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

A technology of wireless power transmission and control method, which is applied to control/regulating systems, regulating electrical variables, electrical components, etc., and can solve the problems of difficulty in meeting the timeliness of dynamic response and high algorithm complexity

Active Publication Date: 2018-10-23
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 o...

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

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Embodiment Construction

[0038] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the product of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

[0039] This embodiment takes figure 1 The wireless power transfer system based on the Buck link shown is further explained, through figure 1 It can be seen that E in the system is a DC input voltage source, and the switching tube S g , Freewheeling diode D S , freewheeling inductance L and filter capacitor C 1 The composed Buck circuit regulates the input voltage u of the subsequent IPT system C1 , so as to achieve the purpose of power adjustment. Q 1 ~Q 4 It is the switching tube of the inverter circuit, working in the soft switching state, inverting the front-stage direct current into high-frequency alternating current, and transmitting the elect...

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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...

Claims

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Application Information

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IPC IPC(8): H02J50/12H02M3/335H02M3/156
CPCH02J50/12H02M3/156H02M3/33569
Inventor 唐春森王智慧孙跃左志平苏玉刚叶兆虹朱婉婷梁泽
Owner CHONGQING UNIV
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