Telephone switchboard and electronic device for providing power to load having different resistance values at different operation modes
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jan 31, 2013
app pub date -
Oct 28, 2011
filing date -
Jul 29, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A telephone switchboard provides various operating voltages to a telephone in different operation modes. The telephone switchboard includes a control unit, an output control circuit and a voltage converter. The control unit detects the operation mode of a telephone and generates control signals to the output control unit. The output control unit controls direction of current flowing through the telephone according to the control signal, and generates a feedback signal according to any change in the operation mode of the telephone. The voltage converter receives the feedback signal and converts the received power to a suitable output operation voltage according to the feedback signal. The telephone switchboard is capable of providing various operation voltages to the telephone in the different operation modes.
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