Design Of DC/DC Converter With Embedded Inductors In LTCC

With the rapid development of modern power electronics technology,all kinds of electronic devices tend to be miniaturized and integrated.As an important part of the circuit system,power supply is also the same.Especially with the wide application of communication and portable equipment,small and high efficiency will become the development direction of power management.In the power module,magnetic components often occupy the largest volume and space.How to reduce the volume of magnetic components in power modules has become an important factor affecting the miniaturization of power modules.Low temperature co fired ceramic technology(LTCC),as a new type of electronic packaging technology,can integrate the circuit and inductor,transformer and other passive devices into the multilayer ceramic substrate,which can effectively reduce the volume of the power supply module and improve the power density.This paper first introduces the research status and development trend of the switching power supply module,and the research results on the miniaturization of switching power supply at home and abroad.Secondly,the common topology and characteristics of switching power supply are analyzed,and the basic working principle of switching power supply is briefly analyzed.Based on the BUCK buck topology,and for the two different output currents of 3 A and 5 A,two DC/DC converters are designed.The converter uses the DCS control mode and the D-CAP2 control mode respectively.According to the different load conditions,the converter can automatically switch between pulse width modulation mode and pulse frequency modulation mode to realize the high efficiency of the converter in the whole load range.The input voltage of the DC/DC converter is about 5V,and the output voltage is 3.3V.The DC/DC circuit is simulated and verified by OrCAD Capture simulation software.The simulation results show that the circuit can work normally and meet the electrical requirements of the system.After that,the PCB board of the circuit is designed and made,and the PCB circuit is tested.Then,based on the characteristics of the LTCC process,magnetic substrate integration design was performed on the inductor in the switch circuit.The feasibility of the LTCC inductor substrate integration is analyzed in detail,and the magnetic saturation characteristics of the inductor and the influence of the inductor current on the inductor inductance are discussed.Based on the nonlinear characteristics of the inductor,an inductor structure embedded in the LTCC substrate is designed.In accordance with the LTCC process,the power module was processed and tested.As a result,the feasibility of the miniaturization of the power supply module by the magnetic substrate integration technology.Finally,the paper's full-text work is summarized and the future work is prospected.