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Single TOP223 series switching power supply circuit

Published on Mar 17 2011 // Electrical Circuits

This article describes the following simple 24V battery charger can automatically charge the battery, the maximum charge current up to 2.5A, and has a constant current charging and full of self-stop function.
Figure 4-9 Circuit Diagram for automatic charger. 220V, T Buck received by the transformer secondary voltage U2, the format by VD1 ~ VD4 pulse rectifier output DC voltage, the positive A normally closed contact point through the relay K1-2, R4, ammeter PA, VT1, through the battery GB , VT2 B points to the negative charging of the GB, adjust the size of RP1, which adjust the VT1, VT2 of the base potential, thereby regulating VT2’s Icb, the charge current size. Since the battery charging voltage to reflect the situation, so the nominal voltage of 12V battery, for example, when the battery voltage up to (12 / 2) * 2.5 = 15V when, VT3 saturated conduction, K1 energized pull, often closed contact K1-2 off, cut off the charging circuit, the charger stops charging. Regulation RP2, can set the battery is full the upper limit from the stop.

Single TOP223 series switching power supply circuit 1

 Single TOP223 series switching power supply circuit 2

Single TOP223 series switching power supply circuit 3