SU748779A1

SU748779A1 - Digital phase-shifting device

Info

Publication number: SU748779A1
Application number: SU772472921A
Authority: SU
Inventors: Владимир Юрьевич Баталин; Валерия Васильевна Кащеева; Александр Иванович Кузьменко; Анатолий Дмитриевич Семенов
Original assignee: Пензенский Политехнический Институт
Priority date: 1977-04-11
Filing date: 1977-04-11
Publication date: 1980-07-15

Description

1one

Изобретение относитс к электротехнике , в частотности к преобразовательной технике, и может быть использовано в системах цифрового управлени электроприводом.5The invention relates to electrical engineering, in particular to converter equipment, and can be used in digital drive control systems.

Известны схемы цифрового электропривода с частотными датчиками в цепи обратной св зи, в которых ynpaiBление электродвигателем осуществл етс в функции разности фаз частотных 10 сигналов с датчика обратной св зи и задающего генератора L1 .The schemes of a digital electric drive with frequency sensors in a feedback circuit are known, in which the ynpai electric motor is implemented as a function of the phase difference of the frequency 10 signals from the feedback sensor and the master oscillator L1.

Известно также цифровое устройство, которое вл етс наиболее близким те-; хническим решением к изобретению,со- 5 держащее генератор опорной частоты, ключ, счетчик импульсов, элемент И и регистр, в котором цифровой код преобразуетс в азу импульсов 2 .It is also known a digital device that is the closest one; With a practical solution to the invention, it contains a reference frequency generator, a key, a pulse counter, an AND element and a register in which the digital code is converted into a pulse of pulses 2.

При использований описанного уст- 20 ройства в системах астатического дискретного электропривода с частотным датчиком в цепи обратной св зи возникает , необходимость преобразовани сигнала разности фаз в цифровой код, 25 что усложн ет схему устройства,When using the described device in systems of an astatic discrete electric drive with a frequency sensor in a feedback circuit, it becomes necessary to convert the phase difference signal into a digital code 25, which complicates the device circuit,

; Цель изобретени - повышение надежности устройства.; The purpose of the invention is to increase the reliability of the device.

Поставленна цель достигаетс тем, что цифровое фазсЛдвигающее устрой- 30The goal is achieved by the fact that the digital phase shifter is 30

ство, содержащее генератор опорной частоты,соединенный с элементом И,и счетчик,дополнительно снабжено элементом НЕ,вторым элементом и элементом ИЛИ.Генератор опорной частоты выполнен с двум выходами,сигналы которых сдвинуты на 180° один относительно другого , причём выход элемента ИЛИ соединен с входом счетчика,а его входы - с выходами первого и второго элементов И,Вторые входы обоих элементов И соединены с первым и вторым выходами генератора опорной частоты соответственно .. Первый вход второго элемента И вл етс входом уменьшени фазового сг.вига, а первЕлй вход первого элемента Иподключен к выходу элемента НЕ, вход которого вл етс входом увеличени фазового сдвига.A device containing a reference frequency generator, connected to an AND element, and a counter, is additionally equipped with an NOT element, a second element and an OR element. The reference frequency generator is made with two outputs, the signals of which are shifted by 180 ° one relative to the other, the input of the counter, and its inputs with the outputs of the first and second elements AND, The second inputs of both elements AND are connected to the first and second outputs of the reference frequency generator, respectively. The first input of the second element I is the input of the f reduction gas core, and the first input of the first element is connected to the output of the element NO, whose input is an input for increasing the phase shift.

На фиг.1.приведена функциональна схема устЕЗойства; на фиг.2 - временные диаграмма, по сн ющие его работу.In Fig. 1, a functional diagram of the EQUIPMENT is presented; 2 is a timing diagram explaining his work.

Цифровое фазосдвигайщее устройство содержит элемент НЕ 1, генератор 2 опорной частоты элементы И 3,4, элемент ИЛИ 5, счетчик 6 импульсов.The digital phase-shifting device contains the element NOT 1, the oscillator 2 of the reference frequency elements AND 3.4, the element OR 5, the counter 6 pulses.

Claims

The output pulses 7.8 of the generator 2 are shifted relative to each other by 1800. Signal 9 at the first input of the element I 3 corresponds to a decrease in faitjBbro shift, and signal 10 at the input of the element NOT to an increase in the phase shift. The output of the counter b comes pulses, 12 ms, vary with respect to the phase of pulses 13 synchronized with the network. The device can operate in three modes. 1. The phase shift of the output signals with respect to the network phase remains unchanged. 2. The phase shift of the output signals is reduced. 3. The phase shift of the output signals increases. In the first mode, the signals 9 and 10 at both inputs of the device are equal to 0. The signal at the first input of the element And 4 is l, Therefore, at the input of the counter, the elements 4 and 4 and 5 receive pulses 8 only from the second output of the generator 2 (FIG .2, a). The pulses 7 are not passed from the first output of the generator 2 to the counter input. The frequency of the pulses 7 and 8 and the coefficient of recalculation of the counter 6 are chosen such that the pulses 12 at the output of the counter follow with a frequency equal to the network frequency. Therefore, the phase of the pulses 12 relative to the phase of the network remains unchanged. In the second mode, signal 9 decreases the phase shift equal to l, and signal 10 equals as a result, pulses 7 and 8 from both outputs of generator 2 pass through the element OR 5 and arrive at the input of the counter. Pulse frequency 11 at the input of the Uwelychva | yts counter twice, which leads to an earlier occurrence of pulses 12 at the output of the counter and, therefore, reduces the phase of the output pulses (Fig: 2, b). In the third mode, signal 9 is equal to o, and signal 10 is equal to 1. In this case, the pulses 7 and 8 do not pass to the input of the counter 6, since at the first inputs of the elements 3 and 4, the signals are equal O, which leads to a later appearance of the pulses 12 at the output of the counter and, consequently, an increase in the phase of the output pulses (figure 2, c). The proposed device, in which the AND, NOT and OR elements are used, favorably differs from the prototype by the simplicity of the circuit implementation. DETAILED DESCRIPTION OF THE INVENTION A digital phase-shifting device comprising a reference frequency generator connected to an AND element, and a counter, characterized in that, in order to increase reliability, it is additionally equipped with an NOT element, a second Andzement element and an OR element, a frequency generator. two outputs whose signals are shifted on IbO relative to each other, with the output of the OR element connected to the counter input, and its inputs to the outputs of the first and second And elements, the second inputs of both And elements connected to the first and second outputs rows of the reference oscillator, respectively, a first input of the second AND gate is input to the phase shift reduction but pervoto first input of AND gate connected to the output element of willows, the input of which is input to increase the phase shift. Sources of information taken into account at. examination 1. The author's certificate of the USSR № 4229492, cl. H 02 R 5/06,

2. Chitenko I.M., Rudenko B.C.,. Senko V.I. Fundamentals of converting technology. M., Higher iuKana, 1974, p. 323 (prototype).