| Electrical energy is one of the most widely used energy in daily life and industrialproduction，and people have paid more attention to the utilization of electrical energyEfficiently and safely. However, the use of power electronic devices result in a largenumber of the current harmonic, which greatly reduces the efficiency of the electricityand produce many security problems. With the limitation of the current harmonics in theworld, the power factor correction (PFC) technology, which has be proposed to solvethe problem of current harmonics, in order to improve the power factor, will be aninevitable trend of the power electronics technology and power supply design.A PFC control IC based on the leading edge modulation one-cycle-control.itoperates the Boost converter in continuous conduction mode with the average currentcontrol. The IC has the features of Input Brown-Out Protection and Enhanced DynamicResponse, and mainly contains OSC, Nonlinear Gain block, EVA, PWM comparator,Output Driver and protection block.In this thesis, the one-cycle control principle and one-cycle control APFC theoriesare presented. The control equations are derived. According to Design requirements, thesub-block design and simulation were accomplished, including5V Voltage Reference,PWM comparator, Nonlinear Gain and Enhanced Dynamic Response Circuit. Thetypical300W application circuit with the component parameters was designed. Thetransfer functions were derived in detail. The stability of the chip’s internal designedvoltage loop and current loop compensation is analyzed with MATLAB. The wholecircuit with300W PFC is simulated based on CSMC0.5μm BCD process. With thecondition of input voltage220VAC(50Hz), the output DC voltage is395V, and the PFis0.99. The chip’s dynamic response Performance is also simulated and verified.Based on the leading edge modulation one-cycle-control APFC theories, thesub-blocks were analyzed and designed. The Performance of the sub-blocks and IC hasbeen simulated and verified with EDA. |
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