Integrated asynchronous high-voltage DC-DC buck converter for energy harvesting applications

Reported is a high-voltage DC-DC buck converter to interface energy harvesters in ultra-low-power wireless sensing applications. A measured efficiency between 61 and 91- has been obtained for input power between 10 and 1000 -W and for a large input voltage range between 5 and 60 V. To minimise the power consumption of the control circuits, an asynchronous implementation was used with a zero static power high-voltage level shifter and a widely applicable ultra-low-power n-switch control circuit architecture.