Device for determining the state of charge in batteries

  • US 3,969,667 A
  • Filed: 12/20/1974
  • Issued: 07/13/1976
  • Est. Priority Date: 08/23/1972
  • Status: Expired due to Term
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First Claim
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1. A device for determining the state of charge in an electrochemical system said system comprising in combination:

  • a. power measuring means connected to said electrochemical system having an output voltage proportional to the power output of said electrochemical system,b. peak read and hold circuit means connected to said power measuring means and providing a first output that is proportional to the output voltage of said power measuring means and a second output that is proportional to the error signal of said peak read and hold circuit,c. power indicating means connected to the first output of said peak read and hold circuit means,d. a current control means coupled to said electrochemical system for controlling the current flow from said electrochemical system to increase in a linear manner;

    e. a means for generating a ramp function signal coupled to said current control means for controlling said current control means in a linear manner.f. track and hold circuit means coupled to said electrochemical system for providing an output voltage proportional to the output voltage of said electrochemical system,g. voltage indicating means connected to the output of said track and hold circuit means,h. first control means coupled between said current control means and said ramp function signal generating means and having an input connected to said second output of said peak read and hold circuit means for disconnecting said ramp function signal generating means from said current control means in response to a predetermined value of said error signal,i. second control means coupled between said track and hold circuit means and said electrochemical system and having an input connected to said second output of said peak read and hold circuit means for disconnecting said track and hold circuit means for said electrochemical system in response to said predetermined value of said error signal.

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