充等离子体微波源高压电源的撬棒保护

 充等离子体高功率微波源——PASOTRON的高压直流电源工作电压为-70kV至-150kV、电流为300A左右，而调制器又悬浮于此高压上工作（电流为60A，脉宽60～120ms）。在工作中，一旦出现管子打火，很容易打坏管子、高压直流电源、调制器或控制柜的电路模块。因此，其控保系统就显得尤为重要。为此采用一种专门研制的高压撬棒，利用简单的自触发电路，达到了满意的保护效果。实验证明，从管子打火到撬棒管作出分流仅滞后150ns，可以分流掉滤波电容中98%以上的储能，工作稳定可靠。

Crowbar circuit protection of high voltage power supply of plasma filled HPM source

The operation voltage of high voltage DC power supply of plasma filled high power microwave source-PASOTRON is from －70kV up to －150kV, the total current is about 300A, while the modulator(current 60A, pulse width 60～120μs) is operating suspended on the HV-DC. In practice, if the strike arc occurs, there is a strong potential to destroy the microwave tube, high voltage DC power supply, modulator or/and modular circuit of the system. The protection system of the power supply, therefore, plays an important role in the operation of system. The special designed HV crowbar and a simple self-triggering circuit is applied, and a satisfied protection result is achieved. The experiments show that, 98% of the energy of the filtering capacitor would be bypassed by the crowbar after 150ns of the strike arc.