矿用本安电源Buck变换器设计与仿真

Design and simulation on buck converter of mine intrinsic safe power

针对煤矿井下封闭、可燃性气体多、矿用本安电源须稳定运行的特点,对矿用本安电源变换器进行设计。根据最大输出纹波电压和本安判据的要求,分析了Buck变换器的工作原理,确定了电路中电容和电感参数的范围,提出了本安电源Buck变换器闭环控制方法,实现了Buck变换器的闭环仿真,改进了实际电路的设计调试方案。为验证结论的可靠性,利用MATLAB软件进行仿真,仿真结果表明:当电感选用0.1 m H,电容选用500μF时,Buck变换器可以稳定运行。使用闭环控制方法后,系统传递函数的穿越频率为9.96 k Hz,相角裕度为58.5°,与未使用闭环控制方法之前相比,Buck变换器能够有效降低输出纹波电压,保持输出电压恒定,证实了本安电源Buck变换器闭环控制的可行性。

According to many closed and combustible gases and the features of the mine intrinsic safe power to be stably operated, a study and design was conducted on the mine intrinsic safe power converter. According to the max output ripple voltage and the intrinsic safe criterion requirements, the paper analyzed the working principle of the Buck converter, determined the scope of the capacitance and inductance parameters in the circuit and researched and developed the closed-loop control method of the Buck converter applied in the intrinsic safe power. The closed-loop simulation of the Buck converter was realized and the design debugging scheme of the actual circuit was improved. In order to verify the reliability of the conclusion, the MATLAB software was applied to the simulation and the simulation results showed that when the inductance was 0.1mH selected and the capacitance was 500μF selected, the Buck converter could be stably run. After the application of the closed loop control method, the crossover frequency of the system transmission function was 9.96 kHz and the phase margin was 58.5% In comparison with before closed loop control method applied, the Buck converter could effectively reduce the output of the ripple voltage and could keep the output voltage in constant. The control feasibility of the Buck converter was verified.