This article introduces a DC power supply lightning protection electronic circuit design. The circuit adopts a conventional two-stage design method. The first stage is used to absorb large surges, and the latter stage uses TVS to further absorb the residual pressure. For details, please see below. The conventional two-stage design method is adopted. The first stage is used to absorb large surges, and the latter stage uses TVS to further absorb the residual pressure. The inductor is used for decoupling between the first and second stages to play a delay role, so that the MOV can act before the TVS. u The front stage common mode adopts a combination of varistor and gas tube; u The front stage differential mode adopts a combination of varistor and temperature insurance. The temperature insurance can eliminate the occurrence of fire when the varistor fails and shorts.

Component selection: varistor MOV temperature insurance TF discharge tube GDT inductor L transient suppression diode TVS14D 　　 The front stage common mode adopts a combination of varistor and gas tube; 　　 The front stage differential mode adopts a combination of varistor and temperature insurance. The temperature insurance can eliminate the occurrence of fire when the varistor fails and shorts.