Application Of Integrated Device Based On LCC Resonant Converter In Constant Current Source Field

The lives of the community have enrolled in the industry 4.0 age within the past50 years,science and technology have rapidly improved.In order to satisfy the demand for electric energy.The future study direction of power electronic technology is advancing towards higher frequency,modularization,and integration.On the one hand,because of its soft switching characteristics,resonant converter can resist switching short circuit and open circuit,and plays an important role in switching power supply with high frequency and high power density.Among them,LCC resonant converter is mainly used in constant current source and constant current drive,wireless DC charging and other fields.On the other hand,switching power supplies including high frequency and high-power density will inevitably take up a lot of space due to too many discrete passive components.In the meantime,switching power supply works in high frequency environment will produce parasitic parameters,which will increase the circuit loss,and the power density of the circuit will decrease with the increase of the loss.In order to further improve the power density of switching power supply devices and reduce the influence of high-frequency parasitic parameters on circuit losses,this research uses passive component integration technology,and takes LCC resonant converter as an example,integrates the passive components in resonant circuit through a specific integration method,and makes a model prototype of the integrated device,and verifies the feasibility of the design through experiments.Firstly,the development status and trend of switch power supply are summarized in line with the field of modern power electronics technology.Then,LCC resonant converter and its key role in the field of constant current source are analyzed,which covers the circuit topology,working principle and operation mode of LCC resonant converter.What’s more,the development status of passive component integration technology at home and abroad is analyzed,in which the planar printed circuit board integration technology and flexible multilayer strip integration technology are mainly introduced.At the same time,it makes the contrast of their own respective advantages and application prospects.Secondly,since too many discrete passive components in the bidirectionally coupled LCC resonant converter with common mode inductance will cause a large amount of volume to be occupied and reduce the power density of the switch power supply,the flexible multilayer strip integration technology is used to integrate the energy storage elements in the resonant circuit.Then,the structure diagram,magnetic flux density analysis,design steps and calculation parameters of the integrated unit are given.Besides,it makes the prototype of the integrated device in line with the designed integrated unit parameters.After that,a variety of magnetic circuit simulation experiments on the Maxwell simulation platform is carried out to verify the feasibility of the designed integrated device of passive components based on the LCC resonant converter.Then,the Distributed Electro-Magnetic Component model based on the flexible multilayer strip integration technology is built on the Matlab/Simulink platform.Besides,the generation and distribution of parasitic parameters in the passive component integration device based on LCC resonant converter are analyzed.After that,the loss of the designed prototype is analyzed,and the method is proposed to reduce the parasitic parameters.Finally,the stability of the output current control of the integrated device based on the LCC resonant converter in the field of constant current source is verified,which constructs the simulation model on the Matlab/Simulink platform.The design adopts the way of combining PI closed-loop control with hysteresis control,and adopts the way of pulse frequency modulation to control output current.The simulation experiment contrast is made under the condition of fixing PI parameters and self-tuning PI parameters,which verifies the stability of the output current of the integrated device based on LCC resonant converter.