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Configuration Method and Apparatus of Bidirectional Switched-Capacitor Converters

Configuration Method and Apparatus of Bidirectional Switched-Capacitor Converters

Key Problem and Market Opportunity

  • The existing commercial power supplies are mainly inductor-based converters. Those converters are usually heavy, bulky and low power density due to the inductor-based (magnetic) elements. They are also unsuitable for high-temperature environment.
  • Magnetic-less switch-capacitor converters are conventionally in high complexity, and high switch’s and capacitor’s stress.
  • The global DC-DC converters market was valued at US$3.46 Billion in 2016 by MarketsandMarkets1


Key Advantages of the Technology

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  • Novel family of switched-capacitor (SC) converter composed of basic modules. (Fig 1)
  • A bidirectional SC converters with high-gain ratio of any positive integer
  • Conversion ratio being flexible means suitable for many applications
  • The input and output of the proposed converters are of common ground
  • Lower number of switches and capacitors and lower switch's and capacitor's stress
  • Easy control and Simple driver circuits
  • The efficiency of a nine-time SC converter prototype (Fig 2), operating at 20-V input voltage and 100-W output, is higher than 98%  (without driver's loss) or 95.5% (including the driver's loss) over the entire load range between 25 and 100 W. (Fig 3)
  • The output voltage ripple is less than 1%.

Potential Product and Services

  • Highly efficient, Light-weight and compact DC-DC power converters.
  • For example, battery applications for distributed renewable energy resources

Development Status and IP Strength

  • EP (PCT) Application No. 15882965.5 
  • US (PCT) Application No. 15/546,574 
  • PRC (PCT) Application No. 201580076950.5 
  • Device prototype is available in laboratory scale

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