Fast charging switching circuit and method based on dual-interface plugging detection

Abstract

The invention discloses a fast charging switching circuit and method based on dual-interface plugging detection. The circuit comprises a power supply end, a rectification transformation circuit, a control system, a USB Type-A interface and a USB Type-C interface. A filtering degaussing circuit is connected between the rectification transformation circuit and the USB Type-A interface and between the rectification transformation circuit and the USB Type-C interface. The USB Type-A interface and the USB Type-C interface are connected with a switch unit. The control system is connected between therectification transformation circuit and the USB Type-A interface as well as between the rectification transformation circuit and the USB Type-C interface, and the control system comprises a fast charging control unit and a plugging detection unit. The method is applied to the circuit. According to the invention, the design cost of the circuit can be saved, the detectable equipment range is expanded, the scene switching is more efficient and time-saving, and the quick charging requirement is better met.

Description

【Technical field】 [0001] The present invention relates to the technical field of fast charging, in particular to a fast charging switching circuit based on dual-interface unplugging detection and a fast charging switching method applied to the circuit. 【Background technique】 [0002] In recent years, with the development of fast charging technology, more and more USB interface forms have emerged. As the latest interface form technology, TYPE-C is powerful and easy to use. In the current situation of more and more electronic devices, it is sometimes necessary to charge multiple electronic devices. In order to better take into account different USB interface forms, there are many dual-port charging solutions on the market. However, the existing schemes are not flexible enough for some detections, the action logic cannot adapt to the actual situation, and the efficiency is low. However, those with higher efficiency have complex internal circuits, resulting in higher manufactur...

AI Technical Summary

Problems solved by technology

However, some detections in existing solutions are not flexible enough, the action logic cannot adapt to the actual situation, and the efficiency is low

However, those with higher efficiency have complex internal circuits, resulting in higher production costs for the required hardware circuits.

[0003] In the technical solution of the prior art 1, the A and C ports are not independent, and only support 5V charging when the dual-port NMOS is turned on, and re-awakening the fast charging requires plugging and unplugging, which is not flexible enough to switch according to the corresponding scenario

[0004] In the technical solution of prior art 2, ports A and C are independent, and the two ports work separately. When the two ports are inserted, both ports A and C can perform fast charging, but the production cost is relatively high

[0005] Therefore, for some low-current devices, if the corresponding NMOS is turned off when plugged in, the plug-in is not easy to detect; when the dual-port NMOS is turned on, only 5V charging can be performed, and the load cannot be flexibly detected; the cost is high and the space occupied larger

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