Patent ID: 8527062

Claim:
A compliance monitoring circuit to monitor and control compliance voltage of an electrode suitable to contact a tissue of a human or animal body, the electrode being connected with an electrode driver, comprising: a connection to the electrode providing an electrode voltage (Ve); a predetermined reference voltage at a desired voltage level (Vr); a switching signal Vs; a predetermined threshold voltage (Vt) chosen to be a maximum voltage variation; an array of MOSFET transistors including: a first MOSFET transistor having a source connected to the electrode therefore having the voltage Ve, a gate connected to the switching signal Vs and a drain having a voltage Vds; a second MOSFET transistor having a source connected to the reference voltage Vr, a gate connected to the switching signal Vs and, a drain; a third MOSFET transistor having a source connected to the predetermined threshold voltage Vt, a gate and a drain, wherein the gate of the third MOSFET is electrically coupled to the drain of the third MOSFET and the drain of the second MOSFET therefore providing a voltage Vgs on the gate of the third MOSFET, the drain of the third MOSFET and the drain of the second MOSFET; and a fourth MOSFET transistor having a source connected to the predetermined threshold voltage Vt, a gate electrically coupled to the gate of the third MOSFET therefore containing the voltage Vgs; and a drain that is electrically coupled to the drain of the first MOSFET, therefore containing the drain voltage Vds; and a comparator configured to compare the voltages Vgs, Vds and Vt, according to the condition: Vgs−Vds>Vt and the compactor further configured to generate an alert signal when such condition is met.