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Electronic device, battery pack and charger for the battery pack

  • US 5,627,449 A
  • Filed: 08/17/1994
  • Issued: 05/06/1997
  • Est. Priority Date: 08/30/1993
  • Status: Expired due to Term
First Claim
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1. An electronic device having terminals connected to those of any of a plurality of battery packs of different specifications when selectively attached to a main body of said electronic device, thereby allowing output of a battery incorporated in the attached battery pack as a supply voltage to said main body of said electronic device, and switching of an operation mode in accordance with a type of the attached battery pack,said electronic device (21) and each of the battery packs (22) having specification-discriminating terminals (TL, TJ) which are connected when said electronic device and the battery pack are connected together;

  • each of said battery packs (22) having a regulator (222) for generating a regulated voltage from an output voltage of the incorporated battery (221) and a first monitor resistor (224) connected between an output terminal of said regulator (222) and said specification-discriminating terminal (TJ) thereof and having a resistance corresponding to said specification of said incorporated battery (221); and

    said main body (21) having a second monitor resistor (214) connected between said specification-discriminating terminal (TL) thereof and ground, the output voltage of the regulator (222) in said battery pack (22) being divided by the first and Second monitor resistors (214,

         224), monitor voltage detecting means (215) for detecting a monitor voltage generated across said second monitor resistor (214), specification discriminating means (212,

         216) for discriminating said specification of said incorporated battery of said attached battery pack (22) from said monitor voltage detected by said monitor voltage detecting means (215), and operation mode switching means (212,

         219) for switching said operation mode in accordance with said specification discriminated by said specification discriminating means (212,

         216).

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