An Integrated 3-mW 120/230-V AC Mains Micropower Supply
- authored by
- Daniel Lutz, Peter Renz, Bernhard Wicht
- Abstract
The maintenance issue of batteries and the limited power level of energy harvesting is addressed by the presented integrated micropower supply. Connected to the 120/230- VRMS mains, it provides a 3.3-V ac output voltage, suitable for applications such as the Internet-of-Things and smart homes. The micropower supply consists of a fully integrated ac-dc and dc-dc converter with one external low-voltage surface mount device buffer capacitor, resulting in an extremely compact size. Fabricated in a low-cost 0.35- μm700 -V complimentary metal-oxide-semiconductor technology, it covers a die size of 7.7 mm2. The ac-dc converter is a direct coupled, full-wave rectifier with a subsequent series regulator. The dc-dc stage is a fully integrated capacitive 4:1 converter with up to 17-V input and 47.4% peak efficiency. The power supply comprises several high-voltage control circuits including level shifters and various types of charge pumps (CPs). A source-supplied CP is utilized that supports a varying switching node potential. The overall losses are discussed and optimized, including flying capacitor bottom-plate losses. The power supply achieves an output power of 3 mW, resulting in a power density of 390 μWmm2. This exceeds prior art by a factor of 11.
- Organisation(s)
-
Institute of Microelectronic Systems
- External Organisation(s)
-
Reutlingen University
- Type
- Article
- Journal
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- Volume
- 6
- Pages
- 581-591
- No. of pages
- 11
- ISSN
- 2168-6777
- Publication date
- 06.2018
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Energy Engineering and Power Technology, Electrical and Electronic Engineering
- Electronic version(s)
-
https://doi.org/10.1109/jestpe.2018.2798504 (Access:
Closed)
