A wireless charging circuit and system

Abstract

The invention provides a wireless charging circuit which comprises a charging circuit, an intermediate energy storage circuit, a load circuit and a control circuit; wherein the intermediate energy storage circuit comprises a transmitting circuit and a receiving circuit; the input end of the charging circuit is connected with an external direct-current power supply, and the output end of the charging circuit is connected to the input end of the transmitting circuit in an electric connection mode; the output end of the transmitting circuit is connected to the input end of the receiving circuit in a magnetic induction coupling mode; the output end of the receiving circuit is connected to the input end of the load circuit; and the transmitting circuit and the receiving circuit are both a resonance circuit. By means of resonance, the energy of the transmitting circuit is wirelessly transmitted to the input end of the receiving circuit through the output end of the transmitting circuit. Theoutput end of the load circuit is connected with a load; the control circuit is used for controlling the charging circuit, the transmitting circuit and the receiving circuit, the working time sequenceof the load circuit under different working states is controlled. According to the wireless charging circuit, the charging efficiency is high, and the higher output power capability is also ensured.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a wireless charging circuit and system. Background technique [0002] Wireless power transmission technology, in the 1890s, Nikola Tesla invented the "Tesla coil", which was able to transmit power through the air, and since then opened the era of wireless power transmission. [0003] Wireless charging technology is a relatively popular charging technology at present. Because the charger and the power-consuming device transmit energy through a magnetic field, the two do not need to be connected by wires, so the charger and the power-consuming device can be made without exposed conductive contacts. It has the characteristics of convenient use, beautiful appearance and brief introduction, and is widely used in electronic products such as mobile smart terminals. [0004] In the traditional wireless charging scheme, the receiving end realizes the transmission of energy thro...

AI Technical Summary

Problems solved by technology

However, according to the distance between the electromagnetic induction coils, the coupling state of the wireless charging system will also change; if the distance is smaller, the coupling degree will also increase. At this time, the transmission and reception frequency of wireless energy is accelerated, and the power transmission capacity of the charging system The efficiency and efficiency will increase at the same time, but when the coupling coefficient increases to a certain value, the receiving circuit of the subsequent stage will generate a reflected voltage to the transmitting circuit of the previous stage, so that the energy and power transmission capacity of the charging system will also decrease with the further reduction of the distance. Small

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