Patent ID: 7139680

Claim:
An apparatus for standby lighting comprising: a standby lamp module having a circuit, said circuit further comprising: a current sensor module for sensing an alternating current from a line voltage supply; a rectification module for converting said alternating current into a direct current; a voltage sensor module for maintaining a constant output voltage by adjusting a switching frequency through sensing an input signal which is proportional to an input line voltage from said line voltage supply; a processor module connectable to said current sensor module, said rectification module, and said voltage sensor module, for generating a switching duty cycle and a frequency to maintain a constant voltage direct current based upon input signals from said current sensor module and said voltage sensor module; a power switching module connectable to said rectification module and to said processor module for outputting said constant voltage direct current; and wherein said power switching module produes said constant voltage direct current from said line voltage supply and not from a battery.