SU1327254A1 - Converter with output quasisine voltage - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power supply and electric drive systems to convert a constant voltage to an alternating quasi-sinusoidal. The goal is to expand the functionality of the operation to ensure the work on the load with any coefficient. power. The inverter cell inverter cells 10-13 with output transformers 14.1-14.4, secondary 15.1-15.4 and auxiliary 16.1-16.4 windings of which are connected in series between cells. The first two cells 10 and 11 are made on power transistors 18.1, 18.2, 19.1, 19.2 and return diodes, the second ones are on alternating current keys. The amplitude of each rectangular voltage, starting from the third, is modulated in the CJTM function of all previous voltages. The properties of bidirectional current conduction in the open state of alternating current switches and power transistors shunted by return diodes ensure normal operation of the converter without distorting the shape of the output voltage to the load with any coefficient. power. 2 Il. I (L with you vj to eat fie2

Description

The invention relates to electrical engineering and can be used in secondary power supply and electric drive systems to convert a constant voltage to an alternating quasi-sinusoidal.

The purpose of the image: shadows - extending functionality by providing work on the load with any power factor.

FIG. 1 shows voltage diagrams; in fig. 2 is a circuit diagram of a converter with a quasi-sinus-output voltage on four inverter cells.

FIG. 1 shows the output voltages 1 and 2 of the two first inverter cells, the control pulses 3, the supply voltage 4 and the output voltage 5 of the third cell, the supply voltage 6. , control pulses 7 and output: voltage 8 of the fourth cell. A quasi-sinusoidal step voltage 9 is obtained at the output terminals.

The Converter (figure 2) consists of four inverter cells 10-13 with output transformers 14.1-14.4, the secondary 15.1-15.4 and auxiliary 16.1-16.4 windings of which are connected between the cells in series. The secondary windings 15.1-15.4 are connected to the load 17. The first two cells 10 and 11 are made on the power transistors 18.1, 8.2,

19.1,19.2 and return diodes 20.1,

20.2,21.1, 21.2, and neyki I2 and 13 are made on alternating current keys 22.1, -. 22.2, 23.1, 23.2. The first supply terminals 24.1, 24.2 of the cells 12 and 13 are combined and connected to the free, output of the auxiliary winding 16.1 of the transformer 14 "1 of the first cell 10, and the second supply terminals of 25.1, 25.2 - 16.3 and 16" 2 of the auxiliary windings of the transformers

14.3 and 14.2.

The converter works as follows.

The essence of obtaining quasi-sinusoidal step voltage is based on the fact that the amplitude is each. rectangular voltage, starting from the third, is modulated as a function of the sum; all previous stresses.

To do this, two voltages 1 and 2 are first formed, for example, with the help of inverter cells. From ... April 1 and 2, voltage 4 is formed by algebraic summation of voltages. Next, voltage 4 is obtained by voltage 5 by supplying it, for example, as the supply voltage of an inverter cell, controlled according to diagram 3.

The summation of voltages 1.2 and 5 yields a voltage of 6, which is subsequently converted to a voltage of 8. This conversion is usually implemented on the basis of an inverter cell, made on alternating current keys controlled according to diagram 7. The summation of voltages 1,2, 5 and B gives the output voltage 9. Inverter cell 10 receives the input

the voltage of the converter, and control pulses of type 1 arrive at the control circuits of transistors 18.1,18.2. Voltage 1 is formed on the secondary windings of transformer 14.1.

Reverse diodes 20.1 and 20.2 provide two-way exchange of energy between the primary power source and the load. On the control circuit of transistors 19.1, 19.2 enters

antiphase voltage type 2 and the secondary windings of the transformer, 14.2 voltage is formed 2. The summation of voltages 1 and 2 of the secondary windings b.1 and 16.2 gives a voltage

4, which is the supply voltage of the inverter cell 12, made on the alternating current keys 22. I., 22.2. The AC switch is, for example, a rectifying bridge, in the diagonal of which a transistor is connected. The control of the alternating current keys 22.1, 22.2 is carried out by the voltage 3, as a result of which on the secondary windings 15.3,

16.3 of the matching transformer, voltage 5 is formed. The summation of voltages 1.2 and 5, respectively, of the secondary windings 16.1-16.3 gives a voltage of 6, which is the supply voltage of the next inverter cell 13, made on AC switches 23.1, 23.2, on. the control circuits of which receive a voltage of type 7. On the secondary windings

Transformer 14.4. Voltages 8 are generated. The summation of voltages 1, 2, 5 and 8 of the secondary windings 15.1-15.4 yields a voltage 9 at the output terminals (at load 17).

31

Properties. Bidirectional current conduction in the open state of alternating current switches and transistors shunted by return diodes ensures normal operation of the converter without distorting the shape of the output voltage to the load with any power factor.

Claims (1)

Shadow Shape formula A converter with an output voltage of quasi-sinusoidal voltage, containing N inverter cells with output transformers, each of which has primary and secondary windings, the output transformers of all cells, except the last, are equipped with an auxiliary winding, while the secondary windings of transformers of all cells are interconnected in series and connected to the output pins of the converter, pomogoda272544 The individual windings of the output transformers are also interconnected in series, and the control circuits of the inverter cells are connected to the corresponding outputs of the control unit, characterized in that, in order to extend the functionality by providing Q works on the load with any power factor, the first two inverter cells are made on transistors shunted by return diodes, and all other inverter cells 15 cells are made on the alternating current keys and are connected respectively to the first power output to the free output of the auxiliary winding of the output transformer of the first cell 2Q and the second supply terminal to the connection point of the auxiliary windings of the output transformers of this and previous cells. Jir-lfuij jinr. sshiishplll-pppgts Put. { Compiled by V. Moin. Editor N. Khrupkina Tehred L. Oliynyk Order 3 06/53 Circulation 659Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader. Cherni