Wireless power transfer system sliding-mode control method based on Buck link

Abstract

The invention discloses a wireless power transfer system sliding-mode control method based on a Buck link, the method comprising the following steps of S1, determining the optimal switching point andthe steady state point on a uC1-iL phase plane by using the output capacitor voltage uC1 and the freewheeling inductor current iL of the Buck link as detection objects; S2, determining the slope of asliding-mode line and the longitudinal-axis intercept according to the optimal switching point and the steady state point; S3, determining whether current limiting control is needed, and if so, adjusting the slope of the sliding-mode line; S4, determining whether load switching occurs, and if so, adjusting the longitudinal-axis intercept of the sliding-mode line; S5, obtaining the output capacitorvoltage uC1 and freewheeling inductor current iL in real time, and controlling the state of a switch tube in a Buck circuit according to the sliding-mode control strategy. The method can accelerate the dynamic response, shortens a dynamic process, limits the current overshoot by changing the slope of the sliding-mode equation, quickly restores the output voltage of the secondary side to an original state during load switching, and improves the robustness and adaptability of the control.

Description

technical field [0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a sliding mode control method for a wireless power transmission system based on a Buck link. Background technique [0002] There are many ways to implement wireless power transfer (WPT). At present, wireless charging systems mostly use inductive power transfer (IPT) technology, which uses the principle of electromagnetic induction to realize the connection between electricity and magnetism. In order to realize the "wireless" of wired charging, the action of manually plugging and unplugging the charging line is eliminated, the risk of leakage is avoided, there is no contact wear, it is safer, more beautiful, more convenient, and it can also improve the degree of automation of the system. [0003] Such as figure 1 The wireless power transfer system based on the Buck link shown is one of the circuit topologies commonly used in wireless charging syste...

AI Technical Summary

Problems solved by technology

However, there are still few studies on the dynamic response optimization of high-order circuit systems. The current method is usually to reduce the order or perform equivalent transformation. The complexity of the algorithm is high, and the timeliness of the dynamic response is difficult to be satisfied.

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