In order to improve the performance of a solar simulator to measure the characteristic parameters of solar cells more accurately, how to control the radiation parameters for the simulator lamp was studied, such as the radiation utility rate, radiation uniformity,radiation intension,radiation stability, and so on. A coaxial optical system was selected as the optical system of the solar simulator. Then, the utility rate the lamp radiation and radiation uniformity were improved by ameliorating the optical system structure layout and increasing an optical integrator. On the basis of analyzing the existing control circuit of the simulator, an optical feedback technology was adopted to redesign the control circuit and to improve the control ability on radiation intension and radiation stability. The experimental results indicate that the new solar simulator can effectively control radiation intension and stability. When the standard light intension is 1000 W/m2, the radiation uniformity is 2.5% and the radiation stability is less than 1% in a diameter of 250 mm,which has greatly improved the performance of the solar simulator.%为了提高太阳模拟器的性能,更准确地测试太阳电池的特性参数,对模拟器的光源辐照利用率、辐照均匀度、辐照度与辐照稳定性的控制进行了研究.选取同轴光学系统结构作为模拟器光学系统,通过改进光学系统的结构排布,增加光积分器等方法,改善光源辐照利用率与辐照均匀度;在分析现役模拟器控制线路的基础上,采用光反馈技术对控制线路进行重新设计,提升系统对辐照度与辐照稳定性的可控性.实验结果表明:新型的太阳模拟器能有效地控制辐照度与辐照稳定性,在直径250 mm范围内,标准光强为1000 W/m2的条件下,辐照均匀度为2.5%,辐照稳定性＜1%,较大地改进了太阳模拟器的性能.
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