Development of a Novel Large Capacity Charger for Aircraft Battery

This paper presents a novel large capacity charger for aircraft battery, which can be used as maintainable equipment for lead-acid and cadmium-nickel batteries. The circuit scheme, control principle, software design, charger failure detection and protection circuit are also designed in detail. The main circuit of the proposed charger uses half-bridge DC-DC converter. The control circuit, which uses voltage and current double closed-loop control, takes the ADμC812 chip with A/D transformation as its core. It can control the charger in a state of constant current or trickle charge. Simultaneously, the battery charger´s soft start circuit, over-current protection circuit, over-temperature protection circuit as well as the polarity detection circuit are also designed. A prototype with ADμC812 is developed, which can control the current of the charger in the state of constant current and trickle charge. Its superiority performance such as electric separation, simple frame, high efficiency, small volume, light weight is verified by experimental results.