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Battery charger capable of displaying necessary charging time

  • US 5,726,555 A
  • Filed: 02/28/1996
  • Issued: 03/10/1998
  • Est. Priority Date: 02/28/1995
  • Status: Expired due to Fees
First Claim
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1. A battery charger for use in charging a secondary battery which has two terminals, said battery charger having a current supplying circuit for supplying a predetermined current between said two terminals, a voltage supplying circuit for supplying a predetermined voltage between said two terminals, said battery charger comprising:

  • a memory for memorizing charging voltage and charging current characteristics of said secondary battery,a voltage detecting circuit for detecting a charging voltage between said two terminals to produce a detected voltage signal which is representative of said charging voltage,a current detecting circuit for detecting a charging current between said two terminals to produce a detected current signal which is representative of said charging current,a control circuit connected to said memory, said voltage detecting circuit, and said current detecting circuit for deciding a necessary charging time on the basis of said charging voltage and charging current characteristics, said detected voltage signal, and said detected current signal, anda display unit connected to said control circuit for displaying said necessary charging time.

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