SU987604A2

SU987604A2 - Dc voltage stabilizer

Info

Publication number: SU987604A2
Application number: SU813292636A
Authority: SU
Inventors: Анатолий Иванович Слободянюк; Соломон Аронович Керцман; Борис Иссакович Чемерисов; Александр Владимирович Гусев
Original assignee: Предприятие П/Я А-3361
Priority date: 1981-05-26
Filing date: 1981-05-26
Publication date: 1983-01-07

Description

Изобретение относится к электротехнике и может быть использовано в устройствах электропитания, автоматики, измерительной и вычислительной техники.The invention relates to electrical engineering and can be used in devices of power supply, automation, measuring and computer technology.

По основному авт. св. № 796819, известен стабилизатор постоянного напря-⁵жения, содержащий последовательный составной регулятор, состоящий из силового и согласующего транзисторов раз— * личной проводимости и токостабилизируюшего двухполюсника на транзисторе, . подключенного к точке соединения составного регулятора с входной клеммой, а база транзистора токостабилизирующего двухполюсника и коллектор последнего согласующего транзистора составного регулятора подключен к одному иэ выводов р — п перехода, другой вывод которого подключен к базе и через резистор к эмиттеру силового транзистора состав- 20 ного регулятора [ 1 .According to the main author. St. № 796 819 is known a permanent stabilizer ⁵ The stresses zheniya containing serial integral regulator, consisting of power transistors and matching different personal * tokostabiliziruyushego conductivity and two-pole in the transistor. connected to the connection point of the composite controller with the input terminal, and the base of the transistor of the current-stabilizing two-terminal device and the collector of the last matching transistor of the composite controller is connected to one of the terminals of the p - p junction, the other terminal of which is connected to the base and through the resistor to the emitter of the power transistor of the composite controller [ 1 .

Недостатком известного стабилизатора является ненадежный запуск стабилизатора при выполнении схемы на кремневых транзисторах с малым значением обратных* токов и повышение стабильности выход— ’ного напряжения при изменении питающего напряжения.A disadvantage of the known stabilizer is the unreliable start of the stabilizer when performing the circuit on silicon transistors with a small value of reverse * currents and increasing the stability of the output voltage when the supply voltage changes.

Цель изобретения - улучшение условий запуска и повышение стабильности выходного напряжения.The purpose of the invention is to improve the starting conditions and increase the stability of the output voltage.

Поставленная цель достигается тем, что в стабилизатор постоянного напряжения введены транзистор запуска, второй, третий и четвертый резисторы, причем коллектор транзистора запуска подключен через второй резистор к базе транзио- ¹тора токостабилизирующего двухполюсника, эмиттер- к коллектору силового транзистора, а база соответственно через третий резистор подключена к эмиттеру силового транзистора и к одному из выводов четвертого резистора, другой вывод которого подключен к эмиттеру транзистора усилительного каскада.This goal is achieved by the fact that a start transistor, second, third and fourth resistors are introduced into the DC voltage stabilizer, and the collector of the start transistor is connected through the second resistor to the base of the transistor ^{1 of the} current-stabilizing two-terminal device, the emitter to the collector of the power transistor, and the base, respectively, through the third the resistor is connected to the emitter of the power transistor and to one of the terminals of the fourth resistor, the other terminal of which is connected to the emitter of the transistor of the amplifier stage.

На чертеже представлена принципиальная схема стабилизатора постоянного напряжения.The drawing shows a schematic diagram of a DC voltage stabilizer.

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Стабилизатор напряжения содержит последовательный составной регулятор 1, собранный по схеме с дополнительной симметрией на силовом 2 и согласующих 3 и 4 транзисторах, причем база транзио-5 тора 5 и коллектор транзистора 4 подключены к одному из выводов диода 6, противоположный вывод которого подключен к базе и через резистор 7 к эмиттеру транзистора 2, транзистор 8 запуска, 10 коллектор которого через резистор 9 подключен к точке соединения диода 6 с базой транзистора 5 токостабилизаторд и коллектором последнего согласующего транзистора 4, эмиттер транзистора 8 15 запуска соединен с коллектором силового транзистора 2, база транзистора 8 запуска через резистор 10 соединена с эмиттером транзистора 5 и с одним из выводов резистора 11, другой вывод 20 которого соединен со стабилитроном 12 и с эмиттером транзистора 13 усилительного каскада.The voltage stabilizer contains a serial composite controller 1, assembled according to the circuit with additional symmetry on the power 2 and matching 3 and 4 transistors, the base of the transistor 5 of the torus 5 and the collector of the transistor 4 connected to one of the terminals of the diode 6, the opposite terminal of which is connected to the base and through a resistor 7 to the emitter of transistor 2, a start transistor 8, 10 whose collector is connected through a resistor 9 to the junction point of the diode 6 with the base of the current stabilizer transistor 5 and the collector of the last matching transistor 4, emitt The transmitter transistor 8 15 of the trigger is connected to the collector of the power transistor 2, the base of the trigger transistor 8 through the resistor 10 is connected to the emitter of the transistor 5 and to one of the terminals of the resistor 11, the other terminal 20 of which is connected to the zener diode 12 and the emitter of the amplifier transistor 13.

Стабилизатор работает следующим образом. 25The stabilizer works as follows. 25

При включении стабилизатора через резистор протекает базовый ток транзистора 8, который открывается·. Через эмиттер-базовый переход транзистора 2, диод 6, резистор 9 протекает ток „ вызы- 30 вающий включение транзистора 2 и нарастание напряжения на выходе стабилизатора. Когда выходное напряжение достигает-. величины, определяемой напряжением пробоя стабилитрона 12, ток протекает через резистор 11, что приводит к запиранию транзистора 8.When you turn on the stabilizer through the resistor flows the base current of the transistor 8, which opens ·. A current flows through the emitter-base junction of transistor 2, diode 6, and resistor 9, which causes 30 to turn on transistor 2 and increase the voltage at the output of the stabilizer. When the output voltage reaches-. the value determined by the breakdown voltage of the zener diode 12, the current flows through the resistor 11, which leads to the locking of the transistor 8.

Изменения входного питающего напряжения приводят к изменениям тока через резистор 10, резистор 11 и стабилитрон 40 12, при этом полярность приращения напряжения на стабилитроне 12 такова, что транзистор 13 усилительного каскада . изменяет свое проводящее состояние и, следовательно, потенциал базы транзистора 4 регулятора 1 в направлении, прет пятствующем изменениям выходного напряжения, тем самым повышая стабильность выходного напряжения стабилизатора.Changes in the input supply voltage lead to changes in the current through the resistor 10, the resistor 11, and the zener diode 40 12, while the polarity of the voltage increment on the zener diode 12 is such that the transistor 13 of the amplifier stage. changes its conductive state and, therefore, the base potential of the transistor 4 of the regulator 1 in the direction that prevents changes in the output voltage, thereby increasing the stability of the output voltage of the stabilizer.

Таким образом, предлагаемая схема стабилизатора позволяет повысить стабильность выходного напряжения при изменениях входного питающего напряжения и обеспечить Надежный запуск стаби- ’ лизатора.Thus, the proposed stabilizer circuit makes it possible to increase the stability of the output voltage with changes in the input supply voltage and to ensure reliable start of the stabilizer.

Claims

The invention relates to electrical engineering and can be used in power supply, automatics, measuring, and electrical engineering devices. According to the main author. St. No. 796819, a DC voltage regulator is known, containing a series composite regulator consisting of power and matching transistors of different conductivity and a current-stabilized two-pole circuit on a transistor connected to the connection point of the composite regulator with an input terminal, and the base of the current-stabilizing two-pole circuit and collector after the matching transistor of the composite regulator is connected to one of the p - n junction pins, the other output is co-connected to the base and through a resistor to Mitter power transistor sostavkogo regulator 1. A disadvantage of the known stabilizer is the unreliable start of the stabilizer when the circuit is flooded on silicon transistors with a low value of reverse currents and the stability of high voltage is increased when the supply voltage changes. The purpose of the invention is to improve the starting conditions and improve the stability of the output voltage. The goal is achieved by introducing a start-up transistor, a second, third and fourth resistors into the DC voltage regulator, the collector of the starting transistor is connected through the second resistor to the base of the current-controlled two-pole transistor, and emitter to the collector of the power transistor, and the base through the third resistor connected to the emitter of the power transistor and to one of the terminals of the fourth resistor, the other output of which is connected to the emitter of the transistor of the amplifier cascade. The drawing shows a schematic diagram of a constant voltage regulator. & The voltage regulator contains 1, a serial composite controller assembled according to a circuit with additional symmetry on the power 2 and matching 3 and 4 transistors, the base of the transistor 5 and the collector of the transistor 4 being connected to one of the terminals of the diode 6, the opposite terminal of which is connected to the base and through the resistor 7 to the emitter of the transistor 2, the start transistor 8, the collector of which through the resistor 9 is connected to the connection point of the diode 6 with the base of the current stabilizing transistor 5 and the collector of the last matching transistor 4, emit p transistor 8 is connected to the trigger circuit the collector of transistor 2, transistor base 8 run through the resistor 10 is connected to the emitter of the transistor 5 and one of vshodov resistor and the other terminal of which is connected to the Zener diode 12 and the emitter of the transistor 13 of the amplifier stage. The stabilizer works as follows. When the stabilizer is turned on, the base current of the transistor 8 flows through the resistor, which opens -. Through the emitter-base transition of the transistor 2, the diode 6, the resistor 9 current flows. causing the transistor 2 to turn on and the voltage at the output stabilizer increases. When the output voltage reaches a sufficient value determined by the voltage of the breakdown of the zener diode 12, current flows through the resistor 11, which causes the transistor 8 to lock. changes in current through resistor u, resistor 11 and zener diode 12, while the polarity of the increment 44 of the voltage on the zener diode 12 is such that the transistor 13 of the amplifier stage changes its conducting state and, therefore, the potential of the bases the transistor 4 of the regulator 1 in a direction that changes the output voltage, thereby increasing the stability of the output voltage of the stabilizer. Thus, the proposed stabilizer circuit improves the stability of the output voltage when the input supply voltage changes and ensures reliable starting stabilizer. Formula invented Constant Voltage Stabilizer according to author. St. No. 796819, characterized in that, in order to improve the starting conditions of the stabilizer and increase the stability of the output voltage. A start-up transistor is inserted in it, the second, third and fourth resistors, the start-up transistor collector is connected via the second resistor to the current-stabilized two-pole transistor base, the emitter is connected to the power transistor collector, and the base is respectively connected to the emitter of the power transistor and one of the terminals the fourth resistor, the other output of which is connected to the emitter of the transistor of the amplifier cascade. Sources of information taken into account in the examination 1. USSR author's certificate №796819, cl. G, 05 F 1/56, 1979.