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Vol.2 , No. 3, Publication Date: Aug. 31, 2015, Page: 37-48
 is proposed in this paper. Control principle analysis and comparison on accuracy, efficiency and cost between the three different solutions are given in this paper for brief summarizing AC-DC converter with constant current output CMOS IC design based on discontinuous conduction mode (DCM) fly-back topology.&picture=http://www.aascit.org/aascit/decorators/img/journal/915.jpg)
| [1] | Pengcheng Xu, Department of Electronic Science and Technology, Tongji University, Shanghai, China. |
| [2] | Zhigang Han, Department of Electronic Science and Technology, Tongji University, Shanghai, China. |
Fly-back topology is widely used in AC-DC converter design for its many irreplaceable outstanding characteristics over the other isolated topologies. In the previous AC-DC converter solution, usually, an opto-coupler is added on secondary feedback circuitry for transforming the output signal into light and then achieving feedback control without directly connected to primary-side circuitry. If taking the system cost and PCB volume into consideration, it is better to replace the expensive opto-coupler with a transformer which has another auxiliary winding for detecting output signal except primary and secondary winding. Unfortunately, the forward-biasing voltage drop on the essential rectifier diode and power lost on auxiliary winding make the foregoing auxiliary winding solution with lower accuracy and efficiency. For a balance between cost and accuracy, an AC-DC converter with zero-cross detection (ZCD) is proposed in this paper. Control principle analysis and comparison on accuracy, efficiency and cost between the three different solutions are given in this paper for brief summarizing AC-DC converter with constant current output CMOS IC design based on discontinuous conduction mode (DCM) fly-back topology.
Keywords
AC-DC, Fly-Back Topology, Opto-Coupler, Auxiliary Winding, Zero-Cross Detection
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