SU1654920A1 - Device for charging storage battery with asymmetrical current - Google Patents

Abstract

This invention relates to elect. trochemical current sources - batteries, in particular, to charge systems with asymmetric currents from a three-phase AC source, the windings of which are connected in a series cell or a star with an extracted neutral. The purpose of the invention is to improve the specific energy indices by increasing the rate of energy transfer of the source to the battery being charged. This is achieved by the fact that, in a charge device with a bridge rectifier — an asymmetric current driver, the two arms of which are formed by thyristors, and the other two by charge-discharge capacitors, the thyristors connected in the cross-arms additionally introduced diode. When the windings of the three-phase AC source are connected by a star, two thyristor-capacitor cells, two capacitors and two diodes are also introduced into the charging device, forming three-phase rectifier-shapers of asymmetric current. With this formation of the asymmetric current, the voltage at the output of the charging device is doubled, which provides a large range of control of the constant component of the asymmetric current. 1 il. (L with

Description

The invention relates to electrochemical current sources - batteries, in particular, to systems for their charge with an asymmetric current.

The aim of the invention is to improve the specific energy indicators by increasing the rate of energy transfer of the source to the battery being charged.

The drawing shows an electrical diagram of a device for charging a battery with an asymmetric current.

The device contains three phase windings 1-3 of a three-phase alternating current source (TIPT) connected in a series cell, two of which are connected according to and opposite to the third and through a current limiting capacitor (TC) 4 this cell is connected to the terminals of the input diagonal of the controlled bridge rectifier asymmetric current generator. The two cross-shoulders of this bridge form charge-discharge capacitors (ADMS) 5 and 6, and the other two are controlled Tiris

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the tori 7 and 8, which are connected by a diode 9 connected in series with it. The positive and negative output buses of this bridge are connected to a charged battery (AB) 10, the magnitude of the charging current of which is controlled by the thyristors, the opening signals of which are supplied from the unit 11, which controls the voltage of the battery and the source and the phase control of the thyristors. The capacitance of the current-limiting capacitor 4 exceeds the capacity of the AMS 5 and 6 by no less than ten times.

The device works as follows.

In the half-period, changes in the instantaneous value of the EMF of the cell of windings 1–3 will be called odd when the voltage of winding 1 is positive and winding 3 is negative, and TC 4 is charged through diode 9. The potential of the capacitor 4 is positive. After the maximum is reached, the cell voltage decreases in absolute magnitude, and diode 9 is in. locked up

state, since a positive potential (relative to the anode) is applied to its cathode.

When the voltage of the winding cell decreases, the thyristors 7 and 8 are opened and the ADMS 5 and 6 are charged, and then the battery 10 under the action of the total voltage of the circuit from TC 4 and the cell from windings 1–3. The cell voltage at the same time decreases first to zero, and then (in the next half-period, even) increases in absolute value. The capacitor 4 is first discharged and then recharged, giving energy to the AB and SAM.

The recharging process is completed in the middle of an even half-period when the voltage of the cell of the phase windings reaches its amplitude value. After that, the cell voltage begins to decrease in absolute value, the thyristors are closed (in the natural self-suppression mode), the voltage of the AMS 5 and 6 is equal to the AB voltage, and the voltage of the TC 4 is the difference of the voltage amplitude of the cell and the charged battery 10. In this moment there is an abrupt change in the structure of the system: SA-N-6, AB-10 and

five

. The CRC 5 is turned on via an input bridge diagonal in series with each other.

At the time of the structure change, when the thyristors are extinguished, and the source voltage. It begins to decrease in absolute value, AB 10 is charged by the circuit: AB 10 - ADMS 5 - TC 4 - source - ADMS 6 - AB. The capacitor 4 at the same time continues to recharge.

Diode 9 is in the closed state until the decreasing source voltage becomes equal to the growing voltage TC 4. Starting from this point in time, the structure of the charging system changes as the diode 9 opens and TC 4 re-starts discharging it to press. The discharge TK stops at the end of the second half period. After that, the odd half cycle begins again, the TIPT voltage starts to increase again, while the AMS 5 and 6 begin to return their energy to the AB, and TC 4 is recharged in the original polarity.

Since the BA charge current is limited by the capacitance of TC 4, the external volt-ampere characteristic of the system is linear, the losses in the system are indefinite.

Introduction to the system of Cyode 9, twice during the period of changing the structure of the charging device 5, provides a charge from the source, which increases the rate of energy transfer to the AB.

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Claims (1)

Invention Formula A device for charging a battery with an asymmetric current, containing a three-phase AC source, controlled by a bridge rectifier-driver of an asymmetric current, the two opposite arms of which are formed by thyristors and the other by charge-discharge capacitors, to the terminals of the input diagonal through a current-limiting capacitor A cell is connected from the series-connected windings of the AC source, two of which are interconnected according to and opposite to the third winding, and control voltages, characterized in that, in order to improve the specific energy parameters by increasing the rate of energy source in a charged secondary battery, the apparatus is further provided with a diode connected in series, according to between the thyristors of the bridge rectifier-maker of the asymmetric current, and the capacity of the current-limiting capacitor is at least 10 times greater than the capacity of the charge of the discharge-discharge capacitors. about +