Noncontact power transmission device and power transmission method

Abstract

The invention discloses a noncontact power transmission device and a power transmission method. A rectifier and filter circuit is used for receiving high-frequency alternating current which is output by a receiving coil; a direct current voltage signal is obtained after full-bridge rectifying and filtering processing; when the condition that the direct current voltage after rectifying and filtering exceeds a preset value is detected, a current loop is formed by a switch protection circuit, an impedance matching circuit and the receiving coil, so that the energy of the receiving coil is transferred until the direct current voltage descends to a value which does not exceed the preset voltage value; the switch protection circuit is connected between an impedance matching network and the ground; when the power transmission device normally works, the switch protection switch does not work; and when the overvoltage condition is generated, the switch protection circuit carries out a switch motion to reduce the value of the direct current voltage.

Description

technical field [0001] The invention relates to the field of wireless charging, and more specifically, to a non-contact power transmission device and a power transmission method. Background technique [0002] Non-contact power transmission technology (also called wireless power transmission technology) is widely used in the field of electronic charging due to its advantages of safety and convenience. There are mainly two ways to realize wireless power transmission: magnetic induction and magnetic resonance. Magnetic resonance is commonly used The magnetic resonance wireless power transmission device mainly includes a transmitting part and a receiving part, both of which realize energy transmission through the principle of electromagnetic resonance. [0003] Generally speaking, the transmitting part includes an inverter, an impedance matching circuit and a transmitting coil, and the receiving part includes a receiving coil, an impedance matching circuit, a rectification circu...

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Problems solved by technology

[0005] However, during the power transmission process, the coupling between the transmitting coil and the receiving coil will change, such as a sudden increase in the coupling or a sudden increase in the magnetic field energy in the transmitting coil, which will result in a DC voltage V after the full-bridge rectifier circuit rect Exceeding the preset value, excessive voltage will damage the DC-DC converter of the subsequent stage, and even the electronic equipment on the load side

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