Charging with prevention. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Charging with prevention. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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During the operation of acid batteries, sulphation of the plates gradually occurs, leading to a decrease in capacity and a reduction in the service life of the device. A special rectifier will help eliminate this undesirable phenomenon. The device is intended for use in stationary and field car repair shops. You can assemble it with a driver who has basic knowledge of electrical engineering and electronics.

The principle of operation of the device is based on charging the battery with a pulsed current with a cutoff of 60 ° at a ratio of charging current to discharge current of 10:1. In other words, the chemical power source is alternately first charged with the rated charging current, and then discharged with a current 10 times smaller in strength. In this mode, lead sulfate is effectively removed from the battery plates, as a result, their service life is increased by 25%.

Charging with prevention
Schematic diagram of the charger

The battery desulfation rectifier (see figure) is made on semiconductor devices and is designed for two operating voltages: 6 V and 12 V. In the position of the toggle switch S2, shown in the circuit diagram, the device serves to charge a 12-volt battery.

After rectification by diode V1, the negative half-wave of alternating current enters the collector of the regulating transistor V4. In the circuit of its base, two reference zener diodes V2, V2 and a variable resistor RXNUMX are included. With it, set the optimal battery charge mode.

Power transformer T1 is made on the core Ш20Х30. Winding I contains 1700 turns of PEV 0,27 wire, the secondary consists of 110 + 164 turns of PEV 0,51 wire, and winding III has 50 turns of PEV 0,27.

Transistor V5 is mounted on a heatsink with a usable dissipation area of 50 cm2.

Author: E. Dryuchin

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