Patent ID: 8692477

Claim:
A voltage sensing controller for an asynchronous DC-DC boost converter, said controller adapted to generate a signal to selectively isolate an input power supply to a load, said controller comprising: a circuit having a first node connected to the input power supply and a second node connected to the load; a first voltage divider comprising a first pair of resistors adapted to be connected between said first node and ground and further adapted to generate a sensed input voltage; a second voltage divider comprising a second pair of resistors adapted to be connected between said second node and ground and further adapted to generate a sensed output voltage; an offset voltage generator adapted to receive said sensed input voltage and said sensed output voltage and determine an offset voltage between said sensed input voltage and said sensed output voltage; a reference voltage generator adapted to add said offset voltage to said sensed output voltage and generate a reference voltage; a comparator adapted to compare said sensed input voltage with said reference voltage and generate an output signal having a high state in the event that said reference voltage is less than said sensed input voltage and a low state in the event that said reference voltage is greater than said sensed input voltage; and disabling means adapted to receive said output signal of said comparator and generate a disabling signal to selectively disable said source of input power when said output signal is in said high state.