SU930530A1 - Device for increasing m-phase voltage frequency - Google Patents

Description

(54) DEVICE FOR INCREASING THE FREQUENCY OF M-PHASE VOLTAGE The invention relates to a converter technique, in particular to devices with a higher voltage frequency, and can be used in automation and power converter technology. Selectively, a device for increasing the frequency of the m-phase voltage containing a transformer, the secondary windings of which are connected to controllable vents that are connected in the diagonal of the diode bridges. The cathode ends of the controlled valves are connected to a three-phase oscillatory circuit connected by c & a triangle and consisting of sequentially connected inductances, capacitances, and resistors connected to the outputs of the diode bridges. The valves are controlled by a system of additional transformers and control units. The frequency increase with the aid of this device is accomplished by summing the voltage of each phase and the voltage of the three-phase oscillatory circuit 1. The disadvantages of this device in-, are the structural ness and additional power loss in three-phase switching circuits. Also known is a valve multiplier with artificial kgalmuthia 2. Its disadvantages are the complexity and additional loss of power in three-phase xalmutation circuits. It is also known a device for increasing the frequency, which contains the main and output multiwinding transformers, the key elements to the additional load. Transformers key elements have a number of windings a multiple of the number of phases of the supply voltage. The key elements are made in the form of transistors, whose base circuits are connected in series with the secondary windings of the main transformer and the additional load, and the collector circuits are connected in series with the primary windings of the output transformer and an additional DC source. The transistors are unlocked at times when the voltages of the secondary windings of the main transformer become maximum and of the corresponding polarity, T.ie. once during the mains voltage period. At the same times, currents flow through the primary output of the output transformer. As a result of the addition of these currents, the secondary winding of the output transformer produces the voltage of the normal frequency of the SOC. This construction may be distributed in the case of a network with a mE function. A disadvantage of the prior art is relative difficulty. The purpose of the invention is to simplify the design. The goal is achieved by the fact that in a known device for increasing the frequency of a 3-phase voltage (containing an m-phase main transformer and a single-phase multi-winding transformer, whose specific winding is connected to the load, and its primary windings, are multiples of the number m, through key elements and through the secondary windings of the main m-phase transformer are connected with the additional load of direct current) as the key elements are installed, connected to the output circuit of the terminal, cat cerned iodyupochena wherein said load, and the primary windings of the single-phase output transformer connected between the secondary windings of the main transformer and the r-phase input terminals of said rectifier. FIG. 1 is a schematic diagram of a device for increasing the frequency by a factor of 3 :, FIG. 2 - time diagrams for his work. When constructing various rectifiers, from the point of view of obtaining a smooth form, straightened on the plate, the use of multiphase (i.e., based on CT-phase electric circuits) rectifiers is of interest. However, for such kind of rectifiers, the impulse load of each phase of the network is characteristic, i.e., the flow of impulsive, phase-shifted currents “by the moments of the time when the voltage of this phase is higher in magnitude relative to the voltages of the other phases . As the rectifier phase increases, the shape of the phase impulse currents will approach rectangular. If the pulses obtained as a result of the t-phase rectifier are isolated and summed up (for example, using a transformer) taking into account the time phase shifts, then there is a possibility of obtaining a single-phase alternating voltage of increased (by m) frequency mountable The device for increasing the frequency (Fig. 1) includes the main transformer 1, the wound windings 2, 3 and 4 of which are connected in series with the primary windings 5, 6 and 7 of the output transformer 8. The free ends of the windings 2, 3 and 4 are connected to the input terminals of the bridge 9 , made in this example on twelve vents (diodes) 10-21, connected in parallel in parallel (according to the rectifier scheme). A load 22 is connected to the secondary winding of the transformer 8, and an additional load 23 is connected to the output pins of the bridge 9. The voltage of the supply voltage is converted as follows. When turning on the windings of the main transformer 1 in the three-phase, AC network on the secondary windings 2, 3 and 4. Each phase is induced by sinusoidal voltages shifted between each other by 12 °. In the time intervals -t --tn (Fig. 2), the current in the circuit will flow through valve 13 an additional load 23, valve 16 and the primary winding 5 of the output transformer 8. All other valves are locked at this point in time, since the voltage of this phase more in magnitude than the voltage of other phases, respectively, currents do not flow through other windings either. At the moment tn, the instantaneous value of the voltage of the winding 4 of the main transformer 1 becomes greater than the voltage of the windings 2 and 3. Diodes 16 and 13 are locked and diodes 12 TL 21. Opp: the current flows through the winding 4 of the transformer 1. Analogue occurs and with winding 3, but already at time tj. Through the period of the mains supply, the processes in the windings are repeated. As a result of the operation of the proposed device on the secondary winding of the output trans | of Matora 8, a single-phase alternating voltage O c with a frequency of 150 Hz, which is nearly rectangular in shape, is the result of the sum of three out-of-phase pulsed currents flowing in its nei wine windings (ig 1 If there is a relatively powerful direct current load and it is required to build an alternating current source of increased frequency, which is the simplest, most effective and cheap 5shits proposed device, which will provide simultaneous power supply of two payloads, direct current and on alternating current of increased frequency. As examples of such dual use of the device, it is possible to carry out a circuit of a simultaneous feeding of an aluminum electrolysis circuit — a powerful load of direct current — 100 MW — and a power supply circuit of an electric tool, welding processes on an alternating current, and direct feeding of asynchronous motors the movement of the anode of the electrolyzer with the change of the speed of movement by changing the frequency, as well as other internal needs. Formula of the invention The device for increasing the frequency of the m-phase voltage, containing 9 06 m -phase main transformer and single-phase multiwinding output transformer, the secondary winding of which is connected to the load, and its primary windings, the number multiple of the number of Hz, through key elements and through BTTOhtnye windings of the main m-phase transformer are connected with an additional DC disconnect, characterized in that, with a simplification circuit, valves connected to the circuit are used as key elements , The output of which is connected vyvod1am wherein said neigruzka and primary windings of single-phase output transformer connected between the secondary windings of the main transformer and the m-phase input terminals of said rectifier. Sources of information accepted during the examination 1. Swiss Patent No. 479Ql8, cl. H 02 ch 5/22, 1974 .. 2. USSR author's certificate No. 565361, cl. H 02 M 5/27, 11974. 3. Report on research 58/61, № 71О6471, state. registry, inv. № B-174503, M., MEI, 1971, p. 14.

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Claims (3)

Form of invention A device for increasing the frequency of an m-phase voltage, comprising an m-phase main transformer and a single-phase multi-winding output transformer, the secondary winding of which is connected to the load, and its primary windings, multiples of the number of GLs, through key elements and through secondary windings The main pt-phase transformer is connected with an additional DC load, which is distinguished by the fact that, in order to simplify, valves connected to the circuit by rectifiers are used as key elements ator, to which output terminals of said load is connected, and wine per15 single phase winding of the output transformer secondary windings are connected between the m-phase main transformer and the input terminals of said rectifier. 20 Sources of information taken into account in the examination 1. Swiss patent No. 4799 ^ 8, cl. H 02 ™ 5/22, 1974. 2. USSR copyright certificate 25 No. 565361, cl. H 02 M 5/27, 1974. 3. Report on research 58/61, No. 7106471, state. registry, inv. No. B-174503, M., MPEI, 1971, p. 14. Figure 1