US Patent 7821766 Systems and methods for pulse delivery

An apparatus for interfering with locomotion of a target by conducting a current through the target includes according to various aspects of the present invention a transformer, a capacitance, a charge detector, and a processor. The transformer has a secondary winding that is coupled to the target to provide the current. The capacitance is in series with the secondary winding and is charged to a voltage. The charge detector detects a charge provided through the target by the capacitance and the secondary winding. The processor sets the voltage (e.g., for charging for a next pulse) responsive to the charge detected by the charge detector.