Switching Battery has developed a novel patent-pending electronic battery connection method for rechargeable batteries, called the Para-series method. This method is based on dynamically switching a group of batteries between series and parallel connection. As these two connection schemes have complementary properties, the Para-series method can yield the optimal result for the output voltage.
This method is vastly superior to the usual mechanical switches, and offers advantages even in comparison with the standard DC-DC converters. The most important Para-series characteristics are:
the output voltage can be continuously changed in a wide range by simply adjusting the duty cycle of the switching signal;
- A single switching frequency is used, that can be as low as the usual 50/60Hz line frequency. This strongly reduces the electromagnetic interferences (EMI) and the need to comply with EMI regulations;
- The State of Charge of the system batteries is automatically rebalanced and the remaining charge redistributed among the batteries. A weak battery is constantly recharged by the other ones, thus avoiding a general failure due to a single battery. This rebalancing acts from the very start, before any charge unbalance can develop and put the system to a risk.
- Batteries of different sizes can be employed in the same system, giving great flexibility in the battery pack design.