Research And Design Of Power Management System Based On Wireless Energy Transmission

With the continuous innovation of technology,the application of wireless energy transmission technology in portable electronic devices has become more and more extensive.Compared with the cable power supply method,it has demonstrated higher safety and convenience.At the same time,with the increase in the frequency of use of portable electronic devices,the demand for wireless energy transmission efficiency in applications is gradually increasing.Therefore,the realization of efficient and wireless energy transmission to portable electronic devices is important for future changes in people’s lifestyles significance.As the increasing application of portable electronic products,the design and research of power management chips has become one of the most concerned issues in the integrated circuit industry.Active rectifier and low dropout regulator(LDO)are very representative in the power management chip.Active rectifier plays an indispensable role in the wireless energy transmission system.The low dropout linear regulator is very representative.It has the characteristics of low power consumption,low noise,simple structure,and good load regulation ability.Therefore,it is used in various portable electronic equipment and implantable electronic equipment.It has a wide range of applications.In addition,the continuous development of CMOS technology and the continuous reduction of feature sizes have allowed integrated circuits to gradually develop in the direction of high integration,and the power supply voltage has also decreased.Aiming at the corresponding key points required by the research,in this thesis,adaptive on＿off delay-compensated active rectifiers for wireless power transfer systems was realized based on the TSMC 0.18μm process and the low-dropout linear regulator without external capacitors was designed based on the CSMC 0.35μm process.A capacitor-less LDO with fast transient response and class AB super source follower is proposed,which is applied to the receiving end of wireless energy transmission system.The capacitance coupling technology is used to sense the load change and further enhance the transient response,which can effectively detect the load jump at the output end.It can also increase the charge and discharge current of the gate capacitance of the power device when the load jumps instantly,which will enhance the slow rate and the transient response.class AB super source follower is adopted in the buffer stage to achieve dynamic current increase without reducing power supply voltage requirements or increasing static power consumption.The introduction of negative feedback is order to achieve low impedance conversion pushes the sub-pole to a higher frequency and improves the phase margin of the loop.CSMC 0.35 μm CMOS process is used for design and simulation.The simulation results show that when the input voltage changes between 2.1 V and 4.8 V,the output voltage of the LDO is 1.2 V,and the maximum load current is 300 m A.When the load current changed between 2 m A and 300 m A,the maximum overshoot and undershoot of the output voltage are 111 m V and 188 mV,and the response time are 3.2 μs and 2.1μs.