An Adaptive Slope Compensation Circuit for Peak Current Mode of Boost Switching Power Supply

Based on the analysis of the basic principle of slope compensation, a high-precision adaptive slope compensation circuit for peak current mode boost DC/DC converter is designed. The circuit dynamically detects the input and output voltage of the boost circuit to realize automatic adjustment of the compensation amount with the change of duty ratio, which makes the ramp compensation slope optimized. The design uses a high-precision subtracter to improve the accuracy of slope compensation. While eliminating sub-slope oscillation and improving the stability of boost circuit, the negative impact of compensation on boost circuit is minimized, and the load capacity and transient response speed of boost circuit are guaranteed. The circuit is designed based on SMIC 0.18um CMOS technology, with simple structure, high reliability and easy engineering implementation. Spectre circuit simulator 17.1.0.124 64b simulation results show that the circuit has high compensation accuracy and wide input and output voltage range. When the working voltage is 3.3 V, the compensation slope can be adjusted adaptively under different duty cycles, and the minimum error between the compensation slope and the theoretical optimal compensation slope is only 0.42%.

Improved Design of Energy Supply Unit of WSN Node Based on Boost and BUCK Structure

The energy supply unit of WSN node based on solar cell-powered outdoor environment monitoring needs storage battery for energy buffering,thus resulting in the distribution balance problem among solar battery,storage battery charge and discharge,and load energy consumption power.Based on the analysis of sensor network characteristics and node composition,the overall design of energy supply unit of wireless sensor network node on the basis of self-harvesting solar energy is carried out in this paper.At the same time,the improved circuit structure based on Boost and BUCK structure was designed,the working mode and energy distribution mode of the circuit were analyzed,and the circuit and control flow were comprehensively analyzed.In order to verify the energy distribution,experiments were implemented for test.The results of compensating the conversion efficiency of the power converter show that the energy distribution efficiency is significantly improved.