SU1115176A1 - Versions of a.c.voltage-to-a.c.voltage converter - Google Patents

Abstract

1. AC-to-AC converter, containing a power transformer, the primary winding of which is connected to the power circuit circuit, and the secondary winding has four taps, booster transformer, the primary winding of which has four taps, and the secondary winding is connected to the power circuit, and a group of controlled keys of alternating current, differing in the fact that, in order to regulate the quality, or the efficiency of the use of key elements and simplify it, m added additional booster transformers, the primary windings of which have four leads each and m additional groups of four controlled alternating current switches each, the power transformer has m additional secondary windings, each with four leads each, and the controlled alternating current switches each of the connecting groups between each other, the same leads of the primary winding of the corresponding booster transformer and the corresponding secondary winding of the power transformer, and the secondary windings and all (t + 1) -volt-added transformers are connected in series to the power circuit.

Description

2. AC-to-AC converter containing a power transformer, the primary winding of which is connected to the leads of the power circuit, a booster transformer, the primary winding of which has a tap, and the secondary winding is connected to the power circuit, and a group of four controlled keys AC, characterized in that, in order to improve the quality of regulation, the efficiency of the use of key elements, simplify and reduce weight and size indicators, increase manufacturability from preparing and improving reliability, it introduced m additional booster transformers, the primary windings of which have each a tapping chain and m

Additional groups of four controlled alternating keys each, the power transformer contains (t + 1) a group of secondary windings, each of which (t + 1) secondary winding groups is executed in the form of three isolated sections, one through the same variable keys current are connected to a common point connected via another controlled AC switch with one of the primary winding taps of the corresponding booster transformer, and the other terminals of the same name directly enno connected to respective terminals of the primary winding of the corresponding booster transformer.

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The invention relates to electrical engineering, in particular, to converter technology, and can be used to build converters, mainly voltage and current regulators, in power supply systems of electrical radio equipment.

Known devices containing a main transformer and several booster transformers}

However, in such devices, the quality of regulation is not high enough, which, in turn, determines the low reliability of the device (the probability of emergency or non-operating modes when a control system fails is high).

The closest to the proposed is an AC-to-AC converter that contains a power transformer, the primary winding of which is connected to the terminals of the LP circuit, and the secondary winding has a tap, a booster transformer, the primary winding has a tap of the tap, and the secondary winding is included in a power circuit with a group of four controlled alternating current keys ka 2.

However, in the known device, the quality of regulation is insufficient. From the point of view of combinatorics, the number of discrete output voltage levels in the presence of N keys in the circuit will be maximal if -j- (if N is even) can work simultaneously

(for N odd) any pecks whose. In practice, however, it is impossible to construct a scheme in which three or more of any keys can be simultaneously included. This suggests an insufficiently efficient use of key elements in the scheme with N:. 5 and, accordingly, S: 10 in the known device it is impossible to achieve linearity of regulation, i.e. provide, for example, with N 5, ten levels of output voltage

with equal spacing between them. When designing a device, this leads either to a narrowing of the output voltage regulation range with a constant adjustment level, or to

increase the step of control with a constant range. In any case, the capabilities of the device are used incompletely, and with increasing N (and, therefore, Sj), this disadvantage

all the more significant. Thus, 31 for example, with N 8 the theoretically possible number Sj 28, but in reality the calculation will provide not more than 18 levels of output voltage with an equal step between them, with the known device significantly increasing the voltages applied to the open keys. This makes the design of a particular device use high-class thyristors for voltage, which can be difficult and often impossible, as keys. The aim of the invention is to increase the efficiency of K-IW use of control elements, the quality of regulation and simplification. In the first embodiment, the goal is achieved in that an alternating voltage to alternating voltage converter contains a power transformer, the primary winding of which is connected to the leads of the power circuit, and the secondary winding has four leads, the additional transformer has four leads , and the secondary winding is included in the power circuits, and a group of four controlled AC switches, introduced additional m booster transformers, the primary windings of which have Four taps each and m are additional: groups of four controlled keys of alternating current each, the power transformer has m additional secondary windings, each has 4 taps each, and the controlled keys of alternating current of each group are connected to each other of the same name of the primary winding booster transformer and the corresponding secondary regulating winding of the power transformer, and the secondary windings of all (t + 1) s booster transformers are connected in series in power current pack According to the second variant, in order to reduce mass and size indicators, m additional booster transformers are added to the alternating voltage and alternating voltage converter, the primary windings of which have four taps and each additional control variable keys each. 764: the power transformer contains (t + 1) j group of secondary windings, and each of (t + 1) groups of secondary windings is made in the form of three isolated sections, one of which having the same name is connected to a common point through corresponding controlled AC keys, connected via another AC controlled key with one of the primary windings of the corresponding booster transformer, and the other section leads of the same name are directly connected to the corresponding primary winding terminals etstvuyuschego-booster transformer. According to the second variant, the common points of connection of the keys of each adjustment unit can be interconnected and with the instrument housing. So Thus, using symmetric thyristors as controllable keys for alternating current, you can install them on a common cooler and even just on the device case. This allows to significantly simplify the design and installation of the device, increases its operational reliability, and in many cases makes it possible to dispense with the use of a large number of radiators manufactured from. non-ferrous metals and alloys with high thermal conductivity. In this block diagram, it is the four-key adjustment nodes that are optimal. Building a device with similar control key points formally increases the number of voltage levels generated by the circuit, however, the control linearity is lost (which reduces the actual range or degrades the control accuracy) and increases the voltage on the open keys. However, if necessary, the last control unit may contain from three to five keys (and the corresponding number of taps of the primary winding of the booster transformer and the secondary adjustment winding of the main transformer). The total installed power of booster transformers, despite the increase in their number, in the proposed device does not exceed the installed power of one 51 transformer in a known device. FIG. 1-3 shows a functional diagram of the proposed device, options. The device (Fig. 1) contains a primary autotransformer 1 with partitioned secondary windings 2 and 3, a booster transformer 4 with a partitioned primary winding 5, a booster transformer 6 with a partitioned primary winding 7 and controlled keys 8-15 AC, with keys 8- 11 interconnect the like leads 16-19 of the windings 2 of the main autotransformer 1 and the windings 5 of booster transformer 4, and the keys 12-15 interconnect the like wires of 20-23 of the main windings 3 and winding 3 quipment 7 boost Transfrm Matora 6. The secondary windings 24 and 25 of booster transformers 4 and 6 are connected in series in the power current circuit between output terminal 26 and the output of the autotransformer zhimom device 27. FIG. 2 shows a device in which the main autotransformer has one partitioned secondary winding 2. The difference from the circuit of FIG. consists in the fact that in this scheme the keys of the same name in each group connect the same leads of the primary windings of booster transformers with the same tap of the adjusting winding of the main autotransformer. FIG. Figure 3 shows an example of the device circuit according to the second variant for the case when galvanic isolation of the input and output is required or matching of the input and output voltage levels is required. The device (Fig. 3) contains a power transformer 28 having a primary winding 29 connected to the input terminals of the device, a main secondary winding 30 and sections of two-groups of secondary windings 31-36, booster transformer 37 with partitioned primary winding 38, booster transformer 39 with secluded primary circuit, coil 40 and controlled keys 41-48 of alternating current, comprising two groups of 4 keys each. Taps 49-51 primary winding 38 voltodo. 6 of the base transformer are connected respectively to the ends of the three secondary adjustment windings 31-33 of the main power transformer 28, the other ends of which and the fourth tap 52 of the primary winding 38 of the booster transformer 37 are connected through one key41-44. Similarly, in the second control unit, the taps 53-55 of the primary winding 40 of booster transformer 39 are connected respectively to the ends of the three secondary adjusting windings 34-36 of the power transformer 28, the other ends of which and the fourth tap 56 of the primary winding 40 of the booster transformer 39 are connected to keys 45-48 in one point. The secondary winding 57 of booster transformer 37 and the secondary winding 58 of booster transformer 39 are connected in series to the output current circuit between terminal 59 of the main winding 30 of power transformer 28 and device output terminal 60. The principle of operation of all the circuits is the same: at the same time, in each group of four keys, any two keys are closed, creating a path for the current in the primary circuit of the corresponding booster transformer and inserting the corresponding emf in the secondary circuit of this booster transformer. By changing the values of these emfs, we can in the required way influence the equivalent transformation ratio of the executive structure, i.e. carry out the necessary conversion of the value of the AC voltage. Anti-parallel connected thyristors, triacs, transistors in the diagonal of diode bridges, and other power devices can be used as controlled alternating current switches. As in the known device, in the proposed scheme it is possible to carry out smooth voltage regulation due to phase or pulse width control between two adjacent levels. The number of operating states compared to a known device with an equal number of keys and, accordingly, a reduced number of idle and emergency modes indicate a higher reliability of the proposed device.

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Claims (2)

AC VOLTAGE CONVERTER TO VARIABLE (ITS OPTIONS). (57) 1. An AC to AC converter comprising a power transformer whose primary winding is connected to the terminals of the power current circuit, and the secondary winding has four taps, a boost transformer, whose primary winding has four taps, and the secondary winding is included in the power current circuit , and a group of four controlled keys of alternating current, characterized in that, in order to improve the quality of regulation, the efficiency of use of key elements and simplification, it is added m booster transformers, the primary windings of which have four taps each and w additional groups of four controlled alternating current keys each, the power transformer has m additional secondary windings having four taps each, and the controlled alternating current keys of each group are interconnected taps of the same name on the primary winding of the corresponding boost transformer and the corresponding secondary winding of the power transformer, and the secondary windings of all. (m + 1) x voltage-transformer ^; Mathors are connected in series in the power current circuit. o <0 2. An ac-to-ac converter containing a power transformer whose primary winding is connected to the terminals of the power current circuit, a boost-up transformer, the primary winding of which has four taps, and the secondary winding is included in the power current circuit, and a group of four controlled 'alternating current keys , characterized in that, in order to improve the quality of regulation, the effectiveness of the use of key elements, simplify and reduce overall dimensions, improve manufacturability To increase and increase reliability, it introduced w additional voltage-boosting transformers, the primary windings of which have four taps each and m additional groups of four controlled variable hock keys ι each, the power transformer contains> m (1 + 1) group of secondary windings in this case, each of the (m + 1) groups of secondary windings is made in the form of three isolated sections, one of the same terminals of which through the corresponding controlled alternating current keys are connected to a common point connected through another control yaemy AC key 'with the corresponding one of the laterals boost transformer primary winding, and other like outputs of sections directly connected to respective terminals of the corresponding boost transformer primary winding.