SU1283896A1 - Device for charging storage battery - Google Patents

Abstract

The invention relates to the electrical industry, in particular to devices for charging alkaline and acid batteries. The purpose of the invention is to simplify the control circuit of the charging device. When the battery is connected via a full-wave thyristor rectifier to the secondary winding of the step-down transformer, the battery begins to charge if its electromotive EMF is less than the reference voltage of the protection unit 12. As the battery charges, its emf increases. If by the time of the beginning of the half-cycle the supply voltage of the EMF AB is greater than the reference voltage, the rectifier thyristors switch later - in the middle of the half-wave, at its end or not at all. Thus, the AB is charged with a constant pulsating current. 1 il. a (lc

Description

The invention relates to a device for charging a battery, disconnecting it automatically at the end of a charge, and can be used for alkaline and acid batteries.

The purpose of the invention is to simplify the control circuit of the charging device. The drawing shows a circuit diagram of the proposed device.

The device contains a step-down Transformer 1, the primary winding 2 of which, when charging the battery 3, is connected to the AC mains, and the secondary winding 4 and 5 with the middle lead is connected to a two-wave rectifier on two thyristors .6 and 7. In the circuit of control electrodes - the thyristor cathodes through diodes 8 and 9 and the resistor 10 are turned on the optoelectronic device 11 and the overcharge protection block 12. The rectified voltage from the secondary windings 4 and 5 of transformer 1 through thyristors 6 and 7 is applied to the terminals of the battery 3.

The device works as follows.

When transformer 1 is connected to the supply circuit, the voltage signs on the cathodes of thyristors 6 and 7 change twice during the period. As long as the electromotive force of the battery 3 is less than the reference voltage of the protection unit 12, the transistor 13 is open in each working half-period and the emitter-collector and resistor 14 are energized on the LED of the optocoupler 11, the thyristor of the optocoupler 11 opens, the voltage from the average The output of the secondary winding 4 and 5 of transformer 1 through the resistor 10 and the diodes 8 and 9 is supplied to the control electrodes of the thyristors 6 and 7.

When the polarity of the supply voltage on the secondary winding 4 and 5 of the transformer 1 minus on the upper part of the winding 4 and plus on its lower output (i.e. at the middle of the winding 4 and 5), the thyristor 6 is unlocked along the circuit of the secondary output of the secondary winding 4 and 5, the resistor 10, the thyristor of the optocoupler 11, the diode 8, the upper part of the secondary winding 4 and 5. At this time, to the lower part of the winding 4 and 5, i.e. at the cathode of the thyristor 7 is applied plus voltage, as a result of which the latter for

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covered Through the open thyristor 6, the supply voltage half-period passes to the battery through the circuit: the secondary terminal of the secondary winding 4 and 5, the transformer 1, the battery 3, the thyristor 6, the upper part of the winding 4 and 5. In the next half-period the thyristor 7 opens and closes thyristor 6.

As the battery charges, the electromotive force of the battery increases and becomes more and more constant over time. If by the beginning of the half cycles of the supply voltage the electromotive force of the battery 3 will be greater than the reference voltage, i.e. Since the transistor 13 does not transmit current to the LED of the optocoupler 11 at this moment in time, the thyristors 6 and 7 switch later — in the middle of the half-wave, at its end or not at all. Thus, the battery 3 is charged with a constant pulsating current.

The application of the proposed charger greatly simplifies the control circuit of two thyristors, the circuit of the charger as a whole, increases its switching reliability, simplifies and reduces the cost of manufacture and operation.

Claims (1)

Invention Formula A device for charging a battery, containing output terminals, a transformer, the secondary winding of which is made with a midpoint connected to one of the output terminals, two thyristors, diodes are connected to the control circuits of the cathodes, simplify the device, two resistors are additionally added to it, a thyristor optocoupler, a transistor and a protection unit with a reference voltage, the protection unit being connected to the output terminals of the device with its input, and its output to the emitter-base circuit the torus, the collector circuit of which includes the first resistor and the input of the thyristor optocoupler, the output of which is connected to the anodes of the diodes by one electrode and to the midpoint of the secondary winding of the transformer through another resistor.