Rectifiers with electronic regulator for battery charging. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The rectifier (Fig. 1) is assembled using a bridge circuit using four diodes D1 - D4 of type D305. The charging current is regulated. using a powerful transistor T1 connected according to a compound triode circuit. When the bias removed to the base of the triode from potentiometer R1 changes, the resistance of the collector-emitter circuit of the transistor changes. In this case, the charging current can be changed from 25 mA to 6 A with a voltage at the rectifier output from 1,5 to 14 V.
Fig. 1
Resistor R2 at the rectifier output allows you to set the rectifier output voltage when the load is off. The transformer is assembled on a core with a cross section of 6 cm2. The primary winding is designed to be connected to a network with a voltage of 127 V (pins 1-2) or 220 V (1-3) and contains 350+325 turns of PEV 0,35 wire, the secondary winding - 45 turns of PEV 1,5 wire. Transistor T1 is installed on a metal radiator; the surface area of the radiator must be at least 350 cm3. The surface is taken into account on both sides of the plate with a thickness of at least XNUMX mm.
The diagram shown in Fig. 2 differs from the previous one in that in order to increase the maximum current to 10 A, transistors T1 and T2 are connected in parallel. The bias to the bases of the transistors, by changing which the charging current is regulated, is removed from the rectifier made on diodes. D5 - D6. When charging 6-volt batteries, the switch is set to position "1", and 12-volt batteries - to position "2".
Ris.2.
The transformer windings contain the following number of turns: 1a - 328 turns PEV 0,85; 1b - 233 turns PEV 0,63; II - 41+41 turns PEV 1,87; III - 7+7 turns PEV 0,63. Core - УШ35Х 55.
Author: B. Vasiliev
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