SU813620A1

SU813620A1 - Dc voltage converter

Info

Publication number: SU813620A1
Application number: SU792783401A
Authority: SU
Inventors: Адриан Борисович Апаров; Борис Алексеевич Попов; Михаил Александрович Шумов
Original assignee: Московский Ордена Ленина Энергети-Ческий Институт
Priority date: 1979-06-25
Filing date: 1979-06-25
Publication date: 1981-03-15

Description

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

1one

Изобретение относитс к электротехнике и может быть использовано в системах вторичного электропитани дл изменени уровн посто нного напр жени посредством транзисторных преобразователей.The invention relates to electrical engineering and can be used in secondary power supply systems for changing the DC voltage level by means of transistor converters.

Известны транзисторные преобразователи , содержащие выходной насыщающийс трансформатор, два транзистора и выпр мительный мост Использование в таких преобразовател х полевых транзисторов повышает КПД, так. как резко уменьшаетс мощность управлени транзистором.Transistor converters are known which contain an output saturating transformer, two transistors, and a rectifying bridge. The use of such field-effect transistors in such converters improves efficiency, so. how dramatically the transistor control power decreases.

Наиболее близким к предлагаемому вл етс преобразователь на полевых транзисторах, силова часть которого выполнена по схеме с выводом средней точки первичной обмотки трансформатора , концы вторичной обмотки через мостовой выпр итель соединены с нагрузкой , а концы управл ющих обмоток подключены к затворам полевых транзисторов 2.The closest to the present invention is a converter in field-effect transistors, the power part of which is made according to the circuit with the output of the midpoint of the transformer primary winding, the ends of the secondary winding are connected to the load via a bridge rectifier, and the ends of the control windings 2 are connected to the gates.

Недостатком данных схем вл етс наличие специальных управл ющих обмоток трансформатора дл питани цепей затворов полевых транзисторов, что пoв Jшaeт габариты преобразователей и снижает его КПД.The disadvantage of these circuits is the presence of special control windings of the transformer for powering the gate circuits of field-effect transistors, which is much smaller than the dimensions of the converters and reduces its efficiency.

Цель изобретени - повышение КПД и уменьшение габаритов преобразовател .The purpose of the invention is to increase efficiency and reduce the size of the converter.

Поставленна цель достигаетс тем, что в преобразователе посто нного напр жени выход выпр мител соединен через цепь нагрузки с входными выводами преобразовател , а затвор каждого, полевого транзистора соеди0 нен с соответствующим концом вторичной обмотки выходного трансформатора.The goal is achieved by the fact that in a constant voltage converter the output of the rectifier is connected via a load circuit to the input terminals of the converter, and the gate of each field-effect transistor is connected to the corresponding end of the secondary winding of the output transformer.

На чертеже приведена схема предлагаемого преобразовател .в случае использовани МДП полевых транзисторов со встроенным каналом п-типа.The drawing shows a diagram of the proposed converter in the case of using MIS field-effect transistors with an integrated n-type channel.

5five

Преобразователь содержит трансформатор 1 с двум обмотками: первичной 2 и вторичной 3. Отвод от средней точки первичной обмотки 2 соединен со вторым входным выводом преобразовател дл подключени источника 4 питани . Концы первичной обмотки 2 соединены со стоками транзисторовThe converter contains a transformer 1 with two windings: primary 2 and secondary 3. Diversion from the midpoint of the primary winding 2 is connected to the second input terminal of the converter for connecting source 4 of the power supply. The ends of the primary winding 2 are connected to the drains of transistors

5 и 6, истоки которых соединены с5 and 6, whose origins are connected to

Claims

the first input terminal of the converter. The ends of the secondary winding 3 of the transformer 1 are connected to the gates of transistors 5 and 6, as well as to the input of the bridge rectifier 7. The output of the rectifying bridge 7 through the load 8 is connected to the power source 4 The converter operates as follows. With an open transistor 5, the voltage of the source 4 is applied to the primary winding 2 of the transformer 1. The voltage on the secondary winding 3 is directed so that the transistor 5 remains open and the transistor b is locked. The secondary current, which is the load current, closes the loop; rectifying bridge 7, source 4, load 8, rectifying bridge 7. Under the action of the voltage applied to the primary winding 2 of transformer 1, its magnetic circuit is re-magnetized. At the moment of saturation of the magnetic circuit, the magnetizing current of the transformer sharply increases, and, consequently, the drain current of the transistor 5, as a result of which it goes into the active region. The voltage across the transistor 5 increases, and on the secondary winding 3 decreases and changes sign. Transistor 5 closes and transistor b opens. Further, the processes in the circuit are repeated. The absence of additional windings of the transformer reduces the size. And increases the efficiency of the device. Claims of a DC converter containing an output transformer, horses; the primary winding of which is connected to one of the input terminals of the converter through two field-effect transistors, and the outlet from the midpoint of the specified primary winding is connected to another input terminal of the converter, and the bridge rectifier, the input of which is connected to the ends of the secondary winding of the output transformer, characterized in that, in order to increase efficiency and reduce the size, the output of said rectifier is connected Through a load circuit with input terminals of the converter, and the gate of each field-effect transistor is connected to the corresponding end of the secondary winding of the output transformer. Sources of information protection taken into account during the examination 1. England patent number 1392439, cl. H 2 F, 1975. 2, US Patent No. 3975671, cl. 321-15, 1977.