Charger-discharge device for a cordless electric drill. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The battery charger for the RTD1808BGS electric drill (18 V, 1,2 Ah), included in its kit, is made according to the simplest scheme and cannot provide normal battery charging. On the LNK501 chip, you can build a device that provides battery charging with direct current when the mains voltage fluctuates over a wide range. It is also useful to supplement it with a timer for the charging time and a discharge circuit that allows the charging process only after the battery is completely discharged, which guarantees the exclusion of the so-called "memory effect" of Ni-Cd batteries.
The scheme of the proposed device is shown in fig. 4.7 and 4.8. The actual dual-mode (current stabilization - voltage stabilization) power supply (Fig. 4.7) is assembled according to the standard scheme and placed in the housing of the D2-37 network adapter. On fig. 4.8 shows a diagram of a timer and a bit circuit.
Rice. 4.7. Cordless Drill Charger Power Supply (click to enlarge)
Rice. 4.8. Timer and discharge circuit (click to enlarge)
The maximum output power of the source on the LNK501 chip in standard inclusion is 4 W, which is somewhat small for fast battery charging.
To obtain the maximum possible output power, it was decided to increase the voltage U0R to 80 V, based on an output power of 5,5 W. Such power provides at a voltage of 23 V (this is the voltage on a fully charged battery at the end of charging in the presence of a charging current plus a drop on an isolating diode and a key transistor) a charging current of 240 mA, sufficient (taking into account the current branch into the timer and the elements of the discharge circuit) for charging batteries for 8 hours.
Author: Shelestov I.P.
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