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An ultra-low power capacitance extrema and ratio detector for electrostatic energy harvesters

  • The power supply is one of the major challenges for applications like internet of things IoTs and smart home. The maintenance issue of batteries and the limited power level of energy harvesting is addressed by the integrated micro power supply presented in this paper. Connected to the 120/230 Vrms mains, which is one of the most reliable energy sources and anywhere indoor available, it provides a 3.3V DC output voltage. The micro power supply consists of a fully integrated ACDC and DCDC converter with one external low voltage SMD buffer capacitor. The micro power supply is fabricated in a low cost 0.35 μm 700 V CMOS technology and covers a die size of 7.7 mm2. The use of only one external low voltage SMD capacitor, results in an extremely compact form factor. The ACDC is a direct coupled, full wave rectifier with a subsequent bipolar shunt regulator, which provides an output voltage around 17 V. The DCDC stage is a fully integrated 4:1 SC DCDC converter with an input voltage as high as 17 V and a peak efficiency of 45 %. The power supply achieves an overall output power of 3 mW, resulting in a power density of 390 μW/mm2. This exceeds prior art by a factor of 11.

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Author of HS ReutlingenHennig, Eckhard
Erschienen in:ESSCIRC 2015 - 41st European Solid State Circuits Conference (ESSCIRC) : 14 - 18 Sept. 2015, Graz, Austria
Place of publication:Piscataway, NJ
Editor:Wolfgang Pribyl
Document Type:Conference proceeding
Publication year:2015
Tag:capacitance extrema detector; electrostatic energy harvesting; low-power CMOS integrated circuit
Page Number:4
First Page:245
Last Page:248
DDC classes:621 Angewandte Physik
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt