected to the paraphase outputs 33 and 34, respectively, of the third distributor 22 pulses, and the control inputs of the keys 10 and 11 are connected to the paraphase outputs 33 and 34 of the second 21 and first 20 distributors, respectively.

The distributor 20 pulses (Fig. 2) contains two elements 2I 35 and 36. One of the outputs of the element 2I 35 and 36 are combined and form the information input 30 of the distributor 20, the second input of the element 2I 35 forms the first clock input 31 of the distributor 20, and the second input of the element 2 and 36, the second synchronization input 32. In this case, the element outputs are paraphase outputs 33 and 34 of the pulse distributor 20.

To obtain the booster structure, the midpoints of the secondary windings 14 of high-frequency transformers 8 (Fig. 3) are connected to the output 12 of the input filter 1, and the extreme outputs of the windings 14, respectively, via the keys 10, 11 of the secondary switches to the terminal 15 of the output filter 2. Conclusions 13 and 16 input 1 and output 2 filters are combined. The pulse distributors transmit signals arriving at information inputs 30 to the control inputs of the keys in accordance with those arriving at the first

31 and the second 32 synchronizing / le voltage inputs 43 and 44 (Fig. 4) from the outputs of the T-flip-flop 19. Moreover, from the outputs of the 33 distributors gO-2 pulse sequences 45-4 /

arrive at the control inputs of the keys 9-11 of the single-ended power cell 3, and the ac outputs 34 of the voltage 48-50 to the control inputs of the keys 9-11 of the single-cycle power cell. Thus, the voltages from the outputs of the comparators 26 to 27 and the 2H-FiE element 28 are transmitted through the distributors 20-22 pulses on one clock of the master oscillator 18 to the control inputs of the keys 9-11 of the one-stroke power cell 3, and on the other clock Key inputs 9-11 of single-ended power cell 4.

At time t, in accordance with the pulse of the pulse sequence 47, the key 9 of the single-ended power cell 3 is closed and the supply voltage 51 (Fig. 5) is applied to the primary winding 7. The voltage 52 of the secondary winding 14 is applied through the closed key 10 to the output filter 2 and the load 17. On the time interval (Fig. 4, the next clock cycle), all the keys of the single-ended power cell 3 are open. The high frequency transformer 8 is demagnetized by the current flowing through the primary winding circuit 7 - demagnetization node 6, the nominal voltage of which is higher than the maximum amplitude value of the supply voltage. At time point 1j2, the keys 10 and 11 of the single-ended power cell 4 are closed, and the key 9 is closed in accordance with the signals on their control inputs. The high-frequency transformer 8 of the single-ended power cell 4 is closed. The voltage 53 on its secondary winding is zero. In interval t, key 9 is turned on, and key 11 is turned off. The primary winding 7 of the single-ended power cell 4 is connected to the mains supply, and the voltage 53 of the secondary winding 14 through the closed key 10 is fed to the output filter 2 and the load 17. In the next cycle, the high-frequency transformer 8 of the single-stroke power cell 2 is demagnetized, and the single-stroke power operates cell 1. On the time interval t.

keys locked simultaneously

9 and 11 of the single-ended power cell 3, and the voltage 52 of the secondary winding 14 of the high-frequency transformer 8 is applied to the output filter through the key 11 in polarity

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a supply voltage 51 of the supply network, thereby reversing the voltage 54 at the input of the output filter 2 and the output voltage 55 relative to the supply network voltage 51. In the next cycle of the intermediate frequency, the one-cycle power cell 4 operates similarly.

The power circuit of the device (Fig. 3), made according to the booster circuit, works similarly (Fig. 2). The magnitude of the voltage 56 at its output filter is determined by the algebraic sum of the voltage 51 of the supply network and the voltage of the secondary winding 14 connected to the output filter by the keys 10 and 11. The voltage 57 is acted upon by the voltage 57.

Claims (1)

1. Adjustable AC to AC converter, content input and output filters, the first single-ended power cell containing a high-frequency transformer, the primary winding of which is connected to the input filter through the first key, the secondary winding of the high-frequency transformer is made with a midpoint, and the extreme leads of the secondary winding combined via the second and third keys, the total point of which and the middle point of the secondary winding form the output pins of the single-ended power cell, besides The control unit contains a series-connected master oscillator and a phase-shifting unit, characterized in that, in order to increase reliability and reduce output voltage distortions, a second one-cycle power cell is introduced, made similar to the first, the output terminals of which are connected in parallel to the output terminals the first power single-phase cell, a T-trigger, an amplitude detector, a first comparator, a subtractor are entered into the control unit. element 2I-NOT and three distributors of the pulses, the phase-shifting unit is made in the form of series-connected generator of the saw-tooth voltage and the first input of the second comparator, the second input of which is connected to the output for connecting the control signal and to the direct input of the subtractor, inperty 1Z 5J 34 3 / --Г- 12 at / 0/3 37 / g five "7 four  L7 ЪО 32 FIG. 2 iS - five in th 2 yo 1c / 7 Fig.Z Jig