Multi-primary coil current and load voltage control method for inductive power transfer system

Abstract

The invention discloses a multi-primary coil current and load voltage control method of an inductive electric energy transmission system. The main method is to use the discrete value of the current signal of the primary coil k, the discrete value of the total current of the primary coil, and the phase-shifted discrete value of the total current to obtain the total current of the primary coil through a fast active and reactive current decomposition method without a phase-locked loop The amplitude, the virtual active current value of the primary coil k and the virtual reactive current value of the primary coil k are used as the feedback values ​​of the three PI regulators of the primary coil k, and through the joint action of the three PI regulators, each primary coil k The output voltage fundamental wave amplitude and phase of the inverter are adjusted, and finally the currents of each primary coil k have the same amplitude and phase, so that the load voltage output is constant. The hardware circuit of the method is simple, the algorithm complexity is low, the feedback value obtained is more accurate, and the primary coil current has the same amplitude and phase control effect.

Description

technical field [0001] The invention relates to a multi-primary coil current and load voltage control method of an inductive electric energy transmission system. Background technique [0002] Inductive power transfer technology has been applied to rail transit trains, electric vehicles, implanted medical devices, etc. Compared with the traditional power transmission technology that relies on direct contact with conductors, its power transmission process is not affected by dirt, ice, water and other chemical substances, and there is no contact spark and contact wear, which effectively improves the safety and reliability of power supply. , has a good application prospect. [0003] The structure and working process of the inductive power transfer system are as follows: the power-frequency alternating current is rectified into direct current through a rectifier, and the direct current is converted into high-frequency alternating current under the action of a high-frequency inve...

AI Technical Summary

Problems solved by technology

Under the scheme of the traditional single-inverter single-primary coil as the energy supply side, since the semiconductor devices with high withstand voltage, high withstand current and high frequency in the inverter are quite expensive or do not exist in the market, only the traditional Single-inverter single-primary-coil solution cannot meet the requirements of high-power power supply

The power supply structure of multiple primary coils is adopted, and a primary coil is equipped with a high-frequency inverter separately, and the power level of the energy supply on the power supply side is improved through the superposition of the high-frequency magnetic field of each primary coil, but due to the delay of the driving signal and the error of the inductance and capacitance devices , so that there are differences between the primary coil currents and phases of each inverter, resulting in a reduction in the power obtained by the secondary energy pickup coils, reducing the transmission efficiency of the inductive power transfer system

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