Abstract:
In order to solve the problem of measuring the fast-rising pulsed voltage in nanosecond electrically exploding wires, a resistive divider with capacitance compensation is constructed. The stray capacitance to the ground and the parasitic capacitance at the end of resistive arms are the main factors affecting the high frequency response of the resistive divider. Therefore, a method for compensating the stray capacitance through theoretical analysis is presented, and a three-dimensional model is built using the finite element analysis software to assist the design of the compensation capacitor. In order to increase the maximum operating voltage, a gel with a high dielectric strength and dielectric constant is applied as the medium of compensating capacitor. The simulation results of the model show that the voltage divider can maintain a stable voltage divider ratio and output voltage phase in the wide-band domain ranging from DC to 100 MHz. The resistive divider is calibrated with a high voltage of pulsed square wave generated by a linear transformer driver. The resistive divider is implemented in a compact pulsed power generator. The designed resistive divider with capacitance compensation can be adopted to accurately measure the voltage waveform of nanosecond electrically exploding wires.