IP telephone with power source circuit
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United States of America Patent
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Jul 18, 2006
Grant Date -
Aug 29, 2002
app pub date -
Feb 25, 2002
filing date -
Feb 26, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An IP telephone has a power source circuit. A direct current from a network is used to charge an input capacitor via an input current limiting resistor. A resultantly charged voltage is inputted to and is converted by a DC/DC converter to produce an output voltage. In parallel with the input current limiting resistor, a limit removing unit including a switching transistor is arranged. The output voltage is delayed by a delay circuit to activate a driving transistor, which drives the switching transistor. The input voltage to the converter is monitored by an input voltage sensor. Therefore, the telephone power source circuit copes with a plurality of hubs of different power supplying specifications in an internet (IP) telephone network in which telephones are connected to a local-area network of the IEEE802.3 standard and the like.
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