SU634437A1

SU634437A1 - Inverter

Info

Publication number: SU634437A1
Application number: SU762373613A
Authority: SU
Inventors: Владимир Михайлович Булык; Богдан Казимирович Гальс
Original assignee: Научно-Исследовательский Институт Управляющих Вычислительных Машин
Priority date: 1976-06-21
Filing date: 1976-06-21
Publication date: 1978-11-25

Description

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Изобретение относитс к области преобразовательной техники и может быть применено во вторичных источниках питани .The invention relates to the field of converter technology and can be applied in secondary power sources.

Известен мостовой самовозбуждающийс инвертор,который обладает пониженным КПД за счет потерь в резисторах запуска .A bridged self-exciting inverter is known, which has a reduced efficiency due to losses in the starting resistors.

Наиболее близким по технической сущности к предложенному вл етс инвертор, содержащий мост на транзисторах , одна диагональ которого подключена к входным выводам, а друга к первичной обмотке трансформатора, обмотки обратной св зи которого подключены к управл ющим переходам транзисторов моста, и св занный с последним узел запуска с пороговым элементом 2 .The closest in technical essence to the proposed is an inverter containing a bridge on transistors, one diagonal of which is connected to the input terminals, and another to the primary winding of the transformer, the feedback windings of which are connected to the control transitions of the bridge transistors, and the node connected to the latter start with a threshold element 2.

Однако при использовании такого инвертора при входном напр жении 300-400 В резко увеличиваютс габа .риты узла запуска, что приводит к увеличению массогабаритных показателей всего устройства.However, when using such an inverter with an input voltage of 300-400 V, the heights of the start-up node increase dramatically, which leads to an increase in the mass-dimensional parameters of the entire device.

Цель изобретени - снижение массогабаритных показателей инвертора.The purpose of the invention is to reduce the weight and dimensions of the inverter.

Это достигаетс тем, что в предложен ном инверторе, содержащем мост на транзисторах, одна диагональ которого подключена к входным выводам, а .друга - к первичной обмотке трансформатора , обмотки обратной св зи которого подключены к управл ющим переходам транзисторов моста, и св занный с последними узел запуска с пороговым элементом, узел запуска снабжен дополнительным транзистором и импульсным трансформатором, а в качестве порогового элемента применен КС-одновибратор, вход которого подключен к входным выводам, а выход через резисторы подключен к базе дополнительного транзистора и к концу первичной обмотки импульсного трансформатора , другой конец которой соединен с одним из силовых электродов дополнительного транзистора, другой силово электрод которого подсоединен к одному из входных выводов, причем вторичные обмотки импульсного трансформатора подсоединены через диоды и резисторы к управл ющим переходам транзисторов моста.This is achieved by the fact that in the proposed inverter containing a bridge transistors, one diagonal of which is connected to the input terminals, and the other to the primary winding of the transformer, the feedback windings of which are connected to the control transitions of the bridge transistors, and connected to the latter the start node with a threshold element, the start node is equipped with an additional transistor and a pulse transformer, and as a threshold element, a CS one-oscillator is applied, the input of which is connected to the input terminals, and the output through resis The bores are connected to the base of the additional transistor and to the end of the primary winding of the pulse transformer, the other end of which is connected to one of the power electrodes of the additional transistor, the other power electrode of which is connected to one of the input terminals, and the secondary windings of the pulse transformer are connected via diodes and resistors to the control transitions of bridge transistors.

На чертеже показана электрическа схема предложенного инвертора.The drawing shows the electrical circuit of the proposed inverter.

Claims

The bridge self-excited converter contains a threshold element for which an RC-single-oscillator1 is used, made on a T1 aneistor analog of a two-base diode (transistors 2, 3, resistors 4, 5 and 6) HRC-circuit (resistor 7 and storage capacitor 8), pulsed transformer 9 , additional transistor; 10. The primary winding 11 of the transformer 9 through a resistor 12 (limiting the collector current of the transistor when the core of the transformer 9 is saturated) and the transistor 10 is connected to a capacitor 8, the secondary winding 13 (14) of the transformer is connected through a series-connected diode 15 (16) and resistor 17 (18) is connected to the emitter junction of the transistor 19 (20) of the bridge 21. Resistors 17 and 18 serve to limit the amplitude, triggering pulses, and the diodes 15 and 16 to prevent shunting by starting the emitter junction of the transistors 19 and 20 mations, when they are open. When a constant voltage source is connected, the transistor 2 is locked until the voltage on the capacitor 8, increasing exponentially, does not exceed the voltage on the resistor 5. Once the voltage on the capacitor 8 reaches the specified level, the transistors 2 open in an avalanche manner. , 3, and the discharge current of this capacitor, which flows through the current-limiting resistor 6 and the electromagnetic transition of the transistor 10, opens the latter. Thus, a winding 11 is connected via a resistor 12 to a capacitor 8. In each of the windings 13 and 14, a single current pulse occurs (its duration is determined by the time of magnetization reversal of the transformer core from the residual induction to the induction of saturation). The transistors 19 and 20 are opened by one of the diagonals of the bridge 21, so the latter is triggered. Since synchronous start-up pulses are supplied to the inverter only at the moment of connecting the input voltage (after discharge of the capacitor 8, the transistors 4 and 5 are in the on state), when a short circuit in the load circuit occurs, the inverter generates a breakdown and reliable locking of its transistors that eliminates overheating. The energy needed to start up is accumulated by the capacitance of the capacitor from the input source through the resistor 7, whose resistance is high. The resistance of this resistor is easy to select so that the loss in the trigger does not exceed .1% of the output power of the converter. All trigger elements, with the exception of rheistors 4, and 7, are selected for low arrays, which makes it possible to reduce the overall dimensions of the inverter. Claims of Invention: An inverter comprising a bridge on a stringer, one diagonal of which is connected to the input pins, and the other a primary winding of a transformer that feeds the feedback winding connected to the control transitions of the bridge transistors and associated with the gray start node with a threshold element By the fact that, in order to reduce its mass and size parameters, this triggering node is equipped with an additional transistor and a pulse transformer, and an RC single-oscillator is used as the threshold element, the input to is connected to the input terminals of the inverter, and the output, through resistors, to the base of the additional transistor and to the end of the primary winding of the pulse transformer, the other end of which is connected to one of the power electrodes of the additional transistor, the other power electrode of which is connected to one of the input terminals of the inverter The secondary windings of the pulse transformer are connected via diodes and resistors to the control transitions of the bridge transistors. Sources of information taken into account in the examination: 1. Power sources on semiconductor devices, edited by SD. Dodika and E.I. Galp 5rina, M., Soviet Radio, 1969 p. 232, fig. V For.

2. US patent number 3516020, class. 331113, 1970.

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