By replacing the crowbar diodes with a TVS, the drawbacks of the diode-stacks, which are very weak in high-voltage surges and are expensive to replace in case of failure, can be overcome.

• 用价格相对低廉的触发真空开关来代替硅堆，可以克服硅堆抗浪涌能力差、损坏更换费用高的缺点；