Complementary Concentrating Solar LED Lighting Device and Its Application in Architectural Design

Abstract

The shortcomings of solar LED lighting concentrators and divide and conquer power module are analyzed, and a new set of solar LED lighting devices is proposed. From the aspect of concentrating solar energy, the device redesigns the structure of the existing symmetrical inner wall lens composite parabolic concentrator (SLCPC) by comprehensively using the principles of solar photovoltaic power generation and light transmission lighting. With the assistance of an optimized coating strategy, a part of the incident solar energy is introduced into the indoor lighting (TSLCPC) to realize energy complementary without affecting the optical performance of SLCPC. Meanwhile, it adopts a bidirectional synchronous rectifier DC-DC converter with Buck-Boost as the main topology. The lighting device takes single-chip microcomputer PIC16F887 as the main control chip, which has high-performance and low power consumption. A bidirectional synchronous rectifier DC-DC converter is adopted to realize MPPT control and LED drive. The hardware design of the device is also given. In the test, although the waveform of the bidirectional DC-DC converter has some burr in forward and reverse operation, the measurement accuracy remains stable, which verifies the feasibility of the device circuit. TSLCPC has the same optical efficiency as SLCPC, and it uses escape light to improve the utilization of solar energy. The effective light-receiving angle of TSLCPC and SLCPC ranges from −30° to 30°. When the system is introduced into the buildings in Hefei, it is found that the installation angle exerts a significant impact on lighting performance of TSLCPC, and then affects the lighting performance to a certain extent. However, it is generally acceptable.