Fast charging system and method based on usb PD protocol

Abstract

The invention discloses a rapid charging system and method based on a USB PD protocol. The system comprises an adapter and a power utilization device; the adapter comprises a first input port, a first output port and a voltage transformation rectification filter voltage stabilizing circuit, and the voltage transformation rectification filter voltage stabilizing circuit comprises a first data processing chip which is based on the USB PD protocol and in data communication with the power utilization device; the power utilization device comprises a second input port connected with the first output port, a rechargeable battery and a charging control circuit, and the charging control circuit comprises a second data processing chip which is based on the USB PD protocol and in data communication with the adapter, a BUCK voltage conversion circuit and a constant current charging circuit; both the first output port and the second input port are Type C standard USB ports or Micro USB ports. According to the rapid charging system and method, the power utilization device directly adjusts the magnitude of the output voltage of the adapter through the USB PD protocol to make the adapter enter a constant current output work mode of the designated parameter, charging efficiency is high, and the power loss and heating in the power utilization device are lowered.

Description

technical field [0001] The invention relates to the technical field of charging of consumer electronic products, in particular to a fast charging system and method based on the USB PD protocol. Background technique [0002] Most consumer electronic products such as mobile phones, MP3, MP4, and tablets use Micro USB ports for charging, but limited by traditional USB charging specifications, the charging power is relatively small, whether it is 2.5W for USB 2.0 or 4.5W for USB 3.0. W is still 7.5W of USB BC 1.2. Although it can meet the charging needs of electric devices with relatively small battery capacity such as mobile phones and MP3 players, it still takes a lot of time to fully charge the battery. [0003] As the functions of consumer electronic products such as mobile phones and tablet computers become more and more powerful, the power consumption is also increasing day by day, and the battery capacity is limited, resulting in higher and higher charging frequency. Ther...

AI Technical Summary

Problems solved by technology

Second, the interface and connection impedance of the charging circuit

Third, the heat dissipation problem inside the mobile phone

The QC standard proposed by Qualcomm tries to break through the problem that the Micro USB interface and the connection line cannot carry high current by increasing the voltage and reducing the current, so as to obtain a faster charging speed. In this regard, it has indeed achieved certain results, and It has obtained the support of mainstream Android phones, but the QC technical standard still has the problem of heat dissipation of the DC-DC conversion circuit inside the phone

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