As with the current‐controlled automatic boost system, Dynamic Boost includes no pre‐programmed boost timer. Unlike the current‐controlled automatic boost system, however, Dynamic Boost automatically adjusts boost duration to take into account differing parasitic DC loads and other variables discussed above.

The principle behind Dynamic Boost is simple and straightforward. Refer back to Figure 1. For each and every recharge cycle, Dynamic Boost measures how long the charger operates in current limit (Phase 1), and retains this information in its memory. Once the charger transitions from Phase 1 to Phase 2, the charger maintains boost voltage for a ratio of the time that it remembers operating in Phase 1. In other words, the longer the charger operates in Phase 1, the longer it operates in Phase 2, before reverting to float voltage (Phase 3).

The following examples illustrate how Dynamic Boost adapts to changing conditions:

• When a battery is only partially discharged the transition from Phase 2 to Phase 3 should occur sooner than would be optimal if the battery were fully discharged beforehand. This is because fewer ampere‐ hours need to be returned to a partially discharged battery than a fully discharged one. Dynamic Boost recognizes and adapts to a more shallowly discharged battery because the duration of Phase 1 of a shallowly discharged battery will naturally be shorter than with a battery that had been fully discharged. Dynamic Boost measures the relatively shorter duration of Phase 1 and shortens Phase 2 accordingly.

• When DC loads are attached in parallel to a given battery and charger, and the battery must be recharged, the duration of both Phases 1 and 2 must become longer than if there were no attached load. This is because the DC loads are consuming some of the charger’s capacity, leaving less capacity to charge the battery. The time to achieve full recharge must therefore increase. Dynamic Boost recognizes and adapts to the DC load because it measures an increase in the duration of Phase 1. This causes the charger to lengthen the duration of Phase 2.

Because most modern systems experience variation of both the connected DC loads current and battery depth of discharge, it should be clear that chargers equipped with Dynamic Boost deliver more accurate real‐world charging results than earlier generation chargers. “More accurate charging” means faster charging with lower risk of overcharge for every recharge cycle.

The benefits of more accurate charging enabled by Dynamic Boost include a more reliable battery‐backed application, reduced need for battery maintenance, lower risk of premature battery failure, longer battery life and lower costs.

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