Maximum efficiency tracking DC-DC converter applied to inductive power transmission system and control method thereof

Abstract

The invention belongs to the power transmission field and discloses a maximum efficiency tracking DC-DC converter applied to an inductive power transmission system and a control method thereof. The converter comprises an LCL-S compensation topology, an uncontrolled rectifier bridge and a double-tube Buck-Boost circuit. Output of the LCL-S compensation topology is connected with input of the uncontrolled rectifier bridge, and the output of the uncontrolled rectifier bridge is connected with the input of the double-tube Buck-Boost circuit. In the invention, inductive power transmission constantvoltage control is realized by adjusting a phase shift angle between leading and lagging bridge arms of a full-bridge inverter circuit, impedance matching is realized through controlling a DSBB switching tube by adopting a staggered duty ratio bias modulation strategy, and an equivalent load at an output side of a rectifier bridge is always kept at a maximum efficiency load point. According to theinvention, a double-tube structure can effectively reduce a voltage and current stress of the switching tube so that system output has a wider voltage range and a higher power level. Through adjustment of a buck-boost mode, an adjustable range of a load of the system is wider when the system achieves maximum efficiency tracking, and applicability of the system is greatly increased.

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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