Patent ID: 7692469

Claim:
A voltage sense circuit comprising: a voltage input terminal; a voltage return terminal; a first input and a second input coupled to receive an ac input signal; a first current mirror coupled to the first input to convert the ac input signal to a first current that is representative of the ac input signal, the first current mirror including a first transistor having a first current carrying electrode and a control electrode coupled to the first input, and a second current carrying electrode coupled to the voltage return terminal and the first current mirror also including a second transistor having a first current carrying electrode coupled to the second current carrying electrode of the first transistor, a control electrode coupled to the control electrode of the first transistor, and a second current carrying electrode; a second current mirror coupled to the second input to convert the ac input signal to a second current that is representative of the ac input signal; a summing node coupled to sum the first current with the second current and form a third current; a rectifier coupled to receive the third current and form a rectified current that is representative of the ac input signal; and an output of the voltage sense circuit configured to convert the rectified current to a rectified voltage that is representative of the ac input signal.