SU860231A1

SU860231A1 - Device for controlling power transistor

Info

Publication number: SU860231A1
Application number: SU802870705A
Authority: SU
Inventors: Владимир Павлович Смирнов; Виктор Яковлевич Заверюха; Лола Фарруховна Исмаили
Original assignee: Предприятие П/Я А-1380; Ташкентский Политехнический Институт
Priority date: 1980-01-10
Filing date: 1980-01-10
Publication date: 1981-08-30

Description

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Изобретение относитс к.электротехнике и может быть использовано дпк управлени транзисторными ключами автономных инверторов и регул торов посто нного напр жени .The invention relates to electrical engineering and can be used to control the transistor keys of autonomous inverters and regulators of constant voltage.

Известно устройство дл управлени силовым полупроводниковым ключом, содержащее источник питани , источник смещени , ключевой элемент, источник управл ш1их строб-импульсов, причем ключевой элемент св зан с управл ющим электродом силового ключа дополнительный ключевой элемент, выполненный на двух транзисторах разного типа пройоднмости, базы которых подключены к силовому электроду ключёвогр элемента, эмиттеры - к управ-г л ющему электроду силового ключа,коллектс (р одного св зан с полюсом источника титани , а коллектор другого с полюсом источника смещени Щ .A device for controlling a power semiconductor key is known, comprising a power source, a bias source, a key element, a source of control strobe pulses, the key element being connected to the control electrode of the power key, an additional key element made on two transistors of different types of power, whose bases connected to the power electrode of the key element, the emitters to the control electrode of the power switch, the collector (one of which is connected to the source pole of the titanium, and the collector of the other with yusom u bias source.

Недостатком этого устройства вл етс рассеивание энергии на резисторе , соедин ющем базы дополнительных ключей с источником смещени , что приводит к снижению КПД.A disadvantage of this device is the dissipation of energy at the resistor connecting the bases of the additional switches to the bias source, which leads to a decrease in efficiency.

Наиболее Слиэким по технической сущности и достигаемому результату к предлагаемому вл етс устройство дл управлени силовым транзистором.The most slimy in technical essence and the achieved result to the proposed is a device for controlling the power transistor.

содержащее два транзистора, эмиттеры которых через резисторы подключены к источнику питани , а коллекторы к базам двух вспомогательных транзисторов , коллекторы каждых через резисторы подключены к источнику питани , а эмиттеры подключены к генератору импульсов запуска, подсоединенному к диоду, электроды которогоподклю10 чены к зажимам, предназначенным дл подключени к управл ющей цепи силового транзистора 23.containing two transistors, the emitters of which are connected to a power source through resistors, and the collectors to the bases of two auxiliary transistors, the collectors each are connected to a power source through resistors, and the emitters are connected to a trigger pulse generator connected to a diode, whose electrodes are connected to terminals designed for connections to the control circuit of the power transistor 23.

Недостатком этого устройства вл етс ниэкий КПД.The disadvantage of this device is poor efficiency.

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Цель изобретени - повышение КПД устройства.The purpose of the invention is to increase the efficiency of the device.

Указанна цель достигаетс тем, что устройство снабжено аналоговым This goal is achieved in that the device is equipped with an analog

Claims

20 element made on additional resistor, diode and transistor, the emitter of which is connected to the base of the first transistor,; The collector is connected to the power source, the base is connected via an additional diode to the collector of the power transistor, and an additional resistor is connected between the base and the collector of the additional transistor. The drawing shows a diagram of the device. The device contains a power supply 1, a power transistor 2, the control input of which is shunted by a diode 3, transistors 4 and 5, resistors 6 and 7, auxiliary transistors 8 and 9, resistors 10..and 11, an additional analog element made on additional resistors 12, the diode 13 and the transistor 14, the emitter of which is connected to the collector of the auxiliary transistor 8, the collector and the additional resistor are connected to the outermost terminal of the power supply 1, and its base is connected to the other side of the additional resistor 12 and body) 13 with the collector of the power transistor and the generator 15 pulse start. The device works as follows. Transistors 4 and 8, resistors B and 10, connected as shown in the drawing, form a bistable switch circuit in the positive control current circuit, which can either be in the on state (the transistors are in the on-line mode) or off. nii (transistors are in cut-off mode). The key in the negative control circuit is similar. It is assumed that all keys are locked. When a negative pulse is applied from the start pulse generator 15, the auxiliary transistor 9 opens and opens a transistor 5 along the positive feedback circuit, and the saturation process of the transistors is regenerative. After the start-up pulse has expired, transistors 9 and 5 remain on, and transistors 4 and 8 are turned off, power transistor 2, additional diode 13, and additional transistor 14 are locked. When a positive start pulse is applied from the generator 15, transistors 9 and 5 are closed. And transistors 8 and 4 are turned on, the power transistor 2 opens, and an analog element comes into operation, the function of which is to correct the positive current of the power switch depending on the current. load power transistor. The base-collector voltage of the power transistor (IBC) is kept constant. At any moment in time, the ratio% e, CA “- and EV- 5 1 is valid where 5e-g4 is the voltage of the oas-emitter of transistor 14; , - voltage drop across diode 13; . 0.3 - collector-emitter voltage across the nasled transistor 8. As the load current increases, the voltage Ug decreases, and since the voltage values and 8 are almost constant, the voltage U increases and leads to a decrease in the resistance of the transistor 14 and, as Consequently, an increase in the control current of the power transistor and an increase in the voltage Usji-When the control current of the power transistor decreases, the reverse occurs. Thus, the introduction of an analog element allows the correction of the control current of the power switch 2, depending on the magnitude of the load current of the power switch, which leads to a significant increase in the efficiency of the device. Claims An apparatus for controlling a power transistor comprising two transistors, the emitters of which are connected to a power source through resistors, and the collectors to bases of two Bcnoiviral transistors whose collectors are connected to a power source through resistors, and the emitters are connected to a trigger pulse generator connected to the diode, the electrodes of which are connected to the terminals intended to be connected to the control circuit of the power transistor, characterized in that, in order to increase efficiency, it is provided an analog element made on an additional resistor, a diode and a transistor, the emitter of which is connected to the base of the first transistor, the collector to the power supply, the base through an additional diode connected to the collector of the power transistor, and an additional resistor is connected between the base and collector of the additional transistor. Sources of information taken into account in the examination 1. The author's certificate of the USSR in application 2692015, cl. H 02 M 1/08, 1978.

2.Konev Yu.I. Electronic technology in automation. M., Soviet Radio, vol. 9, 1977, p. 57, fig. one.

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