分析了常用浪涌抑制方法的不足之处。提出了一种直流浪涌抑制电路的设计思路和实现方法。该电路采用开关方式抑制浪涌，经过电路优化和实际验证，其浪涌抑制性能良好，性能指标完全能够达到应用要求。该电路结构简单、成本低廉、体积小巧，相比其它浪涌抑制器，具有很多优点，可以广泛应用于各种需要浪涌抑制的电子设备上。

Defects in surge suppressor in common use was analysed. The design and realization of a DC surge suppression circuitry was expounded. The surge is suppressed by using an electronic switch. After optimization optimize and verify, good performance is achieved, matching the target of applications. Although this circuitry is simple, inexpensive and small, it has many advantages comparing with other surge suppressors which can be used in various kinds of electronic equipments that need surge suppression.