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Supplying a charging current by way of telephone lines or the like

  • US 3,870,822 A
  • Filed: 02/14/1972
  • Issued: 03/11/1975
  • Est. Priority Date: 02/16/1971
  • Status: Expired due to Term
First Claim
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1. A power supply system for supplying current from an electrical direct current power source to an auxiliary load at a remote location by way of a telecommunication transmission line, said system including a power transmit unit and a line power receiver unit situated at the location remote from the transmit unit;

  • said transmit unit including first means to sense the state of communication and to connect, and to disconnect, the power source to, and from, the line, when the line is idle, and busy, respectively, said connection being made at the end of a first predetermined time interval from the line becoming idle, and said disconnection being made when the line is busied; and

    , said receiver unit including second means to sense the idle, and busy state of communication, and arranged to connect the load to the line when the line is idle and to cause the current from the power source to flow at the end of a second predetermined time interval from the line becoming idle, and said second means being arranged to disconnect the load from the line when the line is busied and required as a telecommunication lInk.

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