SU765924A1 - Device for charging storage battery - Google Patents

Description

3765

The disadvantage of the described device as applied to the second-stage charging mode A B is the multipolar pulsed current that overpowers the installed power of the equipment and the current) 1st efficiency.

The aim of the invention is to reduce the installed MONOTA of the equipment and increase the efficiency.

This is achieved by the fact that the opposite-parallel pairs of cells and inverter torsors are connected directly, and the additional thyristors are connected via a three-pole switch between the phase-adjacent ends of the secondary half-windings of the transformer, the beginnings of which are connected via a choke to the output terminals of the device.

A schematic diagram of the device is shown in the drawing.

The device contains a transformer 1 with secondary semi-windings 2 and 3, thyristors 4-12 switches 13 and 14, choke 15 and operates on the battery 16.

Directly parallel-parallel thyristor pairs 4 and 7, 5 and 8, 6 and 9 are connected directly between the adjacent ends of the secondary semi-windings 2 and 3 of the three-phase transformer I and through two-way switch 13 and 13 are thyristors 10, 11 and 12. The beginning of the said half windings 2 and 3 connected via a choke 15, and mounted by a switch 14, to output 111) 1 m of the device.

The first step of charging with a constant, smooth current of increased density is a three-way / two-position two-way switch. Step 13 is in the lower position, connecting rectifying thyristors 7–12 in an annular circuit, and the single-pole switch 14 is in the open position.

When applying to the thyristors 7-12 single control pulses with a phase shift of 60 el. in the order of thyristor numbering 7, 10, 8, I, 9, 12, a sixfold gas mode of rectifying the phase voltage difference of the second half-winding 2 and 3 of transformer 1 is applied to the counter EMF of the battery 16. Thyristors 4-6 are in the uncoupled state. When switching to the second stage of charging the battery with a 150 Hz frequency field with a pulsed frequency current, the control pulses from the thyristors 7-12 are removed, the switch 13 is switched to the upper position and the key element 14 is switched to the shunt choke 15.

When control pulses are applied simultaneously to parallel pairs of rectifying thyristors 7 and 10, 8 and 11, 9 and 12 with a phase shift of 120 electr., A three-pole intermittent rectifying mode is applied to the back-EMF of the battery (without smoothing throttles 15) with the formation of positive pulses of the second stage of the charge of AB.

In the pauses between these positive current pulses, control pulses are applied to inverter thyristors 4, 5, and 6 with a phase shift of 120 electr. and thereby the conditions for the formation of negative current pulses of the subarade AB are provided.

The phase control of the switching angles of the rectifying and inverter thyristors ensures the formation of different-polarity pulses of the required amplitude and duration.

Since the average charge current of the second charge stage is determined by the difference of the average values of positive and negative current pulses, the largest charge of the charging device in terms of current (and power) corresponds to the second charge level.

The formation of current impulses with a frequency of 150 Hz. Transposition of the phases of the secondary half windings of the transformer eliminates the biasing of the transformer and, accordingly, a significant decrease in its mass-dimensional parameters, especially noticeable at powers above 10 kVA.

The use of a two-position switch in the rectifying thyristor circuits provides a full load of rectifying thyristors in current at both stages of the charge.

Since the discharge pulses of short duration current are almost an order of magnitude less than the average value, the installed power of the discharge inverter thyristors is insignificant compared to the installed power of the rectifying thyristors.

The listed advantages of the written scheme determine the preference of its application when the currents of both levels of AB charge are commensurate.

Claims (3)

Invention Formula A device for charging a battery containing a three-phase transformer with two secondary half windings, rectifying and inverting thyristors, a three-pole two-position switch and a throttle shunted by a key element, so as to reduce the installed power of the equipment and increase efficiency , counter-parallel pairs of rectifying and invertor thyristors are connected directly, and additional powerful thyristors through a three-pole switch between adjacent in phase by the ends of the secondary semi-windings of the transformer, the beginnings of which are connected via a choke to the output terminals of the device. Sources of information taken into account in the examination 1. US Patent No. 3938019, cl. H 02 J 7 / III, 1976. 2. Zorokhovich, A.E., et al. Devices for charging and discharging batteries, M., Energia, 975, p. 181-186. 3. USSR author's certificate for application no. 2610170/07, 03.05.78, according to which a positive decision was made.