期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 6, 期 2, 页码 581-591出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2018.2798504
关键词
ac-dc power converters; charge pumps (CPs); dc-dc power converters; power supplies; switched capacitor (SC) circuits
资金
- Multi Project Chip Group Baden-Wurttemberg
- Federal Ministry of Education and Research Germany [03FH027I3]
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-mu m 700-V complimentary metal-oxide-semiconductor technology, it covers a die size of 7.7 mm(2). 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 mu W/mm(2). This exceeds prior art by a factor of 11.
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