%D 2011 %R 10.1109/NatPC.2011.6136419 %O cited By 12; Conference of 3rd National Postgraduate Conference - Energy and Sustainability: Exploring the Innovative Minds, NPC 2011 ; Conference Date: 19 September 2011 Through 20 September 2011; Conference Code:88531 %J 2011 National Postgraduate Conference - Energy and Sustainability: Exploring the Innovative Minds, NPC 2011 %L scholars1573 %X Vibration energy harvesting has got much research interest in recent years as non-exhaustive power source of wireless sensor nodes and wearable electronics. In case of wearable electronics and body sensor network the frequency of vibration produced by human passive motion is as low as 1-10Hz. At such a low vibration frequency harvestable power reduces dramatically, leading researchers to suggest mechanical frequency up-conversion techniques. This paper presents challenges in energy harvesting at low frequencies and overviews the frequency up-conversion techniques suggested in literature. © 2011 IEEE. %K Frequency up-conversion; Low frequency; Low vibration; Low-frequency environment; Mechanical frequency; Passive motion; Power MEMS; Power sources; Vibration energy harvesting; Wearable electronics; Wireless sensor; Wireless sensor node, Body sensor networks; Electric network synthesis; Frequency converters; Sustainable development; Vibrations (mechanical), Energy harvesting %C Perak %T Energy harvesting in a low frequency environment %A K. Ashraf %A M.H.M. Khir %A J.O. Dennis