ﻃﺮاﺣﯽ ﯾﮏ ﻣﺒﺪل ﺑﺴﯿﺎر اﻓﺰاﯾﻨﺪه DC-DC ﻣﺒﺘﻨﯽ ﺑﺮ ﺷﺒﮑﻪ ﺷﺒﻪ اﻣﭙﺪاﻧﺲ ﺑﺎ ﺗﻨﺶ وﻟﺘﺎژ ﮐﻢ ﺑﺎ اﺳﺘﻔﺎده از ﺗﮑﻨﯿﮏ ﺳﻠﻒ ﮐﻮﭘﻞ ﺷﺪه

Design of a High Step-Up DC-DC Converter Based on QZSI with Low Voltage Stress by Using Coupled Inductor Technique

ﺳﺎﺧﺘﺎرﻫﺎي ﺑﺴﯿﺎر اﻓﺰاﯾﻨﺪه ﻋﻤﻮﻣﺎً ﺑﺮاي ارﺗﻘﺎء ﺳﻄﺢ وﻟﺘﺎژ ﭘﺎﯾﯿﻦ ﺗﻮﻟﯿﺪ ﺷﺪه ﺗﻮﺳﻂ ﻣﻨﺎﺑﻊ اﻧﺮژي ﺗﺠﺪﯾﺪﭘﺬﯾﺮ ﺑﻪﮐﺎر ﮔﺮﻓﺘﻪ ﻣﯽﺷﻮﻧﺪ. در اﯾﻦ ﻣﻘﺎﻟﻪ ﯾﮏ ﺳﺎﺧﺘﺎر ﺑﺴﯿﺎر اﻓﺰاﯾﻨﺪه ﻣﺒﺘﻨﯽ ﺑﺮ ﺷﺒﮑﻪ ﺷﺒﻪ اﻣﭙﺪاﻧﺲ اراﺋﻪ ﺷﺪه ﮐﻪ داراي ﺳﺎﺧﺘﺎري ﺳﺎده و در ﻋﯿﻦ ﺣﺎل ﮐﺎرﺑﺮدي ﻣﺘﺸﮑﻞ از دو ﺳﻠﻒ و ﺧﺎزن اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﺿﺮﯾﺐ وﻇﯿﻔﻪ ﮐﻤﺘﺮ 50 درﺻﺪ ﺑﺮاي اﯾﻦ ﻣﺒﺪل ﻣﺸﮑﻼت ﺑﺎزﯾﺎﺑﯽ ﻣﻌﮑﻮس دﯾﻮدﻫﺎ ﺑﺮﻃﺮف ﻣﯽﮔﺮدد. از ﻃﺮﻓﯽ زﻣﯿﻦ ﻣﺸﺘﺮك ﮐﻠﯿﺪ ﻗﺪرت و ﻣﻨﺒﻊ ورودي ﺑﺎﻋﺚ ﺳﺎدﮔﯽ ﻣﺪار ﮐﻨﺘﺮل ﻣﯽﺷﻮد. ﺑﺎ ﺑﻬﺮهﮔﯿﺮي از ﺗﮑﻨﯿﮏ ﺳﻠﻒ ﮐﻮﭘﻞ ﺷﺪه و ﻫﻤﭽﻨﯿﻦ ﺳﻠﻮل ﭼﻨﺪ ﺑﺮاﺑﺮ ﮐﻨﻨﺪه وﻟﺘﺎژ، ﺑﻬﺮه وﻟﺘﺎژ ﻣﺒﺪل ﺑﻪ ﻣﻘﺪار ﭼﺸﻢﮔﯿﺮي اﻓﺰاﯾﺶ ﻣﯽﯾﺎﺑﺪ. ﻋﻼوه ﺑﺮ آن در ﺟﻬﺖ ﻣﺤﺪودﮐﺮدن ﺗﻨﺶ وﻟﺘﺎژ روي ﮐﻠﯿﺪ، از ﺧﺎزن اﺳﺘﮏ ﺷﺪه اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. اﺳﺘﻔﺎده از ﺳﺎﺧﺘﺎر ﭘﯿﺸﻨﻬﺎدي ﺑﺎﻋﺚ اﻓﺰاﯾﺶ ﺑﻬﺮه وﻟﺘﺎژ ﻣﺒﺪل ﻣﯽﮔﺮدد. ﻫﻤﭽﻨﯿﻦ ﺳﺎﺧﺘﺎر اراﺋﻪ ﺷﺪه ﺳﻄﺢ ﺗﻨﺶ وﻟﺘﺎژ روي ﻧﯿﻤﻪ ﻫﺎديﻫﺎي ﻣﺪار را ﮐﺎﻫﺶ ﻣﯽدﻫﺪ ﮐﻪ ﺑﺎﻋﺚ ﮐﺎﻫﺶ ﻫﺰﯾﻨﻪ و اﻓﺰاﯾﺶ راﻧﺪﻣﺎن ﻣﺪار ﻣﯽﮔﺮدد. ﻣﺒﺪل ﻃﺮاﺣﯽ ﺷﺪه ﺑﺎ وﻟﺘﺎژ ورودي 25 وﻟﺖ و وﻟﺘﺎژ ﺧﺮوﺟﯽ400 وﻟﺖ و ﺗﻮان 100 وات در ﻧﺮماﻓﺰار اﺳﭙﺎﯾﺲ ﺷﺒﯿﻪﺳﺎزي ﺷﺪه و ﻧﺘﺎﯾﺞ ﻧﺸﺎن داده ﺷﺪه اﺳﺖ.

High step-up structures are commonly used to upgrade the low voltage levels generated by renewable energy sources. In this paper, a high step-up structure based on Quasi Z-Source network is presented, which has a simple yet functional structure consisting of two inductors and two capacitors. Due to the lower duty cycle of 50% for this converter, the problems of reverse recovery of diodes are solved. In addition, the common ground of the power switch and the input source simplifies the control circuit. Using the coupled inductor technique as well as the voltage multiplier cell, the converter voltage gains increases significantly. In addition, the stacked capacitor is used to limit the voltage stress on the switch. The use of the proposed structure increases the voltage gain of the converter. The proposed structure also reduces the level of voltage stress on the semiconductors of the circuit, which reduces the cost and increases the efficiency of the circuit. The converter designed with input voltage 25V and output voltage 400V and power 100W is simulated in PSpice software and the results are presented in the article.