SU773859A1

SU773859A1 - Secondary power source

Info

Publication number: SU773859A1
Application number: SU792722207A
Authority: SU
Inventors: Виктор Давидович Вогман
Original assignee: Ленинградский Электротехнический Институт Связи Им. Проф. М.А.Бонч-Бруевича
Priority date: 1979-02-02
Filing date: 1979-02-02
Publication date: 1980-10-23

Description

(54) ВТОРИЧНЫЙ ИСТОЧНИК ПИТ.ЛНИЯ(54) SECONDARY SOURCE PET.LNIYa

II

Изобретение относитс к преобразовательной технике и может быть использовано в качестве стабилизированного источника посто нного напр жени , обладающего высоким КПД и надежностью.The invention relates to a converter technique and can be used as a stabilized source of constant voltage with high efficiency and reliability.

Известен вторичный источник питани (ВИП) с электронной регулировкой напр жени , содержащий первичный источник питани , регулируемый и нерегулируемый ключевой преобразователь, на выходе регулируемого преобразовател включен фильтр нижних частот 1.A secondary power supply with electronic voltage regulation is known, which contains a primary power source, an adjustable and unregulated key converter, and a low-pass filter is turned on at the output of the adjustable converter.

Недостатком устройства вл етс перегрузка нерегулируемого преобразовател в момент включени ВИП, обусловленна постепенным по влением напр жени на выходе регулируемого преобразовател , а также значительна перегрузка по току регулируемого преобразовател , св занна с переходным процессом в фильтре нижних частот, включенным на его выходе.The disadvantage of the device is the overload of the unregulated converter at the moment of switching on the VIP, caused by the gradual occurrence of voltage at the output of the adjustable converter, as well as the significant current overload of the adjustable converter associated with the transient in the low-pass filter enabled at its output.

Наиболее близким к предлагаемому вл етс вторичный источник питании, содержащий ключевой преобразователь, вход которого подключен к выходу узла «м гкого запуска, присоединенного через фильтр нижних частот ко входным выводам устройства , а выход соединен с органом управлени 2.Closest to the present invention is a secondary power source containing a key converter, the input of which is connected to the output of a soft start node connected through a low-pass filter to the input terminals of the device, and the output connected to control 2.

Принцип действи ВИП сводитс к следующему . При включении первичного источника питани производитс плавное увеличение напр жени питани регулируемогоThe principle of the VIP is as follows. When the primary power source is turned on, the supply voltage of the regulated supply is gradually increased.

ключевого преобразовател с помощью устройства «м гкого запуска. При перегрузке по току при включении сигнал с органа управлени воздействует на устройство «м гкого запуска, которое отключает ключевой key converter using soft start device. In the event of overcurrent on power up, the signal from the control element acts on the soft start device, which disables the key

10 преобразователь и фильтр нижних частот от первичного источника питани (в данном частном случае фильтр нижних частот одновременно входит в состав преобразовател ).10, a converter and a low-pass filter from the primary power source (in this particular case, a low-pass filter is simultaneously included in the converter).

Недостатком ВИП вл етс перегрузка The disadvantage of the VIP is overload

15 преобразовател в момент включени , св занна с протеканием сквозных токов. По вление сквозных токов при включении обусловлено повьнпенной инерционностью электронных ключей при низких напр жени х 15 of the converter at the time of connection, associated with the flow of through currents. The occurrence of through currents upon switching on is due to the inertia of electronic switches at low voltages.

20 питани и, следовательно, низких токах коллектора .20 power and therefore low collector currents.

Claims

Despite the use of special protection measures, through-currents are the most common cause of failure of a key converter. The purpose of the invention is to improve the reliability of the VIP by eliminating through currents when switched on while maintaining the "soft start" mode of the device. The goal is achieved by the fact that the soft start node is designed as a threshold element and a differentiating circuit connected in series with it, the output of which through a diode is connected to the input of the control, and the input of the differentiating circuit is also connected to the input of the key converter. The drawing shows a diagram of the device. The device contains a primary power source 1 connected through a low-pass filter 2 to a threshold device 3 connected to key converter 4 and an input of differentiating circuit 5, the output of which is connected to control 6 through diode 7. The device operates as follows. When the primary power source 1 is connected, voltage is gradually appearing at the output of filter 2. As soon as the value of this voltage exceeds the threshold value, threshold element 3 is triggered, which ensures the operation of the key converter at the nominal supply voltage. At the same time, with the help of a differentiating circuit 5, when switched on, the minimum possible duration of the excitation pulses is ensured, which gradually increases. Thereby, a soft start of the device is carried out. Upon termination of the differentiating circuit 5, the diode 7 is closed by the output voltage of the VIP and the key transformer operates in nominal mode. The constant time of the differentiating circuit is chosen for a larger period of natural oscillations of the low-pass filter included at the output of the adjustable key converter. The proposed device has a higher reliability compared to the known one, since it provides the switching mode without overloading the active elements of the key converter. As a threshold element one can use a dinistro or a circuit of a similar action. Claims A secondary power supply comprising a key converter, which is connected to the output of a soft start node connected through a low-pass filter to the input terminals of the device, and the output is connected to a control element, characterized in that, in order to increase reliability, the node "Soft start is made in the form of a threshold element and a differentiating circuit connected in series with it, the output of which is connected via a diode to the input of the governing body, and the input of the differentiating circuit is also connected the input of the switching converter. Sources of information taken into account in the examination of 1. Electronic technology in automation. Issue 7, M., “Soviet Radio, 1975, p. 36-45.

2. "Electronics, t. 50, 1977, No. 7. p. 51 - 57.