Power supply switching system and method for wired charging and wireless charging

Abstract

The invention discloses a power supply switching system and method for wired charging and wireless charging, and belongs to the technical field of wireless charging. The system comprises a battery charging management module, a wireless charging receiving module, a path switch module, a wired access detection and overvoltage detection module, a wireless overvoltage detection and protection module and a signal processing and control module. And the signal processing and control module is responsible for receiving and processing signals transmitted by each module, and integrating the signals of each module to control the whole system. According to the invention, a battery charging management chip does not need to be additionally arranged, a perfect overvoltage protection circuit is provided, and a wireless charging power supply path and a wired charging power supply path can be safely switched.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a power switching system and method for wired charging and wireless charging. Background technique [0002] Some wireless charging receiving chips on the market integrate battery charging management modules, which are widely used in products such as wireless Bluetooth headsets. This wireless Bluetooth headset with wireless charging function usually has two charging methods, one is wireless charging through a wireless charger, and the other is wired charging through a power adapter. Wireless charging may generate high voltage at the receiving end during the communication process. If the two charging methods are carried out at the same time, this part of the high voltage may hit the power adapter through the power supply path, causing damage to the adapter and even causing safety problems. This requires a power switching method to reasonably switch between the two chargi...

AI Technical Summary

Problems solved by technology

The obvious disadvantage of this method is that an additional battery charging management chip needs to be added to the subsequent circuit, which wastes chip resources and increases costs.

In addition, many of these chips do not have overvoltage protection for the power adapter input terminal. If a bad adapter is connected or due to hot plugging, the output voltage exceeds the rated 5V. If this voltage is used to directly supply power to the subsequent circuit, it may be It will cause overvoltage damage to some devices in the subsequent circuit

This puts forward higher requirements on the withstand voltage of the subsequent stage circuit or needs to add an overvoltage protection circuit, which further increases the cost

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