电容损耗对脉冲氙灯放电特性的影响

摘要

研究了储能电容自身损耗对氙灯放电特性的影响,对脉冲氙灯放电回路进行了分析与改进.在实际电容自身损耗不为零的情况下,将电容等效为理想电容与损耗阻抗的串联,给出了计算氙灯放电特性的改进公式,并详细计算和分析了电容自身损耗增大情况下的氙灯放电电流和放电功率变化情况,计算结果表明:损耗增大会导致氙灯放电电流、功率峰值下降,闪光时间缩短,显著影响激光泵浦效率；电容损耗增大还会导致LC放电回路出现电容反充电现象,影响氙灯正常工作并缩短灯的寿命.实际的储能电容充放电实验证明,电容损耗增大会导致氙灯闪光的波形峰值下降、闪光时间缩短和电极溅射加剧,验证了理论分析的合理性.另外,实验证明环境因素对储能电容自身损耗的增大具有非常显著的影响.%The effect of storage capacitor's loss on the discharging characteristics of the xenon flash lamp was studied? and the xenon flash lamp discharging circuit was analyzed and improved. The capacitor can be equivalent to a series of an ideal capacitor and a loss resistance. The improved formula of the xenon lamp discharging characteristics was given when actual capacitance loss is not zero, and the xenon lamp discharging current and discharging power are calculated and analyzed in detail with the increase of the capacitor loss. The results show that the increase of loss will lead to the decrease of xenon lamp discharging current and peak power and the xenon lamp flash time, and influence laser pumping efficiency. The loss will also lead to the capacitor inverse charging in LC discharging circuit; this will influence normal working of the capacitor and decrease the life of the xenon lamp. The actual energy storage capacitor charging and discharging experiments show that the increase of capacitor loss will lead to the decrease of xenon lamp light-emitting waveform peak, shortening of the flash time and increase of the electrode sputter, thus verity, the reasonableness of theoretical analysis. In addition, the experiments show that environmental factors have very significant impact on the increase of the storage capacitor loss.