SU708483A1

SU708483A1 - Inverter control device

Info

Publication number: SU708483A1
Application number: SU772495582A
Authority: SU
Inventors: Виктор Эмильевич Дель; Фархад Шарипович Абсалямов; Юрий Васильевич Воробьев
Original assignee: Уфимский авиационный институт им. Орджоникидзе
Priority date: 1977-06-13
Filing date: 1977-06-13
Publication date: 1980-01-05

Description

II

Изобретение относитс к электротехнике и может быть использовано в системах управлени тиристорных инверторов.The invention relates to electrical engineering and can be used in thyristor inverter control systems.

Известны устройсгеа дл управлени инвертором , содержаидае задающий генератор, формирователь одиночных пусковых импульсов и схемы задержки 1-2.Known devices for controlling an inverter include a master oscillator, a single starting pulse driver and delay circuits 1-2.

Недостатками известных устройств вл ютс сложность и низка помехозащищенность из-за наличи устройства задержки.The disadvantages of the known devices are the complexity and low immunity due to the presence of a delay device.

Известно также устройство дл управлени инвертором, которое состоит из задающего генератора, содержащего врем задающую последовательную RC-цепь из резистора и конденсатора и выходной трансформатор , формировател единичных пусковых импульсов, устройства задержки, обеспечивающего увеличенный интервал времени между одиночным импульсом и следующей за ним серией импульсов 3.It is also known a device for controlling an inverter, which consists of a master oscillator containing the time specifying an RC circuit from a resistor and a capacitor and an output transformer, a single start pulse generator, a delay device providing an increased time interval between a single pulse and the next pulse train 3 .

Недостатком известного устройства вл етс сложность схемы из-за наличи устройства задержки, следствием чего вл етс низка надежность системы пуска.A disadvantage of the known device is the complexity of the circuit due to the presence of a delay device, resulting in low reliability of the start-up system.

Целью изобретени вл ютс упрощение схемы и повьшхенне надежности пуска.The aim of the invention is to simplify the circuit and increase the reliability of the start.

Поставленна цель достигаетс тем, что в устройстве дл управлени инвертором импульсный трансформатор снабжен дополнительной обмоткой, а блок задержки. выполнен на дополнительном и ограничительном резисторах, диоде и тиристоре, причем дополнительный резистор, зашунтированный последовательно соединенными тиристором и диодом , включен между формирователем одиночных импульсов и вторым выводом резистора врем задающей RC-цепочки, ограничительный резистор включен между точкой соединени тиристора и диода и вторым выводом конденсатора врем задающеб RC-цепочки, а управл ющий переход тиристора подключен к дополнительной обмотке импульсного трансформатора .This goal is achieved by the fact that in the device for controlling the inverter the pulse transformer is provided with an additional winding, and the delay unit. made on additional and limiting resistors, a diode and a thyristor, with an additional resistor shunted by series-connected thyristor and a diode connected between the single pulse shaper and the second output of the resistor; the time of the driving RC circuit, and the thyristor control transition is connected to the auxiliary winding of the pulse transformer.

Claims

FIG. 1 is a schematic diagram of an apparatus for controlling an inverter; FIG. 2 - time diagram, explaining the principle of operation. .3 The device contains a relaxation generator on a unijunction transistor 1, a resistor 2, a time setting RC chain consisting of an -resistor: 3 and a capacitor 4. The common point of resistor 3 and capacitor 4 is connected to the emitter of the unijunction transistor 1. The first base of the unijunction transistor 1 is connected to the minus of the power source through the primary winding of the output pulse transformer 5. The second base of the single junction transistor 1 is connected to a resistor 6, the other end of which is connected to the positive power source through the thyristor 7 Former single impulses. Parallel to the thyristor 7, a series circuit is connected, consisting of the primary winding of the pulse transformer 8 and capacitor 9. The resistor 2 is bridged by a series circuit consisting of the thyristor 10 and diode 11. The common point of the thyristor 10 and diode 11 is connected to the minus of the power source through the resistor 12. The device works as follows. After turning on the power, the capacitor 9 is charged to the voltage of the power source. When a starting pulse arrives at the control electrode of the thyristor 7, it opens and the capacitor 9 is discharged through the primary winding of the pulse transformer 8, and single pulses will be generated, which are fed to the corresponding inverter thyristors to pre-charge the switching capacitor. After the thyristor 7 is opened, the capacitor 4 begins to charge through resistors 2 and 3 of the time of the master circuit. The charge time of the capacitor 4 to the value of the turn-on voltage of the single junction transistor, determined by the value of the total resistance of the resistors 2 and 3, is the delay time of the main series of pulses. As soon as capacitor 4 is charged to a voltage equal to the turn-on voltage of the unijunction transistor 1, transistor 1 turns on and capacitor 4 discharges through the primary winding of the pulse transformer 5. A pulse is generated in the secondary winding of the pulse transformer 5 to the control electrode of the thyristor 10 , the thyristor 10 opens and shunts the resistor 2. The resistor 12 serves to hold the thyristor 10 in the open state. Diode 11 is required to prevent capacitor 4 from discharging through resistors 3 and 12. Since resistor 2 is ground by thyristor 10 and diode 11, the charging time of capacitor 4 to a voltage equal to the turn-on voltage of the unijunction transistor 1 will be determined only by the value of the resistor 3, which is selected based on the required frequency of the master oscillator. The positive technical effect of using this device is that the increase in the time interval between the first starting pulse occurs directly in the circuit of the additional delay devices, the number of elements of the starting device is significantly reduced and, as a result, the reliability of the starting device is increased. Invention A device for controlling an inverter, comprising a single pulse shaper, a relaxation generator on a single junction transistor, the input of which is connected to the connection point of the capacitor and resistor, the time of the driving RC circuit, and the output to the primary winding of the pulse transformer, and a delay unit, characterized in that , in order to increase reliability ... of the start-up, the pulse transformer is provided with an additional winding, and the delay unit is made of two resistors, a diode and a thyristor, and one of the resistors is protected The thyristor and diode are serially connected in series and connected between the single pulse driver and the second output of the resistor of the RC master circuit, another resistor is connected between the connection point of the thyristor and the diode and the second capacitor terminal of the RC master circuit, and the control transition of the thyristor is connected to the auxiliary winding pulse transformer. Sources of information taken into account during the examination 1. USSR author's certificate No. 369663, cl. H 02 M 7/52, 1969.

2. USSR author's certificate number 383195, cl. H 02 R 13/18, 1970.

3. Katzelson S.M. et al. Trigger system of adjustable inverter with inductive input without filter capacity. Works AIM vol. 64, Ufa. 1974, p.137.

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