Bifurcation frequency transfer control circuit in inductive power transfer (IPT) system and control method thereof

Abstract

The invention discloses a bifurcation frequency transfer control circuit in an inductive power transfer (IPT) system and a control method of the bifurcation frequency transfer control circuit. The bifurcation frequency transfer control circuit comprises a power module, a switching network, a primary side resonance compensating circuit, a transmitting coil, a receiving coil, a secondary side resonance compensating circuit and loads. The bifurcation frequency transfer control circuit is characterized in that a delayed interference module is connected on a controller, and the controller controls the working condition of the switching network according to a delayed interference signal output by the delayed interference module and a zero-cross signal output by a zero-cross detection circuit. The bifurcation frequency transfer control circuit has the advantages of being simple in circuit structure, convenient to control and free of the requirement for addition of excessive circuits on a main circuit. Only timely delayed interference needs to be added on a detection feedback signal. According to design of the bifurcation frequency transfer control circuit in the IPT system and the specific control method of the bifurcation frequency transfer control circuit, phase track flow of the IPT system can be restrained to a specified stable attractor of a limit cycle, and therefore stability and reliability of the IPT system are improved.

Description

technical field [0001] The present invention relates to inductive power transfer technology (Inductive Power Transfer, referred to as IPT), specifically, a bifurcation frequency transmission control circuit in an IPT system and a control method thereof. Background technique [0002] Inductive Power Transfer (IPT for short) is a new power transmission technology that uses high-frequency electromagnetic fields as energy carriers to wirelessly transmit electric energy from the power supply to the load in the form of magnetic energy. This technology has the advantages of safety, reliability and flexibility, and has broad application prospects in the fields of biomedical electronics, rail transit, electric vehicles, consumer electronics, etc., and has become one of the research hotspots in the field of power electronics. [0003] Such as figure 1 As shown, from the perspective of system structure, the IPT system includes two parts: primary side and secondary side. Output to the...

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Problems solved by technology

[0005] To sum up, the defect of the existing technology is: after the system enters the frequency bifurcation area with more than one stable resonance frequency with the change of parameters, which bifurcation frequency will work at has a certain degree of randomness. The method realizes the dynamic transmission control of the phase trajectory of the limit cycle attractor corresponding to the specified frequency, which leads to problems such as unstable transmission efficiency of the system

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