On-line compensated calibration of capacitive voltage divider used in low impedance pulse forming lines
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摘要: 讨论了低阻抗脉冲形成线中测量充电电压所用电容分压器的标定方案,提出了采用外部并联电感来补偿较大的形成线电容负载的方法。由于低阻形成线的电容负载影响,使用脉宽较短方波发生器易导致波形缺乏平顶,使用输出电压较低正弦波发生器导致信噪比不高。采用合适数值的外部电感,可以实现与形成线电容的并联谐振,此时整体阻抗最大,可以使用普通放大器提高正弦波电压,且不产生失真。该方法可应用于微秒尺度低阻形成线电容分压器的在线标定。Abstract: The on-line calibration of capacitive voltage dividers used in low impedance pulse forming lines is discussed, and a parallel inductance is proposed to compensate the capacitive load of the forming line. Due to the low impedance of the forming line, the calibrated waveform will lack flattop if a short pulse square wave generator is used, and the calibrated waveform will have poor signal noise ratio if low voltage sine wave generator is used. By using a parallel-connected inductance, a parallel resonance circuit is formed. Low distortion and high voltage can be obtained from the amplifier. The method can be used in on-line calibration of microsecond capacitive voltage dividers in forming line voltage measurement.
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Key words:
- pulse forming line /
- capacitive voltage divider /
- calibration /
- amplifier
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