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|Title:||Digital controller for interleaved PFC operating in critical mode – Emerson Network Power HK Ltd|
|Authors:||Fan, Wing To (范永滔)|
|Department:||Department of Electronic Engineering|
|Award:||Won the Second Runner-Up in the 2012–13 Best Final Year Project Competition (Individual) organised by the Energy Institute (Hong Kong Branch).|
|Supervisor:||Prof. Henry S. H. Chung|
|Abstract:||Power factor correction is a hot topic in recent decade due to growing number of countries restricts the harmonic pollution generated by electronic device and demand of high efficiency system. In this project, an interleaved boost power factor corrector which operating in critical conduction mode is implemented using dsPIC33F microcontroller. The power factor corrector (PFC) is used as a DC/DC converter inside the primary side of a 600W switching mode power supply. The input of PFC is connected to an EMI filter and full-bridge rectifier to produce a DC voltage from AC line. And the output of the PFC is connected to a resonance converter. The PFC is controlled using fixed on-time control with current total harmonic distortion (iTHD) optimization so that the iTHD of the input current can be reduced (~5% in full loading) compare with normal fixed on-time control. Furthermore, varies input and output parameters are monitored to improve the reliability of the system. Based on the sensing data, the PFC can provide input brown-out protection, input over current protection, input voltage range limitation and output over voltage protection. Besides from protection functions, output step loading is also supported to handle varying loading environments such as LLC converter and transient respond. From the testing results, the PFC system achieves high power factor (>0.99 starting from half loading) and low iTHD in both high line and low line conditions, and can be competing with and even better than other PFC in the market. And the input AC line voltage of the PFC is from 90V – 240V with maximum output power of almost 660W. Also, real time monitoring of the PFC status is supported. An android app is provided for the user to monitor the operating status of the PFC via Bluetooth. An extra Bluetooth module is designed to communicate with the microcontroller in PFC using UART and transmit Bluetooth signal to our phone afterwards.|
|Appears in Collections:||Student Works With External Awards |
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