SU813619A1 - Pulse converter - Google Patents

Description

(54) PULSE CONVERTER

The invention relates to a conversion technique and can be used in the development of secondary power sources. Pulse converters containing an input filter, a chopper, an output capacitor, and a load l are known. The closest technical solution to the present invention is a pulse converter containing an input LC filter, a key element, a storage choke, a discharge diode and an output filter 2. The disadvantage of these devices is the increased ripple of the output voltage due to the presence of pulse currents in the output capacitor . The purpose of the invention is to reduce the ripple level of the output voltage. The goal is achieved by the fact that a converter containing the input LC filter connected to it via a controllable key element is a storage choke to which the output capacitor and load are connected through a discharge diode and two diodes are inserted to the common output of the converter through one of these diodes and to the output output - through another diode connected in the opposite direction. The drawing shows a schematic diagram of the proposed Converter. The converter contains an input filter consisting of droplets 1 and a capacitor 2, which through diode 3 is connected to the common output of converter 4 and through diode 5 to the output terminal 6, controlled by key element 7, a storage choke 8, to which through diode 9 bits Yes, the output capacitor 10 and the load 11 are connected. The converter operates as follows. When key 7 is closed, current flows through choke 8. When key 7 is open, capacitor 10 is charged through diode 9 with key of throttle 8 and simultaneously to load 11. With key closed, capacitor 10 is discharged to load 11, and energy of throttles 8 is replenished by current along the input circuit. In contrast to the known converter, the charge of the capacitor 10 occurs continuously. I, with the key open, the choke 8 - diode 9, with

closed - switch 7 - choke O - KO desator 10 - diode 5 - capacitor 2. Since currents through chokes 1 and 8 cannot instantly change, at the first moment of after-closing the switch 7 through capacitor 10 does not change (in a known converter, the first The current through the capacitor 10 changes abruptly. Subsequently, the current through the inductance 8 increases smoothly by the value of l, and when the key is opened, the current through the capacitor decreases smoothly by DE. In the practical implementation of the proposed device, AEL el (f tve lz rear.

Diodes 3 and 5 Required to separate the charge and discharge circuits of capacitor 2 and 10. Direct connection of capacitor EA 2 to the output terminal at the moment of switching on the capacitor 10 causes a reverse polarity voltage. In the event that this jump is valid, diodes 3 and 5 may be absent only to reduce the reverse-polarity voltage pulse, the capacitor 10 must be replaced by a reverse diode or a zener diode.

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The positive effect of the application of the invention is to reduce the level of current ripple and voltage at the output of the converter.

Claims (2)

1. Aleksandrov F.I. and Sivakov A.R. Pulse converters and stabilizers. L., Energie, 1970, pp.13,14 fig. 1-6. 2.Birznieks L.V. DC Switching Converters. M., Energie, 1974, p.105, fig.5.1, a.