基于耦合電感的高增益Zeta式DC-DC變換器的研究
[Abstract]:With the depletion of fossil energy, green clean energy, such as solar energy and fuel cell, has been widely developed and applied. Solar energy has become one of the mainstream of new energy utilization due to its advantages of non-pollution, wide distribution and various applications. However, because of the low output voltage of photovoltaic modules, It is necessary for DC / DC converters with high voltage gain to raise it to a higher voltage level to meet the requirements of grid-connected power generation or electrical equipment. Therefore, it is of great significance to study new high gain and high efficiency DC-DC converters. Firstly, based on the traditional Zeta converter, according to the requirements of the high gain DC-DC converter, the Zeta converter is combined with the coupling inductor technology and the voltage multiplier structure. A high gain Zeta boost converter (CB-Zeta) based on coupling inductance is proposed. This converter has the advantages of high boost ratio, recovery of leakage inductance energy and suppression of diode reverse problem. The working principle and steady-state performance of the proposed converter are analyzed in detail, and the correctness of the theoretical analysis is verified by Matlab software simulation. Secondly, Zeta boost converter (CBDV-Zeta) based on coupling inductance and double voltage doubling unit is proposed by introducing double voltage clamp circuit. The double voltage clamp circuit is integrated into the original edge of the coupling inductor. The two voltage-doubling clamping capacitors are in the state of parallel charging when the main switch is off, which can absorb the leakage inductance energy simultaneously and reduce the current stress of the corresponding diode. When the main switch is turned on, two voltage-doubling clamped capacitors are discharged in series, so its boost capacity is further improved. The principle of the operation and the steady-state analysis are simulated and verified by Matlab simulation software. The small signal model of CBDV-Zeta converter is built by using state space averaging method. On this basis, the closed-loop compensation network of the converter is designed, and a prototype of the principle is built with TMS320F2812 as the core controller. Simulation and experimental results verify the correctness of the theoretical analysis.
【學(xué)位授予單位】:安徽工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM46
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