Selection of operating frequency point and optimization method of plate voltage for bilateral lclc type cpt system

Abstract

The invention discloses a method for selecting a working frequency point of a bilateral LCLC type CPT system and optimizing a pole plate voltage, and belongs to the technical field of wireless energy transmission. The system includes: a high-frequency full-bridge inverter circuit, a primary-side LCLC compensation network including a primary-side compensation inductor and a primary-side compensation capacitor, a coupling capacitor plate including two emitter plates and two receiver plates, and a secondary-side compensation inductor and a secondary Secondary side LCLC compensation network of side compensation capacitor, full bridge rectification filter circuit. This application deduces that the bilateral LCLC type CPT system can realize multiple frequency points of constant current output, select the optimal operating frequency point for the purpose of reducing the volume of the system, improve the system output gain, and broaden the load range of the system under continuous working mode ; When the system works at the optimal frequency point, the application realizes the reduction of the voltage stress of the coupling plate, the approximate zero reactive circulation of the circuit and the soft switching of the switching device by setting the parameters of the compensation network, and improves the efficiency and efficiency of the wireless power transmission system. Reliability and cost reduction.

Description

technical field [0001] The invention discloses a method for selecting a working frequency point of a bilateral LCLC type CPT system and optimizing a pole plate voltage, belongs to the technical field of wireless energy transmission, and is suitable for applications requiring constant current output such as LED power supply and battery charging. Background technique [0002] At present, domestic research on wireless power transmission (WPT, Wireless Power Transmission) technology mainly focuses on the magnetic field coupling method. The electric field coupling uses high-frequency electric field as the energy carrier. When the high-frequency alternating current acts on the emitter plate, an interactive electric field is formed between the emitter plate and the receiver plate to generate a displacement current, which realizes the The energy transmission has the advantages of being able to pass through the metal isolation layer, low electromagnetic radiation, and small size. ...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and provide a method for selecting the working frequency point of the bilateral LCLC type CPT system and optimizing the plate voltage. Improve the system output gain and broaden the optimal operating frequency point of the load range under the continuous working mode of the system, adjust the compensation network parameters based on the selected optimal operating frequency point, realize the reduction of the voltage stress of the coupling plate, and solve the problem of the existing bilateral LCLC The technical problems of the coupling plate voltage stress of the type compensation network are large, the load range is small in continuous operation mode, and the system volume is too large

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