A simple charger for the TC-200. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The easiest way to "resuscitate" the battery is charging in training mode, when in one period of the mains voltage the battery is charged with a current 5-10 times lower than the battery capacity, during one half-cycle, and discharged with a current 50-100 times lower than the battery capacity. Usually, after ten hours of this mode, most sulphated batteries return to normal.
The figure shows a diagram of the simplest device that implements this mode.
During the positive half-cycle, an opening voltage appears on the base of the composite transistor, which is set by resistors R1 and R2.
The transistor opens and through it the charging current flows to the battery. The value of this current depends on the degree of opening of VT1, and therefore on the position of the R2 slider.
The charging current flowing through the battery is measured with a PA1 ammeter.
With the transition of the mains voltage through zero, the transistor VT1 closes, and during the negative half-wave of the mains voltage, the battery is discharged through a powerful resistor R3.
Voltmeter PV1 is used to monitor the voltage on the battery.
It must not be allowed to be more than 14 V. If the battery is heavily sulphated, its internal resistance will be high, and even with a small charging current, an increased voltage (16 - 17 V) will drop on it, this should not be allowed, and at the first stage of "resuscitation" you need to set a current with resistor R2 at which the voltage on the battery will not exceed 14-14,5 volts, and then, after 15-30 minutes, gradually increase the current, observing that the voltage does not exceed 14 volts.
At the same time, it is necessary to ensure that the electrolyte does not boil (remove the lids from the jars, and if active bubbling is visible, reduce the current to such a level that it does not exist).
As a basis for the transformer, a TS200 power transformer (it is also possible. TS 180) from tube TVs is used. It is necessary to remove all its secondary windings, then wind new ones - two windings of 40 turns each (on different coils of the transformer). And then connect them in the same way as network windings are connected.
The maximum current that this device produces is up to 15 A, if you need accelerated battery charging, you can set the current to 10 - 12 A.
Author: Shelestov I.P.
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Comments on the article:
Nicholas
When the devices are turned on, they simply burn out for PA1, a shunt is needed, PA2 is an additional resistance. In the program which the author used, it is necessary to correct the Library of Elements.
Victor
I really liked it.
Igor
When assembling the circuit, the input voltage is about 7 volts?
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