Mobile phone wireless charging transmitting system with constant-power constant-current working mode

Abstract

The invention discloses a mobile phone wireless charging transmitting system with a constant-power constant-current working mode, and belongs to the technical field of electroinc device. The structurecomprises a power supply management circuit (1), an energy emission circuit (3) and a single-chip microcomputer (12). The system is characterized by structurally comprising a voltage regulation circuit (2), a current detection amplification circuit (4), a signal shaping circuit (5), an output automatic control circuit (6), a voltage detection circuit (7), a second A / D conversion circuit (8), a first D / A conversion circuit (9), a first A / D conversion circuit (10) and a second D / A conversion circuit (11). The working voltage of the energy transmitting circuit can be automatically adjusted, so that the transmitting system always works at the optimal voltage, and the system has the characteristics of safety, reliability, convenience in use and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment. In particular, it relates to a mobile phone wireless charging transmitting system with constant power and constant current working mode. Background technique [0002] Since electricity entered human life, wires are almost everywhere as a medium for transmitting electric energy, bringing a lot of convenience to our lives. However, the wired energy transmission method will be limited by space occupation and potential safety hazards caused by contact with electrical equipment. However, there is no direct electrical connection in the wireless energy transmission system, which can realize the energy supply of wireless devices without space constraints, and has the advantages of no plug-in links, no exposed conductors, and no danger of electric leakage and electric shock. There is no doubt that the charging method of mobile phones will gradually develop in the direction of wireless charg...

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Problems solved by technology

[0004] However, the above-mentioned patents also have certain shortcomings: the core high-frequency inverter circuit uses a fixed voltage for power supply, and the equivalent impedance reflected from the receiving end to the transmitting system is ever-changing. When the reflected impedance becomes small, it will cause inverter current. increase, thus posing a threat to the system or even causing damage, on the contrary, when the reflection impedance becomes larger, it will cause the inverter current to decrease, causing the charging power to be too small and slow down the charging speed

On the other hand, the system will not automatically stop transmitting energy when the load disappears completely (such as fully charging or removing the charging device). According to the theory of mutual inductance coupling, the transmitting system will instead transmit energy at the maximum power, resulting in energy loss and system damage.

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