SU888333A1

SU888333A1 - Method of shaping control signal of controllable inverter switches

Info

Publication number: SU888333A1
Application number: SU792705626A
Authority: SU
Inventors: Анатолий Евгеньевич Сурминский
Original assignee: Предприятие П/Я М-5374
Priority date: 1979-01-03
Filing date: 1979-01-03
Publication date: 1981-12-07

Description

1one

Изобретение относитс к силовой преобразовательной технике и может найти применение в регулируемых инверторах, в диагональ переменного тока которых включена первична обмотка силового трансформатора, отвод от середины которой через дроссель соединен с одним из выводов дл подключени источника питани .The invention relates to power converter technology and can be used in adjustable inverters, in the AC diagonal of which the primary winding of a power transformer is included, the outlet from the middle of which is connected via a choke to one of the terminals for connecting the power supply.

Известен способ управлени инвертором , состо щий в том, что подают напр жение пр моугольной формы в цепи управлени ключами, соединенных с разными концами диагонали переменного тока больше полупериода длительности выходного напр жени Г1.A known method of controlling an inverter is to supply a square wave voltage to a key control circuit connected to different ends of the alternating current diagonal more than a half-period of the output voltage duration G1.

Недостатком данного способа вл етс то, что при регулировании величины выходного напр жени в нем имеетс пауза переменной длительности, ухудшающа форму выходного напр жени .The disadvantage of this method is that when adjusting the magnitude of the output voltage in it there is a pause of variable duration, which worsens the shape of the output voltage.

Наиболее близким по техническим средствам и достигаемому результату The closest in technical means and the achieved result

вл етс способ формировани сигнала управлени ключами регулируемого инвертора, в диагональ переменного тока которого включена первична обмотка силового трансформатора, отвод от середины которой через дроссель соединен с одним из-выводов подключени источника питани , состо щий в том, что подают пр моугольное напр жение в цепь управлени ключом, is a method of generating a key control signal for an adjustable inverter, the diagonal of which is connected to the primary winding of a power transformer, the lead from the middle of which is connected to one of the power supply wiring terminals from a choke to supply a rectangular voltage key management

10 соединенным с одним концом диагонали переменного тока, подаютпр моугольное напр жение такой же формы и частоты в цепь управлени ключом, соединенным с другим концом диагонали ременного тока 2.10 connected to one end of the diagonal of an alternating current, supplying a rectangular voltage of the same shape and frequency to the control circuit of a key connected to the other end of the diagonal of the belt current 2.

Недостатком известного способа вл етс мен юща с длительность паузы в выходном напр жении при регулирова20 нии, что ухудшает его форму,.The disadvantage of the known method is the varying duration of the pause in the output voltage during adjustment, which worsens its shape ,.

Claims

The aim of the invention is to improve the shape of the voltage curve of the inverter. 3 The goal is achieved by the way in which the key control signal of an adjustable inverter is formed, two specified square voltages are alternately supplied to the control circuit with the same key, replacing one voltage with another with a double frequency and variable phase shift between these voltages mi Fig. 1 is a schematic diagram of the inverter; Fig. 2 shows timing diagrams. In the figures, the following designations are given: 1–4 transistors, on which power switches are filled, are return diodes, 9 the power transformer whose primary winding is connected to the 8th diagonal of the alternating current of the inverter, and the drain from the middle of this winding through the choke 10 is connected to connection of the power source j 11 - inverter load) 12 a capacitor included in a diagonal of an inverter direct current J - inverter key control circuits, 17–18 dz rectangular voltages shifted relative to each other by an amount - and alternately under Vai in col pi control keys 19 when replacement of one voltage | other, which is shifted by an amount relative to the voltage 1 7 and an amount) relative to the voltage relative to 18; 20--23 control signal received by this method, L-27 state of keys; 28 is the output voltage of the inverter. From the diagrams of open and closed states of the keys, it is seenj that the same signs of voltages 17 and 18 correspond to the pulse of the output voltage of the inverter, and to different signs a pause of this voltage. The transition of diagram 19 from one half-cycle to another and synchronous switching of the keys occurs during the pause of the output voltage and divide this pause into two parts, f and 2pQ. During one part -f, keys 2 and 3 are simultaneously open and the direction on the 1 O throttle has a value and a negative sign, and during the other part of this pause fn, the keys 1 and the pressure on the throttle 10 are positive and equal to V, where Vf, is the voltage across the capacitor 12, and V is the supply voltage of the inverter. When changing the moment of replacing the voltages 1 7 and 18 in the key management circuits, the time of their synchronous switching also changes, and with it the volt-second integral of the voltages nc pn of the winding of the chokes, due to which the voltage is regulated. on the capacitor 12, as well as the output voltage of the inverter with a constant value v of the pause of this voltage. With the proper choice of the -z value, the output voltage of the inverter can be improved. For example, with - -: a third and multiple harmonic components are excluded from the spectrum of the output voltage of the inverter, and the control range is two. The use of this invention improves the quality of the output voltage of the inverter. The invention The method of generating the key control signal of an adjustable inverter, the diagonal of the alternating current of which is connected to the primary winding of the power transformer, diverting from the center through a choke with one of the terminals for connecting the power source, consisting of supplying a rectangular voltage to a key-driving circuit connected to one end of an ac diagonal, supplying a rectangular-type voltage The same shape and frequency are connected to a control circuit with a key connected to the other end of the AC diagonal, characterized in that, in order to improve the shape of the output voltage curve, two specified square voltages are fed into the control circuit with the same key, moreover, they replace one voltage with another with a double frequency and an adjustable phase shift between these voltages. Sources of information taken into account during the examination 1. Moin V.So and others. Stabilized transistor converters, M., Energiya 1972, p. 359, FIG. 9210. 2, USSR Copyright Certificate No. 1859 09/07, cl. H 02 R 13/18, 18.12.73.