A maximum efficiency tracking dc-dc converter applied to inductive power transmission system and its control method

Abstract

The invention belongs to the field of electric energy transmission, and discloses a maximum efficiency tracking DC-DC converter and its control method for inductive electric energy transmission systems, including LCL-S compensation topology, uncontrolled rectifier bridge and double-tube Buck-Boost circuit; LCL The output of the ‑S compensation topology is connected to the input of the uncontrolled rectifier bridge, and the output of the uncontrolled rectifier bridge is connected to the input of the dual-tube Buck‑Boost circuit. The present invention realizes the constant voltage control of induction electric energy transmission by adjusting the phase shift angle between the leading and lagging bridge arms of the full-bridge inverter circuit, and realizes impedance matching by controlling the DSBB switch tube by adopting an interleaved duty cycle bias modulation strategy. Keep the equivalent load on the output side of the rectifier bridge always at the maximum efficiency load point; the double-tube structure of the present invention can effectively reduce the voltage and current stress of the switch tube, so that the system output has a wider voltage range and a higher power level; The adjustment of the pressure mode can make the load adjustable range wider when the system realizes the maximum efficiency tracking, which greatly improves the applicability of the system.

Description

technical field [0001] The invention belongs to the field of electric energy transmission, and in particular relates to a maximum efficiency tracking DC-DC converter applied to an inductive electric energy transmission system and a control method thereof. Background technique [0002] Traditional power transmission methods such as sockets have the characteristics of hot plugging, which are prone to safety hazards such as electric sparks. Electrical isolation cannot be achieved, and maintenance costs are high. It is difficult to meet the needs of application scenarios such as electric vehicles, mine power supply, and underwater charging. Therefore, It is necessary to realize efficient inductive power transfer. How to improve the efficiency in the process of power transmission, reduce the transmission loss, and save the use cost is particularly important. [0003] According to the different forms of relay energy in the energy transmission process, wireless energy transmission...

AI Technical Summary

Problems solved by technology

Passive impedance matching is to use the inductor-capacitor impedance adjustment network to achieve the equivalent of a fixed load point, and dynamic tracking cannot be achieved

Active impedance matching means that when working at a fixed frequency, the Buck converter is used to adjust the equivalent load to ensure that the system operates at the maximum efficiency operating point. However, due to its own structural limitations, the adjustable range of the equivalent impedance on the load side is very large. Limited, not suitable for large load changes

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