A multi-eSIM switching circuit based on NPN transistors

Abstract

This application relates to the field of portable WiFi technology, and provides a multi-eSIM switching circuit based on an NPN transistor. The circuit includes a main control system, multiple eSIM chips, and multiple switching modules. Each switching module includes an NPN transistor. The control pins of the main control system are connected to the base of the NPN transistor in each switching module, and the signal pins of the main control system are connected to the corresponding signal pins of the eSIM chips. The ground pin of each eSIM chip is connected to the collector of the NPN transistor, and the emitter of the NPN transistor is grounded. The control pins are used to output control signals, controlling the conduction or cutoff of the NPN transistor by pulling it high or low. The ground pins ensure that the eSIM chip is in working state when the NPN transistor is on. This application significantly reduces circuit cost, simplifies circuit design, and improves switching reliability and system stability.

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