SU773863A1

SU773863A1 - Dc voltage converter

Info

Publication number: SU773863A1
Application number: SU792752848A
Authority: SU
Inventors: Анатолий Васильевич Сибирев; Римма Евгеньевна Шустова
Original assignee: Предприятие П/Я В-8769
Priority date: 1979-04-16
Filing date: 1979-04-16
Publication date: 1980-10-23

Description

(54) ПРЕОБРАЗОВАТЕЛЬ ПОСТОЯПНОГО НАПРЯЖЕНИЯ(54) CONSTANT VOLTAGE CONVERTER

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Изобретение относитс к электротехнике и может быть использовано в качестве вторичного источника питани радиоэлектронной аппаратуры.The invention relates to electrical engineering and can be used as a secondary source of power for electronic equipment.

Известны устройства, содержащие задающий генератор, выполненный по двухтактной схеме, и двухтактный усилитель мощнеети 1.The known device containing the master oscillator, made by the push-pull circuit, and push-pull amplifier power network 1.

Недостатками таких устройств вл етс наличиесквозных токов, возникающих в первичной обмотке выходного трансформатора усилител мощности при переключении транзисторов , обусловленных временем включени и выключени транзисторов, и на.тичие токов короткого замыкани во вторичной обмотке выходного трансформатора усилител мощности в случае подключени к вторичной обмотке трансформатора выпр мител с фильтром, обусловленных временем включени и выключени диодов выпр мител .The drawbacks of such devices are the presence of through-currents arising in the primary winding of the output transformer of the power amplifier when switching transistors, due to the time of switching on and off of the transistors, and other short-circuit currents in the secondary winding of the output transformer of the power amplifier in the case of connection to the secondary winding of the transformer. with filter, due to the on and off times of the rectifier diodes.

Аналогичные недостатки свойственны источникам питани с частотной модул цией, содержащим управл емый по частоте задающий генератор и двухтактный усилитель мощности 2.Similar drawbacks are found in frequency modulated power sources containing a frequency controlled driving oscillator and a push-pull power amplifier 2.

Известен также преобразователь посто нного напр жени , содержащий двухтактный инвертор на транзисторах, переходы эмиттербаза которых защунтированы диодами, трансформатор с коллекторной обмоткой и обмоткой возбуждени , генератор тактовых импульсов, подключенный через дополнительный узел запуска к средней точке обмотки возбуждени трансформатора инвертора, и запирающий узел, включенный в эмиттерные цепи транзисторов инвертора, выход запиЮ рающего узла через дополнительно введенные диоды подключен к базам транзисторов инвертора 3.A DC converter is also known, which contains a push-pull inverter on transistors, the emitter base transitions of which are ground by diodes, a transformer with a collector winding and an excitation winding, a clock generator connected through an additional start node to the middle point of the inverter winding of the inverter transformer, and a locking node connected to the emitter circuit of the inverter transistors, the output of the locking node through the additionally introduced diodes connected to the bases of the transistors of the inverter 3

Недостатками данного устройства вл ютс зависимость момента выключени тран15 зисторов инвертора от параметров трансформатора преобразовател , зависимость крутизны фронтов управл ющих импульсов от параметров реактивных элементов в управл ющих цеп х преобразовател .The disadvantages of this device are the dependence of the moment when the inverter transistors turn off on the parameters of the transformer of the converter, the dependence of the steepness of the fronts of the control pulses on the parameters of the reactive elements in the control circuits of the converter.

Claims

The closest DC voltage converter closest to the proposed device contains a master oscillator and a power amplifier connected to the input terminals of the converter 4. The disadvantages of such a DC voltage converter are the complexity of the current surge prevention scheme, which increases the power loss in the circuit x signal conversion. The purpose of the invention is to simplify the device and reduce power consumption. This goal is achieved by the fact that in a known DC / DC converter, two additional circuits are connected to the input terminals, each of which consists of a series-connected power circuit of a transistor, a resistor and a tunnel diode, and each output of the master oscillator is connected via an additional resistor to the base of the transistor of the corresponding chain, parallel to the base-emitter junction of which a capacitor is connected, and connected to the junction point of the resistor and tunnel diode of each chain The corresponding inputs are the power amplifier. Such technical solution allows obtaining the necessary time delay between the inputch signals of the power amplifier and, thus, eliminating the circuit of logic devices ensuring the formation of a similar time delay and multiple conversion of the signal of the master oscillator. The drawing shows a schematic diagram of the device. The DC converter contains a master oscillator 1 with a push-pull output, each output of which is connected to the input of power amplifier 2 through a series-connected resistor 3, a capacitor 4, in parallel with which is connected the base-emitter junction of transistor 5, the collector of which is connected to the power supply, resistor 6 , tunnel diode 7, in parallel with which is connected the input of the power amplifier. The converter voltage is as follows. A positive pulse from one of the outputs of the master oscillator 1 charges the capacitor 4 along the circuit: the output of the master oscillator 1, resistor 3, resistor 6, tunnel diode 7. At the same time, the charge current of capacitor 4 should be much less than the switching current of the tunnel diode 7, This is achieved by selecting the resistance of the resistors 3 and 6. The operating point of the tunnel diode 7 is at the beginning of the current-voltage characteristic, as a result of which the signal arriving at the corresponding input of the power amplifier 2 is not enough to turn it on. When the capacitor 4 reaches a voltage sufficient to unlock the transistor 5, the collector current of the transistor increases, which creates a potential difference across the electrodes of the tunnel diode that is sufficient for switching it, the tunnel diode 7 switches, and the corresponding input of the power amplifier 2 receives a signal to turn it on . When a signal is switched at the output of master oscillator 1, transistor 5 is closed, capacitor 4 is applied to tunnel diode 7 in reverse polarity, which turns off tunnel diode 7, and a signal is generated from the second input of power amplifier 2 in the above sequence. By selecting the capacitance of the capacitor 4, the required time delay between the input signals of the power amplifier 2 is obtained. Application in the device of the tunnel diode 7 provides for the formation of input pulses of the power amplifier 2 with a short duration of the front and rear edges and, therefore, minimal power loss at the transistors of the power amplifier. Claims of the Inverter A DC converter containing a master oscillator and a power amplifier connected to the input terminals of the converter, characterized in that, in order to simplify the device and reduce the power consumption, two additional circuits are connected to the input terminals, each of which consists of connected to the power circuit of the transistor, resistor and tunnel diode, and each output of the master oscillator through an additional resistor is connected to the k base of the said transistor The main circuit, parallel to the base-emitter junction of which a capacitor is connected, and the corresponding inputs of the power amplifier are connected to the junction point of the resistor and tunnel diode of each chain. Sources of information taken into account in the examination 1. USSR author's certificate number 545055, cl. H 02 M 7/537, 1977.

2. Information sheet No. 76-0231.

3. USSR author's certificate number 581557, cl. H 02 M 3/335, 1977.

4.Information sheet number 76-0955.

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