Normalized (pulse-) charging

The current from battery chargers with 'medium' ripple attenuated by leakage-field-transformers (LTs) is analyzed. LTs are wound with primary and secondary windings spaced apart on a bobbin with 2 chambers. Type UI-cores have a higher leakage inductance L/sub s/ than EI-cores, and L/sub s/ may be increased 100% by reversing one bobbin (and by using different number of turns per volt). LTs are controlled by triacs or thyristors. Their line current is 'softer' and their voltage droop is higher than usual. At the end of charging their current ripple is of the same magnitude as an ordinary rectifier with a filter choke.<
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