Alcatel Lucent

Michael W Parrell

John Stephan Gryba

Simon P Whittam

Methods for reducing power dissipation from an input power source in a telecommunications system are disclosed. In one embodiment the method includes: utilizing a first I2C device to monitor an input voltage and input current to a remote unit; providing the input voltage and input current to a main microprocessor for calculating an input power; utilizing a second I2C device to monitor an output voltage and output current from the remote unit; providing the output voltage and output current to the main microprocessor for calculating an output power; calculating a power efficiency of the remote unit at the main microprocessor based on the input power and the output power; utilizing a third I2C device to provide the power efficiency of the remote unit to a digital power manager; and utilizing the digital power manager to control the DA trim output to a DC/DC converter.

Closed-loop efficiency modulation for use in network powered applications

A method and a remote device such as a sealed expansion module (SEM) for reducing power dissipation from an input power source in a telecommunications system are disclosed. A SEM contains a network feed monitor that receives an input voltage and current on twisted wire pair cables. The input voltage is then transmitted to a DC/DC converter and the voltage is adjusted and then transmitted to a BUS feed monitor connected to an active load. A first I2C device is connected to the network feed monitor to provide information related to input voltage and current to a main microprocessor that calculates input power. A second I2C device is connected to the BUS feed monitor and the active load to provide information related to the output voltage and output current to the main microprocessor that calculates output power. The main microprocessor is further connected through a third I2C device to a digital power manager that provides a DAC trim output to the DC/DC converter for optimizing the efficiency of the system.

A system and method for closed-loop efficiency modulation for an AC/DC power system is provided. A boost-buck converter and a DC/DC converter connected in series receive a rectified DC feed signal from a AC input signal and deliver a modified DC output to an active load. A controller receives power data at various stages of the system and uses that data to modify a series of trim voltages provided to the feedback inputs of the respective converters to modify each converters output voltage. The controller modifies each converter's output voltage to maximize power efficiency while monitoring other data in the system to ensure the system is operating correctly and safely.

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Stittsville, Canada

Michael W Parrell