Wireless electric energy transmission system and constant-current and constant-voltage control method thereof

Abstract

The invention provides a wireless electric energy transmission system, which comprises a DSP processor, a wireless electric energy transmission device, and a change-over switch controller, a current acquisition circuit and a voltage acquisition circuit which are connected between the DSP processor and the wireless electric energy transmission device; the wireless power transmission device is arranged on a transmitting module to form a primary side LCC compensation network with change-over switches S1 and S2 and a primary side series compensation network with a change-over switch S3, and a secondary side LCC compensation network is formed on a receiving module; the change-over switch controller is connected with the change-over switches S1, S2 and S3; and the DSP processor issues a constant-current charging control instruction to the change-over switch controller, so that the change-over switch controller switches on the change-over switches S1 and S2 and switches off the change-over switch S3, and a bilateral LCC constant-current charging mode is realized; or a constant-voltage charging control instruction is issued, so that the change-over switch controller disconnects the change-over switches S1 and S2 and closes the change-over switch S3, and an S-LCC constant-voltage charging mode is realized. By implementing the invention, the defects in the prior art can be overcome, thecircuit structure is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of wireless power transmission technology and novel energy conversion technology, in particular to a wireless power transmission system. Background technique [0002] The emergence of wireless power transmission technology can effectively overcome a series of shortcomings of traditional wired power supply methods, such as: poor mobility of equipment, unsightly environment, easy contact sparks, exposure of power supply lines, etc., especially suitable for mobile equipment, electric vehicles, flammable Safe power supply for explosive environments and underwater and oil field downhole equipment. Therefore, the wireless power transmission technology is widely used in many fields. [0003] Usually, the most common load is the battery, but because the equivalent resistance of the battery is constantly changing, and its charging process includes two charging stages of constant current and constant voltage, that is, the cons...

AI Technical Summary

Problems solved by technology

[0004] However, there are several methods for the existing wireless power transmission device to achieve constant current and constant voltage switching charging: 1. Adopt the frequency conversion control method, that is, to make the wireless power transmission device realize constant voltage and constant current output at different frequencies, but the The frequency bifurcation phenomenon is caused, resulting in unstable operation of the device; 2. The method of adding a DC-DC converter to adjust after the secondary rectification output, but this method is not suitable for large load changes in order to avoid the occurrence of the limit duty cycle. In the case of large size, and the addition of a DC conversion circuit increases the volume of the system

3. Introduce closed-loop negative feedback control and adopt phase-shift control method in the circuit, but this method will also add too many devices, increasing control cost and complexity

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