Patent ID: 6597075
Filing Date: 2003-07-22
Classification: H02J,H02M

Abstract:
A power supply comprising:a first AC power converter having an input for connection to an AC power grid and at least one rectifier for producing a first DC voltage at its output; an isolation transformer having a primary winding connected to said first DC voltage and having a secondary winding; a second AC power converter having an input connected to the secondary winding and at least one rectifier for providing a second DC voltage at an output; a voltage controller having a voltage control input, a battery connected to the output of said second AC power converter, a temperature sensing device located near the battery, and a low power voltage comparator having an input connected to the output of said second AC power converter through a voltage divider including the temperature sensing device and having an output coupled to the voltage controller voltage control input, said battery and the output of said second AC power converter connected to a DC power bus in a backplane in a customer premises telecommunications hub.