SU760415A1 - Storage capacitor charging device - Google Patents

Description

The invention relates to a pulse technique, and in particular to devices for charging storage capacitors used in high-voltage generators of current sources, 5 powered by low-voltage DC sources.

A device for charging a storage capacitor is known, consisting of a master oscillator, an inverter, an inductive-capacitive converter, a summing device, a transformer, a rectifier and a storage capacitor [1].

The disadvantages of this battery charger are the complexity of the circuit, and, consequently, low reliability and large weight and size indicators.

ζ The closest in technical essence to the present invention is a 20 device for charging a storage capacitor containing a DC voltage source connected via thyristors to two series-connected windings of the choke and 25 series-connected capacitors, the connection point of which is connected to the common terminals of the windings of the choke, as well as the output winding throttle connected via rectifier 30

2

purging device to a storage capacitor [2].

Due to the transformer connection of the windings of the choke, an increase in the voltage on the thyristors of the primary circuits is observed; in addition, the relatively short time of the locking voltage of the thyristors results. to a decrease in the use of thyristors, and, consequently, to a decrease in the maximum possible frequency of their work, which leads to an increase in size and weight.

The purpose of the invention is to improve the reliability and improvement of weight and size indicators. · ·

This is achieved by the fact that in the device for charging the storage capacitor containing a DC voltage source, connected through thyristors to two series-connected windings of the choke and series-connected capacitors, the connection point of which is connected to the common terminals of the choke windings and connected through a rectifier device to the storage capacitor, the windings of the choke are made on two cores, with the addition of ³ added. · 760415 4

relatively second output winding and second rectifier. The device, which is included. parallel to the First output winding and the first rectifier device, and each rectifier device is a diode and a thyristor connected in series with It, the control electrode of which is connected to the anode through a dynistor and a resistor. In addition, the thyristors of the rectifying devices are shunted by anti-parallel diodes.

/ In the drawing shows the basic electrical circuit of the proposed device. / ^

The device for charging a kapitalic capacitor contains a source of constant voltage .1 with 2.3 capacitors connected in series, connected in series with each other, connected in series to a constant voltage source thyristor 4, primary windings of chokes 5 and b and thyristor 7, output windings of chokes 8, 9 are connected through the thyristors 10, 11 and diodes 12, 1.3 to the storage capacitor 14, the control electrodes of the thyristors 10, 11 are connected through dynistor 15, 16 and re ^: systors 17, 18 to their anodes, and themselves. .thyristors 10 and 11 are shunted in ......

Reverse directions are diodes 19 and 20.

The device works as follows. / /; '/.

After the thyristor 4 is opened, through the primary winding of the choke 5, capacitors 2 and 3 are recharged, which change the sign of their voltage. After changing the sign of the voltage and reaching the output winding of the choke 8 voltage equal to

The sum of the output voltage (0β _ωλ ) and the breakdown voltage of the dynistor 15, the dynistor breaks through and the thyristor 10 opens. 4 a reverse voltage appears, the thyristor is locked, the flux linkage ^: passes from the primary winding 5 and the output winding of the choke 8.

The presence of two cores makes it possible to turn on the thyristor 7, when the flux linkage in the core has not reached zero, which reduces the voltage level on it.

Thyristors 10 and 11 and dynistors 15 and 16 are installed to improve the switching conditions of thyristors 4 and 7.

The role of the rectifying elements, to which all the reverse voltage is applied in the output circuit, is performed by the Odes' 12 and .13, therefore the thyristors 10 and 11 are shunted by anti-parallel, diodes 19 and 20 of low power.

The proposed device does not contain. It has high voltage on the thyristors of the primary circuits, has.

the relatively short time of the thyristor blocking voltage, which leads to an increase in ^: the utilization rate of the thyristors and, consequently, an increase in the maximum possible frequency, and a decrease in

_: 2-3 times the weight and size indicators.

Claims (2)

Claim 20 : ' 1. A device for charging a storage capacitor containing a source of a constant voltage, connected through thyristors to two sequentially connected windings of the choke and series-connected capacitors, the connection point of which is connected to the common terminals of the windings of the choke, as well as the output __ winding of the choke, connected through a - ⁰ rectifier to the accumulator telnomu capacitor, from l and h a-. I wish you that, for the purpose of raising. Sense of reliability and improvement of all-performance indicators, windings of the ^{33 33} grounding circuits are made on two cores, with the addition of a second output winding and a second 'rectifier device, which are connected in parallel with the first output winding and / or rectifier device' the device is a diode and a thyristor connected in series with It, whose control electrode is connected to / DS to the anode through dynistor and resisor • tor. '··' 2. Device on π, 1, about aphid - .. that is, so that the thyristors .. rectifying devices are _{bridged by anti} -parallel diodes of the EC '