基于输出电压上翘特性的串-并型组合变换器无互联均压控制策略

Input Voltage Sharing Control Strategy for ISOP Converter without Interconnection Based on Positive Output Voltage Gradient Method

输入串联输出并联(ISOP)组合变换器十分适用于高输入电压、低电压与大电流输出应用场合。要保证该组合变换器正常工作,就必须保证各模块输入电压均压与输出电流均流。现有的均压/均流控制策略都有模块化程度不高或可靠性较低等问题。为此,本文提出了一种基于输出电压上翘特性的ISOP组合变换器无互联均压控制策略,该控制策略可有效地提高ISOP组合变换器的模块化程度高和可靠性。本文首先介绍该控制策略的工作原理,分析其输入均压特性以及输出电压调整特性,然后分析了ISOP组合变换器采用该控制策略的稳定性,最后进行实验验证。

Input-series and output-parallel（ISOP） converter is very suitable for high input-voltage, low output-voltage and high output-current applications. Input voltage sharing and output current sharing of the constituent modules among the ISOP converter must be ensured. The existing input voltage sharing control strategies have the drawbacks of lower reliability and modularity. An input voltage sharing control strategy for ISOP converter without interconnection based on positive output voltage gradient method, which can effectively improve the reliability and modularity of ISOP converter. Firstly the operation principle of the proposed control strategy is introduced, and the input voltage sharing performance and output voltage regulation characteristics are analyzed. The stability of the proposed control strategy is also analyzed. The experimental results are presented at last.