With a pair of copper foil cards inserted into the head with an electrostatic gun, 4KV has a high probability of crashing. In fact, low-voltage work electronic products are faced with frequent ESD discharge hazards in the actual customer use process. This article uses an experimental method to effectively explain the failure of low-voltage products in actual ESD test. In this experiment, a magnetic stripe card of the same size is used, and after the copper skin is attached, the actual phenomenon of static electricity generation and electrostatic power generation during the use of the user is simulated. The electrostatic gun directly discharges the magnetic head directly through the copper skin attached to the magnetic stripe card. ã€Symptom】 With a pair of copper foil cards inserted into the head with an electrostatic gun, 4KV has a high probability of crashing. ã€Cause Analysis】 Through the disassemble analysis, the ESD energy is transmitted from the electrostatic gun to the magnetic head through the copper foil, and then transmitted to the magnetic head rail through the parasitic parameters, and then interferes with the whole system. After comparative analysis, the line indicated by the blue box in the following figure If the cable is unplugged, the problem can be solved. The cable can be placed on the PCB and fixed with the art adhesive tape. The problem can be solved. For this reason, we need to find the ESD sensitive signal in the cable. After comparison, we found that two of the signals are compared. Weak, after adding TVS can also solve the problem. ã€Rectification program】 Taking into account the production and cost, we do not need to change the version, that is, the board cable can be fixed on the SAM board with the art adhesive tape to solve the problem. Therefore, we adopt the method of adding art adhesive tape. Just say two sentences In the design process, you should minimize the electrostatic air coupling, such as directly changing the inter-board cable to the inter-board connector, and keeping the connector away from the ESD-generating area, and placing the other side, unhappy! If this cable cannot be moved, and it must be prevented because of assembly problems, then the filtering of sensitive signals between the boards should be added at the beginning of the design! ~ Remoter Controller,Remote Control,Wireless Remote, Universal Remote Control,universal remote NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com
