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Micro-electronic power supply for electrochromic eyewear

  • US 5,900,720 A
  • Filed: 10/02/1997
  • Issued: 05/04/1999
  • Est. Priority Date: 09/10/1993
  • Status: Expired due to Fees
First Claim
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1. A lens driver for supplying power to electrochromic eyewear including a frame and one or more lenses and lens transmissivity-switching means, the lens driver comprising:

  • one or more batteries contained within such frame of the electrochromic eyewear, anda switching power converter operatively coupled with said one or more batteries, said converter being contained also within such frame, said converter including full-bridge configured output transistors providing bidirectional current flow and low voltage drop in either direction, the converter further including an output filter for producing a smooth output voltage waveform to charge the one or more lenses to a determined voltage level representing a desired visible light-transmissivity,whereby said lens driver including said one or more batteries coupled with said switching power converter supplies power to the electrochromic eyewear without external recharging for approximately two thousand cycles of such lens-transmissivity switching means.

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