This paper presents an energy harvesting strategy called Short Circuit Synchronous Electric Charge Extraction (SC-SECE), which is an improvement of the SECE strategy for highly coupled piezoelectric generators. The SC-SECE strategy is based on the control of a short-circuit through two tuning parameters. The first one, , represents the phase between the displacement extrema and the energy harvesting event. The second, , is the angle difference between the beginning and end of the short-circuit

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... hase. The performance of this strategy has been compared to other interfaces such as the SECE and the capacitance tuning approach. However, with the SC-SECE strategy, both the power and bandwidth are greatly improved. Experimental measurements have been performed on a highly-coupled piezoelectric harvester (k m 2 =0.48) which provides a maximal harvestable power P lim of 6µW under an extremely low vibration amplitude (0.03G). We have been able to harvest more than 50% of this P lim over a large frequency band, from 90Hz to 140Hz. These results demonstrate the excellent potential of this strategy for extending the bandwidth of piezoelectric vibration energy harvesters.