RU37890U1 - DC VOLTAGE SOURCE WITH 12X PULSATION FREQUENCY - Google Patents

Description

Constant VOLTAGE SOURCE with 12 - MULTIPLE FREQUENCY

The utility model relates to electrical engineering and power converting equipment and is intended to convert an alternating voltage to a direct voltage for supplying traction ducts of electric vehicles and direct current electrotechnological installations.

A known source of constant voltage with a 12-fold ripple frequency, containing gates and two sources of the initial variable EMF, each of the two parts with taps phase-shifted orthogonally to each other, while one of the taps of the second source phase-shifted (FS) EMF is made from the middle points and forms one output terminal, while the sources of the FS EMF are additionally equipped with a corresponding number of conclusions, the other output terminal is formed by one of the taps of the first source of the FS EMF 1.

The disadvantage of this device is the large number of separate, galvanically interconnected secondary windings of transformers and a large number of their turns, which leads to a significant amount of installed power, poor overall dimensions and, as a result, the ability to use the device to power only low-power and low-voltage consumers.

Closest to the utility model adopted as a prototype is a constant voltage source with a 12-fold ripple frequency, containing two source transformer sources of variable EMF shifted in phase orthogonally to each other, and

twelve gates, each source of the EMF FS has two secondary windings with midpoints, and the terminals of the windings in each source are connected to two own unidirectional circuits, consisting of three in series and according to the valves turned on, with each pair of terminals of each winding connected to a pair points of series connection of valves equidistant from the ends of the chains in such a way that antiphase leads of the windings are connected to the opposite electrodes of the middle valves of the chains, while the same electrodes of the extreme valves in each pair of chains are connected and in one pair of chains one connection point of the same electrodes forms one of the output terminals of the device, and in the other pair of chains the connection point of electrodes of the opposite name forms the second output terminal of the device, each unused connection point of the extreme electrodes valves of the chains is connected to the midpoint of the winding, opposite the given chains and connected by its terminals to the valves of their own chains, the genera of which form the output terminals of the device, and the idle midpoints of the other two windings are interconnected 2.

The disadvantage of this device is the significant difference in the average currents flowing through the valves of different groups of the rectifier and the difference in the reverse voltages applied to them, which forces the manufacturer to use valves of different ratings in power. In addition, at any time, the rectified current passes through four series-connected valves, which causes certain power losses in the rectifier.

The objective of the utility model is to create a constant voltage source with a 12-fold ripple frequency, which has less power loss in the rectifier and less uneven valve loading.

еШ1 (20

This problem is achieved by the fact that in a DC voltage source with a 12-fold ripple frequency, containing two source transformer sources of variable EMF shifted in phase orthogonally to each other, and twelve B-12 gates, each source of FS EMF has two secondary windings with midpoints, and each of the extreme terminals of one of the windings in each source of the FS EMF is connected to the beginning of its own sequential chain, consisting of two valves having the same direction of inclusion in one source and counter the positive direction of inclusion in the other, the extreme electrodes of the same valve gates are connected in pairs, forming the output terminals of the device, each of which is connected to the load and to the midpoint of the winding connected by its findings to its own chains of valves forming the opposite output, and the midpoints of the two remaining unused winding interconnected, and their conclusions are connected to the points of the serial connection of the gates of the chains of the opposite source, while the conclusions of the beginnings of these windings oedineny chains with valves connected to opposite ends of the source coils, wherein each output winding coupled to the principles of chains is further connected via valves with a unidirectional valve chains with the serial connection point of valves adjacent chains.

Figure 1 shows a schematic diagram of a model of the proposed source; figure 2 - wave diagram of stresses; on Fig.3 vector diagram of the current-forming EMF; figure 4 - equivalent circuit secondary circuits for time intervals multiple of 90 el.grad .; in FIG. 5 - operation algorithms of the secondary windings of the source transformers and algorithms for turning on the valves.

A DC voltage source with a 12-fold ripple frequency (Fig. 1) contains two source transformer sources of variable EMF 1 and 2 (the primary windings of the transformers are not shown in the diagram).

phase shifted orthogonally to each other, and twelve valves 3 ... 14. Both sources of phase-shifted EMFs have two secondary windings 15, 16 and 17, 18, respectively, with midpoints 19, 20, and 21, 22. In one source of the FS EMF, the winding 15 is connected by terminals with the beginnings of unidirectional valve chains consisting of two valves 3 , 4 and 6,7, and in another source the winding 18 is connected by terminals with the beginnings of valve chains having an opposite direction of connection with respect to the aforementioned chains, and consisting of two valves 10.11 and 13.14 each. The same electrodes of the last valves of the chains 4.7 in one and 11.14 in the other source are connected, forming the output terminals of the device 23 and 24, to which the sleeve 25 is connected, and to the terminal 23 the midpoint 22 of the winding 18 of the source 2 is connected, and to the terminal 24 connected, respectively, the middle point 19 of the winding 15 of the source 1. The midpoints 20 and 21 of the windings 16 and 17 are interconnected, and the ends of the windings are connected to the midpoints of the valve chains connected to the windings of the opposite source: the beginning of the winding 16 is connected to the point of the connections of valves 13 and 14, the end-to-point connections of gates 10 and 11; the beginning of the winding 17 is connected to the connection point of the valves 6 and 7, the end to the connection point of the valves 3 and 4. The start of each valve chain is also connected through a single unidirectional valve with the chain valves to the serial connection point of the valves of the adjacent chain, that is, the output of the winding 15 connected to valve 3 is connected through valve 5 to the connection point of valves 6 and 7, and the output connected to valve 6 is connected through valve 8 to the connection point of valves 3 and 4; the output of the winding 18 connected to the valve 10 is connected through the valve 9 to the connection point of the valves 13 and 14, and the output connected to the valve 13 is connected through the valve 12 to the connection point of the valves 10 and 11.

(Figure 2), vector (Figure 3) diagrams and equivalent secondary circuits (Figure 4) for time intervals determined by the phase change period of the orthogonal EMF, i.e. 90 el. degrees. Wave diagrams and equivalent circuits illustrate the principle of formation of voltages on the secondary windings of transformer sources of EMF and the curve of the rectified voltage at active load over a quarter of the period of the alternating voltage of the sources of FS EMF. Figure 3 shows the operation algorithm of the semi-windings of the sources of the EMF source and the algorithm for switching on the gates for the period of the mains voltage with a switching discreteness corresponding to one pulse of the rectified voltage.

From the algorithms (Fig. 3) it can be seen that winding 13 in the first and winding 18 in the second sources of the FS EMF are involved in the conversion process of 122.4 el. hail, for the period, and winding 16 in the first and winding 17 in the second sources of the FS EMF are involved in the conversion process of 180 el. hail for the period.

The relative numbers of turns are equal: for semi-windings 16a, b and 17a, b1.0; for semi-windings 13a, b and 18a, b - 0.43. The total sum of the relative numbers of turns is 3.8.

Taking into account the relative number of turns of the semi-windings indicated earlier, it is possible to determine the total coil number of the secondary windings of the sources of the FS EMF WB2 WS / WB. This number shows the ratio of the total total number of turns Wj of all parts of the secondary windings to the base number of turns WE, which is equal to the number of turns with an amplitude of voltage on them equal to the amplitude Udo of the output voltage in the idle mode of the device. The basic number of turns for the proposed device is determined on the basis of wave diagrams (Figure 2) and is equal to WE 2.03. Then the total revolution number WB2 is 2.83. The installed capacity of the model transformers is 1.183 when the model transformers are powered from a two-phase orthogonal network, or

1.274 when powered from a three-phase network via a transformer for number of phases. The valves in the device are loaded evenly, since eight of them conduct a current of 61.24 el. city., four 57.68 e. hail, for the period, while the prototype has four valves working 180, four 122.32 and four - 57.68 e. degrees. Close values of average currents and applied to the valves during the period of the mains voltage reverse voltage allow the use of valves of the same power. From the equivalent circuits of the secondary circuits (Figure 4) and the switching algorithm of the valves (Figure 5) it is seen that the load current circuit contains two valves, while the prototype has four valves in this circuit. The relative values of the currents flowing through the secondary windings of transformers of the model 0.7071 and 0.5831 differ less than the values 0.9164 and 0.7071 of the prototype, which makes it possible to unify the model not only by the valves used, but also by the winding wires.

Thus, the proposed source reduced power loss in the rectifier and reduced the uneven loading of the valves.

Sources of information taken into account during the examination:

1.A.S. USSR No. 1086524. A constant voltage source with an n-fold pulsation frequency / A.M. Repin-3440785 / 24-07; Claim 05/21/82; Publ. 04/15/84; Bull. No. 14.

2. RF patent N ° 34041. A constant voltage source with a 12-fold ripple frequency / Evdokimov S.D., Vorfolomeev G.N., Schurov N.I., Myatezh S.V. // 2003119757/20; Claim 07/01/03; Publ. 11/20/03; Bull.№ 32.

Claims (1)

A DC voltage source with a 12-fold ripple frequency, containing two source transformer sources of variable EMF phase-shifted orthogonally to each other, and twelve valves, each source of phase-shifted EMF has two secondary windings with midpoints, characterized in that each of the extreme the conclusions of one of the windings in each source of phase-shifted EMF is connected to the beginning of its own sequential circuit, consisting of two valves having the same direction of inclusion in one source and opposite the opposite direction of switching, the extreme electrodes of the same valve gates are connected in pairs, forming the output terminals of the device, each of which is connected to the load and to the midpoint of the winding connected by its terminals to its own chains of gates forming the opposite terminal, and the midpoints of the two remaining unused windings are interconnected, and their conclusions are connected to the points of the serial connection of the gates of the chains of the opposite source, while the conclusions from the beginning of these windings are are connected to the valves of the chains connected to the ends of the windings of the opposite source, and each terminal of the windings connected to the beginning of the chains is also connected via a valve unidirectional to the valves of the chains with the point of series connection of the valves of the adjacent chain.