Technology Research Of Optimized Slope Compensation In Peak Current Mode Controlled DC-DC Boost Converter

Due to using the nonlinear components,such as power tube and energy storage elements,switching power converter behaves as a strong nonlinear system.As a result,it will bring a large number of unstable phenomena,such as the sub-harmonic oscillation,bifurcation and chaos.These unstable phenomena worsen the working performance of the switching power converter.Therefore,the stability control of the system needs to be further studied.This paper takes the peak current mode controlled DC-DC Boost converter as research subject and focuses on the stability and dynamic response performance,puts forward a dynamic optimization slope compensation strategy,aims at solve the shortage of stability control strategy of DC-DC Boost converter.The purpose is to improve the stability and dynamic response performance of DC-DC Boost converter.The main works are as follows:a.The control effects and problems of the fixed slope compensation are studied under the peak current mode controlled DC-DC Boost converter.Through the simulation and experiments,the results show that the fixed slope compensation can effectively suppress the sub-harmonic oscillation.However,the fixed slope compensation exists the compensation problems and reduces the input power and dynamic response performance.b.In order to solve the problems of the fixed slope compensation,a dynamic optimization slope compensation strategy has been proposed according to the theory of resonance parametric perturbation.But the input voltage is in the ideal condition which will not change,so it can not applied to the engineering in the past research experiment.In the condition of variation of input voltage,this paper study the effects of dynamic optimization slope compensation to improve the converter stability and dynamic response performance.Through the simulation and experiments,the results prove the correctness and effectiveness of the compensation strategy.At the same time,the results show that the dynamic optimization slope compensation can not only effectively suppress the sub-harmonic oscillation and chaos,but also solve the problems of the fixed slope compensation.Therefore,it improves the stability and dynamic response performance of the system.