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Modeling And Simulation Of One Cycle Controlled Dual Boost Power Factor Corrector

Posted on:2008-09-16Degree:MasterType:Thesis
Country:ChinaCandidate:Y LuFull Text:PDF
GTID:2178360242456795Subject:Control theory and control engineering
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With the development of semiconductor materials, high power LED (Light Emmiting Diode) becomes the first choice for many lighting applications, and is the main force of New Century's Green Lighting project. LEDs require low voltage, high current drivers. And along with increasing of driving power, adding direct alternative current input to LED drivers becomes urgent. Thus a novel power factor corrector with direct AC line voltage input and constant current output is proposed in this thesis.According to above design goals, authur's main work lies in:1. By reading a great quantity of in-art articles and comparing existing solutions, a better solution comes out: One-Cycle controlled Dual boost converter working in Continuous Capacitor Voltage Mode (CCVM). Dual Boost has the same topology as traditional buck converter with input filter, which could "Boost" the current. CCVM guarantees the continuous input voltage and current, which avoid the "discontinuous input current" drawback of buck converter. One-Cycle control needs no multiplier to accomplish power factor correction and fast output regulation.2. To model the converter system with Three-Bandwidth Analysis. the whole system is consisted of switching frequency voltage feedfaword loop and line frequency current feedback loop. The former makes input voltage track input current, thus power factor correction. The latter guarantee a constant output current. Feedfaword-control, feedback-control, input disturbance-output, load disturbance-control transfer functions are established, meanwhile stability requirements for circuit components are given out in this part.3. To simulate frequency domain and time domain response with MATLAB and Saber Designer, respectively. After calculation of circuit components, MATLAB simulation result helps to settle error amplifier (the PI compensator). Saber Designer's many analysis functions, such as DC, Transient, Vary, Monte Carlo analysis, time domain verification of converter function is achieved. Through analysis, simulation and verification, the conclusions come out: proposed converters have intrinsit output current regulation; input current has the same phase with input voltage; soft start and low switch stresss during start-up etc. However, simulation results show that input current distortion is severe, and inductance in power stage is higher than other topologies.
Keywords/Search Tags:power factor correction, duality theory, one-cycle control, constant current source
PDF Full Text Request
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