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Charging and discharging circuit

  • US 4,458,111 A
  • Filed: 01/21/1982
  • Issued: 07/03/1984
  • Est. Priority Date: 01/23/1981
  • Status: Expired due to Fees
First Claim
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1. A charge-discharge switching circuit for use in a cordless telephone including a base unit and a handset, wherein the base unit comprises a charger having an output and a pair of first charging electrodes respectively connected to said output, and wherein the handset is removably mounted to the base unit and has a transmitter/receiver for wireless communicating with the base unit, a rechargeable storage battery, and a pair of second charging electrodes which are brought into contact with the pair of first charging electrodes respectively when the handset is placed on the base unit, characterized in that the charge-discharge switching circuit is provided in the handset, said circuit being operative in response to the output signal of the charger to separate the battery from the transmitter/receiver for charging the storage battery when the handset is placed on the base unit and to connect the storage battery to the transmitter/receiver for supplying electrical power for the transmitter/receiver when the handset is separated from the base unit.

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