SU1397945A1 - Multiphase function converter - Google Patents

Abstract

The invention relates to the formation (synthesis) of electrical signals described by a trigonometric, for example, sinusoidal, multi-step function for the synthesis of discretely adjustable constant and alternating voltages, and can be used in automation, computing and converter technology. The chain of the invention is to improve the accuracy of the synthesis of the output voltage. The functional converter contains converter 1 of direct voltage to alternating, primary winding 2 of transformer 3, several secondary windings 4, -4p, power switches 5d, 5, 5 If ... ,, 6 ,. .., 7, 7, and the secondary windings and keys form the corresponding phases of the converter, the load 8, the rectifier winding, an additional DC source, the transformer, the DC keys and the synchronization unit 14. The transducer uses an intermediate high-frequency signal transform based on an algorithm based on a multi-valued number system. The sequential inclusion of bit transformer-key structures allows, in comparison with the prototype, to increase the digital capacitance of the converter and thereby increase the accuracy of the synthesis of the shape and voltage of the output signal. 3 pe. (L

Description

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The invention relates to the formation (synthesis) of electrical signals described by a trigonometric, for example, sinusoidal multistage function, to the synthesis of discretely adjustable constant and alternating voltages, and can be used in automation and computational h converter technology.

The purpose of the invention is to improve the accuracy of the synthesis of the output voltage form.

FIG. 1 shows a multi-phase functional converter circuit; in fig. 2 and 3 - its variants

connection to the load.

The multiphase functional converter (Fig. 1) contains a constant-voltage-to-alternating converter 1, made according to a bridge or push-pull circuit, operating at a high intermediate frequency, the primary winding 2 of transformer 3, n the secondary windings 4 connected to

ten

15

20

25

The keys 5, .., 6 (Fig. 2), at which a push-pull signal is released on the secondary windings 4, can be synthesized on the load 8 with a constant voltage of adjustable amplitude, which is determined by choosing the number of the same name x symmetrically located relative to the central keys in each category de. The number of synthesized levels is determined by the digital capacitance S of the converter:

  .

where 1 - the maximum number of the alphabet - the number of taps in the half-winding without the central; Р - base of the selected numbering system - total number of taps in category 4,; n is the number of bits. Digital capacity can be increased

if we use an additional voltage source, from which the synthesized voltage, b), 7) is subtracted into the groups of power switches 5j, 5 5, ..., le, and then the secondary community is added to it. With

,, 1 and secondary

the coils and keys form the corresponding phases of the converter (ia (| ig. I is the first phase). In addition, the converter contains the load 8, the winding 9 of the rectifier, the rectifier 10 (Fig. 2), an additional source

thirty

Here, the new digital capacitance S is defined by the expression S, 2S + 1.

Due to the alternate operation of symmetric keys, it eliminates with a constant-magnetisation of the transformer power supply source 3

And constant voltage, transfer-35 (Fig. 2). Thus, the transmitter 12, the direct current switches 13 (FIG. 3) and the synchronization unit 14 (FIG. 1) are provided.

The Converter (Fig. 1) works as follows .40

The synchronization unit 14 provides the switching sequence of the keys 5 Q, ..., 7 in accordance with the required shape of the converted signal. Due to the serial connection of 45 transformer-key structures, the numbering system used in the forka synthesis and, consequently, the digital capacitance is improved. For example, using 12 keys with 12 taps and a four-bit three-way system in the considered converter, a digital capacitance of 4I is obtained. Thus, the accuracy of 55 loads is provided through the Zo-b keys of synthesis proceeds in combination with the simplicity of the design of the converter as a whole.

If in one of the converter phases to provide such an algorithm, re-improving the accuracy of synthesis of the DC voltage value practically without complicating the device, as either a DC voltage source can be used, the PI converter as a whole, or additionally organized winding 9 and straightener 10.

The voltage of an additional source, E, is always selected by one adjustable quantum, e, greater than the maximum voltage level synthesized in the converter phase:

E (S + l) e,

%

where e - quantum voltage, weight

voltage. This leads to the fact that the current is always in one direction, which allows them to be executed in the form of unipolar keys and to save the number of active elements in half.

0

five

0

five

The keys 5, .., 6 (Fig. 2), at which a push-pull signal is released on the secondary windings 4, can be synthesized on the load 8 with a constant voltage of adjustable amplitude, which is determined by choosing the number of the same name x symmetrically located relative to the central keys in each category de. The number of synthesized levels is determined by the digital capacitance S of the converter:

  .

where 1 - the maximum number of the alphabet - the number of taps in the half-winding without the central; Р - base of the selected numbering system - total number of taps in category 4,; n is the number of bits. Digital capacity can be increased

if you use an additional voltage source from which you first

Here, the new digital capacitance S is defined by the expression S, 2S + 1.

Due to the alternate operation of symmetric keys, it eliminates with a constant-magnetisation of the transformer power supply source 3

(Fig. 2). Thus, provides

loads through the keys So-b flows

with an increase in the accuracy of the synthesis of a DC voltage with virtually no complication of the device, as it can be used, either a DC voltage source is available, a b-converter as a whole, or additionally organized - a winding 9 and a rectifier 10.

The voltage of an additional source, E, is always selected by one adjustable quantum, e, greater than the maximum voltage level synthesized in the converter phase:

E (S + l) e,

%

where e - quantum voltage, weight

voltage. This leads to the fact that the load current through the So-w keys flows

always in one direction, which allows them to be made in the form of unipolar keys and to save twice the number of active elements.

If one of the phases of the converter made according to the scheme of FIG. 2, to load a push-pull amplifier (Fig. 3), it is possible to provide discrete regulation of the variable signal at the amplifier output, or use this device as a new functional converter, which has more than doubled its digital capacitance. Here, winding 9, rectifier 10 are replaced by a source E.

If the output windings of the devices according to the scheme of FIG. 3 of each phase is connected in series with each other and the load, then a new functional converter is formed, at which the digital capacity is sharply increased.

e, j.

The synthesis of such a functional. The converter is based on the use of a combined multi-valued number system. P - the number base in each phase is selected, then the base number for the converter as a whole is determined by the following jpiM way:

P 2 () + 3.

00

The advantage of this functional converter is the lack of AC switches.

accuracy of the synthesis of the form and the am-variable signal.

Claims (1)

Invention Formula A multiphase functional converter containing a constant voltage converter into a variable converter, three outputs of which are connected respectively to the middle and two extreme terminals of the transformer primary winding, power switch groups by the number of transformer secondary windings in each phase the group of power keys are combined, and other informational conclusions of the power keys of the group are connected respectively to the middle, intermediate and extreme conclusions of the corresponding second transformer and the synchronization unit, the outputs of which are connected to the control and the inputs of the corresponding power switches of the groups, it is known that, in order to increase the accuracy of the synthesis of the output voltage form, transformer in each phase is connected to the combined information outputs of the power switches of the subsequent 145UPPs, and the combined information outputs of the power switches of the first group and the average output of the last secondary winding of the transformer in each The phase is the external pins of the corresponding phase of the converter. Ujlj GGGPS L --- Mouth pf 1. G AJ 4 - “/, Le, g 2lxx / VTV Sn / 1 1 (J). /   II 11 II Uj / 2 Fi9.3