I need a circuit that detects a "rate of change" in a voltage signal, rather than just a change in voltage like a comparator does.
I need to detect Arcs in a pulsed power application, to initiate a crowbar to dump the energy before damage is done. (pulses up to 500kW)
The output pulses range from 100V to 1kV, 50usec to 2 msec.
The pulses also have a ripple that is necessary for the application, and the riple can be as much as +/- 500V and range from 20kHz to 50kHz.
And arc condition will result in a voltage change of about 100V/1nsec.
The circuit needs to respond within 1usec.
I have a fast, clean voltage signal that is 0-10V, representing 0-1200V.
I also have a current signal, but it is too slow to be of use.
Anybody got any ideas of how to make a circuit that triggers on a "rate of change" in voltage rather than just a voltage level?
I need to detect Arcs in a pulsed power application, to initiate a crowbar to dump the energy before damage is done. (pulses up to 500kW)
The output pulses range from 100V to 1kV, 50usec to 2 msec.
The pulses also have a ripple that is necessary for the application, and the riple can be as much as +/- 500V and range from 20kHz to 50kHz.
And arc condition will result in a voltage change of about 100V/1nsec.
The circuit needs to respond within 1usec.
I have a fast, clean voltage signal that is 0-10V, representing 0-1200V.
I also have a current signal, but it is too slow to be of use.
Anybody got any ideas of how to make a circuit that triggers on a "rate of change" in voltage rather than just a voltage level?