Research On Key Technique Of High Frequency Linear Power Converter

This thesis introduces the basic structure and mathematical model of general linear regulator,and improves the design of traditional linear regulator based on three key technique about how to realize high slope switching,high current output and high efficiency conversion.A linear current slot with high frequency and high slope and a linear voltage source based on droop method and multi-level power supply are put forward.On the basis of simulation,a prototype is made and a series of studies are carried out.In view of the response speed,this thesis designs a linear current slot with high frequency and high slope.On the basis of the traditional linear regulator,the differential circuit is added to reduce the common mode interference.T he integral controller is used to facilitate the debugging of the whole circuit and increase its stability.T he amplifier circuit adopts the high frequency and high power characteristics N-MOS program.A test prototype of 10 parallel connection is designed.The current slope is up to 73 A/ μs and the overshoot is about 12% when the input frequency is 100 k Hz and the peak current is about 20 A.T he experimental target is achieved.For the high curr ent output and high efficiency conversion,this thesis designs a linear voltage source based on droop method and multi-level power supply.To change the equivalent output impedance of the single linear regulator which to solve the current sharing error problem when the whole current multi-channel parallel and high current output,the droop method is applied to the linear regulator.Outer loop control is adopted on the basis of multi-level parallel connection,which is conducive to the stability of the entire s ystem output.In the main power circuit,multi-level power supply is adopted.According to the output of the linear circuit switching power supply voltage to improve the efficiency of the whole circuit.In the case of 5-way parallel and 200 k Hz signal input,the current sharing error using the droop method is only about 2%-4%,the output peak voltage of the circuit can reach 14 V,the peak current is 10 A.The circuit efficiency increased by 22% by adding multi-level power supply to achieve the entire circuit low-voltage and high-current working conditions of high efficiency output.