Diagram of a desulphating charger. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Batteries, chargers
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The scheme of the desulfating charger was proposed by Samundzhi and L. Simeonov.
The charger is made on the basis of a half-wave rectifier on diode VI with parametric voltage stabilization (V2) and a current amplifier (V3, V4). Signal lamp H1 lights up when the transformer is connected to the network. The average charging current of about 1,8 A is regulated by the selection of resistor R3. The discharge current is set by the resistor R1. The voltage on the secondary winding of the transformer is 21 V (peak value 28 V). The voltage on the battery at the rated charging current is 14 V. Therefore, the charging current of the battery occurs only when the amplitude of the output voltage of the current amplifier exceeds the battery voltage. During one period of alternating voltage, one impulse of the charging current is formed during the time Ti. The battery discharge occurs during the time Tz= 2Ti. Therefore, the ammeter shows the average value of the charging current, which is approximately one third of the amplitude value of the total charging and discharging currents.
In the charger, you can use the transformer TC-200 from the TV. The secondary windings from both coils of the transformer are removed and a new winding is wound with a PEV-2 1,5 mm wire, consisting of 74 turns (37 turns on each coil). Transistor V4 is mounted on a radiator with an effective surface area of about 200 cmXNUMX.
Details
Type VI diodes D242A. D243A, D245A. D305, V2 one or two zener diodes connected in series D814A, V5 type D226: transistors V3 type KT803A, V4 type KT803A or KT808A.
When setting up the charger, you should select the voltage based on transistor V3. This voltage is taken from the potentiometer slider (470 ohms) connected in parallel with the zener diode V2. In this case, the resistor R2 is chosen with a resistance of about 500 ohms. By moving the potentiometer slider, it is achieved that the average value of the charging current varies by 1,8 A.
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