Constant-current and constant-frequency inductively coupled transmission system and design method thereof

Abstract

The invention discloses a constant-current and constant-frequency inductively coupled transmission system and a design method thereof. The system comprises a direct current power supply, a high-frequency inverter, a primary reactive compensation mechanism, a mutual inductance coupling mechanism, a secondary reactive compensation mechanism, a rectifier and filter device and a variable load. The constant-current and constant-frequency inductively coupled transmission system is characterized in that wireless transmission of primary and secondary electric energy is achieved through the mutual inductance coupling mechanism; high-frequency sine alternating current which is picked up by the primary side of the mutual inductance coupling mechanism is rectified and filtered through the rectifier and filter device; the output current is constant; the whole system works in a complete resonant state and does not change along with change of the load; and the power supply requirements of the current-type variable load are met. The constant-current and constant-frequency inductively coupled transmission system has the significant effects that through certain topology designs of primary and secondary reactive compensation mechanisms and a system parameter design, constant outputs of the load current and the primary resonance current of the system under a variable load condition are achieved; the stability of the working frequency of the system is ensured; and the system is simple in overall structure and safe and reliable to work.

Description

technical field [0001] The invention belongs to the field of wireless energy transmission, and in particular relates to a constant current constant frequency inductive coupling transmission system and a design method thereof. Background technique [0002] In recent years, wireless power transmission technology has been developed rapidly, and the products using this technology are increasing. Among them, inductively coupled power transfer (ICPT) technology is a flexible, practical and new wireless power transfer technology based on the principle of electromagnetic induction, which has been widely used in medical, transportation, robotics and oil exploration and other fields. In industrial applications, constant current sources are often used in battery charging, automatic instrument and sensor power supply, and LED drive. [0003] In ICPT system design, in order to improve the system’s ability to carry loads, it is usually required that the current output from the system to ...

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Problems solved by technology

[0005] For the current ICPT system design, in order to keep the load output current constant, the primary resonance current constant and the system resonance operating frequency stable, closed-loop negative feedback control for different control objectives is introduced, resulting in complex system structure, high cost, low safety and In order to solve the problem of poor reliability, the present invention proposes a new composite resonance type inductively coupled power transmission system, which naturally meets the above-mentioned control objectives through system structure design and parameter design, which not only simplifies the system structure, saves system cost, but also improves System Security and Reliability

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