單相AC-DC轉換電路精要.doc

2013 年全國大學生電子設計競賽單相AC-DC變換電路(A題)

【本科組】

單相AC-DC變換電路

摘要：本系統基于有源功率因數校正(PFC)芯片UCC28019及單片機AT90C516，設計并制作了單相AC-DC變換電路。系統電路主要包括六個模塊：變壓器模塊、功率因數校正模塊、過流保護和報警模塊、相位測量模塊、單片機顯示和控制模塊、輔助電源模塊。變壓器由自耦變壓器和隔離變壓器構成，可實現20~30V可調的交流電壓；功率因數校正模塊通過UCC28019芯片內部電壓和電流雙閉環控制實現輸出直流電壓36V，最大輸出電流可達到2.5A；過流保護模塊采集輸出電流，當電流超過2.5A，單片機控制繼電器關斷電源，以達到斷電的目的，同時報警電路提示；相位測量模塊采集輸入端的電壓、電流，經過零檢測和A/D轉換，至單片機AT90C516顯示。輔助電源模塊為UCC28019、單片機提供電源。測試表明，本文設計的單相AC-DC變換電路可實現輸入功率為37.5W，輸出功率為30W，效率為80%，功率因數為0.98，很好地實現了本次競賽“單相AC-DC變換電路”的各項指標，具有良好的人機界面。

關鍵詞：AC-DC；功率因數；相位

Abstract: The system is base on UCC28019 which is an active power factor connection chip and MCU AT90C516, in order to design single-phase AC-DC conversion circuit. The system has six modules including a transformer module、PFC module、an overcurrent protection and alarm module、a phase measuring module 、a MCU module which is used to measure and display and an auxiliary supply power module. The transformer module is consisted of an autotransformer and an isolation transformer, it can output a volage ranged from 20V to 30V. The PFC module is based on UCC28019, it is able to output 36V and maximum current 2.5A. The overcurrent protection module collect output current 2.5A, when the current is over2.5A, the MCU will control the relay to cut off the power, the alarm circuit will give a hint at the same time. The phase measuring module collect input volage and input current, after zero-cross detection and A/D conversion. The AT90C516 will display the results. The auxiliary supply power module is used to providing volage to the chips. According to the measurement, the input power is 37.5W,the output power is 30W,the efficiency is 80%,the PFC is 0.98, it complete the indexes perfectly, and has a good man-machine interface.

Keyword: AC-DC; PFC; phase;

目錄

一． 2

1．PFC校正電路2

2．相位測量電路3

3．過流保護3

二．理論分析與計算4

1．PFC控制電路的參數計算4

2．相位測量電路的參數計算5

三．電路與程序設計5

1．硬件電路設計5

2．軟件設計8

四．測量方案與測試結果9

1．功率因數測量的方案9

2．測量儀器及測量方法10

3．測量數據11

五、總結13

六、 參考文獻13

附錄14

一、設計任務14

1、任務

總結

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