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Charger for Motor Vehicle Storage Battery (the 3rd)

2015-03-16 02:02  
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Work of the circuit The circuit consists of power circuit, pulse oscillator and charging controlling circuit. (It is showed in picture 7-148.) Power circuit consists of power transformer T, the normally closed contacts K2 relay, normally open contacts of relay Kl, bridge rectifier, URl, UR2, voltage regulator diode VS, capacitor CO, Cl, resistors RO, Rl, fuse FUl, indicating light HL and ammeter PA. Pulse oscillator consists of time-base integrated circuit IC, potentiometer RPl and related peripheral components. Charging controlling circuit consists of thyristor VT, relay K2, potentiometer RP2 and peripheral components. 220V AC voltage is adjusted and produces +12V voltage. It works as the working voltage of the pulse oscillator. When the OSC is working, the pulse of IC controls the working condition of relay K1. When the pulse OSC outputs low electrical level, GB is charged. At the same time, the light HL is lightened. When the pulse OSC outputs high electrical level, GB is not charged. And the light HL stops shining. When GB is not fully charged, the indicating light VL does not shine. But when GB is fully charged, VL shines to show that charging is done.