At present, both the public and industry users have a wide range of needs for obtaining location and its related services.For the public, the system is mainly required to provide a location service gateway to publish location-related information, such as public inquiry services such as the nearest store and station.At present, the horizontal applications of location services mainly include determining the user's location, querying each other's location, various information services related to the user's current location, such as life, transportation, entertainment, services, public facilities, etc.,and developing location-based entertainment games, etc.; vertical market Application mainly refers to the combination of mobile network location services and industry applications to launch services in professional fields, including applications in rescue location services, nursing services, vehicle scheduling, logistics management, location advertising, and company internal management. Therefore, the research on the key technology of location based service system and its application has strong theoretical and practical value. The focus of this article is to push the latest location service and wireless communication terminal surge protection solutions of Shuokai Electronics to engineers. The first thing to introduce is the GPS port protection solution. The following is the GPS port designed by our FAE engineers for customer needs. Protection scheme circuit diagram and recommended lightning protection/overvoltage/overcurrent protection devices.

Protection solution for GPS Port

Gas Discharge Tubes(GDTs)

GDT【SC2E5-90LSMD】DC Spark-over Voltage：90±20%V，Nominal Impulse Discharge Current（8/20μS）：5kA，Maximum Capacitance＜1.0pF，Minimum Insulation Resistance＞1GΩ；

PTC Resettable

PTC1【SCF160-16-1812RB】Vmax：16V；Imax：40A；Ihold：1.6A；Remark：SMD

TVS Diode

TVS【SMAJ5.0A】Vbr：6.40-7.00；Ir：SuA；Vrwm：5.0V，Ipp：9.2A；Package：SMB/DO-214AC.

GPS interface test 1.2/50μs, 8/20μs combined wave

Test Conditions:

It has been confirmed by the results of many simulation experiments conducted by Shuokai FAE engineers in the EMC laboratory that the surge generator can be used to impact common mode, differential mode 6KV, 3KA under the working conditions of communication and positioning service terminals.The lightning surge protection of the same type of GPS port can directly use the protection electronics components recommended by this solution.If the parameters and protection levels are different, you can directly contact SOCAY, we will design suitable protection solution for your product depend on specific parameters, protection level.