Patent ID: 10901011

Abstract:
A current measurement circuit for determining a start time tSTART, an end time tEND, and/or a peak time tMAX for a current pulse passing through a current conductor. The current measurement circuit includes a pickup coil and a threshold crossing detector. The pickup coil generates a voltage VSENSE′ proportional to a magnetic field around the conductor, which is proportional to a change in current over time. The threshold crossing detector compares VSENSE′ and a threshold voltage and generates an output signal indicative of a transition time and whether a slope of VSENSE′ is positive or negative. The current measurement circuit can also include an integrator and a sample and hold circuit. The integrator integrates VSENSE′ over time and generates an integrated signal VSENSE. The sample and hold circuit compares VSENSE to tMAX and generates a second output signal which can be used to measure the pulse current.